mirror of https://github.com/mpv-player/mpv
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <windows.h>
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#include <mmsystem.h>
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#include <sys/time.h>
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static LARGE_INTEGER qwTimerFrequency;
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static LARGE_INTEGER qwTimerStart;
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static LARGE_INTEGER m_lStartTime;
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static float m_fuSecsPerTick;
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static unsigned long RelativeTime = 0;
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int usec_sleep(int usec_delay)
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{
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LARGE_INTEGER qwStartTicks, qwCurrTicks;
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double dResult;
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long lTick;
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double fuSecDelay = ((float) usec_delay) / 1000000.0;
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QueryPerformanceCounter(&qwStartTicks);
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do {
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QueryPerformanceCounter(&qwCurrTicks);
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dResult =
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((double) (qwCurrTicks.QuadPart - qwStartTicks.QuadPart)) /
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((double) (qwTimerFrequency.QuadPart));
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} while (dResult < fuSecDelay);
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}
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// Returns current time in microseconds
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unsigned long GetTimer()
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{
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LARGE_INTEGER qwTime;
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FLOAT fTime;
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UINT64 uiQuadPart;
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QueryPerformanceCounter(&qwTime);
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qwTime.QuadPart -= m_lStartTime.QuadPart;
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uiQuadPart = (UINT64) qwTime.QuadPart;
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uiQuadPart /= ((UINT64) 10); // prevent overflow after 4294.1 secs, now overflows after 42941 secs
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fTime = ((FLOAT) (uiQuadPart)) / m_fuSecsPerTick;
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return (unsigned long) fTime;
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}
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// Returns current time in microseconds
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float GetRelativeTime()
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{
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unsigned long t, r;
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t = GetTimer();
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r = t - RelativeTime;
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RelativeTime = t;
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return (float) r *0.000001F;
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}
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// Returns current time in milliseconds
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unsigned int GetTimerMS()
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{
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return GetTimer() / 1000;
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}
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void InitTimer()
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{
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FLOAT t;
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QueryPerformanceFrequency(&qwTimerFrequency); // ticks/sec
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m_fuSecsPerTick = (FLOAT) (((FLOAT) (qwTimerFrequency.QuadPart)) / 1000.0); // tics/msec
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m_fuSecsPerTick = (FLOAT) (m_fuSecsPerTick / 1000.0); // ticks/usec
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m_fuSecsPerTick /= 10.0;
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QueryPerformanceCounter(&m_lStartTime);
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t = GetRelativeTime();
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}
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