mirror of
https://github.com/mpv-player/mpv
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92b9d75d72
There is not much of a reason to have these wrappers around. Use POSIX standard functions directly, and use a separate utility function to take care of the timespec calculations. (Course POSIX for using this weird format for time values.)
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <pthread.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <limits.h>
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#include <assert.h>
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#include "common/common.h"
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#include "common/msg.h"
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#include "timer.h"
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static uint64_t raw_time_offset;
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static pthread_once_t timer_init_once = PTHREAD_ONCE_INIT;
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static void do_timer_init(void)
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{
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mp_raw_time_init();
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srand(mp_raw_time_us());
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raw_time_offset = mp_raw_time_us();
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// Arbitrary additional offset to avoid confusing relative/absolute times.
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// Also,we rule that the timer never returns 0 (so default-initialized
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// time values will be always in the past).
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raw_time_offset -= MP_START_TIME;
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}
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void mp_time_init(void)
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{
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pthread_once(&timer_init_once, do_timer_init);
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}
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int64_t mp_time_us(void)
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{
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return mp_raw_time_us() - raw_time_offset;
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}
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double mp_time_sec(void)
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{
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return mp_time_us() / (double)(1000 * 1000);
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}
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int64_t mp_time_relative_us(int64_t *t)
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{
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int64_t r = 0;
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int64_t now = mp_time_us();
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if (*t)
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r = now - *t;
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*t = now;
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return r;
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}
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int64_t mp_add_timeout(int64_t time_us, double timeout_sec)
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{
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assert(time_us > 0); // mp_time_us() returns strictly positive values
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double t = MPCLAMP(timeout_sec * (1000 * 1000), -0x1p63, 0x1p63);
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int64_t ti = t == 0x1p63 ? INT64_MAX : (int64_t)t;
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if (ti > INT64_MAX - time_us)
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return INT64_MAX;
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if (ti <= -time_us)
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return 1;
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return time_us + ti;
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}
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static void get_realtime(struct timespec *out_ts)
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{
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#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0
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clock_gettime(CLOCK_REALTIME, out_ts);
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#else
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// OSX
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struct timeval tv;
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gettimeofday(&tv, NULL);
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out_ts->tv_sec = tv.tv_sec;
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out_ts->tv_nsec = tv.tv_usec * 1000UL;
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#endif
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}
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struct timespec mp_time_us_to_timespec(int64_t time_us)
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{
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struct timespec ts;
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get_realtime(&ts);
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// We don't know what time source mp_time_us() uses, but usually it's not
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// CLOCK_REALTIME - so we have to remap the times.
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int64_t unow = mp_time_us();
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int64_t diff_us = time_us - unow;
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int64_t diff_secs = diff_us / (1000L * 1000L);
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long diff_nsecs = (diff_us - diff_secs * (1000L * 1000L)) * 1000L;
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if (diff_nsecs < 0) {
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diff_secs -= 1;
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diff_nsecs += 1000000000L;
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}
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if (diff_nsecs + ts.tv_nsec >= 1000000000UL) {
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diff_secs += 1;
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diff_nsecs -= 1000000000UL;
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}
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// OSX can't deal with large timeouts. Also handles tv_sec/time_t overflows.
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diff_secs = MPMIN(diff_secs, 10000000);
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ts.tv_sec += diff_secs;
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ts.tv_nsec += diff_nsecs;
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return ts;
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}
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struct timespec mp_rel_time_to_timespec(double timeout_sec)
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{
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return mp_time_us_to_timespec(mp_add_timeout(mp_time_us(), timeout_sec));
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}
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#if 0
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#include <stdio.h>
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#include "threads.h"
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#define TEST_SLEEP 1
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int main(void) {
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int c = 2000000;
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int64_t j, r, t = 0;
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pthread_mutex_t mtx;
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pthread_mutex_init(&mtx, NULL);
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pthread_cond_t cnd;
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pthread_cond_init(&cnd, NULL);
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mp_time_init();
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for (int i = 0; i < c; i++) {
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const int delay = rand() / (RAND_MAX / 1e5);
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r = mp_time_us();
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#if TEST_SLEEP
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mp_sleep_us(delay);
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#else
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struct timespec ts = mp_time_us_to_timespec(r + delay);
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pthread_cond_timedwait(&cnd, &mtx, &ts);
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#endif
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j = (mp_time_us() - r) - delay;
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printf("sleep time: t=%"PRId64" sleep=%8i err=%5i\n", r, delay, (int)j);
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t += j;
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}
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fprintf(stderr, "average error:\t%i\n", (int)(t / c));
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return 0;
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}
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#endif
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