cue events: some basic handling framework for syncing cue markers with session events that implement them

This doesn't actually do anything yet

libs/ardour/ardour/session.h

@@ -2299,6 +2299,8 @@ private:
 	GATOMIC_QUAL gint _update_pretty_names;
 
 	void setup_thread_local_variables ();
+	void cue_marker_change (Location*);
+	void sync_cues ();
 };
 
 

libs/ardour/ardour/session_event.h

@@ -68,6 +68,7 @@ public:
 		EndRoll,
 		TransportStateChange,
 		TriggerSceneChange,
+		SyncCues,
 
 		/* only one of each of these events can be queued at any one time */
 

libs/ardour/session.cc

@@ -483,6 +483,8 @@ Session::Session (AudioEngine &eng,
 
 	Controllable::ControlTouched.connect_same_thread (*this, boost::bind (&Session::controllable_touched, this, _1));
 
+	Location::cue_change.connect_same_thread (*this, boost::bind (&Session::cue_marker_change, this, _1));
+
 	emit_thread_start ();
 	auto_connect_thread_start ();
 
@@ -7366,3 +7368,10 @@ Session::had_destructive_tracks() const
 {
 	return _had_destructive_tracks;
 }
+
+void
+Session::cue_marker_change (Location* loc)
+{
+	SessionEvent* ev = new SessionEvent (SessionEvent::SyncCues, SessionEvent::Add, SessionEvent::Immediate, 0, 0.0);
+	queue_event (ev);
+}

libs/ardour/session_process.cc

@@ -1047,6 +1047,10 @@ Session::process_event (SessionEvent* ev)
 		g_atomic_int_set (&_suspend_timecode_transmission, ev->yes_or_no ? 0 : 1);
 		break;
 
+	case SessionEvent::SyncCues:
+		sync_cues ();
+		break;
+
 	default:
 	  fatal << string_compose(_("Programming error: illegal event type in process_event (%1)"), ev->type) << endmsg;
 		abort(); /*NOTREACHED*/
@@ -1580,3 +1584,9 @@ Session::implement_master_strategy ()
 
 	return true;
 }
+
+void
+Session::sync_cues ()
+{
+}
+