Moosique.java

   1 import javax.sound.midi.*;
   2 import javax.swing.*;
   3 import java.io.*;
   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         private static boolean playing = false;
  26
  27         /**
  28          * Starts the application.
  29          */
  30         public static void main (String[] args) {
  31                 System.out.println("\nMoosique version 1.0\n");
  32
  33                 // Parses command-line arguments.
  34                 for (int i = 0; i < args.length; i++) {
  35                         if (args[i].equals("-n")) {makeGUI = false;}
  36                         else if (fileArg == null) {fileArg = args[i];}
  37                 }
  38
  39                 // Acquires MIDI devices and connects them.
  40                 System.out.print("Initializing MIDI devices.");
  41                 try {
  42                         sequencer = MidiSystem.getSequencer();
  43                         System.out.print(".");
  44                         sequencer.open();
  45                         synthesizer = MidiSystem.getSynthesizer();
  46                         System.out.print(".");
  47                         synthesizer.open();
  48                         sequencer.getTransmitter().setReceiver(synthesizer.getReceiver());
  49                         channels = synthesizer.getChannels();
  50                         setActiveChannel(0);
  51                 } catch (MidiUnavailableException e) {
  52                         System.out.println("Failed, quitting.");
  53                         quit();
  54                 }
  55                 System.out.println("Done");
  56
  57                 //If a filename is given as the command-line argument, attempts to load a sequence from the file.
  58                 if (fileArg != null) {
  59                         System.out.print("Loading MIDI sequence from " + fileArg + "...");
  60                         if (!load(fileArg)) {
  61                                 System.out.println("Failed");
  62                                 clearSequence();
  63                         } else {
  64                                 System.out.println("Done");
  65                         }
  66                 } else {
  67                         // Otherwise creates a new empty one.
  68                         clearSequence();
  69                 }
  70
  71                 // If n-flag is set, plays song and then exits. Otherwise builds GUI.
  72                 if (makeGUI) {
  73                         System.out.print("Building GUI...");
  74                         gui = new MooGUI(seq);
  75                         System.out.println("Done");
  76                 } else {
  77                         System.out.print("Playing...");
  78                         play();
  79                         while (sequencer.isRunning()) {}
  80                         System.out.println("Done");
  81                         quit();
  82                 }
  83         }
  84
  85         /**
  86          * Returns the GUI.
  87          * @return the GUI
  88          */
  89         public static MooGUI getGUI() {
  90                 return gui;
  91         }
  92
  93         /**
  94          * Returns the current sequence.
  95          * @return the current sequence
  96          */
  97         public static Sequence getSequence() {
  98                 return seq;
  99         }
 100
 101         /**
 102          * Returns the current sequencer.
 103          * @return the current sequencer
 104          */
 105         public static Sequencer getSequencer() {
 106                 return sequencer;
 107         }
 108
 109         /**
 110          * Returns the MidiChannels of the selected synthesizer.
 111          * @return the available MidiChannels
 112          */
 113         public static MidiChannel[] getChannels() {
 114                 return channels;
 115         }
 116
 117         /**
 118          * Returns the currently active MidiChannel.
 119          * @return the active MidiChannel
 120          */
 121         public static MidiChannel getActiveChannel() {
 122                 return activeChannel;
 123         }
 124
 125         /**
 126          * Sets the currently active MidiChannel.
 127          * @param channel       the number of the MidiChannel to activate
 128          */
 129         public static void setActiveChannel(int channel) {
 130                 activeChannel = channels[channel];
 131         }
 132
 133         /**
 134          * Replaces the current sequence with a new one, holding three empty tracks.
 135          */
 136         public static void clearSequence() {
 137                 // Creates a new sequence and sends it to the sequencer.
 138                 try {
 139                         seq = new Sequence(Sequence.PPQ, 96, 3);
 140                         sequencer.setSequence(seq);
 141                 } catch (InvalidMidiDataException e) {}
 142                 // Sends sequence to GUI.
 143                 if (gui != null) gui.setSequence(seq);
 144         }
 145
 146         /**
 147          * Starts playback of the current sequence.
 148          */
 149         public static void play() {
 150                 playing = true;
 151                 sequencer.setTickPosition(position);
 152                 sequencer.start();
 153         }
 154
 155         /**
 156          * Pauses playback of the current sequence.
 157          */
 158         public static void pause() {
 159                 playing = false;
 160                 sequencer.stop();
 161         }
 162
 163         /**
 164          * Resumes playback of the current sequence.
 165          */
 166         public static void resume() {
 167                 playing = true;
 168                 sequencer.start();
 169         }
 170
 171         /**
 172          * Stops playback of the current sequence.
