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Make sure spatial_decomposition_count is not too large for picture size.

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this led to an infinite loop in mirror().

Originally committed as revision 18396 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-04-09 20:23:13 +00:00
parent 69409ccb80
commit eebbb33abf
1 changed files with 5 additions and 0 deletions
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5
libavcodec/snow.c
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@ -3625,6 +3625,11 @@ static int decode_header(SnowContext *s){
av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported", s->spatial_decomposition_type);
return -1;
}
if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 0){
av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size", s->spatial_decomposition_count);
return -1;
}
s->qlog += get_symbol(&s->c, s->header_state, 1);
s->mv_scale += get_symbol(&s->c, s->header_state, 1);