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| author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-10-21 16:08:16 +0200 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-10-24 16:28:14 +0200 |
| commit | c76155236fdfab9eb02ac30d2d03380a0648fb84 (patch) | |
| tree | c9a209e830741d6defb7851a95021d1ba74dfac4 | |
| parent | d79c240196f43b93bd204363f1facc270029f113 (diff) | |
| download | ffmpeg-c76155236fdfab9eb02ac30d2d03380a0648fb84.tar.gz | |
avcodec/snow_dwt: Fix left shifts of negative numbers
Affected the vsynth(1|2|_lena)-snow(|-hpel) tests.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
| -rw-r--r-- | libavcodec/snow_dwt.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavcodec/snow_dwt.c b/libavcodec/snow_dwt.c index 18b315ef66..965f409002 100644 --- a/libavcodec/snow_dwt.c +++ b/libavcodec/snow_dwt.c @@ -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; |