/**
* Constructor. It breaks a Song into its MidiEvent components, and adds them together in order to
* create a MIDI file.
*
* @param song The song to export
*/
public MidiExporter() {
// Create the Sequence that will contain everything
try {
sequence = new Sequence(Sequence.PPQ, 2);
} catch (InvalidMidiDataException ex) {
ex.printStackTrace();
System.exit(1);
}
}
public static void main(String[] args) throws Exception {
String portName = null;
String portVersion = null;
String portVendor = null;
String portDesc = null;
String ymzFilename = null;
boolean invalid = true;
LinkedList<String> list = new LinkedList<>(Arrays.asList(args));
argCheck:
while (!list.isEmpty()) {
String arg = list.removeFirst();
switch (arg) {
case "--midi-name":
if (list.isEmpty()) {
break argCheck;
}
portName = list.removeFirst();
break;
case "--midi-version":
if (list.isEmpty()) {
break argCheck;
}
portVersion = list.removeFirst();
break;
case "--midi-vendor":
if (list.isEmpty()) {
break argCheck;
}
portVendor = list.removeFirst();
break;
case "--midi-desc":
if (list.isEmpty()) {
break argCheck;
}
portDesc = list.removeFirst();
break;
default:
ymzFilename = arg;
invalid = false;
break argCheck;
}
}
if (invalid || !(list.isEmpty())) {
usage();
System.exit(1);
}
File input = new File(ymzFilename);
YMZPlayer player = new YMZPlayer(input);
player.play(portName, portVersion, portVendor, portDesc);
}
/**
* Create the MidiEvent for a note, given the data.
*
* @param command The command value for the ShortMessage
* @param note The MIDI value for the note to be played
* @param eventTime When this event should occur
* @param velocity The velocity of this note
* @return The MidiEvent for the note
*/
private MidiEvent createNoteEvent(int command, int note, int eventTime, int velocity) {
// Create the message and set its parameters to the ones given.
ShortMessage message = new ShortMessage();
try {
message.setMessage(command, 0, note, velocity);
} catch (InvalidMidiDataException ex) {
// Something went wrong.
ex.printStackTrace();
System.exit(1);
}
// Create the MidiEvent and return it.
return new MidiEvent(message, eventTime);
}
/**
* Exports to a file.
*
* @param outputFileName The output file name
* @throws InvalidFileFormatException If the file name doesn't end in .mid or .midi
*/
public void exportToFile(String outputFileName) throws InvalidFileFormatException {
// Check for a valid file format.
if (!outputFileName.endsWith(".mid") && !outputFileName.endsWith(".midi")) {
String msg = "File names must end in .mid or .midi";
throw new InvalidFileFormatException(msg);
}
// Find a supported file type, and export the file.
int[] types = MidiSystem.getMidiFileTypes(sequence);
try {
File outputFile = new File(outputFileName);
MidiSystem.write(sequence, types[0], outputFile);
} catch (IOException ex) {
ex.printStackTrace();
System.exit(1);
}
}
/**
* 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();
}
/** Gets the default transmitter and receiver, and then links them. */
private void linkTransmitterToReceiver() {
try {
// Set up the sequencer (including its tempo)
sequencer.open();
sequencer.setSequence(sequence);
sequencer.setTempoInBPM(song.getBPM());
// Get the system's default synthesizer and set that up, too.
Synthesizer synth = MidiSystem.getSynthesizer();
synth.open();
// Get the receiver and transmitter to use and set those up.
Receiver receiver = synth.getReceiver();
Transmitter transmitter = sequencer.getTransmitter();
transmitter.setReceiver(receiver);
} catch (Exception ex) {
// Something went wrong.
ex.printStackTrace();
System.exit(1);
}
}
public void play(int instrument, int note) {
try {
Sequencer player = MidiSystem.getSequencer();
player.open();
Sequence seq = new Sequence(Sequence.PPQ, 4);
Track track = seq.createTrack();
// MidiEvent event = null;
ShortMessage first = new ShortMessage();
first.setMessage(192, 1, instrument, 0);
MidiEvent changeInstrument = new MidiEvent(first, 1);
track.add(changeInstrument);
ShortMessage a = new ShortMessage();
a.setMessage(144, 1, note, 100);
MidiEvent noteOn = new MidiEvent(a, 1);
track.add(noteOn);
ShortMessage b = new ShortMessage();
b.setMessage(128, 1, note, 100);
MidiEvent noteOff = new MidiEvent(b, 16);
track.add(noteOff);
player.setSequence(seq);
player.start();
Thread.sleep(2000);
player.close();
System.exit(0);
} catch (Exception ex) {
System.out.println(ex.getMessage());
ex.printStackTrace();
}
} // close play
