+typedef void (EmpathyTpTubeReadyCb)
+ (EmpathyTpTube *tube, const GError *error, gpointer user_data,
+ GObject *weak_object);
+
+void empathy_tp_tube_call_when_ready (EmpathyTpTube *tube,
+ EmpathyTpTubeReadyCb *callback, gpointer user_data, GDestroyNotify destroy,
+ GObject *weak_object);
+