Add support for MPEG-4 ALS to the MP4 demuxer and FFmpeg wrapper.
MPEG-4 ALS is a pure losses audio codec from MPEG. Like other MPEG-4 Audio variants it's muxed into the MP4 container with Object Type Indication 0x40 followed by its Audio Object Type (36). Sample: http://streams.videolan.org/Mpeg_Conformance/ftp.iis.fhg.de/mpeg4audio-conformance/compressedMp4/als_00_2ch48k16b.mp4Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
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