X-Git-Url: https://ruin.nu/git/?a=blobdiff_plain;f=Moosique.java;h=e2b7f3e490821832347b01fae8c9289f9eff228a;hb=1d2d2bfd14ba0addab97692527d4414d3a87e13d;hp=42c5e2e03fea09b18c15c566d3fa044502107d01;hpb=ade446bcfe30be5e4a058926387763f72fc3d4a7;p=moosique.git

diff --git a/Moosique.java b/Moosique.java
index 42c5e2e..e2b7f3e 100644
--- a/Moosique.java
+++ b/Moosique.java
@@ -1,117 +1,856 @@
 import javax.sound.midi.*;
 import java.io.*;
-// Import external MIDIFileReader and MIDIFileWriter
+import javax.swing.*;
+import java.util.*;
 
-/*
+/**
  * Moosique - The MIDI Tracker
  * 
- * Main class that handles initiation, IO and sound FX.
+ * Main class that handles initiation, IO and sound.
  * 
- * @author  Andersson, Andreen, Lanneskog, Pehrson
- * @version 1
+ * @author  Einar Pehrson
  */
  
 public class Moosique {
 
 	private static MooGUI gui;
-	private static MooSequence mooSeq;
 	private static Sequence seq;
-	private static Sequencer sequencer = null;
-	private static String filename;
-	private static int position;
+	private static Sequencer sequencer;
+	private static Synthesizer synthesizer;
+	private static Receiver receiver;
+	private static MidiChannel[] channels;
+	private static MidiChannel activeChannel;
 
-	/* 
+	private static ArrayList copyBuffer, emptyTracks, timeSignatures, tempoChanges;
+	private static Map trackMute = new HashMap();
+	private static Map trackSolo = new HashMap();
+	private static Thread player;
+
+	private static File file = null;
+	private static long editPosition;
+	private static boolean makeGUI = true, initSound = true, edited = false, drawEmptyTracks = false;
+	public static final int DEFAULT_RESOLUTION = 96, DEFAULT_TRACKS = 4;
+	public static final int WHOLE_NOTE = 0, HALF_NOTE = 1, QUARTER_NOTE = 2, EIGHTH_NOTE = 3, SIXTEENTH_NOTE = 4;
+
+	/** 
 	 * Starts the application.
+	 * 
+	 * Parses command-line arguments, acquires MIDI devices and connects them,
+	 * loads a sequence and creates the GUI.
 	 */
 	public static void main (String[] args) {
-		// Creates song and GUI
-		seq = new MooSequence();
-		gui = new MooGUI(mooSeq);
+		out("\nMoosique version 1.0\n");
 
-		// Initializes MIDI sequencer
+		// Parses command-line arguments.
+		String fileArg = null;
+		for (int i = 0; i < args.length; i++) {
+			if (args[i].equals("-n")) makeGUI = false;
+			else if (fileArg == null) fileArg = args[i];
+		}
+
+		// Acquires MIDI devices and connects them.
+		System.out.print("Initializing MIDI devices.");
 		try {
+			// Configures sequencer
 			sequencer = MidiSystem.getSequencer();
+			System.out.print(".");
 			sequencer.open();
+			sequencer.addMetaEventListener(new SongEndListener());
+
+			// Configures synthesizer
+			synthesizer = MidiSystem.getSynthesizer();
+			System.out.print(".");
+			synthesizer.open();
+
+			// Configures receiver, transmitter and channels.
+			receiver = synthesizer.getReceiver();
+			sequencer.getTransmitter().setReceiver(receiver);
+			channels = synthesizer.getChannels();
+			setActiveChannel(0);
 		} catch (MidiUnavailableException e) {
-			System.exit(0);
+			out("Failed, quitting.");
+			System.exit(1);
+		}
+		out("Done");
+
+		// Loads user preferences (work directory, last opened files etc).
+		loadPreferences();
+
+		//If a filename is given as the command-line argument, attempts to load a sequence from the file.
+		if (fileArg != null) {
+			System.out.print("Loading MIDI sequence from " + fileArg + "...");
+			if (!load(new File(fileArg))) {
+				out("Failed, creating new sequence");
+				clearSequence();
+			} else {
+				out("Done");
+			}
+		} else {
+			// Otherwise creates a new empty one.
+			clearSequence();
+		}
+
+		// Builds GUI, unless n-flag is set.
+		if (makeGUI) {
+			System.out.print("Building GUI.");
+			try {
+				UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+			} catch (Exception e) {}
+			gui = new MooGUI(seq, file);
+			out("Done");
+		} else {
+			System.out.print("Playing...");
+			play();
+			while (sequencer.isRunning()) {}
+			out("Done");
+			quit();
 		}
 	}
 
