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
{
try {
sq = MidiSystem.getSequencer();
} catch (MidiUnavailableException e) {
e.printStackTrace();
}
}
/** Creates a new MidiPlayer object. */
public MidiPlayer() {
try {
sequencer = MidiSystem.getSequencer();
sequencer.open();
sequencer.addMetaEventListener(this);
} catch (MidiUnavailableException ex) {
sequencer = null;
}
}
/**
* Sets up the sequencer with a given sequence.
*
* @param sequenceToUse
* @throws MidiUnavailableException
*/
private void setUpSequencer() throws MidiUnavailableException {
// First, get the system's default sequencer.
try {
sequencer = MidiSystem.getSequencer();
} catch (MidiUnavailableException ex) {
// Something went wrong.
ex.printStackTrace();
System.exit(1);
}
// If there is none, throw an exception.
if (sequencer == null) {
String msg = "Cannot find a sequencer";
throw new MidiUnavailableException(msg);
}
// Set up the transmitter and receiver of the synth to play the song.
linkTransmitterToReceiver();
}
private static void playMidi(String name, boolean loop, double volume)
throws MidiUnavailableException, FileNotFoundException, IOException,
InvalidMidiDataException {
// Obtains the default Sequencer connected to a default device.
Sequencer sequencer = MidiSystem.getSequencer();
// Opens the device, indicating that it should now acquire any system resources it requires and
// become operational.
sequencer.open();
// create a stream from a file
InputStream is = new BufferedInputStream(new FileInputStream(new File(path + name)));
// Sets the current sequence on which the sequencer operates.
// The stream must point to MIDI file data.
sequencer.setSequence(is);
// Set looping
if (loop) {
sequencer.setLoopCount(LOOP_CONTINUOUSLY);
}
// Starts playback of the MIDI data in the currently loaded sequence.
sequencer.start();
midiMap.put(name, sequencer);
}
public boolean open() {
try {
if (synthesizer == null) {
if ((synthesizer = MidiSystem.getSynthesizer()) == null) {
System.out.println("getSynthesizer() failed!");
return false;
}
}
synthesizer.open();
sequencer = MidiSystem.getSequencer();
sequencer.addMetaEventListener(new ProcessMeta());
sequence = new Sequence(Sequence.PPQ, 10);
} catch (Exception ex) {
System.out.println("midi exception 1 ");
ex.printStackTrace();
return false;
}
System.out.println("midi opening");
Soundbank sb = synthesizer.getDefaultSoundbank();
if (sb != null) {
instruments = synthesizer.getDefaultSoundbank().getInstruments();
synthesizer.loadInstrument(instruments[0]);
}
MidiChannel midiChannels[] = synthesizer.getChannels();
numChannels = midiChannels.length;
channels = new ChannelData[midiChannels.length];
if (channels.length == 0) return false;
for (int i = 0; i < channels.length; i++) {
channels[i] = new ChannelData(midiChannels[i], i);
}
cc = channels[0];
return true;
}
