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/*
* Copyright (c) 2021, 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 <math.h>
#include "av1/encoder/tune_butteraugli.h"
#include "aom_dsp/butteraugli.h"
#include "aom_ports/system_state.h"
#include "av1/encoder/rdopt.h"
#include "av1/encoder/extend.h"
static const int resize_factor = 2;
void set_mb_butteraugli_rdmult_scaling(AV1_COMP *cpi,
const YV12_BUFFER_CONFIG *source,
const YV12_BUFFER_CONFIG *recon) {
AV1_COMMON *const cm = &cpi->common;
const CommonModeInfoParams *const mi_params = &cm->mi_params;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int width = source->y_crop_width;
const int height = source->y_crop_height;
float *diffmap;
CHECK_MEM_ERROR(cm, diffmap, aom_malloc(width * height * sizeof(*diffmap)));
if (!aom_calc_butteraugli(source, recon, bit_depth, diffmap)) {
aom_internal_error(&cm->error, AOM_CODEC_ERROR,
"Failed to calculate Butteraugli distances.");
}
const int num_mi_w = mi_size_wide[butteraugli_rdo_bsize] / resize_factor;
const int num_mi_h = mi_size_high[butteraugli_rdo_bsize] / resize_factor;
const int num_cols =
(mi_params->mi_cols / resize_factor + num_mi_w - 1) / num_mi_w;
const int num_rows =
(mi_params->mi_rows / resize_factor + num_mi_h - 1) / num_mi_h;
const int block_w = num_mi_w << 2;
const int block_h = num_mi_h << 2;
double log_sum = 0.0;
double blk_count = 0.0;
// Loop through each block.
for (int row = 0; row < num_rows; ++row) {
for (int col = 0; col < num_cols; ++col) {
const int index = row * num_cols + col;
const int y_start = row * block_h;
const int x_start = col * block_w;
float dbutteraugli = 0.0f;
float dmse = 0.0f;
// Loop through each pixel.
for (int y = y_start; y < y_start + block_h && y < height; y++) {
for (int x = x_start; x < x_start + block_w && x < width; x++) {
dbutteraugli += powf(diffmap[y * width + x], 12.0f);
float px_diff = source->y_buffer[y * source->y_stride + x] -
recon->y_buffer[y * recon->y_stride + x];
dmse += px_diff * px_diff;
}
}
for (int y = y_start; y < y_start + block_h && y < height; y += 2) {
for (int x = x_start; x < x_start + block_w && x < width; x += 2) {
const int src_px_index = y / 2 * source->uv_stride + x / 2;
const int recon_px_index = y / 2 * recon->uv_stride + x / 2;
const float px_diff_u = (float)(source->u_buffer[src_px_index] -
recon->u_buffer[recon_px_index]);
const float px_diff_v = (float)(source->v_buffer[src_px_index] -
recon->v_buffer[recon_px_index]);
dmse += px_diff_u * px_diff_u + px_diff_v * px_diff_v;
}
}
dbutteraugli = powf(dbutteraugli, 1.0f / 12.0f);
dmse = dmse / (2.0f * (float)block_w * (float)block_h);
// 'K' is used to balance the rate-distortion distribution between PSNR
// and Butteraugli.
const double K = 0.4;
const float eps = 0.01f;
double weight;
if (dbutteraugli < eps || dmse < eps) {
weight = -1.0;
} else {
blk_count += 1.0;
weight = dmse / dbutteraugli;
weight = AOMMIN(weight, 5.0);
weight += K;
log_sum += log(weight);
}
cpi->butteraugli_info.rdmult_scaling_factors[index] = weight;
}
}
// Geometric average of the weights.
