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more error checks for the sequence header 

Originally committed as revision 2788 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-16 03:34:11 +00:00
parent 69dde1ad36
commit e6dc9c6f99
1 changed files with 13 additions and 0 deletions
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13
libavcodec/mpeg12.c
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@ -2373,6 +2373,10 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
if (get_bits1(&s->gb)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
if(v==0){
av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
return -1;
}
j = s->intra_scantable.permutated[i];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
@ -2394,6 +2398,10 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
if (get_bits1(&s->gb)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
if(v==0){
av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
return -1;
}
j = s->intra_scantable.permutated[i];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
@ -2412,6 +2420,11 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
s->chroma_inter_matrix[j] = v;
}
}
if(show_bits(&s->gb, 23) != 0){
av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
return -1;
}
/* we set mpeg2 parameters so that it emulates mpeg1 */
s->progressive_sequence = 1;