/** Print all MIDI tracks and MIDI events */
public void print() {
Enumeration aEnum = trackList.elements();
while (aEnum.hasMoreElements()) {
Track track = (Track) aEnum.nextElement();
track.print();
}
}
/**
* Write the Track Chunk
*
* @param DataOutputStream dos
* @param Track track - track to write
* @exception IOException
*/
private void writeTrackChunk(DataOutputStream odos, Track track) throws IOException {
if (VERBOSE) System.out.println("Writing MIDI Track");
// Write to temporary stream to buffer disk writes and
// calculate the number of bytes written to the stream
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
int header = 0x4D54726B;
Enumeration aEnum = track.getEvtList().elements();
aEnum = track.getEvtList().elements();
// At this stage Except that all events are NoteOn events
while (aEnum.hasMoreElements()) {
Event evt = (Event) aEnum.nextElement();
evt.write(dos);
if (DEBUG) evt.print();
}
// Write to the real stream
odos.writeInt(header);
odos.writeInt(baos.size());
odos.write(baos.toByteArray(), 0, baos.size());
}
/**
* Reads a MIDI track chunk
*
* @param DataInputStream dis - the input stream to read from
* @exception IOException
*/
private void readTrackChunk(DataInputStream dis) throws IOException {
// local variables for Track class
Track track = new Track();
// Insert new Track into a list of tracks
this.trackList.addElement(track);
int deltaTime = 0;
if (VERBOSE) System.out.println("Reading Track ..........");
// Read track header
if (dis.readInt() != 0x4D54726B) { // If MTrk read is wrong
throw new IOException("Track started in wrong place!!!! ABORTING");
} else { // If MTrk read ok get bytesRemaining
dis.readInt();
}
// loop variables
int status, oldStatus = 0, eventLength = 0;
// Start gathering event data
Event event = null;
while (true) {
try {
// get variable length timestamp
deltaTime = MidiUtil.readVarLength(dis);
// mark stream so we can return if we need running status
dis.mark(2);
status = dis.readUnsignedByte();
// decide on running status
if (status < 0x80) { // set running status
status = oldStatus;
// return stream to before status read
dis.reset();
}
// create default event of correct type
if (status >= 0xFF) { // Meta Event
int type = dis.readUnsignedByte();
eventLength = MidiUtil.readVarLength(dis);
event = MidiUtil.createMetaEvent(type);
} else if (status >= 0xF0) { // System Exclusive --- NOT SUPPORTED
System.out.println("SysEX---");
eventLength = MidiUtil.readVarLength(dis);
} else if (status >= 0x80) { // MIDI voice event
short selection = (short) (status / 0x10);
short midiChannel = (short) (status - (selection * 0x10));
VoiceEvt evt = (VoiceEvt) MidiUtil.createVoiceEvent(selection);
evt.setMidiChannel(midiChannel);
event = evt;
if (event == null) {
throw new IOException("MIDI file read error: invalid voice event type!");
}
}
oldStatus = status;
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
if (event != null) {
// read data into the new event and
// add the new event to the Track object
event.setTime(deltaTime);
event.read(dis);
// if (VERBOSE) event.print();
track.addEvent(event);
// event.print();
if (event instanceof EndTrack) break;
} else {
// skip the stream ahead to next valid event
dis.skipBytes(eventLength);
}
}
}