Moosique.java

   1 import javax.sound.midi.*;
   2 import java.io.*;
   3 import javax.swing.*;
   4 import java.util.*;
   5
   6 /**
   7  * Moosique - The MIDI Tracker
   8  *
   9  * Main class that handles initiation, IO and sound.
  10  *
  11  * @author  Einar Pehrson
  12  */
  13
  14 public class Moosique {
  15
  16         // GUI and MIDI device variables
  17         private static MooGUI gui;
  18         private static Sequence seq;
  19         private static Sequencer sequencer;
  20         private static Synthesizer synthesizer;
  21         private static Receiver receiver;
  22         private static MidiChannel[] channels;
  23         private static MidiChannel activeChannel;
  24
  25         // Recording variables
  26         private static Track recordTrack = null;
  27         private static MooTrackView recordTrackView = null;
  28         private static boolean[] quantizers = {false, false, false};
  29         private static int quantizeResolution;
  30
  31         // Collections
  32         private static ArrayList copyBuffer, emptyTracks, timeSignatures, tempoChanges;
  33         private static TreeSet selection;
  34         private static Map trackMute = new HashMap();
  35         private static Map trackSolo = new HashMap();
  36
  37         // Various...
  38         private static File file = null;
  39         private static long editPosition;
  40         private static Thread player;
  41
  42         // Preferences
  43         private static boolean makeGUI = true, initSound = true, edited = false, drawEmptyTracks = false;
  44
  45         // Constants
  46         public static final int DEFAULT_RESOLUTION = 96, DEFAULT_TRACKS = 4;
  47         public static final int WHOLE_NOTE = 16, HALF_NOTE = 8, QUARTER_NOTE = 4, EIGHTH_NOTE = 2, SIXTEENTH_NOTE = 1;
  48
  49         /**
  50          * Starts the application.
  51          *
  52          * Parses command-line arguments, acquires MIDI devices and connects them,
  53          * loads a sequence and creates the GUI.
  54          */
  55         public static void main (String[] args) {
  56                 out("\nMoosique version 1.0\n", true);
  57
  58                 // Parses command-line arguments.
  59                 String fileArg = null;
  60                 for (int i = 0; i < args.length; i++) {
  61                         if (args[i].equals("-n")) makeGUI = false;
  62                         else if (fileArg == null) fileArg = args[i];
  63                 }
  64
  65                 // Acquires MIDI devices and connects them.
  66                 out("Initializing MIDI devices.", false);
  67                 try {
  68                         // Configures sequencer.
  69                         sequencer = MidiSystem.getSequencer();
  70                         advanceStatus();
  71                         sequencer.open();
  72                         sequencer.addMetaEventListener(new SongEndListener());
  73
  74                         // Configures synthesizer.
  75                         synthesizer = MidiSystem.getSynthesizer();
  76                         advanceStatus();
  77                         synthesizer.open();
  78
  79                         // Connects devices.
  80                         receiver = synthesizer.getReceiver();
  81                         sequencer.getTransmitter().setReceiver(receiver);
  82
  83                         // Configures channels.
  84                         channels = synthesizer.getChannels();
  85                         setActiveChannel(0);
  86                 } catch (MidiUnavailableException e) {
  87                         out("Failed, quitting.", true);
  88                         System.exit(1);
  89                 }
  90                 out("Done", true);
  91
  92                 // Loads user preferences (work directory, last opened files etc).
  93                 loadPreferences();
  94
  95                 //If a filename is given as the command-line argument, attempts to load a sequence from the file.
  96                 if (fileArg != null) {
  97                         out("Loading MIDI sequence from " + fileArg + "...", false);
  98                         if (!load(new File(fileArg))) {
  99                                 out("Failed, creating new sequence", true);
 100                                 clearSequence();
 101                         } else {
 102                                 out("Done", true);
 103                         }
 104                 } else {
 105                         // Otherwise creates a new empty one.
 106                         clearSequence();
 107                 }
 108
 109                 // Builds GUI, unless n-flag is set.
 110                 if (makeGUI) {
 111                         out("Building GUI.", false);
 112                         try {
 113                                 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
 114                         } catch (Exception e) {}
 115                         gui = new MooGUI(seq, file);
 116                         out("Done", true);
 117                 } else {
 118                         out("Playing...", false);
 119                         play();
 120                         while (sequencer.isRunning()) {}
 121                         out("Done", true);
 122                         quit();
 123                 }
 124         }
 125
 126
 127
 128
 129
 130
 131
 132
 133         /*                              ***
 134          **       ACCESSOR METHODS       **
 135          ***                              */
 136
 137
 138
 139
 140
 141
 142
 143
 144         /**
 145          * Returns the currently active MidiChannel.
 146          * @return the active MidiChannel
 147          */
 148         public static MidiChannel getActiveChannel() {
 149                 return activeChannel;
 150         }
 151
 152         /**
 153          * Returns the MidiChannels of the selected synthesizer.
