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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/subtractor.h"
#include <algorithm>
#include <numeric>
#include "api/array_view.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_minmax.h"
#include "system_wrappers/include/field_trial.h"
namespace webrtc {
namespace {
bool EnableAgcGainChangeResponse() {
return !field_trial::IsEnabled("WebRTC-Aec3AgcGainChangeResponseKillSwitch");
}
bool EnableAdaptationDuringSaturation() {
return !field_trial::IsEnabled("WebRTC-Aec3RapidAgcGainRecoveryKillSwitch");
}
bool EnableMisadjustmentEstimator() {
return !field_trial::IsEnabled("WebRTC-Aec3MisadjustmentEstimatorKillSwitch");
}
bool EnableShadowFilterJumpstart() {
return !field_trial::IsEnabled("WebRTC-Aec3ShadowFilterJumpstartKillSwitch");
}
bool EnableShadowFilterBoostedJumpstart() {
return !field_trial::IsEnabled(
"WebRTC-Aec3ShadowFilterBoostedJumpstartKillSwitch");
}
bool EnableEarlyShadowFilterJumpstart() {
return !field_trial::IsEnabled(
"WebRTC-Aec3EarlyShadowFilterJumpstartKillSwitch");
}
void PredictionError(const Aec3Fft& fft,
const FftData& S,
rtc::ArrayView<const float> y,
std::array<float, kBlockSize>* e,
std::array<float, kBlockSize>* s,
bool adaptation_during_saturation,
bool* saturation) {
std::array<float, kFftLength> tmp;
fft.Ifft(S, &tmp);
constexpr float kScale = 1.0f / kFftLengthBy2;
std::transform(y.begin(), y.end(), tmp.begin() + kFftLengthBy2, e->begin(),
[&](float a, float b) { return a - b * kScale; });
*saturation = false;
if (s) {
for (size_t k = 0; k < s->size(); ++k) {
(*s)[k] = kScale * tmp[k + kFftLengthBy2];
}
auto result = std::minmax_element(s->begin(), s->end());
*saturation = *result.first <= -32768 || *result.first >= 32767;
}
if (!(*saturation)) {
auto result = std::minmax_element(e->begin(), e->end());
*saturation = *result.first <= -32768 || *result.first >= 32767;
}
if (!adaptation_during_saturation) {
std::for_each(e->begin(), e->end(),
[](float& a) { a = rtc::SafeClamp(a, -32768.f, 32767.f); });
} else {
*saturation = false;
}
}
void ScaleFilterOutput(rtc::ArrayView<const float> y,
float factor,
rtc::ArrayView<float> e,
rtc::ArrayView<float> s) {
RTC_DCHECK_EQ(y.size(), e.size());
RTC_DCHECK_EQ(y.size(), s.size());
for (size_t k = 0; k < y.size(); ++k) {
s[k] *= factor;
e[k] = y[k] - s[k];
}
}
} // namespace
Subtractor::Subtractor(const EchoCanceller3Config& config,
ApmDataDumper* data_dumper,
Aec3Optimization optimization)
: fft_(),
data_dumper_(data_dumper),
optimization_(optimization),
config_(config),
adaptation_during_saturation_(EnableAdaptationDuringSaturation()),
enable_misadjustment_estimator_(EnableMisadjustmentEstimator()),
enable_agc_gain_change_response_(EnableAgcGainChangeResponse()),
enable_shadow_filter_jumpstart_(EnableShadowFilterJumpstart()),
enable_shadow_filter_boosted_jumpstart_(
EnableShadowFilterBoostedJumpstart()),
enable_early_shadow_filter_jumpstart_(EnableEarlyShadowFilterJumpstart()),
main_filter_(config_.filter.main.length_blocks,
config_.filter.main_initial.length_blocks,
config.filter.config_change_duration_blocks,
optimization,
data_dumper_),
shadow_filter_(config_.filter.shadow.length_blocks,
config_.filter.shadow_initial.length_blocks,
config.filter.config_change_duration_blocks,
optimization,
data_dumper_),
G_main_(config_.filter.main_initial,
config_.filter.config_change_duration_blocks),
G_shadow_(config_.filter.shadow_initial,
config.filter.config_change_duration_blocks) {
RTC_DCHECK(data_dumper_);
}
Subtractor::~Subtractor() = default;
void Subtractor::HandleEchoPathChange(
