Liquidsoap scripting language reference

The Source / … categories contain all functions that return sources. The Input functions are those which build elementary sources (playing files, synthesizing sound, etc.). The Output functions are those which take a source and register it for being streamed to the outside (file, soundcard, audio server, etc.). The Visualization functions are experimental ones that let you visualize in real-time some aspects of the audio stream. The Sound Processing functions are those which basically work on the source as a continuous audio stream. They would typically be mixers of streams, audio effects or analysis. Finally, Track Processing functions are basically all others, often having a behaviour that depends on or affects the extra information that liquidsoap puts in streams: track limits and metadata.

Source / Conversions
Source / Input
Source / Liquidsoap
Source / MIDI Processing
Source / Output
Source / Sound Processing
Source / Sound Synthesis
Source / Track Processing
Source / Video Processing
Source / Visualization
FFmpeg Filter
Bool
Control
Interaction
Liquidsoap
List
Math
Pair
String
System

Bool

`!=`

Comparison of comparable values.

Type:

('a, 'a) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`<`

Comparison of comparable values.

Type:

('a, 'a) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`<=`

Comparison of comparable values.

Type:

('a, 'a) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`==`

Comparison of comparable values.

Type:

('a, 'a) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`>`

Comparison of comparable values.

Type:

('a, 'a) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`>=`

Comparison of comparable values.

Type:

('a, 'a) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`and`

Return the conjunction of its arguments

Type:

({bool}, {bool}) -> bool

Arguments:

(unlabeled) (of type {bool})
(unlabeled) (of type {bool})

`not`

Returns the negation of its argument.

Type:

(bool) -> bool

Arguments:

(unlabeled) (of type bool)

`or`

Return the disjunction of its arguments

Type:

({bool}, {bool}) -> bool

Arguments:

(unlabeled) (of type {bool})
(unlabeled) (of type {bool})

`random.bool`

Generate a random boolean.

Type:

() -> bool

Arguments:

Control

`ignore`

Convert anything to unit, preventing warnings.

Type:

('a) -> unit

Arguments:

(unlabeled) (of type 'a)

`thread.run`

Run a function in a separate thread.

Type:

(?fast : bool, ?delay : float, ?every : {float}?,
 (() -> unit)) -> unit

Arguments:

fast (of type bool, which defaults to true): Whether the thread is supposed to return quickly or not. Typically, blocking tasks (e.g. fetching data over the internet) should not be considered to be fast. When set to false its priority will be lowered below that of request resolutions and fast timeouts. This is only effective if you set a dedicated queue for fast tasks, see the “scheduler” settings for more details.
delay (of type float, which defaults to 0.): Delay (in seconds) after which the thread should be launched.
every (of type {float}?, which defaults to null): How often (in seconds) the thread should be run. If negative or null, run once.
(unlabeled) (of type () -> unit): Function to execute.

File

`file.contents`

Read the whole contents of a file.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`file.digest`

Return an MD5 digest for the given file.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`file.download`

Download file using a regular http.get request. Returns true on success.

Type:

(filename : string, ?timeout : float, string) -> bool

Arguments:

filename (of type string): Downloaded filename.
timeout (of type float, which defaults to 5.): Timeout in seconds
(unlabeled) (of type string)

`file.exists`

Returns true if the file or directory exists.

Type:

(string) -> bool

Arguments:

(unlabeled) (of type string)

`file.extension`

Returns a file’s extension.

Type:

(?dir_sep : string, ?leading_dot : bool, string) ->
string

Arguments:

dir_sep (of type string, which defaults to "/"): Directory separator.
leading_dot (of type bool, which defaults to true): Return extension with a leading dot, e.g. .foo.
(unlabeled) (of type string)

`file.getter`

Getter to the contents of a file.

Type:

(string) -> () -> string

Arguments:

(unlabeled) (of type string): Name of the file from which the contents should be taken.

`file.getter.float`

Float getter from a file.

Type:

(?default : float, string) -> {float}

Arguments:

default (of type float, which defaults to 0.): Default value when the file contains invalid data.
(unlabeled) (of type string): Name of the file from which the contents should be taken.

`file.is_directory`

Returns true if the file exists and is a directory.

Type:

(string) -> bool

Arguments:

(unlabeled) (of type string)

`file.iterator`

Iterate over the contents of a file.

Type:

(string) -> () -> string?

Arguments:

(unlabeled) (of type string)

`file.lines`

Get the list of lines of a file.

Type:

(string) -> [string]

Arguments:

(unlabeled) (of type string)

`file.lines.iterator`

Iterate over the lines of a file.

Type:

(string) -> () -> string?

Arguments:

(unlabeled) (of type string)

`file.ls`

List all the files in a directory.

Type:

(?absolute : bool, ?recursive : bool, ?pattern : string?,
 string) -> [string]

Arguments:

absolute (of type bool, which defaults to false): Whether to return absolute paths.
recursive (of type bool, which defaults to false): Whether to look recursively in subdirectories.
pattern (of type string?, which defaults to null): Pattern that the filenames should match (e.g. "*.mp3").
(unlabeled) (of type string): Directory to look in.

`file.metadata`

Read metadata from a file.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.ffmpeg`

Read metadata from a file using the ffmpeg decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.flac`

Read metadata from a file using the flac decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.id3`

Read metadata from a file using the id3 decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.id3v1`

Read metadata from a file using the id3v1 decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.id3v2`

Read metadata from a file using the id3v2 decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.imagemd`

Read metadata from a file using the imagemd decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.mp4`

Read metadata from a file using the mp4 decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.ogg`

Read metadata from a file using the ogg decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.taglib`

Read metadata from a file using the taglib decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.metadata.videomd`

Read metadata from a file using the videomd decoder.

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): File from which the metadata should be read.

`file.mime`

Get the MIME type of a file, according to libmagic.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`file.mime_default`

Alias of file.mime (because it is available)

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`file.mkdir`

Create a directory.

Type:

(?perms : int, string) -> unit

Arguments:

perms (of type int, which defaults to 493): Default file rights if created (default is 0o755).
(unlabeled) (of type string)

`file.open`

Open a file.

Type:

(?write : bool, ?create : bool?, ?append : bool,
 ?non_blocking : bool, ?perms : int, string) -> socket

Arguments:

write (of type bool, which defaults to false): Open file for writing
create (of type bool?, which defaults to null): Create if nonexistent. Default: false in read-only mode, true when writing.
append (of type bool, which defaults to false): Append data if file exists.
non_blocking (of type bool, which defaults to false): Open in non-blocking mode.
perms (of type int, which defaults to 420): Default file rights if created. Default: 0o644
(unlabeled) (of type string)

Methods:

close (of type () -> unit): Close the socket.
read (of type () -> string): Read data from a socket. Reading is done when the function returns an empty srring "".
write (of type (string) -> unit): Write data to a socket

`file.read`

Read the content of a file. Returns a function of type ()->string. File is done reading when function returns the empty string "".

Type:

(string) -> () -> string

Arguments:

(unlabeled) (of type string)

`file.remove`

Remove a file.

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`file.rmdir`

Remove a directory and its content.

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`file.size`

File size in bytes.

Type:

(string) -> int

Arguments:

(unlabeled) (of type string)

`file.temp`

Return a fresh temporary filename. The temporary file is created empty, with permissions 0o600 (readable and writable only by the file owner).

Type:

(string, string) -> string

Arguments:

(unlabeled) (of type string): File prefix
(unlabeled) (of type string): File suffix

`file.temp_dir`

Return a fresh temporary directory name. The temporary directory is created empty, with permissions 0o700 (readable, writable and listable only by the file owner).

Type:

(string, string) -> string

Arguments:

(unlabeled) (of type string): Directory prefix
(unlabeled) (of type string): Directory suffix

`file.watch`

Call a function when a file is modified. Returns unwatch function in unwatch method.

Type:

(string, (() -> unit)) -> unit

Arguments:

(unlabeled) (of type string): File to watch.
(unlabeled) (of type () -> unit): Handler function.

Methods:

unwatch (of type () -> unit): Function to remove the watch on the file.

`file.which`

file.which("progname") looks for an executable named “progname” using directories from the PATH environment variable and returns “” if it could not find one.

Type:

(string) -> string?

Arguments:

(unlabeled) (of type string)

`file.write`

Write data to a file.

Type:

(data : {string?}, ?perms : int, ?append : bool, string) ->
unit

Arguments:

data (of type {string?}): Data to write. If passing a callback () -> string?, the callback must return null or "" when it has finished sending all its data.
perms (of type int, which defaults to 420): Default file rights if created. Default: 0o644.
append (of type bool, which defaults to false): Append data if file exists.
(unlabeled) (of type string): Path to write to

`file.write.stream`

Stream data to a file. Returns a callback to write to the file. Execute with null or "" to signify the end of the writing operation.

Type:

(?perms : int, ?append : bool, string) ->
(string?) -> unit

Arguments:

perms (of type int, which defaults to 420): Default file rights if created. Default: 0o644.
append (of type bool, which defaults to false): Append data if file exists.
(unlabeled) (of type string): Path to write to

`get_mime`

Generic mime test. First try to use file.mime if it exist. Otherwise try to get the value using the file binary. Returns “” (empty string) if no value can be found.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string): The file to test

`path.basename`

Get the base name of a path.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`path.concat`

Concatenate two paths, using the appropriate directory separator.

Type:

(string, string) -> string

Arguments:

(unlabeled) (of type string)
(unlabeled) (of type string)

`path.dirname`

Get the directory name of a path.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`path.home.unrelate`

Expand path that start with ‘~’ with the current home directory.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`path.remove_extension`

Remove the file extension from a path.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`string.apic.parse`

Parse APIC ID3v2 tags (such as those obtained in the APIC tag from file.metadata.id3v2). The returned values are: mime, picture type, description, and picture data.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string): APIC data.

Methods:

description (of type string): Description
mime (of type string): Mime type
picture_type (of type int): Picture type

Filter

`ffmpeg.filter.audio.input`

Attach an audio source to a filter’s input

Type:

(?pass_metadata : bool, ffmpeg.filter.graph,
 source(audio=ffmpeg.audio.raw('a), video=none,
 midi=none)) -> ffmpeg.filter.audio

Arguments:

pass_metadata (of type bool, which defaults to true): Pass liquidsoap’s metadata to this stream
(unlabeled) (of type ffmpeg.filter.graph)
(unlabeled) (of type source(audio=ffmpeg.audio.raw('a), video=none, midi=none))

`ffmpeg.filter.create`

Configure and launch a filter graph

Type:

(((ffmpeg.filter.graph) -> 'a)) -> 'a

Arguments:

(unlabeled) (of type (ffmpeg.filter.graph) -> 'a)

`ffmpeg.filter.video.input`

Attach a video source to a filter’s input

Type:

(?pass_metadata : bool, ffmpeg.filter.graph,
 source(audio=none, video=ffmpeg.video.raw('a),
 midi=none)) -> ffmpeg.filter.video

Arguments:

pass_metadata (of type bool, which defaults to false): Pass liquidsoap’s metadata to this stream
(unlabeled) (of type ffmpeg.filter.graph)
(unlabeled) (of type source(audio=none, video=ffmpeg.video.raw('a), midi=none))

Input

`input`

Input an audio stream using the default operator.

Type:

(?id : string?, ?start : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?fallible : bool) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be (temporarily) stopped.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Interaction

`audioscrobbler.nowplaying`

Submit a now playing song using the audioscrobbler protocol.

Type:

(user : string, password : string, ?host : string,
 ?port : int, ?length : bool, [string * string]) -> unit

Arguments:

user (of type string)
password (of type string)
host (of type string, which defaults to "post.audioscrobbler.com"): Host for audioscrobbling submissions.
port (of type int, which defaults to 80): Port for audioscrobbling submissions.
length (of type bool, which defaults to false): Try to submit length information. This operation can be CPU intensive. Value forced to true when used with the “user” source type.
(unlabeled) (of type [string * string])

`audioscrobbler.submit`

Submit a played song using the audioscrobbler protocol.

Type:

(?source : string, user : string, password : string,
 ?host : string, ?port : int, ?length : bool,
 [string * string]) -> unit

Arguments:

source (of type string, which defaults to "broadcast"): Source for tracks. Should be one of: “broadcast”, “user”, “recommendation” or “unknown”. Since liquidsoap is intended for radio broadcasting, this is the default. Sources other than user don’t need duration to be set.
user (of type string)
password (of type string)
host (of type string, which defaults to "post.audioscrobbler.com"): Host for audioscrobbling submissions.
port (of type int, which defaults to 80): Port for audioscrobbling submissions.
length (of type bool, which defaults to false): Try to submit length information. This operation can be CPU intensive. Value forced to true when used with the “user” source type.
(unlabeled) (of type [string * string])

`compress.multiband.interactive`

Create a multiband compressor whose parameters are interactive variables.

Type:

(?id : string, ?bands : int, source(audio=pcm('a),
 video=internal('b), midi=internal('c))) ->
source(audio=pcm('a), video=internal('b),
midi=internal('c))

Arguments:

id (of type string, which defaults to "compress"): Id of the source. Variable names are prefixed with this.
bands (of type int, which defaults to 5): Number of bands.
(unlabeled) (of type source(audio=pcm('a), video=internal('b), midi=internal('c))): Source to compress.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gain (of type () -> float): Gain (dB).
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): RMS or peak power (linear).
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`harbor.http.static`

Serve a static path.

Type:

(?port : int, ?path : string, ?browse : bool,
 ?content_type : ((string) -> string),
 ?headers : [string * string], string) -> unit

Arguments:

port (of type int, which defaults to 8000): Port for incoming harbor (http) connections.
path (of type string, which defaults to "/"): Base path.
browse (of type bool, which defaults to false): List files in directories.
content_type (of type (string) -> string, which defaults to <fun>): Callback to specify Content-Type on a per file basis. Default: file.mime if compiled or file CLI if present.
headers (of type [string * string], which defaults to [("Access-Control-Allow-Origin", "*")]): Default response headers.
(unlabeled) (of type string): Local path to be served.

`harbor.https.static`

Serve a static path.

Type:

(?port : int, ?path : string, ?browse : bool,
 ?content_type : ((string) -> string),
 ?headers : [string * string], string) -> unit

Arguments:

port (of type int, which defaults to 8000): Port for incoming harbor (https) connections.
path (of type string, which defaults to "/"): Base path.
browse (of type bool, which defaults to false): List files in directories.
content_type (of type (string) -> string, which defaults to <fun>): Callback to specify Content-Type on a per file basis. Default: file.mime if compiled or file CLI if present.
headers (of type [string * string], which defaults to [("Access-Control-Allow-Origin", "*")]): Default response headers.
(unlabeled) (of type string): Local path to be served.

`http.delete`

Perform a full Http DELETE request.

Type:

(?headers : [string * string], ?http_version : string?,
 ?redirect : bool, ?timeout_ms : int?, string) -> unit

Arguments:

headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.delete.stream`

Perform a full Http DELETE request.

Type:

(?headers : [string * string], ?http_version : string?,
 ?redirect : bool, ?timeout_ms : int?, string,
 on_body_data : ((string?) -> unit)) -> unit

Arguments:

headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.
on_body_data (of type (string?) -> unit): function called when receiving response body data. null or "" means that all the data has been passed.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.get`

Perform a full Http GET request.

Type:

(?headers : [string * string], ?http_version : string?,
 ?redirect : bool, ?timeout_ms : int?, string) -> string

Arguments:

headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.get.stream`

Perform a full Http GET request.

Type:

(?headers : [string * string], ?http_version : string?,
 ?redirect : bool, ?timeout_ms : int?, string,
 on_body_data : ((string?) -> unit)) -> unit

Arguments:

headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.
on_body_data (of type (string?) -> unit): function called when receiving response body data. null or "" means that all the data has been passed.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.head`

Perform a full Http HEAD request.

Type:

(?headers : [string * string], ?http_version : string?,
 ?redirect : bool, ?timeout_ms : int?, string) -> unit

Arguments:

headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.head.stream`

Perform a full Http HEAD request.

Type:

(?headers : [string * string], ?http_version : string?,
 ?redirect : bool, ?timeout_ms : int?, string,
 on_body_data : ((string?) -> unit)) -> unit

Arguments:

headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.
on_body_data (of type (string?) -> unit): function called when receiving response body data. null or "" means that all the data has been passed.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.post`

Perform a full Http POST request`.

Type:

(?data : {string?}, ?headers : [string * string],
 ?http_version : string?, ?redirect : bool,
 ?timeout_ms : int?, string) -> string

Arguments:

data (of type {string?}, which defaults to ""): POST data. Use a string? getter to stream data and return null when all data has been passed.
headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.post.stream`

Perform a full Http POST request`.

Type:

(?data : {string?}, ?headers : [string * string],
 ?http_version : string?, ?redirect : bool,
 ?timeout_ms : int?, string,
 on_body_data : ((string?) -> unit)) -> unit

Arguments:

data (of type {string?}, which defaults to ""): POST data. Use a string? getter to stream data and return null when all data has been passed.
headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.
on_body_data (of type (string?) -> unit): function called when receiving response body data. null or "" means that all the data has been passed.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.put`

Perform a full Http PUT request.

Type:

(?data : {string?}, ?headers : [string * string],
 ?http_version : string?, ?redirect : bool,
 ?timeout_ms : int?, string) -> string

Arguments:

data (of type {string?}, which defaults to ""): POST data. Use a string? getter to stream data and return null when all data has been passed.
headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.put.stream`

Perform a full Http PUT request.

Type:

(?data : {string?}, ?headers : [string * string],
 ?http_version : string?, ?redirect : bool,
 ?timeout_ms : int?, string,
 on_body_data : ((string?) -> unit)) -> unit

Arguments:

data (of type {string?}, which defaults to ""): POST data. Use a string? getter to stream data and return null when all data has been passed.
headers (of type [string * string], which defaults to []): Additional headers.
http_version (of type string?, which defaults to null): Http request version.
redirect (of type bool, which defaults to true): Perform redirections if needed.
timeout_ms (of type int?, which defaults to 10000): Timeout for network operations in milliseconds.
(unlabeled) (of type string): Requested URL, e.g. “http://www.google.com/”.
on_body_data (of type (string?) -> unit): function called when receiving response body data. null or "" means that all the data has been passed.

Methods:

headers (of type [string * string]): HTTP headers.
protocol_version (of type string): Version of the HTTP protocol.
status_code (of type int): Status code.
status_message (of type string): Status message.

`http.response`

Create a HTTP response string.

Type:

(?protocol : string, ?code : int,
 ?headers : [string * string], ?content_type : string,
 ?data : string) -> () -> string

Arguments:

protocol (of type string, which defaults to "HTTP/1.1"): HTTP protocol used.
code (of type int, which defaults to 200): Response code.
headers (of type [string * string], which defaults to []): Response headers.
content_type (of type string, which defaults to ""): Content type for the data.
data (of type string, which defaults to ""): Response data.

`http.response.stream`

Create a streamed HTTP response.

Type:

(?protocol : string, ?code : int,
 ?headers : [string * string], ?content_type : string,
 data_len : 'a, data : (() -> string)) -> () -> string

Arguments:

protocol (of type string, which defaults to "HTTP/1.1"): HTTP protocol used.
code (of type int, which defaults to 200): Response code.
headers (of type [string * string], which defaults to []): Response headers.
content_type (of type string, which defaults to ""): Content type for the data.
data_len (of type 'a): Response length in bytes.
data (of type () -> string): Response data.

`icy.update_metadata`

Update metata on an icecast mountpoint using the ICY protocol.

Type:

(?host : string, ?port : int, ?user : string,
 ?password : string, ?mount : string, ?icy_id : int,
 ?protocol : string, ?encoding : string?,
 ?headers : [string * string], [string * string]) -> unit

Arguments:

host (of type string, which defaults to "localhost")
port (of type int, which defaults to 8000)
user (of type string, which defaults to "source")
password (of type string, which defaults to "hackme")
mount (of type string, which defaults to ""): Source mount point. Mandatory when streaming to icecast.
icy_id (of type int, which defaults to 1): Shoutcast source ID. Only supported by Shoutcast v2.
protocol (of type string, which defaults to "http"): Protocol to use. One of: “icy”, “http” or “https”
encoding (of type string?, which defaults to null): Encoding used to send metadata, default (UTF-8) if null.
headers (of type [string * string], which defaults to [("User-Agent", "Liquidsoap/2.1.0 (Unix; OCaml 4.14.0)")]): Additional headers.
(unlabeled) (of type [string * string])

`interactive.bool`

Read a boolean from an interactive input.

Type:

(?description : string, ?osc : string, string, bool) ->
() -> bool

Arguments:

description (of type string, which defaults to ""): Description of the variable.
osc (of type string, which defaults to ""): OSC address.
(unlabeled) (of type string): Name of the variable.
(unlabeled) (of type bool): Initial value.

Methods:

remove (of type () -> unit)
set (of type ('A) -> unit)

`interactive.float`

Read a float from an interactive input.

Type:

(?min : float, ?max : float, ?step : float,
 ?description : string, ?unit : string, ?osc : string,
 string, 'a) -> () -> 'a

Arguments:

min (of type float, which defaults to -inf): Minimal value.
max (of type float, which defaults to inf): Maximal value.
step (of type float, which defaults to 0.1): Typical variation of the value.
description (of type string, which defaults to ""): Description of the variable.
unit (of type string, which defaults to ""): Unit for the variable.
osc (of type string, which defaults to ""): OSC address.
(unlabeled) (of type string): Name of the variable.
(unlabeled) (of type 'a): Initial value.

Methods:

remove (of type () -> unit)
set (of type ('A) -> unit)

`interactive.harbor`

Expose interactive variables through habor http server.

Type:

(?port : int, ?uri : string) -> unit

Arguments:

port (of type int, which defaults to 8000): Port of the server.
uri (of type string, which defaults to "/interactive"): URI of the server.

`interactive.int`

Read an integer from an interactive input.

Type:

(?description : string, ?osc : string, string, 'a) ->
() -> 'a

Arguments:

description (of type string, which defaults to ""): Description of the variable.
osc (of type string, which defaults to ""): OSC address.
(unlabeled) (of type string): Name of the variable.
(unlabeled) (of type 'a): Initial value.

Methods:

remove (of type () -> unit)
set (of type ('A) -> unit)

`interactive.string`

Read a string from an interactive input.

Type:

(?description : string, ?osc : string, string, 'a) ->
() -> 'a

Arguments:

description (of type string, which defaults to ""): Description of the variable.
osc (of type string, which defaults to ""): OSC address.
(unlabeled) (of type string): Name of the variable.
(unlabeled) (of type 'a): Initial value.

Methods:

remove (of type () -> unit)
set (of type ('A) -> unit)

`metadata.getter`

Create a getter from a metadata: this is a string, whose value can be changed with a metadata.

Type:

(string, 'a, 'c
 .{on_metadata : (((['a * string]) -> unit)) -> 'b}) ->
() -> string where 'a is an orderable type

Arguments:

(unlabeled) (of type string): Initial value.
(unlabeled) (of type anything that is an orderable type): Metadata on which the value should be updated.
(unlabeled) (of type 'c.{on_metadata : (((['a * string]) -> unit)) -> 'b} where 'a is an orderable type): Source containing the metadata.

`metadata.getter.float`

Create a float getter from a metadata: this is a float, whose value can be changed with a metadata.

Type:

(float, 'a, 'c
 .{on_metadata : (((['a * string]) -> unit)) -> 'b}) ->
() -> float where 'a is an orderable type

Arguments:

(unlabeled) (of type float): Initial value.
(unlabeled) (of type anything that is an orderable type): Metadata on which the value should be updated.
(unlabeled) (of type 'c.{on_metadata : (((['a * string]) -> unit)) -> 'b} where 'a is an orderable type): Source containing the metadata.

`osc.bool`

Read from an OSC path.

Type:

(string, bool) -> () -> bool

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type bool): Initial value.

`osc.float`

Read from an OSC path.

Type:

(string, float) -> () -> float

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type float): Initial value.

`osc.float_pair`

Read from an OSC path.

Type:

(string, (float * float)) -> () -> float * float

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type float * float): Initial value.

`osc.int`

Read from an OSC path.

Type:

(string, int) -> () -> int

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type int): Initial value.

`osc.int_pair`

Read from an OSC path.

Type:

(string, (int * int)) -> () -> int * int

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type int * int): Initial value.

`osc.on_bool`

Type:

(string, ((bool) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type (bool) -> unit): Callback function.

`osc.on_float`

Type:

(string, ((float) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type (float) -> unit): Callback function.

`osc.on_float_pair`

Type:

(string, (((float * float)) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type ((float * float)) -> unit): Callback function.

`osc.on_int`

Type:

(string, ((int) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type (int) -> unit): Callback function.

`osc.on_int_pair`

Type:

(string, (((int * int)) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type ((int * int)) -> unit): Callback function.

`osc.on_string`

Type:

(string, ((string) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type (string) -> unit): Callback function.

`osc.on_string_pair`

Type:

(string, (((string * string)) -> unit)) -> unit

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type ((string * string)) -> unit): Callback function.

`osc.send_bool`

Send a value to an OSC client.

Type:

(host : string, port : int, string, bool) -> unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type bool): Value to send.

`osc.send_float`

Send a value to an OSC client.

Type:

(host : string, port : int, string, float) -> unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type float): Value to send.

`osc.send_float_pair`

Send a value to an OSC client.

Type:

(host : string, port : int, string, (float * float)) ->
unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type float * float): Value to send.

`osc.send_int`

Send a value to an OSC client.

Type:

(host : string, port : int, string, int) -> unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type int): Value to send.

`osc.send_int_pair`

Send a value to an OSC client.

Type:

(host : string, port : int, string, (int * int)) -> unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type int * int): Value to send.

`osc.send_string`

Send a value to an OSC client.

Type:

(host : string, port : int, string, string) -> unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type string): Value to send.

`osc.send_string_pair`

Send a value to an OSC client.

Type:

(host : string, port : int, string, (string * string)) ->
unit

Arguments:

host (of type string): OSC client address.
port (of type int): OSC client port.
(unlabeled) (of type string): OSC path.
(unlabeled) (of type string * string): Value to send.

`osc.string`

Read from an OSC path.

Type:

(string, string) -> () -> string

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type string): Initial value.

`osc.string_pair`

Read from an OSC path.

Type:

(string, (string * string)) -> () -> string * string

Arguments:

(unlabeled) (of type string): OSC path.
(unlabeled) (of type string * string): Initial value.

`print`

Print on standard output.

Type:

(?newline : bool, 'a) -> unit

Arguments:

newline (of type bool, which defaults to true): If true, a newline is added after displaying the value.
(unlabeled) (of type 'a)

`prometheus.counter`

Type:

(help : string, ?namespace : string, ?subsystem : string,
 labels : [string], string) ->
(label_values : [string]) -> (float) -> unit

Arguments:

help (of type string): Help of the metric
namespace (of type string, which defaults to ""): namespace of the metric
subsystem (of type string, which defaults to ""): subsystem of the metric
labels (of type [string]): labels for the metric
(unlabeled) (of type string): Name of the metric

`prometheus.gauge`

Type:

(help : string, ?namespace : string, ?subsystem : string,
 labels : [string], string) ->
(label_values : [string]) -> (float) -> unit

Arguments:

help (of type string): Help of the metric
namespace (of type string, which defaults to ""): namespace of the metric
subsystem (of type string, which defaults to ""): subsystem of the metric
labels (of type [string]): labels for the metric
(unlabeled) (of type string): Name of the metric

`prometheus.summary`

Type:

(help : string, ?namespace : string, ?subsystem : string,
 labels : [string], string) ->
(label_values : [string]) -> (float) -> unit

Arguments:

help (of type string): Help of the metric
namespace (of type string, which defaults to ""): namespace of the metric
subsystem (of type string, which defaults to ""): subsystem of the metric
labels (of type [string]): labels for the metric
(unlabeled) (of type string): Name of the metric

`server.broadcast`

Restart all server clients waiting on the given condition.

Type:

(('a * ('b * (() -> 'c)))) -> 'c

Arguments:

(unlabeled) (of type 'a * ('b * (() -> 'c))): condition

`server.register`

Type:

(?namespace : string?, ?description : string,
 ?usage : string?, string, ((string) -> string)) -> unit

Arguments:

namespace (of type string?, which defaults to null): Used to group multiple commands for the same functionality. If specified, the command will be named namespace.command.
description (of type string, which defaults to "No documentation available."): A description of your command.
usage (of type string?, which defaults to null): Description of how the command should be used.
(unlabeled) (of type string): Name of the command.
(unlabeled) (of type (string) -> string): Function called when the command is executed. It takes as argument the argument passed on the commandline and returns the message which will be printed on the commandline.

`server.signal`

Restart one server client waiting on the given condition.

Type:

(('a * ((() -> 'b) * 'c))) -> 'b

Arguments:

(unlabeled) (of type 'a * ((() -> 'b) * 'c)): condition

`server.telnet`

Enable telnet server.

Type:

(?port : int) -> unit

Arguments:

port (of type int, which defaults to 1234): Port on which we should listen.

Interactive

`interactive.load`

Load the value of interactive variables from a file.

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string): Name of the file.

`interactive.persistent`

Make the value of interactive variables persistent: they are loaded from the given file and stored there whenever updated. This function should be called after all interactive variables have been defined (variables not declared yet will not be loaded).

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string): Name of the file.

`interactive.save`

Save the value of all interactive variables in a file.

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string): Name of the file.

Liquidsoap

`add_decoder`

Register an external decoder. The encoder should output in WAV format to his standard output (stdout) and read data from its standard input (stdin).

Type:

(name : string, description : string, ?mimes : [string],
 ?file_extensions : [string], ?priority : int,
 test : ((string) -> int), string) -> unit

Arguments:

name (of type string): Format/decoder’s name.
description (of type string): Description of the decoder.
mimes (of type [string], which defaults to []): List of mime types supported by this decoder. Empty means any mime type should be accepted.
file_extensions (of type [string], which defaults to []): List of file extensions. Empty means any file extension should be accepted.
priority (of type int, which defaults to 1): Decoder priority
test (of type (string) -> int): Function used to determine if a file should be decoded by the decoder. Returned values are: 0: no decodable audio, -1: decodable audio but number of audio channels unknown, x: fixed number of decodable audio channels.
(unlabeled) (of type string): Process to start.

`add_metadata_resolver`

Type:

(string, ((string) -> [string * string])) -> unit

Arguments:

(unlabeled) (of type string): Format/resolver’s name.
(unlabeled) (of type (string) -> [string * string]): Process to start. The function takes the format and filename as argument and returns a list of (name,value) fields.

`add_oblivious_decoder`

Register an external file decoder. The encoder should output in WAV format to his standard output (stdout) and read data from the file it receives. The estimated remaining duration for this decoder will be unknown until the buffer last seconds of the file. If possible, it is recommended to decode from stdin and use add_decoder.

Type:

(name : string, description : string,
 test : ((string) -> int), ?priority : int,
 ?mimes : [string], ?file_extensions : [string],
 ?buffer : float, ((string) -> string)) -> unit

Arguments:

name (of type string): Format/decoder’s name.
description (of type string): Description of the decoder.
test (of type (string) -> int): Function used to determine if a file should be decoded by the decoder. Returned values are: 0: no decodable audio, -1: decodable audio but number of audio channels unknown, x: fixed number of decodable audio channels.
priority (of type int, which defaults to 1): Decoder priority
mimes (of type [string], which defaults to []): List of mime types supported by this decoder. Empty means any mime type should be accepted.
file_extensions (of type [string], which defaults to []): List of file extensions. Empty means any file extension should be accepted.
buffer (of type float, which defaults to 5.)
(unlabeled) (of type (string) -> string): Process to start. The function takes the filename as argument and returns the process to start.

`add_protocol`

Type:

(?temporary : bool, ?static : bool, ?syntax : string,
 ?doc : string, string,
 ((rlog : ((string) -> unit), maxtime : float, string) ->
  [string])) -> unit

Arguments:

temporary (of type bool, which defaults to false): if true, file is removed when it is finished.
static (of type bool, which defaults to false): if true, then requests can be resolved once and for all. Typically, static protocols can be used to create infallible sources.
syntax (of type string, which defaults to "Undocumented"): URI syntax.
doc (of type string, which defaults to "Undocumented"): Protocol documentation.
(unlabeled) (of type string): Protocol name. Resolver will be called on uris of the form: <protocol name>:....
(unlabeled) (of type (rlog : ((string) -> unit), maxtime : float, string) -> [string]): Protocol resolver. Receives a function to log protocol resolution, the <arg> in <protocol name>:<arg> and the max delay that resolution should take.

`assert`

Ensure that a condition is satisfied (raise error.assertion exception otherwise).

Type:

(bool) -> unit

Arguments:

(unlabeled) (of type bool): Condition which should be satisfied.

`audio.channels`

Channels for audio.

Type:

() -> int

Arguments:

`audio.samplerate`

Samplerate for audio.

Type:

() -> int

Arguments:

`clock`

Assign a new clock to the given source (and to other time-dependent sources) and return the source. It is a conveniency wrapper around clock.assign_new(), allowing more concise scripts in some cases.

Type:

(?sync : string, ?id : string?, source('a)) -> source('a)

Arguments:

sync (of type string, which defaults to "auto"): Synchronization mode. One of: "auto", "cpu", or "none". Defaults to "auto", which synchronizes with the CPU clock if none of the active sources are attached to their own clock (e.g. ALSA input, etc). "cpu" always synchronizes with the CPU clock. "none" removes all synchronization control.
id (of type string?, which defaults to null)
(unlabeled) (of type source('a))

`clock.assign_new`

Create a new clock and assign it to a list of sources.

