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https://github.com/mpv-player/mpv.git
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81439c5f35
Make OS specific timer code export a mp_raw_time_us() function, and add generic implementations of GetTimer()/GetTimerMS() using this function. New mpv code is supposed to call mp_time_us() in situations where precision is absolutely needed, or mp_time_s() otherwise. Make it so that mp_time_us() will return a value near program start. We don't set it to 0 though to avoid confusion with relative vs. absolute time. Instead, pick an arbitrary offset. Move the test program in timer-darwin.c to timer.c, and modify it to work with the generic timer functions.
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* Precise timer routines using Mach timing
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*
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* Copyright (c) 2003-2004, Dan Villiom Podlaski Christiansen
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*/
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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#include <sys/time.h>
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#include <mach/mach_time.h>
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#include "config.h"
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#include "core/mp_msg.h"
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#include "timer.h"
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static double timebase_ratio;
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void mp_sleep_us(int64_t us)
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{
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uint64_t deadline = us / 1e6 / timebase_ratio + mach_absolute_time();
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mach_wait_until(deadline);
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}
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uint64_t mp_raw_time_us(void)
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{
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return mach_absolute_time() * timebase_ratio * 1e6;
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}
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void mp_raw_time_init(void)
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{
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struct mach_timebase_info timebase;
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mach_timebase_info(&timebase);
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timebase_ratio = (double)timebase.numer / (double)timebase.denom * 1e-9;
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}
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