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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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12
src/modules/alsa/alsa-source.c
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@ -767,6 +767,7 @@ static void update_smoother(struct userdata *u) {
int err;
pa_usec_t now1 = 0, now2;
snd_pcm_status_t *status;
snd_htimestamp_t htstamp = { 0, 0 };
snd_pcm_status_alloca(&status);
@ -775,18 +776,13 @@ static void update_smoother(struct userdata *u) {
/* Let's update the time smoother */
if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->source->sample_spec, TRUE)) < 0)) {
if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, status, &delay, u->hwbuf_size, &u->source->sample_spec, TRUE)) < 0)) {
pa_log_warn("Failed to get delay: %s", pa_alsa_strerror(err));
return;
}
if (PA_UNLIKELY((err = snd_pcm_status(u->pcm_handle, status)) < 0))
pa_log_warn("Failed to get timestamp: %s", pa_alsa_strerror(err));
else {
snd_htimestamp_t htstamp = { 0, 0 };
snd_pcm_status_get_htstamp(status, &htstamp);
now1 = pa_timespec_load(&htstamp);
}
snd_pcm_status_get_htstamp(status, &htstamp);
now1 = pa_timespec_load(&htstamp);
/* Hmm, if the timestamp is 0, then it wasn't set and we take the current time */
if (now1 <= 0)