Type:

(?id : string?, ?sync : string, [source('a)]) -> unit

Arguments:

id (of type string?, which defaults to null): Identifier for the new clock. The default empty string means that the identifier of the first source will be used.
sync (of type string, which defaults to "auto"): Synchronization mode. One of: "auto", "cpu", or "none". Defaults to "auto", which synchronizes with the CPU clock if none of the active sources are attached to their own clock (e.g. ALSA input, etc). "cpu" always synchronizes with the CPU clock. "none" removes all synchronization control.
(unlabeled) (of type [source('a)]): List of sources to which the new clock will be assigned.

`clock.log`

Create a log of clock times for all the clocks initially present. The log is in a simple format which you can directly use with gnuplot.

Type:

(?delay : float, ?every : float, string) -> unit

Arguments:

delay (of type float, which defaults to 0.): Delay before setting up the clock logger. This should be used to ensure that the logger starts only after the clocks are created.
every (of type float, which defaults to 1.): Polling interval.
(unlabeled) (of type string): Path of the log file.

`clock.status`

Get the current time (in ticks) for all allocated clocks.

Type:

() -> [string * int]

Arguments:

`clock.status.seconds`

Get the current time in seconds for all allocated clocks.

Type:

() -> [string * float]

Arguments:

`clock.unify`

Enforce that a list of sources all belong to the same clock.

Type:

([source('a)]) -> unit

Arguments:

(unlabeled) (of type [source('a)])

`configure.bindir`

Liquidsoap’s Internal script directory.

Type:

string

Arguments:

`configure.camomile_dir`

Liquidsoap’s camomile files directory.

Type:

string

Arguments:

`configure.default_font`

Liquidsoap’s default font file.

Type:

string

Arguments:

`configure.libdir`

Liquidsoap’s library directory.

Type:

string

Arguments:

`configure.logdir`

Liquidsoap’s logging directory.

Type:

string

Arguments:

`configure.rundir`

Liquidsoap’s PID file directory.

Type:

string

Arguments:

`enable_external_faad_decoder`

Enable or disable external FAAD (AAC/AAC+/M4A) decoders. Does not work on Win32. Please note that built-in support for faad is available in liquidsoap if compiled and should be preferred over the external decoder.

Type:

() -> unit

Arguments:

`enable_external_ffmpeg_decoder`

Enable ffmpeg decoder.

Type:

() -> unit

Arguments:

`enable_external_flac_decoder`

Enable external FLAC decoders. Please note that built-in support for FLAC is available in liquidsoap if compiled and should be preferred over the external decoder.

Type:

() -> unit

Arguments:

`enable_external_mpc_decoder`

Enable external Musepack decoder.

Type:

() -> unit

Arguments:

`enable_replaygain_metadata`

Enable ReplayGain metadata resolver. This resolver will process any file decoded by Liquidsoap and add a replaygain_track_gain metadata when this value could be computed. For a finer-grained replay gain processing, use the replaygain: protocol.

Type:

(?delay : float, ?extract_replaygain : string) -> unit

Arguments:

delay (of type float, which defaults to -1.): Maximum delay for extracting metadata.
extract_replaygain (of type string, which defaults to "/usr/share/liquidsoap/2.1.0/bin/extract-replaygain"): The extraction program.

`encoder.content_type`

Return the content-type (mime) of an encoder, if known.

Type:

(format('a)) -> string

Arguments:

(unlabeled) (of type format('a))

`encoder.extension`

Return the file extension of an encoder, if known.

Type:

(format('a)) -> string

Arguments:

(unlabeled) (of type format('a))

`error.raise`

Raise an error.

Type:

(error
 .{kind : string, message : string, positions : [string]
 }, ?string) -> 'a

Arguments:

(unlabeled) (of type error .{kind : string, message : string, positions : [string]}): Error kind.
(unlabeled) (of type string, which defaults to ""): Description of the error.

`error.register`

Type:

(string) -> error

Arguments:

(unlabeled) (of type string): Kind of the error

Methods:

kind (of type string): Error kind.
message (of type string): Error message.
positions (of type [string]): Error positions.

`failwith`

Major failure.

Type:

(string) -> 'a

Arguments:

(unlabeled) (of type string): Explanation about the failure.

`frame.duration`

Duration of a frame.

Type:

() -> float

Arguments:

`fst`

Get the first component of a pair.

Type:

(('a * 'b)) -> 'a

Arguments:

(unlabeled) (of type 'a * 'b)

`getter`

Create a getter.

Type:

({'a}) -> {'a}

Arguments:

(unlabeled) (of type {'a}): Value from which the getter should be created.

`getter.case`

Return a value depending on whether the getter is constant or not.

Type:

({'a}, (('a) -> 'b), (((() -> 'a)) -> 'b)) -> 'b

Arguments:

(unlabeled) (of type {'a}): Getter to inspect.
(unlabeled) (of type ('a) -> 'b)
(unlabeled) (of type ((() -> 'a)) -> 'b)

`getter.changes`

Detect whether the value of the getter changes.

Type:

({'a}) -> () -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type {'a} where 'a is an orderable type)

`getter.float_of_int`

Convert an int getter to a float getter.

Type:

({int}) -> {float}

Arguments:

(unlabeled) (of type {int})

`getter.function`

Construct a function returning the value of a getter.

Type:

({'a}) -> () -> 'a

Arguments:

(unlabeled) (of type {'a})

`getter.get`

Get the value of a getter.

Type:

({'a}) -> 'a

Arguments:

(unlabeled) (of type {'a})

`getter.int_of_float`

Convert a float getter to a int getter.

Type:

({float}) -> {int}

Arguments:

(unlabeled) (of type {float})

`getter.is_constant`

Determine if a getter is a constant.

Type:

({'a}) -> bool

Arguments:

(unlabeled) (of type {'a})

`getter.map`

Apply a function on a getter.

Type:

((('a) -> 'b), {'a}) -> {'b}

Arguments:

(unlabeled) (of type ('a) -> 'b): Function to apply.
(unlabeled) (of type {'a})

`getter.map.memoize`

Apply a function on a getter. If the input value has not changed compared to last call, the previous result is returned without computing the function again.

Type:

((('a) -> 'b), {'a}) -> {'b}
where 'a is an orderable type

Arguments:

(unlabeled) (of type ('a) -> 'b where 'a is an orderable type): Function to apply.
(unlabeled) (of type {'a} where 'a is an orderable type)

`getter.merge`

Give the latest value among two getters.

Type:

({'a}, {'a}) -> () -> 'a where 'a is an orderable type

Arguments:

(unlabeled) (of type {'a} where 'a is an orderable type)
(unlabeled) (of type {'a} where 'a is an orderable type)

`getter.on_change`

Execute a function when the value of the getter changes.

Type:

((('a) -> unit), {'a}) -> () -> 'a
where 'a is an orderable type

Arguments:

(unlabeled) (of type ('a) -> unit where 'a is an orderable type)
(unlabeled) (of type {'a} where 'a is an orderable type)

`harbor.http.register`

Register a HTTP handler on the harbor. The given function receives as argument the full requested uri (e.g. “foo?var=bar”), http protocol version, possible input data and the list of HTTP headers and returns the answer sent to the client, including HTTP headers. Registered uri can be regular expressions (e.g. “.+.php”) and can override default metadata handlers. Response is a string getter, i.e. either of type string or type ()->string. In the later case, getter function will be called until it returns an empty string.

Type:

(?port : int, ?method : string, string,
 ((protocol : string, data : string,
   headers : [string * string], string) -> {string})) ->
unit

Arguments:

port (of type int, which defaults to 8000): Port to server.
method (of type string, which defaults to "GET"): Accepted method (“GET” / “POST” / “PUT” / “DELETE” / “HEAD” / “OPTIONS”).
(unlabeled) (of type string): URI to serve.
(unlabeled) (of type (protocol : string, data : string, headers : [string * string], string) -> {string}): Function to execute. Method argument is “PUT” or “GET”, protocol argument is “HTTP/1.1” or “HTTP/1.0” etc., data argument contains data passed in case of a PUT request, and “” otherwise. Headers argument contains the HTTP headers. Unlabeled argument contains the requested URI.

`harbor.http.remove`

Remove a registered HTTP handler on the harbor.

Type:

(?port : int, ?method : string, string) -> unit

Arguments:

port (of type int, which defaults to 8000): Port to server.
method (of type string, which defaults to "GET"): Method served.
(unlabeled) (of type string): URI served.

`harbor.https.register`

Register a HTTPS handler on the harbor. The given function receives as argument the full requested uri (e.g. “foo?var=bar”), http protocol version, possible input data and the list of HTTP headers and returns the answer sent to the client, including HTTP headers. Registered uri can be regular expressions (e.g. “.+.php”) and can override default metadata handlers. Response is a string getter, i.e. either of type string or type ()->string. In the later case, getter function will be called until it returns an empty string.

Type:

(?port : int, ?method : string, string,
 ((protocol : string, data : string,
   headers : [string * string], string) -> {string})) ->
unit

Arguments:

port (of type int, which defaults to 8000): Port to server.
method (of type string, which defaults to "GET"): Accepted method (“GET” / “POST” / “PUT” / “DELETE” / “HEAD” / “OPTIONS”).
(unlabeled) (of type string): URI to serve.
(unlabeled) (of type (protocol : string, data : string, headers : [string * string], string) -> {string}): Function to execute. Method argument is “PUT” or “GET”, protocol argument is “HTTP/1.1” or “HTTP/1.0” etc., data argument contains data passed in case of a PUT request, and “” otherwise. Headers argument contains the HTTP headers. Unlabeled argument contains the requested URI.

`harbor.https.remove`

Remove a registered HTTPS handler on the harbor.

Type:

(?port : int, ?method : string, string) -> unit

Arguments:

port (of type int, which defaults to 8000): Port to server.
method (of type string, which defaults to "GET"): Method served.
(unlabeled) (of type string): URI served.

`http.error`

Base error for http

Type:

error
.{kind : string, message : string, positions : [string]}

Arguments:

`liquidsoap.chroot.make`

Export all the files required to install liquidsoap in a root folder. Usefull for packaging and docker images

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`liquidsoap.executable`

Path to the Liquidsoap executable.

Type:

string

Arguments:

`liquidsoap.version`

Liquidsoap version string.

Type:

string

Arguments:

`liquidsoap.version.at_least`

Ensure that Liquidsoap version is greater or equal to given one.

Type:

(string) -> bool

Arguments:

(unlabeled) (of type string): Minimal version.

`log`

Log a message.

Type:

(?label : string, ?level : int, string) -> unit

Arguments:

label (of type string, which defaults to "lang")
level (of type int, which defaults to 3)
(unlabeled) (of type string)

`log.critical`

Log a critical message

Type:

(?label : string, string) -> unit

Arguments:

label (of type string, which defaults to "lang")
(unlabeled) (of type string)

`log.debug`

Log a debug message

Type:

(?label : string, string) -> unit

Arguments:

label (of type string, which defaults to "lang")
(unlabeled) (of type string)

`log.file`

Get and set the file logging

Type:

() -> bool

Arguments:

`log.important`

Log an important message

Type:

(?label : string, string) -> unit

Arguments:

label (of type string, which defaults to "lang")
(unlabeled) (of type string)

`log.info`

Log a normal message

Type:

(?label : string, string) -> unit

Arguments:

label (of type string, which defaults to "lang")
(unlabeled) (of type string)

`log.level`

Get and set the log level.

Type:

() -> int

Arguments:

`log.severe`

Log a severe message

Type:

(?label : string, string) -> unit

Arguments:

label (of type string, which defaults to "lang")
(unlabeled) (of type string)

`log.stdout`

Get and set logging to stdout

Type:

() -> bool

Arguments:

`null`

Create a nullable value.

Type:

(?'a?) -> 'a?

Arguments:

(unlabeled) (of type 'a?, which defaults to null): Value to make nullable.

`null.case`

Return a result dending on whether a value is nothing or not.

Type:

('a?, (() -> 'b), (('a) -> 'b)) -> 'b

Arguments:

(unlabeled) (of type 'a?): Value to reason by case analysis on.
(unlabeled) (of type () -> 'b): Value to return in case we have nothing.
(unlabeled) (of type ('a) -> 'b): Value to return in case we have something.

`null.default`

Return a result dending on whether a value is nothing or not.

Type:

('a?, (() -> 'a)) -> 'a

Arguments:

(unlabeled) (of type 'a?): Value to reason by case analysis on.
(unlabeled) (of type () -> 'a): Value to return in case we have nothing.

`null.defined`

Determine whether a nullable value is not null.

Type:

('a?) -> bool

Arguments:

(unlabeled) (of type 'a?)

`null.get`

Get the value of a nullable. Raises error.not_found if the value is null and no default value was specified.

Type:

(?default : 'a?, 'a?) -> 'a

Arguments:

default (of type 'a?, which defaults to null): Returned value when the value is null.
(unlabeled) (of type 'a?)

`null.to_list`

Convert a nullable value to a list containing zero or one element depending on whether the value is null or not.

Type:

('a?) -> ['a]

Arguments:

(unlabeled) (of type 'a?)

`playlist.files`

Retrieve the list of files contained in a playlist.

Type:

(?id : string?, ?mime_type : string?, ?timeout : float,
 string) -> [string]

Arguments:

id (of type string?, which defaults to null)
mime_type (of type string?, which defaults to null): Default MIME type for the playlist. null means automatic detection.
timeout (of type float, which defaults to 20.): Timeout for resolving the playlist
(unlabeled) (of type string): Path to the playlist

`playlist.id`

Default id assignment for playlists

Type:

(default : string, string) -> string

Arguments:

default (of type string): Default name pattern when no useful name can be extracted from uri
(unlabeled) (of type string): Playlist uri

`playlist.parse`

Try to parse a local playlist. Return a list of (metadata,URI) items, where metadata is a list of (key,value) bindings.

Type:

(?path : string, ?mime : string?, string) ->
[[string * string] * string]

Arguments:

path (of type string, which defaults to ""): Default path for files.
mime (of type string?, which defaults to null): Mime type for the playlist
(unlabeled) (of type string)

`playlist.parse.register`

Type:

(format : string, strict : bool,
 ((?pwd : string, string) ->
  [[string * string] * string])) -> unit

Arguments:

format (of type string): Playlist format. If possible, a mime-type.
strict (of type bool): True if playlist format can be detected unambiguously.
(unlabeled) (of type (?pwd : string, string) -> [[string * string] * string]): Playlist parser

`predicate.activates`

Detect when a predicate becomes true.

Type:

(?init : bool, (() -> bool)) -> () -> bool

Arguments:

init (of type bool, which defaults to false): Detect at beginning.
(unlabeled) (of type () -> bool): Predicate.

`predicate.changes`

Detect when a predicate changes.

Type:

((() -> 'a)) -> () -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type () -> 'a where 'a is an orderable type): Predicate.

`predicate.first`

First occurrence of a predicate.

Type:

((() -> bool)) -> () -> bool

Arguments:

(unlabeled) (of type () -> bool): Predicate.

`predicate.once`

Become true once every time a predicate is true.

Type:

((() -> bool)) -> () -> bool

Arguments:

(unlabeled) (of type () -> bool): Predicate.

`predicate.signal`

Predicate which is true when a signal is sent. The returned predicate has a method signal to send the signal.

Type:

() -> () -> bool

Arguments:

Methods:

signal (of type () -> unit): Send a signal.

`process_uri`

Create a process: uri, replacing : with $(colon)

Type:

(extname : 'a, ?uri : string, string) -> string

Arguments:

extname (of type 'a): Output file extension (with no leading ‘.’)
uri (of type string, which defaults to ""): Input uri
(unlabeled) (of type string): Command line to execute

`profiler.disable`

Record profiling statistics.

Type:

() -> unit

Arguments:

`profiler.enable`

Record profiling statistics.

Type:

() -> unit

Arguments:

`profiler.run`

Time a function with the profiler.

Type:

(string, (() -> 'a)) -> 'a

Arguments:

(unlabeled) (of type string): Name of the profiled function.
(unlabeled) (of type () -> 'a): Function to profile.

`profiler.stats.string`

Profiling statistics.

Type:

() -> string

Arguments:

`prometheus.latency`

Monitor a source’s internal latencies on Prometheus

Type:

(?window : float, ?prefix : string, labels : [string]) ->
(label_values : [string], source('a)) -> unit

Arguments:

window (of type float, which defaults to 5.): Window over which mean and peak metrics are reported.
prefix (of type string, which defaults to "liquidsoap_"): Prefix for the metric’s name
labels (of type [string]): labels for the metric

`ref`

Create a reference, i.e. a value which can be modified.

Type:

('a) -> ref('a)

Arguments:

(unlabeled) (of type 'a)

`ref.get`

Retrieve the contents of a reference.

Type:

(ref('a)) -> 'a

Arguments:

(unlabeled) (of type ref('a))

`ref.getter`

Create a getter from a reference.

Type:

(ref('a)) -> () -> 'a

Arguments:

(unlabeled) (of type ref('a))

Methods:

set (of type ('A) -> unit)

`ref.incr`

Increment a reference to an integer.

Type:

(ref(int)) -> unit

Arguments:

(unlabeled) (of type ref(int))

`ref.set`

Set the value of a reference.

Type:

(ref('a), 'a) -> unit

Arguments:

(unlabeled) (of type ref('a))
(unlabeled) (of type 'a)

`request.create`

Create a request from an URI.

Type:

(?indicators : [string], ?persistent : bool,
 ?temporary : bool, string) -> request

Arguments:

indicators (of type [string], which defaults to [])
persistent (of type bool, which defaults to false): Indicate that the request is persistent, i.e. that it may be used again once it has been played.
temporary (of type bool, which defaults to false): Indicate that the request is a temporary file: it will be destroyed after being played.
(unlabeled) (of type string)

`request.destroy`

Destroying a request causes any temporary associated file to be deleted, and releases its RID. Persistent requests resist to destroying, unless forced.

Type:

(?force : bool, request) -> unit

Arguments:

force (of type bool, which defaults to false): Destroy the request even if it is persistent.
(unlabeled) (of type request)

`request.duration`

Compute the duration in seconds of audio data contained in a request. The computation may be expensive. Returns -1. if computation failed, typically if the file was not recognized as valid audio.

Type:

(string) -> float

Arguments:

(unlabeled) (of type string)

`request.filename`

Return a valid local filename if the request is ready, and the empty string otherwise.

Type:

(request) -> string

Arguments:

(unlabeled) (of type request)

`request.id`

Identifier of a request.

Type:

(request) -> int

Arguments:

(unlabeled) (of type request)

`request.log`

Get log data associated to a request.

Type:

(request) -> string

Arguments:

(unlabeled) (of type request)

`request.metadata`

Get the metadata associated to a request.

Type:

(request) -> [string * string]

Arguments:

(unlabeled) (of type request)

`request.read_metadata`

Force reading the metadata of a request.

Type:

(request) -> unit

Arguments:

(unlabeled) (of type request)

`request.resolve`

Resolve a request, i.e. attempt to get a valid local file. The operation can take some time. Return true if the resolving was successful, false otherwise (timeout or invalid URI). The request should not be decoded afterward: this is mostly useful to download files such as playlists, etc.

Type:

(?content_type : source('a)?, ?timeout : float, request) ->
bool

Arguments:

content_type (of type source('a)?, which defaults to null): If specified, the request will be decoded with the same content type as the given source.
timeout (of type float, which defaults to 30.): Limit in seconds to the duration of the resolving.
(unlabeled) (of type request)

`request.resolved`

Check if a request is resolved, i.e. is associated to a valid local file.

Type:

(request) -> bool

Arguments:

(unlabeled) (of type request)

`request.status`

Current status of a request. Can be idle, resolving, ready, playing or destroyed.

Type:

(request) -> string

Arguments:

(unlabeled) (of type request)

`request.uri`

Initial URI of a request.

Type:

(request) -> string

Arguments:

(unlabeled) (of type request)

`runtime.gc.full_major`

Trigger full major garbage collection.

Type:

() -> unit

Arguments:

`runtime.gc.get`

Return the current values of the GC parameters

Type:

() -> unit

Arguments:

Methods:

allocation_policy (of type int)
custom_major_ratio (of type int)
custom_minor_max_size (of type int)
custom_minor_ratio (of type int)
major_heap_increment (of type int)
max_overhead (of type int)
minor_heap_size (of type int)
space_overhead (of type int)
stack_limit (of type int)
verbose (of type int)
window_size (of type int)

`runtime.gc.print_stat`

Print the current values of the memory management counters in human-readable form.

Type:

() -> unit

Arguments:

`runtime.gc.quick_stat`

Same as stat except that live_words, live_blocks, free_words, free_blocks, largest_free, and fragments are set to 0. This function is much faster than gc.stat because it does not need to go through the heap.

Type:

() -> unit

Arguments:

Methods:

compactions (of type int)
fragments (of type int)
free_blocks (of type int)
free_words (of type int)
heap_chunks (of type int)
heap_words (of type int)
largest_free (of type int)
live_blocks (of type int)
live_words (of type int)
major_collections (of type int)
major_words (of type float)
minor_collections (of type int)
minor_words (of type float)
promoted_words (of type float)
stack_size (of type int)
top_heap_words (of type int)

`runtime.gc.set`

Set the GC parameters.

Type:

(
 {
   allocation_policy : int,
   custom_major_ratio : int,
   custom_minor_max_size : int,
   custom_minor_ratio : int,
   major_heap_increment : int,
   max_overhead : int,
   minor_heap_size : int,
   space_overhead : int,
   stack_limit : int,
   verbose : int,
   window_size : int
 }) -> unit

Arguments:

(unlabeled) (of type { allocation_policy : int, custom_major_ratio : int, custom_minor_max_size : int, custom_minor_ratio : int, major_heap_increment : int, max_overhead : int, minor_heap_size : int, space_overhead : int, stack_limit : int, verbose : int, window_size : int })

`runtime.gc.stat`

Return the current values of the memory management counters. This function examines every heap block to get the statistics.

Type:

() -> unit

Arguments:

Methods:

compactions (of type int)
fragments (of type int)
free_blocks (of type int)
free_words (of type int)
heap_chunks (of type int)
heap_words (of type int)
largest_free (of type int)
live_blocks (of type int)
live_words (of type int)
major_collections (of type int)
major_words (of type float)
minor_collections (of type int)
minor_words (of type float)
promoted_words (of type float)
stack_size (of type int)
top_heap_words (of type int)

`runtime.mem_usage.prettify_bytes`

Returns a human-redable description of an amount of bytes.

Type:

(?float_printer : ((float) -> string)?, ?signed : bool?,
 ?bits : bool?, ?binary : bool?, int) -> string

Arguments:

float_printer (of type ((float) -> string)?, which defaults to null)
signed (of type bool?, which defaults to null)
bits (of type bool?, which defaults to null)
binary (of type bool?, which defaults to null)
(unlabeled) (of type int)

`runtime.memory`

Returns information about the system and process’ memory usage. Requires mem_usage for a full report.

Type:

() -> unit

Arguments:

Methods:

pretty (of type { process_managed_memory : string, process_physical_memory : string, process_virtual_memory : string, total_physical_memory : string, total_used_physical_memory : string, total_used_virtual_memory : string, total_virtual_memory : string })
process_managed_memory (of type int)
process_physical_memory (of type int)
process_virtual_memory (of type int)
total_physical_memory (of type int)
total_used_physical_memory (of type int)
total_used_virtual_memory (of type int)
total_virtual_memory (of type int)

`runtime.sys.word_size`

Size of one word on the machine currently executing the program, in bits. Either 32 or 64.

Type:

int

Arguments:

`seconds_of_main`

Convert a number of main ticks in seconds.

Type:

(int) -> float

Arguments:

(unlabeled) (of type int)

`server.execute`

Execute a liquidsoap server command.

Type:

(string, ?string) -> [string]

Arguments:

(unlabeled) (of type string): Command to execute.
(unlabeled) (of type string, which defaults to ""): Argument for the command.

`settings`

All settings.

Type:


{
  alsa : 
  {
    alsa_buffer : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    buffer_length : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    comments : string,
    description : string,
    periods : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    }
  },
  audio : 
  {
    comments : string,
    converter : 
    {
      channel_layout : 
      {
        comments : string,
        converters : (() -> [string])
        .{
          comments : string,
          description : string,
          set : ([string]) -> unit
        },
        description : string
      },
      comments : string,
      description : string,
      samplerate : 
      {
        comments : string,
        converters : (() -> [string])
        .{
          comments : string,
          description : string,
          set : ([string]) -> unit
        },
        description : string,
        libsamplerate : 
        {
          comments : string,
          description : string,
          quality : (() -> string)
          .{
            comments : string,
            description : string,
            set : (string) -> unit
          }
        },
        native : 
        {
          comments : string,
          description : string,
          quality : (() -> string)
          .{
            comments : string,
            description : string,
            set : (string) -> unit
          }
        }
      }
    },
    description : string
  },
  clock : 
  {
    allow_streaming_errors : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    comments : string,
    description : string,
    log_delay : (() -> float)
    .{
      comments : string,
      description : string,
      set : (float) -> unit
    }
  },
  comments : string,
  console : 
  {
    colorize : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    },
    comments : string,
    description : string
  },
  decoder : 
  {
    comments : string,
    debug : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    decoders : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    description : string,
    ffmpeg : 
    {
      codecs : 
      {
        _4xm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        aac : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        aasc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ac3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        acelpkelvin : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_4xm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_adx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_afc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_agm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_dtk : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_ea_xas : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_g726le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_ima_ea_eacs : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_ima_ea_sead : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_ima_qt : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_ima_smjpeg : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_ima_ws : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_psx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_swf : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_thp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_thp_le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        adpcm_yamaha : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        agm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        aic : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        alac : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        amr_nb : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        amr_wb : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        amv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        anm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ansi : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ape : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        apng : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        aptx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        arbc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        argo : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        asv1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        asv2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        atrac1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        atrac3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        atrac3al : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        atrac9 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        aura : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        aura2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        av1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        avc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        avrn : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        avrp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        avs : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        avui : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ayuv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        bethsoftvid : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        bfi : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        binkaudio_dct : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        binkvideo : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        bitpacked : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        bmp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        bmv_audio : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        bmv_video : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        brender_pix : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        c93 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cavs : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cdxl : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cfhd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cljr : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cllc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cmv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        comfortnoise : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        comments : string,
        cook : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cpia : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cri : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cscd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        cyuv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dds : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        description : string,
        dfa : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dpx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dsd_lsbf_planar : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dsd_msbf_planar : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dsicinvideo : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dss_sp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dst : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dts : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dxa : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dxtory : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        dxv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        eac3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        escape124 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        escape130 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        evrc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        exr : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        fastaudio : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ffv1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        fic : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        fits : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        flac : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        flashsv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        flic : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        flv1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        fmvc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        fraps : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        frwu : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        g2m : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        g723_1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        g729 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        gdv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        gif : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        gsm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        h261 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        h263 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        h263i : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        h263p : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        h264 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hap : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hca : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hcom : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hevc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hnm4video : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hq_hqa : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hqx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        hymt : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        iac : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        iff_ilbm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ilbc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        imc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        imm4 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        imm5 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        interplayacm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        interplayvideo : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ipu : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        jpeg2000 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        jv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        kgv1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        kmvc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        lagarith : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        loco : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        lscr : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        m101 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mace3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mace6 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mad : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mdec : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        metasound : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mimic : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mjpeg : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mjpegb : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mlp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mobiclip : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        motionpixels : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mp1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mp2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mp3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mpeg1video : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mpeg2video : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mpeg4 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        msa1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mscc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        msmpeg4v1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        msmpeg4v2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        msmpeg4v3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        msp2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        msrle : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mss1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mss2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mszh : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mts2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mv30 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mvc1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mvc2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mvdv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mvha : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mwsc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        mxpeg : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        notchlc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        nuv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        opus : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pam : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pbm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_bluray : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_dvd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_f16le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_f24le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_f32be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_f32le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_f64be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_f64le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_lxf : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s16be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s16le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s16le_planar : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s24be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s24daud : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s24le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s24le_planar : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s32be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s32le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s32le_planar : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s64be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_s64le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_sga : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_u16be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_u16le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_u24be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_u24le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_u32be : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_u32le : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcm_vidc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pcx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pfm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pgm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pgmyuv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pgx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        pictor : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        png : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ppm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        psd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ptx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        qdm2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        qdmc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        qpeg : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        r10k : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        r210 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ralf : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rasc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rl2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        roq : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rpza : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rscc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rv10 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rv20 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rv30 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        rv40 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sanm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sbc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        scpr : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        screenpresso : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sdx2_dpcm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sgi : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        simbiosis_imx : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sipr : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        siren : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        smc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        snow : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sol_dpcm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sonic : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        sp5x : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        speedhq : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        speex : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        srgc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        svg : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        svq1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        svq3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tak : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        targa : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        targa_y216 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tdsc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tgq : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tgv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        theora : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        thp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tiertexseqvideo : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tiff : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tmv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tqi : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        truehd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        truemotion1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        truemotion2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        truemotion2rt : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tscc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tscc2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        tta : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        txd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ulti : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        v210 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        v210x : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        v308 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        v408 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        v410 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vb : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vble : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vc1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vc1image : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vcr1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vixl : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vmdaudio : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vmdvideo : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vmnc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vorbis : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp4 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp5 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp6 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp6a : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp6f : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp7 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp8 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        vp9 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wavesynth : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wavpack : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wcmv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        webp : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        westwood_snd1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wmalossless : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wmavoice : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wmv1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wmv2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wmv3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        wnv1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ws_vqa : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xan_wc3 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xan_wc4 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xbm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xma1 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xma2 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xpm : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        xwd : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        y41p : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        ylc : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        yop : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        yuv4 : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        zlib : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        },
        zmbv : (() -> string?)
        .{
          available : (() -> [string])
          .{
            comments : string,
            description : string,
            set : ([string]) -> unit
          },
          comments : string,
          description : string,
          set : (string) -> unit
        }
      },
      comments : string,
      description : string
    },
    file_extensions : 
    {
      aac : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      aiff : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      comments : string,
      description : string,
      ffmpeg : (() -> [string])
      .{
        comments : string,
        description : string,
        images : (() -> [string])
        .{
          comments : string,
          description : string,
          set : ([string]) -> unit
        },
        set : ([string]) -> unit
      },
      flac : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      id3 : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      image_metadata : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      mad : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      mp3 : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      mp4 : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      ogg : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      srt : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      taglib : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      video_metadata : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      wav : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      }
    },
    id3 : 
    {comments : string, description : string
    },
    image_file_decoders : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    image_metadata : 
    {comments : string, description : string
    },
    mime_types : 
    {
      aac : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      aiff : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      basic : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      comments : string,
      description : string,
      ffmpeg : (() -> [string])
      .{
        comments : string,
        description : string,
        images : (() -> [string])
        .{
          comments : string,
          description : string,
          set : ([string]) -> unit
        },
        set : ([string]) -> unit
      },
      flac : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      id3 : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      image_metadata : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      mad : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      mp3 : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      mp4 : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      ogg : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      srt : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      taglib : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      video_metadata : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      },
      wav : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      }
    },
    priorities : 
    {
      aac : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      aiff : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      basic : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      comments : string,
      description : string,
      ffmpeg : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      flac : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      mad : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      mp4 : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      ogg : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      srt : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      wav : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      }
    },
    taglib : 
    {comments : string, description : string
    },
    video_metadata : 
    {comments : string, description : string
    }
  },
  description : string,
  encoder : 
  {
    comments : string,
    description : string,
    metadata : 
    {
      comments : string,
      description : string,
      export : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      }
    }
  },
  ffmpeg : 
  {
    comments : string,
    description : string,
    log : 
    {
      comments : string,
      description : string,
      level : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      verbosity : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      }
    },
    scaling_algorithm : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    }
  },
  frame : 
  {
    audio : 
    {
      channels : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      comments : string,
      description : string,
      samplerate : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      size : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      }
    },
    comments : string,
    description : string,
    duration : (() -> float)
    .{
      comments : string,
      description : string,
      set : (float) -> unit
    },
    midi : 
    {
      channels : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      comments : string,
      description : string
    },
    video : 
    {
      comments : string,
      default : (() -> bool)
      .{
        comments : string,
        description : string,
        set : (bool) -> unit
      },
      description : string,
      framerate : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      height : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      width : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      }
    }
  },
  harbor : 
  {
    bind_addrs : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    comments : string,
    description : string,
    icy_formats : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    max_connections : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    reverse_dns : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    ssl : 
    {
      certificate : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      comments : string,
      description : string,
      password : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      private_key : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      read_timeout : (() -> float)
      .{
        comments : string,
        description : string,
        set : (float) -> unit
      },
      write_timeout : (() -> float)
      .{
        comments : string,
        description : string,
        set : (float) -> unit
      }
    },
    timeout : (() -> float)
    .{
      comments : string,
      description : string,
      set : (float) -> unit
    },
    verbose : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    }
  },
  init : 
  {
    allow_root : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    catch_exn : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    comments : string,
    daemon : (() -> bool)
    .{
      change_user : (() -> bool)
      .{
        comments : string,
        description : string,
        group : (() -> string)
        .{
          comments : string,
          description : string,
          set : (string) -> unit
        },
        set : (bool) -> unit,
        user : (() -> string)
        .{
          comments : string,
          description : string,
          set : (string) -> unit
        }
      },
      comments : string,
      description : string,
      pidfile : (() -> bool)
      .{
        comments : string,
        description : string,
        path : (() -> string?)
        .{
          comments : string,
          description : string,
          set : (string) -> unit
        },
        perms : (() -> int)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (bool) -> unit
      },
      set : (bool) -> unit
    },
    description : string,
    force_start : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    trace : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    }
  },
  lang : 
  {
    comments : string,
    debug : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    debug_errors : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    description : string
  },
  log : 
  {
    comments : string,
    description : string,
    file : (() -> bool)
    .{
      append : (() -> bool)
      .{
        comments : string,
        description : string,
        set : (bool) -> unit
      },
      comments : string,
      description : string,
      path : (() -> string?)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      perms : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      set : (bool) -> unit
    },
    level : (() -> int)
    .{
      annotate : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      audio : (() -> int?)
      .{
        comments : string,
        converter : (() -> int?)
        .{
          comments : string,
          description : string,
          libsamplerate : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        description : string,
        set : (int) -> unit
      },
      audioscrobbler : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      avi : (() -> int?)
      .{
        comments : string,
        description : string,
        encoder : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      camomile : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      clock : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      comments : string,
      console : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      decoder : (() -> int?)
      .{
        aac : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        camlimages : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        comments : string,
        description : string,
        external : (() -> int?)
        .{
          comments : string,
          description : string,
          oblivious : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        ffmpeg : (() -> int?)
        .{
          comments : string,
          description : string,
          image : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          internal : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        flac : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        id3 : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        image : (() -> int?)
        .{
          comments : string,
          description : string,
          metadata : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        mad : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        midi : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        mp4 : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        ogg : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        ppm : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        raw : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        sdlimage : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit,
        srt : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        taglib : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        video : (() -> int?)
        .{
          comments : string,
          description : string,
          metadata : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        wav_aiff : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        }
      },
      deprecated : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      description : string,
      dssi_synthesizer : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      dynamic : (() -> int?)
      .{
        comments : string,
        description : string,
        loader : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      ffmpeg : (() -> int?)
      .{
        comments : string,
        copy : (() -> int?)
        .{
          comments : string,
          description : string,
          encoder : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        decoder : (() -> int?)
        .{
          comments : string,
          copy : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          description : string,
          set : (int) -> unit
        },
        description : string,
        encoder : (() -> int?)
        .{
          comments : string,
          description : string,
          internal : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        },
        filter : (() -> int?)
        .{
          bitstream : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          comments : string,
          description : string,
          set : (int) -> unit
        },
        internal : (() -> int?)
        .{
          comments : string,
          decoder : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      file_watcher : (() -> int?)
      .{
        comments : string,
        description : string,
        native : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      frame : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      frei0r : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      harbor : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      hls : (() -> int?)
      .{
        comments : string,
        description : string,
        output : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      icy : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit,
        update_metadata : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        }
      },
      image : (() -> int?)
      .{
        comments : string,
        decoder : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        description : string,
        set : (int) -> unit
      },
      input : (() -> int?)
      .{
        comments : string,
        description : string,
        external : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit,
          video : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          }
        },
        http : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        jack : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      ladspa_extension : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      lang : (() -> int?)
      .{
        comments : string,
        description : string,
        json : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      langfile : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      lastfm : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit,
        submit : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        }
      },
      lifecycle : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      lo : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      metadata : (() -> int?)
      .{
        comments : string,
        description : string,
        flac : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        mp4 : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      oggmuxer : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      playlist : (() -> int?)
      .{
        basic : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        comments : string,
        description : string,
        set : (int) -> unit,
        xml : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        }
      },
      playlist_parser : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      process : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      prometheus : (() -> int?)
      .{
        comments : string,
        description : string,
        server : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      request : (() -> int?)
      .{
        comments : string,
        description : string,
        dynamic : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      sandbox : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      server : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      set : (int) -> unit,
      single : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      source : (() -> int?)
      .{
        comments : string,
        description : string,
        dump : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        set : (int) -> unit
      },
      srt : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      threads : (() -> int?)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      video : (() -> int?)
      .{
        add_text : (() -> int?)
        .{
          camlimages : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          comments : string,
          description : string,
          set : (int) -> unit
        },
        comments : string,
        converter : (() -> int?)
        .{
          comments : string,
          description : string,
          set : (int) -> unit
        },
        description : string,
        set : (int) -> unit,
        text : (() -> int?)
        .{
          comments : string,
          description : string,
          native : (() -> int?)
          .{
            comments : string,
            description : string,
            set : (int) -> unit
          },
          set : (int) -> unit
        }
      }
    },
    stdout : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    unix_timestamps : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    }
  },
  mpd : 
  {
    comments : string,
    debug : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    description : string,
    host : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    },
    path : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    },
    port : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    randomize : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    }
  },
  osc : 
  {
    comments : string,
    description : string,
    port : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    }
  },
  playlists : 
  {
    comments : string,
    cue_in_metadata : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    },
    cue_out_metadata : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    },
    description : string,
    mime_types : 
    {
      comments : string,
      description : string,
      xml : (() -> [string])
      .{
        comments : string,
        description : string,
        set : ([string]) -> unit
      }
    }
  },
  prometheus : 
  {
    comments : string,
    description : string,
    server : (() -> bool)
    .{
      comments : string,
      description : string,
      port : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      set : (bool) -> unit
    }
  },
  request : 
  {
    comments : string,
    description : string,
    leak_warning : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    metadata_decoders : (() -> [string])
    .{
      comments : string,
      description : string,
      duration : (() -> bool)
      .{
        comments : string,
        description : string,
        set : (bool) -> unit
      },
      override : (() -> bool)
      .{
        comments : string,
        description : string,
        set : (bool) -> unit
      },
      set : ([string]) -> unit
    }
  },
  root : 
  {
    comments : string,
    description : string,
    max_latency : (() -> float)
    .{
      comments : string,
      description : string,
      set : (float) -> unit
    }
  },
  sandbox : (() -> bool)
  .{
    binary : (() -> string)
    .{
      comments : string,
      description : string,
      set : (string) -> unit
    },
    comments : string,
    description : string,
    network : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    ro : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    rw : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    set : (bool) -> unit,
    setenv : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    },
    shell : (() -> bool)
    .{
      comments : string,
      description : string,
      path : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      set : (bool) -> unit
    },
    unsetenv : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    }
  },
  scheduler : 
  {
    comments : string,
    description : string,
    fast_queues : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    generic_queues : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    },
    log : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    non_blocking_queues : (() -> int)
    .{
      comments : string,
      description : string,
      set : (int) -> unit
    }
  },
  server : 
  {
    comments : string,
    description : string,
    log : 
    {
      comments : string,
      description : string,
      level : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      }
    },
    socket : (() -> bool)
    .{
      comments : string,
      description : string,
      path : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      permissions : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      set : (bool) -> unit
    },
    telnet : (() -> bool)
    .{
      bind_addr : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      comments : string,
      description : string,
      port : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      revdns : (() -> bool)
      .{
        comments : string,
        description : string,
        set : (bool) -> unit
      },
      set : (bool) -> unit
    },
    timeout : (() -> float)
    .{
      comments : string,
      description : string,
      set : (float) -> unit
    }
  },
  srt : 
  {
    comments : string,
    description : string,
    enforced_encryption : (() -> bool)
    .{
      comments : string,
      description : string,
      set : (bool) -> unit
    },
    log : (() -> bool)
    .{
      comments : string,
      description : string,
      level : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      },
      set : (bool) -> unit,
      verbosity : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      }
    },
    poll : 
    {
      comments : string,
      description : string,
      timeout : (() -> int)
      .{
        comments : string,
        description : string,
        set : (int) -> unit
      }
    }
  },
  tag : 
  {
    comments : string,
    description : string,
    encodings : (() -> [string])
    .{
      comments : string,
      description : string,
      set : ([string]) -> unit
    }
  },
  video : 
  {
    comments : string,
    converter : 
    {
      comments : string,
      description : string,
      preferred : (() -> string)
      .{
        comments : string,
        description : string,
        set : (string) -> unit
      },
      proportional_scale : (() -> bool)
      .{
        comments : string,
        description : string,
        set : (bool) -> unit
      }
    },
    description : string
  }
}

