bcec8b0b21
This is from the upstream library commit id 3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium 88.0.4290.1.
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
/*
|
|
* Copyright (c) 2016 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/agc2/noise_spectrum_estimator.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include <algorithm>
|
|
|
|
#include "api/array_view.h"
|
|
#include "modules/audio_processing/logging/apm_data_dumper.h"
|
|
#include "rtc_base/arraysize.h"
|
|
#include "rtc_base/checks.h"
|
|
|
|
namespace webrtc {
|
|
namespace {
|
|
constexpr float kMinNoisePower = 100.f;
|
|
} // namespace
|
|
|
|
NoiseSpectrumEstimator::NoiseSpectrumEstimator(ApmDataDumper* data_dumper)
|
|
: data_dumper_(data_dumper) {
|
|
Initialize();
|
|
}
|
|
|
|
void NoiseSpectrumEstimator::Initialize() {
|
|
std::fill(noise_spectrum_, noise_spectrum_ + arraysize(noise_spectrum_),
|
|
kMinNoisePower);
|
|
}
|
|
|
|
void NoiseSpectrumEstimator::Update(rtc::ArrayView<const float> spectrum,
|
|
bool first_update) {
|
|
RTC_DCHECK_EQ(65, spectrum.size());
|
|
|
|
if (first_update) {
|
|
// Initialize the noise spectral estimate with the signal spectrum.
|
|
std::copy(spectrum.data(), spectrum.data() + spectrum.size(),
|
|
noise_spectrum_);
|
|
} else {
|
|
// Smoothly update the noise spectral estimate towards the signal spectrum
|
|
// such that the magnitude of the updates are limited.
|
|
for (size_t k = 0; k < spectrum.size(); ++k) {
|
|
if (noise_spectrum_[k] < spectrum[k]) {
|
|
noise_spectrum_[k] = std::min(
|
|
1.01f * noise_spectrum_[k],
|
|
noise_spectrum_[k] + 0.05f * (spectrum[k] - noise_spectrum_[k]));
|
|
} else {
|
|
noise_spectrum_[k] = std::max(
|
|
0.99f * noise_spectrum_[k],
|
|
noise_spectrum_[k] + 0.05f * (spectrum[k] - noise_spectrum_[k]));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Ensure that the noise spectal estimate does not become too low.
|
|
for (auto& v : noise_spectrum_) {
|
|
v = std::max(v, kMinNoisePower);
|
|
}
|
|
|
|
data_dumper_->DumpRaw("lc_noise_spectrum", 65, noise_spectrum_);
|
|
data_dumper_->DumpRaw("lc_signal_spectrum", spectrum);
|
|
}
|
|
|
|
} // namespace webrtc
|