File: clockdrift_detector.h

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/*
 *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_

#include <stddef.h>

#include <array>

namespace webrtc {

class ApmDataDumper;
struct DownsampledRenderBuffer;
struct EchoCanceller3Config;

// Detects clockdrift by analyzing the estimated delay.
class ClockdriftDetector {
 public:
  enum class Level { kNone, kProbable, kVerified, kNumCategories };
  ClockdriftDetector();
  ~ClockdriftDetector();
  void Update(int delay_estimate);
  Level ClockdriftLevel() const { return level_; }

 private:
  std::array<int, 3> delay_history_;
  Level level_;
  size_t stability_counter_;
};
}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_