Arguments:

`snd`

Get the second component of a pair.

Type:

(('a * 'b)) -> 'b

Arguments:

(unlabeled) (of type 'a * 'b)

`source.dump`

Immediately encode the whole contents of a source into a file.

Type:

(format('a), string, source('b)) -> unit

Arguments:

(unlabeled) (of type format('a)): Encoding format.
(unlabeled) (of type string): Name of the file.
(unlabeled) (of type source('b)): Source to encode

This function is experimental.

`source.duration`

Estimation of the duration in the current track.

Type:

(source('a)) -> float

Arguments:

(unlabeled) (of type source('a))

`source.elapsed`

Elapsed time in the current track.

Type:

(source('a)) -> float

Arguments:

(unlabeled) (of type source('a))

`source.fallible`

Indicate if a source may fail, i.e. may not be ready to stream.

Type:

(source('a)) -> bool

Arguments:

(unlabeled) (of type source('a))

`source.id`

Get the identifier of a source.

Type:

(source('a)) -> string

Arguments:

(unlabeled) (of type source('a))

`source.init`

Simultaneously initialize sources, return the sublist of sources that failed to initialize.

Type:

([source(audio='a, video='b, midi='c)]) ->
[source(audio='a, video='b, midi='c)]

Arguments:

(unlabeled) (of type [source(audio='a, video='b, midi='c)])

This function is experimental.

`source.is_ready`

Indicate if a source is ready to stream (we also say that it is available), or currently streaming.

Type:

(source('a)) -> bool

Arguments:

(unlabeled) (of type source('a))

`source.remaining`

Estimation of remaining time in the current track.

Type:

(source('a)) -> float

Arguments:

(unlabeled) (of type source('a))

`source.seek`

Seek forward, in seconds. Returns the amount of time effectively seeked.

Type:

(source('a), float) -> float

Arguments:

(unlabeled) (of type source('a))
(unlabeled) (of type float)

`source.set_name`

Set the name of an operator.

Type:

(source('a), string) -> unit

Arguments:

(unlabeled) (of type source('a))
(unlabeled) (of type string)

`source.skip`

Skip to the next track.

Type:

(source('a)) -> unit

Arguments:

(unlabeled) (of type source('a))

`source.time`

Get a source’s time, based on its assigned clock

Type:

(source('a)) -> float

Arguments:

(unlabeled) (of type source('a))

`thread.mutexify`

Protect functions with a mutex in order to avoid concurrent calls. It returns the original value when the argument is not a function.

Type:

('a) -> 'a

Arguments:

(unlabeled) (of type 'a)

`thread.on_error`

Register the function to be called when an error of the given kind is raised in a thread. Catches all errors if first argument is null.

Type:

(error
 .{kind : string, message : string, positions : [string]
 }?,
 ((backtrace : string, error
   .{
     kind : string,
     message : string,
     positions : [string]
   }) -> unit)) -> unit

Arguments:

(unlabeled) (of type error .{kind : string, message : string, positions : [string]}?)
(unlabeled) (of type (backtrace : string, error .{kind : string, message : string, positions : [string] }) -> unit)

`thread.run.recurrent`

Run a recurrent function in a separate thread.

Type:

(?fast : bool, ?delay : float, (() -> float)) -> unit

Arguments:

fast (of type bool, which defaults to true): Whether the thread is supposed to return quickly or not. Typically, blocking tasks (e.g. fetching data over the internet) should not be considered to be fast. When set to false its priority will be lowered below that of request resolutions and fast timeouts. This is only effective if you set a dedicated queue for fast tasks, see the “scheduler” settings for more details.
delay (of type float, which defaults to 0.): Delay (in sec.) after which the thread should be launched.
(unlabeled) (of type () -> float): Function to execute recurrently. The returned value is the delay (in sec.) in which the function should be run again (it won’t be run if the value is strictly negative).

`time.make`

Convert a date and time in the local timezone into a time, in seconds, since 00:00:00 GMT, Jan. 1, 1970.

Type:

(
 {
   day : int,
   dst : bool?,
   hour : int,
   min : int,
   month : int,
   sec : int,
   year : int
 }) -> float

Arguments:

(unlabeled) (of type { day : int, dst : bool?, hour : int, min : int, month : int, sec : int, year : int })

`time.predicate`

Parse a string as a time predicate

Type:

(string) -> () -> bool

Arguments:

(unlabeled) (of type string)

`time.zone`

Returns a description of the time zone set for the running process.

Type:

() -> string

Arguments:

Methods:

daylight (of type string): Daylight Savings Time
utc_diff (of type int): Difference in seconds between the current timezone and UTC.

`time.zone.set`

Set the current time zone. This is equivalent to setting the TZ environment variable.

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`while`

A while loop.

Type:

({bool}, (() -> unit)) -> unit

Arguments:

(unlabeled) (of type {bool}): Condition guarding the loop.
(unlabeled) (of type () -> unit): Function to execute.

List

`_::_`

Add an element at the top of a list.

Type:

('a, ['a]) -> ['a]

Arguments:

(unlabeled) (of type 'a)
(unlabeled) (of type ['a])

`_[_]`

l[k] returns the first v such that (k,v) is in the list l (or “” if no such v exists).

Type:

(['a * string], 'a) -> string
where 'a is an orderable type

Arguments:

(unlabeled) (of type ['a * string] where 'a is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`list.add`

Add an element at the top of a list.

Type:

('a, ['a]) -> ['a]

Arguments:

(unlabeled) (of type 'a)
(unlabeled) (of type ['a])

`list.append`

Concatenate two lists.

Type:

(['a], ['a]) -> ['a]

Arguments:

(unlabeled) (of type ['a])
(unlabeled) (of type ['a])

`list.assoc`

Associate a value to a key in an association list. This functions raises error.not_found if no default value is specified.

Type:

(?default : 'a?, 'b, ['b * 'a]) -> 'a
where 'b is an orderable type

Arguments:

default (of type 'a?, which defaults to null): Value returned if the key is not found.
(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type ['b * 'a] where 'b is an orderable type)

`list.assoc.filter`

Keep only the elements of an association list satisfying a given predicate.

Type:

((('a, 'b) -> bool), ['a * 'b]) -> ['a * 'b]

Arguments:

(unlabeled) (of type ('a, 'b) -> bool)
(unlabeled) (of type ['a * 'b])

`list.assoc.mem`

list.assoc.mem(key,l) returns true if l contains a pair (key,value).

Type:

('a, ['a * 'b]) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type): Key to look for
(unlabeled) (of type ['a * 'b] where 'a is an orderable type): List of pairs (key,value)

`list.assoc.remove`

Remove the first pair from an associative list.

Type:

('a, ['a * 'b]) -> ['a * 'b]
where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type): Key of pair to be removed.
(unlabeled) (of type ['a * 'b] where 'a is an orderable type): List of pairs (key,value).

`list.assoc.remove.all`

Remove all pairs with given key from an associative list.

Type:

('a, ['a * 'b]) -> ['a * 'b]
where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type): Key of pairs to be removed.
(unlabeled) (of type ['a * 'b] where 'a is an orderable type): List of pairs (key,value).

`list.case`

Define a function by case analysis, depending on whether a list is empty or not.

Type:

(['a], 'b, (('a, ['a]) -> 'b)) -> 'b

Arguments:

(unlabeled) (of type ['a]): List to perform case analysis on.
(unlabeled) (of type 'b): Result when the list is empty.
(unlabeled) (of type ('a, ['a]) -> 'b): Result when the list is non-empty.

`list.cons`

Add an element at the top of a list.

Type:

('a, ['a]) -> ['a]

Arguments:

(unlabeled) (of type 'a)
(unlabeled) (of type ['a])

`list.dcase`

“Delayed” version of list.case where the value on empty list is only evaluated if necessary.

Type:

(['a], (() -> 'b), (('a, ['a]) -> 'b)) -> 'b

Arguments:

(unlabeled) (of type ['a])
(unlabeled) (of type () -> 'b)
(unlabeled) (of type ('a, ['a]) -> 'b)

`list.exists`

Check that a predicate is satisfied for some element in a list.

Type:

((('a) -> bool), ['a]) -> bool

Arguments:

(unlabeled) (of type ('a) -> bool): Predicate.
(unlabeled) (of type ['a]): List.

`list.filter`

Filter a list according to a predicate. The order in which elements are handled is not specified (and is currently implemented from the right).

Type:

(?remove : (('a) -> unit), (('a) -> bool), ['a]) -> ['a]

Arguments:

remove (of type ('a) -> unit, which defaults to <fun>): Function called on an element when it is removed.
(unlabeled) (of type ('a) -> bool): Predicate indicating whether an element should be kept or not.
(unlabeled) (of type ['a]): List to filter.

`list.find`

First element satisfying a predicate. Raises error.not_found if not element is found and no default value was specified.

Type:

(?default : 'a?, (('a) -> bool), ['a]) -> 'a

Arguments:

default (of type 'a?, which defaults to null): Returned value when the predicate is not found.
(unlabeled) (of type ('a) -> bool): Predicate.
(unlabeled) (of type ['a]): List.

`list.fold`

Fold a function on every element of a list: list.fold(f,x1,[e1,..,en]) is f(...f(f(x1,e1),e2)...,en).

Type:

((('a, 'b) -> 'a), 'a, ['b]) -> 'a

Arguments:

(unlabeled) (of type ('a, 'b) -> 'a): Function f for which f(x,e) which will be called on every element e with the current value of x, returning the new value of x.
(unlabeled) (of type 'a): Initial value x1, to be updated by successive calls of f(x,e).
(unlabeled) (of type ['b])

`list.fold.right`

Fold a function on every element of a list. Similar to list.fold but iterates from the right of the list. It is slightly more efficient than list.fold.

Type:

((('a, 'b) -> 'b), 'b, ['a]) -> 'b

Arguments:

(unlabeled) (of type ('a, 'b) -> 'b): Function f for which f(x,e) which will be called on every element e with the current value of x, returning the new value of x.
(unlabeled) (of type 'b): Initial value x1, to be updated by successive calls of f(x,e).
(unlabeled) (of type ['a])

`list.for_all`

Check that a predicate is satisfied for every element in a list.

Type:

((('a) -> bool), ['a]) -> bool

Arguments:

(unlabeled) (of type ('a) -> bool): Predicate.
(unlabeled) (of type ['a]): List.

`list.hd`

Return the head (first element) of a list, or default if the list is empty.

Type:

(?default : 'a?, ['a]) -> 'a

Arguments:

default (of type 'a?, which defaults to null): Default value if key does not exist.
(unlabeled) (of type ['a])

`list.ind`

Define a function by induction on a list. This is slightly more efficient than defining a recursive function. The list is scanned from the right.

Type:

(['a], 'b, (('a, ['a], 'b) -> 'b)) -> 'b

Arguments:

(unlabeled) (of type ['a]): List to perform induction on.
(unlabeled) (of type 'b): Result when the list is empty.
(unlabeled) (of type ('a, ['a], 'b) -> 'b): Result when the list is non-empty, given the current element, the tail and the result of the recursive call on the tail.

`list.index`

First index where a predicate is satisfied.

Type:

((('a) -> bool), ['a]) -> int

Arguments:

(unlabeled) (of type ('a) -> bool): Predicate.
(unlabeled) (of type ['a]): List.

`list.indexed`

Add indices to every element of a list, so that it can be accessed with the notation l[n].

Type:

(['a]) -> [int * 'a]

Arguments:

(unlabeled) (of type ['a])

`list.init`

Initialize a list.

Type:

(int, ((int) -> 'a)) -> ['a]

Arguments:

(unlabeled) (of type int): Number of elements in the list.
(unlabeled) (of type (int) -> 'a): Function such that f i is the ith element.

`list.insert`

Returns a copy of the given list with a new element inserted at a given position. Raises error.not_found if the list has less than index elements.

Type:

(int, 'a, ['a]) -> ['a]

Arguments:

(unlabeled) (of type int): Index to insert at, starting at 0.
(unlabeled) (of type 'a): Element to insert
(unlabeled) (of type ['a]): List to insert into.

`list.is_empty`

Determining whether a list is empty or not.

Type:

(['a]) -> bool

Arguments:

(unlabeled) (of type ['a])

`list.iter`

Call a function on every element of a list.

Type:

((('a) -> unit), ['a]) -> unit

Arguments:

(unlabeled) (of type ('a) -> unit)
(unlabeled) (of type ['a])

`list.iterator`

Create an iterator over the elements of a list.

Type:

(['a?]) -> () -> 'a?

Arguments:

(unlabeled) (of type ['a?])

`list.iteri`

Call a function on every element of a list, along with its index

Type:

(((int, 'a) -> unit), ['a]) -> unit

Arguments:

(unlabeled) (of type (int, 'a) -> unit)
(unlabeled) (of type ['a])

`list.last`

Return the last element of a list.

Type:

(?default : 'a?, ['a]) -> 'a

Arguments:

default (of type 'a?, which defaults to null)
(unlabeled) (of type ['a])

`list.length`

Compute the length of a list, i.e., the number of its elements.

Type:

(['a]) -> int

Arguments:

(unlabeled) (of type ['a])

`list.map`

Map a function on every element of a list.

Type:

((('a) -> 'b), ['a]) -> ['b]

Arguments:

(unlabeled) (of type ('a) -> 'b)
(unlabeled) (of type ['a])

`list.map.right`

Map a function on every element of a list, starting from the right. This function is tail-recursive.

Type:

((('a) -> 'b), ['a]) -> ['b]

Arguments:

(unlabeled) (of type ('a) -> 'b)
(unlabeled) (of type ['a])

`list.mapi`

Map a function on every element of a list, along with its index.

Type:

(((int, 'a) -> 'b), ['a]) -> ['b]

Arguments:

(unlabeled) (of type (int, 'a) -> 'b)
(unlabeled) (of type ['a])

`list.mem`

Check whether an element belongs to a list.

Type:

('a, ['a]) -> bool where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type ['a] where 'a is an orderable type)

`list.nth`

Get the n-th element of a list (the first element is at position 0), or default if element does not exist.

Type:

(?default : 'a?, ['a], int) -> 'a

Arguments:

default (of type 'a?, which defaults to null)
(unlabeled) (of type ['a])
(unlabeled) (of type int)

`list.pick`

Pick a random element in a list.

Type:

(?default : 'a?, ['a]) -> 'a

Arguments:

default (of type 'a?, which defaults to null): Value returned if the list is empty.
(unlabeled) (of type ['a]): List in which the element should be picked.

`list.prefix`

Compute the beginning of a list.

Type:

(int, ['a]) -> ['a]

Arguments:

(unlabeled) (of type int): Number of elements in the returned list.
(unlabeled) (of type ['a]): List whose prefix should be taken.

`list.randomize`

Shuffle the content of a list.

Type:

(['a]) -> ['a]

Arguments:

(unlabeled) (of type ['a])

`list.remove`

Remove the first occurrence of a value from a list.

Type:

('a, ['a]) -> ['a] where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type ['a] where 'a is an orderable type)

`list.rev`

Revert list order.

Type:

(['a]) -> ['a]

Arguments:

(unlabeled) (of type ['a])

`list.shuffle`

Create a list with the same elements as another, but in a random order.

Type:

(['a]) -> ['a]

Arguments:

(unlabeled) (of type ['a]): List of which the elements should be shuffled.

`list.sort`

Sort a list according to a comparison function.

Type:

((('a, 'a) -> int), ['a]) -> ['a]

Arguments:

(unlabeled) (of type ('a, 'a) -> int): Comparison function f such that f(x,y)<0 when x<y, f(x,y)=0 when x=y, and f(x,y)>0 when x>y.
(unlabeled) (of type ['a]): List to sort.

`list.tl`

Return the list without its first element.

Type:

(['a]) -> ['a]

Arguments:

(unlabeled) (of type ['a])

`null.find`

Find the first element of a list for which the image of the function is not null. Raises error.not_found if not element is found and no default value was specified.

Type:

(?default : 'a??, (('b) -> 'a?), ['b]) -> 'a?

Arguments:

default (of type 'a??, which defaults to null): Returned value when no element is found.
(unlabeled) (of type ('b) -> 'a?): Function.
(unlabeled) (of type ['b]): List.

List.

`list.make`

Create a list with given length, filled with given element.

Type:

(int, 'a) -> ['a]

Arguments:

(unlabeled) (of type int): Number of elements in the list.
(unlabeled) (of type 'a): Element to fill the list with.

Math

`*`

Multiplication of numbers.

Type:

('a, 'a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)
(unlabeled) (of type anything that is a number type)

`+`

Addition of numbers.

Type:

('a, 'a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)
(unlabeled) (of type anything that is a number type)

`-`

Subtraction of numbers.

Type:

('a, 'a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)
(unlabeled) (of type anything that is a number type)

`/`

Division of numbers.

Type:

('a, 'a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)
(unlabeled) (of type anything that is a number type)

`abs`

Absolute value.

Type:

('a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)

`acos`

Arc cosine. The argument must fall within the range [-1.0, 1.0]. Result is in radians and is between 0.0 and pi.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`asin`

Arc sine. The argument must fall within the range [-1.0, 1.0]. Result is in radians and is between -pi/2 and pi/2.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`atan`

Arc tangent. Result is in radians and is between -pi/2 and pi/2.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`bool_of_float`

Convert a float to a bool.

Type:

(float) -> bool

Arguments:

(unlabeled) (of type float)

`bool_of_int`

Convert an int to a bool.

Type:

(int) -> bool

Arguments:

(unlabeled) (of type int)

`cos`

Cosine. Argument is in radians.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`cosh`

Hyperbolic cosine. Argument is in radians.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`dB_of_lin`

Convert linear scale into decibels.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`exp`

Exponential.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`float`

Convert a number to a float.

Type:

('a) -> float where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)

`float_of_int`

Convert an int to a float.

Type:

(int) -> float

Arguments:

(unlabeled) (of type int)

`infinity`

Float representation of infinity.

Type:

float

Arguments:

`int`

Convert a number to an integer.

Type:

('a) -> int where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)

`int_of_float`

Convert a float to a int.

Type:

(float) -> int

Arguments:

(unlabeled) (of type float)

`lin_of_dB`

Convert decibels into linear scale.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`ln`

Natural logarithm.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`log10`

Base 10 logarithm.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`lsl`

Logical shift left.

Type:

(int, int) -> int

Arguments:

(unlabeled) (of type int): Number to shift.
(unlabeled) (of type int): Number of bits to shift.

`lsr`

Logical shift right.

Type:

(int, int) -> int

Arguments:

(unlabeled) (of type int): Number to shift.
(unlabeled) (of type int): Number of bits to shift.

`max`

Compute the maximum of two values.

Type:

('a, 'a) -> 'a where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`max_int`

Maximal representable integer.

Type:

int

Arguments:

`min`

Compute the minimum of two values.

Type:

('a, 'a) -> 'a where 'a is an orderable type

Arguments:

(unlabeled) (of type anything that is an orderable type)
(unlabeled) (of type anything that is an orderable type)

`min_int`

Minimal representable integer.

Type:

int

Arguments:

`mkfade`

Make a fade function based on a source’s clock.

Type:

(?type : string, ?start : float, ?stop : float,
 ?duration : float, ?on_done : (() -> unit), source('a)) ->
() -> float

Arguments:

type (of type string, which defaults to "lin"): Fade shape. One of: “sin”, “exp”, “log”, “lin”
start (of type float, which defaults to 0.): Start value.
stop (of type float, which defaults to 1.): Stop value.
duration (of type float, which defaults to 3.): Duration in seconds.
on_done (of type () -> unit, which defaults to <fun>): Function to execute when the fade is finished
(unlabeled) (of type source('a))

`mod`

Remainder of division of numbers.

Type:

('a, 'a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)
(unlabeled) (of type anything that is a number type)

`nan`

A special floating-point value denoting the result of an undefined operation such as 0.0 /. 0.0. Stands for ‘not a number’. Any floating-point operation with nan as argument returns nan as result. As for floating-point comparisons, ==, <, <=, > and >= return false and != returns true if one or both of their arguments is nan.

Type:

float

Arguments:

`pow`

Exponentiation of numbers.

Type:

('a, 'a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)
(unlabeled) (of type anything that is a number type)

`random.float`

Generate a random value between min (included) and max (excluded).

Type:

(?min : float, ?max : float) -> float

Arguments:

min (of type float, which defaults to 0.)
max (of type float, which defaults to 1.)

`random.int`

Generate a random value between min (included) and max (excluded).

Type:

(?min : int, ?max : int) -> int

Arguments:

min (of type int, which defaults to -536870911)
max (of type int, which defaults to 536870912)

`sin`

Sine. Argument is in radians.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`sinh`

Hyperbolic sine. Argument is in radians.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`sqrt`

Square root.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`tan`

Tangent. Argument is in radians.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`tanh`

Hyperbolic tangent. Argument is in radians.

Type:

(float) -> float

Arguments:

(unlabeled) (of type float)

`~-`

Returns the opposite of its argument.

Type:

('a) -> 'a where 'a is a number type

Arguments:

(unlabeled) (of type anything that is a number type)

Output

`output`

Output a stream using the default operator. The input source does not need to be infallible, blank will just be played during failures.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio=pcm('a), video='b, midi='c)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to true): Allow the child source to fail, in which case the output will be (temporarily) stopped.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): Source to play.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.audio_video`

Output a stream with audio and video using the default operator. The input source does not need to be infallible, blank will just be played during failures.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio=pcm('a), video=canvas('b),
 midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to true): Allow the child source to fail, in which case the output will be (temporarily) stopped.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
(unlabeled) (of type source(audio=pcm('a), video=canvas('b), midi='c)): Source to play.

`output.file.dash.ffmpeg`

Output an MPEG-DASH playlist using ffmpeg

Type:

(?id : string?, ?flush : bool, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?reopen_delay : float, ?reopen_on_metadata : bool,
 ?reopen_when : (() -> bool), ?start : bool,
 ?playlist : string, directory : 'a,
 source(audio=pcm(stereo), video=canvas, midi=none)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
flush (of type bool, which defaults to false): Perform a flush after each write.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be (temporarily) stopped.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
reopen_delay (of type float, which defaults to 120.): Prevent re-opening within that delay, in seconds.
reopen_on_metadata (of type bool, which defaults to false): Re-open on every new metadata information.
reopen_when (of type () -> bool, which defaults to {false}): When should the output be re-opened.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
playlist (of type string, which defaults to "stream.mpd"): Playlist name
directory (of type 'a): Directory to write to
(unlabeled) (of type source(audio=pcm(stereo), video=canvas, midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
reopen (of type () -> unit): Reopen the pipe.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.video`

Output a video stream using the default operator. The input source does not need to be infallible, blank will just be played during failures.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio='a, video=canvas('b),
 midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to true): Allow the child source to fail, in which case the output will be (temporarily) stopped.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
(unlabeled) (of type source(audio='a, video=canvas('b), midi='c)): Source to play.

`output.youtube.live.hls`

Stream to youtube using HLS.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?stream_info : (string * 
                 {
                   bandwidth : int,
                   codecs : string,
                   extname : string,
                   video_size : (int * int)?
                 })?,
 ?start : bool, ?url : string, key : string,
 encoder : format('a), source('a)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be (temporarily) stopped.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
stream_info (of type (string * { bandwidth : int, codecs : string, extname : string, video_size : (int * int)? })?, which defaults to null): Informations about the stream (see output.file.hls for details).
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
url (of type string, which defaults to "https://a.upload.youtube.com/http_upload_hls"): HLS URL to stream to
key (of type string): Your secret youtube key
encoder (of type format('a)): Encoder to use (most likely a %ffmpeg encoder)
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.youtube.live.rtmp`

Stream to youtube using RTMP.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, ?url : string, key : string,
 encoder : format('a), source('a)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be (temporarily) stopped.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when outputting stops.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
url (of type string, which defaults to "rtmp://a.rtmp.youtube.com/live2"): RTMP URL to stream to
key (of type string): Your secret youtube key
encoder (of type format('a)): Encoder to use (most likely a %ffmpeg encoder)
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Audio Processing

`add`

Mix sources, with optional normalization. Only relay metadata from the first source that is effectively summed.

Type:

(?id : string?, ?normalize : {bool}, ?power : {bool},
 ?weights : [{float}],
 [source(audio=internal('a), video=internal('b),
  midi=internal('c))]) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
normalize (of type {bool}, which defaults to true): Divide by the sum of weights of ready sources (or by the number of ready sources if weights are not specified).
power (of type {bool}, which defaults to false): Perform constant-power normalization.
weights (of type [{float}], which defaults to []): Relative weight of the sources in the sum. The empty list stands for the homogeneous distribution. These are used as amplification coefficients if we are not normalizing.
(unlabeled) (of type [source(audio=internal('a), video=internal('b), midi=internal('c))])

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`amplify`

Multiply the amplitude of the signal.

Type:

(?id : string?, ?override : string?, {float},
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
override (of type string?, which defaults to "liq_amplify"): Specify the name of a metadata field that, when present and well-formed, overrides the amplification factor for the current track. Well-formed values are floats in decimal notation (e.g. 0.7) which are taken as normal/linear multiplicative factors; values can be passed in decibels with the suffix dB (e.g. -8.2 dB, but the spaces do not matter).
(unlabeled) (of type {float}): Multiplicative factor.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`audio.map`

Map a function to all audio samples. This is SLOW!

Type:

(?id : string?, ((float) -> float), source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type (float) -> float)
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`clip`

Clip samples, i.e. ensure that all values are between -1 and 1: values lower than -1 become -1 and values higher than 1 become 1. nan values become 0.

Type:

(?id : string?, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`comb`

Comb filter.

Type:

(?id : string?, ?delay : float, ?feedback : {float},
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
delay (of type float, which defaults to 0.001): Delay in seconds.
feedback (of type {float}, which defaults to -6.): Feedback coefficient in dB.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`compand`

Compand the signal.

Type:

(?id : string?, ?mu : float, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
mu (of type float, which defaults to 1.)
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`compress`

Compress the signal.

