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/*
* Copyright (c) 2019, 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 "av1/encoder/tune_vmaf.h"
#include "aom_dsp/psnr.h"
#include "av1/encoder/extend.h"
#include "av1/encoder/rdopt.h"
#include "config/aom_scale_rtcd.h"
static const double kBaselineVmaf = 97.42773;
static double get_layer_value(const double *array, int layer) {
while (array[layer] < 0.0 && layer > 0) layer--;
return AOMMAX(array[layer], 0.0);
}
static void motion_search(AV1_COMP *cpi, const YV12_BUFFER_CONFIG *src,
const YV12_BUFFER_CONFIG *ref,
const BLOCK_SIZE block_size, const int mb_row,
const int mb_col, FULLPEL_MV *ref_mv) {
// Block information (ONLY Y-plane is used for motion search).
const int mb_height = block_size_high[block_size];
const int mb_width = block_size_wide[block_size];
const int y_stride = src->y_stride;
assert(y_stride == ref->y_stride);
const int y_offset = mb_row * mb_height * y_stride + mb_col * mb_width;
// Save input state.
MACROBLOCK *const mb = &cpi->td.mb;
MACROBLOCKD *const mbd = &mb->e_mbd;
const struct buf_2d ori_src_buf = mb->plane[0].src;
const struct buf_2d ori_pre_buf = mbd->plane[0].pre[0];
// Parameters used for motion search.
FULLPEL_MOTION_SEARCH_PARAMS full_ms_params;
FULLPEL_MV_STATS best_mv_stats;
const SEARCH_METHODS search_method = NSTEP;
const search_site_config *search_site_cfg =
cpi->mv_search_params.search_site_cfg[SS_CFG_FPF];
const int step_param =
av1_init_search_range(AOMMAX(src->y_crop_width, src->y_crop_height));
// Baseline position for motion search (used for rate distortion comparison).
const MV baseline_mv = kZeroMv;
// Setup.
mb->plane[0].src.buf = src->y_buffer + y_offset;
mb->plane[0].src.stride = y_stride;
mbd->plane[0].pre[0].buf = ref->y_buffer + y_offset;
mbd->plane[0].pre[0].stride = y_stride;
// Unused intermediate results for motion search.
int cost_list[5];
// Do motion search.
// Only do full search on the entire block.
av1_make_default_fullpel_ms_params(&full_ms_params, cpi, mb, block_size,
&baseline_mv, *ref_mv, search_site_cfg,
search_method,
/*fine_search_interval=*/0);
av1_full_pixel_search(*ref_mv, &full_ms_params, step_param,
cond_cost_list(cpi, cost_list), ref_mv, &best_mv_stats,
NULL);
// Restore input state.
mb->plane[0].src = ori_src_buf;
mbd->plane[0].pre[0] = ori_pre_buf;
}
static unsigned int residual_variance(const AV1_COMP *cpi,
const YV12_BUFFER_CONFIG *src,
const YV12_BUFFER_CONFIG *ref,
const BLOCK_SIZE block_size,
const int mb_row, const int mb_col,
FULLPEL_MV ref_mv, unsigned int *sse) {
const int mb_height = block_size_high[block_size];
const int mb_width = block_size_wide[block_size];
const int y_stride = src->y_stride;
assert(y_stride == ref->y_stride);
const int y_offset = mb_row * mb_height * y_stride + mb_col * mb_width;
const int mv_offset = ref_mv.row * y_stride + ref_mv.col;
const unsigned int var = cpi->ppi->fn_ptr[block_size].vf(
ref->y_buffer + y_offset + mv_offset, y_stride, src->y_buffer + y_offset,
y_stride, sse);
return var;
}
static double frame_average_variance(const AV1_COMP *const cpi,
const YV12_BUFFER_CONFIG *const frame) {
const MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
const uint8_t *const y_buffer = frame->y_buffer;
const int y_stride = frame->y_stride;
const BLOCK_SIZE block_size = BLOCK_64X64;
const int block_w = mi_size_wide[block_size] * 4;
const int block_h = mi_size_high[block_size] * 4;
int row, col;
double var = 0.0, var_count = 0.0;
const int use_hbd = frame->flags & YV12_FLAG_HIGHBITDEPTH;
// Loop through each block.
for (row = 0; row < frame->y_height / block_h; ++row) {
for (col = 0; col < frame->y_width / block_w; ++col) {
struct buf_2d buf;
const int row_offset_y = row * block_h;
const int col_offset_y = col * block_w;
buf.buf = (uint8_t *)y_buffer + row_offset_y * y_stride + col_offset_y;
buf.stride = y_stride;
var += av1_get_perpixel_variance(cpi, xd, &buf, block_size, AOM_PLANE_Y,
use_hbd);
var_count += 1.0;
}
}
var /= var_count;
return var;
}
static double residual_frame_average_variance(AV1_COMP *cpi,
const YV12_BUFFER_CONFIG *src,
const YV12_BUFFER_CONFIG *ref,
FULLPEL_MV *mvs) {
if (ref == NULL) return frame_average_variance(cpi, src);
const BLOCK_SIZE block_size = BLOCK_16X16;
const int frame_height = src->y_height;
const int frame_width = src->y_width;
const int mb_height = block_size_high[block_size];
const int mb_width = block_size_wide[block_size];
const int mb_rows = (frame_height + mb_height - 1) / mb_height;
const int mb_cols = (frame_width + mb_width - 1) / mb_width;
const int num_planes = av1_num_planes(&cpi->common);
const int mi_h = mi_size_high_log2[block_size];
const int mi_w = mi_size_wide_log2[block_size];
assert(num_planes >= 1 && num_planes <= MAX_MB_PLANE);
// Save input state.
