mirror of https://github.com/mpv-player/mpv
113 lines
3.0 KiB
C
113 lines
3.0 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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along 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 "misc/random.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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mp_rand_seed(mp_raw_time_ns());
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raw_time_offset = mp_raw_time_ns();
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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_ns(void)
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{
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uint64_t r = mp_raw_time_ns() - raw_time_offset;
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if (r < MP_START_TIME)
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r = MP_START_TIME;
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return r;
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}
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double mp_time_sec(void)
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{
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return mp_time_ns() / 1e9;
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}
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int64_t mp_time_ns_add(int64_t time_ns, double timeout_sec)
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{
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assert(time_ns > 0); // mp_time_ns() returns strictly positive values
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double t = MPCLAMP(timeout_sec * 1e9, -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_ns)
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return INT64_MAX;
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if (ti <= -time_ns)
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return 1;
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return time_ns + ti;
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}
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static int 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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return 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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return 0;
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#endif
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}
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struct timespec mp_time_ns_to_realtime(int64_t time_ns)
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{
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struct timespec ts = {0};
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if (get_realtime(&ts) != 0)
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return ts;
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int64_t time_rel = time_ns - mp_time_ns();
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// clamp to 1000 days in the future
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time_rel = MPMIN(time_rel, 1000 * 24 * 60 * 60 * INT64_C(1000000000));
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ts.tv_sec += time_rel / INT64_C(1000000000);
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ts.tv_nsec += time_rel % INT64_C(1000000000);
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if (ts.tv_nsec >= INT64_C(1000000000)) {
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ts.tv_sec++;
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ts.tv_nsec -= INT64_C(1000000000);
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}
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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_ns_to_realtime(mp_time_ns_add(mp_time_ns(), timeout_sec));
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}
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