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-rw-r--r--libavcodec/svq3.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c
index f95d39fc38..c9d4160a1a 100644
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@@ -281,16 +281,16 @@ static void svq3_add_idct_c(uint8_t *dst, int16_t *block,
}
for (i = 0; i < 4; i++) {
- const int z0 = 13 * (block[i + 4 * 0] + block[i + 4 * 2]);
- const int z1 = 13 * (block[i + 4 * 0] - block[i + 4 * 2]);
- const int z2 = 7 * block[i + 4 * 1] - 17 * block[i + 4 * 3];
- const int z3 = 17 * block[i + 4 * 1] + 7 * block[i + 4 * 3];
+ const unsigned z0 = 13 * (block[i + 4 * 0] + block[i + 4 * 2]);
+ const unsigned z1 = 13 * (block[i + 4 * 0] - block[i + 4 * 2]);
+ const unsigned z2 = 7 * block[i + 4 * 1] - 17 * block[i + 4 * 3];
+ const unsigned z3 = 17 * block[i + 4 * 1] + 7 * block[i + 4 * 3];
const int rr = (dc + 0x80000);
- dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((z0 + z3) * qmul + rr >> 20));
- dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((z1 + z2) * qmul + rr >> 20));
- dst[i + stride * 2] = av_clip_uint8(dst[i + stride * 2] + ((z1 - z2) * qmul + rr >> 20));
- dst[i + stride * 3] = av_clip_uint8(dst[i + stride * 3] + ((z0 - z3) * qmul + rr >> 20));
+ dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((int)((z0 + z3) * qmul + rr) >> 20));
+ dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((int)((z1 + z2) * qmul + rr) >> 20));
+ dst[i + stride * 2] = av_clip_uint8(dst[i + stride * 2] + ((int)((z1 - z2) * qmul + rr) >> 20));
+ dst[i + stride * 3] = av_clip_uint8(dst[i + stride * 3] + ((int)((z0 - z3) * qmul + rr) >> 20));
}
memset(block, 0, 16 * sizeof(int16_t));