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ffv1enc: Check context_model 

Fixes crash

Found-by: durandal_1707
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-20 00:29:34 +01:00
parent 479fb7b8af
commit e01f478dd2
1 changed files with 4 additions and 0 deletions
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4
libavcodec/ffv1.c
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@ -936,6 +936,10 @@ static av_cold int encode_init(AVCodecContext *avctx)
if (s->transparency) {
av_log(avctx, AV_LOG_WARNING, "Storing alpha plane, this will require a recent FFV1 decoder to playback!\n");
}
if (avctx->context_model > 1U) {
av_log(avctx, AV_LOG_ERROR, "Invalid context model %d, valid values are 0 and 1\n", avctx->context_model);
return AVERROR(EINVAL);
}
for(i=0; i<256; i++){
s->quant_table_count=2;