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/*
* HEVC/VVC SAO template
*
* Copyright (C) 2024 Nuo Mi
* Copyright (C) 2012 - 2013 Guillaume Martres
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
static void FUNC(sao_band_filter)(uint8_t *_dst, const uint8_t *_src,
ptrdiff_t stride_dst, ptrdiff_t stride_src,
const int16_t *sao_offset_val, int sao_left_class,
int width, int height)
{
pixel *dst = (pixel *)_dst;
const pixel *src = (const pixel *)_src;
int offset_table[32] = { 0 };
int k, y, x;
int shift = BIT_DEPTH - 5;
stride_dst /= sizeof(pixel);
stride_src /= sizeof(pixel);
for (k = 0; k < 4; k++)
offset_table[(k + sao_left_class) & 31] = sao_offset_val[k + 1];
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++)
dst[x] = av_clip_pixel(src[x] + offset_table[(src[x] >> shift) & 31]);
dst += stride_dst;
src += stride_src;
}
}
#define CMP(a, b) (((a) > (b)) - ((a) < (b)))
static void FUNC(sao_edge_filter)(uint8_t *_dst, const uint8_t *_src, ptrdiff_t stride_dst, const int16_t *sao_offset_val,
int eo, int width, int height) {
static const uint8_t edge_idx[] = { 1, 2, 0, 3, 4 };
static const int8_t pos[4][2][2] = {
{ { -1, 0 }, { 1, 0 } }, // horizontal
{ { 0, -1 }, { 0, 1 } }, // vertical
{ { -1, -1 }, { 1, 1 } }, // 45 degree
{ { 1, -1 }, { -1, 1 } }, // 135 degree
};
pixel *dst = (pixel *)_dst;
const pixel *src = (const pixel *)_src;
int a_stride, b_stride;
int x, y;
ptrdiff_t stride_src = (2*MAX_PB_SIZE + AV_INPUT_BUFFER_PADDING_SIZE) / sizeof(pixel);
stride_dst /= sizeof(pixel);
a_stride = pos[eo][0][0] + pos[eo][0][1] * stride_src;
b_stride = pos[eo][1][0] + pos[eo][1][1] * stride_src;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
int diff0 = CMP(src[x], src[x + a_stride]);
int diff1 = CMP(src[x], src[x + b_stride]);
int offset_val = edge_idx[2 + diff0 + diff1];
dst[x] = av_clip_pixel(src[x] + sao_offset_val[offset_val]);
}
src += stride_src;
dst += stride_dst;
}
}
static void FUNC(sao_edge_restore_0)(uint8_t *_dst, const uint8_t *_src,
ptrdiff_t stride_dst, ptrdiff_t stride_src, const SAOParams *sao,
const int *borders, int _width, int _height,
int c_idx, const uint8_t *vert_edge,
const uint8_t *horiz_edge, const uint8_t *diag_edge)
{
int x, y;
pixel *dst = (pixel *)_dst;
const pixel *src = (const pixel *)_src;
const int16_t *sao_offset_val = sao->offset_val[c_idx];
int sao_eo_class = sao->eo_class[c_idx];
int init_x = 0, width = _width, height = _height;
stride_dst /= sizeof(pixel);
stride_src /= sizeof(pixel);
if (sao_eo_class != SAO_EO_VERT) {
if (borders[0]) {
int offset_val = sao_offset_val[0];
for (y = 0; y < height; y++) {
dst[y * stride_dst] = av_clip_pixel(src[y * stride_src] + offset_val);
}
init_x = 1;
}
if (borders[2]) {
int offset_val = sao_offset_val[0];
int offset = width - 1;
for (x = 0; x < height; x++) {
dst[x * stride_dst + offset] = av_clip_pixel(src[x * stride_src + offset] + offset_val);
}
width--;
}
}
if (sao_eo_class != SAO_EO_HORIZ) {
if (borders[1]) {
int offset_val = sao_offset_val[0];
for (x = init_x; x < width; x++)
dst[x] = av_clip_pixel(src[x] + offset_val);
}
if (borders[3]) {
int offset_val = sao_offset_val[0];
ptrdiff_t y_stride_dst = stride_dst * (height - 1);
