ref: 3b14f94924987fc66302bb8b803ad9065816f93e
dir: dav1d/src/cdef_tmpl.c
/*
* Copyright © 2018, VideoLAN and dav1d authors
* Copyright © 2018, Two Orioles, LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <stdlib.h>
#include "common/intops.h"
#include "src/cdef.h"
#include "src/tables.h"
static inline int constrain(const int diff, const int threshold,
const int shift)
{
const int adiff = abs(diff);
return apply_sign(imin(adiff, imax(0, threshold - (adiff >> shift))), diff);
}
static inline void fill(int16_t *tmp, const ptrdiff_t stride,
const int w, const int h)
{
/* Use a value that's a large positive number when interpreted as unsigned,
* and a large negative number when interpreted as signed. */
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++)
tmp[x] = INT16_MIN;
tmp += stride;
}
}
static void padding(int16_t *tmp, const ptrdiff_t tmp_stride,
const pixel *src, const ptrdiff_t src_stride,
const pixel (*left)[2], const pixel *top,
const int w, const int h,
const enum CdefEdgeFlags edges)
{
// fill extended input buffer
int x_start = -2, x_end = w + 2, y_start = -2, y_end = h + 2;
if (!(edges & CDEF_HAVE_TOP)) {
fill(tmp - 2 - 2 * tmp_stride, tmp_stride, w + 4, 2);
y_start = 0;
}
if (!(edges & CDEF_HAVE_BOTTOM)) {
fill(tmp + h * tmp_stride - 2, tmp_stride, w + 4, 2);
y_end -= 2;
}
if (!(edges & CDEF_HAVE_LEFT)) {
fill(tmp + y_start * tmp_stride - 2, tmp_stride, 2, y_end - y_start);
x_start = 0;
}
if (!(edges & CDEF_HAVE_RIGHT)) {
fill(tmp + y_start * tmp_stride + w, tmp_stride, 2, y_end - y_start);
x_end -= 2;
}
for (int y = y_start; y < 0; y++) {
for (int x = x_start; x < x_end; x++)
tmp[x + y * tmp_stride] = top[x];
top += PXSTRIDE(src_stride);
}
for (int y = 0; y < h; y++)
for (int x = x_start; x < 0; x++)
tmp[x + y * tmp_stride] = left[y][2 + x];
for (int y = 0; y < y_end; y++) {
for (int x = (y < h) ? 0 : x_start; x < x_end; x++)
tmp[x] = src[x];
src += PXSTRIDE(src_stride);
tmp += tmp_stride;
}
}
static NOINLINE void
cdef_filter_block_c(pixel *dst, const ptrdiff_t dst_stride,
const pixel (*left)[2], const pixel *const top,
const int pri_strength, const int sec_strength,
const int dir, const int damping, const int w, int h,
const enum CdefEdgeFlags edges HIGHBD_DECL_SUFFIX)
{
const ptrdiff_t tmp_stride = 12;
assert((w == 4 || w == 8) && (h == 4 || h == 8));
int16_t tmp_buf[144]; // 12*12 is the maximum value of tmp_stride * (h + 4)
int16_t *tmp = tmp_buf + 2 * tmp_stride + 2;
padding(tmp, tmp_stride, dst, dst_stride, left, top, w, h, edges);
if (pri_strength) {
const int bitdepth_min_8 = bitdepth_from_max(bitdepth_max) - 8;
const int pri_tap = 4 - ((pri_strength >> bitdepth_min_8) & 1);
const int pri_shift = imax(0, damping - ulog2(pri_strength));
if (sec_strength) {
const int sec_shift = imax(0, damping - ulog2(sec_strength));
do {
for (int x = 0; x < w; x++) {
const int px = dst[x];
