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/*
* Copyright (c) 2017 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 "modules/audio_processing/aec3/coarse_filter_update_gain.h"
#include <algorithm>
#include <functional>
#include "rtc_base/checks.h"
namespace webrtc {
CoarseFilterUpdateGain::CoarseFilterUpdateGain(
const EchoCanceller3Config::Filter::CoarseConfiguration& config,
size_t config_change_duration_blocks)
: config_change_duration_blocks_(
static_cast<int>(config_change_duration_blocks)) {
SetConfig(config, true);
RTC_DCHECK_LT(0, config_change_duration_blocks_);
one_by_config_change_duration_blocks_ = 1.f / config_change_duration_blocks_;
}
void CoarseFilterUpdateGain::HandleEchoPathChange() {
poor_signal_excitation_counter_ = 0;
call_counter_ = 0;
}
void CoarseFilterUpdateGain::Compute(
const std::array<float, kFftLengthBy2Plus1>& render_power,
const RenderSignalAnalyzer& render_signal_analyzer,
const FftData& E_coarse,
size_t size_partitions,
bool saturated_capture_signal,
FftData* G) {
RTC_DCHECK(G);
++call_counter_;
UpdateCurrentConfig();
if (render_signal_analyzer.PoorSignalExcitation()) {
poor_signal_excitation_counter_ = 0;
}
// Do not update the filter if the render is not sufficiently excited.
if (++poor_signal_excitation_counter_ < size_partitions ||
saturated_capture_signal || call_counter_ <= size_partitions) {
G->re.fill(0.f);
G->im.fill(0.f);
return;
}
// Compute mu.
std::array<float, kFftLengthBy2Plus1> mu;
const auto& X2 = render_power;
for (size_t k = 0; k < kFftLengthBy2Plus1; ++k) {
if (X2[k] > current_config_.noise_gate) {
mu[k] = current_config_.rate / X2[k];
} else {
mu[k] = 0.f;
}
}
// Avoid updating the filter close to narrow bands in the render signals.
render_signal_analyzer.MaskRegionsAroundNarrowBands(&mu);
// G = mu * E * X2.
for (size_t k = 0; k < kFftLengthBy2Plus1; ++k) {
G->re[k] = mu[k] * E_coarse.re[k];
G->im[k] = mu[k] * E_coarse.im[k];
}
}
void CoarseFilterUpdateGain::UpdateCurrentConfig() {
RTC_DCHECK_GE(config_change_duration_blocks_, config_change_counter_);
if (config_change_counter_ > 0) {
if (--config_change_counter_ > 0) {
auto average = [](float from, float to, float from_weight) {
return from * from_weight + to * (1.f - from_weight);
};
float change_factor =
config_change_counter_ * one_by_config_change_duration_blocks_;
current_config_.rate =
average(old_target_config_.rate, target_config_.rate, change_factor);
current_config_.noise_gate =
average(old_target_config_.noise_gate, target_config_.noise_gate,
change_factor);
} else {
current_config_ = old_target_config_ = target_config_;
}
}
RTC_DCHECK_LE(0, config_change_counter_);
}
} // namespace webrtc
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