mirror of
https://github.com/mpv-player/mpv
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891efca9d7
CLOCK_MONOTONIC_RAW is linux-specific (macOS later supported it but it has its own timer code) and not neccessarily available everywhere like on BSDs. It makes sense to prefer it because mpv does a lot of measurements at small intervals (e.g. every frame) so theoretically it should be more accurate. However if the OS doesn't have it, fallback to CLOCK_MONOTONIC instead which is almost exactly the same and very widely supported across unix-like systems. This clock is technically optional according to POSIX, but any half-decent OS supports it anyway (sorry Solaris users). As a benefit, we now know that the clock from mp_time is always monotonic.
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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* precise timer routines for Linux/UNIX
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* copyright (C) LGB & A'rpi/ASTRAL
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*
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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 <time.h>
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#include "timer.h"
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void mp_sleep_ns(int64_t ns)
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{
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if (ns < 0)
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return;
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struct timespec ts;
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ts.tv_sec = ns / MP_TIME_S_TO_NS(1);
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ts.tv_nsec = ns % MP_TIME_S_TO_NS(1);
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nanosleep(&ts, NULL);
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}
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uint64_t mp_raw_time_ns(void)
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{
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struct timespec tp = {0};
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int ret = -1;
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#if defined(CLOCK_MONOTONIC_RAW)
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ret = clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
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#endif
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if (ret)
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clock_gettime(CLOCK_MONOTONIC, &tp);
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return MP_TIME_S_TO_NS(tp.tv_sec) + tp.tv_nsec;
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}
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void mp_raw_time_init(void)
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{
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}
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