MACROBLOCK *const mb = &cpi->td.mb;
MACROBLOCKD *const mbd = &mb->e_mbd;
uint8_t *input_buffer[MAX_MB_PLANE];
for (int i = 0; i < num_planes; i++) {
input_buffer[i] = mbd->plane[i].pre[0].buf;
}
MB_MODE_INFO **input_mb_mode_info = mbd->mi;
bool do_motion_search = false;
if (mvs == NULL) {
do_motion_search = true;
CHECK_MEM_ERROR(&cpi->common, mvs,
(FULLPEL_MV *)aom_calloc(mb_rows * mb_cols, sizeof(*mvs)));
}
unsigned int variance = 0;
// Perform temporal filtering block by block.
for (int mb_row = 0; mb_row < mb_rows; mb_row++) {
av1_set_mv_row_limits(&cpi->common.mi_params, &mb->mv_limits,
(mb_row << mi_h), (mb_height >> MI_SIZE_LOG2),
cpi->oxcf.border_in_pixels);
for (int mb_col = 0; mb_col < mb_cols; mb_col++) {
av1_set_mv_col_limits(&cpi->common.mi_params, &mb->mv_limits,
(mb_col << mi_w), (mb_width >> MI_SIZE_LOG2),
cpi->oxcf.border_in_pixels);
FULLPEL_MV *ref_mv = &mvs[mb_col + mb_row * mb_cols];
if (do_motion_search) {
motion_search(cpi, src, ref, block_size, mb_row, mb_col, ref_mv);
}
unsigned int mv_sse;
const unsigned int blk_var = residual_variance(
cpi, src, ref, block_size, mb_row, mb_col, *ref_mv, &mv_sse);
variance += blk_var;
}
}
// Restore input state
for (int i = 0; i < num_planes; i++) {
mbd->plane[i].pre[0].buf = input_buffer[i];
}
mbd->mi = input_mb_mode_info;
return (double)variance / (double)(mb_rows * mb_cols);
}
// TODO(sdeng): Add the SIMD implementation.
static AOM_INLINE void highbd_unsharp_rect(const uint16_t *source,
int source_stride,
const uint16_t *blurred,
int blurred_stride, uint16_t *dst,
int dst_stride, int w, int h,
double amount, int bit_depth) {
const int max_value = (1 << bit_depth) - 1;
for (int i = 0; i < h; ++i) {
for (int j = 0; j < w; ++j) {
const double val =
(double)source[j] + amount * ((double)source[j] - (double)blurred[j]);
dst[j] = (uint16_t)clamp((int)(val + 0.5), 0, max_value);
}
source += source_stride;
blurred += blurred_stride;
dst += dst_stride;
}
}
static AOM_INLINE void unsharp_rect(const uint8_t *source, int source_stride,
const uint8_t *blurred, int blurred_stride,
uint8_t *dst, int dst_stride, int w, int h,
double amount) {
for (int i = 0; i < h; ++i) {
for (int j = 0; j < w; ++j) {
const double val =
(double)source[j] + amount * ((double)source[j] - (double)blurred[j]);
dst[j] = (uint8_t)clamp((int)(val + 0.5), 0, 255);
}
source += source_stride;
blurred += blurred_stride;
dst += dst_stride;
}
}
static AOM_INLINE void unsharp(const AV1_COMP *const cpi,
const YV12_BUFFER_CONFIG *source,
const YV12_BUFFER_CONFIG *blurred,
const YV12_BUFFER_CONFIG *dst, double amount) {
const int bit_depth = cpi->td.mb.e_mbd.bd;
if (cpi->common.seq_params->use_highbitdepth) {
assert(source->flags & YV12_FLAG_HIGHBITDEPTH);
assert(blurred->flags & YV12_FLAG_HIGHBITDEPTH);
assert(dst->flags & YV12_FLAG_HIGHBITDEPTH);
highbd_unsharp_rect(CONVERT_TO_SHORTPTR(source->y_buffer), source->y_stride,
CONVERT_TO_SHORTPTR(blurred->y_buffer),
blurred->y_stride, CONVERT_TO_SHORTPTR(dst->y_buffer),
dst->y_stride, source->y_width, source->y_height,
amount, bit_depth);
} else {
unsharp_rect(source->y_buffer, source->y_stride, blurred->y_buffer,
blurred->y_stride, dst->y_buffer, dst->y_stride,
source->y_width, source->y_height, amount);
}
}
// 8-tap Gaussian convolution filter with sigma = 1.0, sums to 128,
// all co-efficients must be even.
