Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/system_wrappers/interface/clock.h

@@ -0,0 +1,85 @@
+/*
+ *  Copyright (c) 2013 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 WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CLOCK_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CLOCK_H_
+
+#include "webrtc/system_wrappers/interface/rw_lock_wrapper.h"
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+// January 1970, in NTP seconds.
+const uint32_t kNtpJan1970 = 2208988800UL;
+
+// Magic NTP fractional unit.
+const double kMagicNtpFractionalUnit = 4.294967296E+9;
+
+// A clock interface that allows reading of absolute and relative timestamps.
+class Clock {
+ public:
+  virtual ~Clock() {}
+
+  // Return a timestamp in milliseconds relative to some arbitrary source; the
+  // source is fixed for this clock.
+  virtual int64_t TimeInMilliseconds() const = 0;
+
+  // Return a timestamp in microseconds relative to some arbitrary source; the
+  // source is fixed for this clock.
+  virtual int64_t TimeInMicroseconds() const = 0;
+
+  // Retrieve an NTP absolute timestamp in seconds and fractions of a second.
+  virtual void CurrentNtp(uint32_t& seconds, uint32_t& fractions) const = 0;
+
+  // Retrieve an NTP absolute timestamp in milliseconds.
+  virtual int64_t CurrentNtpInMilliseconds() const = 0;
+
+  // Converts an NTP timestamp to a millisecond timestamp.
+  static int64_t NtpToMs(uint32_t seconds, uint32_t fractions);
+
+  // Returns an instance of the real-time system clock implementation.
+  static Clock* GetRealTimeClock();
+};
+
+class SimulatedClock : public Clock {
+ public:
+  explicit SimulatedClock(int64_t initial_time_us);
+
+  virtual ~SimulatedClock();
+
+  // Return a timestamp in milliseconds relative to some arbitrary source; the
+  // source is fixed for this clock.
+  virtual int64_t TimeInMilliseconds() const OVERRIDE;
+
+  // Return a timestamp in microseconds relative to some arbitrary source; the
+  // source is fixed for this clock.
+  virtual int64_t TimeInMicroseconds() const OVERRIDE;
+
+  // Retrieve an NTP absolute timestamp in milliseconds.
+  virtual void CurrentNtp(uint32_t& seconds,
+                          uint32_t& fractions) const OVERRIDE;
+
+  // Converts an NTP timestamp to a millisecond timestamp.
+  virtual int64_t CurrentNtpInMilliseconds() const OVERRIDE;
+
+  // Advance the simulated clock with a given number of milliseconds or
+  // microseconds.
+  void AdvanceTimeMilliseconds(int64_t milliseconds);
+  void AdvanceTimeMicroseconds(int64_t microseconds);
+
+ private:
+  int64_t time_us_;
+  scoped_ptr<RWLockWrapper> lock_;
+};
+
+};  // namespace webrtc
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CLOCK_H_