| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| #include <assert.h> |
| #include "av1/common/clpf.h" |
| #include "./aom_dsp_rtcd.h" |
| #include "aom_dsp/aom_dsp_common.h" |
| |
| int av1_clpf_maxbits(const AV1_COMMON *cm) { |
| return get_msb( |
| ALIGN_POWER_OF_TWO(cm->mi_cols * MI_SIZE, cm->clpf_size + 4) * |
| ALIGN_POWER_OF_TWO(cm->mi_rows * MI_SIZE, cm->clpf_size + 4) >> |
| (cm->clpf_size * 2 + 8)) + |
| 1; |
| } |
| |
| int av1_clpf_sample(int X, int A, int B, int C, int D, int E, int F, int b) { |
| int delta = 4 * clamp(A - X, -b, b) + clamp(B - X, -b, b) + |
| 3 * clamp(C - X, -b, b) + 3 * clamp(D - X, -b, b) + |
| clamp(E - X, -b, b) + 4 * clamp(F - X, -b, b); |
| return (8 + delta - (delta < 0)) >> 4; |
| } |
| |
| void aom_clpf_block_c(const uint8_t *src, uint8_t *dst, int sstride, |
| int dstride, int x0, int y0, int sizex, int sizey, |
| int width, int height, unsigned int strength) { |
| int x, y; |
| for (y = y0; y < y0 + sizey; y++) { |
| for (x = x0; x < x0 + sizex; x++) { |
| int X = src[y * sstride + x]; |
| int A = src[AOMMAX(0, y - 1) * sstride + x]; |
| int B = src[y * sstride + AOMMAX(0, x - 2)]; |
| int C = src[y * sstride + AOMMAX(0, x - 1)]; |
| int D = src[y * sstride + AOMMIN(width - 1, x + 1)]; |
| int E = src[y * sstride + AOMMIN(width - 1, x + 2)]; |
| int F = src[AOMMIN(height - 1, y + 1) * sstride + x]; |
| int delta; |
| delta = av1_clpf_sample(X, A, B, C, D, E, F, strength); |
| dst[y * dstride + x] = X + delta; |
| } |
| } |
| } |
| |
| #if CONFIG_AOM_HIGHBITDEPTH |
| // Identical to aom_clpf_block_c() apart from "src" and "dst". |
| void aom_clpf_block_hbd_c(const uint16_t *src, uint16_t *dst, int sstride, |
| int dstride, int x0, int y0, int sizex, int sizey, |
| int width, int height, unsigned int strength) { |
| int x, y; |
| for (y = y0; y < y0 + sizey; y++) { |
| for (x = x0; x < x0 + sizex; x++) { |
| int X = src[y * sstride + x]; |
| int A = src[AOMMAX(0, y - 1) * sstride + x]; |
| int B = src[y * sstride + AOMMAX(0, x - 2)]; |
| int C = src[y * sstride + AOMMAX(0, x - 1)]; |
| int D = src[y * sstride + AOMMIN(width - 1, x + 1)]; |
| int E = src[y * sstride + AOMMIN(width - 1, x + 2)]; |
| int F = src[AOMMIN(height - 1, y + 1) * sstride + x]; |
| int delta; |
| delta = av1_clpf_sample(X, A, B, C, D, E, F, strength); |
| dst[y * dstride + x] = X + delta; |
| } |
| } |
| } |
| #endif |
| |
| // Return number of filtered blocks |
| int av1_clpf_frame(const YV12_BUFFER_CONFIG *frame, |
| const YV12_BUFFER_CONFIG *org, AV1_COMMON *cm, |
| int enable_fb_flag, unsigned int strength, |
| unsigned int fb_size_log2, uint8_t *blocks, |
| int (*decision)(int, int, const YV12_BUFFER_CONFIG *, |
| const YV12_BUFFER_CONFIG *, |
| const AV1_COMMON *cm, int, int, int, |
| unsigned int, unsigned int, uint8_t *)) { |
| /* Constrained low-pass filter (CLPF) */ |
| int c, k, l, m, n; |
