X-Git-Url: https://ruin.nu/git/?p=moosique.git;a=blobdiff_plain;f=Moosique.java;h=160380d5bb88be74d642efcc222d9d4cad88b411;hp=c7ea53fcc01703130d09cf33c4a722c57ab40ac6;hb=HEAD;hpb=c2644cb200b06d71a3e6c4548c37272228130c3d

diff --git a/Moosique.java b/Moosique.java
index c7ea53f..160380d 100644
--- a/Moosique.java
+++ b/Moosique.java
@@ -13,55 +13,93 @@ import java.util.*;
  
 public class Moosique {
 
+	// GUI and MIDI device variables
 	private static MooGUI gui;
 	private static Sequence seq;
 	private static Sequencer sequencer;
 	private static Synthesizer synthesizer;
+	private static Receiver receiver;
 	private static MidiChannel[] channels;
 	private static MidiChannel activeChannel;
 
-	private static String filename, fileArg;
-	private static long position;
-	private static boolean makeGUI = true;
+	// Recording variables
+	private static Track recordTrack = null;
+	private static MooTrackView recordTrackView = null;
+	private static boolean[] quantizers = {false, false, false};
+	private static int quantizeResolution;
+
+	// Collections
+	private static ArrayList copyBuffer, emptyTracks, timeSignatures, tempoChanges;
+	private static TreeSet selection;
+	private static Map trackMute = new HashMap();
+	private static Map trackSolo = new HashMap();
+
+	// Various...
+	private static File file = null;
+	private static long editPosition;
+	private static Thread player;
+
+	// Preferences
+	private static boolean makeGUI = true, initSound = true, edited = false, drawEmptyTracks = false;
+
+	// Constants
+	public static final int DEFAULT_RESOLUTION = 96, DEFAULT_TRACKS = 4;
+	public static final int WHOLE_NOTE = 16, HALF_NOTE = 8, QUARTER_NOTE = 4, EIGHTH_NOTE = 2, SIXTEENTH_NOTE = 1;
 
 	/** 
 	 * 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) {
-		System.out.println("\nMoosique version 1.0\n");
+		out("\nMoosique version 1.0\n", true);
 
 		// 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];}
+			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.");
+		out("Initializing MIDI devices.", false);
 		try {
+			// Configures sequencer.
 			sequencer = MidiSystem.getSequencer();
-			System.out.print(".");
+			advanceStatus();
 			sequencer.open();
+			sequencer.addMetaEventListener(new SongEndListener());
+
+			// Configures synthesizer.
 			synthesizer = MidiSystem.getSynthesizer();
-			System.out.print(".");
+			advanceStatus();
 			synthesizer.open();
-			sequencer.getTransmitter().setReceiver(synthesizer.getReceiver());
+
+			// Connects devices.
+			receiver = synthesizer.getReceiver();
+			sequencer.getTransmitter().setReceiver(receiver);
+
+			// Configures channels.
 			channels = synthesizer.getChannels();
 			setActiveChannel(0);
 		} catch (MidiUnavailableException e) {
-			System.out.println("Failed, quitting.");
+			out("Failed, quitting.", true);
 			System.exit(1);
 		}
-		System.out.println("Done");
+		out("Done", true);
+
+		// 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(fileArg)) {
-				System.out.println("Failed");
+			out("Loading MIDI sequence from " + fileArg + "...", false);
+			if (!load(new File(fileArg))) {
+				out("Failed, creating new sequence", true);
 				clearSequence();
 			} else {
-				System.out.println("Done");
+				out("Done", true);
 			}
 		} else {
 			// Otherwise creates a new empty one.
@@ -70,21 +108,71 @@ public class Moosique {
 
 		// Builds GUI, unless n-flag is set.
 		if (makeGUI) {
-			System.out.print("Building GUI...");
+			out("Building GUI.", false);
 			try {
 				UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
 			} catch (Exception e) {}
-			gui = new MooGUI(seq);
-			System.out.println("Done");
+			gui = new MooGUI(seq, file);
+			out("Done", true);
 		} else {
-			System.out.print("Playing...");
+			out("Playing...", false);
 			play();
 			while (sequencer.isRunning()) {}
-			System.out.println("Done");
+			out("Done", true);
 			quit();
 		}
 	}
 
+
+
+
+
+
+
+
+	/*				***
+	 **	  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
@@ -93,6 +181,14 @@ public class Moosique {
 		return gui;
 	}
 
