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Make h264 decoder conform to requirements of mpegvideo's MPV_frame_start.
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
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@ -3911,6 +3911,11 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
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h->slice_type= slice_type;
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s->pict_type= h->slice_type; // to make a few old func happy, it's wrong though
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if (s->pict_type == B_TYPE && s->last_picture_ptr == NULL) {
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av_log(h->s.avctx, AV_LOG_ERROR,
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"B picture before any references, skipping\n");
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return -1;
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}
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pps_id= get_ue_golomb(&s->gb);
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if(pps_id>=MAX_PPS_COUNT){
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