| const int bs = MI_SIZE; |
| const int width = frame->y_crop_width; |
| const int height = frame->y_crop_height; |
| int xpos, ypos; |
| const int sstride = frame->y_stride; |
| int dstride = bs; |
| const int num_fb_hor = (width + (1 << fb_size_log2) - 1) >> fb_size_log2; |
| const int num_fb_ver = (height + (1 << fb_size_log2) - 1) >> fb_size_log2; |
| int block_index = 0; |
| uint8_t *cache = NULL; |
| uint8_t **cache_ptr = NULL; |
| uint8_t **cache_dst = NULL; |
| int cache_idx = 0; |
| const int cache_size = num_fb_hor << (2 * fb_size_log2); |
| const int cache_blocks = cache_size / (bs * bs); |
| YV12_BUFFER_CONFIG dst = *frame; |
| |
| assert(bs == 8); // Optimised code assumes this. |
| |
| #if CONFIG_AOM_HIGHBITDEPTH |
| strength <<= (cm->bit_depth - 8); |
| #endif |
| |
| // Make buffer space for in-place filtering |
| #if CONFIG_AOM_HIGHBITDEPTH |
| CHECK_MEM_ERROR(cm, cache, aom_malloc(cache_size << !!cm->use_highbitdepth)); |
| dst.y_buffer = cm->use_highbitdepth ? CONVERT_TO_BYTEPTR(cache) : cache; |
| #else |
| CHECK_MEM_ERROR(cm, cache, aom_malloc(cache_size)); |
| dst.y_buffer = cache; |
| #endif |
| CHECK_MEM_ERROR(cm, cache_ptr, aom_malloc(cache_blocks * sizeof(*cache_ptr))); |
| CHECK_MEM_ERROR(cm, cache_dst, aom_malloc(cache_blocks * sizeof(*cache_dst))); |
| memset(cache_ptr, 0, cache_blocks * sizeof(*cache_dst)); |
| |
| // Iterate over all filter blocks |
| for (k = 0; k < num_fb_ver; k++) { |
| for (l = 0; l < num_fb_hor; l++) { |
| int h, w; |
| int allskip = 1; |
| const int xoff = l << fb_size_log2; |
| const int yoff = k << fb_size_log2; |
| for (m = 0; allskip && m < (1 << fb_size_log2) / bs; m++) { |
| for (n = 0; allskip && n < (1 << fb_size_log2) / bs; n++) { |
| xpos = xoff + n * bs; |
| ypos = yoff + m * bs; |
| if (xpos < width && ypos < height) { |
| allskip &= |
| cm->mi_grid_visible[ypos / bs * cm->mi_stride + xpos / bs] |
| ->mbmi.skip; |
| } |
| } |
| } |
| |
| // Calculate the actual filter block size near frame edges |
| h = AOMMIN(height, (k + 1) << fb_size_log2) & ((1 << fb_size_log2) - 1); |
| w = AOMMIN(width, (l + 1) << fb_size_log2) & ((1 << fb_size_log2) - 1); |
| h += !h << fb_size_log2; |
| w += !w << fb_size_log2; |
| if (!allskip && // Do not filter the block if all is skip encoded |
| (!enable_fb_flag || |
| decision(k, l, frame, org, cm, bs, w / bs, h / bs, strength, |
| fb_size_log2, blocks + block_index))) { |
| // Iterate over all smaller blocks inside the filter block |
| for (m = 0; m < (h + bs - 1) / bs; m++) { |
| for (n = 0; n < (w + bs - 1) / bs; n++) { |
| xpos = xoff + n * bs; |
| ypos = yoff + m * bs; |
| if (!cm->mi_grid_visible[ypos / bs * cm->mi_stride + xpos / bs] |
| ->mbmi.skip) { // Not skip block |
| // Temporary buffering needed if filtering in-place |
| if (cache_ptr[cache_idx]) { |
| // Copy filtered block back into the frame |
