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vf_hqdn3d: reduce intermediate precision

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11% faster on penryn, 7% on sandybridge, 5% on bulldozer
Negligible change to output.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Loren Merritt 2012-07-26 22:51:15 +00:00 committed by Ronald S. Bultje
parent 85e228c71d
commit 0f583e6cc5
1 changed files with 32 additions and 30 deletions
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62
libavfilter/vf_hqdn3d.c
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@ -33,32 +33,32 @@
#include "video.h"
typedef struct {
int coefs[4][512*16];
uint32_t *line;
int16_t coefs[4][512*16];
uint16_t *line;
uint16_t *frame_prev[3];
int hsub, vsub;
} HQDN3DContext;
static inline uint32_t lowpass(unsigned int prev, unsigned int cur, int *coef)
static inline uint32_t lowpass(int prev, int cur, int16_t *coef)
{
int dmul = prev-cur;
unsigned int d = (dmul+0x10007FF)>>12; // 0x1000 to convert to unsigned, 7FF for rounding
int d = (prev-cur)>>4;
return cur + coef[d];
}
static void denoise_temporal(uint8_t *src, uint8_t *dst,
uint16_t *frame_ant,
int w, int h, int sstride, int dstride,
int *temporal)
int16_t *temporal)
{
long x, y;
uint32_t tmp;
temporal += 0x1000;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
tmp = lowpass(frame_ant[x]<<8, src[x]<<16, temporal);
frame_ant[x] = (tmp+0x7F)>>8;
dst[x] = (tmp+0x7FFF)>>16;
frame_ant[x] = tmp = lowpass(frame_ant[x], src[x]<<8, temporal);
dst[x] = (tmp+0x7F)>>8;
}
src += sstride;
dst += dstride;
@ -67,47 +67,47 @@ static void denoise_temporal(uint8_t *src, uint8_t *dst,
}
static void denoise_spatial(uint8_t *src, uint8_t *dst,
uint32_t *line_ant, uint16_t *frame_ant,
uint16_t *line_ant, uint16_t *frame_ant,
int w, int h, int sstride, int dstride,
int *spatial, int *temporal)
int16_t *spatial, int16_t *temporal)
{
long x, y;
uint32_t pixel_ant;
uint32_t tmp;
spatial += 0x1000;
temporal += 0x1000;
/* First line has no top neighbor. Only left one for each tmp and
* last frame */
pixel_ant = src[0]<<16;
pixel_ant = src[0]<<8;
for (x = 0; x < w; x++) {
line_ant[x] = tmp = pixel_ant = lowpass(pixel_ant, src[x]<<16, spatial);
tmp = lowpass(frame_ant[x]<<8, tmp, temporal);
frame_ant[x] = (tmp+0x7F)>>8;
dst[x] = (tmp+0x7FFF)>>16;
line_ant[x] = tmp = pixel_ant = lowpass(pixel_ant, src[x]<<8, spatial);
frame_ant[x] = tmp = lowpass(frame_ant[x], tmp, temporal);
dst[x] = (tmp+0x7F)>>8;
}
for (y = 1; y < h; y++) {
src += sstride;
dst += dstride;
frame_ant += w;
pixel_ant = src[0]<<16;
pixel_ant = src[0]<<8;
for (x = 0; x < w-1; x++) {
line_ant[x] = tmp = lowpass(line_ant[x], pixel_ant, spatial);
pixel_ant = lowpass(pixel_ant, src[x+1]<<16, spatial);
tmp = lowpass(frame_ant[x]<<8, tmp, temporal);
frame_ant[x] = (tmp+0x7F)>>8;
dst[x] = (tmp+0x7FFF)>>16;
pixel_ant = lowpass(pixel_ant, src[x+1]<<8, spatial);
frame_ant[x] = tmp = lowpass(frame_ant[x], tmp, temporal);
dst[x] = (tmp+0x7F)>>8;
}
line_ant[x] = tmp = lowpass(line_ant[x], pixel_ant, spatial);
tmp = lowpass(frame_ant[x]<<8, tmp, temporal);
frame_ant[x] = (tmp+0x7F)>>8;
dst[x] = (tmp+0x7FFF)>>16;
frame_ant[x] = tmp = lowpass(frame_ant[x], tmp, temporal);
dst[x] = (tmp+0x7F)>>8;
}
}
static void denoise(uint8_t *src, uint8_t *dst,
uint32_t *line_ant, uint16_t **frame_ant_ptr,
uint16_t *line_ant, uint16_t **frame_ant_ptr,
int w, int h, int sstride, int dstride,
int *spatial, int *temporal)
int16_t *spatial, int16_t *temporal)
{
long x, y;
uint16_t *frame_ant = *frame_ant_ptr;
@ -129,16 +129,18 @@ static void denoise(uint8_t *src, uint8_t *dst,
w, h, sstride, dstride, temporal);
}
static void precalc_coefs(int *ct, double dist25)
static void precalc_coefs(int16_t *ct, double dist25)
{
int i;
double gamma, simil, C;
gamma = log(0.25) / log(1.0 - dist25/255.0 - 0.00001);
gamma = log(0.25) / log(1.0 - FFMIN(dist25,252.0)/255.0 - 0.00001);
for (i = -255*16; i <= 255*16; i++) {
simil = 1.0 - FFABS(i) / (16*255.0);
C = pow(simil, gamma) * 65536.0 * i / 16.0;
// lowpass() truncates (not rounds) the diff, so +15/32 for the midpoint of the bin.
double f = (i + 15.0/32.0) / 16.0;
simil = 1.0 - FFABS(f) / 255.0;
C = pow(simil, gamma) * 256.0 * f;
ct[16*256+i] = lrint(C);
}