 154          * @return the available MidiChannels
 155          */
 156         public static MidiChannel getChannel(int i) {
 157                 return channels[i];
 158         }
 159
 160         /**
 161          * Returns the current copy buffer.
 162          * @return the current copy buffer
 163          */
 164         public static ArrayList getCopyBuffer() {
 165                 return copyBuffer;
 166         }
 167
 168         /**
 169          * Returns the current editing position of the sequencer.
 170          * @return the tick position
 171          */
 172         public static long getEditPosition() {
 173                 return editPosition;
 174         }
 175
 176         /**
 177          * Returns the GUI.
 178          * @return the GUI
 179          */
 180         public static MooGUI getGUI() {
 181                 return gui;
 182         }
 183
 184         /**
 185          * Returns the receiver of the current sequencer.
 186          * @return the receiver
 187          */
 188         public static Receiver getReceiver() {
 189                 return receiver;
 190         }
 191
 192         /**
 193          * Returns the current sequence.
 194          * @return the current sequence
 195          */
 196         public static Sequence getSequence() {
 197                 return seq;
 198         }
 199
 200         /**
 201          * Returns the current sequencer.
 202          * @return the current sequencer
 203          */
 204         public static Sequencer getSequencer() {
 205                 return sequencer;
 206         }
 207
 208         /**
 209          * Returns true if the current sequence has been edited.
 210          * @return the tick position
 211          */
 212         public static boolean isEdited() {
 213                 return edited;
 214         }
 215
 216         /**
 217          * Returns whether the given track should be drawn
 218          * @return true if the given track should be drawn
 219          */
 220         public static boolean shouldBeDrawn(Track track) {
 221                 if (drawEmptyTracks) return true;
 222                 else return (!emptyTracks.contains(track));
 223         }
 224
 225
 226
 227
 228
 229
 230
 231
 232         /*                              ***
 233          **       MUTATOR METHODS        **
 234          ***                              */
 235
 236
 237
 238
 239
 240
 241
 242
 243         /**
 244          * Fast forwards the current sequence the given number of measures.
 245          * @param measures      the number of measures to fast forward
 246          */
 247         public static void forward(long ticks) {
 248                 editPosition += ticks;
 249         }
 250
 251         /**
 252          * Rewinds the current sequence the given number of measures.
 253          * @param measures      the number of measures to rewind
 254          */
 255         public static void rewind(long ticks) {
 256                 editPosition -= ticks;
 257         }
 258
 259         /**
 260          * Sets the currently active MidiChannel.
 261          * @param channel       the number of the MidiChannel to activate
 262          */
 263         public static void setActiveChannel(int channel) {
 264                 activeChannel = channels[channel];
 265         }
 266
 267         /**
 268          * Sets the current copy buffer.
 269          * @param the copy buffer
 270          */
 271         public static void setCopyBuffer(ArrayList buffer) {
 272                 copyBuffer = buffer;
 273         }
 274
 275         /**
 276          * Sets whether empty tracks should be drawn
 277          * @param state         true if empty tracks should be drawn
 278          */
 279         public static void setDrawEmptyTracks(boolean state) {
 280                 drawEmptyTracks = state;
 281         }
 282
 283         /**
 284          * Sets the current sequence as edited, which implies prompts when loading a new sequence.
 285          */
 286         public static void setEdited() {
 287                 edited = true;
 288         }
 289
 290         /**
 291          * Sets the current editing position of the sequencer.
 292          * @param ticks         the tick position
 293          */
 294         public static void setEditPosition(long ticks) {
 295                 editPosition = ticks;
 296         }
 297
 298         /**
 299          * Sets the solo setting of the given track.
 300          * @param on    true for solo, false for not
 301          */
 302         public static void setTrackSolo(Track track, boolean on){
 303                 trackSolo.put(track, new Boolean(on));
 304         }
 305
 306         /**
 307          * Sets the mute setting of the given track.
 308          * @param on    true for mute, false for not
 309          */
 310         public static void setTrackMute(Track track, boolean on){
 311                 trackMute.put(track, new Boolean(on));
 312         }
 313
 314         /**
 315          * Sets the current playback volume.
 316          * @param volume        the volume, between 0 and 1
 317          */
 318         public void setVolume(long volume) {
 319                 for (int i = 0; i < channels.length; i++) {
 320                         channels[i].controlChange(7, (int)(volume * 127.0));
 321                 }
 322         }
 323
 324
 325
 326
 327
 328
 329
 330
 331         /*                              ***
 332          **       SELECTION METHODS      **
 333          ***                              */
 334
 335
 336
 337
 338
 339
 340
 341
 342         /**
 343          * Returns the current selection.
