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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/*
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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_SKEW_ESTIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_SKEW_ESTIMATOR_H_
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#include <stddef.h>
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#include <vector>
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#include "absl/types/optional.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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// Estimator of API call skew between render and capture.
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class SkewEstimator {
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public:
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explicit SkewEstimator(size_t skew_history_size_log2);
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~SkewEstimator();
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// Resets the estimation.
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void Reset();
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// Updates the skew data for a render call.
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void LogRenderCall() { ++skew_; }
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// Updates and computes the skew at a capture call. Returns an optional which
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// is non-null if a reliable skew has been found.
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absl::optional<int> GetSkewFromCapture();
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private:
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const int skew_history_size_log2_;
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std::vector<float> skew_history_;
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int skew_ = 0;
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int skew_sum_ = 0;
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size_t next_index_ = 0;
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bool sufficient_skew_stored_ = false;
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RTC_DISALLOW_COPY_AND_ASSIGN(SkewEstimator);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_SKEW_ESTIMATOR_H_
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