agl_node *agl_node_create (struct userdata *, agl_node *);
const char *agl_node_type_str (agl_node_type);
agl_node *agl_node_create (struct userdata *, agl_node *);
const char *agl_node_type_str (agl_node_type);
agl_node *agl_node_get_from_data (struct userdata *, agl_direction, void *);
agl_node *agl_node_get_from_client (struct userdata *, pa_client *);
agl_node *agl_node_get_from_data (struct userdata *, agl_direction, void *);
agl_node *agl_node_get_from_client (struct userdata *, pa_client *);