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Side by Side Diff: webrtc/modules/audio_processing/level_controller/noise_spectrum_estimator.cc

Issue 2090583002: New module for the adaptive level controlling functionality in the audio processing module (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: Corrected an assignment error Created 4 years, 5 months ago
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1 /*
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "webrtc/modules/audio_processing/level_controller/noise_spectrum_estima tor.h"
12
13 #include <string.h>
14 #include <algorithm>
15
16 #include "webrtc/base/array_view.h"
17 #include "webrtc/base/arraysize.h"
18 #include "webrtc/modules/audio_processing/logging/apm_data_dumper.h"
19
20 namespace webrtc {
21 namespace {
22 float kMinNoisePower = 100.f;
23 } // namespace
24
25 NoiseSpectrumEstimator::NoiseSpectrumEstimator(ApmDataDumper* data_dumper)
26 : data_dumper_(data_dumper) {
27 Initialize();
28 }
29
30 void NoiseSpectrumEstimator::Initialize() {
31 std::fill(noise_spectrum_, noise_spectrum_ + arraysize(noise_spectrum_),
32 kMinNoisePower);
33 }
34
35 void NoiseSpectrumEstimator::Update(rtc::ArrayView<const float> spectrum,
36 bool first_update) {
37 RTC_DCHECK_EQ(65u, spectrum.size());
38
39 if (first_update) {
40 // Initialize the noise spectral estimate with the signal spectrum.
41 std::copy(spectrum.data(), spectrum.data() + spectrum.size(),
42 noise_spectrum_);
43 } else {
44 // Smoothly update the noise spectral estimate towards the signal spectrum
45 // such that the magnitude of the updates are limited.
46 for (size_t k = 0; k < spectrum.size(); ++k) {
47 if (noise_spectrum_[k] < spectrum[k]) {
48 noise_spectrum_[k] = std::min(
49 1.01f * noise_spectrum_[k],
50 noise_spectrum_[k] + 0.05f * (spectrum[k] - noise_spectrum_[k]));
51 } else {
52 noise_spectrum_[k] = std::max(
53 0.99f * noise_spectrum_[k],
54 noise_spectrum_[k] + 0.05f * (spectrum[k] - noise_spectrum_[k]));
55 }
56 }
57 }
58
59 // Ensure that the noise spectal estimate does not become too low.
60 for (auto& v : noise_spectrum_) {
61 v = std::max(v, kMinNoisePower);
62 }
63
64 data_dumper_->DumpRaw("lc_noise_spectrum", 65, noise_spectrum_);
65 data_dumper_->DumpRaw("lc_signal_spectrum", spectrum);
66 }
67
68 } // namespace webrtc
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