osdep/timer-linux.c

   1 /*
   2  * precise timer routines for Linux
   3  * copyright (C) LGB & A'rpi/ASTRAL
   4  *
   5  * This file is part of MPlayer.
   6  *
   7  * MPlayer is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * MPlayer is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <unistd.h>
  23 #ifdef __BEOS__
  24 #define usleep(t) snooze(t)
  25 #endif
  26 #include <stdlib.h>
  27 #include <time.h>
  28 #include <sys/time.h>
  29 #include "config.h"
  30
  31 const char *timer_name =
  32 #ifdef HAVE_NANOSLEEP
  33     "nanosleep()";
  34 #else
  35     "usleep()";
  36 #endif
  37
  38 int usec_sleep(int usec_delay)
  39 {
  40 #ifdef HAVE_NANOSLEEP
  41     struct timespec ts;
  42     ts.tv_sec  =  usec_delay / 1000000;
  43     ts.tv_nsec = (usec_delay % 1000000) * 1000;
  44     return nanosleep(&ts, NULL);
  45 #else
  46     return usleep(usec_delay);
  47 #endif
  48 }
  49
  50 // Returns current time in microseconds
  51 unsigned int GetTimer(void)
  52 {
  53     struct timeval tv;
  54     //float s;
  55     gettimeofday(&tv,NULL);
  56     //s = tv.tv_usec; s *= 0.000001; s += tv.tv_sec;
  57     return tv.tv_sec * 1000000 + tv.tv_usec;
  58 }
  59
  60 // Returns current time in milliseconds
  61 unsigned int GetTimerMS(void)
  62 {
  63     struct timeval tv;
  64     //float s;
  65     gettimeofday(&tv,NULL);
  66     //s = tv.tv_usec; s *= 0.000001; s += tv.tv_sec;
  67     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  68 }
  69
  70 static unsigned int RelativeTime = 0;
  71
  72 // Returns time spent between now and last call in seconds
  73 float GetRelativeTime(void)
  74 {
  75     unsigned int t,r;
  76     t = GetTimer();
  77     //t *= 16; printf("time = %ud\n", t);
  78     r = t - RelativeTime;
  79     RelativeTime = t;
  80     return (float) r * 0.000001F;
  81 }
  82
  83 // Initialize timer, must be called at least once at start
  84 void InitTimer(void)
  85 {
  86     GetRelativeTime();
  87 }
  88
  89
  90 #if 0
  91 #include <stdio.h>
  92 int main(void)
  93 {
  94     float t = 0;
  95     InitTimer();
  96     while (1) {
  97         t += GetRelativeTime();
  98         printf("time = %10.6f\r", t);
  99         fflush(stdout); }
 100 }
 101 #endif