 344          * @return the current selection
 345          */
 346         public static TreeSet getSelection() {
 347                 return selection;
 348         }
 349
 350         /**
 351          * Selects the given note
 352          * @param the note to select
 353          */
 354         public static void selectNote(MooNoteElement elem) {
 355                 selection.add(elem);
 356         }
 357
 358         /**
 359          * Deselects the given note
 360          * @param the note to deselect
 361          */
 362         public static void deselectNote(MooNoteElement elem) {
 363                 selection.remove(elem);
 364         }
 365
 366         /**
 367          * Deselects all notes.
 368          */
 369         public static void deselectAllNotes() {
 370                 Iterator it = selection.iterator();
 371                 while(it.hasNext()) {
 372                         ((MooNoteElement)it.next()).deselect();
 373                 }
 374                 selection.clear();
 375         }
 376
 377         /**
 378          * Determines if the given MooNoteElement is the only one in the track view that is selected.
 379          * @return if the given element is the only selected one
 380          */
 381         public static boolean isTheOnlySelected(MooNoteElement elem) {
 382                 Iterator it = selection.iterator();
 383                 while(it.hasNext()) {
 384                         if (!it.next().equals(elem)) return false;
 385                 }
 386                 return true;
 387         }
 388
 389
 390
 391
 392
 393
 394
 395
 396         /*                              ***
 397          **       PLAYBACK METHODS       **
 398          ***                              */
 399
 400
 401
 402
 403
 404
 405
 406
 407         /**
 408          * Starts playback of the current sequence.
 409          */
 410         public static void play() {
 411                 sequencer.setTickPosition(editPosition);
 412                 resume();
 413         }
 414
 415         /**
 416          * Resumes playback of the current sequence.
 417          */
 418         public static void resume() {
 419                 gui.update(0);
 420                 try {
 421                         sequencer.setSequence(seq);
 422                 } catch (InvalidMidiDataException e) {}
 423                 Track[] tracks = seq.getTracks();
 424
 425                 sequencer.start();
 426
 427                 for (int i = 0; i < tracks.length; i++) {
 428
 429                         Object ob = trackSolo.get(tracks[i]);
 430                         if(ob instanceof Boolean){
 431                                 sequencer.setTrackSolo(i,((Boolean)ob).booleanValue());
 432                         }
 433
 434                         ob = trackMute.get(tracks[i]);
 435                         if(ob instanceof Boolean){
 436                                 sequencer.setTrackMute(i,((Boolean)ob).booleanValue());
 437                         }
 438                 }
 439
 440                 // Disables input to volatile components
 441                 // gui.disable();
 442
 443                 // Creates the visualisation thread and starts it.
 444                 player = new PlayThread();
 445                 player.start();
 446         }
 447
 448         /**
 449          * Pauses playback of the current sequence.
 450          */
 451         public static void pause() {
 452                 if (sequencer.isRunning()) {
 453                         sequencer.stop();
 454                 }
 455                 player = null;
 456         }
 457
 458         /**
 459          * Stops playback of the current sequence.
 460          */
 461         public static void stop() {
 462                 if (sequencer.isRunning()) {
 463                         sequencer.stop();
 464                 }
 465                 sequencer.setTickPosition(editPosition);
 466                 player = null;
 467                 gui.update((long)0);
 468
 469                 if (recordTrack != null && recordTrackView != null) {
 470                         recordTrackView.disableKeyboardRecording();
 471                         sequencer.stopRecording();
 472                         sequencer.recordDisable(recordTrack);
 473                         if (quantizers[0]) recordTrackView.placeNewNotes(quantize(
 474                                 convertTrack(recordTrack), quantizeResolution, quantizers[1], quantizers[2]));
 475                         else recordTrackView.placeNewNotes(Moosique.convertTrack(recordTrack));
 476                 }
 477         }
 478
 479         /**
 480          * Enables recording to the given track.
 481          * @param track         the track in which to store the recorded data
 482          * @param tempo         the channel from which to record data
 483          * @param quantizers    an array of booleans where 0 = quantize?, 1 = location, 2 = duration
 484          * @param resolution    the note size to round each note to
 485          * @return if the recording was initialised successfully
 486          */
 487         public static boolean record(Track track, int channel, boolean[] quants, int resolution) {
 488                 try {
 489                         sequencer.recordEnable(track, channel);
 490                         sequencer.startRecording();
 491                 } catch(Exception e) {
 492                         e.printStackTrace();
 493                         return false;
 494                 }
 495                 quantizers = quants;
 496                 quantizeResolution = resolution;
 497                 recordTrack = track;
 498                 recordTrackView = gui.getView().getTrackView(track);
 499                 recordTrackView.enableKeyboardRecording();
 500                 Moosique.setEdited();
 501                 return true;
 502         }
 503
 504
 505
 506
 507
 508
 509
 510
 511         /*                                  ***
 512          **  TEMPO & TIME SIGNATURE METHODS  **
 513          ***                                  */
 514
 515
 516
 517
 518
 519
 520
 521
 522         /**
 523          * Returns the byte array for the given tempo.
