[FFmpeg-cvslog] vp8: fix signed overflows
Mans Rullgard
git at videolan.org
Sun Oct 9 04:09:35 CEST 2011
ffmpeg | branch: master | Mans Rullgard <mans at mansr.com> | Sat Oct 8 15:03:51 2011 +0100| [bb59156606e00057a706ed30165bc7329db3823f] | committer: Mans Rullgard
vp8: fix signed overflows
In addition to avoiding undefined behaviour, an unsigned type
makes more sense for packing multiple 8-bit values.
Signed-off-by: Mans Rullgard <mans at mansr.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bb59156606e00057a706ed30165bc7329db3823f
---
libavcodec/vp8.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 36c11c2..a8b23f0 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -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;
}
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