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mb stuffing in partitioned frames fix

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Originally committed as revision 2869 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-03-10 23:13:43 +00:00
parent b056e73c80
commit b98202a438
1 changed files with 12 additions and 7 deletions
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19
libavcodec/h263.c
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@ -3336,18 +3336,18 @@ static int mpeg4_decode_partition_a(MpegEncContext *s){
if(s->pict_type==I_TYPE){
int i;
if(show_bits_long(&s->gb, 19)==DC_MARKER){
return mb_num-1;
}
do{
if(show_bits_long(&s->gb, 19)==DC_MARKER){
return mb_num-1;
}
cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
if (cbpc < 0){
av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
}while(cbpc == 8);
s->cbp_table[xy]= cbpc & 3;
s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
s->mb_intra = 1;
@ -3374,7 +3374,7 @@ static int mpeg4_decode_partition_a(MpegEncContext *s){
int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
const int stride= s->block_wrap[0]*2;
// do{ //FIXME
try_again:
bits= show_bits(&s->gb, 17);
if(bits==MOTION_MARKER){
return mb_num-1;
@ -3405,7 +3405,8 @@ static int mpeg4_decode_partition_a(MpegEncContext *s){
av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
// }while(cbpc == 20);
if(cbpc == 20)
goto try_again;
s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
@ -3586,11 +3587,15 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
s->mb_num_left= mb_num;
if(s->pict_type==I_TYPE){
while(show_bits(&s->gb, 9) == 1)
skip_bits(&s->gb, 9);
if(get_bits_long(&s->gb, 19)!=DC_MARKER){
av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
}else{
while(show_bits(&s->gb, 10) == 1)
skip_bits(&s->gb, 10);
if(get_bits(&s->gb, 17)!=MOTION_MARKER){
av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
return -1;