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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 <optional>
#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);
~TimestampExtrapolator();
void Update(Timestamp now, uint32_t ts90khz);
std::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_;
std::optional<int64_t> first_unwrapped_timestamp_;
RtpTimestampUnwrapper unwrapper_;
std::optional<int64_t> prev_unwrapped_timestamp_;
int packet_count_;
double detector_accumulator_pos_;
double detector_accumulator_neg_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_
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