1 /*
2 * Copyright (c) 2018 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 "modules/audio_processing/aec3/subtractor_output_analyzer.h"
12
13 #include <algorithm>
14
15 #include "modules/audio_processing/aec3/aec3_common.h"
16
17 namespace webrtc {
18
SubtractorOutputAnalyzer(size_t num_capture_channels)19 SubtractorOutputAnalyzer::SubtractorOutputAnalyzer(size_t num_capture_channels)
20 : filters_converged_(num_capture_channels, false) {}
21
Update(rtc::ArrayView<const SubtractorOutput> subtractor_output,bool * any_filter_converged,bool * any_coarse_filter_converged,bool * all_filters_diverged)22 void SubtractorOutputAnalyzer::Update(
23 rtc::ArrayView<const SubtractorOutput> subtractor_output,
24 bool* any_filter_converged,
25 bool* any_coarse_filter_converged,
26 bool* all_filters_diverged) {
27 RTC_DCHECK(any_filter_converged);
28 RTC_DCHECK(all_filters_diverged);
29 RTC_DCHECK_EQ(subtractor_output.size(), filters_converged_.size());
30
31 *any_filter_converged = false;
32 *any_coarse_filter_converged = false;
33 *all_filters_diverged = true;
34
35 for (size_t ch = 0; ch < subtractor_output.size(); ++ch) {
36 const float y2 = subtractor_output[ch].y2;
37 const float e2_refined = subtractor_output[ch].e2_refined;
38 const float e2_coarse = subtractor_output[ch].e2_coarse;
39
40 constexpr float kConvergenceThreshold = 50 * 50 * kBlockSize;
41 constexpr float kConvergenceThresholdLowLevel = 20 * 20 * kBlockSize;
42 bool refined_filter_converged =
43 e2_refined < 0.5f * y2 && y2 > kConvergenceThreshold;
44 bool coarse_filter_converged_strict =
45 e2_coarse < 0.05f * y2 && y2 > kConvergenceThreshold;
46 bool coarse_filter_converged_relaxed =
47 e2_coarse < 0.2f * y2 && y2 > kConvergenceThresholdLowLevel;
48 float min_e2 = std::min(e2_refined, e2_coarse);
49 bool filter_diverged = min_e2 > 1.5f * y2 && y2 > 30.f * 30.f * kBlockSize;
50 filters_converged_[ch] =
51 refined_filter_converged || coarse_filter_converged_strict;
52
53 *any_filter_converged = *any_filter_converged || filters_converged_[ch];
54 *any_coarse_filter_converged =
55 *any_coarse_filter_converged || coarse_filter_converged_relaxed;
56 *all_filters_diverged = *all_filters_diverged && filter_diverged;
57 }
58 }
59
HandleEchoPathChange()60 void SubtractorOutputAnalyzer::HandleEchoPathChange() {
61 std::fill(filters_converged_.begin(), filters_converged_.end(), false);
62 }
63
64 } // namespace webrtc
65