timestamp_extrapolator.h

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/*

 *  Copyright (c) 2011 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_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_

#define MODULES_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_

#include <stdint.h>

#include "absl/types/optional.h"

#include "api/units/timestamp.h"

#include "rtc_base/numerics/sequence_number_unwrapper.h"

namespace webrtc {

// Not thread safe.

class TimestampExtrapolator {

 public:

  explicit TimestampExtrapolator(Timestamp start);

  void Update(Timestamp now, uint32_t ts90khz);

  absl::optional<Timestamp> ExtrapolateLocalTime(uint32_t timestamp90khz) const;

  void Reset(Timestamp start);

 private:

  void CheckForWrapArounds(uint32_t ts90khz);

  bool DelayChangeDetection(double error);

  double w_[2];

  double p_[2][2];

  Timestamp start_;

  Timestamp prev_;

  absl::optional<int64_t> first_unwrapped_timestamp_;

  RtpTimestampUnwrapper unwrapper_;

  absl::optional<int64_t> prev_unwrapped_timestamp_;

  uint32_t packet_count_;

  double detector_accumulator_pos_;

  double detector_accumulator_neg_;

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_