mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-18 08:07:56 +01:00
913cfa76ec
Bug: webrtc:12338 Change-Id: I52eb3b6675c4705e22f51b70799ed6139a3b46bc Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227164 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34686}
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/*
|
|
* 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 <stdint.h>
|
|
|
|
#include "absl/types/optional.h"
|
|
#include "rtc_base/constructor_magic.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 `rtp_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);
|
|
|
|
// Estimates the offset, in milliseconds, between the remote clock and the
|
|
// local one. This is equal to local NTP clock - remote NTP clock.
|
|
absl::optional<int64_t> EstimateRemoteToLocalClockOffsetMs();
|
|
|
|
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_
|