138 lines
5.0 KiB
C++
138 lines
5.0 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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#include <math.h>
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#include <stddef.h>
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#include <array>
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#include <vector>
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#include "api/array_view.h"
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#include "api/audio/echo_canceller3_config.h"
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#include "modules/audio_processing/aec3/adaptive_fir_filter.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/aec3/aec3_fft.h"
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#include "modules/audio_processing/aec3/aec_state.h"
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#include "modules/audio_processing/aec3/coarse_filter_update_gain.h"
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#include "modules/audio_processing/aec3/echo_path_variability.h"
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#include "modules/audio_processing/aec3/refined_filter_update_gain.h"
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#include "modules/audio_processing/aec3/render_buffer.h"
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#include "modules/audio_processing/aec3/render_signal_analyzer.h"
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#include "modules/audio_processing/aec3/subtractor_output.h"
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#include "modules/audio_processing/logging/apm_data_dumper.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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// Proves linear echo cancellation functionality
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class Subtractor {
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public:
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Subtractor(const EchoCanceller3Config& config,
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size_t num_render_channels,
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size_t num_capture_channels,
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ApmDataDumper* data_dumper,
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Aec3Optimization optimization);
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~Subtractor();
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Subtractor(const Subtractor&) = delete;
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Subtractor& operator=(const Subtractor&) = delete;
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// Performs the echo subtraction.
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void Process(const RenderBuffer& render_buffer,
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const std::vector<std::vector<float>>& capture,
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const RenderSignalAnalyzer& render_signal_analyzer,
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const AecState& aec_state,
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rtc::ArrayView<SubtractorOutput> outputs);
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void HandleEchoPathChange(const EchoPathVariability& echo_path_variability);
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// Exits the initial state.
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void ExitInitialState();
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// Returns the block-wise frequency responses for the refined adaptive
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// filters.
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const std::vector<std::vector<std::array<float, kFftLengthBy2Plus1>>>&
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FilterFrequencyResponses() const {
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return refined_frequency_responses_;
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}
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// Returns the estimates of the impulse responses for the refined adaptive
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// filters.
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const std::vector<std::vector<float>>& FilterImpulseResponses() const {
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return refined_impulse_responses_;
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}
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void DumpFilters() {
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data_dumper_->DumpRaw(
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"aec3_subtractor_h_refined",
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rtc::ArrayView<const float>(
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refined_impulse_responses_[0].data(),
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GetTimeDomainLength(
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refined_filters_[0]->max_filter_size_partitions())));
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refined_filters_[0]->DumpFilter("aec3_subtractor_H_refined");
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coarse_filter_[0]->DumpFilter("aec3_subtractor_H_coarse");
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}
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private:
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class FilterMisadjustmentEstimator {
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public:
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FilterMisadjustmentEstimator() = default;
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~FilterMisadjustmentEstimator() = default;
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// Update the misadjustment estimator.
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void Update(const SubtractorOutput& output);
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// GetMisadjustment() Returns a recommended scale for the filter so the
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// prediction error energy gets closer to the energy that is seen at the
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// microphone input.
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float GetMisadjustment() const {
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RTC_DCHECK_GT(inv_misadjustment_, 0.0f);
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// It is not aiming to adjust all the estimated mismatch. Instead,
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// it adjusts half of that estimated mismatch.
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return 2.f / sqrtf(inv_misadjustment_);
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}
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// Returns true if the prediciton error energy is significantly larger
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// than the microphone signal energy and, therefore, an adjustment is
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// recommended.
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bool IsAdjustmentNeeded() const { return inv_misadjustment_ > 10.f; }
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void Reset();
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void Dump(ApmDataDumper* data_dumper) const;
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private:
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const int n_blocks_ = 4;
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int n_blocks_acum_ = 0;
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float e2_acum_ = 0.f;
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float y2_acum_ = 0.f;
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float inv_misadjustment_ = 0.f;
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int overhang_ = 0.f;
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};
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const Aec3Fft fft_;
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ApmDataDumper* data_dumper_;
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const Aec3Optimization optimization_;
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const EchoCanceller3Config config_;
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const size_t num_capture_channels_;
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std::vector<std::unique_ptr<AdaptiveFirFilter>> refined_filters_;
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std::vector<std::unique_ptr<AdaptiveFirFilter>> coarse_filter_;
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std::vector<std::unique_ptr<RefinedFilterUpdateGain>> refined_gains_;
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std::vector<std::unique_ptr<CoarseFilterUpdateGain>> coarse_gains_;
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std::vector<FilterMisadjustmentEstimator> filter_misadjustment_estimators_;
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std::vector<size_t> poor_coarse_filter_counters_;
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std::vector<std::vector<std::array<float, kFftLengthBy2Plus1>>>
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refined_frequency_responses_;
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std::vector<std::vector<float>> refined_impulse_responses_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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