+	/** 
+	 * Returns the receiver of the current sequencer.
+	 * @return the receiver
+	 */
+	public static Receiver getReceiver() {
+		return receiver;
+	}
+
 	/** 
 	 * Returns the current sequence.
 	 * @return the current sequence
@@ -110,19 +206,54 @@ public class Moosique {
 	}
 
 	/** 
-	 * Returns the MidiChannels of the selected synthesizer.
-	 * @return the available MidiChannels
+	 * Returns true if the current sequence has been edited.
+	 * @return the tick position
 	 */
-	public static MidiChannel[] getChannels() {
-		return channels;
+	public static boolean isEdited() {
+		return edited;
 	}
 
 	/** 
-	 * Returns the currently active MidiChannel.
-	 * @return the active MidiChannel
+	 * Returns whether the given track should be drawn
+	 * @return true if the given track should be drawn
 	 */
-	public static MidiChannel getActiveChannel() {
-		return activeChannel;
+	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;
 	}
 
 	/** 
@@ -134,168 +265,839 @@ public class Moosique {
 	}
 
 	/** 
-	 * Replaces the current sequence with a new one, holding three empty tracks.
+	 * Sets the current copy buffer.
+	 * @param the copy buffer
 	 */
-	public static void clearSequence() {
-		// Creates a new sequence and sends it to the sequencer.
-		try {
-			seq = new Sequence(Sequence.PPQ, 96, 3);
-			sequencer.setSequence(seq);
-		} catch (InvalidMidiDataException e) {}
-		// Sends sequence to GUI.
-		if (gui != null) gui.setSequence(seq);
+	public static void setCopyBuffer(ArrayList buffer) {
+		copyBuffer = buffer;
 	}
 
 	/** 
-	 * Starts playback of the current sequence.
+	 * Sets whether empty tracks should be drawn
+	 * @param state		true if empty tracks should be drawn
 	 */
-	public static void play() {
-		sequencer.setTickPosition(position);
-		sequencer.start();
+	public static void setDrawEmptyTracks(boolean state) {
+		drawEmptyTracks = state;
 	}
 
 	/** 
-	 * Pauses playback of the current sequence.
+	 * Sets the current sequence as edited, which implies prompts when loading a new sequence.
 	 */
-	public static void pause() {
-		sequencer.stop();
+	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 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));
+		}
+	}
+
+
+
+
+
+
+
+
+	/*				***
+	 **	  SELECTION METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Returns the current selection.
+	 * @return the current selection
+	 */
+	public static TreeSet getSelection() {
+		return selection;
+	}
+
+	/**
+	 * Selects the given note
+	 * @param the note to select
+	 */
+	public static void selectNote(MooNoteElement elem) {
+		selection.add(elem);
+	}
+
+	/**
+	 * Deselects the given note
+	 * @param the note to deselect
+	 */
+	public static void deselectNote(MooNoteElement elem) {
+		selection.remove(elem);
+	}
+
+	/**
+	 * Deselects all notes.
+	 */
+	public static void deselectAllNotes() {
+		Iterator it = selection.iterator();
+		while(it.hasNext()) {
+			((MooNoteElement)it.next()).deselect();
+		}
+		selection.clear();
+	}
+
+	/**
+	 * Determines if the given MooNoteElement is the only one in the track view that is selected.
+	 * @return if the given element is the only selected one
+	 */
+	public static boolean isTheOnlySelected(MooNoteElement elem) {
+		Iterator it = selection.iterator();
+		while(it.hasNext()) {
+			if (!it.next().equals(elem)) return false;
+		}
+		return true;
+	}
+
+
+
+
+
+
+
+
+	/*				***
+	 **	  PLAYBACK METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Starts playback of the current sequence.
+	 */
+	public static void play() {
+		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();
+		}
+		player = null;
 	}
 
 	/** 
 	 * Stops playback of the current sequence.
 	 */
 	public static void stop() {
-		sequencer.stop();
-		sequencer.setTickPosition(position);
+		if (sequencer.isRunning()) {
+			sequencer.stop();
+		}
+		sequencer.setTickPosition(editPosition);
+		player = null;
+		gui.update((long)0);
+
+		if (recordTrack != null && recordTrackView != null) {
+			recordTrackView.disableKeyboardRecording();
+			sequencer.stopRecording();
+			sequencer.recordDisable(recordTrack);
+			if (quantizers[0]) recordTrackView.placeNewNotes(quantize(
+				convertTrack(recordTrack), quantizeResolution, quantizers[1], quantizers[2]));
+			else recordTrackView.placeNewNotes(Moosique.convertTrack(recordTrack));
+		}
 	}
 