 524          * @param tempo the tempo in beats per minute
 525          * @return an array of bytes representing the given tempo
 526          */
 527         public static byte[] encodeTempo(int tempo) {
 528                 int microSecsPerQuarter = 60000000 / tempo;
 529                 byte[] b = new byte[3];
 530                 b[0] = (byte)(microSecsPerQuarter / 65536);
 531                 b[1] = (byte)((microSecsPerQuarter - (b[0] * 65536)) / 256);
 532                 b[2] = (byte)(microSecsPerQuarter - (b[0] * 65536) - (b[1] * 256));
 533                 return b;
 534         }
 535
 536         /**
 537          * Returns the tempo for the given byte array.
 538          * @param an array of three bytes representing the tempo
 539          * @return the tempo in beats per minute
 540          */
 541         public static int decodeTempo(byte[] bytes) {
 542                 return 60000000 / (bytes[0] * 65536 + bytes[1] * 256 + bytes[2]);
 543         }
 544
 545         /**
 546          * Returns the tempo in the given tick position.
 547          * @param tick the tick position for which to return the tempo
 548          * @return the tempo at the specified tick position
 549          */
 550         public static int getTempo(long tick) {
 551                 if (tempoChanges.size() == 0) return 120;
 552                 MidiEvent tempoEvent = (MidiEvent)tempoChanges.get(0);
 553                 if (tempoChanges.size() > 1) {
 554                         for (int i = 1; i < tempoChanges.size(); i++) {
 555                                 MidiEvent nextTempoEvent = (MidiEvent)tempoChanges.get(i);
 556                                 if (nextTempoEvent.getTick() < tick && nextTempoEvent.getTick() > tempoEvent.getTick())
 557                                         tempoEvent = nextTempoEvent;
 558                         }
 559                 }
 560                 return decodeTempo(((MetaMessage)tempoEvent.getMessage()).getData());
 561         }
 562
 563         /**
 564          * Sets the tempo at the given tick position.
 565          * @param ticks         the tick position
 566          */
 567         public static void setTempo(long tick, int bpm) {
 568                 // Checks for a tempo event at the given tick position.
 569                 MidiEvent tempoEvent = null;
 570                 Iterator it = tempoChanges.iterator();
 571                 while(it.hasNext()) {
 572                         MidiEvent nextTempoEvent = (MidiEvent)it.next();
 573                         if (nextTempoEvent.getTick() == tick) {
 574                                 tempoEvent = nextTempoEvent;
 575                                 break;
 576                         }
 577                 }
 578
 579                 // If none was found, creates and adds a new one.
 580                 if (tempoEvent == null) {
 581                         tempoEvent = new MidiEvent(new MetaMessage(), tick);
 582                         (seq.getTracks())[0].add(tempoEvent);
 583                         tempoChanges.add(tempoEvent);
 584                         Collections.sort(tempoChanges, new MidiEventComparator());
 585                 }
 586
 587                 // Sets the tempo of the event (found or created).
 588                 try {
 589                         ((MetaMessage)tempoEvent.getMessage()).setMessage(81, encodeTempo(bpm), 3);
 590                 } catch (InvalidMidiDataException e) {}
 591         }
 592
 593         /**
 594          * Returns the byte array for the given time signature.
 595          * @param numerator     the numerator of the time signature
 596          * @param denominator   the denominator of the time signature
 597          * @return an array of bytes representing the given time signature
 598          */
 599         public static byte[] encodeTimeSig(int numerator, int denominator) {
 600                 byte[] b = {
 601                         (byte)numerator,
 602                         (byte)(Math.log(denominator) / Math.log(2)), // logarithm of denominator in base 2
 603                         (byte)96,
 604                         (byte)8
 605                 };
 606                 return b;
 607         }
 608         /**
 609          * Returns the time signature for the given byte array.
 610          * @param an array of four bytes representing the time signature
 611          * @return an array of two integers where [0] is the numerator and [1] the denominator
 612          */
 613         public static int[] decodeTimeSig(byte[] bytes) {
 614                 int[] t = {
 615                         (int)bytes[0],
 616                         (int)(1 << bytes[1])
 617                 };
 618                 return t;
 619         }
 620
 621         /**
 622          * Returns the time signature in the given tick position.
 623          * @param tick the tick position for which to return the time signature
 624          * @return an array of two integers where [0] is the numerator and [1] the denominator
 625          */
 626         public static int[] getTimeSig(long tick) {
 627                 int[] ts = {4, 4};
 628                 if (timeSignatures.size() == 0) return ts;
 629                 MidiEvent timeSigEvent = (MidiEvent)timeSignatures.get(0);
 630                 if (timeSignatures.size() > 1) {
 631                         for (int i = 1; i < timeSignatures.size(); i++) {
 632                                 MidiEvent nextTimeSigEvent = (MidiEvent)timeSignatures.get(i);
 633                                 if (nextTimeSigEvent.getTick() <= tick && nextTimeSigEvent.getTick() > timeSigEvent.getTick())
 634                                         timeSigEvent = nextTimeSigEvent;
 635                         }
 636                 }
 637                 return decodeTimeSig(((MetaMessage)timeSigEvent.getMessage()).getData());
 638         }
 639
 640         /**
 641          * Sets the time signature at the given tick position.
