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mpeg4videodec: make sure f/b_code are not invalid values. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-07 16:39:59 +02:00
parent 6560fa390e
commit 6c249392fa
1 changed files with 6 additions and 0 deletions
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6
libavcodec/mpeg4videodec.c
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@ -2073,6 +2073,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
s->f_code = get_bits(gb, 3); /* fcode_for */
if(s->f_code==0){
av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
s->f_code=1;
return -1; // makes no sense to continue, as the MV decoding will break very quickly
}
}else
@ -2080,6 +2081,11 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
if (s->pict_type == AV_PICTURE_TYPE_B) {
s->b_code = get_bits(gb, 3);
if(s->b_code==0){
av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (b_code=0)\n");
s->b_code=1;
return -1; // makes no sense to continue, as the MV decoding will break very quickly
}
}else
s->b_code=1;