static double timing_sleep(double time_frame)
{
    int x=0,y=0;
    double t=time_frame;
    if(time_frame>1)
    {
    	printf("time_frame too big: %f\n",time_frame);
    	time_frame=0.04;
    }

#ifdef HAVE_RTC
    if (rtc_fd >= 0){
	// -------- RTC -----------
	current_module="sleep_rtc";
        while (time_frame > 0.000) {
	    unsigned long rtc_ts;
	    if (read(rtc_fd, &rtc_ts, sizeof(rtc_ts)) <= 0)
		mp_msg(MSGT_CPLAYER, MSGL_ERR, MSGTR_LinuxRTCReadError, strerror(errno));
    	    time_frame -= GetRelativeTime();
	}
    } else
#endif
    {
	// assume kernel HZ=100 for softsleep, works with larger HZ but with
	// unnecessarily high CPU usage
    double margin = softsleep ? 0.0011 : 0.0;
    unsigned int sleep_time;
    sleep_time=(time_frame - margin)*1000000;
	current_module = "sleep_timer";
//	printf("timing_sleep run ");
	while (time_frame > margin) {
	    usec_sleep(sleep_time);
	    y++;
	    time_frame -= GetRelativeTime();
	    if(time_frame<0.0021 || time_frame>t) break;
	}
	//printf("-end\n");
	if (softsleep){
	//printf("sleep_soft run\n");
	    current_module = "sleep_soft";
	    if (time_frame < 0)
	    {
		mp_msg(MSGT_AVSYNC, MSGL_WARN, MSGTR_SoftsleepUnderflow);
		printf("SoftsleepUnderflow: %f\n",time_frame);
	    }
		while (time_frame > margin) {
		    usec_sleep(1000000 * (time_frame - margin));
		    time_frame -= GetRelativeTime();
		    y++;
		}

	    while (time_frame > 0.0000005)
	    {
	    	x++;
	    	time_frame-=GetRelativeTime(); // burn the CPU
	    	if(x>20000) break;
		}
		//printf("-end\nsleep_soft run ");
	}
    }
    if(time_frame >0.0000005 || time_frame<-0.1 || x>20000 || y>1)
    {
    	printf("orig: %f  timeframe: %f   x: %i  y: %i\n",t,time_frame,x,y);
    }

    if(time_frame<-0.01 || time_frame>0.01)
    {
    	time_frame=0.001;
    	GetRelativeTime();
    }

    return time_frame;
}