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alsa: get avail, delay, timestamps in a single kernel call

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Refactor code to fetch avail, delay and timestamp values
in a single call to snd_pcm_status().
The information reported is exactly the same as before,
however it is extracted in a more atomic manner to
improve timer-based scheduling.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
This commit is contained in:
Pierre-Louis Bossart 2012-07-29 19:46:59 -05:00 • committed by David Henningsson
parent 700cd890a9
commit 635eef9981
4 changed files with 21 additions and 22 deletions
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17
src/modules/alsa/alsa-util.c
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@ -1141,10 +1141,11 @@ snd_pcm_sframes_t pa_alsa_safe_avail(snd_pcm_t *pcm, size_t hwbuf_size, const pa
return n;
}
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss, pa_bool_t capture) {
int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_status_t *status, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss,
pa_bool_t capture) {
ssize_t k;
size_t abs_k;
int r;
int err;
snd_pcm_sframes_t avail = 0;
pa_assert(pcm);
@ -1154,10 +1155,16 @@ int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_si
/* Some ALSA driver expose weird bugs, let's inform the user about
* what is going on. We're going to get both the avail and delay values so
* that we can compare and check them for capture */
* that we can compare and check them for capture.
* This is done with snd_pcm_status() which provides
* avail, delay and timestamp values in a single kernel call to improve
* timer-based scheduling */
if ((r = snd_pcm_avail_delay(pcm, &avail, delay)) < 0)
return r;
if ((err = snd_pcm_status(pcm, status)) < 0)
return err;
avail = snd_pcm_status_get_avail(status);
*delay = snd_pcm_status_get_delay(status);
k = (ssize_t) *delay * (ssize_t) pa_frame_size(ss);