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Make h264 decoder conform to requirements of mpegvideo's MPV_frame_start.

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Namely, that it should not be called if you are starting to decode a B
frame without any reference pictures.
Prevents an endless allocation cycle in MPV_frame_start that will end in
picture buffer overflow and abort.
Fixes roundup issue 216.

Originally committed as revision 11214 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jeff Downs 2007-12-14 05:37:23 +00:00
parent 603972fc53
commit 33e0073129
1 changed files with 5 additions and 0 deletions
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5
libavcodec/h264.c
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@ -3911,6 +3911,11 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
h->slice_type= slice_type;
s->pict_type= h->slice_type; // to make a few old func happy, it's wrong though
if (s->pict_type == B_TYPE && s->last_picture_ptr == NULL) {
av_log(h->s.avctx, AV_LOG_ERROR,
"B picture before any references, skipping\n");
return -1;
}
pps_id= get_ue_golomb(&s->gb);
if(pps_id>=MAX_PPS_COUNT){