ref: a6bc3dfb0f8e46017d7823985f8383a8dc6cc68b
dir: /vpx_dsp/variance.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "./vpx_config.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx_ports/mem.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/variance.h"
static const uint8_t bilinear_filters[8][2] = {
{ 128, 0 }, { 112, 16 }, { 96, 32 }, { 80, 48 },
{ 64, 64 }, { 48, 80 }, { 32, 96 }, { 16, 112 },
};
uint32_t vpx_get4x4sse_cs_c(const uint8_t *a, int a_stride, const uint8_t *b,
int b_stride) {
int distortion = 0;
int r, c;
for (r = 0; r < 4; ++r) {
for (c = 0; c < 4; ++c) {
int diff = a[c] - b[c];
distortion += diff * diff;
}
a += a_stride;
b += b_stride;
}
return distortion;
}
uint32_t vpx_get_mb_ss_c(const int16_t *a) {
unsigned int i, sum = 0;
for (i = 0; i < 256; ++i) {
sum += a[i] * a[i];
}
return sum;
}
static void variance(const uint8_t *a, int a_stride, const uint8_t *b,
int b_stride, int w, int h, uint32_t *sse, int *sum) {
int i, j;
*sum = 0;
*sse = 0;
for (i = 0; i < h; ++i) {
for (j = 0; j < w; ++j) {
const int diff = a[j] - b[j];
*sum += diff;
*sse += diff * diff;
}
a += a_stride;
b += b_stride;
}
}
// Applies a 1-D 2-tap bilinear filter to the source block in either horizontal
// or vertical direction to produce the filtered output block. Used to implement
// the first-pass of 2-D separable filter.
//
// Produces int16_t output to retain precision for the next pass. Two filter
// taps should sum to FILTER_WEIGHT. pixel_step defines whether the filter is
// applied horizontally (pixel_step = 1) or vertically (pixel_step = stride).
// It defines the offset required to move from one input to the next.
static void var_filter_block2d_bil_first_pass(const uint8_t *a, uint16_t *b,
unsigned int src_pixels_per_line,
int pixel_step,
unsigned int output_height,
unsigned int output_width,
const uint8_t *filter) {
unsigned int i, j;
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; ++j) {
b[j] = ROUND_POWER_OF_TWO(
(int)a[0] * filter[0] + (int)a[pixel_step] * filter[1], FILTER_BITS);
++a;
}
a += src_pixels_per_line - output_width;
b += output_width;
}
}
// Applies a 1-D 2-tap bilinear filter to the source block in either horizontal
// or vertical direction to produce the filtered output block. Used to implement
// the second-pass of 2-D separable filter.
//
// Requires 16-bit input as produced by filter_block2d_bil_first_pass. Two
// filter taps should sum to FILTER_WEIGHT. pixel_step defines whether the
// filter is applied horizontally (pixel_step = 1) or vertically
// (pixel_step = stride). It defines the offset required to move from one input
// to the next. Output is 8-bit.
