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svq1enc: fix signed multiplication overflow

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This multiplication can overflow the signed range but not the
unsigned.  After right-shifting it will thus fit in the signed
range again.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-11-26 16:50:51 +00:00
parent e4faa31a0a
commit f7f892e4d5
1 changed files with 1 additions and 1 deletions
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libavcodec/svq1enc.c
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@ -160,7 +160,7 @@ static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *dec
}
best_count=0;
best_score -= ((block_sum[0]*block_sum[0])>>(level+3));
best_score -= (int)(((unsigned)block_sum[0]*block_sum[0])>>(level+3));
best_mean= (block_sum[0] + (size>>1)) >> (level+3);
if(level<4){