public void go() {
setUpGui();
try {
Sequencer sequencer = MidiSystem.getSequencer();
sequencer.open();
// make a sequencer and open
sequencer.addControllerEventListener(m1, new int[] {127});
Sequence seq = new Sequence(Sequence.PPQ, 4);
Track track = seq.createTrack();
int r = 0;
for (int i = 0; i < 300; i += 4) {
r = (int) ((Math.random() * 50) + 1);
track.add(makeEvent(144, 1, r, 100, i));
track.add(makeEvent(176, 1, 127, 0, i));
track.add(makeEvent(128, 1, r, 100, i + 2));
} // end loop
sequencer.setSequence(seq);
sequencer.start();
sequencer.setTempoInBPM(120);
} catch (Exception ex) {
ex.printStackTrace();
}
} // close method
private void readTrack(DataInputStream dataInputStream, Track track)
throws InvalidMidiDataException, IOException {
// search for a "MTrk" chunk
while (true) {
int nMagic = dataInputStream.readInt();
if (nMagic == MidiConstants.TRACK_MAGIC) {
break;
}
int nChunkLength = dataInputStream.readInt();
if (nChunkLength % 2 != 0) {
nChunkLength++;
}
dataInputStream.skip(nChunkLength);
}
int nTrackChunkLength = dataInputStream.readInt();
long lTicks = 0;
long[] alRemainingBytes = new long[1];
alRemainingBytes[0] = nTrackChunkLength;
int[] anRunningStatusByte = new int[1];
// indicates no running status in effect
anRunningStatusByte[0] = -1;
while (alRemainingBytes[0] > 0) {
long lDeltaTicks = readVariableLengthQuantity(dataInputStream, alRemainingBytes);
// TDebug.out("delta ticks: " + lDeltaTicks);
lTicks += lDeltaTicks;
MidiEvent event = readEvent(dataInputStream, alRemainingBytes, anRunningStatusByte, lTicks);
track.add(event);
}
}
public boolean createEvent(int type, int num, long tick) {
ShortMessage message = new ShortMessage();
try {
message.setMessage(type + cc.num, num, cc.velocity);
MidiEvent event = new MidiEvent(message, tick);
track.add(event);
return true;
} catch (Exception ex) {
ex.printStackTrace();
return false;
}
}
public void go() {
try {
sq.open();
Sequence seq = new Sequence(Sequence.PPQ, 4);
Track track = seq.createTrack();
track.add(addNote(144, 9, 56, 100, 1));
track.add(addNote(128, 9, 56, 100, 4));
sq.setSequence(seq);
sq.setTempoInBPM(tempo);
sq.setLoopCount(Sequencer.LOOP_CONTINUOUSLY);
sq.start();
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* Create a note and add it to the track.
*
* @param note The MIDI value for the note to be played
* @param startTime When this note should be played
* @param duration How long the note should last
*/
private void createNote(Note note, int startTime, int duration, Track track) {
int endTime = startTime + duration;
int midiNumber = note.getMidiNumber();
track.add(createNoteEvent(ShortMessage.NOTE_ON, midiNumber, startTime, VELOCITY));
track.add(createNoteEvent(ShortMessage.NOTE_OFF, midiNumber, endTime, 0));
}