2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #ifndef SYSTEM_WRAPPERS_INTERFACE_RTP_TO_NTP_H_
12 #define SYSTEM_WRAPPERS_INTERFACE_RTP_TO_NTP_H_
16 #include "webrtc/typedefs.h"
20 struct RtcpMeasurement {
22 RtcpMeasurement(uint32_t ntp_secs, uint32_t ntp_frac, uint32_t timestamp);
25 uint32_t rtp_timestamp;
28 typedef std::list<RtcpMeasurement> RtcpList;
30 // Updates |rtcp_list| with timestamps from the latest RTCP SR.
31 // |new_rtcp_sr| will be set to true if these are the timestamps which have
32 // never be added to |rtcp_list|.
33 bool UpdateRtcpList(uint32_t ntp_secs,
35 uint32_t rtp_timestamp,
39 // Converts an RTP timestamp to the NTP domain in milliseconds using two
40 // (RTP timestamp, NTP timestamp) pairs.
41 bool RtpToNtpMs(int64_t rtp_timestamp, const RtcpList& rtcp,
42 int64_t* timestamp_in_ms);
44 // Returns 1 there has been a forward wrap around, 0 if there has been no wrap
45 // around and -1 if there has been a backwards wrap around (i.e. reordering).
46 int CheckForWrapArounds(uint32_t rtp_timestamp, uint32_t rtcp_rtp_timestamp);
50 #endif // SYSTEM_WRAPPERS_INTERFACE_RTP_TO_NTP_H_