C++ (Cpp) snd_timer_params_get_ticks Examples

Example #1

File: pcm_a2dp.c Project: fullstory-morgue/btsco

static void a2dp_init(void)
{
	snd_async_handler_t *async;
	snd_timer_info_t *info;
	snd_timer_params_t *params;
	long resolution;
	char timername[64];
	int err, i;

	a2dp_lock();

	for (i = 0; i < MAX_CONNECTIONS; i++)
		connections[i] = NULL;

	a2dp_unlock();

	snd_timer_info_alloca(&info);
	snd_timer_params_alloca(&params);

	sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i",
		SND_TIMER_CLASS_GLOBAL, SND_TIMER_CLASS_NONE, 0,
					SND_TIMER_GLOBAL_SYSTEM, 0);

	err = snd_timer_open(&timer, timername, SND_TIMER_OPEN_NONBLOCK);
	if (err < 0) {
		SNDERR("Can't open global timer");
		return;
	}

	err = snd_timer_info(timer, info);
	if (err < 0) {
		SNDERR("Can't get global timer info");
		return;
	}

	snd_timer_params_set_auto_start(params, 1);

	resolution = snd_timer_info_get_resolution(info);
	snd_timer_params_set_ticks(params, 1000000000 / resolution);
	if (snd_timer_params_get_ticks(params) < 1)
		snd_timer_params_set_ticks(params, 1);

	err = snd_timer_params(timer, params);
	if (err < 0) {
		SNDERR("Can't set global timer parameters");
		snd_timer_close(timer);
		return;
	}

	err = snd_async_add_timer_handler(&async, timer, a2dp_timer, NULL);
	if (err < 0) {
		SNDERR("Can't create global async callback");
		snd_timer_close(timer);
		return;
	}

	err = snd_timer_start(timer);

}

Example #2

File: alsatimer.cpp Project: AndreeeCZ/muse

  unsigned int AlsaTimer::setTimerFreq(unsigned int freq)
    {
    signed int err;
    unsigned int setTick, actFreq;
    
    if(TIMER_DEBUG)
      printf("AlsaTimer::setTimerFreq(this=%p)\n",this);

    setTick = (1000000000 / snd_timer_info_get_resolution(info)) / freq;

    if (setTick == 0) {
      // return, print error if freq is below 500 (timing will suffer)
      if (((1000000000.0 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params)) < 500) {
        fprintf(stderr,"AlsaTimer::setTimerTicks(): requested freq %u Hz too high for timer (max is %g)\n",
          freq, 1000000000.0 / snd_timer_info_get_resolution(info));
        fprintf(stderr,"  freq stays at %ld Hz\n",
          (long int)((1000000000.0 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params)));
      }

      return (long int)((1000000000.0 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params));
    }
    actFreq = (1000000000 / snd_timer_info_get_resolution(info)) / setTick;
    if (actFreq != freq) {
      fprintf(stderr,"AlsaTimer::setTimerTicks(): warning: requested %u Hz, actual freq is %u Hz\n",
        freq, actFreq);
    }
    if(TIMER_DEBUG)
      printf("AlsaTimer::setTimerFreq(): Setting ticks (period) to %d ticks\n", setTick);
    snd_timer_params_set_auto_start(params, 1);
    snd_timer_params_set_ticks(params, setTick);
    if ((err = snd_timer_params(handle, params)) < 0) {
      fprintf(stderr, "AlsaTimer::setTimerFreq(): timer params %i (%s)\n", err, snd_strerror(err));
      return 0;
      }

    return actFreq;
    }

Example #3

File: alsatimer.cpp Project: AndreeeCZ/muse

 unsigned int AlsaTimer::getTimerFreq()
   {
   return (1000000000 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params);
   }