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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/refined_filter_update_gain.h"
#include <algorithm>
#include <functional>
#include "modules/audio_processing/aec3/adaptive_fir_filter.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/aec3/echo_path_variability.h"
#include "modules/audio_processing/aec3/fft_data.h"
#include "modules/audio_processing/aec3/render_signal_analyzer.h"
#include "modules/audio_processing/aec3/subtractor_output.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
constexpr float kHErrorInitial = 10000.f;
constexpr int kPoorExcitationCounterInitial = 1000;
} // namespace
std::atomic<int> RefinedFilterUpdateGain::instance_count_(0);
RefinedFilterUpdateGain::RefinedFilterUpdateGain(
const EchoCanceller3Config::Filter::RefinedConfiguration& config,
size_t config_change_duration_blocks)
: data_dumper_(new ApmDataDumper(instance_count_.fetch_add(1) + 1)),
config_change_duration_blocks_(
static_cast<int>(config_change_duration_blocks)),
poor_excitation_counter_(kPoorExcitationCounterInitial) {
SetConfig(config, true);
H_error_.fill(kHErrorInitial);
RTC_DCHECK_LT(0, config_change_duration_blocks_);
one_by_config_change_duration_blocks_ = 1.f / config_change_duration_blocks_;
}
RefinedFilterUpdateGain::~RefinedFilterUpdateGain() {}
void RefinedFilterUpdateGain::HandleEchoPathChange(
const EchoPathVariability& echo_path_variability) {
if (echo_path_variability.gain_change) {
// TODO(bugs.webrtc.org/9526) Handle gain changes.
}
if (echo_path_variability.delay_change !=
EchoPathVariability::DelayAdjustment::kNone) {
H_error_.fill(kHErrorInitial);
}
if (!echo_path_variability.gain_change) {
poor_excitation_counter_ = kPoorExcitationCounterInitial;
call_counter_ = 0;
}
}
void RefinedFilterUpdateGain::Compute(
const std::array<float, kFftLengthBy2Plus1>& render_power,
const RenderSignalAnalyzer& render_signal_analyzer,
const SubtractorOutput& subtractor_output,
rtc::ArrayView<const float> erl,
size_t size_partitions,
bool saturated_capture_signal,
bool disallow_leakage_diverged,
FftData* gain_fft) {
RTC_DCHECK(gain_fft);
// Introducing shorter notation to improve readability.
const FftData& E_refined = subtractor_output.E_refined;
const auto& E2_refined = subtractor_output.E2_refined;
const auto& E2_coarse = subtractor_output.E2_coarse;
FftData* G = gain_fft;
const auto& X2 = render_power;
++call_counter_;
UpdateCurrentConfig();
if (render_signal_analyzer.PoorSignalExcitation()) {
poor_excitation_counter_ = 0;
}
// Do not update the filter if the render is not sufficiently excited.
if (++poor_excitation_counter_ < size_partitions ||
saturated_capture_signal || call_counter_ <= size_partitions) {
G->re.fill(0.f);
G->im.fill(0.f);
} else {
// Corresponds to WGN of power -39 dBFS.
std::array<float, kFftLengthBy2Plus1> mu;
// mu = H_error / (0.5* H_error* X2 + n * E2).
for (size_t k = 0; k < kFftLengthBy2Plus1; ++k) {
if (X2[k] >= current_config_.noise_gate) {
mu[k] = H_error_[k] /
(0.5f * H_error_[k] * X2[k] + size_partitions * E2_refined[k]);
} else {
mu[k] = 0.f;
}
}
// Avoid updating the filter close to narrow bands in the render signals.
render_signal_analyzer.MaskRegionsAroundNarrowBands(&mu);
// H_error = H_error - 0.5 * mu * X2 * H_error.
for (size_t k = 0; k < kFftLengthBy2Plus1; ++k) {
H_error_[k] -= 0.5f * mu[k] * X2[k] * H_error_[k];
}
// G = mu * E.
for (size_t k = 0; k < kFftLengthBy2Plus1; ++k) {
G->re[k] = mu[k] * E_refined.re[k];
G->im[k] = mu[k] * E_refined.im[k];
}
}
// H_error = H_error + factor * erl.
for (size_t k = 0; k < kFftLengthBy2Plus1; ++k) {
if (E2_refined[k] <= E2_coarse[k] || disallow_leakage_diverged) {
H_error_[k] += current_config_.leakage_converged * erl[k];
} else {
H_error_[k] += current_config_.leakage_diverged * erl[k];
}
H_error_[k] = std::max(H_error_[k], current_config_.error_floor);
H_error_[k] = std::min(H_error_[k], current_config_.error_ceil);
}
data_dumper_->DumpRaw("aec3_refined_gain_H_error", H_error_);
}
void RefinedFilterUpdateGain::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_.leakage_converged =
average(old_target_config_.leakage_converged,
target_config_.leakage_converged, change_factor);
current_config_.leakage_diverged =
average(old_target_config_.leakage_diverged,
target_config_.leakage_diverged, change_factor);
current_config_.error_floor =
average(old_target_config_.error_floor, target_config_.error_floor,
change_factor);
current_config_.error_ceil =
average(old_target_config_.error_ceil, target_config_.error_ceil,
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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