-	/* 
-	 * Returns a pointer to the current sequence.
+
+
+
+
+
+
+
+	/*				***
+	 **	  ACCESSOR METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Returns the currently active MidiChannel.
+	 * @return the active MidiChannel
+	 */
+	public static MidiChannel getActiveChannel() {
+		return activeChannel;
+	}
+
+	/** 
+	 * Returns the MidiChannels of the selected synthesizer.
+	 * @return the available MidiChannels
+	 */
+	public static MidiChannel getChannel(int i) {
+		return channels[i];
+	}
+
+	/** 
+	 * Returns the current copy buffer.
+	 * @return the current copy buffer
+	 */
+	public static ArrayList getCopyBuffer() {
+		return copyBuffer;
+	}
+
+	/** 
+	 * Returns the current editing position of the sequencer.
+	 * @return the tick position
+	 */
+	public static long getEditPosition() {
+		return editPosition;
+	}
+
+	/** 
+	 * Returns the GUI.
+	 * @return the GUI
+	 */
+	public static MooGUI getGUI() {
+		return gui;
+	}
+
+	/** 
+	 * Calculates the position (measures, beats, ticks) in the current sequence for the given tick position.
+	 * @return an array of integers where index 0 is measures, 1 is beats and 2 is ticks.
+	 */
+	public static int[] getPositionForTicks(long ticks) {
+		/*
+		int measures, beats, ticks;
+		for (int i = 0; i < timeSignatures.length; i++) {
+			long tick = timeSignatures[i].getTick();
+			// Split the ticks in the interval into measures, beats and ticks.
+		}
+		*/
+		int[] pos = {1, 1, 1};
+		return pos;
+	}
+
+	/** 
+	 * Returns the receiver of the current sequencer.
+	 * @return the receiver
+	 */
+	public static Receiver getReceiver() {
+		return receiver;
+	}
+
+	/** 
+	 * Returns the current sequence.
 	 * @return the current sequence
 	 */
-	public static MooSequence getSequence() {
-		return mooSeq;
+	public static Sequence getSequence() {
+		return seq;
+	}
+
+	/** 
+	 * Returns the current sequencer.
+	 * @return the current sequencer
+	 */
+	public static Sequencer getSequencer() {
+		return sequencer;
+	}
+
+	/** 
+	 * Returns the tempo in the given tick position.
+	 * @param tick the tick position for which to return the tempo
+	 * @return the tempo at the specified tick position
+	 */
+	public static int getTempo(long tick) {
+		if (tempoChanges.size() == 0) return 120;
+		MidiEvent tempoEvent = (MidiEvent)tempoChanges.get(0);
+		if (tempoChanges.size() > 1) {
+			for (int i = 1; i < tempoChanges.size(); i++) {
+				MidiEvent nextTempoEvent = (MidiEvent)tempoChanges.get(i);
+				if (nextTempoEvent.getTick() < tick && nextTempoEvent.getTick() > tempoEvent.getTick())
+					tempoEvent = nextTempoEvent;
+			}
+		}
+		return decodeTempo(((MetaMessage)tempoEvent.getMessage()).getData());
+	}
+
+	/** 
+	 * Calculates the tick position in the current sequence for the given position (measures, beats, ticks).
+	 * @return the tick position.
+	 */
+	public static long getTicksForPosition(int measures, int beats, int ticks) {
+		long tickPos = 0;
+		/*
+		for (int i = 0; i < timeSignatures.length; i++) {
+			long tick = timeSignatures[i].getTick();
+			// Add the measures, beats and ticks in the interval.
+		}
+		*/
+		return tickPos;
+	}
+
+	/** 
+	 * Returns the time signature in the given tick position.
+	 * @param tick the tick position for which to return the time signature
+	 * @return an array of two integers where [0] is the numerator and [1] the denominator
+	 */
+	public static int[] getTimeSig(long tick) {
+		int[] ts = {4, 4};
+		if (timeSignatures.size() == 0) return ts;
+		MidiEvent timeSigEvent = (MidiEvent)timeSignatures.get(0);
+		if (timeSignatures.size() > 1) {
+			for (int i = 1; i < timeSignatures.size(); i++) {
+				MidiEvent nextTimeSigEvent = (MidiEvent)timeSignatures.get(i);
+				if (nextTimeSigEvent.getTick() < tick && nextTimeSigEvent.getTick() > timeSigEvent.getTick())
+					timeSigEvent = nextTimeSigEvent;
+			}
+		}
