Make class of static functions in rtp_to_ntp.h:

webrtc/system_wrappers/include/rtp_to_ntp.h

-/*
- *  Copyright (c) 2012 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 SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
-#define SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_
-
-#include <list>
-
-#include "webrtc/system_wrappers/include/ntp_time.h"
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-struct RtcpMeasurement {
-  RtcpMeasurement();
-  RtcpMeasurement(uint32_t ntp_secs, uint32_t ntp_frac, uint32_t timestamp);
-  bool IsEqual(const RtcpMeasurement& other) const;
-
-  NtpTime ntp_time;
-  uint32_t rtp_timestamp;
-};
-
-struct RtcpMeasurements {
-  RtcpMeasurements();
-  ~RtcpMeasurements();
-  bool Contains(const RtcpMeasurement& other) const;
-  bool IsValid(const RtcpMeasurement& other) const;
-  void UpdateParameters();
-
-  // Estimated parameters from RTP and NTP timestamp pairs in |list|.
-  struct RtpToNtpParameters {
-    double frequency_khz = 0.0;
-    double offset_ms = 0.0;
-    bool calculated = false;
-  };
-
-  std::list<RtcpMeasurement> list;
-  RtpToNtpParameters params;
-};
-
-// Updates |list| in |rtcp_measurements| with timestamps from the RTCP SR.
-// |new_rtcp_sr| will be set to true if these are the timestamps which have
-// never be added to |list|.
-// |rtcp_measurements.params| are estimated from the RTP and NTP timestamp pairs
-// in the |list| when a new RTCP SR is inserted.
-bool UpdateRtcpList(uint32_t ntp_secs,
-                    uint32_t ntp_frac,
-                    uint32_t rtp_timestamp,
-                    RtcpMeasurements* rtcp_measurements,
-                    bool* new_rtcp_sr);
-
-// Converts an RTP timestamp to the NTP domain in milliseconds using the
-// estimated |rtcp_measurements.params|.
-bool RtpToNtpMs(int64_t rtp_timestamp,
-                const RtcpMeasurements& rtcp_measurements,
-                int64_t* rtp_timestamp_in_ms);
-
-// Returns 1 there has been a forward wrap around, 0 if there has been no wrap
-// around and -1 if there has been a backwards wrap around (i.e. reordering).
-int CheckForWrapArounds(uint32_t rtp_timestamp, uint32_t rtcp_rtp_timestamp);
-
-}  // namespace webrtc
-
-#endif  // SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_H_