Type:

(?id : string?, ?attack : {float}, ?gain : {float},
 ?knee : {float}, ?lookahead : {float},
 ?pre_gain : {float}, ?ratio : {float},
 ?release : {float}, ?threshold : {float},
 ?track_sensitive : bool, ?wet : {float},
 ?window : {float}, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type {float}, which defaults to 50.): Attack time (ms).
gain (of type {float}, which defaults to 0.): Post-amplification (dB).
knee (of type {float}, which defaults to 1.): Knee width (dB).
lookahead (of type {float}, which defaults to 0.): Lookahead (ms).
pre_gain (of type {float}, which defaults to 0.): Pre-amplification (dB).
ratio (of type {float}, which defaults to 2.): Gain reduction ratio (reduction is ratio:1).
release (of type {float}, which defaults to 400.): Release time (ms).
threshold (of type {float}, which defaults to -10.): Threshold level (dB).
track_sensitive (of type bool, which defaults to false): Reset on every track.
wet (of type {float}, which defaults to 1.): How much of input sound to output (between 0 and 1, 0 means only original sound, 1 means only compressed sound).
window (of type {float}, which defaults to 0.): RMS window length (second). 0. means peak mode.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gain (of type () -> float): Gain (dB).
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): RMS or peak power (linear).
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`compress.exponential`

Exponential compressor.

Type:

(?id : string?, ?mu : float, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
mu (of type float, which defaults to 2.): Exponential compression factor, typically greater than 1.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`compress.old`

Compress the signal.

Type:

(?id : string?, ?attack : {float}, ?gain : {float},
 ?knee : {float}, ?ratio : {float}, ?release : {float},
 ?threshold : {float}, ?window : float,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type {float}, which defaults to 100.): Attack time (ms).
gain (of type {float}, which defaults to 0.): Additional gain (dB).
knee (of type {float}, which defaults to 1.): Knee radius (dB).
ratio (of type {float}, which defaults to 2.): Gain reduction ratio (n:1).
release (of type {float}, which defaults to 400.): Release time (ms).
threshold (of type {float}, which defaults to -10.): Threshold level (dB).
window (of type float, which defaults to 0.1): Window for computing RMS (in sec).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`cross`

Cross operator, allowing the composition of the n last seconds of a track with the beginning of the next track, using a transition function depending on the relative power of the signal before and after the end of track.

Type:

(?id : string?, ?active : bool, ?conservative : bool,
 ?duration : {float}, ?minimum : float,
 ?override_duration : string, ?width : float,
 ((
   {
     db_level : float,
     metadata : [string * string],
     source : source(audio=pcm('a),
     video='b,
     midi='c)
   }, 
   {
     db_level : float,
     metadata : [string * string],
     source : source(audio=pcm('a),
     video='b,
     midi='c)
   }) -> source(audio=pcm('a), video='b, midi='c)),
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
active (of type bool, which defaults to false): The active behavior is to keep ticking the child’s clock when the operator is not streaming. Otherwise the child’s clock is strictly based on what is streamed off the child source, which results in time-dependent active sources to be frozen when that source is stopped.
conservative (of type bool, which defaults to true): Do not trust remaining time estimations, always buffering data in advance. This avoids being tricked by skips, either manual or caused by blank.skip().
duration (of type {float}, which defaults to 5.): Duration (in seconds) of buffered data from each track that is used to compute the transition between tracks.
minimum (of type float, which defaults to -1.): Minimum duration (in sec.) for a cross: If the track ends without any warning (e.g. in case of skip) there may not be enough data for a decent composition. Set to 0. to avoid having transitions after skips, or more to avoid transitions on short tracks. With a negative default, transitions always occur.
override_duration (of type string, which defaults to "liq_cross_duration"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
width (of type float, which defaults to 2.): Width of the power computation window.
(unlabeled) (of type ( { db_level : float, metadata : [string * string], source : source(audio=pcm('a), video='b, midi='c) }, { db_level : float, metadata : [string * string], source : source(audio=pcm('a), video='b, midi='c) }) -> source(audio=pcm('a), video='b, midi='c)): Transition function, composing from the end of a track and the next track. The sources corresponding to the two tracks are decorated with fields indicating the power of the signal before and after the transition (power), and the metadata (metadata).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`delay_line`

Delay the audio signal by a given amount of time.

Type:

(?id : string?, {float}, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type {float}): Duration of the delay in seconds.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`dtmf.detect`

Detect DTMF tones.

Type:

(?id : string?, ?bands : int, ?debug : {bool},
 ?duration : {float}, ?smoothing : {float},
 ?threshold : {float}, source(audio=pcm('a), video='b,
 midi='c), ((string) -> unit)) -> source(audio=pcm('a),
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bands (of type int, which defaults to 1024): Number of frequency bands.
debug (of type {bool}, which defaults to false): Show internal values on standard output in order to fine-tune parameters: band number, band frequency, detected intensity and smoothed intensity.
duration (of type {float}, which defaults to 0.05): Duration for detecting a tone.
smoothing (of type {float}, which defaults to 0.01): Smoothing time (in seconds) for band indensity (the higher, the less sensitive we are to local variations, but the more time we take to detect a band).
threshold (of type {float}, which defaults to 50.): Threshold for detecting a band.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): Source on which DTMF tones should be detected.
(unlabeled) (of type (string) -> unit): Function called with detected key as argument.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`echo`

Add echo.

Type:

(?id : string?, ?delay : {float}, ?feedback : {float},
 ?ping_pong : bool, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
delay (of type {float}, which defaults to 0.5): Delay in seconds.
feedback (of type {float}, which defaults to -6.): Feedback coefficient in dB (negative).
ping_pong (of type bool, which defaults to false): Use ping-pong delay.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.filter.audio.output`

Return an audio source from a filter’s output

Type:

(?id : string?, ?pass_metadata : bool,
 ffmpeg.filter.graph, ffmpeg.filter.audio) ->
source(audio=ffmpeg.audio.raw('a), video=none, midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
pass_metadata (of type bool, which defaults to true): Pass ffmpeg stream metadata to liquidsoap
(unlabeled) (of type ffmpeg.filter.graph)
(unlabeled) (of type ffmpeg.filter.audio)

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter`

Perform several kinds of filtering on the signal. Only frequencies below the sampling rate / 4 (generally 10 kHz) are handled well for the freq parameter.

Type:

(?id : string?, freq : {float}, mode : string,
 ?q : {float}, ?wetness : {float}, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
freq (of type {float}): Characteristic frequency of the filter.
mode (of type string): Available modes are ‘low’ (for low-pass filter), ‘high’ (for high-pass filter), ‘band’ (for band-pass filter) and ‘notch’ (for notch / band-stop / band-rejection filter).
q (of type {float}, which defaults to 1.)
wetness (of type {float}, which defaults to 1.): How much of the original signal should be added (1. means only filtered and 0. means only original signal).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.fir`

Low-pass FIR filter.

Type:

(?id : string?, beta : float, ?coeffs : int,
 frequency : float, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
beta (of type float): Beta should range between 0 and 1.
coeffs (of type int, which defaults to 255): Number of coefficients
frequency (of type float): Corner frequency in Hz (frequency at which the response is 0.5, that is -6 dB).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.butterworth.bandpass`

IIR filter

Type:

(?id : string?, frequency1 : float, frequency2 : float,
 ?order : int, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency1 (of type float): First corner frequency
frequency2 (of type float): Second corner frequency
order (of type int, which defaults to 4): Filter order
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.butterworth.bandstop`

IIR filter

Type:

(?id : string?, frequency1 : float, frequency2 : float,
 ?order : int, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency1 (of type float): First corner frequency
frequency2 (of type float): Second corner frequency
order (of type int, which defaults to 4): Filter order
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.butterworth.high`

IIR filter

Type:

(?id : string?, frequency : float, ?order : int,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type float): Corner frequency
order (of type int, which defaults to 4): Filter order
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.butterworth.low`

IIR filter

Type:

(?id : string?, frequency : float, ?order : int,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type float): Corner frequency
order (of type int, which defaults to 4): Filter order
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.allpass`

All-pass biquad filter.

Type:

(?id : string?, ?bandwidth : {float},
 frequency : {float}, source(audio='a, video='b,
 midi='c)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bandwidth (of type {float}, which defaults to 0.333333333333): Bandwidth (in octaves)
frequency (of type {float}): Center frequency
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.bandpass`

Band-pass biquad filter.

Type:

(?id : string?, frequency : {float}, ?q : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Center frequency
q (of type {float}, which defaults to 1.): Q
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.high`

High-pass biquad filter.

Type:

(?id : string?, frequency : {float}, ?q : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Corner frequency
q (of type {float}, which defaults to 1.): Q
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.highshelf`

High shelf biquad filter.

Type:

(?id : string?, frequency : {float}, ?slope : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Center frequency
slope (of type {float}, which defaults to 1.): Shelf slope (in dB/octave)
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.low`

Low-pass biquad filter.

Type:

(?id : string?, frequency : {float}, ?q : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Corner frequency
q (of type {float}, which defaults to 1.): Q
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.lowshelf`

Low shelf biquad filter.

Type:

(?id : string?, frequency : {float}, ?slope : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Corner frequency
slope (of type {float}, which defaults to 1.): Shelf slope (dB/octave)
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.notch`

Band-pass biquad filter.

Type:

(?id : string?, frequency : {float}, ?q : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Center frequency
q (of type {float}, which defaults to 1.): Q
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.peak`

Peak EQ biquad filter.

Type:

(?id : string?, frequency : {float}, ?gain : {float},
 ?q : {float}, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Center frequency
gain (of type {float}, which defaults to 1.): Gain (in dB)
q (of type {float}, which defaults to 1.): Q
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.resonator.allpass`

IIR filter

Type:

(?id : string?, frequency : float, ?q : float,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type float): Corner frequency
q (of type float, which defaults to 60.): Quality factor
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.resonator.bandpass`

IIR filter

Type:

(?id : string?, frequency : float, ?q : float,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type float): Corner frequency
q (of type float, which defaults to 60.): Quality factor
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.resonator.bandstop`

IIR filter

Type:

(?id : string?, frequency : float, ?q : float,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type float): Corner frequency
q (of type float, which defaults to 60.): Quality factor
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.rc`

First-order filter (RC filter).

Type:

(?id : string?, frequency : {float}, mode : string,
 ?wetness : {float}, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
frequency (of type {float}): Cutoff frequency.
mode (of type string): Available modes are ‘low’ (for low-pass filter), ‘high’ (for high-pass filter).
wetness (of type {float}, which defaults to 1.): How much of the original signal should be added (1. means only filtered and 0. means only original signal).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`flanger`

Flanger effect.

Type:

(?id : string?, ?delay : float, ?feedback : {float},
 ?freq : {float}, ?phase : {float}, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
delay (of type float, which defaults to 0.001): Delay in seconds.
feedback (of type {float}, which defaults to 0.): Feedback coefficient in dB.
freq (of type {float}, which defaults to 0.5): Frequency in Hz.
phase (of type {float}, which defaults to 1.): Phase difference between channels in radians.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`gate`

Reduce the volume when the stream is silent (typically in order to avoid low intensity noise).

Type:

(?id : string?, ?attack : {float}, ?hold : {float},
 ?range : {float}, ?release : {float},
 ?threshold : {float}, ?window : {float},
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type {float}, which defaults to 10.): Time to fully open the gate (ms).
hold (of type {float}, which defaults to 1000.): Minimum amount of time the gate stays open (ms).
range (of type {float}, which defaults to -30.): Difference between closed and open level (dB).
release (of type {float}, which defaults to 2000.): Time to fully close the gate (ms).
threshold (of type {float}, which defaults to -30.): Threshold at which the gate will open (dB).
window (of type {float}, which defaults to 1.): Duration for computing peak (ms).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gate (of type () -> float): Position of the gate (0. means closed, 1. means open).
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`normalize.old`

Normalize the signal. Dynamic normalization of the signal is sometimes the only option, and can make a listening experience much nicer. However, its dynamic aspect implies some limitations which can go as far as creating saturation in some extreme cases. If possible, consider using some track-based normalization techniques such as those based on replay gain. See the documentation for more details. This is the implementation provided in Liquidsoap < 2.0. A new, better and more customizable one is now given in normalize.

Type:

(?id : string?, ?gain_max : {float}, ?gain_min : {float},
 ?k_down : {float}, ?k_up : {float}, ?target : {float},
 ?threshold : {float}, ?track_sensitive : bool,
 ?window : float, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
gain_max (of type {float}, which defaults to 6.): Maximal gain value (dB).
gain_min (of type {float}, which defaults to -6.): Minimal gain value (dB).
k_down (of type {float}, which defaults to 0.1): Coefficient when the power must go down (between 0 and 1, slowest to fastest).
k_up (of type {float}, which defaults to 0.005): Coefficient when the power must go up (between 0 and 1, slowest to fastest).
target (of type {float}, which defaults to -13.): Desired RMS (dB).
threshold (of type {float}, which defaults to -40.): Minimal RMS for activaing gain control (dB).
track_sensitive (of type bool, which defaults to true): Reset values on every track.
window (of type float, which defaults to 0.1): Duration of the window used to compute the current RMS power (second).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gain (of type () -> float): Current amplification coefficient.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): Current RMS.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`peak`

Get current peak volume of the source. Returns the source with a method peak to compute the current peak volume of the source, with 0.0 <= peak volume <= 1.0.

Type:

(?id : string?, ?duration : {float},
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to 0.5): Duration of the window (in seconds). A value <= 0, means that computation should not be performed.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
peak (of type () -> float): Current value for the peak volume.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`peak.stereo`

Get current peak volume of the source. Returns the source with a method peak to compute the current peak volume of the source, with 0.0 <= peak volume <= 1.0.

Type:

(?id : string?, ?duration : {float},
 source(audio=pcm(stereo), video='a, midi='b)) ->
source(audio=pcm(stereo), video='a, midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to 0.5): Duration of the window (in seconds). A value <= 0, means that computation should not be performed.
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
peak (of type () -> float * float): Current value for the peak volume.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`pipe`

Process audio signal through a given process stdin/stdout.

Type:

(?id : string?, ?buffer : float, ?data_length : int?,
 ?log_overfull : bool, ?max : float, process : string,
 ?replay_delay : float?, ?restart : bool,
 ?restart_on_error : bool, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 1.): Duration of the pre-buffered data.
data_length (of type int?, which defaults to null): Length passed in the WAV data chunk. Data is streamed so no the consuming program should process it as it comes. Some program operate better when this value is set to 0, some other when it is set to the maximum length allowed by the WAV specs. Use any negative value to set to maximum length.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max (of type float, which defaults to 10.): Maximum duration of the buffered data.
process (of type string): Process used to pipe data to.
replay_delay (of type float?, which defaults to null): Replay track marks and metadata from the input source on the output after a given delay. If null (default) close and flush the process on each track and metadata to get an exact timing. This parameter is typically used when integrating with stereotool.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to true): Restart process when exited with error.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`rms`

Get current RMS volume of the source. Returns the source with a method rms to compute the current RMS volume of the source, with 0.0 <= RMS volume <= 1.0.

Type:

(?id : string?, ?duration : {float},
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to 0.5): Duration of the window (in seconds). A value <= 0, means that computation should not be performed.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): Current value for the RMS volume.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`rms.stereo`

Get current RMS volume of the source. Returns the source with a method rms to compute the current RMS volume of the source, with 0.0 <= RMS volume <= 1.0.

Type:

(?id : string?, ?duration : {float},
 source(audio=pcm(stereo), video='a, midi='b)) ->
source(audio=pcm(stereo), video='a, midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to 0.5): Duration of the window (in seconds). A value <= 0, means that computation should not be performed.
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float * float): Current value for the RMS volume.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`sine.detect`

Detect sine waves.

Type:

(?id : string?, ?bands : int, ?debug : {bool},
 ?duration : {float}, ?smoothing : {float},
 ?threshold : {float}, [float], source(audio=pcm('a),
 video='b, midi='c), ((float) -> unit)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bands (of type int, which defaults to 1024): Number of frequency bands.
debug (of type {bool}, which defaults to false): Show internal values on standard output in order to fine-tune parameters: band number, band frequency, detected intensity and smoothed intensity.
duration (of type {float}, which defaults to 0.5): Duration for detecting a tone.
smoothing (of type {float}, which defaults to 0.01): Smoothing time (in seconds) for band indensity (the higher, the less sensitive we are to local variations, but the more time we take to detect a band).
threshold (of type {float}, which defaults to 50.): Threshold for detecting a band.
(unlabeled) (of type [float]): List of frequencies to detect.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): Source on which sines should be detected.
(unlabeled) (of type (float) -> unit): Function called with detected frequency as argument.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`soundtouch`

Change the rate, the tempo or the pitch of the sound.

Type:

(?id : string?, ?pitch : {float}, ?rate : {float},
 ?tempo : {float}, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
pitch (of type {float}, which defaults to 1.)
rate (of type {float}, which defaults to 1.)
tempo (of type {float}, which defaults to 1.)
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`stereo.ms.decode`

Decode mid+side stereo (M/S) to left+right stereo.

Type:

(?id : string?, ?width : float, source(audio=pcm(stereo),
 video='a, midi='b)) -> source(audio=pcm(stereo),
video='a, midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
width (of type float, which defaults to 1.): Width of the stereo field.
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`stereo.ms.encode`

Encode left+right stereo to mid+side stereo (M/S).

Type:

(?id : string?, source(audio=pcm(stereo), video='a,
 midi='b)) -> source(audio=pcm(stereo), video='a,
midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`stereo.pan`

Pan a stereo sound.

Type:

(?id : string?, ?field : {float}, ?pan : {float},
 source(audio=pcm(stereo), video='a, midi='b)) ->
source(audio=pcm(stereo), video='a, midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
field (of type {float}, which defaults to 90.): Field width in degrees (between 0 and 90).
pan (of type {float}, which defaults to 0.): Pan ranges between -1 and 1.
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`stereo.width`

Spacializer which allows controlling the width of the signal.

Type:

(?id : string?, ?{float}, source(audio=pcm(stereo),
 video='a, midi='b)) -> source(audio=pcm(stereo),
video='a, midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type {float}, which defaults to 0.): Width of the signal (-1: mono, 0.: original, 1.: wide stereo).
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`stretch`

Slow down or accelerate an audio stream by stretching (sounds lower) or squeezing it (sounds higher).

Type:

(?id : string?, ratio : {float}, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
ratio (of type {float}): A value higher than 1 means slowing down.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Conversion

`audio_to_stereo`

Convert any pcm audio source into a stereo source.

Type:

(?id : string?, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm(stereo), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`drop_audio`

Drop all audio content of a stream.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio=none, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`drop_midi`

Drop all midi content of a stream.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`drop_video`

Drop all video content of a stream.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video=none, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.decode.audio`

Convert a source’s content

Type:

(?id : string?, source(audio=ffmpeg.audio.copy('a),
 video=none, midi=none)) -> source(audio=pcm('b),
video=none, midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=ffmpeg.audio.copy('a), video=none, midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.decode.audio_video`

Convert a source’s content

Type:

(?id : string?, source(audio=ffmpeg.audio.copy('a),
 video=ffmpeg.video.copy('b), midi=none)) ->
source(audio=pcm('c), video=canvas('d), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=ffmpeg.audio.copy('a), video=ffmpeg.video.copy('b), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.decode.video`

Convert a source’s content

Type:

(?id : string?, source(audio=none,
 video=ffmpeg.video.copy('a), midi=none)) ->
source(audio=none, video=canvas('b), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=none, video=ffmpeg.video.copy('a), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.encode.audio`

Convert a source’s content

Type:

(?id : string?, format(audio=pcm('a), video=none,
 midi=none), source(audio=pcm('a), video=none,
 midi=none)) -> source(audio=ffmpeg.audio.copy('b),
video=none, midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type format(audio=pcm('a), video=none, midi=none)): Encoding format.
(unlabeled) (of type source(audio=pcm('a), video=none, midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.encode.audio_video`

Convert a source’s content

Type:

(?id : string?, format(audio=pcm('a), video=canvas('b),
 midi=none), source(audio=pcm('a), video=canvas('b),
 midi=none)) -> source(audio=ffmpeg.audio.copy('c),
video=ffmpeg.video.copy('d), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type format(audio=pcm('a), video=canvas('b), midi=none)): Encoding format.
(unlabeled) (of type source(audio=pcm('a), video=canvas('b), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.encode.video`

Convert a source’s content

Type:

(?id : string?, format(audio=none, video=canvas('a),
 midi=none), source(audio=none, video=canvas('a),
 midi=none)) -> source(audio=none,
video=ffmpeg.video.copy('b), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type format(audio=none, video=canvas('a), midi=none)): Encoding format.
(unlabeled) (of type source(audio=none, video=canvas('a), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.raw.decode.audio`

Convert a source’s content

Type:

(?id : string?, source(audio=ffmpeg.audio.raw('a),
 video=none, midi=none)) -> source(audio=pcm('b),
video=none, midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=ffmpeg.audio.raw('a), video=none, midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.raw.decode.audio_video`

Convert a source’s content

Type:

(?id : string?, source(audio=ffmpeg.audio.raw('a),
 video=ffmpeg.video.raw('b), midi=none)) ->
source(audio=pcm('c), video=canvas('d), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=ffmpeg.audio.raw('a), video=ffmpeg.video.raw('b), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.raw.decode.video`

Convert a source’s content

Type:

(?id : string?, source(audio=none,
 video=ffmpeg.video.raw('a), midi=none)) ->
source(audio=none, video=canvas('b), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=none, video=ffmpeg.video.raw('a), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.raw.encode.audio`

Convert a source’s content

Type:

(?id : string?, format(audio=ffmpeg.audio.raw('a),
 video=none, midi=none), source(audio=pcm('b),
 video=none, midi=none)) ->
source(audio=ffmpeg.audio.raw('a), video=none, midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type format(audio=ffmpeg.audio.raw('a), video=none, midi=none)): Encoding format.
(unlabeled) (of type source(audio=pcm('b), video=none, midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.raw.encode.audio_video`

Convert a source’s content

Type:

(?id : string?, format(audio=ffmpeg.audio.raw('a),
 video=ffmpeg.video.raw('b), midi=none),
 source(audio=pcm('c), video=canvas('d), midi=none)) ->
source(audio=ffmpeg.audio.raw('a),
video=ffmpeg.video.raw('b), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type format(audio=ffmpeg.audio.raw('a), video=ffmpeg.video.raw('b), midi=none)): Encoding format.
(unlabeled) (of type source(audio=pcm('c), video=canvas('d), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`ffmpeg.raw.encode.video`

Convert a source’s content

Type:

(?id : string?, format(audio=none,
 video=ffmpeg.video.raw('a), midi=none),
 source(audio=none, video=canvas('b), midi=none)) ->
source(audio=none, video=ffmpeg.video.raw('a), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type format(audio=none, video=ffmpeg.video.raw('a), midi=none)): Encoding format.
(unlabeled) (of type source(audio=none, video=canvas('b), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`mean`

Produce mono audio by taking the mean of all audio channels.

Type:

(?id : string?, ?normalize : bool, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm(mono), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
normalize (of type bool, which defaults to true): Divide the output volume by the number of channels.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): Source whose mean should be computed.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`mux_audio`

Mux an audio stream into an audio-free stream. Track marks and metadata are taken from both sources.

Type:

(?id : string?, audio : source(audio='a, video=none,
 midi=none), source(audio=none, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
audio (of type source(audio='a, video=none, midi=none))
(unlabeled) (of type source(audio=none, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`mux_video`

Add video channels to a stream. Track marks and metadata are taken from both sources.

Type:

(?id : string?, video : source(audio=none, video='a,
 midi=none), source(audio='b, video=none, midi='c)) ->
source(audio='b, video='a, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
video (of type source(audio=none, video='a, midi=none))
(unlabeled) (of type source(audio='b, video=none, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`swap`

Swap two channels of a stereo source.

Type:

(?id : string?, source(audio=pcm(stereo), video='a,
 midi='b)) -> source(audio=pcm(stereo), video='a,
midi='b)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Conversions

`stereo.left`

Extract the left channel of a stereo source

Type:

(source(audio=pcm(stereo), video='a, midi='b)) ->
source(audio=pcm(mono), video='a, midi='b)

Arguments:

(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b)): Source to extract from

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`stereo.right`

Extract the right channel of a stereo source

Type:

(source(audio=pcm(stereo), video='a, midi='b)) ->
source(audio=pcm(mono), video='a, midi='b)

Arguments:

(unlabeled) (of type source(audio=pcm(stereo), video='a, midi='b)): Source to extract from

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / FFmpeg Filter

Source / Input

`blank`

Produce silence and blank images.

Type:

(?id : string?, ?duration : float) ->
source(audio=internal('a), video=internal('b),
midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float, which defaults to -1.): Duration of blank tracks in seconds, Negative value means forever.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.alsa`

Stream from an ALSA input device.

Type:

(?id : string?, ?bufferize : bool, ?clock_safe : bool,
 ?device : string, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bufferize (of type bool, which defaults to true): Bufferize input
clock_safe (of type bool, which defaults to true): Force the use of a dedicated clock
device (of type string, which defaults to "default"): Alsa device to use
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.external.avi`

Stream data from an external application.

Type:

(?id : string?, ?buffer : float, ?log_overfull : bool,
 ?max : float, ?restart : bool, ?restart_on_error : bool,
 string) -> source(audio=pcm('a), video=canvas('b),
midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 1.): Duration of the pre-buffered data.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max (of type float, which defaults to 10.): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
(unlabeled) (of type string): Command to execute.

Methods:

buffer_length (of type () -> float * float * float): Length of the buffer (in seconds).
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`input.external.rawaudio`

Stream raw PCM data (interleaved signed 16 bits little endian integers) from an external application.

Type:

(?id : string?, ?buffer : float, ?channels : int,
 ?log_overfull : bool, ?max : float, ?restart : bool,
 ?restart_on_error : bool, ?samplerate : int, string) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 2.): Duration of the pre-buffered data.
channels (of type int, which defaults to 2): Number of channels.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max (of type float, which defaults to 10.): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
samplerate (of type int, which defaults to 44100): Samplerate.
(unlabeled) (of type string): Command to execute.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.external.rawvideo`

Stream data from an external application.

Type:

(?id : string?, ?buffer : float, ?log_overfull : bool,
 ?max : float, ?restart : bool, ?restart_on_error : bool,
 string) -> source(audio='a, video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 1.): Duration of the pre-buffered data.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max (of type float, which defaults to 10.): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
(unlabeled) (of type string): Command to execute.

Methods:

buffer_length (of type () -> float * float * float): Length of the buffer (in seconds).
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`input.external.wav`

Stream WAV data from an external application.

Type:

(?id : string?, ?buffer : float, ?log_overfull : bool,
 ?max : float, ?restart : bool, ?restart_on_error : bool,
 string) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 2.): Duration of the pre-buffered data.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max (of type float, which defaults to 10.): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
(unlabeled) (of type string): Command to execute.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.ffmpeg`

Create a stream using ffmpeg

Type:

(?id : string?, ?clock_safe : bool, ?debug : bool,
 ?float_args : [string * float], ?format : string?,
 ?int_args : [string * int], ?log_overfull : bool,
 ?max_buffer : float, ?new_track_on_metadata : bool,
 ?on_connect : (() -> unit),
 ?on_disconnect : (() -> unit), ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?poll_delay : float,
 ?self_sync : bool, ?start : bool,
 ?string_args : [string * string], {string}) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
clock_safe (of type bool, which defaults to false): Force the use of a dedicated clock
debug (of type bool, which defaults to false): Run in debugging mode, not catching some exceptions.
float_args (of type [string * float], which defaults to [])
format (of type string?, which defaults to null): Force a specific input format. Autodetected when passed a null argument
int_args (of type [string * int], which defaults to [])
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max_buffer (of type float, which defaults to 5.): Maximum uration of buffered data
new_track_on_metadata (of type bool, which defaults to true): Treat new metadata as new track.
on_connect (of type () -> unit, which defaults to <fun>): Function to execute when a source is connected.
on_disconnect (of type () -> unit, which defaults to <fun>): Function to excecute when a source is disconnected
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
poll_delay (of type float, which defaults to 2.): Polling delay when trying to connect to the stream.
self_sync (of type bool, which defaults to false): Should the source control its own timing? Set to true if you are having synchronization issues. Should be false for most typical cases.
start (of type bool, which defaults to true): Start input as soon as it is available.
string_args (of type [string * string], which defaults to [])
(unlabeled) (of type {string}): URL to decode.

Methods:

buffer_length (of type () -> float): Get the buffer’s length in seconds.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source’s url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either “stopped” (the source isn’t trying to relay the HTTP stream), “polling” (attempting to connect to the HTTP stream) or “connected ” (connected to , buffering or playing back the stream).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.
url (of type () -> string): Return the source’s current url.

`input.harbor`

Create a source that receives a http/icecast stream and forwards it as a stream.

Type:

(?id : string?,
 ?auth : ((
           {
             address : string,
             password : string,
             user : string
           }) -> bool)?,
 ?buffer : float, ?debug : bool, ?dumpfile : string?,
 ?icy : bool, ?icy_metadata_charset : string?,
 ?log_overfull : bool, ?logfile : string?, ?max : float,
 ?metadata_charset : string?,
 ?on_connect : (([string * string]) -> unit),
 ?on_disconnect : (() -> unit), ?password : string,
 ?port : int, ?replay_metadata : bool, ?timeout : float,
 ?user : string, string) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
auth (of type (({address : string, password : string, user : string}) -> bool)?, which defaults to null): Authentication function. Receives a record with: user, password and address (client network address) and returns true if the user should be granted access for this login. Override any other method if used.
buffer (of type float, which defaults to 12.): Duration of the pre-buffered data. Default value is set to make it possible to use crossfade transitions with input.harbor. You might be able to reduce it but, in this case, make sure to not use the operator with crossfade or make sure that it has enough buffered data for it.
debug (of type bool, which defaults to false): Run in debugging mode by not catching some exceptions.
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
icy (of type bool, which defaults to false): Enable ICY (shoutcast) protocol.
icy_metadata_charset (of type string?, which defaults to null): ICY (shoutcast) metadata charset. Guessed if null. Default for shoutcast is ISO-8859-1. Set to that value if all your clients send metadata using this charset and automatic detection is not working for you.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
logfile (of type string?, which defaults to null): Log buffer status to file, for debugging purpose. Disabled if null.
max (of type float, which defaults to 20.): Maximum duration of the buffered data.
metadata_charset (of type string?, which defaults to null): Metadata charset for non-ICY (shoutcast) source protocols. Guessed if null.
on_connect (of type ([string * string]) -> unit, which defaults to <fun>): Function to execute when a source is connected. Its receives the list of headers, of the form: (,). All labels are lowercase.
on_disconnect (of type () -> unit, which defaults to <fun>): Functions to execute when a source is disconnected
password (of type string, which defaults to "hackme"): Source password.
port (of type int, which defaults to 8005): Port used to connect to the source.
replay_metadata (of type bool, which defaults to false): Replay last known metadata when switching back to this source. This helps when source has dropped due to temporary connection issues.
timeout (of type float, which defaults to 30.): Timeout for source connectionn.
user (of type string, which defaults to "source"): Source user.
(unlabeled) (of type string): Mountpoint to look for.

Methods:

buffer_length (of type () -> float): Length of the buffer (in seconds).
connected_client (of type () -> string?): Returns the address of the client currently connected, if there is one.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
status (of type () -> string): Current status of the input.
stop (of type () -> unit): Stop the input.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.harbor.ssl`

Retrieves the given https stream from the harbor.

Type:

(?id : string?,
 ?auth : ((
           {
             address : string,
             password : string,
             user : string
           }) -> bool)?,
 ?buffer : float, ?debug : bool, ?dumpfile : string?,
 ?icy : bool, ?icy_metadata_charset : string?,
 ?log_overfull : bool, ?logfile : string?, ?max : float,
 ?metadata_charset : string?,
 ?on_connect : (([string * string]) -> unit),
 ?on_disconnect : (() -> unit), ?password : string,
 ?port : int, ?replay_metadata : bool, ?timeout : float,
 ?user : string, string) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
auth (of type (({address : string, password : string, user : string}) -> bool)?, which defaults to null): Authentication function. Receives a record with: user, password and address (client network address) and returns true if the user should be granted access for this login. Override any other method if used.
buffer (of type float, which defaults to 12.): Duration of the pre-buffered data. Default value is set to make it possible to use crossfade transitions with input.harbor. You might be able to reduce it but, in this case, make sure to not use the operator with crossfade or make sure that it has enough buffered data for it.
debug (of type bool, which defaults to false): Run in debugging mode by not catching some exceptions.
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
icy (of type bool, which defaults to false): Enable ICY (shoutcast) protocol.
icy_metadata_charset (of type string?, which defaults to null): ICY (shoutcast) metadata charset. Guessed if null. Default for shoutcast is ISO-8859-1. Set to that value if all your clients send metadata using this charset and automatic detection is not working for you.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
logfile (of type string?, which defaults to null): Log buffer status to file, for debugging purpose. Disabled if null.
max (of type float, which defaults to 20.): Maximum duration of the buffered data.
metadata_charset (of type string?, which defaults to null): Metadata charset for non-ICY (shoutcast) source protocols. Guessed if null.
on_connect (of type ([string * string]) -> unit, which defaults to <fun>): Function to execute when a source is connected. Its receives the list of headers, of the form: (,). All labels are lowercase.
on_disconnect (of type () -> unit, which defaults to <fun>): Functions to execute when a source is disconnected
password (of type string, which defaults to "hackme"): Source password.
port (of type int, which defaults to 8005): Port used to connect to the source.
replay_metadata (of type bool, which defaults to false): Replay last known metadata when switching back to this source. This helps when source has dropped due to temporary connection issues.
timeout (of type float, which defaults to 30.): Timeout for source connectionn.
user (of type string, which defaults to "source"): Source user.
(unlabeled) (of type string): Mountpoint to look for.

Methods:

buffer_length (of type () -> float): Length of the buffer (in seconds).
connected_client (of type () -> string?): Returns the address of the client currently connected, if there is one.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
status (of type () -> string): Current status of the input.
stop (of type () -> unit): Stop the input.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.hls`

Play an HLS stream.