 	/** 
-	 * Rewinds the current sequence the given number of measures.
-	 * @param measures	the number of measures to rewind
+	 * Enables recording to the given track.
+	 * @param track		the track in which to store the recorded data
+	 * @param tempo		the channel from which to record data
+	 * @param quantizers	an array of booleans where 0 = quantize?, 1 = location, 2 = duration
+	 * @param resolution	the note size to round each note to
+	 * @return if the recording was initialised successfully
+	 */
+	public static boolean record(Track track, int channel, boolean[] quants, int resolution) {
+		try {
+			sequencer.recordEnable(track, channel);
+			sequencer.startRecording();
+		} catch(Exception e) {
+			e.printStackTrace();
+			return false;
+		}
+		quantizers = quants;
+		quantizeResolution = resolution;
+		recordTrack = track;
+		recordTrackView = gui.getView().getTrackView(track);
+		recordTrackView.enableKeyboardRecording();
+		Moosique.setEdited(); 
+		return true;
+	}
+
+
+
+
+
+
+
+
+	/*				    ***
+	 **  TEMPO & TIME SIGNATURE 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 long getPosition() {
-		return position;
+	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;
 	}
 
 	/** 
-	 * Rewinds the current sequence the given number of measures.
-	 * @param measures	the number of measures to rewind
+	 * 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 void setPosition(long ticks) {
-		position = ticks;
+	public static int decodeTempo(byte[] bytes) {
+		return 60000000 / (bytes[0] * 65536 + bytes[1] * 256 + bytes[2]);
 	}
 
 	/** 
-	 * Rewinds the current sequence the given number of measures.
-	 * @param measures	the number of measures to rewind
+	 * 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 void rewind(long ticks) {
-		setPosition(position - ticks);
+	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());
 	}
 
