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This change introduces a clockdrift detector operating on the estimated delay of the echo path delay estimator. Each time the delay estimate changes it is compared to previous estimates. If the estimates are slowly increasing or decreasing, clockdrift is detected. Four different patterns are considered clockdrift: - k, k+1, k+2, k+3 - k, k+2, k+1, k+3 - k, k-1, k-2, k-3 - k, k-2, k-1, k-3 A delay estimate history matching the three last elements in one of the patterns is considered probable clockdrift. Matching all four elements is considered verified clockdrift. If the delay is constant for some time after clockdrift is detected the clockdrift detector will revert to no detected clockdrift. The level of clockdrift is reported via an UMA histogram. Bug: webrtc:10014 Change-Id: I1cce4d593e101a8b3fa99df6935e59b4243cb97a Reviewed-on: https://webrtc-review.googlesource.com/c/111381 Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25758}
38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_
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#include <array>
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namespace webrtc {
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class ApmDataDumper;
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struct DownsampledRenderBuffer;
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struct EchoCanceller3Config;
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// Detects clockdrift by analyzing the estimated delay.
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class ClockdriftDetector {
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public:
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enum class Level { kNone, kProbable, kVerified, kNumCategories };
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ClockdriftDetector();
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~ClockdriftDetector();
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void Update(int delay_estimate);
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Level ClockdriftLevel() const { return level_; }
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private:
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std::array<int, 3> delay_history_;
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Level level_;
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size_t stability_counter_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_
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