ref: 3ccbd4803bcc75be860dd67bb3a56b114251433b
dir: libvpx/vpx_dsp/deblock.c
/*
* Copyright (c) 2016 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 <assert.h>
#include <stdlib.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
const int16_t vpx_rv[] = {
8, 5, 2, 2, 8, 12, 4, 9, 8, 3, 0, 3, 9, 0, 0, 0, 8, 3, 14,
4, 10, 1, 11, 14, 1, 14, 9, 6, 12, 11, 8, 6, 10, 0, 0, 8, 9, 0,
3, 14, 8, 11, 13, 4, 2, 9, 0, 3, 9, 6, 1, 2, 3, 14, 13, 1, 8,
2, 9, 7, 3, 3, 1, 13, 13, 6, 6, 5, 2, 7, 11, 9, 11, 8, 7, 3,
2, 0, 13, 13, 14, 4, 12, 5, 12, 10, 8, 10, 13, 10, 4, 14, 4, 10, 0,
8, 11, 1, 13, 7, 7, 14, 6, 14, 13, 2, 13, 5, 4, 4, 0, 10, 0, 5,
13, 2, 12, 7, 11, 13, 8, 0, 4, 10, 7, 2, 7, 2, 2, 5, 3, 4, 7,
3, 3, 14, 14, 5, 9, 13, 3, 14, 3, 6, 3, 0, 11, 8, 13, 1, 13, 1,
12, 0, 10, 9, 7, 6, 2, 8, 5, 2, 13, 7, 1, 13, 14, 7, 6, 7, 9,
6, 10, 11, 7, 8, 7, 5, 14, 8, 4, 4, 0, 8, 7, 10, 0, 8, 14, 11,
3, 12, 5, 7, 14, 3, 14, 5, 2, 6, 11, 12, 12, 8, 0, 11, 13, 1, 2,
0, 5, 10, 14, 7, 8, 0, 4, 11, 0, 8, 0, 3, 10, 5, 8, 0, 11, 6,
7, 8, 10, 7, 13, 9, 2, 5, 1, 5, 10, 2, 4, 3, 5, 6, 10, 8, 9,
4, 11, 14, 0, 10, 0, 5, 13, 2, 12, 7, 11, 13, 8, 0, 4, 10, 7, 2,
7, 2, 2, 5, 3, 4, 7, 3, 3, 14, 14, 5, 9, 13, 3, 14, 3, 6, 3,
0, 11, 8, 13, 1, 13, 1, 12, 0, 10, 9, 7, 6, 2, 8, 5, 2, 13, 7,
1, 13, 14, 7, 6, 7, 9, 6, 10, 11, 7, 8, 7, 5, 14, 8, 4, 4, 0,
8, 7, 10, 0, 8, 14, 11, 3, 12, 5, 7, 14, 3, 14, 5, 2, 6, 11, 12,
12, 8, 0, 11, 13, 1, 2, 0, 5, 10, 14, 7, 8, 0, 4, 11, 0, 8, 0,
3, 10, 5, 8, 0, 11, 6, 7, 8, 10, 7, 13, 9, 2, 5, 1, 5, 10, 2,
4, 3, 5, 6, 10, 8, 9, 4, 11, 14, 3, 8, 3, 7, 8, 5, 11, 4, 12,
3, 11, 9, 14, 8, 14, 13, 4, 3, 1, 2, 14, 6, 5, 4, 4, 11, 4, 6,
2, 1, 5, 8, 8, 12, 13, 5, 14, 10, 12, 13, 0, 9, 5, 5, 11, 10, 13,
9, 10, 13,
};
void vpx_post_proc_down_and_across_mb_row_c(unsigned char *src,
unsigned char *dst, int src_pitch,
int dst_pitch, int cols,
unsigned char *flimits, int size) {
unsigned char *p_src, *p_dst;
int row;
int col;
unsigned char v;
unsigned char d[4];
assert(size >= 8);
assert(cols >= 8);
for (row = 0; row < size; row++) {
/* post_proc_down for one row */
p_src = src;
p_dst = dst;
for (col = 0; col < cols; col++) {
unsigned char p_above2 = p_src[col - 2 * src_pitch];
unsigned char p_above1 = p_src[col - src_pitch];
unsigned char p_below1 = p_src[col + src_pitch];
unsigned char p_below2 = p_src[col + 2 * src_pitch];
v = p_src[col];
if ((abs(v - p_above2) < flimits[col]) &&
(abs(v - p_above1) < flimits[col]) &&
(abs(v - p_below1) < flimits[col]) &&
(abs(v - p_below2) < flimits[col])) {
