stream_class->event_classes = g_ptr_array_new_with_free_func(
(GDestroyNotify) bt_object_try_spec_release);
if (!stream_class->event_classes) {
stream_class->event_classes = g_ptr_array_new_with_free_func(
(GDestroyNotify) bt_object_try_spec_release);
if (!stream_class->event_classes) {