DECLARE_ALIGNED(16, static const int16_t, gauss_filter[8]) = { 0, 8, 30, 52,
30, 8, 0, 0 };
static AOM_INLINE void gaussian_blur(const int bit_depth,
const YV12_BUFFER_CONFIG *source,
const YV12_BUFFER_CONFIG *dst) {
const int block_size = BLOCK_128X128;
const int block_w = mi_size_wide[block_size] * 4;
const int block_h = mi_size_high[block_size] * 4;
const int num_cols = (source->y_width + block_w - 1) / block_w;
const int num_rows = (source->y_height + block_h - 1) / block_h;
int row, col;
ConvolveParams conv_params = get_conv_params(0, 0, bit_depth);
InterpFilterParams filter = { .filter_ptr = gauss_filter,
.taps = 8,
.interp_filter = EIGHTTAP_REGULAR };
for (row = 0; row < num_rows; ++row) {
for (col = 0; col < num_cols; ++col) {
const int row_offset_y = row * block_h;
const int col_offset_y = col * block_w;
uint8_t *src_buf =
source->y_buffer + row_offset_y * source->y_stride + col_offset_y;
uint8_t *dst_buf =
dst->y_buffer + row_offset_y * dst->y_stride + col_offset_y;
if (source->flags & YV12_FLAG_HIGHBITDEPTH) {
av1_highbd_convolve_2d_sr(
CONVERT_TO_SHORTPTR(src_buf), source->y_stride,
CONVERT_TO_SHORTPTR(dst_buf), dst->y_stride, block_w, block_h,
&filter, &filter, 0, 0, &conv_params, bit_depth);
} else {
av1_convolve_2d_sr(src_buf, source->y_stride, dst_buf, dst->y_stride,
block_w, block_h, &filter, &filter, 0, 0,
&conv_params);
}
}
}
}
static AOM_INLINE double cal_approx_vmaf(
const AV1_COMP *const cpi, double source_variance,
const YV12_BUFFER_CONFIG *const source,
const YV12_BUFFER_CONFIG *const sharpened) {
const int bit_depth = cpi->td.mb.e_mbd.bd;
const bool cal_vmaf_neg =
cpi->oxcf.tune_cfg.tuning == AOM_TUNE_VMAF_NEG_MAX_GAIN;
double new_vmaf;
aom_calc_vmaf(cpi->vmaf_info.vmaf_model, source, sharpened, bit_depth,
cal_vmaf_neg, &new_vmaf);
const double sharpened_var = frame_average_variance(cpi, sharpened);
return source_variance / sharpened_var * (new_vmaf - kBaselineVmaf);
}
static double find_best_frame_unsharp_amount_loop(
const AV1_COMP *const cpi, const YV12_BUFFER_CONFIG *const source,
const YV12_BUFFER_CONFIG *const blurred,
const YV12_BUFFER_CONFIG *const sharpened, double best_vmaf,
const double baseline_variance, const double unsharp_amount_start,
const double step_size, const int max_loop_count, const double max_amount) {
const double min_amount = 0.0;
int loop_count = 0;
double approx_vmaf = best_vmaf;
double unsharp_amount = unsharp_amount_start;
do {
best_vmaf = approx_vmaf;
unsharp_amount += step_size;
if (unsharp_amount > max_amount || unsharp_amount < min_amount) break;
unsharp(cpi, source, blurred, sharpened, unsharp_amount);
approx_vmaf = cal_approx_vmaf(cpi, baseline_variance, source, sharpened);
loop_count++;
} while (approx_vmaf > best_vmaf && loop_count < max_loop_count);
unsharp_amount =
approx_vmaf > best_vmaf ? unsharp_amount : unsharp_amount - step_size;
return AOMMIN(max_amount, AOMMAX(unsharp_amount, min_amount));
}
static double find_best_frame_unsharp_amount(
const AV1_COMP *const cpi, const YV12_BUFFER_CONFIG *const source,
const YV12_BUFFER_CONFIG *const blurred, const double unsharp_amount_start,
const double step_size, const int max_loop_count,
const double max_filter_amount) {
const AV1_COMMON *const cm = &cpi->common;
const int width = source->y_width;
const int height = source->y_height;
YV12_BUFFER_CONFIG sharpened;
memset(&sharpened, 0, sizeof(sharpened));
aom_alloc_frame_buffer(
&sharpened, width, height, source->subsampling_x, source->subsampling_y,
cm->seq_params->use_highbitdepth, cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
const double baseline_variance = frame_average_variance(cpi, source);
double unsharp_amount;
if (unsharp_amount_start <= step_size) {
unsharp_amount = find_best_frame_unsharp_amount_loop(
cpi, source, blurred, &sharpened, 0.0, baseline_variance, 0.0,
step_size, max_loop_count, max_filter_amount);
} else {
double a0 = unsharp_amount_start - step_size, a1 = unsharp_amount_start;
double v0, v1;
unsharp(cpi, source, blurred, &sharpened, a0);
v0 = cal_approx_vmaf(cpi, baseline_variance, source, &sharpened);
unsharp(cpi, source, blurred, &sharpened, a1);
v1 = cal_approx_vmaf(cpi, baseline_variance, source, &sharpened);
if (fabs(v0 - v1) < 0.01) {
unsharp_amount = a0;
} else if (v0 > v1) {
unsharp_amount = find_best_frame_unsharp_amount_loop(
cpi, source, blurred, &sharpened, v0, baseline_variance, a0,
-step_size, max_loop_count, max_filter_amount);
} else {
unsharp_amount = find_best_frame_unsharp_amount_loop(
cpi, source, blurred, &sharpened, v1, baseline_variance, a1,
step_size, max_loop_count, max_filter_amount);
}
}
aom_free_frame_buffer(&sharpened);
return unsharp_amount;
}
void av1_vmaf_neg_preprocessing(AV1_COMP *const cpi,
const YV12_BUFFER_CONFIG *const source) {
const AV1_COMMON *const cm = &cpi->common;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int width = source->y_width;
const int height = source->y_height;
const GF_GROUP *const gf_group = &cpi->ppi->gf_group;
const int layer_depth =
AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], MAX_ARF_LAYERS - 1);
const double best_frame_unsharp_amount =
get_layer_value(cpi->vmaf_info.last_frame_unsharp_amount, layer_depth);
if (best_frame_unsharp_amount <= 0.0) return;
YV12_BUFFER_CONFIG blurred;
memset(&blurred, 0, sizeof(blurred));
aom_alloc_frame_buffer(
&blurred, width, height, source->subsampling_x, source->subsampling_y,
cm->seq_params->use_highbitdepth, cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
