Moosique.java

   1 import javax.sound.midi.*;
   2 import java.io.*;
   3 import javax.swing.*;
   4
   5 /**
   6  * Moosique - The MIDI Tracker
   7  *
   8  * Main class that handles initiation, IO and sound.
   9  *
  10  * @author  Einar Pehrson
  11  */
  12
  13 public class Moosique {
  14
  15         private static MooGUI gui;
  16         private static Sequence seq;
  17         private static Sequencer sequencer;
  18         private static Synthesizer synthesizer;
  19         private static MidiChannel[] channels;
  20         private static MidiChannel activeChannel;
  21
  22         private static String filename, fileArg;
  23         private static long position;
  24         private static boolean makeGUI = true;
  25
  26         /**
  27          * Starts the application.
  28          */
  29         public static void main (String[] args) {
  30                 System.out.println("\nMoosique version 1.0\n");
  31
  32                 // Parses command-line arguments.
  33                 for (int i = 0; i < args.length; i++) {
  34                         if (args[i].equals("-n")) {makeGUI = false;}
  35                         else if (fileArg == null) {fileArg = args[i];}
  36                 }
  37
  38                 // Acquires MIDI devices and connects them.
  39                 System.out.print("Initializing MIDI devices.");
  40                 try {
  41                         sequencer = MidiSystem.getSequencer();
  42                         System.out.print(".");
  43                         sequencer.open();
  44                         synthesizer = MidiSystem.getSynthesizer();
  45                         System.out.print(".");
  46                         synthesizer.open();
  47                         sequencer.getTransmitter().setReceiver(synthesizer.getReceiver());
  48                         channels = synthesizer.getChannels();
  49                         setActiveChannel(0);
  50                 } catch (MidiUnavailableException e) {
  51                         System.out.println("Failed, quitting.");
  52                         quit();
  53                 }
  54                 System.out.println("Done");
  55
  56                 //If a filename is given as the command-line argument, attempts to load a sequence from the file.
  57                 if (fileArg != null) {
  58                         System.out.print("Loading MIDI sequence from " + fileArg + "...");
  59                         if (!load(fileArg)) {
  60                                 System.out.println("Failed");
  61                                 clearSequence();
  62                         } else {
  63                                 System.out.println("Done");
  64                         }
  65                 } else {
  66                         // Otherwise creates a new empty one.
  67                         clearSequence();
  68                 }
  69
  70                 // Builds GUI, unless n-flag is set.
  71                 if (makeGUI) {
  72                         System.out.print("Building GUI...");
  73                         try {
  74                                 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  75                         } catch (Exception e) {}
  76                         gui = new MooGUI(seq);
  77                         System.out.println("Done");
  78                 } else {
  79                         System.out.print("Playing...");
  80                         play();
  81                         while (sequencer.isRunning()) {}
  82                         System.out.println("Done");
  83                         quit();
  84                 }
  85         }
  86
  87         /**
  88          * Returns the GUI.
  89          * @return the GUI
  90          */
  91         public static MooGUI getGUI() {
  92                 return gui;
  93         }
  94
  95         /**
  96          * Returns the current sequence.
  97          * @return the current sequence
  98          */
  99         public static Sequence getSequence() {
 100                 return seq;
 101         }
 102
 103         /**
 104          * Returns the current sequencer.
 105          * @return the current sequencer
 106          */
 107         public static Sequencer getSequencer() {
 108                 return sequencer;
 109         }
 110
 111         /**
 112          * Returns the MidiChannels of the selected synthesizer.
 113          * @return the available MidiChannels
 114          */
 115         public static MidiChannel[] getChannels() {
 116                 return channels;
 117         }
 118
 119         /**
 120          * Returns the currently active MidiChannel.
 121          * @return the active MidiChannel
 122          */
 123         public static MidiChannel getActiveChannel() {
 124                 return activeChannel;
 125         }
 126
 127         /**
 128          * Sets the currently active MidiChannel.
 129          * @param channel       the number of the MidiChannel to activate
 130          */
 131         public static void setActiveChannel(int channel) {
 132                 activeChannel = channels[channel];
 133         }
 134
 135         /**
 136          * Replaces the current sequence with a new one, holding three empty tracks.
 137          */
 138         public static void clearSequence() {
 139                 // Creates a new sequence and sends it to the sequencer.
 140                 try {
 141                         seq = new Sequence(Sequence.PPQ, 96, 3);
 142                         sequencer.setSequence(seq);
 143                 } catch (InvalidMidiDataException e) {}
 144                 // Sends sequence to GUI.
 145                 if (gui != null) gui.setSequence(seq);
 146         }
 147
 148         /**
 149          * Starts playback of the current sequence.
 150          */
 151         public static void play() {
 152                 sequencer.setTickPosition(position);
 153                 sequencer.start();
 154         }
 155
 156         /**
 157          * Pauses playback of the current sequence.