unsigned char k1, k2, k3;
k1 = (p_above2 + p_above1 + 1) >> 1;
k2 = (p_below2 + p_below1 + 1) >> 1;
k3 = (k1 + k2 + 1) >> 1;
v = (k3 + v + 1) >> 1;
}
p_dst[col] = v;
}
/* now post_proc_across */
p_src = dst;
p_dst = dst;
p_src[-2] = p_src[-1] = p_src[0];
p_src[cols] = p_src[cols + 1] = p_src[cols - 1];
for (col = 0; col < cols; col++) {
v = p_src[col];
if ((abs(v - p_src[col - 2]) < flimits[col]) &&
(abs(v - p_src[col - 1]) < flimits[col]) &&
(abs(v - p_src[col + 1]) < flimits[col]) &&
(abs(v - p_src[col + 2]) < flimits[col])) {
unsigned char k1, k2, k3;
k1 = (p_src[col - 2] + p_src[col - 1] + 1) >> 1;
k2 = (p_src[col + 2] + p_src[col + 1] + 1) >> 1;
k3 = (k1 + k2 + 1) >> 1;
v = (k3 + v + 1) >> 1;
}
d[col & 3] = v;
if (col >= 2) p_dst[col - 2] = d[(col - 2) & 3];
}
/* handle the last two pixels */
p_dst[col - 2] = d[(col - 2) & 3];
p_dst[col - 1] = d[(col - 1) & 3];
/* next row */
src += src_pitch;
dst += dst_pitch;
}
}
void vpx_mbpost_proc_across_ip_c(unsigned char *src, int pitch, int rows,
int cols, int flimit) {
int r, c, i;
unsigned char *s = src;
unsigned char d[16];
for (r = 0; r < rows; r++) {
int sumsq = 16;
int sum = 0;
for (i = -8; i < 0; i++) s[i] = s[0];
/* 17 avoids valgrind warning - we buffer values in c in d
* and only write them when we've read 8 ahead...
*/
for (i = 0; i < 17; i++) s[i + cols] = s[cols - 1];
for (i = -8; i <= 6; i++) {
sumsq += s[i] * s[i];
sum += s[i];
d[i + 8] = 0;
}
for (c = 0; c < cols + 8; c++) {
int x = s[c + 7] - s[c - 8];
int y = s[c + 7] + s[c - 8];
sum += x;
sumsq += x * y;
d[c & 15] = s[c];
if (sumsq * 15 - sum * sum < flimit) {
d[c & 15] = (8 + sum + s[c]) >> 4;
}
s[c - 8] = d[(c - 8) & 15];
}
s += pitch;
}
}
void vpx_mbpost_proc_down_c(unsigned char *dst, int pitch, int rows, int cols,
int flimit) {
int r, c, i;
for (c = 0; c < cols; c++) {
unsigned char *s = &dst[c];
int sumsq = 0;
int sum = 0;
unsigned char d[16];
for (i = -8; i < 0; i++) s[i * pitch] = s[0];
/* 17 avoids valgrind warning - we buffer values in c in d
* and only write them when we've read 8 ahead...
*/
for (i = 0; i < 17; i++) s[(i + rows) * pitch] = s[(rows - 1) * pitch];
for (i = -8; i <= 6; i++) {
sumsq += s[i * pitch] * s[i * pitch];
sum += s[i * pitch];
}
for (r = 0; r < rows + 8; r++) {
sumsq += s[7 * pitch] * s[7 * pitch] - s[-8 * pitch] * s[-8 * pitch];
sum += s[7 * pitch] - s[-8 * pitch];
d[r & 15] = s[0];
if (sumsq * 15 - sum * sum < flimit) {
d[r & 15] = (vpx_rv[(r & 127) + (c & 7)] + sum + s[0]) >> 4;
}
if (r >= 8) s[-8 * pitch] = d[(r - 8) & 15];
s += pitch;
}
}
}