static void var_filter_block2d_bil_second_pass(const uint16_t *a, uint8_t *b,
unsigned int src_pixels_per_line,
unsigned int pixel_step,
unsigned int output_height,
unsigned int output_width,
const uint8_t *filter) {
unsigned int i, j;
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; ++j) {
b[j] = ROUND_POWER_OF_TWO(
(int)a[0] * filter[0] + (int)a[pixel_step] * filter[1], FILTER_BITS);
++a;
}
a += src_pixels_per_line - output_width;
b += output_width;
}
}
#define VAR(W, H) \
uint32_t vpx_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride, \
uint32_t *sse) { \
int sum; \
variance(a, a_stride, b, b_stride, W, H, sse, &sum); \
return *sse - (uint32_t)(((int64_t)sum * sum) / (W * H)); \
}
#define SUBPIX_VAR(W, H) \
uint32_t vpx_sub_pixel_variance##W##x##H##_c( \
const uint8_t *a, int a_stride, int xoffset, int yoffset, \
const uint8_t *b, int b_stride, uint32_t *sse) { \
uint16_t fdata3[(H + 1) * W]; \
uint8_t temp2[H * W]; \
\
var_filter_block2d_bil_first_pass(a, fdata3, a_stride, 1, H + 1, W, \
bilinear_filters[xoffset]); \
var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
return vpx_variance##W##x##H##_c(temp2, W, b, b_stride, sse); \
}
#define SUBPIX_AVG_VAR(W, H) \
uint32_t vpx_sub_pixel_avg_variance##W##x##H##_c( \
const uint8_t *a, int a_stride, int xoffset, int yoffset, \
const uint8_t *b, int b_stride, uint32_t *sse, \
const uint8_t *second_pred) { \
uint16_t fdata3[(H + 1) * W]; \
uint8_t temp2[H * W]; \
DECLARE_ALIGNED(16, uint8_t, temp3[H * W]); \
\
var_filter_block2d_bil_first_pass(a, fdata3, a_stride, 1, H + 1, W, \
bilinear_filters[xoffset]); \
var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
vpx_comp_avg_pred(temp3, second_pred, W, H, temp2, W); \
\
return vpx_variance##W##x##H##_c(temp3, W, b, b_stride, sse); \
}
/* Identical to the variance call except it takes an additional parameter, sum,
* and returns that value using pass-by-reference instead of returning
* sse - sum^2 / w*h
*/
#define GET_VAR(W, H) \
void vpx_get##W##x##H##var_c(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride, uint32_t *sse, \
int *sum) { \
variance(a, a_stride, b, b_stride, W, H, sse, sum); \
}
/* Identical to the variance call except it does not calculate the
* sse - sum^2 / w*h and returns sse in addtion to modifying the passed in
* variable.
*/
#define MSE(W, H) \
uint32_t vpx_mse##W##x##H##_c(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride, \
uint32_t *sse) { \
int sum; \
variance(a, a_stride, b, b_stride, W, H, sse, &sum); \
return *sse; \
}
/* All three forms of the variance are available in the same sizes. */
#define VARIANCES(W, H) \
VAR(W, H) \
SUBPIX_VAR(W, H) \
SUBPIX_AVG_VAR(W, H)
VARIANCES(64, 64)
VARIANCES(64, 32)
VARIANCES(32, 64)
VARIANCES(32, 32)
VARIANCES(32, 16)
VARIANCES(16, 32)
VARIANCES(16, 16)
VARIANCES(16, 8)
VARIANCES(8, 16)
VARIANCES(8, 8)
VARIANCES(8, 4)
VARIANCES(4, 8)
VARIANCES(4, 4)
GET_VAR(16, 16)
GET_VAR(8, 8)
MSE(16, 16)
MSE(16, 8)
MSE(8, 16)
MSE(8, 8)
void vpx_comp_avg_pred_c(uint8_t *comp_pred, const uint8_t *pred, int width,
int height, const uint8_t *ref, int ref_stride) {
int i, j;
for (i = 0; i < height; ++i) {
for (j = 0; j < width; ++j) {
const int tmp = pred[j] + ref[j];
comp_pred[j] = ROUND_POWER_OF_TWO(tmp, 1);
}
comp_pred += width;
pred += width;
ref += ref_stride;
}
}
#if CONFIG_VP9_HIGHBITDEPTH
static void highbd_variance64(const uint8_t *a8, int a_stride,
const uint8_t *b8, int b_stride, int w, int h,
uint64_t *sse, int64_t *sum) {
int i, j;
uint16_t *a = CONVERT_TO_SHORTPTR(a8);
uint16_t *b = CONVERT_TO_SHORTPTR(b8);
*sum = 0;
*sse = 0;
for (i = 0; i < h; ++i) {
for (j = 0; j < w; ++j) {
const int diff = a[j] - b[j];
*sum += diff;
*sse += diff * diff;
}
a += a_stride;
b += b_stride;
}
}
