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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 WEBRTC_MODULES_RTP_RTCP_INTERFACE_REMOTE_NTP_TIME_ESTIMATOR_H_
#define WEBRTC_MODULES_RTP_RTCP_INTERFACE_REMOTE_NTP_TIME_ESTIMATOR_H_
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/system_wrappers/include/rtp_to_ntp.h"
namespace webrtc {
class Clock;
class TimestampExtrapolator;
// 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_;
rtc::scoped_ptr<TimestampExtrapolator> ts_extrapolator_;
RtcpList rtcp_list_;
int64_t last_timing_log_ms_;
RTC_DISALLOW_COPY_AND_ASSIGN(RemoteNtpTimeEstimator);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_RTP_RTCP_INTERFACE_REMOTE_NTP_TIME_ESTIMATOR_H_
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