int sum = 0;
int max = px, min = px;
int pri_tap_k = pri_tap;
for (int k = 0; k < 2; k++) {
const int off1 = dav1d_cdef_directions[dir + 2][k]; // dir
const int p0 = tmp[x + off1];
const int p1 = tmp[x - off1];
sum += pri_tap_k * constrain(p0 - px, pri_strength, pri_shift);
sum += pri_tap_k * constrain(p1 - px, pri_strength, pri_shift);
// if pri_tap_k == 4 then it becomes 2 else it remains 3
pri_tap_k = (pri_tap_k & 3) | 2;
min = umin(p0, min);
max = imax(p0, max);
min = umin(p1, min);
max = imax(p1, max);
const int off2 = dav1d_cdef_directions[dir + 4][k]; // dir + 2
const int off3 = dav1d_cdef_directions[dir + 0][k]; // dir - 2
const int s0 = tmp[x + off2];
const int s1 = tmp[x - off2];
const int s2 = tmp[x + off3];
const int s3 = tmp[x - off3];
// sec_tap starts at 2 and becomes 1
const int sec_tap = 2 - k;
sum += sec_tap * constrain(s0 - px, sec_strength, sec_shift);
sum += sec_tap * constrain(s1 - px, sec_strength, sec_shift);
sum += sec_tap * constrain(s2 - px, sec_strength, sec_shift);
sum += sec_tap * constrain(s3 - px, sec_strength, sec_shift);
min = umin(s0, min);
max = imax(s0, max);
min = umin(s1, min);
max = imax(s1, max);
min = umin(s2, min);
max = imax(s2, max);
min = umin(s3, min);
max = imax(s3, max);
}
dst[x] = iclip(px + ((sum - (sum < 0) + 8) >> 4), min, max);
}
dst += PXSTRIDE(dst_stride);
tmp += tmp_stride;
} while (--h);
} else { // pri_strength only
do {
for (int x = 0; x < w; x++) {
const int px = dst[x];
int sum = 0;
int pri_tap_k = pri_tap;
for (int k = 0; k < 2; k++) {
const int off = dav1d_cdef_directions[dir + 2][k]; // dir
const int p0 = tmp[x + off];
const int p1 = tmp[x - off];
sum += pri_tap_k * constrain(p0 - px, pri_strength, pri_shift);
sum += pri_tap_k * constrain(p1 - px, pri_strength, pri_shift);
pri_tap_k = (pri_tap_k & 3) | 2;
}
dst[x] = px + ((sum - (sum < 0) + 8) >> 4);
}
dst += PXSTRIDE(dst_stride);
tmp += tmp_stride;
} while (--h);
}
} else { // sec_strength only
assert(sec_strength);
const int sec_shift = imax(0, damping - ulog2(sec_strength));
do {
for (int x = 0; x < w; x++) {
const int px = dst[x];
int sum = 0;
for (int k = 0; k < 2; k++) {
const int off1 = dav1d_cdef_directions[dir + 4][k]; // dir + 2
const int off2 = dav1d_cdef_directions[dir + 0][k]; // dir - 2
const int s0 = tmp[x + off1];
const int s1 = tmp[x - off1];
const int s2 = tmp[x + off2];
const int s3 = tmp[x - off2];
const int sec_tap = 2 - k;
sum += sec_tap * constrain(s0 - px, sec_strength, sec_shift);
sum += sec_tap * constrain(s1 - px, sec_strength, sec_shift);
sum += sec_tap * constrain(s2 - px, sec_strength, sec_shift);
sum += sec_tap * constrain(s3 - px, sec_strength, sec_shift);
}
dst[x] = px + ((sum - (sum < 0) + 8) >> 4);
}
dst += PXSTRIDE(dst_stride);
tmp += tmp_stride;
} while (--h);
}
}
#define cdef_fn(w, h) \
static void cdef_filter_block_##w##x##h##_c(pixel *const dst, \
