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/*
* Copyright (c) 2014 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_RTP_RTCP_INCLUDE_REMOTE_NTP_TIME_ESTIMATOR_H_
#define MODULES_RTP_RTCP_INCLUDE_REMOTE_NTP_TIME_ESTIMATOR_H_
#include <memory>
#include "rtc_base/constructormagic.h"
#include "rtc_base/numerics/moving_median_filter.h"
#include "system_wrappers/include/rtp_to_ntp_estimator.h"
namespace webrtc {
class Clock;
// RemoteNtpTimeEstimator can be used to estimate a given RTP timestamp's NTP
// time in local timebase.
// Note that it needs to be trained with at least 2 RTCP SR (by calling
// |UpdateRtcpTimestamp|) before it can be used.
class RemoteNtpTimeEstimator {
public:
explicit RemoteNtpTimeEstimator(Clock* clock);
~RemoteNtpTimeEstimator();
// Updates the estimator with round trip time |rtt|, NTP seconds |ntp_secs|,
// NTP fraction |ntp_frac| and RTP timestamp |rtcp_timestamp|.
bool UpdateRtcpTimestamp(int64_t rtt,
uint32_t ntp_secs,
uint32_t ntp_frac,
uint32_t rtp_timestamp);
// Estimates the NTP timestamp in local timebase from |rtp_timestamp|.
// Returns the NTP timestamp in ms when success. -1 if failed.
int64_t Estimate(uint32_t rtp_timestamp);
private:
Clock* clock_;
MovingMedianFilter<int64_t> ntp_clocks_offset_estimator_;
RtpToNtpEstimator rtp_to_ntp_;
int64_t last_timing_log_ms_;
RTC_DISALLOW_COPY_AND_ASSIGN(RemoteNtpTimeEstimator);
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_INCLUDE_REMOTE_NTP_TIME_ESTIMATOR_H_