node: add enabled state

Add method to enable/disable a node. Disabled nodes will SUSPEND and not
be available for automatic connections, it is intented for handling
the monitor node state.

src/pipewire/core.c

@@ -610,6 +610,9 @@ struct pw_port *pw_core_find_port(struct pw_core *core,
 		    !PW_PERM_IS_R(pw_global_get_permissions(n->global, core->current_client)))
 			continue;
 
+		if (!n->enabled)
+			continue;
+
 		pw_log_debug("node id \"%d\"", n->global->id);
 
 		if (have_id) {

src/pipewire/node.c

@@ -394,6 +394,7 @@ struct pw_node *pw_node_new(struct pw_core *core,
 	if (properties == NULL)
 		goto no_mem;
 
+	this->enabled = true;
 	this->properties = properties;
 
 	impl->work = pw_work_queue_new(this->core->main_loop);
@@ -882,8 +883,10 @@ int pw_node_set_active(struct pw_node *node, bool active)
 		pw_log_debug("node %p: %s", node, active ? "activate" : "deactivate");
 		node->active = active;
 		spa_hook_list_call(&node->listener_list, struct pw_node_events, active_changed, active);
-		if (active)
+		if (active) {
-			node_activate(node);
+			if (node->enabled)
+				node_activate(node);
+		}
 		else
 			pw_node_set_state(node, PW_NODE_STATE_IDLE);
 	}
@@ -894,3 +897,28 @@ bool pw_node_is_active(struct pw_node *node)
 {
 	return node->active;
 }
+
+int pw_node_set_enabled(struct pw_node *node, bool enabled)
+{
+	bool old = node->enabled;
+
+	if (old != enabled) {
+		pw_log_debug("node %p: %s", node, enabled ? "enable" : "disable");
+		node->enabled = enabled;
+		spa_hook_list_call(&node->listener_list, struct pw_node_events, enabled_changed, enabled);
+
+		if (enabled) {
+			if (node->active)
+				node_activate(node);
+		}
+		else {
+			pw_node_set_state(node, PW_NODE_STATE_SUSPENDED);
+		}
+	}
+	return 0;
+}
+
+bool pw_node_is_enabled(struct pw_node *node)
+{
+	return node->enabled;
+}

src/pipewire/node.h

@@ -68,6 +68,8 @@ struct pw_node_events {
 	void (*info_changed) (void *data, struct pw_node_info *info);
 	/** the node active state changed */
 	void (*active_changed) (void *data, bool active);
+	/** the node enabled state changed */
+	void (*enabled_changed) (void *data, bool enabled);
 
 	/** a new state is requested on the node */
 	void (*state_request) (void *data, enum pw_node_state state);
@@ -164,9 +166,15 @@ struct pw_port * pw_node_get_free_port(struct pw_node *node, enum pw_direction d
   * nodes and start data transport */
 int pw_node_set_active(struct pw_node *node, bool active);
 
-/** Check is a node is active */
+/** Check if a node is active */
 bool pw_node_is_active(struct pw_node *node);
 
+/** Set a node enabled. The node will be able to be activated */
+int pw_node_set_enabled(struct pw_node *node, bool enabled);
+
+/** Check if a node is enabled */
+bool pw_node_is_enabled(struct pw_node *node);
+
 #ifdef __cplusplus
 }
 #endif

src/pipewire/private.h

@@ -243,6 +243,7 @@ struct pw_node {
 
 	struct pw_node_info info;		/**< introspectable node info */
 
+	bool enabled;			/**< if the node is enabled */
 	bool active;			/**< if the node is active */
 	bool live;			/**< if the node is live */
 	struct spa_clock *clock;	/**< handle to SPA clock if any */