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/*
* precise timer routines for Windows
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <windows.h>
#include <sys/time.h>
#include <mmsystem.h>
#include <stdlib.h>
#include "timer.h"
static LARGE_INTEGER perf_freq;
void mp_sleep_us(int64_t us)
{
if (us < 0)
return;
// Sleep(0) won't sleep for one clocktick as the unix usleep
// instead it will only make the thread ready
// it may take some time until it actually starts to run again
if (us < 1000)
us = 1000;
Sleep(us / 1000);
}
uint64_t mp_raw_time_us(void)
{
LARGE_INTEGER perf_count;
QueryPerformanceCounter(&perf_count);
// Convert QPC units (1/perf_freq seconds) to microseconds. This will work
// without overflow because the QPC value is guaranteed not to roll-over
// within 100 years, so perf_freq must be less than 2.9*10^9.
return perf_count.QuadPart / perf_freq.QuadPart * 1000000 +
perf_count.QuadPart % perf_freq.QuadPart * 1000000 / perf_freq.QuadPart;
}
void mp_raw_time_init(void)
{
QueryPerformanceFrequency(&perf_freq);
timeBeginPeriod(1); // request 1ms timer resolution
}
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