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mpv/osdep/timer.c

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timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
/*
* 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 <stdlib.h>
timer: init only once This avoids trouble if another mpv instance is initialized in the same process. Since timeBeginPeriod/timeEndPeriod are hereby not easily matched anymore, use an atexit() handler to call timeEndPeriod, so that we can be sure these calls are matched, even if we allow multiple initializations later when introducing the client API.
2014-02-06 20:04:24 +00:00
#include <pthread.h>
timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
#include "timer.h"
timer: add utility function to get relative time
2014-02-28 22:18:52 +00:00
#include "common/msg.h"
timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
static uint64_t raw_time_offset;
timer: init only once This avoids trouble if another mpv instance is initialized in the same process. Since timeBeginPeriod/timeEndPeriod are hereby not easily matched anymore, use an atexit() handler to call timeEndPeriod, so that we can be sure these calls are matched, even if we allow multiple initializations later when introducing the client API.
2014-02-06 20:04:24 +00:00
pthread_once_t timer_init_once = PTHREAD_ONCE_INIT;
timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
timer: init only once This avoids trouble if another mpv instance is initialized in the same process. Since timeBeginPeriod/timeEndPeriod are hereby not easily matched anymore, use an atexit() handler to call timeEndPeriod, so that we can be sure these calls are matched, even if we allow multiple initializations later when introducing the client API.
2014-02-06 20:04:24 +00:00
static void do_timer_init(void)
timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
{
mp_raw_time_init();
srand(mp_raw_time_us());
raw_time_offset = mp_raw_time_us();
// Arbitrary additional offset to avoid confusing relative/absolute times.
// Also,we rule that the timer never returns 0 (so default-initialized
// time values will be always in the past).
raw_time_offset -= 10000000;
}
timer: init only once This avoids trouble if another mpv instance is initialized in the same process. Since timeBeginPeriod/timeEndPeriod are hereby not easily matched anymore, use an atexit() handler to call timeEndPeriod, so that we can be sure these calls are matched, even if we allow multiple initializations later when introducing the client API.
2014-02-06 20:04:24 +00:00
void mp_time_init(void)
{
pthread_once(&timer_init_once, do_timer_init);
}
timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
int64_t mp_time_us(void)
{
return mp_raw_time_us() - raw_time_offset;
}
double mp_time_sec(void)
{
return mp_time_us() / (double)(1000 * 1000);
}
timer: add utility function to get relative time
2014-02-28 22:18:52 +00:00
int64_t mp_time_relative_us(int64_t *t)
{
int64_t r = 0;
int64_t now = mp_time_us();
if (*t)
r = now - *t;
*t = now;
return r;
}
timer: refactor, add 64 bit timer function Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
2013-05-17 17:54:37 +00:00
#if 0
#include <stdio.h>
int main(void) {
int c = 200;
int64_t j, r, t = 0;
mp_time_init();
for (int i = 0; i < c; i++) {
const int delay = rand() / (RAND_MAX / 1e5);
r = mp_time_us();
mp_sleep_us(delay);
j = (mp_time_us() - r) - delay;
printf("sleep time: sleep=%8i err=%5i\n", delay, (int)j);
t += j;
}
fprintf(stderr, "average error:\t%i\n", (int)(t / c));
return 0;
}
#endif