+		return decodeTimeSig(((MetaMessage)timeSigEvent.getMessage()).getData());
+	}
+
+	/** 
+	 * Returns true if the current sequence has been edited.
+	 * @return the tick position
+	 */
+	public static boolean isEdited() {
+		return edited;
+	}
+
+	/** 
+	 * Returns whether the given track should be drawn
+	 * @return true if the given track should be drawn
+	 */
+	public static boolean shouldBeDrawn(Track track) {
+		if (drawEmptyTracks) return true;
+		else return (!emptyTracks.contains(track));
+	}
+
+
+
+
+
+
+
+
+	/*				***
+	 **	  MUTATOR METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Fast forwards the current sequence the given number of measures.
+	 * @param measures	the number of measures to fast forward
+	 */
+	public static void forward(long ticks) {
+		editPosition += ticks;
+	}
+
+	/** 
+	 * Rewinds the current sequence the given number of measures.
+	 * @param measures	the number of measures to rewind
+	 */
+	public static void rewind(long ticks) {
+		editPosition -= ticks;
+	}
+
+	/** 
+	 * Sets the currently active MidiChannel.
+	 * @param channel	the number of the MidiChannel to activate
+	 */
+	public static void setActiveChannel(int channel) {
+		activeChannel = channels[channel];
+	}
+
+	/** 
+	 * Sets the current copy buffer.
+	 * @param the copy buffer
+	 */
+	public static void setCopyBuffer(ArrayList buffer) {
+		copyBuffer = buffer;
+	}
+
+	/** 
+	 * Sets whether empty tracks should be drawn
+	 * @param state		true if empty tracks should be drawn
+	 */
+	public static void setDrawEmptyTracks(boolean state) {
+		drawEmptyTracks = state;
+	}
+
+	/** 
+	 * Sets the current sequence as edited, which implies prompts when loading a new sequence.
+	 */
+	public static void setEdited() {
+		edited = true;
+	}
+
+	/** 
+	 * Sets the current editing position of the sequencer.
+	 * @param ticks		the tick position
+	 */
+	public static void setEditPosition(long ticks) {
+		editPosition = ticks;
+	}
+
+	/** 
+	 * Sets the current editing position of the sequencer.
+	 * @param ticks		the tick position
+	 */
+	public static void setTempo(int bpm) {
+		// tempoMsg
+	}
+
+	/** 
+	 * Sets the current editing position of the sequencer.
+	 * @param ticks		the tick position
+	 */
+	public static void setTimeSig(int bpm) {
+		// timeSigMsg
+	}
+	
+	/** 
+	 * Sets the solo setting of the given track.
+	 * @param on	true for solo, false for not
+	 */
+	public static void setTrackSolo(Track track, boolean on){
+		trackSolo.put(track, new Boolean(on));	
+	}
+
+	/** 
+	 * Sets the mute setting of the given track.
+	 * @param on	true for mute, false for not
+	 */
+	public static void setTrackMute(Track track, boolean on){
+		trackMute.put(track, new Boolean(on));	
+	}
+
+	/** 
+	 * Sets the current playback volume.
+	 * @param volume	the volume, between 0 and 1
+	 */
+	public void setVolume(long volume) {
+		for (int i = 0; i < channels.length; i++) {
+			channels[i].controlChange(7, (int)(volume * 127.0));
+		}
+	}
+
+
+
+
+
+
+
+
+	/*				***
+	 **  ENCODING / DECODING METHODS **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Returns the byte array for the given tempo.
+	 * @param tempo	the tempo in beats per minute
+	 * @return an array of bytes representing the given tempo
+	 */
+	public static byte[] encodeTempo(int tempo) {
+		int microSecsPerQuarter = 60000000 / tempo;
+		byte[] b = new byte[3];
+		b[0] = (byte)(microSecsPerQuarter / 65536);
+		b[1] = (byte)((microSecsPerQuarter - (b[0] * 65536)) / 256);
+		b[2] = (byte)(microSecsPerQuarter - (b[0] * 65536) - (b[1] * 256));
+		return b;
+	}
+
+	/** 
+	 * Returns the tempo for the given byte array.
+	 * @param an array of three bytes representing the tempo
+	 * @return the tempo in beats per minute
+	 */
+	public static int decodeTempo(byte[] bytes) {
+		return 60000000 / (bytes[0] * 65536 + bytes[1] * 256 + bytes[2]); // bytes[0] & 0xFF ???
 	}
 
