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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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47
src/modules/alsa/alsa-sink.c
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@ -109,6 +109,8 @@ struct userdata {
pa_cvolume hardware_volume;
unsigned int *rates;
size_t
frame_size,
fragment_size,
@ -1509,8 +1511,8 @@ static pa_idxset* sink_get_formats(pa_sink *s) {
static pa_bool_t sink_set_formats(pa_sink *s, pa_idxset *formats) {
struct userdata *u = s->userdata;
pa_format_info *f;
uint32_t idx;
pa_format_info *f, *g;
uint32_t idx, n;
pa_assert(u);
@ -1528,16 +1530,26 @@ static pa_bool_t sink_set_formats(pa_sink *s, pa_idxset *formats) {
* This is fine for now since we don't support that via the passthrough
* framework, but this must be changed if we do. */
/* Count how many sample rates we support */
for (idx = 0, n = 0; u->rates[idx]; idx++)
n++;
/* First insert non-PCM formats since we prefer those. */
PA_IDXSET_FOREACH(f, formats, idx) {
if (!pa_format_info_is_pcm(f))
pa_idxset_put(u->formats, pa_format_info_copy(f), NULL);
if (!pa_format_info_is_pcm(f)) {
g = pa_format_info_copy(f);
pa_format_info_set_prop_int_array(g, PA_PROP_FORMAT_RATE, (int *) u->rates, n);
pa_idxset_put(u->formats, g, NULL);
}
}
/* Now add any PCM formats */
PA_IDXSET_FOREACH(f, formats, idx) {
if (pa_format_info_is_pcm(f))
if (pa_format_info_is_pcm(f)) {
/* We don't set rates here since we'll just tack on a resampler for
* unsupported rates */
pa_idxset_put(u->formats, pa_format_info_copy(f), NULL);
}
}
return TRUE;
@ -1546,13 +1558,29 @@ static pa_bool_t sink_set_formats(pa_sink *s, pa_idxset *formats) {
static pa_bool_t sink_update_rate_cb(pa_sink *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_SINK_IS_OPENED(s->state)) {
pa_log_info("Updating rate for device %s, new rate is %d",u->device_name, rate);
u->sink->sample_spec.rate = rate;
return TRUE;
}
return FALSE;
}
@ -2121,6 +2149,12 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
if (is_iec958(u) || is_hdmi(u))
set_formats = TRUE;
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);
@ -2350,6 +2384,9 @@ static void userdata_free(struct userdata *u) {
if (u->formats)
pa_idxset_free(u->formats, (pa_free2_cb_t) pa_format_info_free2, NULL);
if (u->rates)
pa_xfree(u->rates);
reserve_done(u);
monitor_done(u);