mirror of https://github.com/mpv-player/mpv
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
|
|
* 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>
|
|
#include <pthread.h>
|
|
|
|
#include "timer.h"
|
|
#include "common/msg.h"
|
|
|
|
static uint64_t raw_time_offset;
|
|
pthread_once_t timer_init_once = PTHREAD_ONCE_INIT;
|
|
|
|
static void do_timer_init(void)
|
|
{
|
|
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;
|
|
}
|
|
|
|
void mp_time_init(void)
|
|
{
|
|
pthread_once(&timer_init_once, do_timer_init);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#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
|