 173          */
 174         public static void stop() {
 175                 playing = false;
 176                 sequencer.stop();
 177                 sequencer.setTickPosition(position);
 178         }
 179
 180         /**
 181          * Pauses if playing and resumes if stopped.
 182          */
 183         public static void resumepause()
 184         {
 185                 if (playing)
 186                         pause();
 187                 else
 188                         resume();
 189         }
 190
 191         /**
 192          * Rewinds the current sequence the given number of measures.
 193          * @param measures      the number of measures to rewind
 194          */
 195         public static long getPosition() {
 196                 return position;
 197         }
 198
 199         /**
 200          * Rewinds the current sequence the given number of measures.
 201          * @param measures      the number of measures to rewind
 202          */
 203         public static void setPosition(long ticks) {
 204                 position = ticks;
 205         }
 206
 207         /**
 208          * Rewinds the current sequence the given number of measures.
 209          * @param measures      the number of measures to rewind
 210          */
 211         public static void rewind(long ticks) {
 212                 setPosition(position - ticks);
 213         }
 214
 215         /**
 216          * Fast forwards the current sequence the given number of measures.
 217          * @param measures      the number of measures to fast forward
 218          */
 219         public static void forward(long ticks) {
 220                 setPosition(position + ticks);
 221         }
 222
 223         /**
 224          * Loads the MooSequence in the given file.
 225          * @param filename      the filename to use
 226          */
 227         public static boolean load(String file) {
 228                 // Loads sequence from file
 229                 filename = file;
 230                 try {
 231                         seq = MidiSystem.getSequence(new File(filename));
 232                 } catch (InvalidMidiDataException e) {
 233                         return false;
 234                 } catch (IOException e) {
 235                         JOptionPane.showMessageDialog(null, "Error 404", "File Not Found", JOptionPane.ERROR_MESSAGE);
 236                         return false;
 237                 }
 238
 239                 // Sends sequence to GUI and sequencer
 240                 if (gui != null) gui.setSequence(seq);
 241                 try {
 242                         sequencer.setSequence(seq);
 243                 } catch (InvalidMidiDataException e) {}
 244
 245                 // Searches the sequence for NoteOn events
 246                 Track[] tracks = seq.getTracks();
 247                 MidiEvent noteOn, noteOff = null, nextEvent;
 248                 MidiMessage nextMsg;
 249                 ShortMessage shortMsg;
 250                 for (int i = 0; i < tracks.length; i++) {
 251                         for (int j = 0; j < tracks[i].size(); j++) {
 252                                 noteOn = tracks[i].get(j);
 253                                 if (noteOn.getMessage() instanceof ShortMessage) {
 254                                         if (((ShortMessage)noteOn.getMessage()).getCommand() == ShortMessage.NOTE_ON) {
 255                                                 // Finds the corresponding NoteOff event
 256                                                 for (int k = j + 1; k < tracks[i].size(); k++) {
 257                                                         nextEvent = tracks[i].get(k);
 258                                                         nextMsg = nextEvent.getMessage();
 259                                                         if (nextMsg instanceof ShortMessage) {
 260                                                                 shortMsg = (ShortMessage) nextMsg;
 261                                                                 if (shortMsg.getCommand() == ShortMessage.NOTE_OFF && shortMsg.getChannel() == ((ShortMessage)noteOn.getMessage()).getChannel() && shortMsg.getData1() == ((ShortMessage)noteOn.getMessage()).getData1()) {
 262                                                                         noteOff = nextEvent;
 263                                                                         break;
 264                                                                 }
 265                                                         }
 266                                                 }
 267                                                 // Replaces the NoteOn event with a MooNote, if possible with the corresponding NoteOff event
 268                                                 tracks[i].remove(noteOn);
 269                                                 if (noteOff != null) {
 270                                                         tracks[i].add(new MooNote(noteOn, noteOff));
 271                                                 } else {
 272                                                         tracks[i].add(new MooNote(noteOn));
 273                                                 }
 274                                         }
 275                                 }
 276                         }
 277                 }
 278                 return true;
 279         }
 280
 281         /**
 282          * Saves the current sequence to the given filename
 283          * @param file  the filename to use
 284          */
 285         public static void saveAs(String file) {
 286                 try {
 287                         MidiSystem.write(seq, 1, new File(filename));
 288                 } catch (IOException e) {}
 289                 filename = file;
 290         }
 291
 292         /**
 293          * Saves the current sequence to the previously given filename.
 294          */
 295         public static void save() {
 296                 saveAs(filename);
 297         }
 298
 299         /**
 300          * Releases all reserved devices and exits the program.
 301          */
 302         public static void quit() {
 303                 if (sequencer.isOpen()) sequencer.close();
 304                 if (synthesizer.isOpen()) synthesizer.close();
 305                 System.exit(0);
 306         }
 307 }