mirror of https://github.com/mpv-player/mpv
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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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 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 "timer.h"
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static uint64_t raw_time_offset;
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void mp_time_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 -= 10000000;
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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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#if 0
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#include <stdio.h>
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int main(void) {
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int c = 200;
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int64_t j, r, t = 0;
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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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mp_sleep_us(delay);
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j = (mp_time_us() - r) - delay;
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printf("sleep time: sleep=%8i err=%5i\n", 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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