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Side by Side Diff: webrtc/modules/audio_processing/echo_detector/moving_max.cc

Issue 2629563003: Added a new echo likelihood stat that reports the maximum value from a previous time period. (Closed)
Patch Set: Small bugfix. Created 3 years, 11 months ago
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1 /*
2 * Copyright (c) 2017 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/echo_detector/moving_max.h"
12
13 #include "webrtc/base/checks.h"
14
15 namespace webrtc {
16 namespace {
17
18 // Parameter for controlling how fast the estimated maximum decays after the
19 // previous maximum is no longer valid. With a value of 0.99, the maximum will
20 // decay to 1% of its former value after 460 updates.
21 constexpr float kDecayFactor = 0.99f;
22
23 } // namespace
24
25 MovingMax::MovingMax(size_t window_size) : window_size_(window_size) {
26 RTC_DCHECK_GT(window_size, 0);
27 }
28
29 MovingMax::~MovingMax() {}
30
31 void MovingMax::Update(float value) {
32 if (counter_ >= window_size_ - 1) {
33 max_value_ *= kDecayFactor;
34 } else {
35 ++counter_;
36 }
37 if (value > max_value_) {
38 max_value_ = value;
39 counter_ = 0;
40 }
41 }
42
43 float MovingMax::max() const {
44 return max_value_;
45 }
46
47 void MovingMax::Clear() {
48 max_value_ = 0.f;
49 counter_ = 0;
50 }
51
52 } // namespace webrtc
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