70b775d77f
Code style improvements done in preparation for a bug fix (TODO added) which requires changes in the unit tests. Note that one expected value in the unit tests has been adjusted since the white noise generator is now instanced in each separate test and therefore, even if the seed remained the same, the generated sequences differ. Bug: webrtc:7494 Change-Id: I497513b84f50b5c66cf6241a09946ce853eb1cd2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214122 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33636}
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/*
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* Copyright (c) 2016 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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#include "modules/audio_processing/agc2/noise_spectrum_estimator.h"
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#include <string.h>
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#include <algorithm>
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#include "api/array_view.h"
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#include "modules/audio_processing/logging/apm_data_dumper.h"
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#include "rtc_base/arraysize.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace {
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constexpr float kMinNoisePower = 100.f;
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} // namespace
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NoiseSpectrumEstimator::NoiseSpectrumEstimator(ApmDataDumper* data_dumper)
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: data_dumper_(data_dumper) {
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Initialize();
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}
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void NoiseSpectrumEstimator::Initialize() {
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std::fill(noise_spectrum_, noise_spectrum_ + arraysize(noise_spectrum_),
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kMinNoisePower);
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}
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void NoiseSpectrumEstimator::Update(rtc::ArrayView<const float> spectrum,
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bool first_update) {
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RTC_DCHECK_EQ(65, spectrum.size());
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if (first_update) {
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// Initialize the noise spectral estimate with the signal spectrum.
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std::copy(spectrum.data(), spectrum.data() + spectrum.size(),
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noise_spectrum_);
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} else {
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// Smoothly update the noise spectral estimate towards the signal spectrum
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// such that the magnitude of the updates are limited.
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for (size_t k = 0; k < spectrum.size(); ++k) {
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if (noise_spectrum_[k] < spectrum[k]) {
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noise_spectrum_[k] = std::min(
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1.01f * noise_spectrum_[k],
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noise_spectrum_[k] + 0.05f * (spectrum[k] - noise_spectrum_[k]));
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} else {
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noise_spectrum_[k] = std::max(
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0.99f * noise_spectrum_[k],
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noise_spectrum_[k] + 0.05f * (spectrum[k] - noise_spectrum_[k]));
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}
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}
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}
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// Ensure that the noise spectal estimate does not become too low.
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for (auto& v : noise_spectrum_) {
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v = std::max(v, kMinNoisePower);
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}
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data_dumper_->DumpRaw("agc2_noise_spectrum", 65, noise_spectrum_);
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data_dumper_->DumpRaw("agc2_signal_spectrum", spectrum);
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}
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} // namespace webrtc
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