1d68089f4b
This CL increases the transparency of the AEC3 via tuning. The major changes are 1) Limiting the suppression gain to the 16 bit sample floor. 2) Controlling the rate of the suppression gain increase according to the signal characteristics. Apart from these tunings, the code for the suppression gain was refactored to increase/maintain the code quality after the above changes. BUG=webrtc:7519,webrtc:7528, chromium:715893 Review-Url: https://codereview.webrtc.org/2886733002 Cr-Commit-Position: refs/heads/master@{#18229}
64 lines
2.3 KiB
C++
64 lines
2.3 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 WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_
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#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_
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#include <array>
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#include <vector>
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/modules/audio_processing/aec3/aec3_common.h"
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namespace webrtc {
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class SuppressionGain {
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public:
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explicit SuppressionGain(Aec3Optimization optimization);
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void GetGain(const std::array<float, kFftLengthBy2Plus1>& nearend,
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const std::array<float, kFftLengthBy2Plus1>& echo,
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const std::array<float, kFftLengthBy2Plus1>& comfort_noise,
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bool saturated_echo,
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const std::vector<std::vector<float>>& render,
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bool force_zero_gain,
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float* high_bands_gain,
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std::array<float, kFftLengthBy2Plus1>* low_band_gain);
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private:
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void LowerBandGain(bool stationary_with_low_power,
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bool saturated_echo,
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const std::array<float, kFftLengthBy2Plus1>& nearend,
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const std::array<float, kFftLengthBy2Plus1>& echo,
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const std::array<float, kFftLengthBy2Plus1>& comfort_noise,
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std::array<float, kFftLengthBy2Plus1>* gain);
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class LowNoiseRenderDetector {
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public:
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bool Detect(const std::vector<std::vector<float>>& render);
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private:
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float average_power_ = 32768.f * 32768.f;
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};
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const Aec3Optimization optimization_;
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std::array<float, kFftLengthBy2Plus1> last_gain_;
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std::array<float, kFftLengthBy2Plus1> last_masker_;
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std::array<float, kFftLengthBy2Plus1> gain_increase_;
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std::array<float, kFftLengthBy2Plus1> last_echo_;
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LowNoiseRenderDetector low_render_detector_;
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size_t no_saturation_counter_ = 0;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SuppressionGain);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_
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