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alsa: support for alternate sampling rate

Browse source 
This is where the actual changes happen.
Some additional checks would be required to make sure the
rate is actually supported
Tested with both PCM and passthrough streams

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
This commit is contained in:
Pierre-Louis Bossart 2011-08-02 18:37:29 -05:00 • committed by Arun Raghavan
parent f0ec495938
commit b232fbd8f8
4 changed files with 48 additions and 50 deletions
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22
src/modules/alsa/alsa-source.c
View file

@ -1382,6 +1382,19 @@ static void source_update_requested_latency_cb(pa_source *s) {
update_sw_params(u);
}
static pa_bool_t source_update_rate_cb(pa_source *s, uint32_t rate)
{
struct userdata *u = s->userdata;
pa_assert(u);
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;
}
static void thread_func(void *userdata) {
struct userdata *u = userdata;
unsigned short revents = 0;
@ -1674,6 +1687,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
struct userdata *u = NULL;
const char *dev_id = NULL;
pa_sample_spec ss;
uint32_t alternate_sample_rate;
pa_channel_map map;
uint32_t nfrags, frag_size, buffer_size, tsched_size, tsched_watermark;
snd_pcm_uframes_t period_frames, buffer_frames, tsched_frames;
@ -1692,6 +1706,12 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
goto fail;
}
alternate_sample_rate = m->core->alternate_sample_rate;
if (pa_modargs_get_alternate_sample_rate(ma, &alternate_sample_rate) < 0) {
pa_log("Failed to parse alternate sample rate");
goto fail;
}
frame_size = pa_frame_size(&ss);
nfrags = m->core->default_n_fragments;
@ -1867,6 +1887,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
pa_source_new_data_set_sample_spec(&data, &ss);
pa_source_new_data_set_channel_map(&data, &map);
pa_source_new_data_set_alternate_sample_rate(&data, alternate_sample_rate);
pa_alsa_init_proplist_pcm(m->core, data.proplist, u->pcm_handle);
pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->device_name);
@ -1918,6 +1939,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
u->source->update_requested_latency = source_update_requested_latency_cb;
u->source->set_state = source_set_state_cb;
u->source->set_port = source_set_port_cb;
u->source->update_rate = source_update_rate_cb;
u->source->userdata = u;
pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);