 	/** 
-	 * Fast forwards the current sequence the given number of measures.
-	 * @param measures	the number of measures to fast forward
+	 * Sets the tempo at the given tick position.
+	 * @param ticks		the tick position
 	 */
-	public static void forward(long ticks) {
-		setPosition(position + ticks);
+	public static void setTempo(long tick, int bpm) {
+		// Checks for a tempo event at the given tick position. 
+		MidiEvent tempoEvent = null;
+		Iterator it = tempoChanges.iterator();
+		while(it.hasNext()) {
+			MidiEvent nextTempoEvent = (MidiEvent)it.next();
+			if (nextTempoEvent.getTick() == tick) {
+				tempoEvent = nextTempoEvent;
+				break;
+			}
+		}
+
+		// If none was found, creates and adds a new one.
+		if (tempoEvent == null) {
+			tempoEvent = new MidiEvent(new MetaMessage(), tick);
+			(seq.getTracks())[0].add(tempoEvent);
+			tempoChanges.add(tempoEvent);
+			Collections.sort(tempoChanges, new MidiEventComparator());
+		}
+
+		// Sets the tempo of the event (found or created).
+		try {
+			((MetaMessage)tempoEvent.getMessage()).setMessage(81, encodeTempo(bpm), 3);
+		} catch (InvalidMidiDataException e) {}
+	}
+
+	/** 
+	 * 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)), // logarithm of denominator in base 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;
+	}
+
+	/** 
+	 * 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());
+	}
+
+	/** 
+	 * Sets the time signature at the given tick position.
+	 * @param ticks		the tick position
+	 */
+	public static void setTimeSig(long tick, int numerator, int denominator) {
+		// Checks for a time signature event at the given tick position. 
+		MidiEvent timeSigEvent = null;
+		Iterator it = timeSignatures.iterator();
+		while(it.hasNext()) {
+			MidiEvent nextTimeSigEvent = (MidiEvent)it.next();
+			if (nextTimeSigEvent.getTick() == tick) {
+				timeSigEvent = nextTimeSigEvent;
+				break;
+			}
+		}
+
+		// If none was found, creates and adds a new one.
+		if (timeSigEvent == null) {
+			timeSigEvent = new MidiEvent(new MetaMessage(), tick);
+			(seq.getTracks())[0].add(timeSigEvent);
+			timeSignatures.add(timeSigEvent);
+			Collections.sort(timeSignatures, new MidiEventComparator());
+		}
+
+		// Sets the time signature of the event (found or created).
+		try {
+			((MetaMessage)timeSigEvent.getMessage()).setMessage(88, encodeTimeSig(numerator, denominator), 4);
+		} catch (InvalidMidiDataException e) {}
+	}
+	
+	/**
+	 * Calculates the position (measures, beats, ticks) in the current sequence for the given tick position.
+	 * @param tickPosition the tick position for which to calculate the position
+	 * @return an array of integers where index 0 is measures, 1 is beats and 2 is ticks.
+	 */
+	public static int[] getPositionForTicks(long tickPosition) {
+		int ticksPerBeat = seq.getResolution();
+		long measures = 0, beats = 0, ticks = 0;
+
+		// Counts for each time signature change up to the last one before the given tick position.
+		Iterator it = timeSignatures.iterator();
+		MidiEvent lastTSEvent = (MidiEvent)it.next();
+		while(it.hasNext()) {
+			MidiEvent nextTSEvent = (MidiEvent)it.next();
+			if (nextTSEvent.getTick() > tickPosition) break;
+			long tickDiff = nextTSEvent.getTick() - lastTSEvent.getTick();
+			int[] ts = decodeTimeSig(((MetaMessage)lastTSEvent.getMessage()).getData());
+			int beatsPerMeasure = ts[0] * (4 / ts[1]);
+			long thisTSMeasures = tickDiff / (beatsPerMeasure * ticksPerBeat);
+			measures += thisTSMeasures;
+			long thisTSBeats = (tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat) / ticksPerBeat;
+			beats += thisTSBeats;
+			ticks += tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat - thisTSBeats * ticksPerBeat;
+			lastTSEvent = nextTSEvent;
+		}
+
+		// Counts from the given tick position to the last time signature change before it.
+		long tickDiff = tickPosition - lastTSEvent.getTick();
+		int[] ts = decodeTimeSig(((MetaMessage)lastTSEvent.getMessage()).getData());
+		int beatsPerMeasure = ts[0] * (4 / ts[1]);
+		long thisTSMeasures = tickDiff / (beatsPerMeasure * ticksPerBeat);
+		measures += thisTSMeasures;
+		long thisTSBeats = (tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat) / ticksPerBeat;
+		beats += thisTSBeats;
+		ticks += tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat - thisTSBeats * ticksPerBeat;
+
+		// Corrects any overflows.
+		if (ticks > ticksPerBeat) {
+			beats += Math.floor(ticks / ticksPerBeat);
+			ticks = ticks % ticksPerBeat;
+		}
+		if (beats > beatsPerMeasure) {
+			measures += Math.floor(beats / beatsPerMeasure);
+			beats = beats % beatsPerMeasure;
+		}
+
+		// Returns the calculated values.
+		int[] pos = {(int)measures, (int)beats, (int)ticks};
+		return pos;
+	}
+
+	/** 
+	 * Calculates the tick position in the current sequence for the given position (measures, beats, ticks).
+	 * @param measures	the measure of the current position
+	 * @param beats		the beat of the current position
+	 * @param tick		the tick of the current position
+	 * @return the tick position.
+	 */
+	public static long getTicksForPosition(int measures, int beats, int ticks) {
+		int res = seq.getResolution();
+		int[] lastTSPos = new int[3];
+		long tickPosition = 0;
+
+		// Counts for each time signature change up to the last one before the given tick position.
+		Iterator it = timeSignatures.iterator();
+		MidiEvent lastTSEvent = (MidiEvent)it.next();
+		while(it.hasNext()) {
+			MidiEvent nextTSEvent = (MidiEvent)it.next();
+			int[] nextTSPos = getPositionForTicks(nextTSEvent.getTick());
+			if (nextTSPos[0] >= measures) break;
+			lastTSPos = nextTSPos;
+			lastTSEvent = nextTSEvent;
+		}
+
+		// Counts from the given tick position to the last time signature change before it.
+		int measdiff = measures - lastTSPos[0];
+		int[] ts = decodeTimeSig(((MetaMessage)lastTSEvent.getMessage()).getData());
+		int beatsPerMeasure = ts[0] * (4 / ts[1]);
+		tickPosition = lastTSEvent.getTick() + (beatsPerMeasure * measures + beats) * res + ticks;
+
+		return tickPosition;
+	}
+
+
+
+
+
+
+
+
+	/*				***
+	 **	  SYSTEM & IO METHODS	 **
+	 ***				  */
+
+
+
+
+
+
+
+
+	/** 
+	 * Replaces the current sequence with a new one, holding three empty tracks.
+	 */
+	public static void clearSequence() {
+		// Reinitializes sequence variables
+		file = null;
+		reinitializeLists();
+
+		try {
+			// Creates a new sequence.
+			seq = new Sequence(Sequence.PPQ, DEFAULT_RESOLUTION, DEFAULT_TRACKS);
+			Track[] tracks = seq.getTracks();
+
+			// Sets default tempo (120) and time signature (4/4) at the beginning of the sequence.
+			setTempo(0, 120);
+			setTimeSig(0, 4, 4);
+
+			// 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");
+		} catch (InvalidMidiDataException e) {}
+
+		// Sends the sequence to the GUI.
+		if (gui != null) gui.setSequence(seq, null);
 	}
 
