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   struct timeval tv;
  53 //  float s;
  54   gettimeofday(&tv,NULL);
  55 //  s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
  56   return tv.tv_sec * 1000000 + tv.tv_usec;
  57 }
  58
  59 // Returns current time in milliseconds
  60 unsigned int GetTimerMS(void){
  61   struct timeval tv;
  62 //  float s;
  63   gettimeofday(&tv,NULL);
  64 //  s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
  65   return tv.tv_sec * 1000 + tv.tv_usec / 1000;
  66 }
  67
  68 static unsigned int RelativeTime=0;
  69
  70 // Returns time spent between now and last call in seconds
  71 float GetRelativeTime(void){
  72 unsigned int t,r;
  73   t=GetTimer();
  74 //  t*=16;printf("time=%ud\n",t);
  75   r=t-RelativeTime;
  76   RelativeTime=t;
  77   return (float)r * 0.000001F;
  78 }
  79
  80 // Initialize timer, must be called at least once at start
  81 void InitTimer(void){
  82   GetRelativeTime();
  83 }
  84
  85
  86 #if 0
  87 #include <stdio.h>
  88 int main(void){
  89   float t=0;
  90   InitTimer();
  91   while(1){ t+=GetRelativeTime();printf("time= %10.6f\r",t);fflush(stdout); }
  92 }
  93 #endif
  94