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authorKostya Shishkov <kostya.shishkov@gmail.com>2008-01-19 11:04:02 +0000
committerKostya Shishkov <kostya.shishkov@gmail.com>2008-01-19 11:04:02 +0000
commitd1cc6e46f2abd7770c0eb107a6baf3c140406cbf (patch)
tree389eca53dd05d8cff95f0e70d549a6507e7fb7e9 /libavcodec/vc1dsp.c
parentf3647f59f19512296c34efef5a99242a521bd986 (diff)
downloadffmpeg-d1cc6e46f2abd7770c0eb107a6baf3c140406cbf.tar.gz
simplify 4-point transform part a bit
Originally committed as revision 11559 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vc1dsp.c')
-rw-r--r--libavcodec/vc1dsp.c60
1 files changed, 26 insertions, 34 deletions
diff --git a/libavcodec/vc1dsp.c b/libavcodec/vc1dsp.c
index 641dd356e3..8a1a83411f 100644
--- a/libavcodec/vc1dsp.c
+++ b/libavcodec/vc1dsp.c
@@ -194,15 +194,13 @@ static void vc1_inv_trans_8x4_c(uint8_t *dest, int linesize, DCTELEM *block)
for(i = 0; i < 8; i++){
t1 = 17 * (src[ 0] + src[16]) + 64;
t2 = 17 * (src[ 0] - src[16]) + 64;
- t3 = 22 * src[ 8];
- t4 = 22 * src[24];
- t5 = 10 * src[ 8];
- t6 = 10 * src[24];
+ t3 = 22 * src[ 8] + 10 * src[24];
+ t4 = 22 * src[24] - 10 * src[ 8];
- dest[0*linesize] = cm[dest[0*linesize] + ((t1 + t3 + t6) >> 7)];
- dest[1*linesize] = cm[dest[1*linesize] + ((t2 - t4 + t5) >> 7)];
- dest[2*linesize] = cm[dest[2*linesize] + ((t2 + t4 - t5) >> 7)];
- dest[3*linesize] = cm[dest[3*linesize] + ((t1 - t3 - t6) >> 7)];
+ dest[0*linesize] = cm[dest[0*linesize] + ((t1 + t3) >> 7)];
+ dest[1*linesize] = cm[dest[1*linesize] + ((t2 - t4) >> 7)];
+ dest[2*linesize] = cm[dest[2*linesize] + ((t2 + t4) >> 7)];
+ dest[3*linesize] = cm[dest[3*linesize] + ((t1 - t3) >> 7)];
src ++;
dest++;
@@ -223,15 +221,13 @@ static void vc1_inv_trans_4x8_c(uint8_t *dest, int linesize, DCTELEM *block)
for(i = 0; i < 8; i++){
t1 = 17 * (src[0] + src[2]) + 4;
t2 = 17 * (src[0] - src[2]) + 4;
- t3 = 22 * src[1];
- t4 = 22 * src[3];
- t5 = 10 * src[1];
- t6 = 10 * src[3];
+ t3 = 22 * src[1] + 10 * src[3];
+ t4 = 22 * src[3] - 10 * src[1];
- dst[0] = (t1 + t3 + t6) >> 3;
- dst[1] = (t2 - t4 + t5) >> 3;
- dst[2] = (t2 + t4 - t5) >> 3;
- dst[3] = (t1 - t3 - t6) >> 3;
+ dst[0] = (t1 + t3) >> 3;
+ dst[1] = (t2 - t4) >> 3;
+ dst[2] = (t2 + t4) >> 3;
+ dst[3] = (t1 - t3) >> 3;
src += 8;
dst += 8;
@@ -273,7 +269,7 @@ static void vc1_inv_trans_4x8_c(uint8_t *dest, int linesize, DCTELEM *block)
static void vc1_inv_trans_4x4_c(uint8_t *dest, int linesize, DCTELEM *block)
{
int i;
- register int t1,t2,t3,t4,t5,t6;
+ register int t1,t2,t3,t4;
DCTELEM *src, *dst;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
@@ -282,15 +278,13 @@ static void vc1_inv_trans_4x4_c(uint8_t *dest, int linesize, DCTELEM *block)
for(i = 0; i < 4; i++){
t1 = 17 * (src[0] + src[2]) + 4;
t2 = 17 * (src[0] - src[2]) + 4;
- t3 = 22 * src[1];
- t4 = 22 * src[3];
- t5 = 10 * src[1];
- t6 = 10 * src[3];
+ t3 = 22 * src[1] + 10 * src[3];
+ t4 = 22 * src[3] - 10 * src[1];
- dst[0] = (t1 + t3 + t6) >> 3;
- dst[1] = (t2 - t4 + t5) >> 3;
- dst[2] = (t2 + t4 - t5) >> 3;
- dst[3] = (t1 - t3 - t6) >> 3;
+ dst[0] = (t1 + t3) >> 3;
+ dst[1] = (t2 - t4) >> 3;
+ dst[2] = (t2 + t4) >> 3;
+ dst[3] = (t1 - t3) >> 3;
src += 8;
dst += 8;
@@ -300,15 +294,13 @@ static void vc1_inv_trans_4x4_c(uint8_t *dest, int linesize, DCTELEM *block)
for(i = 0; i < 4; i++){
t1 = 17 * (src[ 0] + src[16]) + 64;
t2 = 17 * (src[ 0] - src[16]) + 64;
- t3 = 22 * src[ 8];
- t4 = 22 * src[24];
- t5 = 10 * src[ 8];
- t6 = 10 * src[24];
-
- dest[0*linesize] = cm[dest[0*linesize] + ((t1 + t3 + t6) >> 7)];
- dest[1*linesize] = cm[dest[1*linesize] + ((t2 - t4 + t5) >> 7)];
- dest[2*linesize] = cm[dest[2*linesize] + ((t2 + t4 - t5) >> 7)];
- dest[3*linesize] = cm[dest[3*linesize] + ((t1 - t3 - t6) >> 7)];
+ t3 = 22 * src[ 8] + 10 * src[24];
+ t4 = 22 * src[24] - 10 * src[ 8];
+
+ dest[0*linesize] = cm[dest[0*linesize] + ((t1 + t3) >> 7)];
+ dest[1*linesize] = cm[dest[1*linesize] + ((t2 - t4) >> 7)];
+ dest[2*linesize] = cm[dest[2*linesize] + ((t2 + t4) >> 7)];
+ dest[3*linesize] = cm[dest[3*linesize] + ((t1 - t3) >> 7)];
src ++;
dest++;