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ituh263dec: Implement enough of Annex O (scalability) to fix a FPE.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-23 10:13:27 +01:00
parent cc415956a4
commit 46c7842994
1 changed files with 14 additions and 0 deletions
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14
libavcodec/ituh263dec.c
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@ -1085,6 +1085,20 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
}
if (s->pict_type!=AV_PICTURE_TYPE_B) {
s->time= s->picture_number;
s->pp_time= s->time - s->last_non_b_time;
s->last_non_b_time= s->time;
}else{
s->time= s->picture_number;
s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
s->pp_time = 2;
s->pb_time = 1;
}
ff_mpeg4_init_direct_mv(s);
}
/* PEI */
while (get_bits1(&s->gb) != 0) {
skip_bits(&s->gb, 8);