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sink-input: Ensure no volumes are applied for passthrough streams

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This forces passthrough sink-inputs and their corresponding sinks to 0dB
gain so that the data is sent unaltered to the receiver.
This commit is contained in:
Arun Raghavan 2011-08-18 11:51:12 +05:30
parent b08237b6c6
commit 0dea35a818
3 changed files with 56 additions and 21 deletions
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35
src/pulsecore/sink.c
View file

@ -1394,6 +1394,35 @@ pa_bool_t pa_sink_is_passthrough(pa_sink *s) {
return FALSE;
}
/* Called from main context */
void pa_sink_enter_passthrough(pa_sink *s) {
pa_cvolume volume;
/* disable the monitor in passthrough mode */
if (s->monitor_source)
pa_source_suspend(s->monitor_source, TRUE, PA_SUSPEND_PASSTHROUGH);
/* set the volume to NORM */
s->saved_volume = *pa_sink_get_volume(s, TRUE);
s->saved_save_volume = s->save_volume;
pa_cvolume_set(&volume, s->sample_spec.channels, PA_VOLUME_NORM);
pa_sink_set_volume(s, &volume, TRUE, FALSE);
}
/* Called from main context */
void pa_sink_leave_passthrough(pa_sink *s) {
/* Unsuspend monitor */
if (s->monitor_source)
pa_source_suspend(s->monitor_source, FALSE, PA_SUSPEND_PASSTHROUGH);
/* Restore sink volume to what it was before we entered passthrough mode */
pa_sink_set_volume(s, &s->saved_volume, TRUE, s->saved_save_volume);
pa_cvolume_init(&s->saved_volume);
s->saved_save_volume = FALSE;
}
/* Called from main context. */
static void compute_reference_ratio(pa_sink_input *i) {
unsigned c = 0;
@ -1784,9 +1813,9 @@ void pa_sink_set_volume(
pa_assert(volume || pa_sink_flat_volume_enabled(s));
pa_assert(!volume || volume->channels == 1 || pa_cvolume_compatible(volume, &s->sample_spec));
/* make sure we don't change the volume when a PASSTHROUGH input is connected */
if (pa_sink_is_passthrough(s)) {
/* FIXME: Need to notify client that volume control is disabled */
/* make sure we don't change the volume when a PASSTHROUGH input is connected ...
* ... *except* if we're being invoked to reset the volume to ensure 0 dB gain */
if (pa_sink_is_passthrough(s) && (!volume || !pa_cvolume_is_norm(volume))) {
pa_log_warn("Cannot change volume, Sink is connected to PASSTHROUGH input");
return;
}