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avidec: detect mpeg4 keyframes in indexless avi 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-05-05 23:54:31 +02:00
parent 0fa8d19987
commit 5e24098b84
1 changed files with 17 additions and 0 deletions
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17
libavformat/avidec.c
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@ -1002,6 +1002,23 @@ resync:
e= &st->index_entries[index];
if(index >= 0 && e->timestamp == ast->frame_offset){
if (index == st->nb_index_entries-1){
int key=1;
int i;
uint32_t state=-1;
for(i=0; i<FFMIN(size,256); i++){
if(st->codec->codec_id == CODEC_ID_MPEG4){
if(state == 0x1B6){
key= !(pkt->data[i]&0xC0);
break;
}
}else
break;
state= (state<<8) + pkt->data[i];
}
if(!key)
e->flags &= ~AVINDEX_KEYFRAME;
}
if (e->flags & AVINDEX_KEYFRAME)
pkt->flags |= AV_PKT_FLAG_KEY;
}