 	/** 
-	 * Loads the MooSequence in the given file.
+	 * Creates event in the given track for program change and title.
+	 */
+	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) {}
+
+			// Sends the program change to the channel
+			getChannel(channel).programChange(program);
+
+			// 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) {
+		// 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();
+			}
+		}
+		return newMooNotes;
+	}
+
+	/** 
+	 * Loads a MIDI sequence from the given file.
 	 * @param filename	the filename to use
 	 */
-	public static boolean load(String file) {
+	public static boolean load(File loadFile) {
 		// Loads sequence from file
-		filename = file;
+		try {seq = MidiSystem.getSequence(loadFile);}
+		catch (Exception e) {return false;}
+		file = loadFile;
+		edited = false;
+
+		Track[] tracks = seq.getTracks();
+		reinitializeLists();
+
+		// Searches track 0 for changes in tempo and time signature.
+		MidiEvent event;
+		MetaMessage metaMsg;
+		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);
+				}
+			}
+		}
+		Comparator c = new MidiEventComparator();
+		Collections.sort(tempoChanges, c);
+		Collections.sort(timeSignatures, c);
+
 		try {
-			seq = MidiSystem.getSequence(new File(filename));
-		} catch (InvalidMidiDataException e) {
-			return false;
-		} catch (IOException e) {
-			return false;
+			// If no time signature specified at tick 0, adds the standard one.
+			if (timeSignatures.size() == 0 || ((MidiEvent)timeSignatures.get(0)).getTick() != 0) {
+				MetaMessage timeSigMsg = new MetaMessage();
+				timeSigMsg.setMessage(88, encodeTimeSig(4, 4), 4);
+				timeSignatures.add(0, new MidiEvent(timeSigMsg, (long)0));
+			}
+
+			// If no tempo specified at tick 0, adds the standard one.
+			if (tempoChanges.size() == 0 || ((MidiEvent)tempoChanges.get(0)).getTick() != 0) {
+				MetaMessage tempoMsg = new MetaMessage();
+				tempoMsg.setMessage(81, encodeTempo(120), 3);
+				tempoChanges.add(0, new MidiEvent(tempoMsg, (long)0));
+			}
+		} catch (Exception e) {}
+
+		// Converts tracks.
+		for (int i = 0; i < tracks.length; i++) {
+			convertTrack(tracks[i]);
 		}
 
-		// Sends sequence to GUI and sequencer
-		if (gui != null) gui.setSequence(seq);
+		// Sends sequence to GUI and sequencer, then returns
+		if (gui != null) gui.setSequence(seq, file);
 		try {
 			sequencer.setSequence(seq);
 		} catch (InvalidMidiDataException e) {}
+		return true;
+	}
 
