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