gaussian_blur(bit_depth, source, &blurred);
unsharp(cpi, source, &blurred, source, best_frame_unsharp_amount);
aom_free_frame_buffer(&blurred);
}
void av1_vmaf_frame_preprocessing(AV1_COMP *const cpi,
const YV12_BUFFER_CONFIG *const source) {
const AV1_COMMON *const cm = &cpi->common;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int width = source->y_width;
const int height = source->y_height;
YV12_BUFFER_CONFIG source_extended, blurred;
memset(&source_extended, 0, sizeof(source_extended));
memset(&blurred, 0, sizeof(blurred));
aom_alloc_frame_buffer(
&source_extended, width, height, source->subsampling_x,
source->subsampling_y, cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels, cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(
&blurred, width, height, source->subsampling_x, source->subsampling_y,
cm->seq_params->use_highbitdepth, cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
av1_copy_and_extend_frame(source, &source_extended);
gaussian_blur(bit_depth, &source_extended, &blurred);
aom_free_frame_buffer(&source_extended);
const GF_GROUP *const gf_group = &cpi->ppi->gf_group;
const int layer_depth =
AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], MAX_ARF_LAYERS - 1);
const double last_frame_unsharp_amount =
get_layer_value(cpi->vmaf_info.last_frame_unsharp_amount, layer_depth);
const double best_frame_unsharp_amount = find_best_frame_unsharp_amount(
cpi, source, &blurred, last_frame_unsharp_amount, 0.05, 20, 1.01);
cpi->vmaf_info.last_frame_unsharp_amount[layer_depth] =
best_frame_unsharp_amount;
unsharp(cpi, source, &blurred, source, best_frame_unsharp_amount);
aom_free_frame_buffer(&blurred);
}
void av1_vmaf_blk_preprocessing(AV1_COMP *const cpi,
const YV12_BUFFER_CONFIG *const source) {
const AV1_COMMON *const cm = &cpi->common;
const int width = source->y_width;
const int height = source->y_height;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int ss_x = source->subsampling_x;
const int ss_y = source->subsampling_y;
YV12_BUFFER_CONFIG source_extended, blurred;
memset(&blurred, 0, sizeof(blurred));
memset(&source_extended, 0, sizeof(source_extended));
aom_alloc_frame_buffer(
&blurred, width, height, ss_x, ss_y, cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels, cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(&source_extended, width, height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
av1_copy_and_extend_frame(source, &source_extended);
gaussian_blur(bit_depth, &source_extended, &blurred);
aom_free_frame_buffer(&source_extended);
const GF_GROUP *const gf_group = &cpi->ppi->gf_group;
const int layer_depth =
AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], MAX_ARF_LAYERS - 1);
const double last_frame_unsharp_amount =
get_layer_value(cpi->vmaf_info.last_frame_unsharp_amount, layer_depth);
const double best_frame_unsharp_amount = find_best_frame_unsharp_amount(
cpi, source, &blurred, last_frame_unsharp_amount, 0.05, 20, 1.01);
cpi->vmaf_info.last_frame_unsharp_amount[layer_depth] =
best_frame_unsharp_amount;
const int block_size = BLOCK_64X64;
const int block_w = mi_size_wide[block_size] * 4;
const int block_h = mi_size_high[block_size] * 4;
const int num_cols = (source->y_width + block_w - 1) / block_w;
const int num_rows = (source->y_height + block_h - 1) / block_h;
double *best_unsharp_amounts =
aom_calloc(num_cols * num_rows, sizeof(*best_unsharp_amounts));
if (!best_unsharp_amounts) {
aom_internal_error(cm->error, AOM_CODEC_MEM_ERROR,
"Error allocating vmaf data");
}
YV12_BUFFER_CONFIG source_block, blurred_block;
memset(&source_block, 0, sizeof(source_block));
memset(&blurred_block, 0, sizeof(blurred_block));
aom_alloc_frame_buffer(&source_block, block_w, block_h, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(&blurred_block, block_w, block_h, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
for (int row = 0; row < num_rows; ++row) {
for (int col = 0; col < num_cols; ++col) {
const int row_offset_y = row * block_h;
const int col_offset_y = col * block_w;
const int block_width = AOMMIN(width - col_offset_y, block_w);
const int block_height = AOMMIN(height - row_offset_y, block_h);
const int index = col + row * num_cols;
if (cm->seq_params->use_highbitdepth) {
assert(source->flags & YV12_FLAG_HIGHBITDEPTH);
assert(blurred.flags & YV12_FLAG_HIGHBITDEPTH);
uint16_t *frame_src_buf = CONVERT_TO_SHORTPTR(source->y_buffer) +
row_offset_y * source->y_stride +
col_offset_y;
uint16_t *frame_blurred_buf = CONVERT_TO_SHORTPTR(blurred.y_buffer) +
row_offset_y * blurred.y_stride +
col_offset_y;
uint16_t *blurred_dst = CONVERT_TO_SHORTPTR(blurred_block.y_buffer);
uint16_t *src_dst = CONVERT_TO_SHORTPTR(source_block.y_buffer);
// Copy block from source frame.
for (int i = 0; i < block_h; ++i) {
for (int j = 0; j < block_w; ++j) {
if (i >= block_height || j >= block_width) {
src_dst[j] = 0;
blurred_dst[j] = 0;
} else {
src_dst[j] = frame_src_buf[j];
blurred_dst[j] = frame_blurred_buf[j];
}
}
frame_src_buf += source->y_stride;
frame_blurred_buf += blurred.y_stride;
src_dst += source_block.y_stride;
blurred_dst += blurred_block.y_stride;
}
} else {
uint8_t *frame_src_buf =
source->y_buffer + row_offset_y * source->y_stride + col_offset_y;
uint8_t *frame_blurred_buf =
blurred.y_buffer + row_offset_y * blurred.y_stride + col_offset_y;
uint8_t *blurred_dst = blurred_block.y_buffer;
uint8_t *src_dst = source_block.y_buffer;
// Copy block from source frame.
