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39f491eb4e
This CL moves the AEC3 API call skew estimator into a separate file. This has the advantage that it can more easily be tested. The CL also simplifies the code and adds unittests. Bug: webrtc:8671 Change-Id: I19bc31ca5666cdc87a1ed14770ef20ead1b5b80d Reviewed-on: https://webrtc-review.googlesource.com/55860 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22144}
46 lines
1.3 KiB
C++
46 lines
1.3 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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#include "modules/audio_processing/aec3/skew_estimator.h"
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#include <algorithm>
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#include <numeric>
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namespace webrtc {
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SkewEstimator::SkewEstimator(size_t skew_history_size_log2)
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: skew_history_size_log2_(static_cast<int>(skew_history_size_log2)),
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skew_history_(1ULL << skew_history_size_log2_, 0) {}
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SkewEstimator::~SkewEstimator() = default;
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void SkewEstimator::Reset() {
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skew_ = 0;
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skew_sum_ = 0;
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next_index_ = 0;
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sufficient_skew_stored_ = false;
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std::fill(skew_history_.begin(), skew_history_.end(), 0);
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}
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rtc::Optional<int> SkewEstimator::GetSkewFromCapture() {
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--skew_;
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skew_sum_ += skew_ - skew_history_[next_index_];
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skew_history_[next_index_] = skew_;
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if (++next_index_ == skew_history_.size()) {
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next_index_ = 0;
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sufficient_skew_stored_ = true;
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}
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return sufficient_skew_stored_
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? rtc::Optional<int>(skew_sum_ >> skew_history_size_log2_)
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: rtc::nullopt;
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}
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} // namespace webrtc
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