pulse-server: improve sink/source state

When a sink is RUNNING but there is nothing linked to the input it must
be the monitor that is keeping it active, report IDLE for the sink in
that case.

When a source is RUNNING but there is nothing linked to the output it
must be the sink part that is keeping it active, report IDLE for the
source.

Fixes #1345

src/modules/module-protocol-pulse/collect.c

@@ -71,6 +71,30 @@ struct pw_manager_object *select_object(struct pw_manager *m, struct selector *s
 	return s->best;
 }
 
+bool collect_is_linked(struct pw_manager *m, uint32_t obj_id, enum pw_direction direction)
+{
+	struct pw_manager_object *o;
+	const char *str;
+	uint32_t in_node, out_node;
+
+	spa_list_for_each(o, &m->object_list, link) {
+		if (o->props == NULL || !pw_manager_object_is_link(o))
+			continue;
+
+		if ((str = pw_properties_get(o->props, PW_KEY_LINK_OUTPUT_NODE)) == NULL)
+                        continue;
+		out_node = pw_properties_parse_int(str);
+                if ((str = pw_properties_get(o->props, PW_KEY_LINK_INPUT_NODE)) == NULL)
+                        continue;
+		in_node = pw_properties_parse_int(str);
+
+		if ((direction == PW_DIRECTION_OUTPUT && obj_id == out_node) ||
+		    (direction == PW_DIRECTION_INPUT && obj_id == in_node))
+			return true;
+	}
+	return false;
+}
+
 struct pw_manager_object *find_linked(struct pw_manager *m, uint32_t obj_id, enum pw_direction direction)
 {
 	struct pw_manager_object *o, *p;

src/modules/module-protocol-pulse/collect.h

@@ -155,5 +155,6 @@ struct spa_dict *collect_props(struct spa_pod *info, struct spa_dict *dict);
 uint32_t find_profile_id(struct pw_manager_object *card, const char *name);
 uint32_t find_port_id(struct pw_manager_object *card, uint32_t direction, const char *port_name);
 struct pw_manager_object *find_linked(struct pw_manager *m, uint32_t obj_id, enum pw_direction direction);
+bool collect_is_linked(struct pw_manager *m, uint32_t obj_id, enum pw_direction direction);
 
 #endif

src/modules/module-protocol-pulse/pulse-server.c

@@ -3467,9 +3467,17 @@ static int fill_sink_info(struct client *client, struct message *m,
 			TAG_INVALID);
 	}
 	if (client->version >= 15) {
+		bool is_linked = collect_is_linked(manager, o->id, SPA_DIRECTION_INPUT);
+		int state = node_state(info->state);
+
+		/* running with nothing linked is probably the monitor that is
+		 * keeping this sink busy */
+		if (state == STATE_RUNNING && !is_linked)
+			state = STATE_IDLE;
+
 		message_put(m,
 			TAG_VOLUME, dev_info.volume_info.base,	/* base volume */
-			TAG_U32, node_state(info->state),	/* state */
+			TAG_U32, state,				/* state */
 			TAG_U32, dev_info.volume_info.steps,	/* n_volume_steps */
 			TAG_U32, card_id,			/* card index */
 			TAG_INVALID);
@@ -3611,9 +3619,17 @@ static int fill_source_info(struct client *client, struct message *m,
 			TAG_INVALID);
 	}
 	if (client->version >= 15) {
+		bool is_linked = collect_is_linked(manager, o->id, SPA_DIRECTION_OUTPUT);
+		int state = node_state(info->state);
+
+		/* running with nothing linked is probably the sink that is
+		 * keeping this source busy */
+		if (state == STATE_RUNNING && !is_linked)
+			state = STATE_IDLE;
+
 		message_put(m,
 			TAG_VOLUME, dev_info.volume_info.base,	/* base volume */
-			TAG_U32, node_state(info->state),	/* state */
+			TAG_U32, state,				/* state */
 			TAG_U32, dev_info.volume_info.steps,	/* n_volume_steps */
 			TAG_U32, card_id,			/* card index */
 			TAG_INVALID);