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Read the number of channels from the 'dac3' tag for AC-3 in MP4.

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Originally committed as revision 25054 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-09-06 21:52:11 +00:00
parent 0f146263aa
commit bdecdd2bfc
1 changed files with 16 additions and 0 deletions
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16
libavformat/mov.c
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@ -559,6 +559,21 @@ static int mov_read_esds(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
return ff_mov_read_esds(c->fc, pb, atom);
}
static int mov_read_dac3(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
{
AVStream *st;
int ac3info, acmod, lfeon;
st = c->fc->streams[c->fc->nb_streams-1];
ac3info = get_be24(pb);
acmod = (ac3info >> 11) & 0x7;
lfeon = (ac3info >> 10) & 0x1;
st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
return 0;
}
static int mov_read_pasp(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
{
const int num = get_be32(pb);
@ -2245,6 +2260,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
{ MKTAG('u','d','t','a'), mov_read_default },
{ MKTAG('w','a','v','e'), mov_read_wave },
{ MKTAG('e','s','d','s'), mov_read_esds },
{ MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
{ MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
{ MKTAG('c','m','o','v'), mov_read_cmov },
{ 0, NULL }