for (int i = 0; i < block_h; ++i) {
for (int j = 0; j < block_w; ++j) {
if (i >= block_height || j >= block_width) {
src_dst[j] = 0;
blurred_dst[j] = 0;
} else {
src_dst[j] = frame_src_buf[j];
blurred_dst[j] = frame_blurred_buf[j];
}
}
frame_src_buf += source->y_stride;
frame_blurred_buf += blurred.y_stride;
src_dst += source_block.y_stride;
blurred_dst += blurred_block.y_stride;
}
}
best_unsharp_amounts[index] = find_best_frame_unsharp_amount(
cpi, &source_block, &blurred_block, best_frame_unsharp_amount, 0.1, 3,
1.5);
}
}
// Apply best blur amounts
for (int row = 0; row < num_rows; ++row) {
for (int col = 0; col < num_cols; ++col) {
const int row_offset_y = row * block_h;
const int col_offset_y = col * block_w;
const int block_width = AOMMIN(source->y_width - col_offset_y, block_w);
const int block_height = AOMMIN(source->y_height - row_offset_y, block_h);
const int index = col + row * num_cols;
if (cm->seq_params->use_highbitdepth) {
assert(source->flags & YV12_FLAG_HIGHBITDEPTH);
assert(blurred.flags & YV12_FLAG_HIGHBITDEPTH);
uint16_t *src_buf = CONVERT_TO_SHORTPTR(source->y_buffer) +
row_offset_y * source->y_stride + col_offset_y;
uint16_t *blurred_buf = CONVERT_TO_SHORTPTR(blurred.y_buffer) +
row_offset_y * blurred.y_stride + col_offset_y;
highbd_unsharp_rect(src_buf, source->y_stride, blurred_buf,
blurred.y_stride, src_buf, source->y_stride,
block_width, block_height,
best_unsharp_amounts[index], bit_depth);
} else {
uint8_t *src_buf =
source->y_buffer + row_offset_y * source->y_stride + col_offset_y;
uint8_t *blurred_buf =
blurred.y_buffer + row_offset_y * blurred.y_stride + col_offset_y;
unsharp_rect(src_buf, source->y_stride, blurred_buf, blurred.y_stride,
src_buf, source->y_stride, block_width, block_height,
best_unsharp_amounts[index]);
}
}
}
aom_free_frame_buffer(&source_block);
aom_free_frame_buffer(&blurred_block);
aom_free_frame_buffer(&blurred);
aom_free(best_unsharp_amounts);
}
void av1_set_mb_vmaf_rdmult_scaling(AV1_COMP *cpi) {
AV1_COMMON *cm = &cpi->common;
const int y_width = cpi->source->y_width;
const int y_height = cpi->source->y_height;
const int resized_block_size = BLOCK_32X32;
const int resize_factor = 2;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int ss_x = cpi->source->subsampling_x;
const int ss_y = cpi->source->subsampling_y;
YV12_BUFFER_CONFIG resized_source;
memset(&resized_source, 0, sizeof(resized_source));
aom_alloc_frame_buffer(
&resized_source, y_width / resize_factor, y_height / resize_factor, ss_x,
ss_y, cm->seq_params->use_highbitdepth, cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
if (!av1_resize_and_extend_frame_nonnormative(
cpi->source, &resized_source, bit_depth, av1_num_planes(cm))) {
aom_internal_error(cm->error, AOM_CODEC_MEM_ERROR,
"Error allocating buffers during resize");
}
const int resized_y_width = resized_source.y_width;
const int resized_y_height = resized_source.y_height;
const int resized_block_w = mi_size_wide[resized_block_size] * 4;
const int resized_block_h = mi_size_high[resized_block_size] * 4;
const int num_cols =
(resized_y_width + resized_block_w - 1) / resized_block_w;
const int num_rows =
(resized_y_height + resized_block_h - 1) / resized_block_h;
YV12_BUFFER_CONFIG blurred;
memset(&blurred, 0, sizeof(blurred));
aom_alloc_frame_buffer(&blurred, resized_y_width, resized_y_height, ss_x,
ss_y, cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
gaussian_blur(bit_depth, &resized_source, &blurred);
YV12_BUFFER_CONFIG recon;
memset(&recon, 0, sizeof(recon));
aom_alloc_frame_buffer(&recon, resized_y_width, resized_y_height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_yv12_copy_frame(&resized_source, &recon, 1);
VmafContext *vmaf_context;
const bool cal_vmaf_neg =
cpi->oxcf.tune_cfg.tuning == AOM_TUNE_VMAF_NEG_MAX_GAIN;
aom_init_vmaf_context(&vmaf_context, cpi->vmaf_info.vmaf_model, cal_vmaf_neg);
unsigned int *sses = aom_calloc(num_rows * num_cols, sizeof(*sses));
if (!sses) {
aom_internal_error(cm->error, AOM_CODEC_MEM_ERROR,
"Error allocating vmaf data");
}
// Loop through each 'block_size' 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 row_offset_y = row * resized_block_h;
const int col_offset_y = col * resized_block_w;
uint8_t *const orig_buf = resized_source.y_buffer +
row_offset_y * resized_source.y_stride +
col_offset_y;
uint8_t *const blurred_buf =
blurred.y_buffer + row_offset_y * blurred.y_stride + col_offset_y;
cpi->ppi->fn_ptr[resized_block_size].vf(orig_buf, resized_source.y_stride,
blurred_buf, blurred.y_stride,
&sses[index]);
uint8_t *const recon_buf =
recon.y_buffer + row_offset_y * recon.y_stride + col_offset_y;
// Set recon buf
if (cpi->common.seq_params->use_highbitdepth) {
highbd_unsharp_rect(CONVERT_TO_SHORTPTR(blurred_buf), blurred.y_stride,
CONVERT_TO_SHORTPTR(blurred_buf), blurred.y_stride,
CONVERT_TO_SHORTPTR(recon_buf), recon.y_stride,
resized_block_w, resized_block_h, 0.0, bit_depth);
} else {
unsharp_rect(blurred_buf, blurred.y_stride, blurred_buf,
blurred.y_stride, recon_buf, recon.y_stride,
resized_block_w, resized_block_h, 0.0);
}
aom_read_vmaf_image(vmaf_context, &resized_source, &recon, bit_depth,
index);
// Restore recon buf
if (cpi->common.seq_params->use_highbitdepth) {
highbd_unsharp_rect(
CONVERT_TO_SHORTPTR(orig_buf), resized_source.y_stride,
CONVERT_TO_SHORTPTR(orig_buf), resized_source.y_stride,
CONVERT_TO_SHORTPTR(recon_buf), recon.y_stride, resized_block_w,
resized_block_h, 0.0, bit_depth);
} else {
unsharp_rect(orig_buf, resized_source.y_stride, orig_buf,
resized_source.y_stride, recon_buf, recon.y_stride,
resized_block_w, resized_block_h, 0.0);
}
}
}
aom_flush_vmaf_context(vmaf_context);
for (int row = 0; row < num_rows; ++row) {
for (int col = 0; col < num_cols; ++col) {
const int index = row * num_cols + col;
const double vmaf = aom_calc_vmaf_at_index(
vmaf_context, cpi->vmaf_info.vmaf_model, index);
const double dvmaf = kBaselineVmaf - vmaf;
const double mse =
(double)sses[index] / (double)(resized_y_width * resized_y_height);
double weight;
const double eps = 0.01 / (num_rows * num_cols);
if (dvmaf < eps || mse < eps) {
weight = 1.0;
} else {
weight = mse / dvmaf;
}
// Normalize it with a data fitted model.