| #if CONFIG_AOM_HIGHBITDEPTH |
| if (cm->use_highbitdepth) { |
| uint16_t *const d = CONVERT_TO_SHORTPTR(cache_dst[cache_idx]); |
| for (c = 0; c < bs; c++) { |
| *(uint64_t *)(d + c * sstride) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs * 2); |
| *(uint64_t *)(d + c * sstride + 4) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs * 2 + 8); |
| } |
| } else { |
| for (c = 0; c < bs; c++) |
| *(uint64_t *)(cache_dst[cache_idx] + c * sstride) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs); |
| } |
| #else |
| for (c = 0; c < bs; c++) |
| *(uint64_t *)(cache_dst[cache_idx] + c * sstride) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs); |
| #endif |
| } |
| #if CONFIG_AOM_HIGHBITDEPTH |
| if (cm->use_highbitdepth) { |
| cache_ptr[cache_idx] = cache + cache_idx * bs * bs * 2; |
| dst.y_buffer = |
| CONVERT_TO_BYTEPTR(cache_ptr[cache_idx]) - ypos * bs - xpos; |
| } else { |
| cache_ptr[cache_idx] = cache + cache_idx * bs * bs; |
| dst.y_buffer = cache_ptr[cache_idx] - ypos * bs - xpos; |
| } |
| #else |
| cache_ptr[cache_idx] = cache + cache_idx * bs * bs; |
| dst.y_buffer = cache_ptr[cache_idx] - ypos * bs - xpos; |
| #endif |
| cache_dst[cache_idx] = frame->y_buffer + ypos * sstride + xpos; |
| if (++cache_idx >= cache_blocks) cache_idx = 0; |
| |
| // Apply the filter |
| #if CONFIG_AOM_HIGHBITDEPTH |
| if (cm->use_highbitdepth) { |
| aom_clpf_block_hbd(CONVERT_TO_SHORTPTR(frame->y_buffer), |
| CONVERT_TO_SHORTPTR(dst.y_buffer), sstride, |
| dstride, xpos, ypos, bs, bs, width, height, |
| strength); |
| } else { |
| aom_clpf_block(frame->y_buffer, dst.y_buffer, sstride, dstride, |
| xpos, ypos, bs, bs, width, height, strength); |
| } |
| #else |
| aom_clpf_block(frame->y_buffer, dst.y_buffer, sstride, dstride, |
| xpos, ypos, bs, bs, width, height, strength); |
| #endif |
| } |
| } |
| } |
| } |
| block_index += !allskip; // Count number of blocks filtered |
| } |
| } |
| |
| // Copy remaining blocks into the frame |
| for (cache_idx = 0; cache_idx < cache_blocks && cache_ptr[cache_idx]; |
| cache_idx++) { |
| #if CONFIG_AOM_HIGHBITDEPTH |
| if (cm->use_highbitdepth) { |
| uint16_t *const d = CONVERT_TO_SHORTPTR(cache_dst[cache_idx]); |
| for (c = 0; c < bs; c++) { |
| *(uint64_t *)(d + c * sstride) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs * 2); |
| *(uint64_t *)(d + c * sstride + 4) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs * 2 + 8); |
| } |
| } else { |
| for (c = 0; c < bs; c++) |
| *(uint64_t *)(cache_dst[cache_idx] + c * sstride) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs); |
| } |
| #else |
| for (c = 0; c < bs; c++) |
| *(uint64_t *)(cache_dst[cache_idx] + c * sstride) = |
| *(uint64_t *)(cache_ptr[cache_idx] + c * bs); |
| #endif |
| } |
| |
| aom_free(cache); |
| aom_free(cache_ptr); |
| aom_free(cache_dst); |
| |
| return block_index; |
| } |
