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alsa: Probe sink/source sample rates

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This probes sink and source sample rates and uses this information to
validate rate changes and check incoming passthrough formats.
This commit is contained in:
Arun Raghavan 2011-10-17 22:46:06 +05:30
parent 3555634e6e
commit e67440e220
4 changed files with 107 additions and 5 deletions
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27
src/modules/alsa/alsa-source.c
View file

@ -99,6 +99,8 @@ struct userdata {
pa_cvolume hardware_volume;
unsigned int *rates;
size_t
frame_size,
fragment_size,
@ -1385,13 +1387,29 @@ static void source_update_requested_latency_cb(pa_source *s) {
static pa_bool_t source_update_rate_cb(pa_source *s, uint32_t rate)
{
struct userdata *u = s->userdata;
int i;
pa_bool_t supported = FALSE;
pa_assert(u);
for (i = 0; u->rates[i]; i++) {
if (u->rates[i] == rate) {
supported = TRUE;
break;
}
}
if (!supported) {
pa_log_info("Sink does not support sample rate of %d Hz", rate);
return FALSE;
}
if (!PA_SOURCE_IS_OPENED(s->state)) {
pa_log_info("Updating rate for device %s, new rate is %d", u->device_name, rate);
u->source->sample_spec.rate = rate;
return TRUE;
}
return FALSE;
}
@ -1862,6 +1880,12 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
if (u->use_tsched)
pa_log_info("Successfully enabled timer-based scheduling mode.");
u->rates = pa_alsa_get_supported_rates(u->pcm_handle);
if (!u->rates) {
pa_log_error("Failed to find any supported sample rates.");
goto fail;
}
/* ALSA might tweak the sample spec, so recalculate the frame size */
frame_size = pa_frame_size(&ss);
@ -2062,6 +2086,9 @@ static void userdata_free(struct userdata *u) {
if (u->smoother)
pa_smoother_free(u->smoother);
if (u->rates)
pa_xfree(u->rates);
reserve_done(u);
monitor_done(u);