weight = 6.0 * (1.0 - exp(-0.05 * weight)) + 0.8;
cpi->vmaf_info.rdmult_scaling_factors[index] = weight;
}
}
aom_free_frame_buffer(&resized_source);
aom_free_frame_buffer(&blurred);
aom_close_vmaf_context(vmaf_context);
aom_free(sses);
}
void av1_set_vmaf_rdmult(const AV1_COMP *const cpi, MACROBLOCK *const x,
const BLOCK_SIZE bsize, const int mi_row,
const int mi_col, int *const rdmult) {
const AV1_COMMON *const cm = &cpi->common;
const int bsize_base = BLOCK_64X64;
const int num_mi_w = mi_size_wide[bsize_base];
const int num_mi_h = mi_size_high[bsize_base];
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;
int row, col;
double num_of_mi = 0.0;
double geom_mean_of_scale = 0.0;
for (row = mi_row / num_mi_w;
row < num_rows && row < mi_row / num_mi_w + num_brows; ++row) {
for (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->vmaf_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);
}
// TODO(sdeng): replace them with the SIMD versions.
static AOM_INLINE double highbd_image_sad_c(const uint16_t *src, int src_stride,
const uint16_t *ref, int ref_stride,
int w, int h) {
double accum = 0.0;
int i, j;
for (i = 0; i < h; ++i) {
for (j = 0; j < w; ++j) {
double img1px = src[i * src_stride + j];
double img2px = ref[i * ref_stride + j];
accum += fabs(img1px - img2px);
}
}
return accum / (double)(h * w);
}
static AOM_INLINE double image_sad_c(const uint8_t *src, int src_stride,
const uint8_t *ref, int ref_stride, int w,
int h) {
double accum = 0.0;
int i, j;
for (i = 0; i < h; ++i) {
for (j = 0; j < w; ++j) {
double img1px = src[i * src_stride + j];
double img2px = ref[i * ref_stride + j];
accum += fabs(img1px - img2px);
}
}
return accum / (double)(h * w);
}
static double calc_vmaf_motion_score(const AV1_COMP *const cpi,
const AV1_COMMON *const cm,
const YV12_BUFFER_CONFIG *const cur,
const YV12_BUFFER_CONFIG *const last,
const YV12_BUFFER_CONFIG *const next) {
const int y_width = cur->y_width;
const int y_height = cur->y_height;
YV12_BUFFER_CONFIG blurred_cur, blurred_last, blurred_next;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int ss_x = cur->subsampling_x;
const int ss_y = cur->subsampling_y;
memset(&blurred_cur, 0, sizeof(blurred_cur));
memset(&blurred_last, 0, sizeof(blurred_last));
memset(&blurred_next, 0, sizeof(blurred_next));
aom_alloc_frame_buffer(&blurred_cur, y_width, y_height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(&blurred_last, y_width, y_height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(&blurred_next, y_width, y_height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
gaussian_blur(bit_depth, cur, &blurred_cur);
gaussian_blur(bit_depth, last, &blurred_last);
if (next) gaussian_blur(bit_depth, next, &blurred_next);
double motion1, motion2 = 65536.0;
if (cm->seq_params->use_highbitdepth) {
assert(blurred_cur.flags & YV12_FLAG_HIGHBITDEPTH);
assert(blurred_last.flags & YV12_FLAG_HIGHBITDEPTH);
const float scale_factor = 1.0f / (float)(1 << (bit_depth - 8));
motion1 = highbd_image_sad_c(CONVERT_TO_SHORTPTR(blurred_cur.y_buffer),
blurred_cur.y_stride,
CONVERT_TO_SHORTPTR(blurred_last.y_buffer),
blurred_last.y_stride, y_width, y_height) *
scale_factor;
if (next) {
assert(blurred_next.flags & YV12_FLAG_HIGHBITDEPTH);
motion2 = highbd_image_sad_c(CONVERT_TO_SHORTPTR(blurred_cur.y_buffer),
blurred_cur.y_stride,
CONVERT_TO_SHORTPTR(blurred_next.y_buffer),
blurred_next.y_stride, y_width, y_height) *
scale_factor;
}
} else {
motion1 = image_sad_c(blurred_cur.y_buffer, blurred_cur.y_stride,
blurred_last.y_buffer, blurred_last.y_stride, y_width,
y_height);
if (next) {
motion2 = image_sad_c(blurred_cur.y_buffer, blurred_cur.y_stride,
blurred_next.y_buffer, blurred_next.y_stride,
y_width, y_height);
}
}
aom_free_frame_buffer(&blurred_cur);
aom_free_frame_buffer(&blurred_last);
aom_free_frame_buffer(&blurred_next);
return AOMMIN(motion1, motion2);
}
static AOM_INLINE void get_neighbor_frames(const AV1_COMP *const cpi,
const YV12_BUFFER_CONFIG **last,
const YV12_BUFFER_CONFIG **next) {
const AV1_COMMON *const cm = &cpi->common;
const GF_GROUP *gf_group = &cpi->ppi->gf_group;
const int src_index =
cm->show_frame != 0 ? 0 : gf_group->arf_src_offset[cpi->gf_frame_index];
struct lookahead_entry *last_entry = av1_lookahead_peek(
cpi->ppi->lookahead, src_index - 1, cpi->compressor_stage);
struct lookahead_entry *next_entry = av1_lookahead_peek(
cpi->ppi->lookahead, src_index + 1, cpi->compressor_stage);
*next = &next_entry->img;
*last = cm->show_frame ? cpi->last_source : &last_entry->img;
}
// Calculates the new qindex from the VMAF motion score. This is based on the
// observation: when the motion score becomes higher, the VMAF score of the
// same source and distorted frames would become higher.