Type:

(?id : string?, {string}) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type {string}): Playlist URI.

Methods:

buffer_length (of type () -> float): Get the buffer’s length in seconds.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source’s url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either “stopped” (the source isn’t trying to relay the HTTP stream), “polling” (attempting to connect to the HTTP stream) or “connected ” (connected to , buffering or playing back the stream).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.
url (of type () -> string): Return the source’s current url.

`input.hls.native`

Play an HLS stream.

Type:

(?id : string?, ?reload : float, string) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
reload (of type float, which defaults to 10.): How often (in seconds) the playlist should be reloaded.
(unlabeled) (of type string): Playlist URI.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`input.http`

Create a http stream using ffmpeg

Type:

(?id : string?, ?clock_safe : bool, ?debug : bool,
 ?float_args : [string * float], ?format : string?,
 ?int_args : [string * int], ?log_overfull : bool,
 ?max_buffer : float, ?new_track_on_metadata : bool,
 ?on_connect : (([string * string]) -> unit),
 ?on_disconnect : (() -> unit), ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?poll_delay : float,
 ?self_sync : bool, ?start : bool,
 ?string_args : [string * string], ?timeout : float,
 ?user_agent : string, {string}) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
clock_safe (of type bool, which defaults to false): Force the use of a dedicated clock
debug (of type bool, which defaults to false): Run in debugging mode, not catching some exceptions.
float_args (of type [string * float], which defaults to [])
format (of type string?, which defaults to null): Force a specific input format. Autodetected when passed a null argument
int_args (of type [string * int], which defaults to [])
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max_buffer (of type float, which defaults to 5.): Maximum uration of buffered data
new_track_on_metadata (of type bool, which defaults to true): Treat new metadata as new track.
on_connect (of type ([string * string]) -> unit, which defaults to <fun>): Function to execute when a source is connected. Its receives the list of ICY-specific headers, if available.
on_disconnect (of type () -> unit, which defaults to <fun>): Function to excecute when a source is disconnected
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
poll_delay (of type float, which defaults to 2.): Polling delay when trying to connect to the stream.
self_sync (of type bool, which defaults to false): Should the source control its own timing? Set to true if you are having synchronization issues. Should be false for most typical cases.
start (of type bool, which defaults to true): Start input as soon as it is available.
string_args (of type [string * string], which defaults to [])
timeout (of type float, which defaults to 10.): Timeout for source connection.
user_agent (of type string, which defaults to "Liquidsoap/2.1.0 (Unix; OCaml 4.14.0)"): User agent.
(unlabeled) (of type {string}): URL to decode.

Methods:

buffer_length (of type () -> float): Get the buffer’s length in seconds.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source’s url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either “stopped” (the source isn’t trying to relay the HTTP stream), “polling” (attempting to connect to the HTTP stream) or “connected ” (connected to , buffering or playing back the stream).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.
url (of type () -> string): Return the source’s current url.

`input.jack`

Get stream from jack.

Type:

(?id : string?, ?buffer_size : int, ?clock_safe : bool,
 ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?server : string,
 ?start : bool) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer_size (of type int, which defaults to 2): Set buffer size, in frames. Must be >= 1.
clock_safe (of type bool, which defaults to true): Force the use of a dedicated clock
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
server (of type string, which defaults to ""): Jack server to connect to.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.keyboard.sdl`

Play notes from the keyboard.

Type:

(?id : string?, ?velocity : float) -> source(audio='a,
video='b, midi=midi('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
velocity (of type float, which defaults to 0.8): Velocity of notes.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`input.oss`

Stream from an OSS input device.

Type:

(?id : string?, ?clock_safe : bool, ?device : string,
 ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?start : bool) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
clock_safe (of type bool, which defaults to true): Force the use of a dedicated clock
device (of type string, which defaults to "/dev/dsp"): OSS device to use.
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.portaudio`

Stream from a portaudio input device.

Type:

(?id : string?, ?buflen : int, ?clock_safe : bool,
 ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?start : bool) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buflen (of type int, which defaults to 256): Length of a buffer in samples.
clock_safe (of type bool, which defaults to true): Force the use of a dedicated clock
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.pulseaudio`

Stream from a portaudio input device.

Type:

(?id : string?, ?client : string, ?clock_safe : bool,
 ?clock_safe : bool, ?device : string, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
client (of type string, which defaults to "liquidsoap")
clock_safe (of type bool, which defaults to true): Force the use of a dedicated clock
clock_safe (of type bool, which defaults to true): Force the use of the dedicated Pulseaudio clock.
device (of type string, which defaults to ""): Device to use. Uses default if set to ““.
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.rtmp`

Read an RTMP stream.

Type:

(?id : string?, ?max_buffer : float, ?listen : bool,
 {string}) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null)
max_buffer (of type float, which defaults to 5.): Maximum data buffer in seconds
listen (of type bool, which defaults to true): Act as a RTMP server and wait for incoming connection
(unlabeled) (of type {string}): URL to read RTMP from, in the form rtmp://IP:PORT/ENDPOINT

Methods:

buffer_length (of type () -> float): Get the buffer’s length in seconds.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source’s url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either “stopped” (the source isn’t trying to relay the HTTP stream), “polling” (attempting to connect to the HTTP stream) or “connected ” (connected to , buffering or playing back the stream).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.
url (of type () -> string): Return the source’s current url.

`input.srt`

Receive a SRT stream from a distant agent.

Type:

(?id : string?, ?bind_address : string,
 ?clock_safe : bool, ?connection_timeout : int?,
 ?content_type : string, ?dump : string, ?host : string,
 ?log_overfull : bool, ?max : float, ?messageapi : bool,
 ?mode : string, ?on_connect : ((unit) -> unit),
 ?on_disconnect : (() -> unit), ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?payload_size : int,
 ?port : int, ?read_timeout : int?, ?start : bool,
 ?stats_interval : int, ?stats_interval : int?,
 ?write_timeout : int?) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bind_address (of type string, which defaults to "0.0.0.0"): Address to bind on the local machine. Used only in listener mode
clock_safe (of type bool, which defaults to true): Force the use of a dedicated clock
connection_timeout (of type int?, which defaults to null): Timeout, in milliseconds, after which initial connection operations are aborted if no data was received, indefinite if null.
content_type (of type string, which defaults to "application/ffmpeg"): Content-Type (mime type) used to find a decoder for the input stream.
dump (of type string, which defaults to ""): Dump received data to the given file for debugging. Unused is empty.
host (of type string, which defaults to "localhost"): Address to connect to. Used only in caller mode.
log_overfull (of type bool, which defaults to true): Log when the source’s buffer is overfull.
max (of type float, which defaults to 10.): Maximum duration of the buffered data.
messageapi (of type bool, which defaults to true): Use message api
mode (of type string, which defaults to "listener"): Mode to operate on. One of: "listener" (waits for connection to come in) or "caller" (initiate connection to a remote server)
on_connect (of type (unit) -> unit, which defaults to <fun>): Function to execute when connected.
on_disconnect (of type () -> unit, which defaults to <fun>): Function to execute when disconnected
on_start (of type () -> unit, which defaults to <fun>): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when input stops.
payload_size (of type int, which defaults to 1316): Payload size.
port (of type int, which defaults to 8000): Port to bind on the local machine (listener mode) or to connect to (caller mode). The term port as used in SRT is occasionally identical to the term UDP port. However SRT offers more flexibility than UDP because it manages ports as its own resources. For example, one port may be shared between various services.
read_timeout (of type int?, which defaults to 1000): Timeout, in milliseconds, after which read operations are aborted if no data was received, indefinite if null.
start (of type bool, which defaults to true): Start input as soon as it is available.
stats_interval (of type int, which defaults to 100): Interval used to collect statistics
stats_interval (of type int?, which defaults to null): Interval used to collect internal stats in milliseconds
write_timeout (of type int?, which defaults to 1000): Timeout, in milliseconds, after which write operations are aborted if no data was received, indefinite if null.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stats (of type () -> { byteAvailRcvBuf : int, byteAvailSndBuf : int, byteMSS : int, byteRcvBuf : int, byteRcvDrop : int, byteRcvDropTotal : int, byteRcvUndecrypt : int, byteRcvUndecryptTotal : int, byteRecv : int, byteRecvTotal : int, byteRetrans : int, byteRetransTotal : int, byteSent : int, byteSentTotal : int, byteSndBuf : int, byteSndDrop : int, byteSndDropTotal : int, mbpsBandwidth : float, mbpsMaxBW : float, mbpsRecvRate : float, mbpsSendRate : float, msRTT : float, msRcvBuf : int, msRcvTsbPdDelay : int, msSndBuf : int, msSndTsbPdDelay : int, msTimeStamp : int, pktCongestionWindow : int, pktFlightSize : int, pktFlowWindow : int, pktRcvAvgBelatedTime : float, pktRcvBelated : int, pktRcvBuf : int, pktRcvDrop : int, pktRcvDropTotal : int, pktRcvFilterExtra : int, pktRcvFilterExtraTotal : int, pktRcvFilterLoss : int, pktRcvFilterLossTotal : int, pktRcvFilterSupply : int, pktRcvFilterSupplyTotal : int, pktRcvLoss : int, pktRcvLossTotal : int, pktRcvRetrans : int, pktRcvUndecrypt : int, pktRcvUndecryptTotal : int, pktRecv : int, pktRecvACK : int, pktRecvACKTotal : int, pktRecvNAK : int, pktRecvNAKTotal : int, pktRecvTotal : int, pktReorderDistance : int, pktRetrans : int, pktRetransTotal : int, pktSent : int, pktSentACK : int, pktSentACKTotal : int, pktSentNAK : int, pktSentNAKTotal : int, pktSentTotal : int, pktSndBuf : int, pktSndDrop : int, pktSndDropTotal : int, pktSndFilterExtra : int, pktSndFilterExtraTotal : int, pktSndLoss : int, pktSndLossTotal : int, usPktSndPeriod : float, usSndDuration : int, usSndDurationTotal : int}): Statistics.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`input.v4l2`

Stream from a video4linux2 input device, such as a webcam.

Type:

(?id : string?, ?max_buffer : float, ?device : string) ->
source(audio=none, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
max_buffer (of type float, which defaults to 0.5): Maximum data buffer in seconds
device (of type string, which defaults to "/dev/video0"): V4L2 device to use.

`native.request.dynamic`

Play request dynamically created by a given function.

Type:

(?id : string?, ?available : {bool}, ?prefetch : int,
 ?retry_delay : {float}, ?timeout : float,
 (() -> request?)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
available (of type {bool}, which defaults to true): Whether some new requests are available (when set to false, it stops after current playing request).
prefetch (of type int, which defaults to 1): How many requests should be queued in advance.
retry_delay (of type {float}, which defaults to 0.1): Retry after a given time (in seconds) when callback returns null.
timeout (of type float, which defaults to 20.): Timeout (in sec.) for a single download.
(unlabeled) (of type () -> request?)

Methods:

add (of type (request) -> bool)
current (of type () -> request?)
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool)
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
queue (of type () -> [request])
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set (of type (source(audio='A, video='B, midi='C)) -> unit): Set the source.
set_queue (of type ([request]) -> unit)
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`noise`

Generate audio white noise.

Type:

(?id : string?, ?duration : float?) ->
source(audio=internal('a), video=internal('b),
midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`playlist`

Read a playlist or a directory and play all files.

Type:

(?id : string?, ?check_next : ((request) -> bool)?,
 ?prefetch : int, ?loop : bool, ?mime_type : string?,
 ?mode : string, ?native : bool,
 ?on_reload : ((string) -> unit), ?prefix : string,
 ?reload : int, ?reload_mode : string, ?timeout : float,
 string) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
check_next (of type ((request) -> bool)?, which defaults to null): Function used to filter next tracks. A candidate track is only validated if the function returns true on it. The function is called before resolution, hence metadata will only be available for requests corresponding to local files. This is typically used to avoid repetitions, but be careful: if the function rejects all attempts, the playlist will enter into a consuming loop and stop playing anything.
prefetch (of type int, which defaults to 1): How many requests should be queued in advance.
loop (of type bool, which defaults to true): Loop on the playlist.
mime_type (of type string?, which defaults to null): Default MIME type for the playlist. null means automatic detection.
mode (of type string, which defaults to "randomize"): Play the files in the playlist either in the order (“normal” mode), or shuffle the playlist each time it is loaded, and play it in this order for a whole round (“randomize” mode), or pick a random file in the playlist each time (“random” mode).
native (of type bool, which defaults to false): Use native implementation.
on_reload (of type (string) -> unit, which defaults to <fun>): Callback called after playlist has reloaded.
prefix (of type string, which defaults to ""): Add a constant prefix to all requests. Useful for passing extra information using annotate, or for resolution through a particular protocol, such as replaygain.
reload (of type int, which defaults to 0): Amount of time (in seconds or rounds), when applicable, before which the playlist is reloaded; 0 means never.
reload_mode (of type string, which defaults to "seconds"): Unit of the reload parameter, either “never” (never reload the playlist), “rounds”, “seconds” or “watch” (reload the file whenever it is changed).
timeout (of type float, which defaults to 20.): Timeout (in sec.) for a single download.
(unlabeled) (of type string): Playlist URI.

Methods:

add (of type (request) -> bool): Add a request to the queue. Requests are resolved before being added. Returns true if the request was successfully added.
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
length (of type () -> int): Length of the of the playlist (the number of songs it contains).
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
queue (of type () -> [request]): Get the requests currently in the queue.
reload (of type (?empty_queue : bool, ?uri : string?) -> unit): Reload the playlist.
remaining (of type () -> [string])
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_queue (of type ([request]) -> unit): Set the queue of requests. Requests are resolved before being added to the queue. You are responsible for destroying the requests currently in the queue.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`playlist.list`

Play a list of files.

Type:

(?id : string?, ?check_next : ((request) -> bool)?,
 ?prefetch : int, ?loop : bool, ?mode : string,
 ?native : bool, ?on_loop : (() -> unit),
 ?on_done : (() -> unit), ?max_fail : int,
 ?on_fail : (() -> [string])?, ?timeout : float,
 [string]) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
check_next (of type ((request) -> bool)?, which defaults to null): Function used to filter next tracks. A candidate track is only validated if the function returns true on it. The function is called before resolution, hence metadata will only be available for requests corresponding to local files. This is typically used to avoid repetitions, but be careful: if the function rejects all attempts, the playlist will enter into a consuming loop and stop playing anything.
prefetch (of type int, which defaults to 1): How many requests should be queued in advance.
loop (of type bool, which defaults to true): Loop on the playlist.
mode (of type string, which defaults to "normal"): Play the files in the playlist either in the order (“normal” mode), or shuffle the playlist each time it is loaded, and play it in this order for a whole round (“randomize” mode), or pick a random file in the playlist each time (“random” mode).
native (of type bool, which defaults to false): Use native implementation.
on_loop (of type () -> unit, which defaults to <fun>): Function executed when the playlist is about to loop.
on_done (of type () -> unit, which defaults to <fun>): Function executed when the playlist is finished.
max_fail (of type int, which defaults to 10): When this number of requests fail to resolve, the whole playlists is considered as failed and on_fail is called.
on_fail (of type (() -> [string])?, which defaults to null): Function executed when too many requests failed and returning the contents of a fixed playlist.
timeout (of type float, which defaults to 20.): Timeout (in sec.) for a single download.
(unlabeled) (of type [string]): Playlist.

Methods:

add (of type (request) -> bool): Add a request to the queue. Requests are resolved before being added. Returns true if the request was successfully added.
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
queue (of type () -> [request]): Get the requests currently in the queue.
reload (of type (?empty_queue : bool, [string]) -> unit): Reload the playlist with given list of songs.
remaining (of type () -> [string]): Songs remaining to be played.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_queue (of type ([request]) -> unit): Set the queue of requests. Requests are resolved before being added to the queue. You are responsible for destroying the requests currently in the queue.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`request.dynamic`

Play request dynamically created by a given function.

Type:

(?id : string?, ?available : {bool}, ?prefetch : int,
 ?retry_delay : {float}, ?timeout : float,
 (() -> request?)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
available (of type {bool}, which defaults to true): Whether some new requests are available (when set to false, it stops after current playing request).
prefetch (of type int, which defaults to 1): How many requests should be queued in advance.
retry_delay (of type {float}, which defaults to 0.1): Retry after a given time (in seconds) when callback returns null.
timeout (of type float, which defaults to 20.): Timeout (in sec.) for a single download.
(unlabeled) (of type () -> request?)

Methods:

add (of type (request) -> bool): Add a request to the queue. Requests are resolved before being added. Returns true if the request was successfully added.
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
queue (of type () -> [request]): Get the requests currently in the queue.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_queue (of type ([request]) -> unit): Set the queue of requests. Requests are resolved before being added to the queue. You are responsible for destroying the requests currently in the queue.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`request.once`

Play a request once and become unavailable.

Type:

(?id : string?, ?timeout : float, request) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
timeout (of type float, which defaults to 20.): Timeout in seconds for resolving the request.
(unlabeled) (of type request): Request to play.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
request (of type request): Get the request played by this source
resolve (of type () -> bool): Resolve the request (this is useful to make sure that the source will be available in advance). This function returns true if we were able to successfully perform resolution. You should use this method instead of request.resolve to make sure that the proper content type is decoded from the request.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`saw`

Generate a saw wave.

Type:

(?id : string?, ?amplitude : {float}, ?duration : float?,
 ?{float}) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
amplitude (of type {float}, which defaults to 1.): Maximal value of the waveform.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
(unlabeled) (of type {float}, which defaults to 440.): Frequency of the saw.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`sine`

Generate a sine wave.

Type:

(?id : string?, ?amplitude : {float}, ?duration : float?,
 ?{float}) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
amplitude (of type {float}, which defaults to 1.): Maximal value of the waveform.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
(unlabeled) (of type {float}, which defaults to 440.): Frequency of the sine.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`single`

Loop on a request. It never fails if the request is static, meaning that it can be fetched once. Typically, http, ftp, say requests are static, and time is not.

Type:

(?id : string?, ?fallible : bool, ?prefetch : int,
 ?timeout : float, string) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Enforce fallibility of the request.
prefetch (of type int, which defaults to 1): How many requests should be queued in advance.
timeout (of type float, which defaults to 20.): Timeout (in sec.) for a single download.
(unlabeled) (of type string): URI where to find the file

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.fail`

A source that does not produce anything. No silence, no track at all.

Type:

(?id : string?) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.fail.init`

A source that errors during its initialization phase, used for testing and debugging.

Type:

(?id : string?) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`square`

Generate a square wave.

Type:

(?id : string?, ?amplitude : {float}, ?duration : float?,
 ?{float}) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
amplitude (of type {float}, which defaults to 1.): Maximal value of the waveform.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
(unlabeled) (of type {float}, which defaults to 440.): Frequency of the square.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.testsrc`

Generate a test video.

Type:

(?id : string?, ?height : int, ?width : int) ->
source(audio=internal('a), video=internal('b),
midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
height (of type int, which defaults to -1)
width (of type int, which defaults to -1)

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Liquidsoap

`buffer`

Create a buffer between two different clocks.

Type:

(?id : string?, ?buffer : float, ?fallible : bool,
 ?max : float, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?start : bool, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 1.): Amount of data to pre-buffer, in seconds.
fallible (of type bool, which defaults to true): Allow the child source to fail.
max (of type float, which defaults to 10.): Maximum amount of buffered data, in seconds.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`buffer.adaptative`

Create a buffer between two different clocks. The speed of the output is adapted so that no buffer underrun or overrun occurs. This wonderful behavior has a cost: the pitch of the sound might be changed a little.

Type:

(?id : string?, ?averaging : float, ?buffer : float,
 ?fallible : bool, ?limit : float, ?max : float,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?reset : bool, ?start : bool, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
averaging (of type float, which defaults to 30.): Half-life for the averaging of the buffer size, in seconds.
buffer (of type float, which defaults to 1.): Amount of data to pre-buffer, in seconds.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
limit (of type float, which defaults to 1.25): Maximum acceleration or deceleration factor.
max (of type float, which defaults to 10.): Maximum amount of buffered data, in seconds.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
reset (of type bool, which defaults to false): Reset speed estimation to 1. when the source becomes available again.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

Source / MIDI Processing

`midi.chord`

Generate a chord.

Type:

(?id : string?, ?metadata : string, source(audio='a,
 video='b, midi='c)) -> source(audio='d, video='e,
midi=midi(channels=1))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
metadata (of type string, which defaults to "chord"): Name of the metadata containing the chords.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`midi.merge_all`

Merge all MIDI tracks in one.

Type:

(?id : string?, ?track_out : int, source(audio='a,
 video='b, midi=midi('c))) -> source(audio='a, video='b,
midi=midi('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
track_out (of type int, which defaults to 0): Destination track.
(unlabeled) (of type source(audio='a, video='b, midi=midi('c)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`midi.remove`

Remove MIDI tracks.

Type:

(?id : string?, [int], source(audio='a, video='b,
 midi=midi('c))) -> source(audio='a, video='b,
midi=midi('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type [int]): Tracks to remove.
(unlabeled) (of type source(audio='a, video='b, midi=midi('c)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Output

`ffmpeg.filter.audio_video.output`

Return a source with audio and video from a filter’s output.

Type:

(?id : string?, ?fps : int?, ffmpeg.filter.graph,
 ffmpeg.filter.audio, ffmpeg.filter.video) ->
source(audio=ffmpeg.audio.raw('a),
video=ffmpeg.video.raw('b), midi=none)

Arguments:

id (of type string?, which defaults to null)
fps (of type int?, which defaults to null)
(unlabeled) (of type ffmpeg.filter.graph): Force the value of the source ID.
(unlabeled) (of type ffmpeg.filter.audio): Output frame per seconds. Defaults to global value.
(unlabeled) (of type ffmpeg.filter.video)

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.alsa`

Output the source’s stream to an ALSA output device.

Type:

(?id : string?, ?bufferize : bool, ?clock_safe : bool,
 ?device : string, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio=pcm('a), video='b, midi='c)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bufferize (of type bool, which defaults to true): Bufferize output
clock_safe (of type bool, which defaults to true): Force the use of the dedicated ALSA clock
device (of type string, which defaults to "default"): Alsa device to use
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.ao`

Output stream to local sound card using libao.

Type:

(?id : string?, ?buffer_size : int,
 ?channels_matrix : string, ?clock_safe : bool,
 ?driver : string, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?options : [string * string], ?start : bool,
 source(audio=pcm('a), video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer_size (of type int, which defaults to 2): Set buffer size, in frames.
channels_matrix (of type string, which defaults to ""): Output channels matrix, “” for AO’s default.
clock_safe (of type bool, which defaults to true): Use the dedicated AO clock.
driver (of type string, which defaults to ""): Driver to be used, “” for AO’s default.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
options (of type [string * string], which defaults to []): List of parameters, depends on the driver.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.dummy`

Dummy output for debugging purposes.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio='a, video='b, midi='c)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.external`

Send the stream to a process’ standard input.

Type:

(?id : string?, ?fallible : bool, ?flush : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?reopen_delay : float, ?reopen_on_error : bool,
 ?reopen_on_metadata : bool, ?reopen_when : (() -> bool),
 ?self_sync : bool, ?start : bool, format('a), {string},
 source('a)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
flush (of type bool, which defaults to false): Perform a flush after each write.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
reopen_delay (of type float, which defaults to 120.): Prevent re-opening within that delay, in seconds.
reopen_on_error (of type bool, which defaults to false): Re-open if some error occurs.
reopen_on_metadata (of type bool, which defaults to false): Re-open on every new metadata information.
reopen_when (of type () -> bool, which defaults to {false}): When should the output be re-opened.
self_sync (of type bool, which defaults to false): Set to true if the process is expected to control the output’s latency. Typical example: ffmpeg with the -re command-line option.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type format('a))
(unlabeled) (of type {string}): Process to pipe data to. Some strftime conversion specifiers are available: %SMHdmY. You can also use $(..) interpolation notation for metadata.
(unlabeled) (of type source('a)): Encoding format.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
reopen (of type () -> unit): Reopen the pipe.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.file`

Output the source stream to a file.

Type:

(?id : string?, ?append : bool, ?dir_perm : int,
 ?fallible : bool, ?flush : bool,
 ?on_close : ((string) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?perm : int, ?reopen_delay : float,
 ?reopen_on_error : bool, ?reopen_on_metadata : bool,
 ?reopen_when : (() -> bool), ?start : bool, format('a),
 {string}, source('a)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
append (of type bool, which defaults to false): Do not truncate but append in the file if it exists.
dir_perm (of type int, which defaults to 511): Permission of the directories if some have to be created, up to umask. Although you can enter values in octal notation (0oXXX) they will be displayed in decimal (for instance, 0o777 = 78^2 + 78 + 7 = 511).
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
flush (of type bool, which defaults to false): Perform a flush after each write.
on_close (of type (string) -> unit, which defaults to <fun>): This function will be called for each file, after that it is finished and closed. The filename will be passed as argument.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
perm (of type int, which defaults to 438): Permission of the file if it has to be created, up to umask. You can and should write this number in octal notation: 0oXXX. The default value is however displayed in decimal (0o666 = 68^2 + 68 + 6 = 438).
reopen_delay (of type float, which defaults to 120.): Prevent re-opening within that delay, in seconds.
reopen_on_error (of type bool, which defaults to false): Re-open if some error occurs.
reopen_on_metadata (of type bool, which defaults to false): Re-open on every new metadata information.
reopen_when (of type () -> bool, which defaults to {false}): When should the output be re-opened.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type format('a)): Encoding format.
(unlabeled) (of type {string}): Filename where to output the stream. Some strftime conversion specifiers are available: %SMHdmY. You can also use $(..) interpolation notation for metadata.
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.file.hls`

Output the source stream to an HTTP live stream served from a local directory.

Type:

(?id : string?, ?fallible : bool,
 ?on_file_change : ((state : string, string) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?perm : int, ?persist_at : string?, ?playlist : string,
 ?prefix : string, ?segment_duration : float,
 ?segment_name : ((position : int, extname : string,
                   string) -> string),
 ?segments : int, ?segments_overhead : int,
 ?start : bool,
 ?streams_info : [string * 
                  {
                    bandwidth : int,
                    codecs : string,
                    extname : string,
                    video_size : (int * int)?
                  }],
 ?strict_persist : bool, string, [string * format('a)],
 source('a)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_file_change (of type (state : string, string) -> unit, which defaults to <fun>): Callback executed when a file changes. state is one of: "opened", "closed" or "deleted", second argument is file path. Typical use: upload files to a CDN when done writing ("close" state and remove when "deleted".
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
perm (of type int, which defaults to 420): Permission of the created files, up to umask. You can and should write this number in octal notation: 0oXXX. The default value is however displayed in decimal (0o666 = 68^2 + 48 + 4 = 412).
persist_at (of type string?, which defaults to null): Location of the configuration file used to restart the output. Relative paths are assumed to be with regard to the directory for generated file.
playlist (of type string, which defaults to "stream.m3u8"): Playlist name (m3u8 extension is recommended).
prefix (of type string, which defaults to ""): Prefix for each files in playlists.
segment_duration (of type float, which defaults to 10.): Segment duration (in seconds).
segment_name (of type (position : int, extname : string, string) -> string, which defaults to <fun>): Segment name. Default: fun (~position,~extname,stream_name) -> "#{stream_name}_#{position}.#{extname}"
segments (of type int, which defaults to 10): Number of segments per playlist.
segments_overhead (of type int, which defaults to 5): Number of segments to keep after they have been featured in the live playlist.
start (of type bool, which defaults to true): Start output as soon as it is available.
streams_info (of type [string * { bandwidth : int, codecs : string, extname : string, video_size : (int * int)? }], which defaults to []): Additional information about the streams. Should be a list of the form: [(stream_name, (bandwidth, codecs, extname, (width, height)?)]. See RFC 6381 for info about codecs. Stream info are required when they cannot be inferred from the encoder.
strict_persist (of type bool, which defaults to false): Fail if an invalid saved state exists.
(unlabeled) (of type string): Directory for generated files.
(unlabeled) (of type [string * format('a)]): List of specifications for each stream: (name, format).
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.harbor`

Encode and output the stream using the harbor server.

Type:

(?id : string?,
 ?auth : ((address : string, string, string) -> bool)?,
 ?buffer : int, ?burst : int, ?chunk : int,
 ?dumpfile : string?, ?encoding : string,
 ?fallible : bool, ?format : string,
 ?headers : [string * string], ?metaint : int,
 mount : string,
 ?on_connect : ((headers : [string * string],
                 uri : string, protocol : string, string) ->
                unit),
 ?on_disconnect : ((string) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?password : string?, ?port : int, ?start : bool,
 ?timeout : float, ?url : string?, ?user : string?,
 format(audio='a, video='b, midi='c), source(audio='a,
 video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
auth (of type ((address : string, string, string) -> bool)?, which defaults to null): Authentication function. f(~address,login,password) returns true if the user should be granted access for this login. When defined, user and password arguments are not taken in account.
buffer (of type int, which defaults to 327675): Maximum buffer per-client.
burst (of type int, which defaults to 65534): Initial burst of data sent to the client.
chunk (of type int, which defaults to 4096): Send data to clients using chunks of at least this length.
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
encoding (of type string, which defaults to ""): Encoding used to send metadata. If empty, defaults to “ISO-8859-1” for non-ogg formats and “UTF-8” otherwise.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
format (of type string, which defaults to ""): Format, e.g. “audio/ogg”. When empty, the encoder is used to guess.
headers (of type [string * string], which defaults to []): Additional headers.
metaint (of type int, which defaults to 8192): Interval used to send ICY metadata
mount (of type string)
on_connect (of type (headers : [string * string], uri : string, protocol : string, string) -> unit, which defaults to <fun>): Callback executed when connection is established (takes headers, connection uri, protocol and client’s IP as arguments).
on_disconnect (of type (string) -> unit, which defaults to <fun>): Callback executed when connection stops (takes client’s IP as argument).
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
password (of type string?, which defaults to null): Password for client connection. A user must also be set. We check for this password is checked unless an auth function is defined, which is used in this case.
port (of type int, which defaults to 8000)
start (of type bool, which defaults to true): Start output as soon as it is available.
timeout (of type float, which defaults to 30.): Timeout for network operations (in seconds).
url (of type string?, which defaults to null)
user (of type string?, which defaults to null): User for client connection. You also need to setup a password.
(unlabeled) (of type format(audio='a, video='b, midi='c)): Encoding format.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.harbor.hls`

Output the source stream to an HTTP live stream served from the harbor HTTP server.

Type:

(?id : string?, ?fallible : bool,
 ?on_file_change : ((state : string, string) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?perm : int, ?persist_at : string?, ?playlist : string,
 ?prefix : string, ?segment_duration : float,
 ?segments : int, ?segments_overhead : int,
 ?start : bool,
 ?streams_info : [string * 
                  {
                    bandwidth : int,
                    codecs : string,
                    extname : string,
                    video_size : (int * int)?
                  }],
 ?strict_persist : bool,
 ?segment_name : ((position : int, extname : string,
                   string) -> string),
 ?headers : [string * string], ?port : int,
 ?path : string, ?tmpdir : string?,
 [string * format('a)], source('a)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_file_change (of type (state : string, string) -> unit, which defaults to <fun>): Callback executed when a file changes. state is one of: "opened", "closed" or "deleted", second argument is file path. Typical use: upload files to a CDN when done writing ("close" state and remove when "deleted".
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
perm (of type int, which defaults to 420): Permission of the created files, up to umask. You can and should write this number in octal notation: 0oXXX. The default value is however displayed in decimal (0o666 = 68^2 + 48 + 4 = 412).
persist_at (of type string?, which defaults to null): Location of the configuration file used to restart the output. Relative paths are assumed to be with regard to the directory for generated file.
playlist (of type string, which defaults to "stream.m3u8"): Playlist name (m3u8 extension is recommended).
prefix (of type string, which defaults to ""): Prefix for each files in playlists.
segment_duration (of type float, which defaults to 10.): Segment duration (in seconds).
segments (of type int, which defaults to 10): Number of segments per playlist.
segments_overhead (of type int, which defaults to 5): Number of segments to keep after they have been featured in the live playlist.
start (of type bool, which defaults to true): Start output as soon as it is available.
streams_info (of type [string * { bandwidth : int, codecs : string, extname : string, video_size : (int * int)? }], which defaults to []): Additional information about the streams. Should be a list of the form: [(stream_name, (bandwidth, codecs, extname, (width, height)?)]. See RFC 6381 for info about codecs. Stream info are required when they cannot be inferred from the encoder.
strict_persist (of type bool, which defaults to false): Fail if an invalid saved state exists.
segment_name (of type (position : int, extname : string, string) -> string, which defaults to <fun>): Segment name. Default: fun (~position,~extname,stream_name) -> "#{stream_name}_#{position}.#{extname}"
headers (of type [string * string], which defaults to [("Access-Control-Allow-Origin", "*")]): Default response headers.
port (of type int, which defaults to 8000): Port for incoming harbor (http) connections.
path (of type string, which defaults to "/"): Base path for hls URIs.
tmpdir (of type string?, which defaults to null): Directory for generated files.
(unlabeled) (of type [string * format('a)]): List of specifications for each stream: (name, format).
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.harbor.ssl`

Encode and output the stream using the SSL harbor server.

