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417 lines
10 KiB
C++
417 lines
10 KiB
C++
/*
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This file is a part of JRTPLIB
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Copyright (c) 1999-2017 Jori Liesenborgs
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Contact: jori.liesenborgs@gmail.com
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This library was developed at the Expertise Centre for Digital Media
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(http://www.edm.uhasselt.be), a research center of the Hasselt University
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(http://www.uhasselt.be). The library is based upon work done for
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my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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/**
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* \file rtptimeutilities.h
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*/
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#ifndef RTPTIMEUTILITIES_H
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#define RTPTIMEUTILITIES_H
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#include "rtpconfig.h"
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#include "rtptypes.h"
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#ifndef RTP_HAVE_QUERYPERFORMANCECOUNTER
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#include <sys/time.h>
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#include <time.h>
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#include <errno.h>
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#else
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#include "Windows.h"
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#endif // RTP_HAVE_QUERYPERFORMANCECOUNTER
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#include "export.h"
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#define RTP_NTPTIMEOFFSET 2208988800UL
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#ifdef RTP_HAVE_VSUINT64SUFFIX
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#define C1000000 1000000ui64
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#define CEPOCH 11644473600000000ui64
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#else
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#define C1000000 1000000ULL
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#define CEPOCH 11644473600000000ULL
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#endif // RTP_HAVE_VSUINT64SUFFIX
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namespace qrtplib
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{
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/**
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* This is a simple wrapper for the most significant word (MSW) and least
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* significant word (LSW) of an NTP timestamp.
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*/
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class QRTPLIB_API RTPNTPTime
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{
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public:
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/** This constructor creates and instance with MSW \c m and LSW \c l. */
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RTPNTPTime(uint32_t m, uint32_t l)
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{
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msw = m;
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lsw = l;
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}
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/** Returns the most significant word. */
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uint32_t GetMSW() const
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{
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return msw;
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}
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/** Returns the least significant word. */
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uint32_t GetLSW() const
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{
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return lsw;
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}
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private:
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uint32_t msw, lsw;
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};
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/** This class is used to specify wallclock time, delay intervals etc.
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* This class is used to specify wallclock time, delay intervals etc.
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* It stores a number of seconds and a number of microseconds.
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*/
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class QRTPLIB_API RTPTime
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{
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public:
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/** Returns an RTPTime instance representing the current wallclock time.
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* Returns an RTPTime instance representing the current wallclock time. This is expressed
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* as a number of seconds since 00:00:00 UTC, January 1, 1970.
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*/
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static RTPTime CurrentTime();
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/** This function waits the amount of time specified in \c delay. */
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static void Wait(const RTPTime &delay);
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/** Creates an RTPTime instance representing \c t, which is expressed in units of seconds. */
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RTPTime(double t);
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/** Creates an instance that corresponds to \c ntptime.
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* Creates an instance that corresponds to \c ntptime. If
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* the conversion cannot be made, both the seconds and the
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* microseconds are set to zero.