int av1_get_vmaf_base_qindex(const AV1_COMP *const cpi, int current_qindex) {
const AV1_COMMON *const cm = &cpi->common;
if (cm->current_frame.frame_number == 0 || cpi->oxcf.pass == 1) {
return current_qindex;
}
const GF_GROUP *const gf_group = &cpi->ppi->gf_group;
const int layer_depth =
AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], MAX_ARF_LAYERS - 1);
const double last_frame_ysse =
get_layer_value(cpi->vmaf_info.last_frame_ysse, layer_depth);
const double last_frame_vmaf =
get_layer_value(cpi->vmaf_info.last_frame_vmaf, layer_depth);
const int bit_depth = cpi->td.mb.e_mbd.bd;
const double approx_sse = last_frame_ysse / (double)((1 << (bit_depth - 8)) *
(1 << (bit_depth - 8)));
const double approx_dvmaf = kBaselineVmaf - last_frame_vmaf;
const double sse_threshold =
0.01 * cpi->source->y_width * cpi->source->y_height;
const double vmaf_threshold = 0.01;
if (approx_sse < sse_threshold || approx_dvmaf < vmaf_threshold) {
return current_qindex;
}
const YV12_BUFFER_CONFIG *cur_buf = cpi->source;
if (cm->show_frame == 0) {
const int src_index = gf_group->arf_src_offset[cpi->gf_frame_index];
struct lookahead_entry *cur_entry = av1_lookahead_peek(
cpi->ppi->lookahead, src_index, cpi->compressor_stage);
cur_buf = &cur_entry->img;
}
assert(cur_buf);
const YV12_BUFFER_CONFIG *next_buf, *last_buf;
get_neighbor_frames(cpi, &last_buf, &next_buf);
assert(last_buf);
const double motion =
calc_vmaf_motion_score(cpi, cm, cur_buf, last_buf, next_buf);
// Get dVMAF through a data fitted model.
const double dvmaf = 26.11 * (1.0 - exp(-0.06 * motion));
const double dsse = dvmaf * approx_sse / approx_dvmaf;
// Clamping beta to address VQ issue (aomedia:3170).
const double beta = AOMMAX(approx_sse / (dsse + approx_sse), 0.5);
const int offset =
av1_get_deltaq_offset(cm->seq_params->bit_depth, current_qindex, beta);
int qindex = current_qindex + offset;
qindex = AOMMIN(qindex, MAXQ);
qindex = AOMMAX(qindex, MINQ);
return qindex;
}
static AOM_INLINE double cal_approx_score(
AV1_COMP *const cpi, double src_variance, double new_variance,
double src_score, const YV12_BUFFER_CONFIG *const src,
const YV12_BUFFER_CONFIG *const recon_sharpened) {
double score;
const uint32_t bit_depth = cpi->td.mb.e_mbd.bd;
const bool cal_vmaf_neg =
cpi->oxcf.tune_cfg.tuning == AOM_TUNE_VMAF_NEG_MAX_GAIN;
aom_calc_vmaf(cpi->vmaf_info.vmaf_model, src, recon_sharpened, bit_depth,
cal_vmaf_neg, &score);
return src_variance / new_variance * (score - src_score);
}
static double find_best_frame_unsharp_amount_loop_neg(
AV1_COMP *const cpi, double src_variance, double base_score,
const YV12_BUFFER_CONFIG *const src, const YV12_BUFFER_CONFIG *const recon,
const YV12_BUFFER_CONFIG *const ref,
const YV12_BUFFER_CONFIG *const src_blurred,
const YV12_BUFFER_CONFIG *const recon_blurred,
const YV12_BUFFER_CONFIG *const src_sharpened,
const YV12_BUFFER_CONFIG *const recon_sharpened, FULLPEL_MV *mvs,
double best_score, const double unsharp_amount_start,
const double step_size, const int max_loop_count, const double max_amount) {
const double min_amount = 0.0;
int loop_count = 0;
double approx_score = best_score;
double unsharp_amount = unsharp_amount_start;
do {
best_score = approx_score;
unsharp_amount += step_size;
if (unsharp_amount > max_amount || unsharp_amount < min_amount) break;
unsharp(cpi, recon, recon_blurred, recon_sharpened, unsharp_amount);
unsharp(cpi, src, src_blurred, src_sharpened, unsharp_amount);
const double new_variance =
residual_frame_average_variance(cpi, src_sharpened, ref, mvs);
approx_score = cal_approx_score(cpi, src_variance, new_variance, base_score,
src, recon_sharpened);
loop_count++;
} while (approx_score > best_score && loop_count < max_loop_count);
unsharp_amount =
approx_score > best_score ? unsharp_amount : unsharp_amount - step_size;
return AOMMIN(max_amount, AOMMAX(unsharp_amount, min_amount));
}
static double find_best_frame_unsharp_amount_neg(
AV1_COMP *const cpi, const YV12_BUFFER_CONFIG *const src,
const YV12_BUFFER_CONFIG *const recon, const YV12_BUFFER_CONFIG *const ref,
double base_score, const double unsharp_amount_start,
const double step_size, const int max_loop_count,
const double max_filter_amount) {
