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avcodec/snow_dwt: Fix left shifts of negative numbers

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Affected the vsynth(1|2|_lena)-snow(|-hpel) tests.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-10-21 16:08:16 +02:00
parent d79c240196
commit c76155236f
1 changed files with 4 additions and 4 deletions
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8
libavcodec/snow_dwt.c
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@ -778,10 +778,10 @@ static inline int w_c(struct MpegEncContext *v, const uint8_t *pix1, const uint8
for (i = 0; i < h; i++) {
for (j = 0; j < w; j += 4) {
tmp[32 * i + j + 0] = (pix1[j + 0] - pix2[j + 0]) << 4;
tmp[32 * i + j + 1] = (pix1[j + 1] - pix2[j + 1]) << 4;
tmp[32 * i + j + 2] = (pix1[j + 2] - pix2[j + 2]) << 4;
tmp[32 * i + j + 3] = (pix1[j + 3] - pix2[j + 3]) << 4;
tmp[32 * i + j + 0] = (pix1[j + 0] - pix2[j + 0]) * (1 << 4);
tmp[32 * i + j + 1] = (pix1[j + 1] - pix2[j + 1]) * (1 << 4);
tmp[32 * i + j + 2] = (pix1[j + 2] - pix2[j + 2]) * (1 << 4);
tmp[32 * i + j + 3] = (pix1[j + 3] - pix2[j + 3]) * (1 << 4);
}
pix1 += line_size;
pix2 += line_size;