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*/
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RTPTime(RTPNTPTime ntptime);
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/** Creates an instance corresponding to \c seconds and \c microseconds. */
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RTPTime(int64_t seconds, uint32_t microseconds);
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/** Returns the number of seconds stored in this instance. */
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int64_t GetSeconds() const;
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/** Returns the number of microseconds stored in this instance. */
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uint32_t GetMicroSeconds() const;
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/** Returns the time stored in this instance, expressed in units of seconds. */
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double GetDouble() const
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{
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return m_t;
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}
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/** Returns the NTP time corresponding to the time stored in this instance. */
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RTPNTPTime GetNTPTime() const;
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RTPTime &operator-=(const RTPTime &t);
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RTPTime &operator+=(const RTPTime &t);
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bool operator<(const RTPTime &t) const;
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bool operator>(const RTPTime &t) const;
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bool operator<=(const RTPTime &t) const;
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bool operator>=(const RTPTime &t) const;
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bool IsZero() const
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{
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return m_t == 0.0;
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}
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private:
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#ifdef RTP_HAVE_QUERYPERFORMANCECOUNTER
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static inline uint64_t CalculateMicroseconds(uint64_t performancecount,uint64_t performancefrequency);
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#endif // RTP_HAVE_QUERYPERFORMANCECOUNTER
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double m_t;
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};
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inline RTPTime::RTPTime(double t)
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{
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m_t = t;
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}
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inline RTPTime::RTPTime(int64_t seconds, uint32_t microseconds)
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{
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if (seconds >= 0)
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{
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m_t = (double) seconds + 1e-6 * (double) microseconds;
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}
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else
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{
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int64_t possec = -seconds;
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m_t = (double) possec + 1e-6 * (double) microseconds;
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m_t = -m_t;
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}
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}
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inline RTPTime::RTPTime(RTPNTPTime ntptime)
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{
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if (ntptime.GetMSW() < RTP_NTPTIMEOFFSET)
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{
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m_t = 0;
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}
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else
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{
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uint32_t sec = ntptime.GetMSW() - RTP_NTPTIMEOFFSET;
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double x = (double) ntptime.GetLSW();
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x /= (65536.0 * 65536.0);
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x *= 1000000.0;
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uint32_t microsec = (uint32_t) x;
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m_t = (double) sec + 1e-6 * (double) microsec;
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}
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}
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inline int64_t RTPTime::GetSeconds() const
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{
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return (int64_t) m_t;
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}
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inline uint32_t RTPTime::GetMicroSeconds() const
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{
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uint32_t microsec;
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if (m_t >= 0)
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{
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int64_t sec = (int64_t) m_t;
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microsec = (uint32_t) (1e6 * (m_t - (double) sec) + 0.5);
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}
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else // m_t < 0
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{
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int64_t sec = (int64_t) (-m_t);
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microsec = (uint32_t) (1e6 * ((-m_t) - (double) sec) + 0.5);
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}
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if (microsec >= 1000000)
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return 999999;
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// Unsigned, it can never be less than 0
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// if (microsec < 0)
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// return 0;
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return microsec;
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}
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#ifdef RTP_HAVE_QUERYPERFORMANCECOUNTER
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inline uint64_t RTPTime::CalculateMicroseconds(uint64_t performancecount,uint64_t performancefrequency)
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{
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uint64_t f = performancefrequency;
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uint64_t a = performancecount;
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uint64_t b = a/f;
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uint64_t c = a%f; // a = b*f+c => (a*1000000)/f = b*1000000+(c*1000000)/f
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return b*C1000000+(c*C1000000)/f;
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}
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inline RTPTime RTPTime::CurrentTime()
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{
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static int inited = 0;
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static uint64_t microseconds, initmicroseconds;
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static LARGE_INTEGER performancefrequency;
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uint64_t emulate_microseconds, microdiff;
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SYSTEMTIME systemtime;
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FILETIME filetime;
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LARGE_INTEGER performancecount;
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QueryPerformanceCounter(&performancecount);
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if(!inited)
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{
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inited = 1;
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QueryPerformanceFrequency(&performancefrequency);
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GetSystemTime(&systemtime);
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SystemTimeToFileTime(&systemtime,&filetime);
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microseconds = ( ((uint64_t)(filetime.dwHighDateTime) << 32) + (uint64_t)(filetime.dwLowDateTime) ) / (uint64_t)10;
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microseconds-= CEPOCH; // EPOCH
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initmicroseconds = CalculateMicroseconds(performancecount.QuadPart, performancefrequency.QuadPart);