 642          * @param ticks         the tick position
 643          */
 644         public static void setTimeSig(long tick, int numerator, int denominator) {
 645                 // Checks for a time signature event at the given tick position.
 646                 MidiEvent timeSigEvent = null;
 647                 Iterator it = timeSignatures.iterator();
 648                 while(it.hasNext()) {
 649                         MidiEvent nextTimeSigEvent = (MidiEvent)it.next();
 650                         if (nextTimeSigEvent.getTick() == tick) {
 651                                 timeSigEvent = nextTimeSigEvent;
 652                                 break;
 653                         }
 654                 }
 655
 656                 // If none was found, creates and adds a new one.
 657                 if (timeSigEvent == null) {
 658                         timeSigEvent = new MidiEvent(new MetaMessage(), tick);
 659                         (seq.getTracks())[0].add(timeSigEvent);
 660                         timeSignatures.add(timeSigEvent);
 661                         Collections.sort(timeSignatures, new MidiEventComparator());
 662                 }
 663
 664                 // Sets the time signature of the event (found or created).
 665                 try {
 666                         ((MetaMessage)timeSigEvent.getMessage()).setMessage(88, encodeTimeSig(numerator, denominator), 4);
 667                 } catch (InvalidMidiDataException e) {}
 668         }
 669
 670         /**
 671          * Calculates the position (measures, beats, ticks) in the current sequence for the given tick position.
 672          * @param tickPosition the tick position for which to calculate the position
 673          * @return an array of integers where index 0 is measures, 1 is beats and 2 is ticks.
 674          */
 675         public static int[] getPositionForTicks(long tickPosition) {
 676                 int ticksPerBeat = seq.getResolution();
 677                 long measures = 0, beats = 0, ticks = 0;
 678
 679                 // Counts for each time signature change up to the last one before the given tick position.
 680                 Iterator it = timeSignatures.iterator();
 681                 MidiEvent lastTSEvent = (MidiEvent)it.next();
 682                 while(it.hasNext()) {
 683                         MidiEvent nextTSEvent = (MidiEvent)it.next();
 684                         if (nextTSEvent.getTick() > tickPosition) break;
 685                         long tickDiff = nextTSEvent.getTick() - lastTSEvent.getTick();
 686                         int[] ts = decodeTimeSig(((MetaMessage)lastTSEvent.getMessage()).getData());
 687                         int beatsPerMeasure = ts[0] * (4 / ts[1]);
 688                         long thisTSMeasures = tickDiff / (beatsPerMeasure * ticksPerBeat);
 689                         measures += thisTSMeasures;
 690                         long thisTSBeats = (tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat) / ticksPerBeat;
 691                         beats += thisTSBeats;
 692                         ticks += tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat - thisTSBeats * ticksPerBeat;
 693                         lastTSEvent = nextTSEvent;
 694                 }
 695
 696                 // Counts from the given tick position to the last time signature change before it.
 697                 long tickDiff = tickPosition - lastTSEvent.getTick();
 698                 int[] ts = decodeTimeSig(((MetaMessage)lastTSEvent.getMessage()).getData());
 699                 int beatsPerMeasure = ts[0] * (4 / ts[1]);
 700                 long thisTSMeasures = tickDiff / (beatsPerMeasure * ticksPerBeat);
 701                 measures += thisTSMeasures;
 702                 long thisTSBeats = (tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat) / ticksPerBeat;
 703                 beats += thisTSBeats;
 704                 ticks += tickDiff - thisTSMeasures * beatsPerMeasure * ticksPerBeat - thisTSBeats * ticksPerBeat;
 705
 706                 // Corrects any overflows.
 707                 if (ticks > ticksPerBeat) {
 708                         beats += Math.floor(ticks / ticksPerBeat);
 709                         ticks = ticks % ticksPerBeat;
 710                 }
 711                 if (beats > beatsPerMeasure) {
 712                         measures += Math.floor(beats / beatsPerMeasure);
 713                         beats = beats % beatsPerMeasure;
 714                 }
 715
 716                 // Returns the calculated values.
 717                 int[] pos = {(int)measures, (int)beats, (int)ticks};
 718                 return pos;
 719         }
 720
 721         /**
 722          * Calculates the tick position in the current sequence for the given position (measures, beats, ticks).
 723          * @param measures      the measure of the current position
 724          * @param beats         the beat of the current position
 725          * @param tick          the tick of the current position
 726          * @return the tick position.
 727          */
 728         public static long getTicksForPosition(int measures, int beats, int ticks) {
 729                 int res = seq.getResolution();
 730                 int[] lastTSPos = new int[3];
 731                 long tickPosition = 0;
 732
 733                 // Counts for each time signature change up to the last one before the given tick position.