static void highbd_8_variance(const uint8_t *a8, int a_stride,
const uint8_t *b8, int b_stride, int w, int h,
uint32_t *sse, int *sum) {
uint64_t sse_long = 0;
int64_t sum_long = 0;
highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
*sse = (uint32_t)sse_long;
*sum = (int)sum_long;
}
static void highbd_10_variance(const uint8_t *a8, int a_stride,
const uint8_t *b8, int b_stride, int w, int h,
uint32_t *sse, int *sum) {
uint64_t sse_long = 0;
int64_t sum_long = 0;
highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
*sse = (uint32_t)ROUND_POWER_OF_TWO(sse_long, 4);
*sum = (int)ROUND_POWER_OF_TWO(sum_long, 2);
}
static void highbd_12_variance(const uint8_t *a8, int a_stride,
const uint8_t *b8, int b_stride, int w, int h,
uint32_t *sse, int *sum) {
uint64_t sse_long = 0;
int64_t sum_long = 0;
highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
*sse = (uint32_t)ROUND_POWER_OF_TWO(sse_long, 8);
*sum = (int)ROUND_POWER_OF_TWO(sum_long, 4);
}
#define HIGHBD_VAR(W, H) \
uint32_t vpx_highbd_8_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride, \
uint32_t *sse) { \
int sum; \
highbd_8_variance(a, a_stride, b, b_stride, W, H, sse, &sum); \
return *sse - (((int64_t)sum * sum) / (W * H)); \
} \
\
uint32_t vpx_highbd_10_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride, \
uint32_t *sse) { \
int sum; \
int64_t var; \
highbd_10_variance(a, a_stride, b, b_stride, W, H, sse, &sum); \
var = (int64_t)(*sse) - (((int64_t)sum * sum) / (W * H)); \
return (var >= 0) ? (uint32_t)var : 0; \
} \
\
uint32_t vpx_highbd_12_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride, \
uint32_t *sse) { \
int sum; \
int64_t var; \
highbd_12_variance(a, a_stride, b, b_stride, W, H, sse, &sum); \
var = (int64_t)(*sse) - (((int64_t)sum * sum) / (W * H)); \
return (var >= 0) ? (uint32_t)var : 0; \
}
#define HIGHBD_GET_VAR(S) \
void vpx_highbd_8_get##S##x##S##var_c(const uint8_t *src, int src_stride, \
const uint8_t *ref, int ref_stride, \
uint32_t *sse, int *sum) { \
highbd_8_variance(src, src_stride, ref, ref_stride, S, S, sse, sum); \
} \
\
void vpx_highbd_10_get##S##x##S##var_c(const uint8_t *src, int src_stride, \
const uint8_t *ref, int ref_stride, \
uint32_t *sse, int *sum) { \
highbd_10_variance(src, src_stride, ref, ref_stride, S, S, sse, sum); \
} \
\
void vpx_highbd_12_get##S##x##S##var_c(const uint8_t *src, int src_stride, \
const uint8_t *ref, int ref_stride, \
uint32_t *sse, int *sum) { \
highbd_12_variance(src, src_stride, ref, ref_stride, S, S, sse, sum); \
}
#define HIGHBD_MSE(W, H) \
uint32_t vpx_highbd_8_mse##W##x##H##_c(const uint8_t *src, int src_stride, \
const uint8_t *ref, int ref_stride, \
uint32_t *sse) { \
int sum; \
highbd_8_variance(src, src_stride, ref, ref_stride, W, H, sse, &sum); \
return *sse; \
} \
\
uint32_t vpx_highbd_10_mse##W##x##H##_c(const uint8_t *src, int src_stride, \
const uint8_t *ref, int ref_stride, \
uint32_t *sse) { \
int sum; \
highbd_10_variance(src, src_stride, ref, ref_stride, W, H, sse, &sum); \
return *sse; \
} \
\
uint32_t vpx_highbd_12_mse##W##x##H##_c(const uint8_t *src, int src_stride, \
const uint8_t *ref, int ref_stride, \
uint32_t *sse) { \
int sum; \
highbd_12_variance(src, src_stride, ref, ref_stride, W, H, sse, &sum); \
return *sse; \
}
static void highbd_var_filter_block2d_bil_first_pass(
const uint8_t *src_ptr8, uint16_t *output_ptr,
unsigned int src_pixels_per_line, int pixel_step,
unsigned int output_height, unsigned int output_width,
const uint8_t *filter) {
unsigned int i, j;
uint16_t *src_ptr = CONVERT_TO_SHORTPTR(src_ptr8);
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; ++j) {
output_ptr[j] = ROUND_POWER_OF_TWO(
(int)src_ptr[0] * filter[0] + (int)src_ptr[pixel_step] * filter[1],
FILTER_BITS);
++src_ptr;
}
// Next row...