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}
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emulate_microseconds = CalculateMicroseconds(performancecount.QuadPart, performancefrequency.QuadPart);
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microdiff = emulate_microseconds - initmicroseconds;
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double t = 1e-6*(double)(microseconds + microdiff);
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return RTPTime(t);
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}
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inline void RTPTime::Wait(const RTPTime &delay)
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{
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if (delay.m_t <= 0)
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return;
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uint64_t sec = (uint64_t)delay.m_t;
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uint32_t microsec = (uint32_t)(1e6*(delay.m_t-(double)sec));
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DWORD t = ((DWORD)sec)*1000+(((DWORD)microsec)/1000);
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Sleep(t);
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}
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#else // unix style
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#ifdef RTP_HAVE_CLOCK_GETTIME
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inline double RTPTime_timespecToDouble(struct timespec &ts)
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{
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return (double) ts.tv_sec + 1e-9 * (double) ts.tv_nsec;
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}
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inline RTPTime RTPTime::CurrentTime()
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{
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static bool s_initialized = false;
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static double s_startOffet = 0;
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if (!s_initialized)
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{
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s_initialized = true;
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// Get the corresponding times in system time and monotonic time
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struct timespec tpSys, tpMono;
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clock_gettime(CLOCK_REALTIME, &tpSys);
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clock_gettime(CLOCK_MONOTONIC, &tpMono);
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double tSys = RTPTime_timespecToDouble(tpSys);
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double tMono = RTPTime_timespecToDouble(tpMono);
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s_startOffet = tSys - tMono;
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return tSys;
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}
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struct timespec tpMono;
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clock_gettime(CLOCK_MONOTONIC, &tpMono);
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double tMono0 = RTPTime_timespecToDouble(tpMono);
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return tMono0 + s_startOffet;
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}
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#else // gettimeofday fallback
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inline RTPTime RTPTime::CurrentTime()
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{
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struct timeval tv;
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gettimeofday(&tv,0);
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return RTPTime((uint64_t)tv.tv_sec,(uint32_t)tv.tv_usec);
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}
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#endif // RTP_HAVE_CLOCK_GETTIME
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inline void RTPTime::Wait(const RTPTime &delay)
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{
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if (delay.m_t <= 0)
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return;
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uint64_t sec = (uint64_t) delay.m_t;
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uint64_t nanosec = (uint32_t) (1e9 * (delay.m_t - (double) sec));
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struct timespec req, rem;
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int ret;
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req.tv_sec = (time_t) sec;
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req.tv_nsec = ((long) nanosec);
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do
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{
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ret = nanosleep(&req, &rem);
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req = rem;
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} while (ret == -1 && errno == EINTR);
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}
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#endif // RTP_HAVE_QUERYPERFORMANCECOUNTER
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inline RTPTime &RTPTime::operator-=(const RTPTime &t)
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{
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m_t -= t.m_t;
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return *this;
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}
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inline RTPTime &RTPTime::operator+=(const RTPTime &t)
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{
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m_t += t.m_t;
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return *this;
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}
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inline RTPNTPTime RTPTime::GetNTPTime() const
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{
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uint32_t sec = (uint32_t) m_t;
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uint32_t microsec = (uint32_t) ((m_t - (double) sec) * 1e6);
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uint32_t msw = sec + RTP_NTPTIMEOFFSET;
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uint32_t lsw;
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double x;
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x = microsec / 1000000.0;
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x *= (65536.0 * 65536.0);
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lsw = (uint32_t) x;
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return RTPNTPTime(msw, lsw);
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}
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inline bool RTPTime::operator<(const RTPTime &t) const
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{
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return m_t < t.m_t;
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}
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inline bool RTPTime::operator>(const RTPTime &t) const
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{
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return m_t > t.m_t;
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}
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inline bool RTPTime::operator<=(const RTPTime &t) const
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{
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return m_t <= t.m_t;
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}
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inline bool RTPTime::operator>=(const RTPTime &t) const
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{
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return m_t >= t.m_t;
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}
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class QRTPLIB_API RTPTimeInitializerObject
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{
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public:
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RTPTimeInitializerObject();
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void Dummy()
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{
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dummy++;
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}
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private:
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int dummy;
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};
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extern QRTPLIB_API RTPTimeInitializerObject timeinit;
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} // end namespace
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#endif // RTPTIMEUTILITIES_H
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