Added MidiControlListener for controlling LMMS via MIDI

MidiControlListener is MidiEventProcessor that listens for specific
MIDI events in order to control LMMS' transportation (currently only
start/stop). Can be advanced later to control other things in LMMS.

include/engine.h

@@ -50,6 +50,7 @@ class song;
 class songEditor;
 class ladspa2LMMS;
 class controllerRackView;
+class MidiControlListener;
 
 
 class EXPORT engine
@@ -195,6 +196,7 @@ private:
 	static projectJournal * s_projectJournal;
 	static dummyTrackContainer * s_dummyTC;
 	static controllerRackView * s_controllerRackView;
+	static MidiControlListener * s_midiControlListener;
 
 	// GUI
 	static mainWindow * s_mainWindow;

include/midi_control_listener.h

@@ -0,0 +1,72 @@
+/*
+ * midi_control_listener.h - listens to MIDI source(s) for commands that
+ *                           start/stops LMMS' transportation,
+ *                           or toggles loop
+ *
+ * Copyright (c) 2009 Achim Settelmeier <lmms/at/m1.sirlab.de>
+ *
+ * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef _MIDI_CONTROL_LISTENER_H
+#define _MIDI_CONTROL_LISTENER_H
+
+#include "midi_event_processor.h"
+#include "midi_port.h"
+#include "note.h"
+
+class MidiControlListener : public midiEventProcessor
+{
+public:
+	typedef enum
+	{
+		ActionNone = 0,
+		ActionPlay,
+		ActionStop
+	} EventAction;
+	typedef QMap<int, EventAction> ActionMap;
+
+	MidiControlListener();
+	virtual ~MidiControlListener();
+
+	virtual void processInEvent( const midiEvent & _me,
+						const midiTime & _time );
+	virtual void processOutEvent( const midiEvent & _me,
+				     const midiTime & _time )
+	{
+	}
+
+private:
+	void act( EventAction _action );
+
+
+	midiPort m_port;
+
+	bool m_controlKeyPressed;  // flag, whether the control key is pressed
+
+	// configuration
+	bool m_useControlKey;      // true: use control key (two key sequence); false: single key sequence
+	int m_controlKey;          // number of the control key (0 - NumKeys)
+	int m_controlChannel;      // number of channel (0 - 15) or -1 for all channels
+	ActionMap m_actionMapKeys;
+	ActionMap m_actionMapControllers;
+} ;
+
+#endif
+