-	/* 
+	/** 
+	 * Returns the byte array for the given time signature.
+	 * @param numerator	the numerator of the time signature
+	 * @param denominator	the denominator of the time signature
+	 * @return an array of bytes representing the given time signature
+	 */
+	public static byte[] encodeTimeSig(int numerator, int denominator) {
+		byte[] b = {
+			(byte)numerator,
+			(byte)(Math.log(denominator) / Math.log(2)),
+			(byte)96,
+			(byte)8
+		};
+		return b;
+	}
+	/** 
+	 * Returns the time signature for the given byte array.
+	 * @param an array of four bytes representing the time signature
+	 * @return an array of two integers where [0] is the numerator and [1] the denominator
+	 */
+	public static int[] decodeTimeSig(byte[] bytes) {
+		int[] t = {
+			(int)bytes[0],
+			(int)(1 << bytes[1])
+		};
+		return t;
+	}
+
+
+
+
+
+
+
+
+	/*				***
+	 **	  PLAYBACK METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
 	 * Starts playback of the current sequence.
 	 */
 	public static void play() {
-		seq = mooSeq.getSequence();
-		sequencer.setSequence(seq);
+		sequencer.setTickPosition(editPosition);
+		resume();
+	}
+
+	/** 
+	 * Resumes playback of the current sequence.
+	 */
+	public static void resume() {
+		gui.update(0);
+		try {
+			sequencer.setSequence(seq);
+		} catch (InvalidMidiDataException e) {}
+		Track[] tracks = seq.getTracks();
+
 		sequencer.start();
+
+		for (int i = 0; i < tracks.length; i++) {
+
+			Object ob = trackSolo.get(tracks[i]);
+			if(ob instanceof Boolean){
+				sequencer.setTrackSolo(i,((Boolean)ob).booleanValue());
+			}
+
+			ob = trackMute.get(tracks[i]);
+			if(ob instanceof Boolean){
+				sequencer.setTrackMute(i,((Boolean)ob).booleanValue());
+			}
+		}
+
+		// Disables input to volatile components
+		// gui.disable();
+
+		// Creates the visualisation thread and starts it.
+		player = new PlayThread();
+		player.start();
 	}
 
