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aiff: add support for XA ADPCM 

Certain AIFF files encode XA ADPCM compressed audio using a chunk
with the tag `APCM`. Aside from this custom chunk type, they're
otherwise standard AIFF files. I've only observed these files in the
Sega Saturn game Sonic Jam so far.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Misty De Meo 2018-01-03 19:14:22 +11:00 committed by Michael Niedermayer
parent 8d9c9775b2
commit fde057dfb2
1 changed files with 7 additions and 0 deletions
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7
libavformat/aiffdec.c
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@ -325,6 +325,13 @@ static int aiff_read_header(AVFormatContext *s)
if(ff_mov_read_chan(s, pb, st, size) < 0)
return AVERROR_INVALIDDATA;
break;
case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;
aiff->data_end = avio_tell(pb) + size;
offset = avio_tell(pb) + 8;
/* This field is unknown and its data seems to be irrelevant */
avio_rb32(pb);
st->codecpar->block_align = avio_rb32(pb);
case 0:
if (offset > 0 && st->codecpar->block_align) // COMM && SSND
goto got_sound;