const ptrdiff_t stride, \
const pixel (*left)[2], \
const pixel *const top, \
const int pri_strength, \
const int sec_strength, \
const int dir, \
const int damping, \
const enum CdefEdgeFlags edges \
HIGHBD_DECL_SUFFIX) \
{ \
cdef_filter_block_c(dst, stride, left, top, pri_strength, sec_strength, \
dir, damping, w, h, edges HIGHBD_TAIL_SUFFIX); \
}
cdef_fn(4, 4);
cdef_fn(4, 8);
cdef_fn(8, 8);
static int cdef_find_dir_c(const pixel *img, const ptrdiff_t stride,
unsigned *const var HIGHBD_DECL_SUFFIX)
{
const int bitdepth_min_8 = bitdepth_from_max(bitdepth_max) - 8;
int partial_sum_hv[2][8] = { { 0 } };
int partial_sum_diag[2][15] = { { 0 } };
int partial_sum_alt[4][11] = { { 0 } };
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 8; x++) {
const int px = (img[x] >> bitdepth_min_8) - 128;
partial_sum_diag[0][ y + x ] += px;
partial_sum_alt [0][ y + (x >> 1)] += px;
partial_sum_hv [0][ y ] += px;
partial_sum_alt [1][3 + y - (x >> 1)] += px;
partial_sum_diag[1][7 + y - x ] += px;
partial_sum_alt [2][3 - (y >> 1) + x ] += px;
partial_sum_hv [1][ x ] += px;
partial_sum_alt [3][ (y >> 1) + x ] += px;
}
img += PXSTRIDE(stride);
}
unsigned cost[8] = { 0 };
for (int n = 0; n < 8; n++) {
cost[2] += partial_sum_hv[0][n] * partial_sum_hv[0][n];
cost[6] += partial_sum_hv[1][n] * partial_sum_hv[1][n];
}
cost[2] *= 105;
cost[6] *= 105;
static const uint16_t div_table[7] = { 840, 420, 280, 210, 168, 140, 120 };
for (int n = 0; n < 7; n++) {
const int d = div_table[n];
cost[0] += (partial_sum_diag[0][n] * partial_sum_diag[0][n] +
partial_sum_diag[0][14 - n] * partial_sum_diag[0][14 - n]) * d;
cost[4] += (partial_sum_diag[1][n] * partial_sum_diag[1][n] +
partial_sum_diag[1][14 - n] * partial_sum_diag[1][14 - n]) * d;
}
cost[0] += partial_sum_diag[0][7] * partial_sum_diag[0][7] * 105;
cost[4] += partial_sum_diag[1][7] * partial_sum_diag[1][7] * 105;
for (int n = 0; n < 4; n++) {
unsigned *const cost_ptr = &cost[n * 2 + 1];
for (int m = 0; m < 5; m++)
*cost_ptr += partial_sum_alt[n][3 + m] * partial_sum_alt[n][3 + m];
*cost_ptr *= 105;
for (int m = 0; m < 3; m++) {
const int d = div_table[2 * m + 1];
*cost_ptr += (partial_sum_alt[n][m] * partial_sum_alt[n][m] +
partial_sum_alt[n][10 - m] * partial_sum_alt[n][10 - m]) * d;
}
}
int best_dir = 0;
unsigned best_cost = cost[0];
for (int n = 1; n < 8; n++) {
if (cost[n] > best_cost) {
best_cost = cost[n];
best_dir = n;
}
}
*var = (best_cost - (cost[best_dir ^ 4])) >> 10;
return best_dir;
}
COLD void bitfn(dav1d_cdef_dsp_init)(Dav1dCdefDSPContext *const c) {
c->dir = cdef_find_dir_c;
c->fb[0] = cdef_filter_block_8x8_c;
c->fb[1] = cdef_filter_block_4x8_c;
c->fb[2] = cdef_filter_block_4x4_c;
#if HAVE_ASM
#if ARCH_AARCH64 || ARCH_ARM
bitfn(dav1d_cdef_dsp_init_arm)(c);
#elif ARCH_PPC64LE
bitfn(dav1d_cdef_dsp_init_ppc)(c);
#elif ARCH_X86
bitfn(dav1d_cdef_dsp_init_x86)(c);
#endif
#endif
}