-	/* 
+	/** 
 	 * Pauses playback of the current sequence.
 	 */
 	public static void pause() {
-	
+		if (sequencer.isRunning()) {
+			sequencer.stop();
+		}
+		if (player != null) player.interrupt();
 	}
 
-	/* 
+	/** 
 	 * Stops playback of the current sequence.
 	 */
 	public static void stop() {
-		sequencer.stop();
+		if (sequencer.isRunning()) {
+			sequencer.stop();
+		}
+		sequencer.setTickPosition(editPosition);
+		if (player != null) player.interrupt();
+		gui.update((long)0);
 	}
 
-	/* 
-	 * Rewinds the current sequence the given number of measures.
-	 * @param measures	the number of measures to rewind
+
+
+
+
+
+
+
+	/*				***
+	 **	  SYSTEM & IO METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Replaces the current sequence with a new one, holding three empty tracks.
 	 */
-	public static void rewind(int measures) {
-	
+	public static void clearSequence() {
+		try {
+			// Creates a new sequence.
+			seq = new Sequence(Sequence.PPQ, DEFAULT_RESOLUTION, DEFAULT_TRACKS);
+			Track[] tracks = seq.getTracks();
+
+			// Creates messages for default tempo (120) and time signature (4/4).
+			MetaMessage timeSigMsg = new MetaMessage();
+			MetaMessage tempoMsg = new MetaMessage();
+			try {
+				timeSigMsg.setMessage(88, encodeTimeSig(4, 4), 4);
+				tempoMsg.setMessage(81, encodeTempo(120), 3);
+			} catch (InvalidMidiDataException e) {}
+
+			// Adds them to track 0.
+			tracks[0].add(new MidiEvent(timeSigMsg, (long)0));
+			tracks[0].add(new MidiEvent(tempoMsg, (long)0));
+
+			// Sets program and title for the tracks.
+			initializeTrack(tracks[1], 0, 24, "Guitar");
+			initializeTrack(tracks[2], 1, 33, "Bass");
+			initializeTrack(tracks[3], 9, 0, "Drums");
+
+			file = null;
+			emptyTracks = new ArrayList();
+			timeSignatures = new ArrayList();
+			tempoChanges = new ArrayList();
+			trackSolo = new HashMap();
+			trackMute = new HashMap();
+			copyBuffer = new ArrayList();
+		} catch (InvalidMidiDataException e) {}
+		// Sends the sequence to the GUI.
+		if (gui != null) gui.setSequence(seq);
 	}
 
-	/* 
-	 * Fast forwards the current sequence the given number of measures.
-	 * @param measures	the number of measures to fast forward
+	/** 
+	 * Creates event in the given track for program change and title.
 	 */
-	public static void forward(int measures) {
+	private static void initializeTrack(Track track, int channel, int program, String title) {
+			// Creates program change and title message.
+			ShortMessage programMsg = new ShortMessage();
+			MetaMessage titleMsg = new MetaMessage();
+
+			// Sets the data of the messages.
+			try {
+				programMsg.setMessage(ShortMessage.PROGRAM_CHANGE, channel, program, 0);
+				titleMsg.setMessage(3, title.getBytes(), title.length());
+			} catch (InvalidMidiDataException e) {}
+
+			// Adds them to the track.
+			track.add(new MidiEvent(programMsg, (long)0));
+			track.add(new MidiEvent(titleMsg, (long)0));
+	}
 	