 734                 Iterator it = timeSignatures.iterator();
 735                 MidiEvent lastTSEvent = (MidiEvent)it.next();
 736                 while(it.hasNext()) {
 737                         MidiEvent nextTSEvent = (MidiEvent)it.next();
 738                         int[] nextTSPos = getPositionForTicks(nextTSEvent.getTick());
 739                         if (nextTSPos[0] >= measures) break;
 740                         lastTSPos = nextTSPos;
 741                         lastTSEvent = nextTSEvent;
 742                 }
 743
 744                 // Counts from the given tick position to the last time signature change before it.
 745                 int measdiff = measures - lastTSPos[0];
 746                 int[] ts = decodeTimeSig(((MetaMessage)lastTSEvent.getMessage()).getData());
 747                 int beatsPerMeasure = ts[0] * (4 / ts[1]);
 748                 tickPosition = lastTSEvent.getTick() + (beatsPerMeasure * measures + beats) * res + ticks;
 749
 750                 return tickPosition;
 751         }
 752
 753
 754
 755
 756
 757
 758
 759
 760         /*                              ***
 761          **       SYSTEM & IO METHODS    **
 762          ***                              */
 763
 764
 765
 766
 767
 768
 769
 770
 771         /**
 772          * Replaces the current sequence with a new one, holding three empty tracks.
 773          */
 774         public static void clearSequence() {
 775                 // Reinitializes sequence variables
 776                 file = null;
 777                 reinitializeLists();
 778
 779                 try {
 780                         // Creates a new sequence.
 781                         seq = new Sequence(Sequence.PPQ, DEFAULT_RESOLUTION, DEFAULT_TRACKS);
 782                         Track[] tracks = seq.getTracks();
 783
 784                         // Sets default tempo (120) and time signature (4/4) at the beginning of the sequence.
 785                         setTempo(0, 120);
 786                         setTimeSig(0, 4, 4);
 787
 788                         // Sets program and title for the tracks.
 789                         initializeTrack(tracks[1], 0, 24, "Guitar");
 790                         initializeTrack(tracks[2], 1, 33, "Bass");
 791                         initializeTrack(tracks[3], 9, 0, "Drums");
 792                 } catch (InvalidMidiDataException e) {}
 793
 794                 // Sends the sequence to the GUI.
 795                 if (gui != null) gui.setSequence(seq, null);
 796         }
 797
 798         /**
 799          * Creates event in the given track for program change and title.
 800          */
 801         private static void initializeTrack(Track track, int channel, int program, String title) {
 802                         // Creates program change and title message.
 803                         ShortMessage programMsg = new ShortMessage();
 804                         MetaMessage titleMsg = new MetaMessage();
 805
 806                         // Sets the data of the messages.
 807                         try {
 808                                 programMsg.setMessage(ShortMessage.PROGRAM_CHANGE, channel, program, 0);
 809                                 titleMsg.setMessage(3, title.getBytes(), title.length());
 810                         } catch (InvalidMidiDataException e) {}
 811
 812                         // Sends the program change to the channel
 813                         getChannel(channel).programChange(program);
 814
 815                         // Adds them to the track.
 816                         track.add(new MidiEvent(programMsg, (long)0));
 817                         track.add(new MidiEvent(titleMsg, (long)0));
 818         }
 819
 820         /**
 821          * Wraps each NoteOn event in the track with its NoteOff event in a MooNote.
 822          * @param track         the track to convert
 823          * @param quantize      whether to round locations and durations in the track to nearest 16th
 824          * @return a list of the created MooNotes
 825          */
 826         public static List convertTrack(Track track) {
 827                 // Searches the track for NoteOn and NoteOff events
 828                 ArrayList noteOns = new ArrayList(track.size() / 2);
 829                 ArrayList noteOffs = new ArrayList(track.size() / 2);
 830                 ArrayList newMooNotes = new ArrayList();
 831                 MidiEvent event;
 832                 for (int j = 0; j < track.size(); j++) {
 833                         event = track.get(j);
 834                         if (event.getMessage().getStatus() >= 144 &&
 835                             event.getMessage().getStatus() < 160) noteOns.add(event);
 836                         if (event.getMessage().getStatus() >= 128 &&
 837                             event.getMessage().getStatus() < 144) noteOffs.add(event);
 838                 }
 839                 noteOns.trimToSize();
 840                 noteOffs.trimToSize();
 841                 if (noteOns.size() == 0) emptyTracks.add(track);
 842
 843                 // Sorts the note lists by tick position.
 844                 Comparator c = new MidiEventComparator();
 845                 Collections.sort(noteOns, c);
 846                 Collections.sort(noteOffs, c);
 847
 848                 // Replaces each NoteOn event it with a MooNote containing a reference to the NoteOff event.
