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Side by Side Diff: webrtc/modules/audio_processing/level_controller/saturating_gain_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 the initial behavior for the peak level estimate, and ensured a nonzero minimum peak leveā€¦ Created 4 years, 6 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/saturating_gain_estim ator.h"
12
13 #include <math.h>
14 #include <algorithm>
15
16 #include "webrtc/modules/audio_processing/level_controller/lc_constants.h"
17 #include "webrtc/modules/audio_processing/logging/apm_data_dumper.h"
18
19 namespace webrtc {
20
21 SaturatingGainEstimator::SaturatingGainEstimator() {
22 Initialize();
23 }
24
25 SaturatingGainEstimator::~SaturatingGainEstimator() {}
26
27 void SaturatingGainEstimator::Initialize() {
28 saturating_gain_ = 1000.f;
29 saturating_gain_hold_counter_ = 0;
30 }
31
32 void SaturatingGainEstimator::Update(float gain, int num_saturations) {
33 bool too_many_saturations = (num_saturations > 2);
34
35 if (too_many_saturations) {
36 saturating_gain_ = 0.95f * gain;
37 saturating_gain_hold_counter_ = 1000;
38 } else {
39 saturating_gain_hold_counter_ =
40 std::max(0, saturating_gain_hold_counter_ - 1);
41 if (saturating_gain_hold_counter_ == 0) {
42 saturating_gain_ *= 1.001f;
43 saturating_gain_ = std::min(kMaxLcGain, saturating_gain_);
44 }
45 }
46 }
47
48 } // namespace webrtc
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