subreader: More strict autodetection of RT subtitle format
[mplayer/glamo.git] / osdep / timer-darwin.c
blobbc25a577618f055308acbeb5d7a9131fc6e3dd81
1 /*
2 * Precise timer routines using Mach timing
4 * Copyright (c) 2003-2004, Dan Villiom Podlaski Christiansen
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without
9 * restriction, including without limitation the rights to use, copy,
10 * modify, merge, publish, distribute, sublicense, and/or sell copies
11 * of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
18 #include <unistd.h>
19 #include <stdlib.h>
20 #include <time.h>
21 #include <math.h>
22 #include <sys/time.h>
23 #include <mach/mach_time.h>
25 #include "config.h"
26 #include "mp_msg.h"
27 #include "timer.h"
29 /* global variables */
30 static double timebase_ratio;
32 const char timer_name[] = "Darwin accurate";
36 /* the core sleep function, uses floats and is used in MPlayer G2 */
37 static float sleep_accurate(float time_frame)
39 uint64_t deadline = time_frame / timebase_ratio + mach_absolute_time();
41 mach_wait_until(deadline);
43 return (mach_absolute_time() - deadline) * timebase_ratio;
46 /* wrapper for MPlayer G1 */
47 int usec_sleep(int usec_delay)
49 return sleep_accurate(usec_delay / 1e6) * 1e6;
53 /* current time in microseconds */
54 unsigned int GetTimer(void)
56 return (unsigned int)(uint64_t)(mach_absolute_time() * timebase_ratio * 1e6);
59 /* current time in milliseconds */
60 unsigned int GetTimerMS(void)
62 return (unsigned int)(uint64_t)(mach_absolute_time() * timebase_ratio * 1e3);
65 /* initialize timer, must be called at least once at start */
66 void InitTimer(void)
68 struct mach_timebase_info timebase;
70 mach_timebase_info(&timebase);
71 timebase_ratio = (double)timebase.numer / (double)timebase.denom
72 * (double)1e-9;
75 #if 0
76 #include <stdio.h>
78 int main(void) {
79 int i,j, r, c = 200;
80 long long t = 0;
82 InitTimer();
84 for (i = 0; i < c; i++) {
85 const int delay = rand() / (RAND_MAX / 1e5);
86 j = GetTimer();
87 #if 1
88 r = usec_sleep(delay);
89 #else
90 r = sleep_accurate(delay / 1e6) * 1e6;
91 #endif
92 j = (GetTimer() - j) - delay;
93 printf("sleep time:%8i %5i (%i)\n", delay, j, j - r);
94 t += j - r;
96 fprintf(stderr, "average error:\t%lli\n", t / c);
98 return 0;
100 #endif