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sink,source: support for rate update

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Avoid resampling or use integer resampling when supported by the
sinks/sources

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
This commit is contained in:
Pierre-Louis Bossart 2011-08-02 18:37:28 -05:00 • committed by Arun Raghavan
parent 5bcfd2b630
commit f0ec495938
7 changed files with 219 additions and 0 deletions
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77
src/pulsecore/sink.c
View file

@ -106,6 +106,13 @@ void pa_sink_new_data_set_channel_map(pa_sink_new_data *data, const pa_channel_m
data->channel_map = *map;
}
void pa_sink_new_data_set_alternate_sample_rate(pa_sink_new_data *data, const uint32_t alternate_sample_rate) {
pa_assert(data);
data->alternate_sample_rate_is_set = TRUE;
data->alternate_sample_rate = alternate_sample_rate;
}
void pa_sink_new_data_set_volume(pa_sink_new_data *data, const pa_cvolume *volume) {
pa_assert(data);
@ -182,6 +189,7 @@ static void reset_callbacks(pa_sink *s) {
s->set_port = NULL;
s->get_formats = NULL;
s->set_formats = NULL;
s->update_rate = NULL;
}
/* Called from main context */
@ -277,6 +285,11 @@ pa_sink* pa_sink_new(
s->sample_spec = data->sample_spec;
s->channel_map = data->channel_map;
if (data->alternate_sample_rate_is_set)
s->alternate_sample_rate = data->alternate_sample_rate;
else
s->alternate_sample_rate = s->core->alternate_sample_rate;
s->default_sample_rate = s->sample_spec.rate;
s->inputs = pa_idxset_new(NULL, NULL);
s->n_corked = 0;
@ -364,6 +377,7 @@ pa_sink* pa_sink_new(
pa_source_new_data_init(&source_data);
pa_source_new_data_set_sample_spec(&source_data, &s->sample_spec);
pa_source_new_data_set_channel_map(&source_data, &s->channel_map);
pa_source_new_data_set_alternate_sample_rate(&source_data, s->alternate_sample_rate);
source_data.name = pa_sprintf_malloc("%s.monitor", name);
source_data.driver = data->driver;
source_data.module = data->module;
@ -1312,6 +1326,69 @@ void pa_sink_render_full(pa_sink *s, size_t length, pa_memchunk *result) {
pa_sink_unref(s);
}
/* Called from main thread */
pa_bool_t pa_sink_update_rate(pa_sink *s, uint32_t rate, pa_bool_t passthrough)
{
if (s->update_rate) {
uint32_t desired_rate = rate;
uint32_t default_rate = s->default_sample_rate;
uint32_t alternate_rate = s->alternate_sample_rate;
pa_bool_t use_alternate = FALSE;
if (PA_SINK_IS_RUNNING(s->state)) {
pa_log_info("Cannot update rate, SINK_IS_RUNNING, will keep using %u kHz",
s->sample_spec.rate);
return FALSE;
}
if (s->monitor_source) {
if (PA_SOURCE_IS_RUNNING(s->monitor_source->state) == TRUE) {
pa_log_info("Cannot update rate, monitor source is RUNNING");
return FALSE;
}
}
if (PA_UNLIKELY (desired_rate < 8000 ||
desired_rate > PA_RATE_MAX))
return FALSE;
if (!passthrough) {
pa_assert(default_rate % 4000 || default_rate % 11025);
pa_assert(alternate_rate % 4000 || alternate_rate % 11025);
if (default_rate % 4000) {
/* default is a 11025 multiple */
if ((alternate_rate % 4000 == 0) && (desired_rate % 4000 == 0))
use_alternate=TRUE;
} else {
/* default is 4000 multiple */
if ((alternate_rate % 11025 == 0) && (desired_rate % 11025 == 0))
use_alternate=TRUE;
}
if (use_alternate)
desired_rate = alternate_rate;
else
desired_rate = default_rate;
} else {
desired_rate = rate; /* use stream sampling rate, discard default/alternate settings */
}
if (passthrough || pa_sink_used_by(s) == 0) {
pa_sink_suspend(s, TRUE, PA_SUSPEND_IDLE); /* needed before rate update, will be resumed automatically */
}
if (s->update_rate(s, desired_rate) == TRUE) {
/* update monitor source as well */
if (s->monitor_source)
pa_source_update_rate(s->monitor_source, desired_rate);
pa_log_info("Changed sampling rate successfully");
return TRUE;
}
}
return FALSE;
}
/* Called from main thread */
pa_usec_t pa_sink_get_latency(pa_sink *s) {
pa_usec_t usec = 0;