 158          */
 159         public static void pause() {
 160                 sequencer.stop();
 161         }
 162
 163         /**
 164          * Resumes playback of the current sequence.
 165          */
 166         public static void resume() {
 167                 sequencer.start();
 168         }
 169
 170         /**
 171          * Stops playback of the current sequence.
 172          */
 173         public static void stop() {
 174                 sequencer.stop();
 175                 sequencer.setTickPosition(position);
 176         }
 177
 178         /**
 179          * Rewinds the current sequence the given number of measures.
 180          * @param measures      the number of measures to rewind
 181          */
 182         public static long getPosition() {
 183                 return position;
 184         }
 185
 186         /**
 187          * Rewinds the current sequence the given number of measures.
 188          * @param measures      the number of measures to rewind
 189          */
 190         public static void setPosition(long ticks) {
 191                 position = ticks;
 192         }
 193
 194         /**
 195          * Rewinds the current sequence the given number of measures.
 196          * @param measures      the number of measures to rewind
 197          */
 198         public static void rewind(long ticks) {
 199                 setPosition(position - ticks);
 200         }
 201
 202         /**
 203          * Fast forwards the current sequence the given number of measures.
 204          * @param measures      the number of measures to fast forward
 205          */
 206         public static void forward(long ticks) {
 207                 setPosition(position + ticks);
 208         }
 209
 210         /**
 211          * Loads the MooSequence in the given file.
 212          * @param filename      the filename to use
 213          */
 214         public static boolean load(String file) {
 215                 // Loads sequence from file
 216                 filename = file;
 217                 try {
 218                         seq = MidiSystem.getSequence(new File(filename));
 219                 } catch (InvalidMidiDataException e) {
 220                         return false;
 221                 } catch (IOException e) {
 222                         return false;
 223                 }
 224
 225                 // Sends sequence to GUI and sequencer
 226                 if (gui != null) gui.setSequence(seq);
 227                 try {
 228                         sequencer.setSequence(seq);
 229                 } catch (InvalidMidiDataException e) {}
 230
 231                 // Searches the sequence for NoteOn events
 232                 Track[] tracks = seq.getTracks();
 233                 MidiEvent noteOn, noteOff = null, nextEvent;
 234                 MidiMessage nextMsg;
 235                 ShortMessage shortMsg;
 236                 for (int i = 0; i < tracks.length; i++) {
 237                         for (int j = 0; j < tracks[i].size(); j++) {
 238                                 noteOn = tracks[i].get(j);
 239                                 if (noteOn.getMessage() instanceof ShortMessage) {
 240                                         if (((ShortMessage)noteOn.getMessage()).getCommand() == ShortMessage.NOTE_ON) {
 241                                                 // Finds the corresponding NoteOff event
 242                                                 for (int k = j + 1; k < tracks[i].size(); k++) {
 243                                                         nextEvent = tracks[i].get(k);
 244                                                         nextMsg = nextEvent.getMessage();
 245                                                         if (nextMsg instanceof ShortMessage) {
 246                                                                 shortMsg = (ShortMessage) nextMsg;
 247                                                                 if (shortMsg.getCommand() == ShortMessage.NOTE_OFF && shortMsg.getChannel() == ((ShortMessage)noteOn.getMessage()).getChannel() && shortMsg.getData1() == ((ShortMessage)noteOn.getMessage()).getData1()) {
 248                                                                         noteOff = nextEvent;
 249                                                                         break;
 250                                                                 }
 251                                                         }
 252                                                 }
 253                                                 // Replaces the NoteOn event with a MooNote, if possible with the corresponding NoteOff event
 254                                                 tracks[i].remove(noteOn);
 255                                                 if (noteOff != null) {
 256                                                         tracks[i].add(new MooNote(noteOn, noteOff));
 257                                                 } else {
 258                                                         tracks[i].add(new MooNote(noteOn));
 259                                                 }
 260                                         }
 261                                 }
 262                         }
 263                 }
 264                 return true;
 265         }
 266
 267         /**
 268          * Saves the current sequence to the given filename
 269          * @param file  the filename to use
 270          */
 271         public static void saveAs(String file) {
 272                 try {
 273                         MidiSystem.write(seq, 1, new File(filename));
 274                 } catch (IOException e) {}
 275                 filename = file;
 276         }
 277
 278         /**
 279          * Saves the current sequence to the previously given filename.
 280          */
 281         public static void save() {
 282                 saveAs(filename);
 283         }
 284
 285         /**
 286          * Releases all reserved devices and exits the program.
 287          */
 288         public static void quit() {
 289                 if (sequencer.isOpen()) sequencer.close();
 290                 if (synthesizer.isOpen()) synthesizer.close();
 291                 System.exit(0);
 292         }
 293 }