1 files changed, 50 insertions, 0 deletions
diff --git a/webrtc/system_wrappers/include/rtp_to_ntp.h b/webrtc/system_wrappers/include/rtp_to_ntp.h
new file mode 100644
index 0000000000..dfc25cd9e9
--- /dev/null
+++ b/webrtc/system_wrappers/include/rtp_to_ntp.h
@@ -0,0 +1,50 @@
+/*
+ *  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_INTERFACE_RTP_TO_NTP_H_
+#define SYSTEM_WRAPPERS_INTERFACE_RTP_TO_NTP_H_
+
+#include <list>
+
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+struct RtcpMeasurement {
+  RtcpMeasurement();
+  RtcpMeasurement(uint32_t ntp_secs, uint32_t ntp_frac, uint32_t timestamp);
+  uint32_t ntp_secs;
+  uint32_t ntp_frac;
+  uint32_t rtp_timestamp;
+};
+
+typedef std::list<RtcpMeasurement> RtcpList;
+
+// Updates |rtcp_list| with timestamps from the latest RTCP SR.
+// |new_rtcp_sr| will be set to true if these are the timestamps which have
+// never be added to |rtcp_list|.
+bool UpdateRtcpList(uint32_t ntp_secs,
+                    uint32_t ntp_frac,
+                    uint32_t rtp_timestamp,
+                    RtcpList* rtcp_list,
+                    bool* new_rtcp_sr);
+
+// Converts an RTP timestamp to the NTP domain in milliseconds using two
+// (RTP timestamp, NTP timestamp) pairs.
+bool RtpToNtpMs(int64_t rtp_timestamp, const RtcpList& rtcp,
+                int64_t* 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_INTERFACE_RTP_TO_NTP_H_