+	/** 
+	 * Wraps each NoteOn event in the track with its NoteOff event in a MooNote.
+	 * @param track		the track to convert
+	 * @param quantize	whether to round locations and durations in the track to nearest 16th
+	 * @return a list of the created MooNotes
+	 */
+	public static List convertTrack(Track track, boolean quantize) {
+		// Searches the track for NoteOn and NoteOff events
+		ArrayList noteOns = new ArrayList(track.size() / 2);
+		ArrayList noteOffs = new ArrayList(track.size() / 2);
+		ArrayList newMooNotes = new ArrayList();
+		MidiEvent event;
+		for (int j = 0; j < track.size(); j++) {
+			event = track.get(j);
+			if (event.getMessage().getStatus() >= 144 &&
+			    event.getMessage().getStatus() < 160) noteOns.add(event);
+			if (event.getMessage().getStatus() >= 128 &&
+			    event.getMessage().getStatus() < 144) noteOffs.add(event);
+		}
+		noteOns.trimToSize();
+		noteOffs.trimToSize();
+		if (noteOns.size() == 0) emptyTracks.add(track);
+		
+		// Sorts the note lists by tick position.
+		Comparator c = new MidiEventComparator();
+		Collections.sort(noteOns, c);
+		Collections.sort(noteOffs, c);
+
+		// Replaces each NoteOn event it with a MooNote containing a reference to the NoteOff event.
+		Iterator iOn = noteOns.iterator(), iOff;
+		MidiEvent on, off = null, nextOff;
+		ShortMessage onMsg, nextOffMsg;
+		while(iOn.hasNext()) {
+			on = (MidiEvent)iOn.next();
+		    	if (!(on instanceof MooNote)) {
+				onMsg = (ShortMessage)on.getMessage();
+				iOff = noteOffs.iterator();
+				while(iOff.hasNext()) {
+					nextOff = (MidiEvent)iOff.next();
+					nextOffMsg = (ShortMessage)nextOff.getMessage();
+					if(onMsg.getChannel() == nextOffMsg.getChannel() &&
+					   onMsg.getData1() == nextOffMsg.getData1() &&
+					   c.compare(nextOff, on) > 0) {
+						off = nextOff;
+						iOff.remove();
+						break;
+					}
+					   	
+				}
+				track.remove(on);
+				MooNote mn;
+				if (off != null) {
+					mn = new MooNote(on, off);
+				} else {
+					mn = new MooNote(on, new MidiEvent((ShortMessage)on.getMessage().clone(), on.getTick() + 48));
+				}
+				track.add(mn);
+				newMooNotes.add(mn);
+				iOn.remove();
+			}
+		}
+		if (quantize) quantize(newMooNotes, SIXTEENTH_NOTE, true, true);
+		return newMooNotes;
 	}
 
-	/* 
-	 * Loads the MooSequence in the given file.
+	/** 
+	 * Loads a MIDI sequence from the given file.
 	 * @param filename	the filename to use
 	 */
-	public static void load(String filename) throws IOException {
-	
+	public static boolean load(File loadFile) {
+		// Loads sequence from file
+		try {seq = MidiSystem.getSequence(loadFile);}
+		catch (Exception e) {return false;}
+		file = loadFile;
+		edited = false;
+
+		Track[] tracks = seq.getTracks();
+		emptyTracks = new ArrayList();
+		timeSignatures = new ArrayList();
+		tempoChanges = new ArrayList();
+		trackMute = new HashMap();
+		trackSolo = new HashMap();
+		copyBuffer = new ArrayList();
+
+		// Searches track 0 for changes in tempo and time signature.
+		MidiEvent event;
+		MetaMessage metaMsg;
+		ArrayList ts = new ArrayList(), tc = new ArrayList();
+		for (int i = 0; i < tracks[0].size(); i++) {
+			event = tracks[0].get(i);
+			if (event.getMessage().getStatus() == MetaMessage.META) {
+				metaMsg = (MetaMessage)event.getMessage();
+				switch(metaMsg.getType()) {
+					case 81: tempoChanges.add(event); break;
+					case 88: timeSignatures.add(event);
+				}
+			}
+		}
+
+		// Converts tracks.
+		for (int i = 0; i < tracks.length; i++) {
+			convertTrack(tracks[i], false);
+		}
+
+		// Sends sequence to GUI and sequencer, then returns
+		if (gui != null) gui.setSequence(seq);
+		try {
+			sequencer.setSequence(seq);
+		} catch (InvalidMidiDataException e) {}
+		return true;
 	}
 
-	/* 
-	 * Saves the current sequence to the given filename
-	 * @param filename	the filename to use
+	/** 
+	 * Quantizes the given list of MIDI events
+	 * @param notes		a list of the notes to quantize
+	 * @param resolution	the note size to round each note to
+	 * @param location	whether the quantize should affect the location of the note
+	 * @param duration	whether the quantize should affect the duration of the note
+	 */
+	public static void quantize(List notes, int resolution, boolean location, boolean duration) {
+		// Math.round(mn.getTick() / ticksPerSixteenth);
+	}
+
+	/** 
+	 * Loads the user preferences.
 	 */
-	public static void saveAs(String filename) throws IOException {
+	public static void loadPreferences() {
 		
