+
+void
+EngineControl::on_switch_page (GtkNotebookPage*, guint page_num)
+{
+ if (page_num == 0) {
+ cancel_button->set_sensitive (true);
+ ok_button->set_sensitive (true);
+ apply_button->set_sensitive (true);
+ } else {
+ cancel_button->set_sensitive (false);
+ ok_button->set_sensitive (false);
+ apply_button->set_sensitive (false);
+ }
+
+ if (page_num == 1) {
+ /* MIDI tab */
+ refresh_midi_display ();
+ }
+
+ if (page_num == 2) {
+ /* latency tab */
+
+ if (!ARDOUR::AudioEngine::instance()->running()) {
+
+ PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1);
+
+ /* save any existing latency values */
+
+ uint32_t il = (uint32_t) input_latency.get_value ();
+ uint32_t ol = (uint32_t) input_latency.get_value ();
+
+ /* reset to zero so that our new test instance of JACK
+ will be clean of any existing latency measures.
+ */
+
+ input_latency.set_value (0);
+ output_latency.set_value (0);
+
+ /* reset control */
+
+ input_latency.set_value (il);
+ output_latency.set_value (ol);
+
+ }
+
+ if (ARDOUR::AudioEngine::instance()->prepare_for_latency_measurement()) {
+ disable_latency_tab ();
+ }
+
+ enable_latency_tab ();
+
+ } else {
+ ARDOUR::AudioEngine::instance()->stop_latency_detection();
+ }
+}
+
+/* latency measurement */
+
+bool
+EngineControl::check_latency_measurement ()
+{
+ MTDM* mtdm = ARDOUR::AudioEngine::instance()->mtdm ();
+
+ if (mtdm->resolve () < 0) {
+ lm_results.set_markup (string_compose ("<span foreground=\"red\">%1</span>", _("No signal detected ")));
+ return true;
+ }
+
+ if (mtdm->err () > 0.3) {
+ mtdm->invert ();
+ mtdm->resolve ();
+ }
+
+ char buf[128];
+ ARDOUR::framecnt_t const sample_rate = ARDOUR::AudioEngine::instance()->sample_rate();
+
+ if (sample_rate == 0) {
+ lm_results.set_text (_("Disconnected from audio engine"));
+ ARDOUR::AudioEngine::instance()->stop_latency_detection ();
+ return false;
+ }
+
+ uint32_t frames_total = mtdm->del();
+ uint32_t extra = frames_total - ARDOUR::AudioEngine::instance()->latency_signal_delay();
+
+ snprintf (buf, sizeof (buf), "%u samples %10.3lf ms", extra, extra * 1000.0f/sample_rate);
+
+ bool solid = true;
+
+ if (mtdm->err () > 0.2) {
+ strcat (buf, " ??");
+ solid = false;
+ }
+
+ if (mtdm->inv ()) {
+ strcat (buf, " (Inv)");
+ solid = false;
+ }
+
+ if (solid) {
+ lm_measure_button.set_active (false);
+ lm_use_button.set_sensitive (true);
+ strcat (buf, " (set)");
+ have_lm_results = true;
+ }
+
+ lm_results.set_text (buf);
+
+ return true;
+}
+
+void
+EngineControl::start_latency_detection ()
+{
+ ARDOUR::AudioEngine::instance()->set_latency_input_port (lm_input_channel_combo.get_active_text());
+ ARDOUR::AudioEngine::instance()->set_latency_output_port (lm_output_channel_combo.get_active_text());
+ ARDOUR::AudioEngine::instance()->start_latency_detection ();
+ lm_results.set_text (_("Detecting ..."));
+ latency_timeout = Glib::signal_timeout().connect (mem_fun (*this, &EngineControl::check_latency_measurement), 250);
+ lm_start_stop_label.set_text (_("Cancel measurement"));
+ have_lm_results = false;
+ lm_input_channel_combo.set_sensitive (false);
+ lm_output_channel_combo.set_sensitive (false);
+}
+
+void
+EngineControl::end_latency_detection ()
+{
+ ARDOUR::AudioEngine::instance()->stop_latency_detection ();
+ latency_timeout.disconnect ();
+ lm_start_stop_label.set_text (_("Measure latency"));
+ if (!have_lm_results) {
+ lm_results.set_markup ("<i>No measurement results yet</i>");
+ }
+ lm_input_channel_combo.set_sensitive (true);
+ lm_output_channel_combo.set_sensitive (true);
+}
+
+void
+EngineControl::latency_button_toggled ()
+{
+ if (lm_measure_button.get_active ()) {
+ start_latency_detection ();
+ } else {
+ end_latency_detection ();
+ }
+}
+
+void
+EngineControl::use_latency_button_clicked ()
+{
+ MTDM* mtdm = ARDOUR::AudioEngine::instance()->mtdm ();
+
+ if (!mtdm) {
+ return;
+ }
+
+ uint32_t frames_total = mtdm->del();
+ uint32_t extra = frames_total - ARDOUR::AudioEngine::instance()->latency_signal_delay();
+ uint32_t one_way = extra/2;
+
+ input_latency_adjustment.set_value (one_way);
+ output_latency_adjustment.set_value (one_way);
+}
+
+bool
+EngineControl::on_delete_event (GdkEventAny* ev)
+{
+ if (notebook.get_current_page() == 2) {
+ /* currently on latency tab - be sure to clean up */
+ end_latency_detection ();
+ }
+ return ArdourDialog::on_delete_event (ev);
+}
+