From 0a8ab08e5f02b47e82343554b20e317e1b21731d Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 19 Oct 2016 15:13:32 -0400
Subject: basics of following MIDI track selection and rewiring input

---
 libs/ardour/ardour/rc_configuration_vars.h |  1 +
 libs/ardour/ardour/session.h               |  7 +++-
 libs/ardour/session.cc                     |  1 +
 libs/ardour/session_midi.cc                | 52 ++++++++++++++++++++++++++++++
 4 files changed, 60 insertions(+), 1 deletion(-)

(limited to 'libs/ardour')

diff --git a/libs/ardour/ardour/rc_configuration_vars.h b/libs/ardour/ardour/rc_configuration_vars.h
index ae6f7af93b..62a15a3fe2 100644
--- a/libs/ardour/ardour/rc_configuration_vars.h
+++ b/libs/ardour/ardour/rc_configuration_vars.h
@@ -59,6 +59,7 @@ CONFIG_VARIABLE (int32_t, mmc_send_device_id, "mmc-send-device-id", 0)
 CONFIG_VARIABLE (int32_t, initial_program_change, "initial-program-change", -1)
 CONFIG_VARIABLE (bool, first_midi_bank_is_zero, "display-first-midi-bank-as-zero", false)
 CONFIG_VARIABLE (int32_t, inter_scene_gap_frames, "inter-scene-gap-frames", 1)
+CONFIG_VARIABLE (bool, midi_input_follows_selection, "midi-input-follows-selection", 1)
 
 /* Timecode and related */
 
diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index d76c65c675..4b17d7d855 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -593,7 +593,7 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 				}
 			}
 		}
-	                                        private:
+            private:
 		Session * _session;
 	};
 
@@ -1151,6 +1151,7 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 
 	void auto_connect_thread_wakeup ();
 
+
   protected:
 	friend class AudioEngine;
 	void set_block_size (pframes_t nframes);
@@ -2033,6 +2034,10 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 	boost::shared_ptr<Route> get_midi_nth_route_by_id (PresentationInfo::order_t n) const;
 
 	std::string created_with;
+
+	void midi_track_presentation_info_changed (PBD::PropertyChange const &, boost::weak_ptr<MidiTrack>);
+	void rewire_selected_midi (boost::shared_ptr<MidiTrack>);
+	boost::weak_ptr<MidiTrack> current_midi_target;
 };
 
 
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index f89440b86a..8313c215ef 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -3474,6 +3474,7 @@ Session::add_routes_inner (RouteList& new_routes, bool input_auto_connect, bool
 			if (mt) {
 				mt->StepEditStatusChange.connect_same_thread (*this, boost::bind (&Session::step_edit_status_change, this, _1));
 				mt->output()->changed.connect_same_thread (*this, boost::bind (&Session::midi_output_change_handler, this, _1, _2, boost::weak_ptr<Route>(mt)));
+				mt->presentation_info().PropertyChanged.connect_same_thread (*this, boost::bind (&Session::midi_track_presentation_info_changed, this, _1, boost::weak_ptr<MidiTrack>(mt)));
 			}
 		}
 
diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc
index fa23880b87..5ed2b05e9a 100644
--- a/libs/ardour/session_midi.cc
+++ b/libs/ardour/session_midi.cc
@@ -722,3 +722,55 @@ Session::mtc_input_port () const
 {
 	return _midi_ports->mtc_input_port ();
 }
+
+void
+Session::midi_track_presentation_info_changed (PropertyChange const& what_changed, boost::weak_ptr<MidiTrack> mt)
+{
+	if (!Config->get_midi_input_follows_selection()) {
+		return;
+	}
+
+	if (!what_changed.contains (Properties::selected)) {
+		return;
+	}
+
+	boost::shared_ptr<MidiTrack> new_midi_target (mt.lock ());
+
+	if (new_midi_target->presentation_info().selected()) {
+		rewire_selected_midi (new_midi_target);
+	}
+}
+
+void
+Session::rewire_selected_midi (boost::shared_ptr<MidiTrack> new_midi_target)
+{
+	if (!new_midi_target) {
+		return;
+	}
+
+	boost::shared_ptr<MidiTrack> old_midi_target = current_midi_target.lock ();
+
+	if (new_midi_target == old_midi_target) {
+		return;
+	}
+
+	PortManager::MidiSelectionPorts msp;
+
+	AudioEngine::instance()->get_midi_selection_ports (msp);
+
+	if (msp.empty()) {
+		return;
+	}
+
+	if (old_midi_target) {
+		for (PortManager::MidiSelectionPorts::const_iterator p = msp.begin(); p != msp.end(); ++p) {
+			old_midi_target->input()->disconnect (old_midi_target->input()->nth (0), (*p), this);
+		}
+	}
+
+	for (PortManager::MidiSelectionPorts::const_iterator p = msp.begin(); p != msp.end(); ++p) {
+		new_midi_target->input()->connect (new_midi_target->input()->nth(0), (*p), this);
+	}
+
+	current_midi_target = new_midi_target;
+}
-- 
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