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Fix VP8 aliasing problems.

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Replace * (uint32_t *) buf accesses with AV_WN32A/AV_COPY32.
This commit is contained in:
Ronald S. Bultje 2011-01-28 09:51:34 -05:00
parent f81c7ac70a
commit 9d4bdcb714
1 changed files with 6 additions and 6 deletions
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12
libavcodec/vp8.c
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@ -1132,9 +1132,9 @@ void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
linesize = 8;
if (!(mb_y + y)) {
copy_dst[3] = 127U;
* (uint32_t *) (copy_dst + 4) = 127U * 0x01010101U;
AV_WN32A(copy_dst+4, 127U * 0x01010101U);
} else {
* (uint32_t *) (copy_dst + 4) = * (uint32_t *) (ptr+4*x-s->linesize);
AV_COPY32(copy_dst+4, ptr+4*x-s->linesize);
if (!(mb_x + x)) {
copy_dst[3] = 129U;
} else {
@ -1158,10 +1158,10 @@ void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
}
s->hpc.pred4x4[mode](dst, topright, linesize);
if (copy) {
* (uint32_t *) (ptr+4*x) = * (uint32_t *) (copy_dst + 12);
* (uint32_t *) (ptr+4*x+s->linesize) = * (uint32_t *) (copy_dst + 20);
* (uint32_t *) (ptr+4*x+s->linesize*2) = * (uint32_t *) (copy_dst + 28);
* (uint32_t *) (ptr+4*x+s->linesize*3) = * (uint32_t *) (copy_dst + 36);
AV_COPY32(ptr+4*x , copy_dst+12);
AV_COPY32(ptr+4*x+s->linesize , copy_dst+20);
AV_COPY32(ptr+4*x+s->linesize*2, copy_dst+28);
AV_COPY32(ptr+4*x+s->linesize*3, copy_dst+36);
}
nnz = s->non_zero_count_cache[y][x];