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full lpcm support in mov audio stsd v2

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Originally committed as revision 14524 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-08-03 18:37:35 +00:00
parent 14b7062829
commit 2288834f87
1 changed files with 37 additions and 2 deletions
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39
libavformat/mov.c
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@ -665,6 +665,41 @@ static int mov_read_stco(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
return 0;
}
/**
* Compute codec id for 'lpcm' tag.
* See CoreAudioTypes and AudioStreamBasicDescription at Apple.
*/
static int mov_get_lpcm_codec_id(int bps, int flags)
{
if (flags & 1) { // floating point
if (flags & 2) { // big endian
if (bps == 32) return CODEC_ID_PCM_F32BE;
//else if (bps == 64) return CODEC_ID_PCM_F64BE;
} else {
//if (bps == 32) return CODEC_ID_PCM_F32LE;
//else if (bps == 64) return CODEC_ID_PCM_F64LE;
}
} else {
if (flags & 2) {
if (bps == 8)
// signed integer
if (flags & 4) return CODEC_ID_PCM_S8;
else return CODEC_ID_PCM_U8;
else if (bps == 16) return CODEC_ID_PCM_S16BE;
else if (bps == 24) return CODEC_ID_PCM_S24BE;
else if (bps == 32) return CODEC_ID_PCM_S32BE;
} else {
if (bps == 8)
if (flags & 4) return CODEC_ID_PCM_S8;
else return CODEC_ID_PCM_U8;
if (bps == 16) return CODEC_ID_PCM_S16LE;
else if (bps == 24) return CODEC_ID_PCM_S24LE;
else if (bps == 32) return CODEC_ID_PCM_S32LE;
}
}
return 0;
}
static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
@ -865,8 +900,8 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
flags = get_be32(pb); /* lcpm format specific flag */
sc->bytes_per_frame = get_be32(pb); /* bytes per audio packet if constant */
sc->samples_per_frame = get_be32(pb); /* lpcm frames per audio packet if constant */
if (flags & 2) // big endian
st->codec->codec_id = CODEC_ID_PCM_S16BE;
if (format == MKTAG('l','p','c','m'))
st->codec->codec_id = mov_get_lpcm_codec_id(st->codec->bits_per_sample, flags);
}
}