aac_mimes = ["audio/aac", "audio/aacp", "audio/3gpp", "audio/3gpp2", "audio/mp4",
"audio/MP4A-LATM", "audio/mpeg4-generic", "audio/x-hx-aac-adts"]
aac_filexts = ["m4a", "m4b", "m4p", "m4v",
"m4r", "3gp", "mp4", "aac"]
# Faad is not very selective so
# We are checking only file that
# end with a known extension or mime type
def faad_test(file) =
# Get the file's mime
mime = get_mime(file)
# Test mime
if list.mem(mime,aac_mimes) then
true
else
# Otherwise test file extension
ret = string.extract(pattern='\.(.+)$',file)
if list.length(ret) != 0 then
ext = ret["1"]
list.mem(ext,aac_filexts)
else
false
end
end
end
if test_process("which faad") then
log(level=3,"Found faad binary: enabling external faad decoder and \
metadata resolver.")
faad_p = (fun (f) -> "faad -w #{quote(f)} 2>/dev/null")
def test_faad(file) =
if faad_test(file) then
channels = list.hd(default="",get_process_lines("faad -i #{quote(file)} 2>&1 | \
grep 'ch,'"))
ret = string.extract(pattern=", (\d) ch,",channels)
ret =
if list.length(ret) == 0 then
# If we pass the faad_test, chances are
# high that the file will contain aac audio data..
"-1"
else
ret["1"]
end
int_of_string(default=(-1),ret)
else
0
end
end
add_oblivious_decoder(name="FAAD",description="Decode files using \
the faad binary.", test=test_faad, faad_p)
def faad_meta(file) =
if faad_test(file) then
ret = get_process_lines("faad -i \
#{quote(file)} 2>&1")
# Yea, this is tuff programming (again) !
def get_meta(l,s)=
ret = string.extract(pattern="^(\w+):\s(.+)$",s)
if list.length(ret) > 0 then
list.append([(ret["1"],ret["2"])],l)
else
l
end
end
list.fold(get_meta,[],ret)
else
[]
end
end
add_metadata_resolver("FAAD",faad_meta)
end