const EchoPathVariability& echo_path_variability) {
const auto full_reset = [&]() {
main_filter_.HandleEchoPathChange();
shadow_filter_.HandleEchoPathChange();
G_main_.HandleEchoPathChange(echo_path_variability);
G_shadow_.HandleEchoPathChange();
G_main_.SetConfig(config_.filter.main_initial, true);
G_shadow_.SetConfig(config_.filter.shadow_initial, true);
main_filter_.SetSizePartitions(config_.filter.main_initial.length_blocks,
true);
shadow_filter_.SetSizePartitions(
config_.filter.shadow_initial.length_blocks, true);
};
if (echo_path_variability.delay_change !=
EchoPathVariability::DelayAdjustment::kNone) {
full_reset();
}
if (echo_path_variability.gain_change && enable_agc_gain_change_response_) {
G_main_.HandleEchoPathChange(echo_path_variability);
}
}
void Subtractor::ExitInitialState() {
G_main_.SetConfig(config_.filter.main, false);
G_shadow_.SetConfig(config_.filter.shadow, false);
main_filter_.SetSizePartitions(config_.filter.main.length_blocks, false);
shadow_filter_.SetSizePartitions(config_.filter.shadow.length_blocks, false);
}
void Subtractor::Process(const RenderBuffer& render_buffer,
const rtc::ArrayView<const float> capture,
const RenderSignalAnalyzer& render_signal_analyzer,
const AecState& aec_state,
SubtractorOutput* output) {
RTC_DCHECK_EQ(kBlockSize, capture.size());
rtc::ArrayView<const float> y = capture;
FftData& E_main = output->E_main;
FftData E_shadow;
std::array<float, kBlockSize>& e_main = output->e_main;
std::array<float, kBlockSize>& e_shadow = output->e_shadow;
FftData S;
FftData& G = S;
// Form the outputs of the main and shadow filters.
main_filter_.Filter(render_buffer, &S);
bool main_saturation = false;
PredictionError(fft_, S, y, &e_main, &output->s_main,
adaptation_during_saturation_, &main_saturation);
shadow_filter_.Filter(render_buffer, &S);
bool shadow_saturation = false;
PredictionError(fft_, S, y, &e_shadow, &output->s_shadow,
adaptation_during_saturation_, &shadow_saturation);
// Compute the signal powers in the subtractor output.
output->UpdatePowers(y);
// Adjust the filter if needed.
bool main_filter_adjusted = false;
if (enable_misadjustment_estimator_) {
filter_misadjustment_estimator_.Update(*output);
if (filter_misadjustment_estimator_.IsAdjustmentNeeded()) {
float scale = filter_misadjustment_estimator_.GetMisadjustment();
main_filter_.ScaleFilter(scale);
ScaleFilterOutput(y, scale, e_main, output->s_main);
filter_misadjustment_estimator_.Reset();
main_filter_adjusted = true;
}
}
// Compute the FFts of the main and shadow filter outputs.
fft_.ZeroPaddedFft(e_main, Aec3Fft::Window::kHanning, &E_main);
fft_.ZeroPaddedFft(e_shadow, Aec3Fft::Window::kHanning, &E_shadow);
// Compute spectra for future use.
E_shadow.Spectrum(optimization_, output->E2_shadow);
E_main.Spectrum(optimization_, output->E2_main);
// Compute the render powers.
std::array<float, kFftLengthBy2Plus1> X2_main;
std::array<float, kFftLengthBy2Plus1> X2_shadow_data;
std::array<float, kFftLengthBy2Plus1>& X2_shadow =
main_filter_.SizePartitions() == shadow_filter_.SizePartitions()
? X2_main
: X2_shadow_data;
if (main_filter_.SizePartitions() == shadow_filter_.SizePartitions()) {
render_buffer.SpectralSum(main_filter_.SizePartitions(), &X2_main);
} else if (main_filter_.SizePartitions() > shadow_filter_.SizePartitions()) {
render_buffer.SpectralSums(shadow_filter_.SizePartitions(),
main_filter_.SizePartitions(), &X2_shadow,
&X2_main);
} else {
render_buffer.SpectralSums(main_filter_.SizePartitions(),
shadow_filter_.SizePartitions(), &X2_main,
&X2_shadow);
}
// Update the main filter.
