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sink-input, source-output: Add hooks for preferred device changes

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The hooks are fired when the preferred device changes. This is useful
for module-stream-restore.

I added new set_preferred_sink/source() functions for firing the hooks.
The functions also log the preferred device changes.

There was already pa_sink_input_set_preferred_sink(), but that had a
side effect of moving the stream, so I needed a new function. Since it
can be confusing when the two similarly named functions should be
called, I added a comment for pa_sink_input_set_preferred_sink() that
explains the different situations.

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/535>
This commit is contained in:
Tanu Kaskinen 2021-04-05 17:13:27 +03:00 • committed by PulseAudio Marge Bot
parent 1f204a1357
commit 737ebcdfdb
3 changed files with 72 additions and 14 deletions
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42
src/pulsecore/source-output.c
View file

@ -1531,6 +1531,22 @@ static void update_volume_due_to_moving(pa_source_output *o, pa_source *dest) {
pa_source_set_volume(o->source, NULL, false, o->save_volume);
}
/* Called from the main thread. */
static void set_preferred_source(pa_source_output *o, const char *source_name) {
pa_assert(o);
if (pa_safe_streq(o->preferred_source, source_name))
return;
pa_log_debug("Source output %u: preferred_source: %s -> %s",
o->index, o->preferred_source ? o->preferred_source : "(unset)", source_name ? source_name : "(unset)");
pa_xfree(o->preferred_source);
o->preferred_source = pa_xstrdup(source_name);
pa_subscription_post(o->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT | PA_SUBSCRIPTION_EVENT_CHANGE, o->index);
pa_hook_fire(&o->core->hooks[PA_CORE_HOOK_SOURCE_OUTPUT_PREFERRED_SOURCE_CHANGED], o);
}
/* Called from main context */
int pa_source_output_finish_move(pa_source_output *o, pa_source *dest, bool save) {
pa_source_output_assert_ref(o);
@ -1570,11 +1586,10 @@ int pa_source_output_finish_move(pa_source_output *o, pa_source *dest, bool save
/* save == true, means user is calling the move_to() and want to
save the preferred_source */
if (save) {
pa_xfree(o->preferred_source);
if (dest == dest->core->default_source)
o->preferred_source = NULL;
set_preferred_source(o, NULL);
else
o->preferred_source = pa_xstrdup(dest->name);
set_preferred_source(o, dest->name);
}
pa_idxset_put(o->source->outputs, pa_source_output_ref(o), NULL);
@ -1907,16 +1922,29 @@ void pa_source_output_set_reference_ratio(pa_source_output *o, const pa_cvolume
pa_cvolume_snprint_verbose(new_ratio_str, sizeof(new_ratio_str), ratio, &o->channel_map, true));
}
/* Called from the main thread. */
/* Called from the main thread.
*
* This is called when e.g. module-stream-restore wants to change the preferred
* source. As a side effect the stream is moved to the new preferred source.
* Note that things can work also in the other direction: if the user moves
* a stream, as a side effect the preferred source is changed. This could cause
* an infinite loop, but it's avoided by these two measures:
* - When pa_source_output_set_preferred_source() is called, it calls
* pa_source_output_move_to() with save=false, which avoids the recursive
* pa_source_output_set_preferred_source() call.
* - When the primary operation is to move a stream,
* pa_source_output_finish_move() calls set_preferred_source() instead of
* pa_source_output_set_preferred_source(). set_preferred_source() doesn't
* move the stream as a side effect.
*/
void pa_source_output_set_preferred_source(pa_source_output *o, pa_source *s) {
pa_assert(o);
pa_xfree(o->preferred_source);
if (s) {
o->preferred_source = pa_xstrdup(s->name);
set_preferred_source(o, s->name);
pa_source_output_move_to(o, s, false);
} else {
o->preferred_source = NULL;
set_preferred_source(o, NULL);
pa_source_output_move_to(o, o->core->default_source, false);
}
}