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mpegvideo_enc: fix a signed overflow 

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-10-09 20:32:58 +01:00
parent 8b19ae0761
commit 05795f35be
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpegvideo_enc.c
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@ -2023,7 +2023,7 @@ static int mb_var_thread(AVCodecContext *c, void *arg){
int varc;
int sum = s->dsp.pix_sum(pix, s->linesize);
varc = (s->dsp.pix_norm1(pix, s->linesize) - (((unsigned)(sum*sum))>>8) + 500 + 128)>>8;
varc = (s->dsp.pix_norm1(pix, s->linesize) - (((unsigned)sum*sum)>>8) + 500 + 128)>>8;
s->current_picture.mb_var [s->mb_stride * mb_y + mb_x] = varc;
s->current_picture.mb_mean[s->mb_stride * mb_y + mb_x] = (sum+128)>>8;