diff options
| author | Timo Wischer <twischer@de.adit-jv.com> | 2018-07-03 15:59:21 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-07-03 16:36:34 +0200 |
| commit | 2972f2f9662aaf050addf6254363164ef8bf676e (patch) | |
| tree | e4c372984784731be12bfaee03b1f2142a8d13b2 | |
| parent | 9bb985c382bab8c3bf83c0d23f50195288d3cf9f (diff) | |
pcm: ioplug: Provide avail helper function for plugins
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>
| -rw-r--r-- | include/pcm_ioplug.h | 3 | ||||
| -rw-r--r-- | src/pcm/pcm_ioplug.c | 20 |
2 files changed, 21 insertions, 2 deletions
diff --git a/include/pcm_ioplug.h b/include/pcm_ioplug.h index c1310e3b..b16fc8b8 100644 --- a/include/pcm_ioplug.h +++ b/include/pcm_ioplug.h @@ -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); diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c index 4d44ae22..6d52c27b 100644 --- a/src/pcm/pcm_ioplug.c +++ b/src/pcm/pcm_ioplug.c @@ -1221,6 +1221,21 @@ int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state) * \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() + * \param ioplug the ioplug handle + * \param hw_ptr hardware pointer in frames + * \param appl_ptr application pointer in frames * \return available frames for the hardware */ snd_pcm_uframes_t snd_pcm_ioplug_hw_avail(const snd_pcm_ioplug_t * const ioplug, @@ -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 */ |