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matroska: implement support for ALAC

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Support Matroska native formatting.

On demuxing reconstruct the 36-bytes QuickTime atom that the ALAC
decoder expects by prepending the "atom size", "tag" and
"tag version" fields missing from the Matroska's CodecPrivate
element.

On muxing remove the initial 12 bytes

Sample files are available:
http://www.bunkus.org/videotools/mkvtoolnix/samples/alac/alac-in-matroska.mka
and the CoreAudio file it was created from with today's mkvmerge:
http://www.bunkus.org/videotools/mkvtoolnix/samples/alac/alac-in-matroska-source.caf

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Moritz Bunkus
2012-09-14 22:26:14 +02:00
committed by Luca Barbato
parent 870e75524a
commit 8071dca3d5
3 changed files with 24 additions and 0 deletions
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libavformat/matroska.c
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@@ -24,6 +24,7 @@
const CodecTags ff_mkv_codec_tags[]={
{"A_AAC" , AV_CODEC_ID_AAC},
{"A_AC3" , AV_CODEC_ID_AC3},
{"A_ALAC" , AV_CODEC_ID_ALAC},
{"A_DTS" , AV_CODEC_ID_DTS},
{"A_EAC3" , AV_CODEC_ID_EAC3},
{"A_FLAC" , AV_CODEC_ID_FLAC},