1 /*
2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
3  *
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.
9  */
10 
11 #ifndef SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
12 #define SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
13 
14 #include <list>
15 
16 #include "webrtc/typedefs.h"
17 
18 namespace webrtc {
19 
20 struct RtcpMeasurement {
21   RtcpMeasurement();
22   RtcpMeasurement(uint32_t ntp_secs, uint32_t ntp_frac, uint32_t timestamp);
23   uint32_t ntp_secs;
24   uint32_t ntp_frac;
25   uint32_t rtp_timestamp;
26 };
27 
28 typedef std::list<RtcpMeasurement> RtcpList;
29 
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,
34                     uint32_t ntp_frac,
35                     uint32_t rtp_timestamp,
36                     RtcpList* rtcp_list,
37                     bool* new_rtcp_sr);
38 
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);
43 
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);
47 
48 }  // namespace webrtc
49 
50 #endif  // SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
51