Type:

(?id : string?,
 ?auth : ((address : string, string, string) -> bool)?,
 ?buffer : int, ?burst : int, ?chunk : int,
 ?dumpfile : string?, ?encoding : string,
 ?fallible : bool, ?format : string,
 ?headers : [string * string], ?metaint : int,
 mount : string,
 ?on_connect : ((headers : [string * string],
                 uri : string, protocol : string, string) ->
                unit),
 ?on_disconnect : ((string) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?password : string?, ?port : int, ?start : bool,
 ?timeout : float, ?url : string?, ?user : string?,
 format(audio='a, video='b, midi='c), source(audio='a,
 video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
auth (of type ((address : string, string, string) -> bool)?, which defaults to null): Authentication function. f(~address,login,password) returns true if the user should be granted access for this login. When defined, user and password arguments are not taken in account.
buffer (of type int, which defaults to 327675): Maximum buffer per-client.
burst (of type int, which defaults to 65534): Initial burst of data sent to the client.
chunk (of type int, which defaults to 4096): Send data to clients using chunks of at least this length.
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
encoding (of type string, which defaults to ""): Encoding used to send metadata. If empty, defaults to “ISO-8859-1” for non-ogg formats and “UTF-8” otherwise.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
format (of type string, which defaults to ""): Format, e.g. “audio/ogg”. When empty, the encoder is used to guess.
headers (of type [string * string], which defaults to []): Additional headers.
metaint (of type int, which defaults to 8192): Interval used to send ICY metadata
mount (of type string)
on_connect (of type (headers : [string * string], uri : string, protocol : string, string) -> unit, which defaults to <fun>): Callback executed when connection is established (takes headers, connection uri, protocol and client’s IP as arguments).
on_disconnect (of type (string) -> unit, which defaults to <fun>): Callback executed when connection stops (takes client’s IP as argument).
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
password (of type string?, which defaults to null): Password for client connection. A user must also be set. We check for this password is checked unless an auth function is defined, which is used in this case.
port (of type int, which defaults to 8000)
start (of type bool, which defaults to true): Start output as soon as it is available.
timeout (of type float, which defaults to 30.): Timeout for network operations (in seconds).
url (of type string?, which defaults to null)
user (of type string?, which defaults to null): User for client connection. You also need to setup a password.
(unlabeled) (of type format(audio='a, video='b, midi='c)): Encoding format.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.icecast`

Encode and output the stream to an icecast2 or shoutcast server.

Type:

(?id : string?, ?chunked : bool,
 ?connection_timeout : float, ?description : string?,
 ?dumpfile : string?, ?encoding : string?,
 ?fallible : bool, ?format : string, ?genre : string?,
 ?headers : [string * string], ?host : string,
 ?icy_id : int, ?icy_metadata : string, ?method : string,
 ?mount : string, ?name : string,
 ?on_connect : (() -> unit),
 ?on_disconnect : (() -> unit),
 ?on_error : ((string) -> float),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?password : string, ?port : int, ?protocol : string,
 ?public : bool, ?start : bool, ?timeout : float,
 ?url : string?, ?user : string?, format('a), source('a)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
chunked (of type bool, which defaults to false): Used chunked transfer with the ‘http(s)’ protocol.
connection_timeout (of type float, which defaults to 5.): Timeout for establishing network connections (disabled is negative).
description (of type string?, which defaults to null)
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
encoding (of type string?, which defaults to null): Encoding used to send metadata and stream info (name, genre and description). If null, defaults to “UTF-8” for “http(s)” protocol and “ISO-8859-1” for “icy” protocol.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
format (of type string, which defaults to ""): Format, e.g. “audio/ogg”. When empty, the encoder is used to guess.
genre (of type string?, which defaults to null)
headers (of type [string * string], which defaults to [("User-Agent", "Liquidsoap/2.1.0 (Unix; OCaml 4.14.0)")]): Additional headers.
host (of type string, which defaults to "localhost")
icy_id (of type int, which defaults to 1): Shoutcast source ID. Only supported by Shoutcast v2.
icy_metadata (of type string, which defaults to "guess"): Send new metadata using the ICY protocol. One of: “guess”, “true”, “false”
method (of type string, which defaults to "source"): method to use with the ‘http(s)’ protocol. One of: ‘source’, ‘put’ or ‘post’.
mount (of type string, which defaults to "Use [name]"): Source mount point. Mandatory when streaming to icecast.
name (of type string, which defaults to "Use [mount]")
on_connect (of type () -> unit, which defaults to <fun>): Callback executed when connection is established.
on_disconnect (of type () -> unit, which defaults to <fun>): Callback executed when connection stops.
on_error (of type (string) -> float, which defaults to fun (_) -> 3.): Callback executed when an error happens. The callback receives a string representation of the error that occurred and returns a float. If returned value is positive, connection will be tried again after this amount of time (in seconds).
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
password (of type string, which defaults to "hackme")
port (of type int, which defaults to 8000)
protocol (of type string, which defaults to "http"): Protocol of the streaming server: ‘http’ or ‘https’ for Icecast, ‘icy’ for shoutcast.
public (of type bool, which defaults to true)
start (of type bool, which defaults to true): Start output as soon as it is available.
timeout (of type float, which defaults to 30.): Timeout for network read and write.
url (of type string?, which defaults to null)
user (of type string?, which defaults to null): User for shout source connection. Defaults to “source” for icecast connections. Useful only in special cases, like with per-mountpoint users.
(unlabeled) (of type format('a)): Encoding format.
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.jack`

Output stream to jack.

Type:

(?id : string?, ?buffer_size : int, ?clock_safe : bool,
 ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?server : string,
 ?start : bool, source(audio=pcm('a), video='b, midi='c)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer_size (of type int, which defaults to 2): Set buffer size, in frames.
clock_safe (of type bool, which defaults to true): Force the use of the dedicated bjack clock.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
server (of type string, which defaults to ""): Jack server to connect to.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.oss`

Output the source’s stream to an OSS output device.

Type:

(?id : string?, ?clock_safe : bool, ?device : string,
 ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?start : bool,
 source(audio=pcm('a), video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
clock_safe (of type bool, which defaults to true): Force the use of the dedicated OSS clock.
device (of type string, which defaults to "/dev/dsp"): OSS device to use.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.portaudio`

Output the source’s stream to a portaudio output device.

Type:

(?id : string?, ?buflen : int, ?clock_safe : bool,
 ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?start : bool,
 source(audio=pcm('a), video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buflen (of type int, which defaults to 256): Length of a buffer in samples.
clock_safe (of type bool, which defaults to true): Force the use of the dedicated Portaudio clock.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.pulseaudio`

Output the source’s stream to a portaudio output device.

Type:

(?id : string?, ?client : string, ?clock_safe : bool,
 ?device : string, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio=pcm('a), video='b, midi='c)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
client (of type string, which defaults to "liquidsoap")
clock_safe (of type bool, which defaults to true): Force the use of the dedicated Pulseaudio clock.
device (of type string, which defaults to ""): Device to use. Uses default if set to ““.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.sdl`

Display a video using SDL.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?start : bool, source(audio='a, video=canvas('b),
 midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
start (of type bool, which defaults to true): Start output as soon as it is available.
(unlabeled) (of type source(audio='a, video=canvas('b), midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.sdl.has_video`

Check whether video output is available with SDL.

Type:

() -> bool

Arguments:

`output.shoutcast`

Output to shoutcast.

Type:

(?id : string?, ?chunked : bool,
 ?connection_timeout : float, ?dumpfile : string?,
 ?encoding : string?, ?fallible : bool, ?format : string,
 ?genre : string?, ?host : string, ?icy_id : int,
 ?icy_metadata : string, ?method : string,
 ?mount : string, ?name : string,
 ?on_connect : (() -> unit),
 ?on_disconnect : (() -> unit),
 ?on_error : ((string) -> float),
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?password : string, ?port : int, ?public : bool,
 ?start : bool, ?timeout : float, ?url : string?,
 ?user : string?, ?icy_reset : bool, ?icy_id : int,
 ?dj : (() -> string), ?aim : string, ?icq : string,
 ?irc : string, format(audio='a, video='b, midi='c),
 source(audio='a, video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
chunked (of type bool, which defaults to false): Used chunked transfer with the ‘http(s)’ protocol.
connection_timeout (of type float, which defaults to 5.): Timeout for establishing network connections (disabled is negative).
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
encoding (of type string?, which defaults to null): Encoding used to send metadata and stream info (name, genre and description). If null, defaults to “UTF-8” for “http(s)” protocol and “ISO-8859-1” for “icy” protocol.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
format (of type string, which defaults to ""): Format, e.g. “audio/ogg”. When empty, the encoder is used to guess.
genre (of type string?, which defaults to null)
host (of type string, which defaults to "localhost")
icy_id (of type int, which defaults to 1): Shoutcast source ID. Only supported by Shoutcast v2.
icy_metadata (of type string, which defaults to "guess"): Send new metadata using the ICY protocol. One of: “guess”, “true”, “false”
method (of type string, which defaults to "source"): method to use with the ‘http(s)’ protocol. One of: ‘source’, ‘put’ or ‘post’.
mount (of type string, which defaults to "Use [name]"): Source mount point. Mandatory when streaming to icecast.
name (of type string, which defaults to "Use [mount]")
on_connect (of type () -> unit, which defaults to <fun>): Callback executed when connection is established.
on_disconnect (of type () -> unit, which defaults to <fun>): Callback executed when connection stops.
on_error (of type (string) -> float, which defaults to fun (_) -> 3.): Callback executed when an error happens. The callback receives a string representation of the error that occurred and returns a float. If returned value is positive, connection will be tried again after this amount of time (in seconds).
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
password (of type string, which defaults to "hackme")
port (of type int, which defaults to 8000)
public (of type bool, which defaults to true)
start (of type bool, which defaults to true): Start output as soon as it is available.
timeout (of type float, which defaults to 30.): Timeout for network read and write.
url (of type string?, which defaults to null)
user (of type string?, which defaults to null): User for shout source connection. Defaults to “source” for icecast connections. Useful only in special cases, like with per-mountpoint users.
icy_reset (of type bool, which defaults to true): Reset shoutcast source buffer upon connecting (necessary for NSV).
icy_id (of type int, which defaults to 1): Shoutcast source ID. Only supported by Shoutcast v2.
dj (of type () -> string, which defaults to {""}): Callback to set dj name.
aim (of type string, which defaults to "")
icq (of type string, which defaults to "")
irc (of type string, which defaults to "")
(unlabeled) (of type format(audio='a, video='b, midi='c)): Encoding format. For shoutcast, should be mp3 or AAC(+).
(unlabeled) (of type source(audio='a, video='b, midi='c)): The source to output

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.srt`

Send a SRT stream to a distant agent.

Type:

(?id : string?, ?bind_address : string,
 ?connection_timeout : int?, ?fallible : bool,
 ?host : string, ?messageapi : bool, ?mode : string,
 ?on_connect : ((unit) -> unit),
 ?on_disconnect : (() -> unit), ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?payload_size : int,
 ?port : int, ?read_timeout : int?, ?start : bool,
 ?stats_interval : int, ?write_timeout : int?,
 format(audio='a, video='b, midi='c), source(audio='a,
 video='b, midi='c)) -> unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bind_address (of type string, which defaults to "0.0.0.0"): Address to bind on the local machine. Used only in listener mode
connection_timeout (of type int?, which defaults to 3000): Timeout, in milliseconds, after which initial connection operations are aborted if no data was received, indefinite if null.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
host (of type string, which defaults to "localhost"): Address to connect to. Used only in caller mode.
messageapi (of type bool, which defaults to true): Use message api
mode (of type string, which defaults to "caller"): Mode to operate on. One of: "listener" (waits for connection to come in) or "caller" (initiate connection to a remote server)
on_connect (of type (unit) -> unit, which defaults to <fun>): Function to execute when connected.
on_disconnect (of type () -> unit, which defaults to <fun>): Function to execute when disconnected
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
payload_size (of type int, which defaults to 1316): Payload size.
port (of type int, which defaults to 8000): Port to bind on the local machine (listener mode) or to connect to (caller mode). The term port as used in SRT is occasionally identical to the term UDP port. However SRT offers more flexibility than UDP because it manages ports as its own resources. For example, one port may be shared between various services.
read_timeout (of type int?, which defaults to 1000): Timeout, in milliseconds, after which read operations are aborted if no data was received, indefinite if null.
start (of type bool, which defaults to true): Start output as soon as it is available.
stats_interval (of type int, which defaults to 100): Interval used to collect statistics
write_timeout (of type int?, which defaults to 1000): Timeout, in milliseconds, after which write operations are aborted if no data was received, indefinite if null.
(unlabeled) (of type format(audio='a, video='b, midi='c)): Encoding format.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stats (of type () -> { byteAvailRcvBuf : int, byteAvailSndBuf : int, byteMSS : int, byteRcvBuf : int, byteRcvDrop : int, byteRcvDropTotal : int, byteRcvUndecrypt : int, byteRcvUndecryptTotal : int, byteRecv : int, byteRecvTotal : int, byteRetrans : int, byteRetransTotal : int, byteSent : int, byteSentTotal : int, byteSndBuf : int, byteSndDrop : int, byteSndDropTotal : int, mbpsBandwidth : float, mbpsMaxBW : float, mbpsRecvRate : float, mbpsSendRate : float, msRTT : float, msRcvBuf : int, msRcvTsbPdDelay : int, msSndBuf : int, msSndTsbPdDelay : int, msTimeStamp : int, pktCongestionWindow : int, pktFlightSize : int, pktFlowWindow : int, pktRcvAvgBelatedTime : float, pktRcvBelated : int, pktRcvBuf : int, pktRcvDrop : int, pktRcvDropTotal : int, pktRcvFilterExtra : int, pktRcvFilterExtraTotal : int, pktRcvFilterLoss : int, pktRcvFilterLossTotal : int, pktRcvFilterSupply : int, pktRcvFilterSupplyTotal : int, pktRcvLoss : int, pktRcvLossTotal : int, pktRcvRetrans : int, pktRcvUndecrypt : int, pktRcvUndecryptTotal : int, pktRecv : int, pktRecvACK : int, pktRecvACKTotal : int, pktRecvNAK : int, pktRecvNAKTotal : int, pktRecvTotal : int, pktReorderDistance : int, pktRetrans : int, pktRetransTotal : int, pktSent : int, pktSentACK : int, pktSentACKTotal : int, pktSentNAK : int, pktSentNAKTotal : int, pktSentTotal : int, pktSndBuf : int, pktSndDrop : int, pktSndDropTotal : int, pktSndFilterExtra : int, pktSndFilterExtraTotal : int, pktSndLoss : int, pktSndLossTotal : int, usPktSndPeriod : float, usSndDuration : int, usSndDurationTotal : int}): Statistics.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`output.url`

Encode and let encoder handle data output. Useful with encoder with no expected output or to encode to files that need full control from the encoder, e.g. %ffmpeg with rtmp output.

Type:

(?id : string?, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?restart_on_error : bool, ?self_sync : bool,
 ?start : bool, url : string, format('a), source('a)) ->
unit

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be stopped until the source is available again.
on_start (of type () -> unit, which defaults to <fun>): Callback executed when output starts.
on_stop (of type () -> unit, which defaults to <fun>): Callback executed when output stops.
restart_on_error (of type bool, which defaults to true): Restart output on errors
self_sync (of type bool, which defaults to false): Should the source control its own synchronization? Set to true for output to e.g. rtmp output using %ffmpeg and etc.
start (of type bool, which defaults to true): Start output as soon as it is available.
url (of type string): Url to output to.
(unlabeled) (of type format('a)): Encoding format.
(unlabeled) (of type source('a))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Sound Processing

`bass_boost`

Add some bass to the sound.

Type:

(?frequency : {float}, ?gain : {float},
 source(audio=pcm('a), video=internal('b),
 midi=internal('c))) -> source(audio=pcm('a),
video=internal('b), midi=internal('c))

Arguments:

frequency (of type {float}, which defaults to 200.): Frequency below which sound is considered as bass.
gain (of type {float}, which defaults to 10.): Amount of boosting (dB).
(unlabeled) (of type source(audio=pcm('a), video=internal('b), midi=internal('c))): Source whose bass should be boosted

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`compress.multiband`

Multiband compression. The list in argument specifies - the frequency below which we should apply compression (it is above previous band) - the attack time (ms) - the release time (ms) - the compression ratio - the threshold for compression - the gain for the band

Type:

(?limit : bool, ?wet : {float}, source(audio=pcm('a),
 video=internal('b), midi=internal('c)),
 ['d
  .{
    attack : {float},
    frequency : {float},
    gain : {float},
    ratio : {float},
    release : {float},
    threshold : {float}
  }]) -> source(audio=pcm('a), video=internal('b),
midi=internal('c))

Arguments:

limit (of type bool, which defaults to true): Also apply limiting to bands.
wet (of type {float}, which defaults to 1.)
(unlabeled) (of type source(audio=pcm('a), video=internal('b), midi=internal('c))): Parameters for compression bands.
(unlabeled) (of type ['d .{ attack : {float}, frequency : {float}, gain : {float}, ratio : {float}, release : {float}, threshold : {float} }]): Source on which multiband compression should be applied.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gain (of type () -> float): Gain (dB).
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): RMS or peak power (linear).
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`dry_wet`

Mix between dry and wet sources. Useful for testing effects. Typically:

c = interactive.float("wetness", min=0., max=1., 1.)
s = dry_wet(c, s, effect(s))

and vary c to hear the difference between the source without and with the effect.

Type:

(?power : bool, {float}, source(audio=internal('a),
 video=internal('b), midi=internal('c)),
 source(audio=internal('a), video=internal('b),
 midi=internal('c))) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

power (of type bool, which defaults to false): If true use constant power mixing.
(unlabeled) (of type {float}): Wetness coefficient, from 0 (fully dry) to 1 (fully wet).
(unlabeled) (of type source(audio=internal('a), video=internal('b), midi=internal('c))): Dry source.
(unlabeled) (of type source(audio=internal('a), video=internal('b), midi=internal('c))): Wet source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`fade.in`

Fade the beginning of tracks.

Type:

(?id : string, ?duration : float,
 ?override_duration : string, ?override_type : string,
 ?track_sensitive : bool, ?type : string,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string, which defaults to "fade.in"): Force the value of the source ID.
duration (of type float, which defaults to 3.): Duration of the fading. This value can be set on a per-file basis using the metadata field passed as override.
override_duration (of type string, which defaults to "liq_fade_in"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
override_type (of type string, which defaults to "liq_fade_type"): Metadata field which, if present and correct, overrides the ‘type’ parameter for current track.
track_sensitive (of type bool, which defaults to true): Be track sensitive (if false we only fade in once at the beginning of the track).
type (of type string, which defaults to "lin"): Fader shape (lin|sin|log|exp): linear, sinusoidal, logarithmic or exponential.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`fade.out`

Fade the end of tracks.

Type:

(?id : string, ?duration : float,
 ?override_duration : string, ?override_type : string,
 ?track_sensitive : bool, ?type : string,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string, which defaults to "fade.out"): Force the value of the source ID.
duration (of type float, which defaults to 3.): Duration of the fading. This value can be set on a per-file basis using the metadata field passed as override.
override_duration (of type string, which defaults to "liq_fade_out"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
override_type (of type string, which defaults to "liq_fade_type"): Metadata field which, if present and correct, overrides the ‘type’ parameter for current track.
track_sensitive (of type bool, which defaults to true): Be track sensitive (if false we only fade ou once at the beginning of the track).
type (of type string, which defaults to "lin"): Fader shape (lin|sin|log|exp): linear, sinusoidal, logarithmic or exponential.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`fade.skip`

Fade when the metadata trigger is received and then skip.

Type:

(?id : string, ?duration : float,
 ?override_duration : string, ?override_type : string,
 ?override_skip : string, ?type : string,
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string, which defaults to "fade.skip"): Force the value of the source ID.
duration (of type float, which defaults to 5.): Duration of the fading. This value can be set on a per-file basis using the metadata field passed as override.
override_duration (of type string, which defaults to "liq_fade_skip"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
override_type (of type string, which defaults to "liq_fade_skip"): Metadata field which, if present and correct, overrides the ‘type’ parameter for current track.
override_skip (of type string, which defaults to "liq_skip_meta"): Metadata field which, when present and set to “true”, will trigger the fade
type (of type string, which defaults to "lin"): Fader shape (lin|sin|log|exp): linear, sinusoidal, logarithmic or exponential.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`filter.iir.eq.low_high`

A bandpass filter obtained by chaining a low-pass and a high-pass filter.

Type:

(?id : string?, low : {float}, high : {float},
 ?q : float, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null)
low (of type {float}): Lower frequency of the bandpass filter.
high (of type {float}): Higher frequency of the bandpass filter.
q (of type float, which defaults to 1.): Q factor.
(unlabeled) (of type source(audio='a, video='b, midi='c)): Force the value of the source ID.

`limit`

A limiter. This is a compress with tweaked parameters.

Type:

(?attack : {float}, ?release : {float}, ?ratio : {float},
 ?threshold : {float}, ?pre_gain : {float},
 ?gain : {float}, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

attack (of type {float}, which defaults to 50.)
release (of type {float}, which defaults to 200.)
ratio (of type {float}, which defaults to 20.)
threshold (of type {float}, which defaults to -2.)
pre_gain (of type {float}, which defaults to 0.)
gain (of type {float}, which defaults to 0.)
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gain (of type () -> float): Gain (dB).
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): RMS or peak power (linear).
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`mic_filter`

Remove low frequencies often produced by microphones.

Type:

(?frequency : float, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

frequency (of type float, which defaults to 200.): Frequency under which sound should be lowered.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): The input source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`normalize`

Normalization the volume of a stream (this is also called automatic gain control). Dynamic normalization of the signal is sometimes the only option (for instance, for live sources), and can make a listening experience much nicer. However, its dynamic aspect implies some limitations which can go as far as creating saturation in some extreme cases. If possible, consider using some track-based normalization techniques such as those based on ReplayGain. The implementation of Liquidsoap < 2.0 was renamed to normalize.old.

Type:

(?id : string?, ?target : {float}, ?up : {float},
 ?down : {float}, ?gain_min : float, ?gain_max : float,
 ?lufs : bool, ?lookahead : {float}, ?window : {float},
 ?threshold : {float}, ?track_sensitive : bool,
 ?debug : float??, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
target (of type {float}, which defaults to -13.): Desired RMS (dB).
up (of type {float}, which defaults to 10.): Characteristic time to go up.
down (of type {float}, which defaults to 0.1): Characteristic time to go down.
gain_min (of type float, which defaults to -12.): Minimal gain value (dB).
gain_max (of type float, which defaults to 12.): Maximal gain value (dB).
lufs (of type bool, which defaults to false): Use LUFS instead of RMS to compute intensity.
lookahead (of type {float}, which defaults to 0.): How much time to look ahead of the signal (second). Setting a positive value delays the output by the corresponding amount of time.
window (of type {float}, which defaults to 0.5): Duration of the window used to compute the current RMS power (second).
threshold (of type {float}, which defaults to -40.): Minimal RMS for activaing gain control (dB).
track_sensitive (of type bool, which defaults to true)
debug (of type float??, which defaults to null): How often to print debug messages, in seconds, useful to finetune the parameters. You should set set("log.level", 5) to see them.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): Source to normalize.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
gain (of type () -> float): Current amplification coefficient (in linear scale).
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): Current rms (in linear scale).
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
target_gain (of type () -> float): Current target amplification coefficient (in linear scale).
time (of type () -> float): Get a source’s time, based on its assigned clock.

`replaygain`

Amplify source tracks according to replaygain metadata. This operator does not compute itself the replaygain: you can use either enable_replaygain_metadata or the replaygain: protocol for this.

Type:

(?ebu_r128 : bool, source(audio=pcm('a), video='b,
 midi='c)) -> source(audio=pcm('a), video='b, midi='c)

Arguments:

ebu_r128 (of type bool, which defaults to true): Also amplify according to EBU R128 tags.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c)): Source to be amplified.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Sound Synthesis

`dssi.register`

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string): Path of the DSSI plugin file.

`dtmf`

Generate DTMF tones.

Type:

(?duration : float, ?delay : float, string) ->
source(audio=internal('a), video=internal('b),
midi=internal('c))

Arguments:

duration (of type float, which defaults to 0.1): Duration of a tone (in seconds).
delay (of type float, which defaults to 0.05): Dealy between two successive tones (in seconds).
(unlabeled) (of type string): String describing DTMF tones to generates: it should contains characters 0 to 9, A to D, or * or #.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`synth.all.saw`

Saw synthesizer. It creates one synthesizer for each channel.

Type:

(?id : string?, ?attack : float, ?decay : float,
 ?envelope : bool, ?release : float, ?sustain : float,
 source(audio=pcm(mono), video='a,
 midi=midi(channels=16))) -> source(audio=pcm(mono),
video='a, midi=midi(channels=16))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type float, which defaults to 0.02): Envelope attack (in seconds).
decay (of type float, which defaults to 0.01): Envelope decay (in seconds).
envelope (of type bool, which defaults to true): Use envelope.
release (of type float, which defaults to 0.01): Envelope release (in seconds).
sustain (of type float, which defaults to 0.9): Envelope sustain level.
(unlabeled) (of type source(audio=pcm(mono), video='a, midi=midi(channels=16)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`synth.all.sine`

Sine synthesizer. It creates one synthesizer for each channel.

Type:

(?id : string?, ?attack : float, ?decay : float,
 ?envelope : bool, ?release : float, ?sustain : float,
 source(audio=pcm(mono), video='a,
 midi=midi(channels=16))) -> source(audio=pcm(mono),
video='a, midi=midi(channels=16))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type float, which defaults to 0.02): Envelope attack (in seconds).
decay (of type float, which defaults to 0.01): Envelope decay (in seconds).
envelope (of type bool, which defaults to true): Use envelope.
release (of type float, which defaults to 0.01): Envelope release (in seconds).
sustain (of type float, which defaults to 0.9): Envelope sustain level.
(unlabeled) (of type source(audio=pcm(mono), video='a, midi=midi(channels=16)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`synth.all.square`

Square synthesizer. It creates one synthesizer for each channel.

Type:

(?id : string?, ?attack : float, ?decay : float,
 ?envelope : bool, ?release : float, ?sustain : float,
 source(audio=pcm(mono), video='a,
 midi=midi(channels=16))) -> source(audio=pcm(mono),
video='a, midi=midi(channels=16))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type float, which defaults to 0.02): Envelope attack (in seconds).
decay (of type float, which defaults to 0.01): Envelope decay (in seconds).
envelope (of type bool, which defaults to true): Use envelope.
release (of type float, which defaults to 0.01): Envelope release (in seconds).
sustain (of type float, which defaults to 0.9): Envelope sustain level.
(unlabeled) (of type source(audio=pcm(mono), video='a, midi=midi(channels=16)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`synth.saw`

Saw synthesizer.

Type:

(?id : string?, ?attack : float, ?channel : int,
 ?decay : float, ?envelope : bool, ?release : float,
 ?sustain : float, ?volume : float,
 source(audio=pcm(mono), video='a,
 midi=midi(channels=1))) -> source(audio=pcm(mono),
video='a, midi=midi(channels=1))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type float, which defaults to 0.02): Envelope attack (in seconds).
channel (of type int, which defaults to 0): MIDI channel to handle.
decay (of type float, which defaults to 0.01): Envelope decay (in seconds).
envelope (of type bool, which defaults to true): Use envelope.
release (of type float, which defaults to 0.05): Envelope release (in seconds).
sustain (of type float, which defaults to 0.9): Envelope sustain level.
volume (of type float, which defaults to 0.3): Initial volume.
(unlabeled) (of type source(audio=pcm(mono), video='a, midi=midi(channels=1)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`synth.sine`

Sine synthesizer.

Type:

(?id : string?, ?attack : float, ?channel : int,
 ?decay : float, ?envelope : bool, ?release : float,
 ?sustain : float, ?volume : float,
 source(audio=pcm(mono), video='a,
 midi=midi(channels=1))) -> source(audio=pcm(mono),
video='a, midi=midi(channels=1))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type float, which defaults to 0.02): Envelope attack (in seconds).
channel (of type int, which defaults to 0): MIDI channel to handle.
decay (of type float, which defaults to 0.01): Envelope decay (in seconds).
envelope (of type bool, which defaults to true): Use envelope.
release (of type float, which defaults to 0.05): Envelope release (in seconds).
sustain (of type float, which defaults to 0.9): Envelope sustain level.
volume (of type float, which defaults to 0.3): Initial volume.
(unlabeled) (of type source(audio=pcm(mono), video='a, midi=midi(channels=1)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`synth.square`

Square synthesizer.

Type:

(?id : string?, ?attack : float, ?channel : int,
 ?decay : float, ?envelope : bool, ?release : float,
 ?sustain : float, ?volume : float,
 source(audio=pcm(mono), video='a,
 midi=midi(channels=1))) -> source(audio=pcm(mono),
video='a, midi=midi(channels=1))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
attack (of type float, which defaults to 0.02): Envelope attack (in seconds).
channel (of type int, which defaults to 0): MIDI channel to handle.
decay (of type float, which defaults to 0.01): Envelope decay (in seconds).
envelope (of type bool, which defaults to true): Use envelope.
release (of type float, which defaults to 0.05): Envelope release (in seconds).
sustain (of type float, which defaults to 0.9): Envelope sustain level.
volume (of type float, which defaults to 0.3): Initial volume.
(unlabeled) (of type source(audio=pcm(mono), video='a, midi=midi(channels=1)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Track Processing

`append`

Append an extra track to every track. Set the metadata ‘liq_append’ to ‘false’ to inhibit appending on one track.

Type:

(?id : string?, ?insert_missing : bool, ?merge : bool,
 source(audio='a, video='b, midi='c),
 (([string * string]) -> source(audio='a, video='b,
  midi='c))) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
insert_missing (of type bool, which defaults to true): Treat track beginnings without metadata as having empty one.
merge (of type bool, which defaults to false): Merge the track with its appended track.
(unlabeled) (of type source(audio='a, video='b, midi='c))
(unlabeled) (of type ([string * string]) -> source(audio='a, video='b, midi='c)): Given the metadata, build the source producing the track to append. This source is allowed to fail (produce nothing) if no relevant track is to be appended.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`blank.detect`

Calls a given handler when detecting a blank.

Type:

(?id : string?, ?max_blank : float, ?min_noise : float,
 ?on_noise : (() -> unit), ?start_blank : bool,
 ?threshold : float, ?track_sensitive : bool,
 (() -> unit), source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
max_blank (of type float, which defaults to 20.): Maximum duration of silence allowed, in seconds.
min_noise (of type float, which defaults to 0.): Minimum duration of noise required to end silence, in seconds.
on_noise (of type () -> unit, which defaults to <fun>): Handler called when noise is detected.
start_blank (of type bool, which defaults to false): Start assuming we have blank.
threshold (of type float, which defaults to -40.): Power in decibels under which the stream is considered silent.
track_sensitive (of type bool, which defaults to true): Reset blank counter at each track.
(unlabeled) (of type () -> unit): Handler called when blank is detected.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_blank (of type () -> bool): Indicate whether blank was detected.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`blank.eat`

Eat blanks, i.e., drop the contents of the stream until it is not blank anymore.

Type:

(?id : string?, ?at_beginning : bool, ?max_blank : float,
 ?min_noise : float, ?start_blank : bool,
 ?threshold : float, ?track_sensitive : bool,
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
at_beginning (of type bool, which defaults to false): Only eat at the beginning of a track.
max_blank (of type float, which defaults to 20.): Maximum duration of silence allowed, in seconds.
min_noise (of type float, which defaults to 0.): Minimum duration of noise required to end silence, in seconds.
start_blank (of type bool, which defaults to false): Start assuming we have blank.
threshold (of type float, which defaults to -40.): Power in decibels under which the stream is considered silent.
track_sensitive (of type bool, which defaults to true): Reset blank counter at each track.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_blank (of type () -> bool): Indicate whether blank was detected.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`blank.skip`

Skip track when detecting a blank.

Type:

(?id : string?, ?threshold : float, ?max_blank : float,
 ?min_noise : float, ?track_sensitive : bool,
 source(audio='a, video='b, midi='c).{skip : () -> unit}) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
threshold (of type float, which defaults to -40.): Power in decibels under which the stream is considered silent.
max_blank (of type float, which defaults to 20.): Maximum silence length allowed, in seconds.
min_noise (of type float, which defaults to 0.): Minimum duration of noise required to end silence, in seconds.
track_sensitive (of type bool, which defaults to true): Reset blank counter at each track.
(unlabeled) (of type source(audio='a, video='b, midi='c).{skip : () -> unit})

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_blank (of type () -> bool): Indicate whether blank was detected.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`blank.strip`

Make the source unavailable when it is streaming blank.

Type:

(?id : string?, ?max_blank : float, ?min_noise : float,
 ?start_blank : bool, ?threshold : float,
 ?track_sensitive : bool, source(audio='a, video='b,
 midi='c)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
max_blank (of type float, which defaults to 20.): Maximum duration of silence allowed, in seconds.
min_noise (of type float, which defaults to 0.): Minimum duration of noise required to end silence, in seconds.
start_blank (of type bool, which defaults to false): Start assuming we have blank.
threshold (of type float, which defaults to -40.): Power in decibels under which the stream is considered silent.
track_sensitive (of type bool, which defaults to true): Reset blank counter at each track.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_blank (of type () -> bool): Indicate whether blank was detected.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`chop`

Regularly insert track boundaries in a stream (useful for testing tracks).