log_sum = exp(log_sum / blk_count);
for (int row = 0; row < num_rows; ++row) {
for (int col = 0; col < num_cols; ++col) {
const int index = row * num_cols + col;
double *weight = &cpi->butteraugli_info.rdmult_scaling_factors[index];
if (*weight <= 0.0) {
*weight = 1.0;
} else {
*weight /= log_sum;
}
*weight = AOMMIN(*weight, 2.5);
*weight = AOMMAX(*weight, 0.4);
}
}
aom_free(diffmap);
}
void av1_set_butteraugli_rdmult(const AV1_COMP *cpi, MACROBLOCK *x,
BLOCK_SIZE bsize, int mi_row, int mi_col,
int *rdmult) {
assert(cpi->oxcf.tune_cfg.tuning == AOM_TUNE_BUTTERAUGLI);
if (!cpi->butteraugli_info.recon_set) {
return;
}
const AV1_COMMON *const cm = &cpi->common;
const int num_mi_w = mi_size_wide[butteraugli_rdo_bsize];
const int num_mi_h = mi_size_high[butteraugli_rdo_bsize];
const int num_cols = (cm->mi_params.mi_cols + num_mi_w - 1) / num_mi_w;
const int num_rows = (cm->mi_params.mi_rows + num_mi_h - 1) / num_mi_h;
const int num_bcols = (mi_size_wide[bsize] + num_mi_w - 1) / num_mi_w;
const int num_brows = (mi_size_high[bsize] + num_mi_h - 1) / num_mi_h;
double num_of_mi = 0.0;
double geom_mean_of_scale = 0.0;
aom_clear_system_state();
for (int row = mi_row / num_mi_w;
row < num_rows && row < mi_row / num_mi_w + num_brows; ++row) {
for (int col = mi_col / num_mi_h;
col < num_cols && col < mi_col / num_mi_h + num_bcols; ++col) {
const int index = row * num_cols + col;
geom_mean_of_scale +=
log(cpi->butteraugli_info.rdmult_scaling_factors[index]);
num_of_mi += 1.0;
}
}
geom_mean_of_scale = exp(geom_mean_of_scale / num_of_mi);
*rdmult = (int)((double)(*rdmult) * geom_mean_of_scale + 0.5);
*rdmult = AOMMAX(*rdmult, 0);
av1_set_error_per_bit(&x->errorperbit, *rdmult);
aom_clear_system_state();
}
static void copy_plane(const uint8_t *src, int src_stride, uint8_t *dst,
int dst_stride, int w, int h) {
for (int row = 0; row < h; row++) {
memcpy(dst, src, w);
src += src_stride;
dst += dst_stride;
}
}
static void copy_img(const YV12_BUFFER_CONFIG *src, YV12_BUFFER_CONFIG *dst,
int width, int height) {
copy_plane(src->y_buffer, src->y_stride, dst->y_buffer, dst->y_stride, width,
height);
copy_plane(src->u_buffer, src->uv_stride, dst->u_buffer, dst->uv_stride,
width / 2, height / 2);
copy_plane(src->v_buffer, src->uv_stride, dst->v_buffer, dst->uv_stride,
width / 2, height / 2);
}
static void zero_plane(uint8_t *dst, int dst_stride, int h) {
for (int row = 0; row < h; row++) {
memset(dst, 0, dst_stride);
dst += dst_stride;
}
}
static void zero_img(YV12_BUFFER_CONFIG *dst) {
zero_plane(dst->y_buffer, dst->y_stride, dst->y_height);
zero_plane(dst->u_buffer, dst->uv_stride, dst->uv_height);
zero_plane(dst->v_buffer, dst->uv_stride, dst->uv_height);
}
void av1_setup_butteraugli_source(AV1_COMP *cpi) {
aom_clear_system_state();
YV12_BUFFER_CONFIG *const dst = &cpi->butteraugli_info.source;
AV1_COMMON *const cm = &cpi->common;
const int width = cpi->source->y_crop_width;
const int height = cpi->source->y_crop_height;
const int bit_depth = cpi->td.mb.e_mbd.bd;
if (dst->buffer_alloc_sz == 0) {
aom_alloc_frame_buffer(
dst, width, height, 1, 1, cm->seq_params.use_highbitdepth,
cpi->oxcf.border_in_pixels, cm->features.byte_alignment);
}
av1_copy_and_extend_frame(cpi->source, dst);
YV12_BUFFER_CONFIG *const resized_dst = &cpi->butteraugli_info.resized_source;
if (resized_dst->buffer_alloc_sz == 0) {
aom_alloc_frame_buffer(
resized_dst, width / resize_factor, height / resize_factor, 1, 1,
cm->seq_params.use_highbitdepth, cpi->oxcf.border_in_pixels,
cm->features.byte_alignment);
}
av1_resize_and_extend_frame_nonnormative(cpi->source, resized_dst, bit_depth,
av1_num_planes(cm));
zero_img(cpi->source);
copy_img(resized_dst, cpi->source, width / resize_factor,
height / resize_factor);
aom_clear_system_state();
}
void av1_restore_butteraugli_source(AV1_COMP *cpi) {
aom_clear_system_state();
av1_copy_and_extend_frame(&cpi->butteraugli_info.source, cpi->source);
AV1_COMMON *const cm = &cpi->common;
const int width = cpi->source->y_crop_width;
const int height = cpi->source->y_crop_height;
YV12_BUFFER_CONFIG resized_recon;
memset(&resized_recon, 0, sizeof(resized_recon));
aom_alloc_frame_buffer(
&resized_recon, width / resize_factor, height / resize_factor, 1, 1,
cm->seq_params.use_highbitdepth, cpi->oxcf.border_in_pixels,
cm->features.byte_alignment);
copy_img(&cpi->common.cur_frame->buf, &resized_recon, width / resize_factor,
height / resize_factor);
set_mb_butteraugli_rdmult_scaling(cpi, &cpi->butteraugli_info.resized_source,
&resized_recon);
cpi->butteraugli_info.recon_set = true;
aom_free_frame_buffer(&resized_recon);
aom_clear_system_state();
}
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