src_ptr += src_pixels_per_line - output_width;
output_ptr += output_width;
}
}
static void highbd_var_filter_block2d_bil_second_pass(
const uint16_t *src_ptr, uint16_t *output_ptr,
unsigned int src_pixels_per_line, unsigned int pixel_step,
unsigned int output_height, unsigned int output_width,
const uint8_t *filter) {
unsigned int i, j;
for (i = 0; i < output_height; ++i) {
for (j = 0; j < output_width; ++j) {
output_ptr[j] = ROUND_POWER_OF_TWO(
(int)src_ptr[0] * filter[0] + (int)src_ptr[pixel_step] * filter[1],
FILTER_BITS);
++src_ptr;
}
src_ptr += src_pixels_per_line - output_width;
output_ptr += output_width;
}
}
#define HIGHBD_SUBPIX_VAR(W, H) \
uint32_t vpx_highbd_8_sub_pixel_variance##W##x##H##_c( \
const uint8_t *src, int src_stride, int xoffset, int yoffset, \
const uint8_t *dst, int dst_stride, uint32_t *sse) { \
uint16_t fdata3[(H + 1) * W]; \
uint16_t temp2[H * W]; \
\
highbd_var_filter_block2d_bil_first_pass( \
src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]); \
highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
return vpx_highbd_8_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp2), W, \
dst, dst_stride, sse); \
} \
\
uint32_t vpx_highbd_10_sub_pixel_variance##W##x##H##_c( \
const uint8_t *src, int src_stride, int xoffset, int yoffset, \
const uint8_t *dst, int dst_stride, uint32_t *sse) { \
uint16_t fdata3[(H + 1) * W]; \
uint16_t temp2[H * W]; \
\
highbd_var_filter_block2d_bil_first_pass( \
src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]); \
highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
return vpx_highbd_10_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp2), W, \
dst, dst_stride, sse); \
} \
\
uint32_t vpx_highbd_12_sub_pixel_variance##W##x##H##_c( \
const uint8_t *src, int src_stride, int xoffset, int yoffset, \
const uint8_t *dst, int dst_stride, uint32_t *sse) { \
uint16_t fdata3[(H + 1) * W]; \
uint16_t temp2[H * W]; \
\
highbd_var_filter_block2d_bil_first_pass( \
src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]); \
highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
return vpx_highbd_12_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp2), W, \
dst, dst_stride, sse); \
}
#define HIGHBD_SUBPIX_AVG_VAR(W, H) \
uint32_t vpx_highbd_8_sub_pixel_avg_variance##W##x##H##_c( \
const uint8_t *src, int src_stride, int xoffset, int yoffset, \
const uint8_t *dst, int dst_stride, uint32_t *sse, \
const uint8_t *second_pred) { \
uint16_t fdata3[(H + 1) * W]; \
uint16_t temp2[H * W]; \
DECLARE_ALIGNED(16, uint16_t, temp3[H * W]); \
\
highbd_var_filter_block2d_bil_first_pass( \
src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]); \
highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