Type:

(?every : {float}, ?metadata : {[string * string]},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

every (of type {float}, which defaults to 3.): Duration of a track (in seconds).
metadata (of type {[string * string]}, which defaults to []): Metadata for tracks.
(unlabeled) (of type source(audio='a, video='b, midi='c)): The stream.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`cross.simple`

Simple transition for crossfade

Type:

(?fade_in : float, ?fade_out : float,
 source(audio=pcm('a), video=internal('b),
 midi=internal('c)), source(audio=pcm('a),
 video=internal('b), midi=internal('c))) ->
source(audio=pcm('a), video=internal('b),
midi=internal('c))

Arguments:

fade_in (of type float, which defaults to 3.): Fade-in duration, if any.
fade_out (of type float, which defaults to 3.): Fade-out duration, if any.
(unlabeled) (of type source(audio=pcm('a), video=internal('b), midi=internal('c))): Ending track
(unlabeled) (of type source(audio=pcm('a), video=internal('b), midi=internal('c))): Starting track

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`cross.smart`

Smart transition for crossfade

Type:

(?log : ((string) -> unit), ?fade_in : float,
 ?fade_out : float,
 ?default : ((source(audio=pcm('a), video=internal('b),
              midi=internal('c)), source(audio=pcm('a),
              video=internal('b), midi=internal('c))) ->
             source(audio=pcm('a), video=internal('b),
             midi=internal('c))),
 ?high : float, ?medium : float, ?margin : float, 'd
 .{
   db_level : float,
   metadata : [string * string],
   source : source(audio=pcm('a),
   video=internal('b),
   midi=internal('c))
 }, 'e
 .{
   db_level : float,
   metadata : [string * string],
   source : source(audio=pcm('a),
   video=internal('b),
   midi=internal('c))
 }) -> source(audio=pcm('a), video=internal('b),
midi=internal('c))

Arguments:

log (of type (string) -> unit, which defaults to <fun>): Default logger
fade_in (of type float, which defaults to 3.): Fade-in duration, if any.
fade_out (of type float, which defaults to 3.): Fade-out duration, if any.
default (of type (source(audio=pcm('a), video=internal('b), midi=internal('c)), source(audio=pcm('a), video=internal('b), midi=internal('c))) -> source(audio=pcm('a), video=internal('b), midi=internal('c)), which defaults to <fun>): Smart crossfade: transition used when no rule applies (default: sequence).
high (of type float, which defaults to -15.): Value, in dB, for loud sound level.
medium (of type float, which defaults to -32.): Value, in dB, for medium sound level.
margin (of type float, which defaults to 4.): Margin to detect sources that have too different sound level for crossing.
(unlabeled) (of type 'd .{ db_level : float, metadata : [string * string], source : source(audio=pcm('a), video=internal('b), midi=internal('c)) }): Ending track
(unlabeled) (of type 'e .{ db_level : float, metadata : [string * string], source : source(audio=pcm('a), video=internal('b), midi=internal('c)) }): Starting track

`crossfade`

Crossfade between tracks, taking the respective volume levels into account in the choice of the transition.

Type:

(?id : string?, ?duration : float,
 ?override_duration : string, ?fade_in : float,
 ?fade_out : float, ?smart : bool,
 ?default : ((source(audio=pcm('a), video=internal('b),
              midi=internal('c)), source(audio=pcm('a),
              video=internal('b), midi=internal('c))) ->
             source(audio=pcm('a), video=internal('b),
             midi=internal('c))),
 ?high : float, ?medium : float, ?margin : float,
 ?deduplicate : bool, ?minimum : float, ?width : float,
 ?conservative : bool, source(audio=pcm('a),
 video=internal('b), midi=internal('c))) ->
source(audio=pcm('a), video=internal('b),
midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float, which defaults to 5.): Duration (in seconds) of buffered data from each track that is used to compute the transition between tracks.
override_duration (of type string, which defaults to "liq_cross_duration"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
fade_in (of type float, which defaults to 3.): Fade-in duration, if any.
fade_out (of type float, which defaults to 3.): Fade-out duration, if any.
smart (of type bool, which defaults to false): Enable smart crossfading
default (of type (source(audio=pcm('a), video=internal('b), midi=internal('c)), source(audio=pcm('a), video=internal('b), midi=internal('c))) -> source(audio=pcm('a), video=internal('b), midi=internal('c)), which defaults to <fun>): Smart crossfade: transition used when no rule applies (default: sequence).
high (of type float, which defaults to -15.): Smart crossfade: value, in dB, for loud sound level.
medium (of type float, which defaults to -32.): Smart crossfade: value, in dB, for medium sound level.
margin (of type float, which defaults to 4.): Smart crossfade: margin to detect sources that have too different sound level for crossing.
deduplicate (of type bool, which defaults to true): Crossfade transitions can generate duplicate metadata. When true, the operator removes duplicate metadata from the returned source.
minimum (of type float, which defaults to -1.): Minimum duration (in sec.) for a cross: If the track ends without any warning (e.g. in case of skip) there may not be enough data for a decent composition. Set to 0. to avoid having transitions after skips, or more to avoid transitions on short tracks. With a negative default, transitions always occur.
width (of type float, which defaults to 2.): Width of the volume analysis window.
conservative (of type bool, which defaults to true): Always prepare for a premature end-of-track.
(unlabeled) (of type source(audio=pcm('a), video=internal('b), midi=internal('c))): The input source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`cue_cut`

Start track after a cue in point and stop it at cue out point. The cue points are given as metadata, in seconds from the beginning of tracks.

Type:

(?id : string?, ?cue_in_metadata : string,
 ?cue_out_metadata : string, ?on_cue_in : (() -> unit),
 ?on_cue_out : (() -> unit), source(audio='a, video='b,
 midi='c)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
cue_in_metadata (of type string, which defaults to "liq_cue_in"): Metadata for cue in points.
cue_out_metadata (of type string, which defaults to "liq_cue_out"): Metadata for cue out points.
on_cue_in (of type () -> unit, which defaults to <fun>): Callback to execute on cue in
on_cue_out (of type () -> unit, which defaults to <fun>): Callback to execute on cue out
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`delay`

Make the source unavailable for a given time between tracks.

Type:

(?id : string?, ?initial : bool, {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
initial (of type bool, which defaults to false): Start in unavailable state, as if a track had just finished.
(unlabeled) (of type {float}): The source won’t be ready less than this amount of seconds after any end of track
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`drop_metadata`

Removes all metadata coming from a source.

Type:

(source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`fallback`

At the beginning of each track, select the first ready child.

Type:

(?id : string?, ?override : string,
 ?replay_metadata : bool, ?track_sensitive : bool,
 ?transition_length : float,
 ?transitions : [(source(audio='a, video='b, midi='c),
                  source(audio='a, video='b, midi='c)) ->
                 source(audio='a, video='b, midi='c)],
 [source(audio='a, video='b, midi='c)]) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
override (of type string, which defaults to "liq_transition_length"): Metadata field which, if present and containing a float, overrides the transition_length parameter.
replay_metadata (of type bool, which defaults to true): Replay the last metadata of a child when switching to it in the middle of a track.
track_sensitive (of type bool, which defaults to true): Re-select only on end of tracks.
transition_length (of type float, which defaults to 5.): Maximum transition duration.
transitions (of type [(source(audio='a, video='b, midi='c), source(audio='a, video='b, midi='c)) -> source(audio='a, video='b, midi='c)], which defaults to []): Transition functions, padded with fun (x,y) -> y functions.
(unlabeled) (of type [source(audio='a, video='b, midi='c)])

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`insert_metadata`

Dynamically insert metadata in a stream. Returns the source decorated with a method insert_metadata which is a function of type (?new_track,metadata)->unit, used to insert metadata in the source. This function also inserts a new track with the given metadata if passed new_track=true.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
insert_metadata (of type (?new_track : bool, [string * string]) -> unit): Insert metadata in the source. The new_track parameter indicates whether a track boundary should also be inserted (by default, no track is inserted).
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`map_first_track`

Apply a function to the first track of a source

Type:

(?id : string?,
 ((source(audio='a, video='b, midi='c)) ->
  source(audio='a, video='b, midi='c)),
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type (source(audio='a, video='b, midi='c)) -> source(audio='a, video='b, midi='c)): The applied function.
(unlabeled) (of type source(audio='a, video='b, midi='c)): The input source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`max_duration`

Limit source duration

Type:

(?id : string?, ?override : string, float,
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
override (of type string, which defaults to "liq_remaining"): Metadata field which, if present and containing a float, overrides the remaining play time.
(unlabeled) (of type float): Maximum duration
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`merge_tracks`

Merge consecutive tracks from the input source. They will be considered as one big track, so on_track() will not trigger for example.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`metadata.artist`

Extract artist from metadata.

Type:

([string * string]) -> string

Arguments:

(unlabeled) (of type [string * string])

`metadata.comment`

Extract comment from metadata.

Type:

([string * string]) -> string

Arguments:

(unlabeled) (of type [string * string])

`metadata.cover`

Extract cover from metadata. This function implements cover extraction for the following formats: coverart (ogg) and apic (flac, mp3).

Type:

(?coverart_mime : string?, [string * string]) -> string
.{mime : string}?

Arguments:

coverart_mime (of type string?, which defaults to null): Mime type to use for "coverart" metadata. Support disasbled if null.
(unlabeled) (of type [string * string]): Metadata from which the cover should be extracted.

`metadata.cover.remove`

Remove cover metadata. This is mostly useful in order not to flood logs with coverart when logging metadata.

Type:

([string * 'a]) -> [string * 'a]

Arguments:

(unlabeled) (of type [string * 'a])

`metadata.deduplicate`

Remove duplicate metadata in source

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to "metadata.deduplicate"): Source id
(unlabeled) (of type source(audio='a, video='b, midi='c)): source

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`metadata.export`

Cleanup metadata for export. This is used to remove Liquidsoap’s internal metadata entries before sending them. List of exported metadata is set using settings.encoder.metadata.export.set.

Type:

([string * string]) -> [string * string]

Arguments:

(unlabeled) (of type [string * string])

`metadata.filename`

Extract filename from metadata.

Type:

([string * string]) -> string

Arguments:

(unlabeled) (of type [string * string])

`metadata.map`

Rewrite metadata on the fly using a function.

Type:

(?id : string?, ?insert_missing : bool, ?strip : bool,
 ?update : bool,
 (([string * string]) -> [string * string]),
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
insert_missing (of type bool, which defaults to true): Treat track beginnings without metadata as having empty ones. The operational order is: create empty if needed, map and strip if enabled.
strip (of type bool, which defaults to false): Completely remove empty metadata. Operates on both empty values and empty metadata chunk.
update (of type bool, which defaults to true): Update metadata. If false, existing metadata are cleared and only returned values are set as new metadata.
(unlabeled) (of type ([string * string]) -> [string * string]): A function that returns new metadata.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`metadata.title`

Extract title from metadata.

Type:

([string * string]) -> string

Arguments:

(unlabeled) (of type [string * string])

`mksafe`

Turn a source into an infaillible source by adding blank when the source is not available.

Type:

(?id : string, source(audio=internal('a),
 video=internal('b), midi=internal('c))) ->
source(audio=internal('a), video=internal('b),
midi=internal('c))

Arguments:

id (of type string, which defaults to "mksafe")
(unlabeled) (of type source(audio=internal('a), video=internal('b), midi=internal('c))): the source to turn infaillible

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`on_offset`

Call a given handler when position in track is equal or more than a given amount of time.

Type:

(?id : string?, ?force : bool, ?offset : float,
 ?override : string,
 ((float, [string * string]) -> unit), source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
force (of type bool, which defaults to false): Force execution of callback if track ends before ‘offset’ position has been reached.
offset (of type float, which defaults to -1.): Execute handler when position in track is equal or more than to this value.
override (of type string, which defaults to "liq_on_offset"): Metadata field which, if present and containing a float, overrides the ‘offset’ parameter.
(unlabeled) (of type (float, [string * string]) -> unit): Function to execute. First argument is the actual position within the current track, second is the latest metadata. That function should be fast because it is executed in the main streaming thread.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`once`

Creates a source that plays only one track of the input source.

Type:

(source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

(unlabeled) (of type source(audio='a, video='b, midi='c)): The input source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`overlap_sources`

Rotate between overlapping sources. Next track starts according to ‘liq_start_next’ offset metadata.

Type:

(?id : string?, ?normalize : bool, ?start_next : string,
 ?weights : [{float}],
 [source(audio=internal('a), video=internal('b),
  midi=internal('c))]) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
normalize (of type bool, which defaults to false)
start_next (of type string, which defaults to "liq_start_next"): Metadata field indicating when the next track should start, relative to current track’s time.
weights (of type [{float}], which defaults to []): Relative weight of the sources in the sum. The empty list stands for the homogeneous distribution.
(unlabeled) (of type [source(audio=internal('a), video=internal('b), midi=internal('c))]): Sources to toggle from

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
insert_metadata (of type (?new_track : bool, [string * string]) -> unit): Insert metadata in the source. The new_track parameter indicates whether a track boundary should also be inserted (by default, no track is inserted).
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`playlog`

Keep a record of played files. This is primarily useful to know when a song was last played and avoid repetitions.

Type:

(?duration : float, ?persistency : string?,
 ?hash : (([string * string]) -> string)) -> unit

Arguments:

duration (of type float, which defaults to inf): Duration (in seconds) after which songs are forgotten. By default, songs are not forgotten which means that the playlog will contain all the songs ever played.
persistency (of type string?, which defaults to null): Set a file name where the values are stored and loaded in case the script is restarted.
hash (of type ([string * string]) -> string, which defaults to <fun>): Function to extract an identifier from the metadata. By default, the filename is used but we could return the artist to know when a song from a given artist was last played for instance.

Methods:

add (of type ([string * string]) -> unit): Record that file with given metadata has been played.
last (of type ([string * string]) -> float): How long ago a file was played (in seconds), infinity is returned if the song has never been played.

`prepend`

Prepend an extra track before every track. Set the metadata ‘liq_prepend’ to ‘false’ to inhibit prepending on one track.

Type:

(?id : string?, ?merge : bool, source(audio='a, video='b,
 midi='c),
 (([string * string]) -> source(audio='a, video='b,
  midi='c))) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
merge (of type bool, which defaults to false): Merge the track with its appended track.
(unlabeled) (of type source(audio='a, video='b, midi='c))
(unlabeled) (of type ([string * string]) -> source(audio='a, video='b, midi='c)): Given the metadata, build the source producing the track to prepend. This source is allowed to fail (produce nothing) if no relevant track is to be appended. However, success must be immediate or it will not be taken into account.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`random`

At the beginning of every track, select a random ready child.

Type:

(?id : string?, ?override : string,
 ?replay_metadata : bool, ?transition_length : float,
 ?transitions : [(source(audio='a, video='b, midi='c),
                  source(audio='a, video='b, midi='c)) ->
                 source(audio='a, video='b, midi='c)],
 ?weights : [{int}],
 [source(audio='a, video='b, midi='c)]) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
override (of type string, which defaults to "liq_transition_length"): Metadata field which, if present and containing a float, overrides the transition_length parameter.
replay_metadata (of type bool, which defaults to true): Replay the last metadata of a child when switching to it in the middle of a track.
transition_length (of type float, which defaults to 5.): Maximum transition duration.
transitions (of type [(source(audio='a, video='b, midi='c), source(audio='a, video='b, midi='c)) -> source(audio='a, video='b, midi='c)], which defaults to []): Transition functions, padded with fun (x,y) -> y functions.
weights (of type [{int}], which defaults to []): Weights of the children (padded with 1), defining for each child the probability that it is selected.
(unlabeled) (of type [source(audio='a, video='b, midi='c)])

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`request.player`

Create a source on which plays immediately requests given with the play method.

Type:

(?simultaneous : bool) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

simultaneous (of type bool, which defaults to true): Allow multiple requests to play simultaneously. If false a new request replaces the previous one.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
length (of type () -> int): Number of currently playing requests.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
play (of type (request) -> unit): Play a request.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set (of type (source(audio=?internal('A), video=?internal('B), midi=?internal('C))) -> unit): Set the source.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`request.queue`

Play a queue of requests (the first added request gets played first).

Type:

(?id : string?, ?interactive : bool, ?prefetch : int,
 ?native : bool, ?queue : [request], ?timeout : float) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
interactive (of type bool, which defaults to true): Should the queue be controllable via telnet?
prefetch (of type int, which defaults to 1): How many requests should be queued in advance.
native (of type bool, which defaults to false): Use native implementation.
queue (of type [request], which defaults to []): Initial queue of requests.
timeout (of type float, which defaults to 20.): Timeout (in sec.) for a single download.

Methods:

add (of type (request) -> bool): This method is internal and should not be used. Consider using push instead.
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
length (of type () -> int): Length of the queue.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
push (of type ((request) -> unit).{uri : (string) -> unit}): Push a request on the request queue.
queue (of type () -> [request]): Get the requests currently in the queue.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set_queue (of type ([request]) -> unit)
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`rotate`

Rotate between sources.

Type:

(?id : string?, ?override : string,
 ?replay_metadata : bool, ?transition_length : float,
 ?transitions : [(source(audio='a, video='b, midi='c),
                  source(audio='a, video='b, midi='c)) ->
                 source(audio='a, video='b, midi='c)],
 ?weights : [{int}],
 [source(audio='a, video='b, midi='c)]) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
override (of type string, which defaults to "liq_transition_length"): Metadata field which, if present and containing a float, overrides the transition_length parameter.
replay_metadata (of type bool, which defaults to true): Replay the last metadata of a child when switching to it in the middle of a track.
transition_length (of type float, which defaults to 5.): Maximum transition duration.
transitions (of type [(source(audio='a, video='b, midi='c), source(audio='a, video='b, midi='c)) -> source(audio='a, video='b, midi='c)], which defaults to []): Transition functions, padded with fun (x,y) -> y functions.
weights (of type [{int}], which defaults to []): Weights of the children (padded with 1), defining for each child how many tracks are played from it per round, if that many are actually available.
(unlabeled) (of type [source(audio='a, video='b, midi='c)])

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`rotate.merge`

Same operator as rotate but merges tracks from each sources. For instance, rotate.merge([intro,main,outro]) creates a source that plays a sequence [intro,main,outro] as single track and loops back.

Type:

(?id : string?,
 ?transitions : [(source(audio=internal('a),
                  video=internal('b), midi=internal('c)),
                  source(audio=internal('a),
                  video=internal('b), midi=internal('c))) ->
                 source(audio=internal('a),
                 video=internal('b), midi=internal('c))],
 ?weights : [{int}],
 [source(audio=internal('a), video=internal('b),
  midi=internal('c))]) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
transitions (of type [(source(audio=internal('a), video=internal('b), midi=internal('c)), source(audio=internal('a), video=internal('b), midi=internal('c))) -> source(audio=internal('a), video=internal('b), midi=internal('c))], which defaults to []): Transition functions, padded with fun (x,y) -> y functions.
weights (of type [{int}], which defaults to []): Weights of the children (padded with 1), defining for each child how many tracks are played from it per round, if that many are actually available.
(unlabeled) (of type [source(audio=internal('a), video=internal('b), midi=internal('c))]): Sequence of sources to be merged

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`sequence`

Play only one track of every successive source, except for the last one which is played as much as available.

Type:

(?id : string?, ?merge : bool,
 [source(audio='a, video='b, midi='c)]) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
merge (of type bool, which defaults to false): Merge tracks when advancing from one source to the next one. This will NOT merge consecutive tracks from the last source; see merge_tracks() if you need that too.
(unlabeled) (of type [source(audio='a, video='b, midi='c)])

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`server.insert_metadata`

Register a server/telnet command to update a source’s metadata. Returns a new source, which will receive the updated metadata. The command has the following format: insert key1=“val1”,key2=“val2”,…

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
insert_metadata (of type (?new_track : bool, [string * string]) -> unit): Insert metadata in the source. The new_track parameter indicates whether a track boundary should also be inserted (by default, no track is inserted).
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.available`

Change the availability of a source depending on a predicate.

Type:

(?id : string?, ?override : bool,
 ?track_sensitive : {bool}, source(audio='a, video='b,
 midi='c), {bool}) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
override (of type bool, which defaults to false): Don’t take availability of original source in account (this can be dangerous and should be avoided).
track_sensitive (of type {bool}, which defaults to false): Change availability only on end of tracks.
(unlabeled) (of type source(audio='a, video='b, midi='c)): Source of which the availability should be changed.
(unlabeled) (of type {bool}): Predicate indicating whether the source should be available or not.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.dynamic`

Dynamically change the underlying source: it can either be changed by the function given as argument, which returns the source to be played, or by calling the set method.

Type:

(?id : string?, ?infallible : bool,
 ?init : source(audio='a, video='b, midi='c)?,
 ?resurection_time : float?, ?track_sensitive : bool,
 ?(() -> source(audio='a, video='b, midi='c)?)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
infallible (of type bool, which defaults to false): Whether the source is infallible or not (be careful when setting this, it will not be checked by the typing system).
init (of type source(audio='a, video='b, midi='c)?, which defaults to null): Initial value for the source
resurection_time (of type float?, which defaults to 1.): When track sensitive and the source is unavailable, how long we should wait before trying to update source again (null means never).
track_sensitive (of type bool, which defaults to false): Whether the source should only be updated on track change.
(unlabeled) (of type () -> source(audio='a, video='b, midi='c)?, which defaults to <fun>): Function returning the source to be used, null means keep current source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set (of type (source(audio='A, video='B, midi='C)) -> unit): Set the source.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

This function is experimental.

`source.frame.duration`

Compute the duration of the last frame.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c
.{frame_duration : float})

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
frame_duration (of type float): Compute the duration of the last frame.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.frame.rms`

Compute the rms of the last frame.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c.{frame_rms : float})

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
frame_rms (of type float): Compute the rms of the last frame.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.on_end`

Call a given handler when there is less than a given amount of time remaining before then end of track.

Type:

(?id : string?, ?delay : {float}, source(audio='a,
 video='b, midi='c),
 ((float, [string * string]) -> unit)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
delay (of type {float}, which defaults to 5.): Execute handler when remaining time is less or equal to this value.
(unlabeled) (of type source(audio='a, video='b, midi='c))
(unlabeled) (of type (float, [string * string]) -> unit): Function to execute. First argument is the remaining time, second is the latest metadata. That function should be fast because it is executed in the main streaming thread.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.on_frame`

Call a given handler on every frame.

Type:

(?id : string?, source(audio='a, video='b, midi='c),
 (() -> unit)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))
(unlabeled) (of type () -> unit): Function called on every frame. It should be fast because it is executed in the main streaming thread.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.on_metadata`

Call a given handler on metadata packets.

Type:

(?id : string?, source(audio='a, video='b, midi='c),
 (([string * string]) -> unit)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))
(unlabeled) (of type ([string * string]) -> unit): Function called on every metadata packet in the stream. It should be fast because it is executed in the main streaming thread.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.on_track`

Call a given handler on new tracks.

Type:

(?id : string?, source(audio='a, video='b, midi='c),
 (([string * string]) -> unit)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))
(unlabeled) (of type ([string * string]) -> unit): Function called on every beginning of track in the stream, with the corresponding metadata as argument. If there is no metadata at the beginning of track, the empty list is passed. That function should be fast because it is executed in the main streaming thread.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.run`

Run a function regularly. This is similar to thread.run but based on a source internal time instead of the world’s time.

Type:

(source(audio='a, video='b, midi='c), ?delay : float,
 ?every : float?, (() -> unit)) -> source(audio='a,
video='b, midi='c)

Arguments:

(unlabeled) (of type source(audio='a, video='b, midi='c)): Source whose time is taken as reference.
delay (of type float, which defaults to 0.): Time to wait before the first run (in seconds).
every (of type float?, which defaults to null): How often to run the function (in seconds). The function is run once if null.
(unlabeled) (of type () -> unit): Function to run.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`source.say_metadata`

Append speech-synthesized tracks reading the metadata.

Type:

(?id : string?,
 ?pattern : (([string * string]) -> string),
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null)
pattern (of type ([string * string]) -> string, which defaults to <fun>): Pattern to use
(unlabeled) (of type source(audio='a, video='b, midi='c)): The source to use

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`switch`

At the beginning of a track, select the first source whose predicate is true.

Type:

(?id : string?, ?all_predicates : bool,
 ?override : string, ?replay_metadata : bool,
 ?single : [bool], ?track_sensitive : {bool},
 ?transition_length : float,
 ?transitions : [(source(audio='a, video='b, midi='c),
                  source(audio='a, video='b, midi='c)) ->
                 source(audio='a, video='b, midi='c)],
 [(() -> bool) * source(audio='a, video='b, midi='c)]) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
all_predicates (of type bool, which defaults to false): Always evaluate all predicates when re-selecting.
override (of type string, which defaults to "liq_transition_length"): Metadata field which, if present and containing a float, overrides the transition_length parameter.
replay_metadata (of type bool, which defaults to true): Replay the last metadata of a child when switching to it in the middle of a track.
single (of type [bool], which defaults to []): Forbid the selection of a branch for two tracks in a row. The empty list stands for [false,...,false].
track_sensitive (of type {bool}, which defaults to true): Re-select only on end of tracks.
transition_length (of type float, which defaults to 5.): Maximum transition duration.
transitions (of type [(source(audio='a, video='b, midi='c), source(audio='a, video='b, midi='c)) -> source(audio='a, video='b, midi='c)], which defaults to []): Transition functions, padded with fun (x,y) -> y functions.
(unlabeled) (of type [(() -> bool) * source(audio='a, video='b, midi='c)]): Sources with the predicate telling when they can be played.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
selected (of type () -> source(audio='A, video='B, midi='C)?): Currently selected source.
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Video Processing

`ffmpeg.filter.video.output`

Return a video source from a filter’s output

Type:

(?id : string?, ?fps : int?, ?pass_metadata : bool,
 ffmpeg.filter.graph, ffmpeg.filter.video) ->
source(audio=none, video=ffmpeg.video.raw('a), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fps (of type int?, which defaults to null): Output frame per seconds. Defaults to global value
pass_metadata (of type bool, which defaults to false): Pass ffmpeg stream metadata to liquidsoap
(unlabeled) (of type ffmpeg.filter.graph)
(unlabeled) (of type ffmpeg.filter.video)

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`image`

Generate a source from a static image.

Type:

(?id : string?, ?fallible : bool, ?string) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Whether we are allowed to fail (in case the file is non-existent or invalid).
(unlabeled) (of type string, which defaults to ""): Path to the image.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
set (of type (string) -> unit): Change the image.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_image`

Add a static image on the first video channel.

Type:

(?id : string?, ?width : int?, ?height : int?,
 ?x : {int}, ?y : {int}, file : string,
 source(audio=internal('a), video=internal('b),
 midi=internal('c))) -> source(audio=internal('a),
video=internal('b), midi=internal('c))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
width (of type int?, which defaults to null): Scale to width
height (of type int?, which defaults to null): Scale to height
x (of type {int}, which defaults to 0): x position.
y (of type {int}, which defaults to 0): y position.
file (of type string): Path to the image file.
(unlabeled) (of type source(audio=internal('a), video=internal('b), midi=internal('c)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_subtitle`

Add subtitle from metadata.

Type:

(?override : string, ?size : int, ?color : int,
 ?offset : int, source(audio=?internal('A),
 video=canvas('B), midi=?internal('C))) ->
source(audio=?internal('A), video=canvas('B),
midi=?internal('C))

Arguments:

override (of type string, which defaults to "subtitle"): Metadata where subtitle to display are located.
size (of type int, which defaults to 18)
color (of type int, which defaults to 16777215)
offset (of type int, which defaults to 20): Offset in pixels.
(unlabeled) (of type source(audio=?internal('A), video=canvas('B), midi=?internal('C))): Source.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_text`

Add a text to a stream. Uses the first available operator in: camlimages, SDL, FFmpeg, GStreamer, gd or native. Display a text using the first available operator in: SDL, GStreamer, gd or native. def video.add_text.native = add_text_builder(video.text.native) end

Type:

(?id : string?, ?duration : float?, ?color : int,
 ?cycle : bool, ?font : string?, ?metadata : string?,
 ?size : int, ?speed : int, ?x : {int}, ?y : {int},
 {string}, source(audio=?internal('A), video=canvas('B),
 midi=?internal('C))) -> source(audio=?internal('A),
video=canvas('B), midi=?internal('C))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null)
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 0): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
(unlabeled) (of type {string}): d Text to display.
(unlabeled) (of type source(audio=?internal('A), video=canvas('B), midi=?internal('C)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_text.camlimages`

Add a text to a stream (camlimages implementation). def video.add_text.native = add_text_builder(video.text.native) end

Type:

(?id : string?, ?duration : float?, ?color : int,
 ?cycle : bool, ?font : string?, ?metadata : string?,
 ?size : int, ?speed : int, ?x : {int}, ?y : {int},
 {string}, source(audio=?internal('A), video=canvas('B),
 midi=?internal('C))) -> source(audio=?internal('A),
video=canvas('B), midi=?internal('C))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null)
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 0): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
(unlabeled) (of type {string}): d Text to display.
(unlabeled) (of type source(audio=?internal('A), video=canvas('B), midi=?internal('C)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_text.ffmpeg.internal`

Display a text.

Type:

(?id : string?, ?color : int, ?cycle : bool,
 ?font : string?, ?duration : float?,
 ?metadata : string?, ?size : int, ?speed : int,
 ?x : {int}, ?y : {int}, {string}, source(audio=pcm('a),
 video=canvas('b), midi=none)) -> source(audio=pcm('c),
video=canvas('d), midi=none)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
duration (of type float?, which defaults to null)
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 70): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
(unlabeled) (of type {string}): d Text to display.
(unlabeled) (of type source(audio=pcm('a), video=canvas('b), midi=none))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_text.ffmpeg.raw`

Display a text. Use this operator inside ffmpeg filters with a input source

Type:

(?color : int, ?cycle : bool, ?font : string?,
 ?metadata : string?, ?size : int, ?speed : int,
 ?x : {int}, ?y : {int}, graph : ffmpeg.filter.graph,
 ?{string}, source(audio=none,
 video=ffmpeg.video.raw('a), midi=none)) ->
ffmpeg.filter.video

Arguments:

color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 70): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
graph (of type ffmpeg.filter.graph): a ffmpeg filter graph to attach this filter to.
(unlabeled) (of type {string}, which defaults to ""): d Text to display.
(unlabeled) (of type source(audio=none, video=ffmpeg.video.raw('a), midi=none))

`video.add_text.ffmpeg.raw.filter`

Display a text. Use this operator inside ffmpeg filters with a ffmpeg video input Returns a ffmpeg video output with on_change and on_metadata methods to be used to update the output text.

Type:

(?color : int, ?cycle : bool, ?font : string?,
 ?metadata : string?, ?size : int, ?speed : int,
 ?x : {int}, ?y : {int}, graph : ffmpeg.filter.graph,
 ?{string}, ffmpeg.filter.video) -> ffmpeg.filter.video

Arguments:

color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 70): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
graph (of type ffmpeg.filter.graph): a ffmpeg filter graph to attach this filter to.
(unlabeled) (of type {string}, which defaults to ""): d Text to display.
(unlabeled) (of type ffmpeg.filter.video)

Methods:

on_change (of type () -> unit)
on_metadata (of type ([string * string]) -> unit)

`video.add_text.native`

Add a text to a stream (native implementation). def video.add_text.native = add_text_builder(video.text.native) end

Type:

(?id : string?, ?duration : float?, ?color : int,
 ?cycle : bool, ?font : string?, ?metadata : string?,
 ?size : int, ?speed : int, ?x : {int}, ?y : {int},
 {string}, source(audio=?internal('A), video=canvas('B),
 midi=?internal('C))) -> source(audio=?internal('A),
video=canvas('B), midi=?internal('C))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null)
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 0): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
(unlabeled) (of type {string}): d Text to display.
(unlabeled) (of type source(audio=?internal('A), video=canvas('B), midi=?internal('C)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.add_text.sdl`

Add a text to a stream (SDL implementation). def video.add_text.native = add_text_builder(video.text.native) end

Type:

(?id : string?, ?duration : float?, ?color : int,
 ?cycle : bool, ?font : string?, ?metadata : string?,
 ?size : int, ?speed : int, ?x : {int}, ?y : {int},
 {string}, source(audio=?internal('A), video=canvas('B),
 midi=?internal('C))) -> source(audio=?internal('A),
video=canvas('B), midi=?internal('C))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null)
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 0): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
(unlabeled) (of type {string}): d Text to display.
(unlabeled) (of type source(audio=?internal('A), video=canvas('B), midi=?internal('C)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.alpha.movement`

Make moving parts visible and non-moving parts transparent. A cheap way to have a bluescreen.

Type:

(?id : string?, ?precision : float, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
precision (of type float, which defaults to 0.2): Precision when comparing pixels to those of previous image (between 0 and 1).
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.alpha.of_color`

Set a color to be transparent.

Type:

(?id : string?, ?color : int, ?precision : float,
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type int, which defaults to 0): Color which should be transparent (in 0xRRGGBB format).
precision (of type float, which defaults to 0.2): Precision in color matching (0. means match precisely the color and 1. means match every color).
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.alpha.remove`

Remove α channel.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.alpha.to_y`

Convert the α channel to Y channel, thus converting opaque (resp. transparent) pixels to bright (resp. dark) ones. This is useful to observe the α channel.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.bounding_box`

Retrieve the origin (methods x / y) and the dimensions (methods width / height) of the bounding box of the video.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
height (of type () -> int): Height of video.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.
width (of type () -> int): Width of video.
x (of type () -> int): x offset of video.
y (of type () -> int): y offset of video.

`video.cover`

Generate a video source containing cover-art for current track of input audio source.

Type:

('b.{on_track : ((([string * string]) -> unit)) -> 'a}) ->
source(audio=none, video='d, midi='e)

Arguments:

(unlabeled) (of type 'b.{on_track : ((([string * string]) -> unit)) -> 'a}): Audio source whose metadata contain cover-art.

`video.crop`

Make the bounding box of the current video start at upper left corner. This is useful to place centered videos for instance.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.dimensions`

Retrieve the dimensions of the video through the width and height methods.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
height (of type () -> int): Height of video.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.
width (of type () -> int): Width of video.

`video.fade.in`

Fade the beginning of tracks. Metadata ‘liq_video_fade_in’ can be used to set the duration for a specific track (float in seconds).

