86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
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/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CLOCK_H_
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#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CLOCK_H_
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#include <memory>
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#include "webrtc/system_wrappers/include/rw_lock_wrapper.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// January 1970, in NTP seconds.
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const uint32_t kNtpJan1970 = 2208988800UL;
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// Magic NTP fractional unit.
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const double kMagicNtpFractionalUnit = 4.294967296E+9;
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// A clock interface that allows reading of absolute and relative timestamps.
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class Clock {
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public:
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virtual ~Clock() {}
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// Return a timestamp in milliseconds relative to some arbitrary source; the
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// source is fixed for this clock.
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virtual int64_t TimeInMilliseconds() const = 0;
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// Return a timestamp in microseconds relative to some arbitrary source; the
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// source is fixed for this clock.
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virtual int64_t TimeInMicroseconds() const = 0;
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// Retrieve an NTP absolute timestamp in seconds and fractions of a second.
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virtual void CurrentNtp(uint32_t& seconds, uint32_t& fractions) const = 0;
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// Retrieve an NTP absolute timestamp in milliseconds.
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virtual int64_t CurrentNtpInMilliseconds() const = 0;
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// Converts an NTP timestamp to a millisecond timestamp.
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static int64_t NtpToMs(uint32_t seconds, uint32_t fractions);
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// Returns an instance of the real-time system clock implementation.
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static Clock* GetRealTimeClock();
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};
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class SimulatedClock : public Clock {
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public:
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explicit SimulatedClock(int64_t initial_time_us);
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~SimulatedClock() override;
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// Return a timestamp in milliseconds relative to some arbitrary source; the
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// source is fixed for this clock.
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int64_t TimeInMilliseconds() const override;
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// Return a timestamp in microseconds relative to some arbitrary source; the
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// source is fixed for this clock.
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int64_t TimeInMicroseconds() const override;
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// Retrieve an NTP absolute timestamp in milliseconds.
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void CurrentNtp(uint32_t& seconds, uint32_t& fractions) const override;
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// Converts an NTP timestamp to a millisecond timestamp.
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int64_t CurrentNtpInMilliseconds() const override;
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// Advance the simulated clock with a given number of milliseconds or
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// microseconds.
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void AdvanceTimeMilliseconds(int64_t milliseconds);
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void AdvanceTimeMicroseconds(int64_t microseconds);
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private:
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int64_t time_us_;
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std::unique_ptr<RWLockWrapper> lock_;
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};
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}; // namespace webrtc
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#endif // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CLOCK_H_
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