if (!main_filter_adjusted) {
G_main_.Compute(X2_main, render_signal_analyzer, *output, main_filter_,
aec_state.SaturatedCapture() || main_saturation, &G);
} else {
G.re.fill(0.f);
G.im.fill(0.f);
}
main_filter_.Adapt(render_buffer, G);
data_dumper_->DumpRaw("aec3_subtractor_G_main", G.re);
data_dumper_->DumpRaw("aec3_subtractor_G_main", G.im);
// Update the shadow filter.
poor_shadow_filter_counter_ =
output->e2_main < output->e2_shadow ? poor_shadow_filter_counter_ + 1 : 0;
if (((poor_shadow_filter_counter_ < 5 &&
enable_early_shadow_filter_jumpstart_) ||
(poor_shadow_filter_counter_ < 10 &&
!enable_early_shadow_filter_jumpstart_)) ||
!enable_shadow_filter_jumpstart_) {
G_shadow_.Compute(X2_shadow, render_signal_analyzer, E_shadow,
shadow_filter_.SizePartitions(),
aec_state.SaturatedCapture() || shadow_saturation, &G);
shadow_filter_.Adapt(render_buffer, G);
} else {
poor_shadow_filter_counter_ = 0;
if (enable_shadow_filter_boosted_jumpstart_) {
shadow_filter_.SetFilter(main_filter_.GetFilter());
G_shadow_.Compute(X2_shadow, render_signal_analyzer, E_main,
shadow_filter_.SizePartitions(),
aec_state.SaturatedCapture() || main_saturation, &G);
shadow_filter_.Adapt(render_buffer, G);
} else {
G.re.fill(0.f);
G.im.fill(0.f);
shadow_filter_.Adapt(render_buffer, G);
shadow_filter_.SetFilter(main_filter_.GetFilter());
}
}
data_dumper_->DumpRaw("aec3_subtractor_G_shadow", G.re);
data_dumper_->DumpRaw("aec3_subtractor_G_shadow", G.im);
filter_misadjustment_estimator_.Dump(data_dumper_);
DumpFilters();
if (adaptation_during_saturation_) {
std::for_each(e_main.begin(), e_main.end(),
[](float& a) { a = rtc::SafeClamp(a, -32768.f, 32767.f); });
}
data_dumper_->DumpWav("aec3_main_filter_output", kBlockSize, &e_main[0],
16000, 1);
data_dumper_->DumpWav("aec3_shadow_filter_output", kBlockSize, &e_shadow[0],
16000, 1);
}
void Subtractor::FilterMisadjustmentEstimator::Update(
const SubtractorOutput& output) {
e2_acum_ += output.e2_main;
y2_acum_ += output.y2;
if (++n_blocks_acum_ == n_blocks_) {
if (y2_acum_ > n_blocks_ * 200.f * 200.f * kBlockSize) {
float update = (e2_acum_ / y2_acum_);
if (e2_acum_ > n_blocks_ * 7500.f * 7500.f * kBlockSize) {
// Duration equal to blockSizeMs * n_blocks_ * 4.
overhang_ = 4;
} else {
overhang_ = std::max(overhang_ - 1, 0);
}
if ((update < inv_misadjustment_) || (overhang_ > 0)) {
inv_misadjustment_ += 0.1f * (update - inv_misadjustment_);
}
}
e2_acum_ = 0.f;
y2_acum_ = 0.f;
n_blocks_acum_ = 0;
}
}
void Subtractor::FilterMisadjustmentEstimator::Reset() {
e2_acum_ = 0.f;
y2_acum_ = 0.f;
n_blocks_acum_ = 0;
inv_misadjustment_ = 0.f;
overhang_ = 0.f;
}
void Subtractor::FilterMisadjustmentEstimator::Dump(
ApmDataDumper* data_dumper) const {
data_dumper->DumpRaw("aec3_inv_misadjustment_factor", inv_misadjustment_);
}
} // namespace webrtc