Type:

(?id : string?, ?duration : float, ?override : string,
 ?transition : string, ?type : string, source(audio='a,
 video=canvas('b), midi='c)) -> source(audio='a,
video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float, which defaults to 3.): Duration of the fading. This value can be set on a per-file basis using the metadata field passed as override.
override (of type string, which defaults to "liq_video_fade_in"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
transition (of type string, which defaults to "fade"): Kind of transition (fade|slide_left|slide_right|slide_up|slide_down|grow|disc|random).
type (of type string, which defaults to "lin"): Fader shape (lin|sin|log|exp): linear, sinusoidal, logarithmic or exponential.
(unlabeled) (of type source(audio='a, video=canvas('b), midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.fade.out`

Fade the end of tracks. Metadata ‘liq_video_fade_out’ can be used to set the duration for a specific track (float in seconds).

Type:

(?id : string?, ?duration : float, ?override : string,
 ?transition : string, ?type : string, source(audio='a,
 video=canvas('b), midi='c)) -> source(audio='a,
video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float, which defaults to 3.): Duration of the fading. This value can be set on a per-file basis using the metadata field passed as override.
override (of type string, which defaults to "liq_video_fade_out"): Metadata field which, if present and containing a float, overrides the ‘duration’ parameter for current track.
transition (of type string, which defaults to "fade"): Kind of transition (fade|slide_left|slide_right|slide_up|slide_down|grow|disc|random).
type (of type string, which defaults to "lin"): Fader shape (lin|sin|log|exp): linear, sinusoidal, logarithmic or exponential.
(unlabeled) (of type source(audio='a, video=canvas('b), midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.fill`

Fill frame with a color.

Type:

(?id : string?, ?color : {int}, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type {int}, which defaults to 0): Color to fill the image with (0xRRGGBB).
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.frame.height`

Height for all video frames.

Type:

() -> int

Arguments:

`video.frame.rate`

Framerate for all video frames.

Type:

() -> int

Arguments:

`video.frame.width`

Width for all video frames.

Type:

() -> int

Arguments:

`video.greyscale`

Convert video to greyscale.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.hmirror`

Flip image horizontally.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.invert`

Invert video.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.line`

Draw a line on the video.

Type:

(?id : string?, ?color : {int}, {int * int}, {int * int},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type {int}, which defaults to 16777215): Color to fill the image with (0xRRGGBB).
(unlabeled) (of type {int * int}): Start point.
(unlabeled) (of type {int * int}): End point.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.lomo`

Emulate the “Lomo effect”.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.opacity`

Scale opacity of video.

Type:

(?id : string?, {float}, source(audio='a, video='b,
 midi='c)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type {float}): Coefficient to scale opacity with.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.opacity.box`

Set alpha value on a given box inside the image.

Type:

(?id : string?, alpha : {float}, height : {int},
 width : {int}, ?x : {int}, ?y : {int}, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
alpha (of type {float}): alpha value.
height (of type {int}): Box height.
width (of type {int}): Box width.
x (of type {int}, which defaults to 0): x offset.
y (of type {int}, which defaults to 0): y offset.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.persistence`

Make images of the video persistent.

Type:

(?id : string?, ?duration : {float}, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to 1.): Persistence duration in seconds.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.rectangle`

Draw a rectangle.

Type:

(?id : string?, ?color : {int}, height : {int},
 width : {int}, ?x : {int}, ?y : {int}, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type {int}, which defaults to 0): Color to fill the image with (0xAARRGGBB).
height (of type {int}): Height.
width (of type {int}): Width.
x (of type {int}, which defaults to 0): Horizontal offset.
y (of type {int}, which defaults to 0): Vertical offset.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.render`

Render the video by computing the result of its canvas images.

Type:

(?id : string?, ?transparent : bool, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
transparent (of type bool, which defaults to true): Make uncovered portions of the image transparent (they are black by default).
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.resize`

Resize and translate video.

Type:

(?id : string?, ?height : {int}?, ?width : {int}?,
 ?x : {int}, ?y : {int}, source(audio='a, video='b,
 midi='c)) -> source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
height (of type {int}?, which defaults to null): Target height (null means original height).
width (of type {int}?, which defaults to null): Target width (null means original width).
x (of type {int}, which defaults to 0): x offset.
y (of type {int}, which defaults to 0): y offset.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.rotate`

Rotate video.

Type:

(?id : string?, ?angle : {float}, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
angle (of type {float}, which defaults to 0.): Angle in radians.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.scale`

Scale and translate video.

Type:

(?id : string?, ?scale : {float}, ?x : {int},
 ?xscale : {float}, ?y : {int}, ?yscale : {float},
 source(audio='a, video='b, midi='c)) -> source(audio='a,
video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
scale (of type {float}, which defaults to 1.): Scaling coefficient in both directions.
x (of type {int}, which defaults to 0): x offset.
xscale (of type {float}, which defaults to 1.): x scaling.
y (of type {int}, which defaults to 0): y offset.
yscale (of type {float}, which defaults to 1.): y scaling.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.sepia`

Convert video to sepia.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.still_frame`

Take still frames from a video source by calling the save method. For now only bitmap output is supported.

Type:

(?id : string?, source(audio='a, video=canvas('b),
 midi='c)) -> source(audio='a, video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video=canvas('b), midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
save (of type (string) -> unit): Save current image, argument is the file name to save to.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.testsrc.ffmpeg`

A test video source, which generates various patterns.

Type:

(?id : string?, ?pattern : string, ?max_buffer : float,
 ?duration : 'a?) -> source(audio=none, video=canvas('c),
midi=none)

Arguments:

id (of type string?, which defaults to null)
pattern (of type string, which defaults to "testsrc"): Pattern drawn in the video: "testsrc", "testsrc2", "smptebars" or "rgbtestsrc".
max_buffer (of type float, which defaults to 0.5): Maximum data buffer in seconds
duration (of type 'a?, which defaults to null): Duration of the source.

`video.text`

Display a text.

Type:

(?id : string?, ?color : int, ?duration : float?,
 ?font : string?, ?size : int, {string}) ->
source(audio=?internal('A), video=canvas('B),
midi=?internal('C))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
font (of type string?, which defaults to null): Path to ttf font file.
size (of type int, which defaults to 18): Font size.
(unlabeled) (of type {string}): Text to display.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.text.camlimages`

Display a text.

Type:

(?id : string?, ?color : int, ?duration : float?,
 ?font : string?, ?size : int, {string}) ->
source(audio='a, video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
font (of type string?, which defaults to null): Path to ttf font file.
size (of type int, which defaults to 18): Font size.
(unlabeled) (of type {string}): Text to display.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.text.gd`

Add a text to a stream (GD implementation). def video.add_text.native = add_text_builder(video.text.native) end

Type:

(?id : string?, ?duration : float?, ?color : int,
 ?cycle : bool, ?font : string?, ?metadata : string?,
 ?size : int, ?speed : int, ?x : {int}, ?y : {int},
 {string}, source(audio=?internal('A), video=canvas('B),
 midi=?internal('C))) -> source(audio=?internal('A),
video=canvas('B), midi=?internal('C))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null)
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
cycle (of type bool, which defaults to true): Cycle text when it reaches left boundary.
font (of type string?, which defaults to null): Path to ttf font file.
metadata (of type string?, which defaults to null): Change text on a particular metadata (empty string means disabled).
size (of type int, which defaults to 18): Font size.
speed (of type int, which defaults to 0): Horizontal speed in pixels per second (0 means no scrolling and update according to x and y in case they are variable).
x (of type {int}, which defaults to 10): x offset.
y (of type {int}, which defaults to 10): y offset.
(unlabeled) (of type {string}): d Text to display.
(unlabeled) (of type source(audio=?internal('A), video=canvas('B), midi=?internal('C)))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.text.native`

Display a text.

Type:

(?id : string?, ?color : int, ?duration : float?,
 ?font : string?, ?size : int, {string}) ->
source(audio='a, video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
font (of type string?, which defaults to null): Path to ttf font file.
size (of type int, which defaults to 18): Font size.
(unlabeled) (of type {string}): Text to display.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.text.sdl`

Display a text.

Type:

(?id : string?, ?color : int, ?duration : float?,
 ?font : string?, ?size : int, {string}) ->
source(audio='a, video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
color (of type int, which defaults to 16777215): Text color (in 0xRRGGBB format).
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
font (of type string?, which defaults to null): Path to ttf font file.
size (of type int, which defaults to 18): Font size.
(unlabeled) (of type {string}): Text to display.

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.tile`

Tile sources (same as add but produces tiles of videos).

Type:

(?id : string?, ?normalize : {bool}, ?power : {bool},
 ?proportional : bool, ?weights : [{float}],
 [source(audio='a, video=canvas('b), midi='c)]) ->
source(audio='a, video=canvas('b), midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
normalize (of type {bool}, which defaults to true)
power (of type {bool}, which defaults to false): Perform constant-power normalization.
proportional (of type bool, which defaults to true): Scale preserving the proportions.
weights (of type [{float}], which defaults to []): Relative weight of the sources in the sum. The empty list stands for the homogeneous distribution.
(unlabeled) (of type [source(audio='a, video=canvas('b), midi='c)])

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.translate`

Translate video.

Type:

(?id : string?, ?x : {int}, ?y : {int}, source(audio='a,
 video='b, midi='c)) -> source(audio='a, video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
x (of type {int}, which defaults to 0): x offset.
y (of type {int}, which defaults to 0): y offset.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

Source / Visualization

`bpm`

Detect the BPM (number of beats per minute). The returned source has a method bpm, which can be called to compute it.

Type:

(?id : string?, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

bpm (of type () -> float): Compute the current BPM.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`lufs`

Compute current LUFS of the source according to the EBU R128 standard. It returns the source with a method to compute the current value.

Type:

(?id : string?, ?window : {float}, source(audio=pcm('a),
 video='b, midi='c)) -> source(audio=pcm('a), video='b,
midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
window (of type {float}, which defaults to 3.): Duration of the window (in seconds) used to compute the LUFS.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
lufs (of type () -> float): Current value for the LUFS (short-term value computed over the duration specified by the window parameter).
lufs_momentary (of type () -> float): Momentary LUFS (over a 400ms window).
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`midi.inspect`

Display midi events on standard output.

Type:

(?id : string?, source(audio='a, video='b, midi='c)) ->
source(audio='a, video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio='a, video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`rms.smooth`

Compute the current RMS for the source, this varies more smoothly that rms and is updated more frequently. Returns the source with a method rms.

Type:

(?id : string?, ?duration : {float},
 source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to 0.5): Duration of the window in seconds (more precisely, this is the time constant of the low-pass filter).
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): Current value for the RMS.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`server.rms`

Type:

(?id : string?, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
rms (of type () -> float): Current value for the RMS volume.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

`video.volume`

Graphical visualization of the sound.

Type:

(?id : string?, source(audio=pcm('a), video='b, midi='c)) ->
source(audio=pcm('a), video='b, midi='c)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source(audio=pcm('a), video='b, midi='c))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.

String

`%`

pattern % [...,(k,v),...] changes in the pattern occurrences of:

$(k) into v
`$(if $(k2),“a”,“b”) into “a” if k2 is found in the list, “b” otherwise.

Type:

(string, [string * string]) -> string

Arguments:

(unlabeled) (of type string)
(unlabeled) (of type [string * string])

`^`

Concatenate strings.

Type:

(string, string) -> string

Arguments:

(unlabeled) (of type string)
(unlabeled) (of type string)

`bool_of_string`

Convert a string to a bool.

Type:

(?default : bool, string) -> bool

Arguments:

default (of type bool, which defaults to false)
(unlabeled) (of type string)

`file.metadata.flac.cover.decode`

Decode a flac-encoded cover metadata string

Type:

(string) -> string
.{
  color_depth : int,
  description : string,
  height : int,
  mime : string,
  number_of_colors : int?,
  picture_type : int,
  width : int}?

Arguments:

(unlabeled) (of type string)

`file.metadata.flac.cover.encode`

Encode cover metadata for embedding with flac files

Type:

(picture_type : int, mime : string,
 ?description : string, width : int, height : int,
 color_depth : int, ?number_of_colors : int?, string) ->
string

Arguments:

picture_type (of type int)
mime (of type string)
description (of type string, which defaults to "")
width (of type int)
height (of type int)
color_depth (of type int)
number_of_colors (of type int?, which defaults to null)
(unlabeled) (of type string)

`float_of_string`

Convert a string to a float.

Type:

(?default : float, string) -> float

Arguments:

default (of type float, which defaults to 0.)
(unlabeled) (of type string)

`int_of_string`

Convert a string to a int.

Type:

(?default : int, string) -> int

Arguments:

default (of type int, which defaults to 0)
(unlabeled) (of type string)

`json`

Create a generic json object

Type:

() -> json

Arguments:

Methods:

add (of type (string, 'a) -> unit): Add or replace a new key/value pair to the object.
remove (of type (string) -> unit): Remove a key from the object. Does not nothing if the key does not exist.
stringify (of type (?compact : bool, ?json5 : bool) -> string): Render object as json string.

`json.stringify`

Convert a value to a JSON string.

Type:

(?compact : bool, ?json5 : bool, 'a) -> string

Arguments:

compact (of type bool, which defaults to false): Output compact text.
json5 (of type bool, which defaults to false): Use JSON5 extended spec.
(unlabeled) (of type 'a)

`metadata.json.parse`

Parse metadata from JSON object

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string)

`regexp`

Create a regular expression

Type:

(?flags : [string], string) -> regexp

Arguments:

flags (of type [string], which defaults to []): List of flags. Valid flags: "i", "g", "s", "m".
(unlabeled) (of type string)

Methods:

exec (of type (string) -> [int * string]): Extract substrings from a string. Returns a list of (index,value). If the list does not have a pair associated to some index, it means that the corresponding pattern was not found.
replace (of type (((string) -> string), string) -> string): Replace all substrings matched by a pattern by another string returned by a function.
split (of type (string) -> [string]): Split a string on the given regular expression.
test (of type (string) -> bool): Match a string with the expressionn.

`string`

Ensure that we have a string (useful for removing fields from strings).

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`string.annotate.parse`

Parse a string of the form <key>=<value>,...:<uri> as given by the annotate: protocol

Type:

(string) -> [string * string] * string

Arguments:

(unlabeled) (of type string)

`string.base64.decode`

Decode a Base64 encoded string.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`string.base64.encode`

Encode a string in Base64.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`string.binary.of_int`

Encode a positive (unsigned) integer using native memory representation.

Type:

(?pad : int, ?little_endian : bool, int) -> string

Arguments:

pad (of type int, which defaults to 0): Minimum length in digits (pad on the left with zeros in order to reach it)
little_endian (of type bool, which defaults to true): Whether the memory representation is little endian.
(unlabeled) (of type int): String containing the binary representation.

`string.binary.to_int`

Value of a positive (unsigned) integer encoded using native memory representation.

Type:

(?little_endian : bool, string) -> int

Arguments:

little_endian (of type bool, which defaults to true): Whether the memory representation is little endian.
(unlabeled) (of type string): String containing the binary representation.

`string.capitalize`

Return a string with the first character set to upper case (capitalize), or to lower case (uncapitalize).

Type:

(?capitalize : bool, ?space_sensitive : bool, string) ->
string

Arguments:

capitalize (of type bool, which defaults to true): Capitalize if true, uncapitalize otherwise
space_sensitive (of type bool, which defaults to true): Capitalize each space separated sub-string.
(unlabeled) (of type string)

`string.case`

Convert a string to lower or upper case.

Type:

(?lower : bool, string) -> string

Arguments:

lower (of type bool, which defaults to true): Convert to lower case if true and uppercase otherwise.
(unlabeled) (of type string)

`string.concat`

Concatenate strings.

Type:

(?separator : string, [string]) -> string

Arguments:

separator (of type string, which defaults to "")
(unlabeled) (of type [string])

`string.contains`

Test whether a string contains a given prefix, substring or suffix.

Type:

(?prefix : string, ?substring : string, ?suffix : string,
 string) -> bool

Arguments:

prefix (of type string, which defaults to ""): Prefix to look for.
substring (of type string, which defaults to ""): Substring to look for.
suffix (of type string, which defaults to ""): Suffix to look for.
(unlabeled) (of type string): The string to look into.

`string.data_uri.decode`

Decode a string using the data uri format, i.e. "data:<mime>[;base64]:<data>".

Type:

(string) -> string.{mime : string}?

Arguments:

(unlabeled) (of type string)

`string.data_uri.encode`

Encode a string using the data uri format, i.e. "data:<mime>[;base64]:<data>".

Type:

(?base64 : bool, mime : string, string) -> string

Arguments:

base64 (of type bool, which defaults to true): Encode data using the base64 format
mime (of type string): Data mime type
(unlabeled) (of type string)

`string.escape`

Escape special characters in an string. By default, the string is assumed to be "utf8" encoded and is escaped following JSON and javascript specification.

Type:

(?special_char : ((string) -> bool)?,
 ?escape_char : ((string) -> string)?,
 ?encoding : string, string) -> string

Arguments:

special_char (of type ((string) -> bool)?, which defaults to null): Return true if the given character (passed as a string) should be escaped. Defaults to control charaters for "utf8" and control characters and any character above \x7E (non-printable characters) for "ascii".
escape_char (of type ((string) -> string)?, which defaults to null): Function used to escape a character. Defaults to \xxx octal notation for "ascii" and \uxxxx hexadecimal notation for "utf8".
encoding (of type string, which defaults to "utf8"): One of: "ascii" or "utf8".
(unlabeled) (of type string)

`string.escape.all`

Escape each character in the given string using a specific escape sequence

Type:

(?format : string, string) -> string

Arguments:

format (of type string, which defaults to "utf8"): Escape format. One of: "octal", "hex" or "utf8".
(unlabeled) (of type string)

`string.escape.special_char`

Default function to detect characters to escape. See string.escape for more details.

Type:

(?encoding : string, string) -> bool

Arguments:

encoding (of type string, which defaults to "utf8"): One of: "ascii" or "utf8".
(unlabeled) (of type string)

`string.extract`

Extract substrings from a string. Perl compatible regular expressions are recognized. Hence, special characters should be escaped. Returns a list of (index,value). If the list does not have a pair associated to some index, it means that the corresponding pattern was not found. Alter natively, one can use the r/_/.exec(_) syntax for regular expressions.

Type:

(pattern : string, string) -> [int * string]

Arguments:

pattern (of type string)
(unlabeled) (of type string)

`string.hex_of_int`

Hexadecimal representation of an integer.

Type:

(?pad : int, int) -> string

Arguments:

pad (of type int, which defaults to 0): Minimum length in digits (pad on the left with zeros in order to reach it).
(unlabeled) (of type int)

`string.id`

Generate an identifier with given operator name.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string): Operator name.

`string.id.default`

Generate an identifier if no identifier was provided.

Type:

(default : string, string?) -> string

Arguments:

default (of type string): Name from which identifier is generated if not present.
(unlabeled) (of type string?): Proposed identifier.

`string.is_int`

Test whether a string is a valid integer.

Type:

(string) -> bool

Arguments:

(unlabeled) (of type string)

`string.length`

Get the length of a string.

Type:

(string) -> int

Arguments:

(unlabeled) (of type string)

`string.make`

Create a string of a given length using the given character.

Type:

(?char_code : int, int) -> string

Arguments:

char_code (of type int, which defaults to 32): Character code.
(unlabeled) (of type int): String length.

`string.match`

Match a string with an expression. Perl compatible regular expressions are recognized. Hence, special characters should be escaped. Alternatively, one can use the the r/_/.test(_) syntax for regular expressions.

Type:

(pattern : string, string) -> bool

Arguments:

pattern (of type string)
(unlabeled) (of type string)

`string.nth`

Retrieve a character in a string. Raises error.not_found if character does not exist.

Type:

(string, int) -> int

Example:

c = string.nth("abcde", 2)
print(c) # should print "c"

Arguments:

(unlabeled) (of type string): String to look into.
(unlabeled) (of type int): Index of the character.

`string.null_terminated`

Add a null character at the end of a string.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string): String.

`string.quote`

Return a quoted copy of the given string. By default, the string is assumed to be "utf8" encoded and is escaped following JSON and javascript specification.

Type:

(?encoding : string, string) -> string

Arguments:

encoding (of type string, which defaults to "utf8"): One of: "ascii" or "utf8".
(unlabeled) (of type string)

`string.recode`

Convert a string. Effective only if Camomile is enabled.

Type:

(?in_enc : string?, ?out_enc : string, string) -> string

Arguments:

in_enc (of type string?, which defaults to null): Input encoding. Autodetected if null.
out_enc (of type string, which defaults to "UTF-8"): Output encoding.
(unlabeled) (of type string)

`string.replace`

Replace all substrings matched by a pattern by another string returned by a function. Alternatively, one can use the r/_/g.replace(_) syntax for regular expressions.

Type:

(pattern : string, ((string) -> string), string) ->
string

Arguments:

pattern (of type string): Pattern (regular expression) of substrings which should be replaced.
(unlabeled) (of type (string) -> string): Function getting a matched substring an returning the string to replace it with.
(unlabeled) (of type string): String whose substrings should be replaced.

`string.split`

Split a string at “separator”. Perl compatible regular expressions are recognized. Hence, special characters should be escaped. Alternatively, one can use the r/_/.split(_) syntax for regular expressions.

Type:

(separator : string, string) -> [string]

Arguments:

separator (of type string)
(unlabeled) (of type string)

`string.sub`

Get a substring of a string. Returns “” if no such substring exists.

Type:

(string, start : int, length : int) -> string

Arguments:

(unlabeled) (of type string)
start (of type int): Return a sub string starting at this position. First position is 0.
length (of type int): Return a sub string of length characters.

`string.to_float`

Convert a string to a float.

Type:

(?default : float, string) -> float

Arguments:

default (of type float, which defaults to 0.)
(unlabeled) (of type string)

`string.to_int`

Convert a string to a int.

Type:

(?default : int, string) -> int

Arguments:

default (of type int, which defaults to 0)
(unlabeled) (of type string)

`string.trim`

Return a string without leading and trailing whitespace.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`string.unescape`

This function is the inverse of string.escape.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string)

`string_of`

Return the representation of a value.

Type:

(?fields : bool, 'a) -> string

Arguments:

fields (of type bool, which defaults to false): Show toplevel fields around the value.
(unlabeled) (of type 'a)

`string_of_float`

String representation of a float

Type:

(?decimal_places : int?, float) -> string

Arguments:

decimal_places (of type int?, which defaults to null): Number of decimal places.
(unlabeled) (of type float)

`string_of_metadata`

Standard function for displaying metadata. Shows artist and title, using “Unknown” when a field is empty.

Type:

([string * string]) -> string

Arguments:

(unlabeled) (of type [string * string]): Metadata packet to be displayed.

`url.decode`

Decode an encoded url (e.g. “%20” becomes ” “).

Type:

(?plus : bool, string) -> string

Arguments:

plus (of type bool, which defaults to true)
(unlabeled) (of type string)

`url.encode`

Encode an url (e.g. ” ” becomes “%20”).

Type:

(?plus : bool, string) -> string

Arguments:

plus (of type bool, which defaults to true)
(unlabeled) (of type string)

`url.split`

Split an url of the form foo?arg=bar&arg2=bar2 into ("foo",[("arg","bar"),("arg2","bar2")]). The returned strings are decoded (see url.decode).

Type:

(string) -> string * [string * string]

Arguments:

(unlabeled) (of type string): Url to split.

`url.split_args`

Split the arguments of an url of the form arg=bar&arg2=bar2 into [("arg","bar"),("arg2","bar2")]. The returned strings are decoded (see url.decode).

Type:

(string) -> [string * string]

Arguments:

(unlabeled) (of type string): Argument string to split.

String

`metadata.json.stringify`

Export metadata as JSON object. Cover art, if found, is extracted using metadata.cover and exported with key "cover" and exported using string.data_uri.encode.

Type:

(?coverart_mime : string?, ?base64 : bool,
 ?compact : bool, ?json5 : bool, [string * string]) ->
string

Arguments:

coverart_mime (of type string?, which defaults to null): Mime type to use for "coverart" metadata. Support disasbled if null.
base64 (of type bool, which defaults to true)
compact (of type bool, which defaults to false): Output compact text.
json5 (of type bool, which defaults to false): Use json5 extended spec.
(unlabeled) (of type [string * string])

System

`argv`

Get command-line parameters. The parameters are numbered starting from 1, the zeroth parameter being the script name.

Type:

(?default : string, int) -> string

Arguments:

default (of type string, which defaults to "")
(unlabeled) (of type int)

`environment`

Return the process environment.

Type:

() -> [string * string]

Arguments:

`exe_ext`

Executable file extension.

Type:

string

Arguments:

`exit`

Immediately stop the application. This should only be used in extreme cases or to specify an exit value. The recommended way of stopping Liquidsoap is to use shutdown.

Type:

(int) -> unit

Arguments:

(unlabeled) (of type int): Exit value.

`file.cover`

Obtain cover-art for a file. An empty string is returned in case there is no such information.

Type:

(string) -> string.{mime : string}?

Arguments:

(unlabeled) (of type string): File from which the cover should be obtained

`getenv`

Get the value associated to a variable in the process environment. Returns “” if the variable is not set.

Type:

(?default : string, string) -> string

Arguments:

default (of type string, which defaults to "")
(unlabeled) (of type string)

`getopt`

Parse command line options: getopt("-o") returns “1” if “-o” was passed without any parameter, “0” otherwise. getopt(default="X","-o") returns “Y” if “-o Y” was passed, “X” otherwise. The result is removed from the list of arguments, affecting subsequent calls to argv() and getopt().

Type:

(?default : string, string) -> string

Arguments:

default (of type string, which defaults to "")
(unlabeled) (of type string)

`getpid`

Get the process’ pid.

Type:

() -> int

Arguments:

`on_shutdown`

Type:

((() -> unit)) -> unit

Arguments:

(unlabeled) (of type () -> unit)

`on_start`

Type:

((() -> unit)) -> unit

Arguments:

(unlabeled) (of type () -> unit)

`os.type`

Type of OS running liquidsoap.

Type:

string

Arguments:

`process.quote`

Return a quoted copy of the given string, suitable for use as one argument in a command line, escaping all meta-characters. Warning: under Windows, the output is only suitable for use with programs that follow the standard Windows quoting conventions.

Type:

(string) -> string

Arguments:

(unlabeled) (of type string): String to escape

`process.read`

Perform a shell call and return its output.

Type:

(?timeout : float, ?env : [string * string],
 ?inherit_env : bool, ?log_errors : bool, string) ->
string

Arguments:

timeout (of type float, which defaults to -1.): Cancel process after timeout has elapsed. Ignored if negative.
env (of type [string * string], which defaults to []): Process environment
inherit_env (of type bool, which defaults to true): Inherit calling process’s environment when env parameter is empty.
log_errors (of type bool, which defaults to true): Log details if the command does not return 0.
(unlabeled) (of type string): Command to run

`process.read.lines`

Perform a shell call and return the list of its output lines.

Type:

(?timeout : float, ?env : [string * string],
 ?inherit_env : bool, ?log_errors : bool, string) ->
[string]

Arguments:

timeout (of type float, which defaults to -1.): Cancel process after timeout has elapsed. Ignored if negative.
env (of type [string * string], which defaults to []): Process environment
inherit_env (of type bool, which defaults to true): Inherit calling process’s environment when env parameter is empty.
log_errors (of type bool, which defaults to true): Log details if the command does not return 0.
(unlabeled) (of type string): Command to run

`process.run`

Run a process in a shell environment. Returns the standard output, as well as standard error and status as methods. The status can be “exit” (the status code is set), “killed” or “stopped” (the status code is the signal), or “exception” (the description is set) or “timeout” (the description is the run time).

Type:

(?env : [string * string], ?inherit_env : bool,
 ?rwdirs : [string], ?rodirs : [string],
 ?network : bool?, ?timeout : float?, string) -> unit

Arguments:

env (of type [string * string], which defaults to []): Process environment
inherit_env (of type bool, which defaults to true): Inherit calling process’s environment when env parameter is empty.
rwdirs (of type [string], which defaults to ["default"]): Read/write directories for sandboxing. "default" expands to sandbox default.
rodirs (of type [string], which defaults to ["default"]): Read-only directories for sandboxing "default" expands to sandbox default.
network (of type bool?, which defaults to null): Enable or disable network inside sandboxed environment (sandbox default if not specified).
timeout (of type float?, which defaults to null): Cancel process after timeout has elapsed. Ignored if negative.
(unlabeled) (of type string): Command to run

Methods:

status (of type string.{code : int, description : string}): Status when process ended, can be one of "exit" (the program exited, the status code is then relevant), "killed" (the program was killed by signal given in status code), "stopped" (the program was stopped by signal given in status code) or "exception" (the program raised and exception detailed in the description).
stderr (of type string): Messages written by process on standard error stream.
stdout (of type string): Messages written by process on standard output stream.

`process.test`

Return true if process exited with 0 code.

Type:

(?timeout : float, ?env : [string * string],
 ?inherit_env : bool, string) -> bool

Arguments:

timeout (of type float, which defaults to -1.): Cancel process after timeout has elapsed. Ignored if negative.
env (of type [string * string], which defaults to []): Process environment
inherit_env (of type bool, which defaults to true): Inherit calling process’s environment when env parameter is empty.
(unlabeled) (of type string): Command to test

`read`

Read some value from standard input (console).

Type:

(?hide : bool) -> string

Arguments:

hide (of type bool, which defaults to false): Hide typed characters (for passwords).

`reopen.stderr`

Reopen standard error on the given file

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`reopen.stdin`

Reopen standard input on the given file

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`reopen.stdout`

Reopen standard output on the given file

Type:

(string) -> unit

Arguments:

(unlabeled) (of type string)

`restart`

Restart the application.

Type:

() -> unit

Arguments:

`setenv`

Set the value associated to a variable in the process environment.

Type:

(string, string) -> unit

Arguments:

(unlabeled) (of type string): Variable to be set.
(unlabeled) (of type string): Value to set.

`shutdown`

Shutdown the application.

Type:

(?code : int) -> unit

Arguments:

code (of type int, which defaults to 0): Exit code. Default: 0

`sleep`

Sleep for a given amount of seconds (beware that it freezes the thread executing it).

Type:

(float) -> unit

Arguments:

(unlabeled) (of type float): Number of seconds of sleep.

`source.is_up`

Check whether a source is up.

Type:

(source('a)) -> bool

Arguments:

(unlabeled) (of type source('a))

`source.on_leave`

Type:

(source('a), (() -> unit)) -> unit

Arguments:

(unlabeled) (of type source('a))
(unlabeled) (of type () -> unit)

`source.on_shutdown`

Type:

(source('a), (() -> unit)) -> unit

Arguments:

(unlabeled) (of type source('a))
(unlabeled) (of type () -> unit)

`thread.when`

Execute a given action when a predicate is true.

Type:

(?fast : bool, ?every : float, ?once : bool,
 ?changed : bool, (() -> bool), (() -> unit)) -> unit

Arguments:

fast (of type bool, which defaults to true)
every (of type float, which defaults to 1.): How often (in sec.) to check for the predicate.
once (of type bool, which defaults to false): Execute the function only once.
changed (of type bool, which defaults to true): Execute the function only if the predicate was false when last checked.
(unlabeled) (of type () -> bool): Predicate indicating when to execute the function, typically a time interval such as {10h-10h30}.
(unlabeled) (of type () -> unit): Function to execute when the predicate is true.

`time`

Return the current time since 00:00:00 GMT, Jan. 1, 1970, in seconds.

Type:

() -> float

Arguments:

`time.local`

Convert a time in seconds into a date in the local time zone (current time is used if no argument is provided).

Type:

(?float?) -> unit

Arguments:

(unlabeled) (of type float?, which defaults to null)

Methods:

day (of type int): Day of month.
dst (of type bool): Daylight time savings in effect.
hour (of type int): Hours.
min (of type int): Minutes.
month (of type int): Month of year.
sec (of type int): Seconds.
week_day (of type int): Day of week (Sunday is 0 or 7, Saturday is 6).
year (of type int): Year.
year_day (of type int): Day of year.

`time.up`

Current time, in seconds, since the script has started.

Type:

() -> float

Arguments:

`time.utc`

Convert a time in seconds into a date in the UTC time zone (current time is used if no argument is provided). Fields meaning same as POSIX’s tm struct. In particular, “year” is: year - 1900, i.e. 117 for 2017!

Type:

(?float?) -> unit

Arguments:

(unlabeled) (of type float?, which defaults to null)

Methods:

day (of type int): Day of month.
dst (of type bool): Daylight time savings in effect.
hour (of type int): Hours.
min (of type int): Minutes.
month (of type int): Month of year.
sec (of type int): Seconds.
week_day (of type int): Day of week (Sunday is 0 or 7, Saturday is 6).
year (of type int): Year.
year_day (of type int): Day of year.

Visualization

`video.vumeter`

VU meter: display the audio volume (RMS in dB). This adds a video track to the source.

Type:

(?rms_min : float, ?rms_max : float, ?window : float,
 ?color : int, ?persistence : float,
 source(audio=pcm('a), video=none, midi='b)) ->
source(audio=pcm('a), video=internal('c), midi='b)

Arguments:

rms_min (of type float, which defaults to -35.): Minimal volume (dB).
rms_max (of type float, which defaults to 0.): Maximal volume (dB).
window (of type float, which defaults to 0.1): Duration in seconds of volume computation.
color (of type int, which defaults to 16711680): Color of the display (0xRRGGBB).
persistence (of type float, which defaults to 0.): Persistence of the display (s).
(unlabeled) (of type source(audio=pcm('a), video=none, midi='b))

Methods:

duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int?).{set : (int) -> unit}}): Get or set the source’s log level, from 1 to 5.
on_get_ready (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source’s final ID is set.
on_leave (of type ((() -> unit)) -> unit): Register a function to be called when source is not used anymore by another source.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
remaining (of type () -> float): Estimation of remaining time in the current track.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source’s time, based on its assigned clock.