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Added more comments by Robert Spier (robrt@users.sourceforge.net)

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Jaroslav Kysela 2002-12-04 15:34:04 +00:00
parent 7fcea07002
commit 7fe18c9561
1 changed files with 11 additions and 2 deletions
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13
src/pcm/pcm.c
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@ -104,8 +104,8 @@ implementation can be found in the \ref alsa_pcm_rw section.
The poll or select functions (see 'man 2 poll' or 'man 2 select' for further The poll or select functions (see 'man 2 poll' or 'man 2 select' for further
details) allows to receive requests/events from the device while details) allows to receive requests/events from the device while
an application is waiting on events from other sources (like keyboard, screen, an application is waiting on events from other sources (like keyboard, screen,
network etc.), too. The select function is old and deprecated in modern network etc.), too. \ref snd_pcm_poll_descriptors can be used to get a file
applications, so the ALSA library does not support it. The implemented descriptor to poll or select on. The implemented
transfer routines can be found in the \ref alsa_transfers section. transfer routines can be found in the \ref alsa_transfers section.
\subsection pcm_transfer_async Asynchronous notification \subsection pcm_transfer_async Asynchronous notification
@ -5157,6 +5157,15 @@ int snd_pcm_sw_params_get_sleep_min(const snd_pcm_sw_params_t *params, unsigned
* \param params Software configuration container * \param params Software configuration container
* \param val Minimum avail frames to consider PCM ready * \param val Minimum avail frames to consider PCM ready
* \return 0 otherwise a negative error code * \return 0 otherwise a negative error code
*
* Note: This is similar to setting an OSS wakeup point. The valid
* values for 'val' are determined by the specific hardware. Most PC
* sound cards can only accept power of 2 frame counts (i.e. 512,
* 1024, 2048). You cannot use this as a high resolution timer - it
* is limited to how often the sound card hardware raises an
* interrupt. Note that you can greatly improve the reponses using
* \ref snd_pcm_sw_params_set_sleep_min where another timing source
* is used.
*/ */
#ifndef DOXYGEN #ifndef DOXYGEN
int snd_pcm_sw_params_set_avail_min(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val) int snd_pcm_sw_params_set_avail_min(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)