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Implemented snd_pcm_sw_params_(set|get)_period_event for interrupt wakeup like behaviour

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Actually, PCM timer is used as source for poll(). It might be optimized
in the kernel code later.
This commit is contained in:
Jaroslav Kysela 2008-05-09 16:02:02 +02:00
parent c88672d86f
commit 8aaccc9484
6 changed files with 231 additions and 7 deletions
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31
src/pcm/pcm.c
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@ -879,6 +879,7 @@ int snd_pcm_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)
pcm->tstamp_mode = params->tstamp_mode;
pcm->period_step = params->period_step;
pcm->avail_min = params->avail_min;
pcm->period_event = params->period_event;
pcm->start_threshold = params->start_threshold;
pcm->stop_threshold = params->stop_threshold;
pcm->silence_threshold = params->silence_threshold;
@ -1847,6 +1848,7 @@ int snd_pcm_dump_sw_setup(snd_pcm_t *pcm, snd_output_t *out)
snd_output_printf(out, " tstamp_mode : %s\n", snd_pcm_tstamp_mode_name(pcm->tstamp_mode));
snd_output_printf(out, " period_step : %d\n", pcm->period_step);
snd_output_printf(out, " avail_min : %ld\n", pcm->avail_min);
snd_output_printf(out, " period_event : %i\n", pcm->period_event);
snd_output_printf(out, " start_threshold : %ld\n", pcm->start_threshold);
snd_output_printf(out, " stop_threshold : %ld\n", pcm->stop_threshold);
snd_output_printf(out, " silence_threshold: %ld\n", pcm->silence_threshold);
@ -5364,6 +5366,7 @@ int snd_pcm_sw_params_current(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)
params->period_step = pcm->period_step;
params->sleep_min = 0;
params->avail_min = pcm->avail_min;
params->period_event = pcm->period_event;
params->xfer_align = 1;
params->start_threshold = pcm->start_threshold;
params->stop_threshold = pcm->stop_threshold;
@ -5659,6 +5662,34 @@ int snd_pcm_sw_params_get_avail_min(const snd_pcm_sw_params_t *params, snd_pcm_u
return 0;
}
/**
* \brief Set period event inside a software configuration container
* \param pcm PCM handle
* \param params Software configuration container
* \param val 0 = disable period event, 1 = enable period event
* \return 0 otherwise a negative error code
*
* An poll (select) wakeup event is raised if enabled.
*/
int snd_pcm_sw_params_set_period_event(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, int val)
{
assert(pcm && params);
params->period_event = val;
return 0;
}
/**
* \brief Get period event from a software configuration container
* \param params Software configuration container
* \param val returned period event state
* \return 0 otherwise a negative error code
*/
int snd_pcm_sw_params_get_period_event(const snd_pcm_sw_params_t *params, int *val)
{
assert(params && val);
*val = params->period_event;
return 0;
}
/**
* \brief (DEPRECATED) Set xfer align inside a software configuration container