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