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