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authorRonald S. Bultje <rsbultje@gmail.com>2012-04-13 14:37:47 -0700
committerRonald S. Bultje <rsbultje@gmail.com>2012-04-14 16:29:10 -0700
commit4860625236475da20d0da954017e8c7fe412dea2 (patch)
tree1ea7bbaa942b251c5faac3b59d8fc0e70c81f9ae /libswscale
parent7bf9e3391fa21d90ff283fc03a12287fe73db9e8 (diff)
downloadffmpeg-4860625236475da20d0da954017e8c7fe412dea2.tar.gz
swscale: fix off-by-one in second coefficient in bilinear filters.
If coefficient A is 12-bits xixed-point number "X", then the other coefficient is (1 << 12) - X, not (1 << 12) - X - 1.
Diffstat (limited to 'libswscale')
-rw-r--r--libswscale/output.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/libswscale/output.c b/libswscale/output.c
index 5bc25fc35a..c0f9b367d3 100644
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -353,7 +353,7 @@ yuv2mono_2_c_template(SwsContext *c, const int16_t *buf[2],
{
const int16_t *buf0 = buf[0], *buf1 = buf[1];
const uint8_t * const d128 = dither_8x8_220[y & 7];
- int yalpha1 = 4095 - yalpha;
+ int yalpha1 = 4096 - yalpha;
int i;
for (i = 0; i < dstW; i += 8) {
@@ -505,8 +505,8 @@ yuv2422_2_c_template(SwsContext *c, const int16_t *buf[2],
const int16_t *buf0 = buf[0], *buf1 = buf[1],
*ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
*vbuf0 = vbuf[0], *vbuf1 = vbuf[1];
- int yalpha1 = 4095 - yalpha;
- int uvalpha1 = 4095 - uvalpha;
+ int yalpha1 = 4096 - yalpha;
+ int uvalpha1 = 4096 - uvalpha;
int i;
for (i = 0; i < ((dstW + 1) >> 1); i++) {
@@ -648,8 +648,8 @@ yuv2rgb48_2_c_template(SwsContext *c, const int32_t *buf[2],
const int32_t *buf0 = buf[0], *buf1 = buf[1],
*ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
*vbuf0 = vbuf[0], *vbuf1 = vbuf[1];
- int yalpha1 = 4095 - yalpha;
- int uvalpha1 = 4095 - uvalpha;
+ int yalpha1 = 4096 - yalpha;
+ int uvalpha1 = 4096 - uvalpha;
int i;
for (i = 0; i < ((dstW + 1) >> 1); i++) {
@@ -995,8 +995,8 @@ yuv2rgb_2_c_template(SwsContext *c, const int16_t *buf[2],
*vbuf0 = vbuf[0], *vbuf1 = vbuf[1],
*abuf0 = hasAlpha ? abuf[0] : NULL,
*abuf1 = hasAlpha ? abuf[1] : NULL;
- int yalpha1 = 4095 - yalpha;
- int uvalpha1 = 4095 - uvalpha;
+ int yalpha1 = 4096 - yalpha;
+ int uvalpha1 = 4096 - uvalpha;
int i;
for (i = 0; i < ((dstW + 1) >> 1); i++) {