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vp8: fix signed overflows

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In addition to avoiding undefined behaviour, an unsigned type
makes more sense for packing multiple 8-bit values.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit bb59156606)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Mans Rullgard 2011-10-08 15:03:51 +01:00 committed by Michael Niedermayer
parent 4ba0e03759
commit f7be632cbd
1 changed files with 3 additions and 2 deletions
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5
libavcodec/vp8.c
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@ -919,7 +919,8 @@ void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
int mb_x, int mb_y)
{
AVCodecContext *avctx = s->avctx;
int x, y, mode, nnz, tr;
int x, y, mode, nnz;
uint32_t tr;
// for the first row, we need to run xchg_mb_border to init the top edge to 127
// otherwise, skip it if we aren't going to deblock
@ -948,7 +949,7 @@ void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
// from the top macroblock
if (!(!mb_y && avctx->flags & CODEC_FLAG_EMU_EDGE) &&
mb_x == s->mb_width-1) {
tr = tr_right[-1]*0x01010101;
tr = tr_right[-1]*0x01010101u;
tr_right = (uint8_t *)&tr;
}