b7e7b49551
BUG=webrtc:6579 Review-Url: https://codereview.webrtc.org/2435053004 Cr-Commit-Position: refs/heads/master@{#15125}
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
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#define SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
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#include <list>
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#include "webrtc/system_wrappers/include/ntp_time.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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struct RtcpMeasurement {
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RtcpMeasurement();
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RtcpMeasurement(uint32_t ntp_secs, uint32_t ntp_frac, uint32_t timestamp);
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bool IsEqual(const RtcpMeasurement& other) const;
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NtpTime ntp_time;
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uint32_t rtp_timestamp;
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};
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struct RtcpMeasurements {
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RtcpMeasurements();
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~RtcpMeasurements();
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bool Contains(const RtcpMeasurement& other) const;
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bool IsValid(const RtcpMeasurement& other) const;
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void UpdateParameters();
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// Estimated parameters from RTP and NTP timestamp pairs in |list|.
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struct RtpToNtpParameters {
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double frequency_khz = 0.0;
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double offset_ms = 0.0;
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bool calculated = false;
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};
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std::list<RtcpMeasurement> list;
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RtpToNtpParameters params;
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};
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// Updates |list| in |rtcp_measurements| with timestamps from the RTCP SR.
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// |new_rtcp_sr| will be set to true if these are the timestamps which have
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// never be added to |list|.
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// |rtcp_measurements.params| are estimated from the RTP and NTP timestamp pairs
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// in the |list| when a new RTCP SR is inserted.
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bool UpdateRtcpList(uint32_t ntp_secs,
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uint32_t ntp_frac,
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uint32_t rtp_timestamp,
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RtcpMeasurements* rtcp_measurements,
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bool* new_rtcp_sr);
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// Converts an RTP timestamp to the NTP domain in milliseconds using the
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// estimated |rtcp_measurements.params|.
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bool RtpToNtpMs(int64_t rtp_timestamp,
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const RtcpMeasurements& rtcp_measurements,
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int64_t* rtp_timestamp_in_ms);
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// Returns 1 there has been a forward wrap around, 0 if there has been no wrap
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// around and -1 if there has been a backwards wrap around (i.e. reordering).
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int CheckForWrapArounds(uint32_t rtp_timestamp, uint32_t rtcp_rtp_timestamp);
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} // namespace webrtc
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#endif // SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
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