21dc1890f4
CurrentNtp return time by taking two output parameters by reference (also breaks style guide) CurrentNtpTime treat ntp time as single entity and returns it using NtpTime structure. (making interface clearer) BUG=None Review-Url: https://codereview.webrtc.org/2733823002 Cr-Commit-Position: refs/heads/master@{#17088}
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/*
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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/ntp_time.h"
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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.
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virtual NtpTime CurrentNtpTime() 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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return NtpTime(seconds, fractions).ToMs();
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}
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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.
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NtpTime CurrentNtpTime() 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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