private InputStream writeTrack(Track track, int type)
throws IOException, InvalidMidiDataException {
int bytesWritten = 0;
int lastBytesWritten = 0;
int size = track.size();
PipedOutputStream thpos = new PipedOutputStream();
DataOutputStream thdos = new DataOutputStream(thpos);
PipedInputStream thpis = new PipedInputStream(thpos);
ByteArrayOutputStream tdbos = new ByteArrayOutputStream();
tddos = new DataOutputStream(tdbos);
ByteArrayInputStream tdbis = null;
SequenceInputStream fStream = null;
long currentTick = 0;
long deltaTick = 0;
long eventTick = 0;
int runningStatus = -1;
// -----------------------------
// Write each event in the track
// -----------------------------
for (int i = 0; i < size; i++) {
MidiEvent event = track.get(i);
int status;
int eventtype;
int metatype;
int data1, data2;
int length;
byte data[] = null;
ShortMessage shortMessage = null;
MetaMessage metaMessage = null;
SysexMessage sysexMessage = null;
// get the tick
// $$jb: this gets easier if we change all system-wide time to delta ticks
eventTick = event.getTick();
deltaTick = event.getTick() - currentTick;
currentTick = event.getTick();
// get the status byte
status = event.getMessage().getStatus();
eventtype = getType(status);
switch (eventtype) {
case ONE_BYTE:
shortMessage = (ShortMessage) event.getMessage();
data1 = shortMessage.getData1();
bytesWritten += writeVarInt(deltaTick);
if (status != runningStatus) {
runningStatus = status;
tddos.writeByte(status);
bytesWritten += 1;
}
tddos.writeByte(data1);
bytesWritten += 1;
break;
case TWO_BYTE:
shortMessage = (ShortMessage) event.getMessage();
data1 = shortMessage.getData1();
data2 = shortMessage.getData2();
bytesWritten += writeVarInt(deltaTick);
if (status != runningStatus) {
runningStatus = status;
tddos.writeByte(status);
bytesWritten += 1;
}
tddos.writeByte(data1);
bytesWritten += 1;
tddos.writeByte(data2);
bytesWritten += 1;
break;
case SYSEX:
sysexMessage = (SysexMessage) event.getMessage();
length = sysexMessage.getLength();
data = sysexMessage.getMessage();
bytesWritten += writeVarInt(deltaTick);
// $$jb: 04.08.99: always write status for sysex
runningStatus = status;
tddos.writeByte(data[0]);
bytesWritten += 1;
// $$jb: 10.18.99: we don't maintain length in
// the message data for SysEx (it is not transmitted
// over the line), so write the calculated length
// minus the status byte
bytesWritten += writeVarInt((data.length - 1));
// $$jb: 10.18.99: now write the rest of the
// message
tddos.write(data, 1, (data.length - 1));
bytesWritten += (data.length - 1);
break;
case META:
metaMessage = (MetaMessage) event.getMessage();
length = metaMessage.getLength();
data = metaMessage.getMessage();
bytesWritten += writeVarInt(deltaTick);
// $$jb: 10.18.99: getMessage() returns the
// entire valid midi message for a file,
// including the status byte and the var-length-int
// length value, so we can just write the data
// here. note that we must _always_ write the
// status byte, regardless of runningStatus.
runningStatus = status;
tddos.write(data, 0, data.length);
bytesWritten += data.length;
break;
case IGNORE:
// ignore this event
break;
case ERROR:
// ignore this event
break;
default:
throw new InvalidMidiDataException("internal file writer error");
}
}
// ---------------------------------
// End write each event in the track
// ---------------------------------
// Build Track header now that we know length
thdos.writeInt(MTrk_MAGIC);
thdos.writeInt(bytesWritten);
bytesWritten += 8;
// Now sequence them
tdbis = new ByteArrayInputStream(tdbos.toByteArray());
fStream = new SequenceInputStream(thpis, tdbis);
thdos.close();
tddos.close();
return fStream;
}
public int sendSysex(SysexMessage msg) {
return sendSysex(msg.getMessage());
}
