blob: e80593bf9f245125b83467d1760db227d78c96ed [file] [log] [blame]
* 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.
#include <memory>
#include "webrtc/rtc_base/constructormagic.h"
#include "webrtc/system_wrappers/include/rtp_to_ntp_estimator.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 {
explicit RemoteNtpTimeEstimator(Clock* clock);
// 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);
Clock* clock_;
std::unique_ptr<TimestampExtrapolator> ts_extrapolator_;
RtpToNtpEstimator rtp_to_ntp_;
int64_t last_timing_log_ms_;
} // namespace webrtc