import java.io.*;
import javax.sound.midi.*;
public class TextToMidi {
// These are some MIDI constants from the spec. They aren't defined
// for us in javax.sound.midi.
public static final int DAMPER_PEDAL = 64;
public static final int DAMPER_ON = 127;
public static final int DAMPER_OFF = 0;
public static final int END_OF_TRACK = 47;
public static void main(String[ ] args1)
throws MidiUnavailableException, InvalidMidiDataException, IOException
{
int instrument = 0;
int tempo = 120;
String filename = null;
// Parse the options
// -i <instrument number> default 0, a piano. Allowed values: 0-127
// -t <beats per minute> default tempo is 120 quarter notes per minute
// -o <filename> save to a midi file instead of playing
int a = 0;
// the tune to be played, see later in the code for comments
String [] args = {"/4 E D /2 C /4 E D /2 C /4 G F /2 E /4 G F /32 E " +
"A B C Db E F G# +A /8 D E C D E C /1>>CE CG CEGBb FAC"};
while(a < args.length) {
if (args[a].equals("-i")) {
instrument = Integer.parseInt(args[a+1]);
a+=2;
}
else if (args[a].equals("-t")) {
tempo = Integer.parseInt(args[a+1]);
a+=2;
}
else if (args[a].equals("-o")) {
filename = args[a+1];
a += 2;
}
else break;
} // end while loop on the args array
char[ ] notes = args[a].toCharArray( );
// 16 ticks per quarter note.
Sequence sequence = new Sequence(Sequence.PPQ, 16);
// Add the specified notes to the track
addTrack(sequence, instrument, tempo, notes);
if (filename == null) { // no filename, so play the notes
// Set up the Sequencer and Synthesizer objects
Sequencer sequencer = MidiSystem.getSequencer( );
sequencer.open( );
Synthesizer synthesizer = MidiSystem.getSynthesizer( );
synthesizer.open( );
sequencer.getTransmitter( ).setReceiver(synthesizer.getReceiver( ));
// Specify the sequence to play, and the tempo to play it at
sequencer.setSequence(sequence);
sequencer.setTempoInBPM(tempo);
// Let us know when it is done playing
sequencer.addMetaEventListener(new MetaEventListener( ) {
public void meta(MetaMessage m) {
// A message of this type is automatically sent
// when we reach the end of the track
if (m.getType( ) == END_OF_TRACK) System.exit(0);
}
});
// And start playing now.
sequencer.start( );
}
else { // A file name was specified, so save the notes
int[ ] allowedTypes = MidiSystem.getMidiFileTypes(sequence);
if (allowedTypes.length == 0) {
System.err.println("No supported MIDI file types.");
}
else {
MidiSystem.write(sequence, allowedTypes[0],
new File(filename));
System.exit(0);
}
} // end if-else on a file of notes to be read
} // end the main method
// global constant to define the note names
static final int[ ] offsets = { // add these amounts to the base value
// A B C D E F G
-3, -1, 0, 2, 4, 5, 7
};
/*
* This method parses the specified char[ ] of notes into a Track.
* The musical notation is the following:
* A-G: A named note; Add b for flat and # for sharp.
* +: Move up one octave. Persists.
* -: Move down one octave. Persists.
* /1: Notes are whole notes. Persists 'till changed
* /2: Half notes
* /4: Quarter notes
* /n: N can also be 8, 16, 32, 64.
* s: Toggle sustain pedal on or off (initially off)
*
* >: Louder. Persists
* <: Softer. Persists
* .: Rest. Length depends on current length setting
* Space: Play the previous note or notes; notes not separated by spaces
* are played at the same time
*/
public static void addTrack(Sequence s, int instrument, int tempo,
char[ ] notes)
throws InvalidMidiDataException
{
Track track = s.createTrack( ); // Begin with a new track
// Set the instrument on channel 0
ShortMessage sm = new ShortMessage( );
sm.setMessage(ShortMessage.PROGRAM_CHANGE, 0, instrument, 0);
track.add(new MidiEvent(sm, 0));
int n = 0; // current character in notes[ ] array
int t = 0; // time in ticks for the composition
// These values persist and apply to all notes 'till changed
int notelength = 16; // default to quarter notes
int velocity = 64; // default to middle volume
int basekey = 60; // 60 is middle C. Adjusted up and down by octave
boolean sustain = false; // is the sustain pedal depressed?
int numnotes = 0; // How many notes in current chord?
while(n < notes.length) {
char c = notes[n++];
if (c == '+') basekey += 12; // increase octave
else if (c == '-') basekey -= 12; // decrease octave
else if (c == '>') velocity += 16; // increase volume;
else if (c == '<') velocity -= 16; // decrease volume;
else if (c == '/') {
char d = notes[n++];
if (d == '2') notelength = 32; // half note
else if (d == '4') notelength = 16; // quarter note
else if (d == '8') notelength = 8; // eighth note
else if (d == '3' && notes[n++] == '2') notelength = 2;
else if (d == '6' && notes[n++] == '4') notelength = 1;
else if (d == '1') {
if (n < notes.length && notes[n] == '6')
notelength = 4; // 1/16th note
else notelength = 64; // whole note
}
}
else if (c == 's') {
sustain = !sustain;
// Change the sustain setting for channel 0
ShortMessage m = new ShortMessage( );
m.setMessage(ShortMessage.CONTROL_CHANGE, 0,
DAMPER_PEDAL, sustain?DAMPER_ON:DAMPER_OFF);
track.add(new MidiEvent(m, t));
}
else if (c >= 'A' && c <= 'G') {
int key = basekey + offsets[c - 'A'];
if (n < notes.length) {
if (notes[n] == 'b') { // flat
key--;
n++;
}
else if (notes[n] == '#') { // sharp
key++;
n++;
}
}
addNote(track, t, notelength, key, velocity);
numnotes++;
}
else if (c == ' ') {
// Spaces separate groups of notes played at the same time.
// But we ignore them unless they follow a note or notes.
if (numnotes > 0) {
t += notelength;
numnotes = 0;
}
}
else if (c == '.') {
// Rests are like spaces in that they force any previous
// note to be output (since they are never part of chords)
if (numnotes > 0) {
t += notelength;
numnotes = 0;
}
// Now add additional rest time
t += notelength;
}
}
} // end addTrack method
// A convenient method to add a note to the track on channel 0
public static void addNote(Track track, int startTick,
int tickLength, int key, int velocity)
throws InvalidMidiDataException
{
ShortMessage on = new ShortMessage( );
on.setMessage(ShortMessage.NOTE_ON, 0, key, velocity);
ShortMessage off = new ShortMessage( );
off.setMessage(ShortMessage.NOTE_OFF, 0, key, velocity);
track.add(new MidiEvent(on, startTick));
track.add(new MidiEvent(off, startTick + tickLength));
} // end addNote method
} // end TextToMidi class