-		// Searches the sequence for NoteOn events
-		Track[] tracks = seq.getTracks();
-		MidiEvent noteOn, noteOff = null, nextEvent;
-		MidiMessage nextMsg;
-		ShortMessage shortMsg;
-		for (int i = 0; i < tracks.length; i++) {
-	/*
-			Collections.sort(track[i].events, new Comparator() {
-				public int compare(Object o1, Object o2) {
-					return ((MidiEvent)o2).getTick() - ((MidiEvent)o1).getTick();
-				}
-		        });
-	*/
-			for (int j = 0; j < tracks[i].size(); j++) {
-				noteOn = tracks[i].get(j);
-				if (noteOn.getMessage() instanceof ShortMessage) {
-					if (((ShortMessage)noteOn.getMessage()).getCommand() == ShortMessage.NOTE_ON) {
-						// Finds the corresponding NoteOff event
-						for (int k = j + 1; k < tracks[i].size(); k++) {
-							nextEvent = tracks[i].get(k);
-							nextMsg = nextEvent.getMessage();
-							if (nextMsg instanceof ShortMessage) {
-								shortMsg = (ShortMessage) nextMsg;
-								if (shortMsg.getCommand() == ShortMessage.NOTE_OFF && shortMsg.getChannel() == ((ShortMessage)noteOn.getMessage()).getChannel() && shortMsg.getData1() == ((ShortMessage)noteOn.getMessage()).getData1()) {
-									noteOff = nextEvent;
-									break;
-								}
-							}
- 						}
- 						// Replaces the NoteOn event with a MooNote, if possible with the corresponding NoteOff event
-						tracks[i].remove(noteOn);
- 						if (noteOff != null) {
-							tracks[i].add(new MooNote(noteOn, noteOff));
-						} else {
-							tracks[i].add(new MooNote(noteOn));
-						}
-					}
+	/** 
+	 * 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 List quantize(List notes, int resolution, boolean location, boolean duration) {
+		Iterator it = notes.iterator();
+		int noteSize = resolution * seq.getResolution() / 4;
+		while(it.hasNext()) {
+			MidiEvent note = (MidiEvent)it.next();
+			if (note instanceof MooNote) {
+				MooNote mn = (MooNote)note;
+				if (location) mn.setTick(Math.round(mn.getTick() / noteSize) * noteSize);
+				if (duration) {
+					int length = Math.round(mn.getDuration() / noteSize) * noteSize;
+					if (length < noteSize) length = noteSize;
+					mn.setDuration(length);
 				}
 			}
 		}
-		return true;
+		return notes;
+	}
+
+	/** 
+	 * Reinitializes sequence-specific collections.
+	 */
+	private static void reinitializeLists() {
+		emptyTracks	= new ArrayList();
+		timeSignatures 	= new ArrayList();
+		tempoChanges 	= new ArrayList();
+		copyBuffer 	= new ArrayList();
+		trackSolo 	= new HashMap();
+		trackMute 	= new HashMap();
+		selection 	= new TreeSet();
+	}
+
+	/** 
+	 * Loads the user preferences.
+	 */
+	public static void loadPreferences() {
+		
+	}
+
+	/** 
+	 * Saves the user preferences.
+	 */
+	public static void savePreferences() {
+		
+	}
+
+	/** 
+	 * Prompts the user to save any unsaved changes.
+	 */
+	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 boolean save() {
+		if (file == null) return false;
+		else {
+			saveAs(file);
+			return true;
+		}
 	}
 
 	/** 
 	 * Saves the current sequence to the given filename
 	 * @param file	the filename to use
 	 */
-	public static void saveAs(String file) {
+	public static boolean saveAs(File saveFile) {
 		try {
-			MidiSystem.write(seq, 1, new File(filename));
-		} catch (IOException e) {}
-		filename = file;
+			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;
+		}
 	}
 
 	/** 
-	 * Saves the current sequence to the previously given filename.
+	 * Prints the given string to the System output.
+	 */
+	private static void out(String text, boolean newLine) {
+		if (newLine) System.out.println(text);
+		else System.out.print(text);
+	}
+
+	/** 
+	 * Advances the current progress counter by printing a "." to the System output.
 	 */
-	public static void save() {
-		saveAs(filename);
+	private static void advanceStatus() {
+		out(".", false);
 	}
 
 	/** 
 	 * 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() {
+			Thread currentThread = Thread.currentThread();
+			while(currentThread == player) {
+				gui.update(sequencer.getTickPosition());
+				try {
+					sleep(10);
+				} catch (InterruptedException e) {
+					Moosique.stop();
+				}
+			}
+		}
+	}
+
+	/** 
+	 * A listener for detecting the Meta event signifying the end of the sequence.
+	 */
+	public static class SongEndListener implements MetaEventListener {
+		public void meta(MetaMessage event) {
+			if (event.getType() == 47)
+				stop();
+ 		}
+	}
 }