+void
+EngineControl::connect_changed_signals ()
+{
+ backend_combo_connection = backend_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::backend_changed));
+ driver_combo_connection = driver_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::driver_changed));
+ sample_rate_combo_connection = sample_rate_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::sample_rate_changed));
+ buffer_size_combo_connection = buffer_size_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::buffer_size_changed));
+ nperiods_combo_connection = nperiods_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::nperiods_changed));
+ device_combo_connection = device_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::device_changed));
+ midi_option_combo_connection = midi_option_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::midi_option_changed));
+
+ input_device_combo_connection = input_device_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::input_device_changed));
+ output_device_combo_connection = output_device_combo.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::output_device_changed));
+
+ input_latency_connection = input_latency.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::parameter_changed));
+ output_latency_connection = output_latency.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::parameter_changed));
+ input_channels_connection = input_channels.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::parameter_changed));
+ output_channels_connection = output_channels.signal_changed ().connect (
+ sigc::mem_fun (*this, &EngineControl::parameter_changed));
+}
+
+void
+EngineControl::block_changed_signals ()
+{
+ if (block_signals++ == 0) {
+ DEBUG_ECONTROL ("Blocking changed signals");
+ backend_combo_connection.block ();
+ driver_combo_connection.block ();
+ sample_rate_combo_connection.block ();
+ buffer_size_combo_connection.block ();
+ nperiods_combo_connection.block ();
+ device_combo_connection.block ();
+ input_device_combo_connection.block ();
+ output_device_combo_connection.block ();
+ midi_option_combo_connection.block ();
+ input_latency_connection.block ();
+ output_latency_connection.block ();
+ input_channels_connection.block ();
+ output_channels_connection.block ();
+ }
+}
+
+void
+EngineControl::unblock_changed_signals ()
+{
+ if (--block_signals == 0) {
+ DEBUG_ECONTROL ("Unblocking changed signals");
+ backend_combo_connection.unblock ();
+ driver_combo_connection.unblock ();
+ sample_rate_combo_connection.unblock ();
+ buffer_size_combo_connection.unblock ();
+ nperiods_combo_connection.unblock ();
+ device_combo_connection.unblock ();
+ input_device_combo_connection.unblock ();
+ output_device_combo_connection.unblock ();
+ midi_option_combo_connection.unblock ();
+ input_latency_connection.unblock ();
+ output_latency_connection.unblock ();
+ input_channels_connection.unblock ();
+ output_channels_connection.unblock ();
+ }
+}
+
+EngineControl::SignalBlocker::SignalBlocker (EngineControl& engine_control,
+ const std::string& reason)
+ : ec (engine_control)
+ , m_reason (reason)
+{
+ DEBUG_ECONTROL (string_compose ("SignalBlocker: %1", m_reason));
+ ec.block_changed_signals ();
+}
+
+EngineControl::SignalBlocker::~SignalBlocker ()
+{
+ DEBUG_ECONTROL (string_compose ("~SignalBlocker: %1", m_reason));
+ ec.unblock_changed_signals ();
+}
+
+void
+EngineControl::on_show ()
+{
+ ArdourDialog::on_show ();
+ if (!ARDOUR::AudioEngine::instance()->current_backend() || !ARDOUR::AudioEngine::instance()->running()) {
+ // re-check _have_control (jackd running) see #6041
+ backend_changed ();
+ }
+ device_changed ();
+ ok_button->grab_focus();
+}
+
+bool
+EngineControl::try_autostart ()
+{
+ if (!start_stop_button.get_sensitive()) {
+ return false;
+ }
+ if (ARDOUR::AudioEngine::instance()->running()) {
+ return true;
+ }
+ return start_engine ();
+}
+
+bool
+EngineControl::start_engine ()
+{
+ if (push_state_to_backend(true) != 0) {
+ MessageDialog msg(*this,
+ ARDOUR::AudioEngine::instance()->get_last_backend_error());
+ msg.run();
+ return false;
+ }
+ return true;
+}