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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdlib.h>
#include "webrtc/modules/video_processing/util/denoiser_filter_c.h"
namespace webrtc {
void DenoiserFilterC::CopyMem16x16(const uint8_t* src,
int src_stride,
uint8_t* dst,
int dst_stride) {
for (int i = 0; i < 16; i++) {
memcpy(dst, src, 16);
src += src_stride;
dst += dst_stride;
}
}
void DenoiserFilterC::CopyMem8x8(const uint8_t* src,
int src_stride,
uint8_t* dst,
int dst_stride) {
for (int i = 0; i < 8; i++) {
memcpy(dst, src, 8);
src += src_stride;
dst += dst_stride;
}
}
uint32_t DenoiserFilterC::Variance16x8(const uint8_t* a,
int a_stride,
const uint8_t* b,
int b_stride,
uint32_t* sse) {
int sum = 0;
*sse = 0;
a_stride <<= 1;
b_stride <<= 1;
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 16; j++) {
const int diff = a[j] - b[j];
sum += diff;
*sse += diff * diff;
}
a += a_stride;
b += b_stride;
}
return *sse - ((static_cast<int64_t>(sum) * sum) >> 7);
}
DenoiserDecision DenoiserFilterC::MbDenoise(uint8_t* mc_running_avg_y,
int mc_avg_y_stride,
uint8_t* running_avg_y,
int avg_y_stride,
const uint8_t* sig,
int sig_stride,
uint8_t motion_magnitude,
int increase_denoising) {
int sum_diff_thresh = 0;
int sum_diff = 0;
int adj_val[3] = {3, 4, 6};
int shift_inc1 = 0;
int shift_inc2 = 1;
int col_sum[16] = {0};
if (motion_magnitude <= kMotionMagnitudeThreshold) {
if (increase_denoising) {
shift_inc1 = 1;
shift_inc2 = 2;
}
adj_val[0] += shift_inc2;
adj_val[1] += shift_inc2;
adj_val[2] += shift_inc2;
}
for (int r = 0; r < 16; ++r) {
for (int c = 0; c < 16; ++c) {
int diff = 0;
int adjustment = 0;
int absdiff = 0;
diff = mc_running_avg_y[c] - sig[c];
absdiff = abs(diff);
// When |diff| <= |3 + shift_inc1|, use pixel value from
// last denoised raw.
if (absdiff <= 3 + shift_inc1) {
running_avg_y[c] = mc_running_avg_y[c];
col_sum[c] += diff;
} else {
if (absdiff >= 4 + shift_inc1 && absdiff <= 7)
adjustment = adj_val[0];
else if (absdiff >= 8 && absdiff <= 15)
adjustment = adj_val[1];
else
adjustment = adj_val[2];
if (diff > 0) {
if ((sig[c] + adjustment) > 255)
running_avg_y[c] = 255;
else
running_avg_y[c] = sig[c] + adjustment;
col_sum[c] += adjustment;
} else {
if ((sig[c] - adjustment) < 0)
running_avg_y[c] = 0;
else
running_avg_y[c] = sig[c] - adjustment;
col_sum[c] -= adjustment;
}
}
}
// Update pointers for next iteration.
sig += sig_stride;
mc_running_avg_y += mc_avg_y_stride;
running_avg_y += avg_y_stride;
}
for (int c = 0; c < 16; ++c) {
if (col_sum[c] >= 128) {
col_sum[c] = 127;
}
sum_diff += col_sum[c];
}
sum_diff_thresh = kSumDiffThreshold;
if (increase_denoising)
sum_diff_thresh = kSumDiffThresholdHigh;
if (abs(sum_diff) > sum_diff_thresh) {
int delta = ((abs(sum_diff) - sum_diff_thresh) >> 8) + 1;
// Only apply the adjustment for max delta up to 3.
if (delta < 4) {
sig -= sig_stride * 16;
mc_running_avg_y -= mc_avg_y_stride * 16;
running_avg_y -= avg_y_stride * 16;
for (int r = 0; r < 16; ++r) {
for (int c = 0; c < 16; ++c) {
int diff = mc_running_avg_y[c] - sig[c];
int adjustment = abs(diff);
if (adjustment > delta)
adjustment = delta;
if (diff > 0) {
// Bring denoised signal down.
if (running_avg_y[c] - adjustment < 0)
running_avg_y[c] = 0;
else
running_avg_y[c] = running_avg_y[c] - adjustment;
col_sum[c] -= adjustment;
} else if (diff < 0) {
// Bring denoised signal up.
if (running_avg_y[c] + adjustment > 255)
running_avg_y[c] = 255;
else
running_avg_y[c] = running_avg_y[c] + adjustment;
col_sum[c] += adjustment;
}
}
sig += sig_stride;
mc_running_avg_y += mc_avg_y_stride;
running_avg_y += avg_y_stride;
}
sum_diff = 0;
for (int c = 0; c < 16; ++c) {
if (col_sum[c] >= 128) {
col_sum[c] = 127;
}
sum_diff += col_sum[c];
}
if (abs(sum_diff) > sum_diff_thresh)
return COPY_BLOCK;
} else {
return COPY_BLOCK;
}
}
return FILTER_BLOCK;
}
} // namespace webrtc
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