 849                 Iterator iOn = noteOns.iterator(), iOff;
 850                 MidiEvent on, off = null, nextOff;
 851                 ShortMessage onMsg, nextOffMsg;
 852                 while(iOn.hasNext()) {
 853                         on = (MidiEvent)iOn.next();
 854                         if (!(on instanceof MooNote)) {
 855                                 onMsg = (ShortMessage)on.getMessage();
 856                                 iOff = noteOffs.iterator();
 857                                 while(iOff.hasNext()) {
 858                                         nextOff = (MidiEvent)iOff.next();
 859                                         nextOffMsg = (ShortMessage)nextOff.getMessage();
 860                                         if(onMsg.getChannel() == nextOffMsg.getChannel() &&
 861                                            onMsg.getData1() == nextOffMsg.getData1() &&
 862                                            c.compare(nextOff, on) > 0) {
 863                                                 off = nextOff;
 864                                                 iOff.remove();
 865                                                 break;
 866                                         }
 867
 868                                 }
 869                                 track.remove(on);
 870                                 MooNote mn;
 871                                 if (off != null) {
 872                                         mn = new MooNote(on, off);
 873                                 } else {
 874                                         mn = new MooNote(on, new MidiEvent((ShortMessage)on.getMessage().clone(), on.getTick() + 48));
 875                                 }
 876                                 track.add(mn);
 877                                 newMooNotes.add(mn);
 878                                 iOn.remove();
 879                         }
 880                 }
 881                 return newMooNotes;
 882         }
 883
 884         /**
 885          * Loads a MIDI sequence from the given file.
 886          * @param filename      the filename to use
 887          */
 888         public static boolean load(File loadFile) {
 889                 // Loads sequence from file
 890                 try {seq = MidiSystem.getSequence(loadFile);}
 891                 catch (Exception e) {return false;}
 892                 file = loadFile;
 893                 edited = false;
 894
 895                 Track[] tracks = seq.getTracks();
 896                 reinitializeLists();
 897
 898                 // Searches track 0 for changes in tempo and time signature.
 899                 MidiEvent event;
 900                 MetaMessage metaMsg;
 901                 for (int i = 0; i < tracks[0].size(); i++) {
 902                         event = tracks[0].get(i);
 903                         if (event.getMessage().getStatus() == MetaMessage.META) {
 904                                 metaMsg = (MetaMessage)event.getMessage();
 905                                 switch(metaMsg.getType()) {
 906                                         case 81: tempoChanges.add(event); break;
 907                                         case 88: timeSignatures.add(event);
 908                                 }
 909                         }
 910                 }
 911                 Comparator c = new MidiEventComparator();
 912                 Collections.sort(tempoChanges, c);
 913                 Collections.sort(timeSignatures, c);
 914
 915                 try {
 916                         // If no time signature specified at tick 0, adds the standard one.
 917                         if (timeSignatures.size() == 0 || ((MidiEvent)timeSignatures.get(0)).getTick() != 0) {
 918                                 MetaMessage timeSigMsg = new MetaMessage();
 919                                 timeSigMsg.setMessage(88, encodeTimeSig(4, 4), 4);
 920                                 timeSignatures.add(0, new MidiEvent(timeSigMsg, (long)0));
 921                         }
 922
 923                         // If no tempo specified at tick 0, adds the standard one.
 924                         if (tempoChanges.size() == 0 || ((MidiEvent)tempoChanges.get(0)).getTick() != 0) {
 925                                 MetaMessage tempoMsg = new MetaMessage();
 926                                 tempoMsg.setMessage(81, encodeTempo(120), 3);
 927                                 tempoChanges.add(0, new MidiEvent(tempoMsg, (long)0));
 928                         }
 929                 } catch (Exception e) {}
 930
 931                 // Converts tracks.
 932                 for (int i = 0; i < tracks.length; i++) {
 933                         convertTrack(tracks[i]);
 934                 }
 935
 936                 // Sends sequence to GUI and sequencer, then returns
 937                 if (gui != null) gui.setSequence(seq, file);
 938                 try {
 939                         sequencer.setSequence(seq);
 940                 } catch (InvalidMidiDataException e) {}
 941                 return true;
 942         }
 943
 944         /**
 945          * Quantizes the given list of MIDI events
 946          * @param notes         a list of the notes to quantize
 947          * @param resolution    the note size to round each note to
 948          * @param location      whether the quantize should affect the location of the note
 949          * @param duration      whether the quantize should affect the duration of the note
 950          */
 951         public static List quantize(List notes, int resolution, boolean location, boolean duration) {
 952                 Iterator it = notes.iterator();
 953                 int noteSize = resolution * seq.getResolution() / 4;
 954                 while(it.hasNext()) {
 955                         MidiEvent note = (MidiEvent)it.next();
 956                         if (note instanceof MooNote) {
 957                                 MooNote mn = (MooNote)note;
 958                                 if (location) mn.setTick(Math.round(mn.getTick() / noteSize) * noteSize);
 959                                 if (duration) {
 960                                         int length = Math.round(mn.getDuration() / noteSize) * noteSize;
 961                                         if (length < noteSize) length = noteSize;
 962                                         mn.setDuration(length);
 963                                 }
 964                         }
 965                 }
 966                 return notes;
 967         }
 968
 969         /**
 970          * Reinitializes sequence-specific collections.
