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Enable PB-frames decoding for H.263 

Originally committed as revision 17746 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2009-03-03 05:18:39 +00:00
parent 685502cf3d
commit c978997a88
1 changed files with 9 additions and 4 deletions
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13
libavcodec/h263.c
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@ -5104,10 +5104,7 @@ int h263_decode_picture_header(MpegEncContext *s)
s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
s->unrestricted_mv = s->h263_long_vectors || s->obmc;
if (get_bits1(&s->gb) != 0) {
av_log(s->avctx, AV_LOG_ERROR, "H263 PB frame not supported\n");
return -1; /* not PB frame */
}
s->pb_frame = get_bits1(&s->gb);
s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
@ -5162,6 +5159,7 @@ int h263_decode_picture_header(MpegEncContext *s)
switch(s->pict_type){
case 0: s->pict_type= FF_I_TYPE;break;
case 1: s->pict_type= FF_P_TYPE;break;
case 2: s->pict_type= FF_P_TYPE;s->pb_frame = 3;break;
case 3: s->pict_type= FF_B_TYPE;break;
case 7: s->pict_type= FF_I_TYPE;break; //ZYGO
default:
@ -5251,6 +5249,13 @@ int h263_decode_picture_header(MpegEncContext *s)
s->mb_height = (s->height + 15) / 16;
s->mb_num = s->mb_width * s->mb_height;
if (s->pb_frame) {
skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
if (s->custom_pcf)
skip_bits(&s->gb, 2); //extended Temporal reference
skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
}
/* PEI */
while (get_bits1(&s->gb) != 0) {
skip_bits(&s->gb, 8);