 	}
 
-	/* 
+	/** 
+	 * Saves the user preferences.
+	 */
+	public static void savePreferences() {
+		
+	}
+
+	/** 
+	 * Prompts the user .
+	 */
+	public static boolean promptOnUnsavedChanges() {
+		if (!edited) return false;
+		int exitOption = JOptionPane.showConfirmDialog(gui,
+			"The current sequence has been edited, but not saved.\nDo you wish to continue anyway?",
+			"File not saved - continue?", 
+			JOptionPane.OK_CANCEL_OPTION, 
+			JOptionPane.WARNING_MESSAGE);
+		if (exitOption == JOptionPane.CANCEL_OPTION || exitOption == JOptionPane.CLOSED_OPTION) return true;
+		return false;
+	}
+
+	/** 
 	 * Saves the current sequence to the previously given filename.
 	 */
-	public static void save() throws IOException {
-	
+	public static boolean save() {
+		if (file == null) return false;
+		else {
+			saveAs(file);
+			return true;
+		}
 	}
 
-	/* 
-	 * Exports the current sequence to a standard MIDI file.
-	 * @param filename	the filename to use
+	/** 
+	 * Saves the current sequence to the given filename
+	 * @param file	the filename to use
+	 */
+	public static boolean saveAs(File saveFile) {
+		try {
+			MidiSystem.write(seq, 1, saveFile);
+			file = saveFile;
+			edited = false;
+			gui.setStatus("Saved " + file.getAbsolutePath());
+			return true;
+		} catch (IOException e) {
+			gui.setStatus("Failed in saving " + file.getAbsolutePath());
+			return false;
+		}
+	}
+
+	/** 
+	 * Prints the given string to the System output.
 	 */
-	public static void exportMIDI(String filename) throws IOException {
+	private static void out(String text) {
+		System.out.println(text);
+	}
+
+	/** 
+	 * Releases all reserved devices and exits the program.
+	 */
+	public static void quit() {
+		if (gui != null) {
+			if (promptOnUnsavedChanges()) return;
+		}
+		savePreferences();
+		if (sequencer.isOpen()) sequencer.close();
+		if (synthesizer.isOpen()) synthesizer.close();
+		System.exit(0);
+	}
 	
+	/** 
+	 * A Ccmparator for sorting lists of MidiEvents.
+	 */
+	public static class MidiEventComparator implements Comparator {
+		public int compare(Object o1, Object o2) {
+			int diff = (int)(((MidiEvent)o1).getTick() - ((MidiEvent)o2).getTick());
+			if (diff != 0 || !(((MidiEvent)o1).getMessage() instanceof ShortMessage) || !(((MidiEvent)o2).getMessage() instanceof ShortMessage)) return diff;
+			return (((ShortMessage)((MidiEvent)o1).getMessage()).getData1() - ((ShortMessage)((MidiEvent)o2).getMessage()).getData1());
+		}
+	}
+
+	/** 
+	 * The thread that updates the GUI during playback.
+	 */
+	public static class PlayThread extends Thread {
+		public void run() {
+			// Updates the GUI with the current tick position.
+			gui.update(sequencer.getTickPosition());
+
+			// Puts the thread to sleep for as long as it takes
+			// the sequencer to reach the next sixteenth.
+			try {
+				//sleep((long)((15000 / getTempo()) * (tickDiff / ticksPerSixteenth)));
+				sleep (10);
+			} catch (InterruptedException e) {
+				Moosique.stop();
+			}
+		}
+	}
+
+	/** 
+	 * A listener for detecting the end of the sequence.
+	 */
+	public static class SongEndListener implements MetaEventListener {
+		public void meta(MetaMessage event) {
+			if (event.getType() == 47)
+ 				// End of sequence
+				stop();
+		}
 	}
-}
\ No newline at end of file
+}