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 #include "timer.h"
  31
  32 const char *timer_name =
  33 #ifdef HAVE_NANOSLEEP
  34     "nanosleep()";
  35 #else
  36     "usleep()";
  37 #endif
  38
  39 int usec_sleep(int usec_delay)
  40 {
  41 #ifdef HAVE_NANOSLEEP
  42     struct timespec ts;
  43     ts.tv_sec  =  usec_delay / 1000000;
  44     ts.tv_nsec = (usec_delay % 1000000) * 1000;
  45     return nanosleep(&ts, NULL);
  46 #else
  47     return usleep(usec_delay);
  48 #endif
  49 }
  50
  51 // Returns current time in microseconds
  52 unsigned int GetTimer(void)
  53 {
  54     struct timeval tv;
  55     //float s;
  56     gettimeofday(&tv,NULL);
  57     //s = tv.tv_usec; s *= 0.000001; s += tv.tv_sec;
  58     return tv.tv_sec * 1000000 + tv.tv_usec;
  59 }
  60
  61 // Returns current time in milliseconds
  62 unsigned int GetTimerMS(void)
  63 {
  64     struct timeval tv;
  65     //float s;
  66     gettimeofday(&tv,NULL);
  67     //s = tv.tv_usec; s *= 0.000001; s += tv.tv_sec;
  68     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  69 }
  70
  71 static unsigned int RelativeTime = 0;
  72
  73 // Returns time spent between now and last call in seconds
  74 float GetRelativeTime(void)
  75 {
  76     unsigned int t,r;
  77     t = GetTimer();
  78     //t *= 16; printf("time = %ud\n", t);
  79     r = t - RelativeTime;
  80     RelativeTime = t;
  81     return (float) r * 0.000001F;
  82 }
  83
  84 // Initialize timer, must be called at least once at start
  85 void InitTimer(void)
  86 {
  87     GetRelativeTime();
  88 }
  89
  90
  91 #if 0
  92 #include <stdio.h>
  93 int main(void)
  94 {
  95     float t = 0;
  96     InitTimer();
  97     while (1) {
  98         t += GetRelativeTime();
  99         printf("time = %10.6f\r", t);
 100         fflush(stdout); }
 101 }
 102 #endif