+
+vector<string>
+JACKAudioBackend::enumerate_midi_options () const
+{
+ return ARDOUR::enumerate_midi_options ();
+}
+
+int
+JACKAudioBackend::set_midi_option (const string& opt)
+{
+ _target_midi_option = opt;
+ return 0;
+}
+
+bool
+JACKAudioBackend::speed_and_position (double& speed, framepos_t& position)
+{
+ jack_position_t pos;
+ jack_transport_state_t state;
+ bool starting;
+
+ /* this won't be called if the port engine in use is not JACK, so we do
+ not have to worry about the type of PortEngine::private_handle()
+ */
+
+ speed = 0;
+ position = 0;
+
+ GET_PRIVATE_JACK_POINTER_RET (_priv_jack, true);
+
+ state = jack_transport_query (_priv_jack, &pos);
+
+ switch (state) {
+ case JackTransportStopped:
+ speed = 0;
+ starting = false;
+ break;
+ case JackTransportRolling:
+ speed = 1.0;
+ starting = false;
+ break;
+ case JackTransportLooping:
+ speed = 1.0;
+ starting = false;
+ break;
+ case JackTransportStarting:
+ starting = true;
+ // don't adjust speed here, just leave it as it was
+ break;
+ default:
+ std::cerr << "WARNING: Unknown JACK transport state: " << state << std::endl;
+ }
+
+ position = pos.frame;
+ return starting;
+}