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pcm: ioplug: Provide avail helper function for plugins

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This function can be called without calling snd_pcm_avail_update().

The call to snd_pcm_avail_update() can take some time.
Therefore some developers would not like to call it from a real-time
context (e.g. from JACK client context).

Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Timo Wischer 2018-07-03 15:59:21 +02:00 • committed by Takashi Iwai
parent 9bb985c382
commit 2972f2f966
2 changed files with 21 additions and 2 deletions
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3
include/pcm_ioplug.h
View file

@ -235,6 +235,9 @@ int snd_pcm_ioplug_set_param_list(snd_pcm_ioplug_t *io, int type, unsigned int n
int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state);
/* calucalte the available frames */
snd_pcm_uframes_t snd_pcm_ioplug_avail(const snd_pcm_ioplug_t * const ioplug,
const snd_pcm_uframes_t hw_ptr,
const snd_pcm_uframes_t appl_ptr);
snd_pcm_uframes_t snd_pcm_ioplug_hw_avail(const snd_pcm_ioplug_t * const ioplug,
const snd_pcm_uframes_t hw_ptr,
const snd_pcm_uframes_t appl_ptr);

20
src/pcm/pcm_ioplug.c
View file

@ -1215,6 +1215,21 @@ int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state)
return 0;
}
/**
* \brief Get the available frames. This function can be used to calculate the
* the available frames before calling #snd_pcm_avail_update()
* \param ioplug the ioplug handle
* \param hw_ptr hardware pointer in frames
* \param appl_ptr application pointer in frames
* \return available frames for the application
*/
snd_pcm_uframes_t snd_pcm_ioplug_avail(const snd_pcm_ioplug_t * const ioplug,
const snd_pcm_uframes_t hw_ptr,
const snd_pcm_uframes_t appl_ptr)
{
return __snd_pcm_avail(ioplug->pcm, hw_ptr, appl_ptr);
}
/**
* \brief Get the available frames. This function can be used to calculate the
* the available frames before calling #snd_pcm_avail_update()
@ -1230,8 +1245,9 @@ snd_pcm_uframes_t snd_pcm_ioplug_hw_avail(const snd_pcm_ioplug_t * const ioplug,
/* available data/space which can be transferred by the user
* application
*/
const snd_pcm_uframes_t user_avail = __snd_pcm_avail(ioplug->pcm,
hw_ptr, appl_ptr);
const snd_pcm_uframes_t user_avail = snd_pcm_ioplug_avail(ioplug,
hw_ptr,
appl_ptr);
if (user_avail > ioplug->pcm->buffer_size) {
/* there was an Xrun */