// Is called by Java MIDI libraries for each MIDI message encountered.
public void send(MidiMessage message, long timeStamp) {
if (message.getStatus() > 127 && message.getStatus() < 144) { // Note OFF
// Convert the MIDI channel being used to the controller pin on the
// Arduino by multipying by 2.
byte pin = (byte) (2 * (message.getStatus() - 127));
System.out.println("Got note OFF on pin: " + (pin & 0xFF));
mb.sendEvent(pin, 0);
currentPeriod[message.getStatus() - 128] = 0;
} else if (message.getStatus() > 143 && message.getStatus() < 160) { // Note ON
// Convert the MIDI channel being used to the controller pin on the
// Arduino by multipying by 2.
byte pin = (byte) (2 * (message.getStatus() - 143));
// Get note number from MIDI message, and look up the period.
// NOTE: Java bytes range from -128 to 127, but we need to make them
// 0-255 to use for lookups. & 0xFF does the trick.
// After looking up the period, devide by (the Arduino resolution * 2).
// The Arduino's timer will only tick once per X microseconds based on the
// resolution. And each tick will only turn the pin on or off. So a full
// on-off cycle (one step on the floppy) is two periods.
int period = microPeriods[(message.getMessage()[1] & 0xff)] / (ARDUINO_RESOLUTION * 2);
System.out.println("Got note ON on pin: " + (pin & 0xFF) + " with period " + period);
System.out.println(message.getLength() + " " + message.getMessage()[message.getLength() - 1]);
// Zero velocity events turn off the pin.
if (message.getMessage()[2] == 0) {
mb.sendEvent(pin, 0);
currentPeriod[message.getStatus() - 144] = 0;
} else {
mb.sendEvent(pin, period);
currentPeriod[message.getStatus() - 144] = period;
}
} else if (message.getStatus() > 223 && message.getStatus() < 240) { // Pitch bends
// Only proceed if the note is on (otherwise, no pitch bending)
if (currentPeriod[message.getStatus() - 224] != 0) {
// Convert the MIDI channel being used to the controller pin on the
// Arduino by multipying by 2.
byte pin = (byte) (2 * (message.getStatus() - 223));
double pitchBend =
((message.getMessage()[2] & 0xff) << 8) + (message.getMessage()[1] & 0xff);
int period =
(int)
(currentPeriod[message.getStatus() - 224]
/ Math.pow(2.0, (pitchBend - 8192) / 8192));
System.out.println(currentPeriod[message.getStatus() - 224] + "-" + period);
mb.sendEvent(pin, period);
}
}
}
/** return true if the passed message is Meta End Of Track */
public static boolean isMetaEndOfTrack(MidiMessage midiMsg) {
// first check if it is a META message at all
if (midiMsg.getLength() != 3 || midiMsg.getStatus() != MetaMessage.META) {
return false;
}
// now get message and check for end of track
byte[] msg = midiMsg.getMessage();
return ((msg[1] & 0xFF) == META_END_OF_TRACK_TYPE) && (msg[2] == 0);
}
/** return if the given message is a meta tempo message */
public static boolean isMetaTempo(MidiMessage midiMsg) {
// first check if it is a META message at all
if (midiMsg.getLength() != 6 || midiMsg.getStatus() != MetaMessage.META) {
return false;
}
// now get message and check for tempo
byte[] msg = midiMsg.getMessage();
// meta type must be 0x51, and data length must be 3
return ((msg[1] & 0xFF) == META_TEMPO_TYPE) && (msg[2] == 3);
}
/**
* parses this message for a META tempo message and returns the tempo in MPQ, or -1 if this isn't
* a tempo message
*/
public static int getTempoMPQ(MidiMessage midiMsg) {
// first check if it is a META message at all
if (midiMsg.getLength() != 6 || midiMsg.getStatus() != MetaMessage.META) {
return -1;
}
byte[] msg = midiMsg.getMessage();
if (((msg[1] & 0xFF) != META_TEMPO_TYPE) || (msg[2] != 3)) {
return -1;
}
int tempo = (msg[5] & 0xFF) | ((msg[4] & 0xFF) << 8) | ((msg[3] & 0xFF) << 16);
return tempo;
}
/** {@inheritDoc} */
public void send(MidiMessage midi, long time) {
byte[] msg = midi.getMessage();
int len = midi.getLength();
if (len <= 1) {
return;
}
StringBuilder out = new StringBuilder("Status: ");
out.append(msg[0]);
out.append(" Data: [");
for (int i = 1; i < len; i++) {
out.append(msg[i]);
if (i == len - 1) {
out.append("");
} else {
out.append(',');
}
}
out.append(']');
log.debug(out.toString());
}
