/* * 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