testtimer.c

网络MPEG4IP流媒体开发源代码

/* Test program to check the resolution of the SDL timer on the current
   platform
*/

#include <stdlib.h>
#include <stdio.h>

#include "SDL.h"

#define DEFAULT_RESOLUTION	1

static int ticks = 0;

static Uint32 ticktock(Uint32 interval)
{
	++ticks;
	return(interval);
}

static Uint32 callback(Uint32 interval, void *param)
{
  printf("Timer %d : param = %d\n", interval, (int) param);
  return interval;
}

int main(int argc, char *argv[])
{
	int desired;
	SDL_TimerID t1, t2, t3;

	if ( SDL_Init(SDL_INIT_TIMER) < 0 ) {
		fprintf(stderr, "Couldn't load SDL: %s\n", SDL_GetError());
		exit(1);
	}
	atexit(SDL_Quit);

	/* Start the timer */
	desired = 0;
	if ( argv[1] ) {
		desired = atoi(argv[1]);
	}
	if ( desired == 0 ) {
		desired = DEFAULT_RESOLUTION;
	}
	SDL_SetTimer(desired, ticktock);

	/* Wait 10 seconds */
	printf("Waiting 10 seconds\n");
	SDL_Delay(10*1000);

	/* Stop the timer */
	SDL_SetTimer(0, NULL);

	/* Print the results */
	if ( ticks ) {
		fprintf(stderr,
		"Timer resolution: desired = %d ms, actual = %f ms\n",
					desired, (double)(10*1000)/ticks);
	}
	
	/* Test multiple timers */
	printf("Testing multiple timers...\n");
	t1 = SDL_AddTimer(100, callback, (void*)1);
	if(!t1)
	  fprintf(stderr,"Could not create timer 1\n");
	t2 = SDL_AddTimer(50, callback, (void*)2);
	if(!t2)
	  fprintf(stderr,"Could not create timer 2\n");
	t3 = SDL_AddTimer(233, callback, (void*)3);
	if(!t3)
	  fprintf(stderr,"Could not create timer 3\n");
	
	/* Wait 10 seconds */
	printf("Waiting 10 seconds\n");
	SDL_Delay(10*1000);

	printf("Removing timer 1 and waiting 5 more seconds\n");
	SDL_RemoveTimer(t1);

	SDL_Delay(5*1000);

	SDL_RemoveTimer(t2);
	SDL_RemoveTimer(t3);

	return(0);
}