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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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2
include/pcm.h
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@ -717,6 +717,8 @@ int snd_pcm_sw_params_set_tstamp_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *param
int snd_pcm_sw_params_get_tstamp_mode(const snd_pcm_sw_params_t *params, snd_pcm_tstamp_t *val);
int snd_pcm_sw_params_set_avail_min(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_avail_min(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_sw_params_set_period_event(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, int val);
int snd_pcm_sw_params_get_period_event(const snd_pcm_sw_params_t *params, int *val);
int snd_pcm_sw_params_set_start_threshold(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_start_threshold(const snd_pcm_sw_params_t *paramsm, snd_pcm_uframes_t *val);
int snd_pcm_sw_params_set_stop_threshold(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);

3
include/sound/asound.h
View file

@ -396,7 +396,8 @@ struct sndrv_pcm_sw_params {
sndrv_pcm_uframes_t silence_threshold; /* min distance from noise for silence filling */
sndrv_pcm_uframes_t silence_size; /* silence block size */
sndrv_pcm_uframes_t boundary; /* pointers wrap point */
unsigned char reserved[64]; /* reserved for future */
unsigned char reserved[60]; /* reserved for future */
unsigned int period_event; /* for alsa-lib implementation */
};
struct sndrv_pcm_channel_info {