 971          */
 972         private static void reinitializeLists() {
 973                 emptyTracks     = new ArrayList();
 974                 timeSignatures  = new ArrayList();
 975                 tempoChanges    = new ArrayList();
 976                 copyBuffer      = new ArrayList();
 977                 trackSolo       = new HashMap();
 978                 trackMute       = new HashMap();
 979                 selection       = new TreeSet();
 980         }
 981
 982         /**
 983          * Loads the user preferences.
 984          */
 985         public static void loadPreferences() {
 986
 987         }
 988
 989         /**
 990          * Saves the user preferences.
 991          */
 992         public static void savePreferences() {
 993
 994         }
 995
 996         /**
 997          * Prompts the user to save any unsaved changes.
 998          */
 999         public static boolean promptOnUnsavedChanges() {
1000                 if (!edited) return false;
1001                 int exitOption = JOptionPane.showConfirmDialog(gui,
1002                         "The current sequence has been edited, but not saved.\nDo you wish to continue anyway?",
1003                         "File not saved - continue?",
1004                         JOptionPane.OK_CANCEL_OPTION,
1005                         JOptionPane.WARNING_MESSAGE);
1006                 if (exitOption == JOptionPane.CANCEL_OPTION || exitOption == JOptionPane.CLOSED_OPTION) return true;
1007                 return false;
1008         }
1009
1010         /**
1011          * Saves the current sequence to the previously given filename.
1012          */
1013         public static boolean save() {
1014                 if (file == null) return false;
1015                 else {
1016                         saveAs(file);
1017                         return true;
1018                 }
1019         }
1020
1021         /**
1022          * Saves the current sequence to the given filename
1023          * @param file  the filename to use
1024          */
1025         public static boolean saveAs(File saveFile) {
1026                 try {
1027                         MidiSystem.write(seq, 1, saveFile);
1028                         file = saveFile;
1029                         edited = false;
1030                         gui.setStatus("Saved " + file.getAbsolutePath());
1031                         return true;
1032                 } catch (IOException e) {
1033                         gui.setStatus("Failed in saving " + file.getAbsolutePath());
1034                         return false;
1035                 }
1036         }
1037
1038         /**
1039          * Prints the given string to the System output.
1040          */
1041         private static void out(String text, boolean newLine) {
1042                 if (newLine) System.out.println(text);
1043                 else System.out.print(text);
1044         }
1045
1046         /**
1047          * Advances the current progress counter by printing a "." to the System output.
1048          */
1049         private static void advanceStatus() {
1050                 out(".", false);
1051         }
1052
1053         /**
1054          * Releases all reserved devices and exits the program.
1055          */
1056         public static void quit() {
1057                 if (gui != null) {
1058                         if (promptOnUnsavedChanges()) return;
1059                 }
1060                 savePreferences();
1061                 if (sequencer.isOpen()) sequencer.close();
1062                 if (synthesizer.isOpen()) synthesizer.close();
1063                 System.exit(0);
1064         }
1065
1066         /**
1067          * A Ccmparator for sorting lists of MidiEvents.
1068          */
1069         public static class MidiEventComparator implements Comparator {
1070                 public int compare(Object o1, Object o2) {
1071                         int diff = (int)(((MidiEvent)o1).getTick() - ((MidiEvent)o2).getTick());
1072                         if (diff != 0 || !(((MidiEvent)o1).getMessage() instanceof ShortMessage) || !(((MidiEvent)o2).getMessage() instanceof ShortMessage)) return diff;
1073                         return (((ShortMessage)((MidiEvent)o1).getMessage()).getData1() - ((ShortMessage)((MidiEvent)o2).getMessage()).getData1());
1074                 }
1075         }
1076
1077         /**
1078          * The thread that updates the GUI during playback.
1079          */
1080         public static class PlayThread extends Thread {
1081                 public void run() {
1082                         Thread currentThread = Thread.currentThread();
1083                         while(currentThread == player) {
1084                                 gui.update(sequencer.getTickPosition());
1085                                 try {
1086                                         sleep(10);
1087                                 } catch (InterruptedException e) {
1088                                         Moosique.stop();
1089                                 }
1090                         }
1091                 }
1092         }
1093
1094         /**
1095          * A listener for detecting the Meta event signifying the end of the sequence.
1096          */
1097         public static class SongEndListener implements MetaEventListener {
1098                 public void meta(MetaMessage event) {
1099                         if (event.getType() == 47)
1100                                 stop();
1101                 }
1102         }
1103 }