| /* |
| * 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 "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_ |