vpx_highbd_comp_avg_pred(temp3, second_pred, W, H, \
CONVERT_TO_BYTEPTR(temp2), W); \
\
return vpx_highbd_8_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp3), W, \
dst, dst_stride, sse); \
} \
\
uint32_t vpx_highbd_10_sub_pixel_avg_variance##W##x##H##_c( \
const uint8_t *src, int src_stride, int xoffset, int yoffset, \
const uint8_t *dst, int dst_stride, uint32_t *sse, \
const uint8_t *second_pred) { \
uint16_t fdata3[(H + 1) * W]; \
uint16_t temp2[H * W]; \
DECLARE_ALIGNED(16, uint16_t, temp3[H * W]); \
\
highbd_var_filter_block2d_bil_first_pass( \
src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]); \
highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
vpx_highbd_comp_avg_pred(temp3, second_pred, W, H, \
CONVERT_TO_BYTEPTR(temp2), W); \
\
return vpx_highbd_10_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp3), W, \
dst, dst_stride, sse); \
} \
\
uint32_t vpx_highbd_12_sub_pixel_avg_variance##W##x##H##_c( \
const uint8_t *src, int src_stride, int xoffset, int yoffset, \
const uint8_t *dst, int dst_stride, uint32_t *sse, \
const uint8_t *second_pred) { \
uint16_t fdata3[(H + 1) * W]; \
uint16_t temp2[H * W]; \
DECLARE_ALIGNED(16, uint16_t, temp3[H * W]); \
\
highbd_var_filter_block2d_bil_first_pass( \
src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]); \
highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W, \
bilinear_filters[yoffset]); \
\
vpx_highbd_comp_avg_pred(temp3, second_pred, W, H, \
CONVERT_TO_BYTEPTR(temp2), W); \
\
return vpx_highbd_12_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp3), W, \
dst, dst_stride, sse); \
}
/* All three forms of the variance are available in the same sizes. */
#define HIGHBD_VARIANCES(W, H) \
HIGHBD_VAR(W, H) \
HIGHBD_SUBPIX_VAR(W, H) \
HIGHBD_SUBPIX_AVG_VAR(W, H)
HIGHBD_VARIANCES(64, 64)
HIGHBD_VARIANCES(64, 32)
HIGHBD_VARIANCES(32, 64)
HIGHBD_VARIANCES(32, 32)
HIGHBD_VARIANCES(32, 16)
HIGHBD_VARIANCES(16, 32)
HIGHBD_VARIANCES(16, 16)
HIGHBD_VARIANCES(16, 8)
HIGHBD_VARIANCES(8, 16)
HIGHBD_VARIANCES(8, 8)
HIGHBD_VARIANCES(8, 4)
HIGHBD_VARIANCES(4, 8)
HIGHBD_VARIANCES(4, 4)
HIGHBD_GET_VAR(8)
HIGHBD_GET_VAR(16)
HIGHBD_MSE(16, 16)
HIGHBD_MSE(16, 8)
HIGHBD_MSE(8, 16)
HIGHBD_MSE(8, 8)
void vpx_highbd_comp_avg_pred(uint16_t *comp_pred, const uint8_t *pred8,
int width, int height, const uint8_t *ref8,
int ref_stride) {
int i, j;
uint16_t *pred = CONVERT_TO_SHORTPTR(pred8);
uint16_t *ref = CONVERT_TO_SHORTPTR(ref8);
for (i = 0; i < height; ++i) {
for (j = 0; j < width; ++j) {
const int tmp = pred[j] + ref[j];
comp_pred[j] = ROUND_POWER_OF_TWO(tmp, 1);
}
comp_pred += width;
pred += width;
ref += ref_stride;
}
}
#endif // CONFIG_VP9_HIGHBITDEPTH