FULLPEL_MV *mvs = NULL;
const double src_variance =
residual_frame_average_variance(cpi, src, ref, mvs);
const AV1_COMMON *const cm = &cpi->common;
const int width = recon->y_width;
const int height = recon->y_height;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const int ss_x = recon->subsampling_x;
const int ss_y = recon->subsampling_y;
YV12_BUFFER_CONFIG src_blurred, recon_blurred, src_sharpened, recon_sharpened;
memset(&recon_sharpened, 0, sizeof(recon_sharpened));
memset(&src_sharpened, 0, sizeof(src_sharpened));
memset(&recon_blurred, 0, sizeof(recon_blurred));
memset(&src_blurred, 0, sizeof(src_blurred));
aom_alloc_frame_buffer(&recon_sharpened, width, height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(&src_sharpened, width, height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(&recon_blurred, width, height, ss_x, ss_y,
cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels,
cm->features.byte_alignment, 0, 0);
aom_alloc_frame_buffer(
&src_blurred, width, height, ss_x, ss_y, cm->seq_params->use_highbitdepth,
cpi->oxcf.border_in_pixels, cm->features.byte_alignment, 0, 0);
gaussian_blur(bit_depth, recon, &recon_blurred);
gaussian_blur(bit_depth, src, &src_blurred);
unsharp(cpi, recon, &recon_blurred, &recon_sharpened, unsharp_amount_start);
unsharp(cpi, src, &src_blurred, &src_sharpened, unsharp_amount_start);
const double variance_start =
residual_frame_average_variance(cpi, &src_sharpened, ref, mvs);
const double score_start = cal_approx_score(
cpi, src_variance, variance_start, base_score, src, &recon_sharpened);
const double unsharp_amount_next = unsharp_amount_start + step_size;
unsharp(cpi, recon, &recon_blurred, &recon_sharpened, unsharp_amount_next);
unsharp(cpi, src, &src_blurred, &src_sharpened, unsharp_amount_next);
const double variance_next =
residual_frame_average_variance(cpi, &src_sharpened, ref, mvs);
const double score_next = cal_approx_score(cpi, src_variance, variance_next,
base_score, src, &recon_sharpened);
double unsharp_amount;
if (score_next > score_start) {
unsharp_amount = find_best_frame_unsharp_amount_loop_neg(
cpi, src_variance, base_score, src, recon, ref, &src_blurred,
&recon_blurred, &src_sharpened, &recon_sharpened, mvs, score_next,
unsharp_amount_next, step_size, max_loop_count, max_filter_amount);
} else {
unsharp_amount = find_best_frame_unsharp_amount_loop_neg(
cpi, src_variance, base_score, src, recon, ref, &src_blurred,
&recon_blurred, &src_sharpened, &recon_sharpened, mvs, score_start,
unsharp_amount_start, -step_size, max_loop_count, max_filter_amount);
}
aom_free_frame_buffer(&recon_sharpened);
aom_free_frame_buffer(&src_sharpened);
aom_free_frame_buffer(&recon_blurred);
aom_free_frame_buffer(&src_blurred);
aom_free(mvs);
return unsharp_amount;
}
void av1_update_vmaf_curve(AV1_COMP *cpi) {
const YV12_BUFFER_CONFIG *source = cpi->source;
const YV12_BUFFER_CONFIG *recon = &cpi->common.cur_frame->buf;
const int bit_depth = cpi->td.mb.e_mbd.bd;
const GF_GROUP *const gf_group = &cpi->ppi->gf_group;
const int layer_depth =
AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], MAX_ARF_LAYERS - 1);
double base_score;
const bool cal_vmaf_neg =
cpi->oxcf.tune_cfg.tuning == AOM_TUNE_VMAF_NEG_MAX_GAIN;
aom_calc_vmaf(cpi->vmaf_info.vmaf_model, source, recon, bit_depth,
cal_vmaf_neg, &base_score);
cpi->vmaf_info.last_frame_vmaf[layer_depth] = base_score;
if (cpi->common.seq_params->use_highbitdepth) {
assert(source->flags & YV12_FLAG_HIGHBITDEPTH);
assert(recon->flags & YV12_FLAG_HIGHBITDEPTH);
cpi->vmaf_info.last_frame_ysse[layer_depth] =
(double)aom_highbd_get_y_sse(source, recon);
} else {
cpi->vmaf_info.last_frame_ysse[layer_depth] =
(double)aom_get_y_sse(source, recon);
}
if (cpi->oxcf.tune_cfg.tuning == AOM_TUNE_VMAF_NEG_MAX_GAIN) {
const YV12_BUFFER_CONFIG *last, *next;
get_neighbor_frames(cpi, &last, &next);
double best_unsharp_amount_start =
get_layer_value(cpi->vmaf_info.last_frame_unsharp_amount, layer_depth);
const int max_loop_count = 5;
cpi->vmaf_info.last_frame_unsharp_amount[layer_depth] =
find_best_frame_unsharp_amount_neg(cpi, source, recon, last, base_score,
best_unsharp_amount_start, 0.025,
max_loop_count, 1.01);
}
}