Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/system_wrappers/interface/timestamp_extrapolator.h

@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2011 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_TIMESTAMP_EXTRAPOLATOR_H_
+#define SYSTEM_WRAPPERS_INTERFACE_TIMESTAMP_EXTRAPOLATOR_H_
+
+#include "webrtc/system_wrappers/interface/rw_lock_wrapper.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc
+{
+
+class TimestampExtrapolator
+{
+public:
+    explicit TimestampExtrapolator(int64_t start_ms);
+    ~TimestampExtrapolator();
+    void Update(int64_t tMs, uint32_t ts90khz);
+    int64_t ExtrapolateLocalTime(uint32_t timestamp90khz);
+    void Reset(int64_t start_ms);
+
+private:
+    void CheckForWrapArounds(uint32_t ts90khz);
+    bool DelayChangeDetection(double error);
+    RWLockWrapper*        _rwLock;
+    double                _w[2];
+    double                _P[2][2];
+    int64_t         _startMs;
+    int64_t         _prevMs;
+    uint32_t        _firstTimestamp;
+    int32_t         _wrapArounds;
+    int64_t         _prevUnwrappedTimestamp;
+    int64_t         _prevWrapTimestamp;
+    const double          _lambda;
+    bool                  _firstAfterReset;
+    uint32_t        _packetCount;
+    const uint32_t  _startUpFilterDelayInPackets;
+
+    double              _detectorAccumulatorPos;
+    double              _detectorAccumulatorNeg;
+    const double        _alarmThreshold;
+    const double        _accDrift;
+    const double        _accMaxError;
+    const double        _P11;
+};
+
+}  // namespace webrtc
+
+#endif // SYSTEM_WRAPPERS_INTERFACE_TIMESTAMP_EXTRAPOLATOR_H_