ptrdiff_t y_stride_src = stride_src * (height - 1);
for (x = init_x; x < width; x++)
dst[x + y_stride_dst] = av_clip_pixel(src[x + y_stride_src] + offset_val);
height--;
}
}
}
static void FUNC(sao_edge_restore_1)(uint8_t *_dst, const uint8_t *_src,
ptrdiff_t stride_dst, ptrdiff_t stride_src, const SAOParams *sao,
const int *borders, int _width, int _height,
int c_idx, const uint8_t *vert_edge,
const uint8_t *horiz_edge, const uint8_t *diag_edge)
{
int x, y;
pixel *dst = (pixel *)_dst;
const pixel *src = (const pixel *)_src;
const int16_t *sao_offset_val = sao->offset_val[c_idx];
int sao_eo_class = sao->eo_class[c_idx];
int init_x = 0, init_y = 0, width = _width, height = _height;
stride_dst /= sizeof(pixel);
stride_src /= sizeof(pixel);
if (sao_eo_class != SAO_EO_VERT) {
if (borders[0]) {
int offset_val = sao_offset_val[0];
for (y = 0; y < height; y++) {
dst[y * stride_dst] = av_clip_pixel(src[y * stride_src] + offset_val);
}
init_x = 1;
}
if (borders[2]) {
int offset_val = sao_offset_val[0];
int offset = width - 1;
for (x = 0; x < height; x++) {
dst[x * stride_dst + offset] = av_clip_pixel(src[x * stride_src + offset] + offset_val);
}
width--;
}
}
if (sao_eo_class != SAO_EO_HORIZ) {
if (borders[1]) {
int offset_val = sao_offset_val[0];
for (x = init_x; x < width; x++)
dst[x] = av_clip_pixel(src[x] + offset_val);
init_y = 1;
}
if (borders[3]) {
int offset_val = sao_offset_val[0];
ptrdiff_t y_stride_dst = stride_dst * (height - 1);
ptrdiff_t y_stride_src = stride_src * (height - 1);
for (x = init_x; x < width; x++)
dst[x + y_stride_dst] = av_clip_pixel(src[x + y_stride_src] + offset_val);
height--;
}
}
{
int save_upper_left = !diag_edge[0] && sao_eo_class == SAO_EO_135D && !borders[0] && !borders[1];
int save_upper_right = !diag_edge[1] && sao_eo_class == SAO_EO_45D && !borders[1] && !borders[2];
int save_lower_right = !diag_edge[2] && sao_eo_class == SAO_EO_135D && !borders[2] && !borders[3];
int save_lower_left = !diag_edge[3] && sao_eo_class == SAO_EO_45D && !borders[0] && !borders[3];
// Restore pixels that can't be modified
if(vert_edge[0] && sao_eo_class != SAO_EO_VERT) {
for(y = init_y+save_upper_left; y< height-save_lower_left; y++)
dst[y*stride_dst] = src[y*stride_src];
}
if(vert_edge[1] && sao_eo_class != SAO_EO_VERT) {
for(y = init_y+save_upper_right; y< height-save_lower_right; y++)
dst[y*stride_dst+width-1] = src[y*stride_src+width-1];
}
if(horiz_edge[0] && sao_eo_class != SAO_EO_HORIZ) {
for(x = init_x+save_upper_left; x < width-save_upper_right; x++)
dst[x] = src[x];
}
if(horiz_edge[1] && sao_eo_class != SAO_EO_HORIZ) {
for(x = init_x+save_lower_left; x < width-save_lower_right; x++)
dst[(height-1)*stride_dst+x] = src[(height-1)*stride_src+x];
}
if(diag_edge[0] && sao_eo_class == SAO_EO_135D)
dst[0] = src[0];
if(diag_edge[1] && sao_eo_class == SAO_EO_45D)
dst[width-1] = src[width-1];
if(diag_edge[2] && sao_eo_class == SAO_EO_135D)
dst[stride_dst*(height-1)+width-1] = src[stride_src*(height-1)+width-1];
if(diag_edge[3] && sao_eo_class == SAO_EO_45D)
dst[stride_dst*(height-1)] = src[stride_src*(height-1)];
}
}
#undef CMP
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