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Added pitch-bending capabilities.

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Sam Archer 2012-03-08 23:27:04 -08:00
parent 942f0b1656
commit 3e9bf6a078
1 changed files with 45 additions and 23 deletions
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68
Java/MoppyDesk/src/moppydesk/MoppyPlayer.java
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@ -3,6 +3,7 @@ package moppydesk;
import gnu.io.SerialPort; import gnu.io.SerialPort;
import javax.sound.midi.MidiMessage; import javax.sound.midi.MidiMessage;
import javax.sound.midi.Receiver; import javax.sound.midi.Receiver;
/** /**
* *
* @author Sammy1Am * @author Sammy1Am
@ -17,15 +18,15 @@ public class MoppyPlayer implements Receiver {
* precise enough for musical notes. * precise enough for musical notes.
*/ */
public static int[] microPeriods = { public static int[] microPeriods = {
0,0,0,0,0,0,0,0,0,0,0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0,0,0,0,0,0,0,0,0,0,0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
30578,28861,27242,25713,24270,20409,21622,20409,19263,18182,17161,16198, //C1 - B1 30578, 28861, 27242, 25713, 24270, 20409, 21622, 20409, 19263, 18182, 17161, 16198, //C1 - B1
15289,14436,13621,12856,12135,11454,10811,10205,9632,9091,8581,8099, //C2 - B2 15289, 14436, 13621, 12856, 12135, 11454, 10811, 10205, 9632, 9091, 8581, 8099, //C2 - B2
7645,7218,6811,6428,6068,5727,5406,5103,4816,4546,4291,4050, //C3 - B3 7645, 7218, 6811, 6428, 6068, 5727, 5406, 5103, 4816, 4546, 4291, 4050, //C3 - B3
3823,3609,3406,3214,3034,2864,2703,2552,2408,2273,2146,2025, //C4 - B4 3823, 3609, 3406, 3214, 3034, 2864, 2703, 2552, 2408, 2273, 2146, 2025, //C4 - B4
0,0,0,0,0,0,0,0,0,0,0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0,0,0,0,0,0,0,0,0,0,0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0,0,0,0,0,0,0,0,0,0,0,0 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
}; };
/** /**
@ -33,7 +34,12 @@ public class MoppyPlayer implements Receiver {
*/ */
public static int ARDUINO_RESOLUTION = 40; public static int ARDUINO_RESOLUTION = 40;
/**
* Current period of each MIDI channel (zero is off) as set
* by the NOTE ON message; for pitch-bending.
*/
private int[] currentPeriod = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
MoppyBridge mb; MoppyBridge mb;
SerialPort com; SerialPort com;
@ -41,44 +47,60 @@ public class MoppyPlayer implements Receiver {
mb = newMb; mb = newMb;
} }
public void close(){ public void close() {
mb.close(); mb.close();
} }
//Is called by Java MIDI libraries for each MIDI message encountered. //Is called by Java MIDI libraries for each MIDI message encountered.
public void send(MidiMessage message, long timeStamp) { public void send(MidiMessage message, long timeStamp) {
if (message.getStatus() > 127 && message.getStatus() < 144){ // Note OFF if (message.getStatus() > 127 && message.getStatus() < 144) { // Note OFF
//Convert the MIDI channel being used to the controller pin on the //Convert the MIDI channel being used to the controller pin on the
//Arduino by multipying by 2. //Arduino by multipying by 2.
byte pin = (byte)(2*(message.getStatus() - 127)); byte pin = (byte) (2 * (message.getStatus() - 127));
//System.out.println("Got note OFF on pin: " + (pin & 0xFF)); //System.out.println("Got note OFF on pin: " + (pin & 0xFF));
mb.sendEvent(pin, 0); mb.sendEvent(pin, 0);
} currentPeriod[message.getStatus() - 128] = 0;
else if (message.getStatus() > 143 && message.getStatus() < 160){ // Note ON } else if (message.getStatus() > 143 && message.getStatus() < 160) { // Note ON
//Convert the MIDI channel being used to the controller pin on the //Convert the MIDI channel being used to the controller pin on the
//Arduino by multipying by 2. //Arduino by multipying by 2.
byte pin = (byte)(2*(message.getStatus() - 143)); byte pin = (byte) (2 * (message.getStatus() - 143));
//Get note number from MIDI message, and look up the period. //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 //NOTE: Java bytes range from -128 to 127, but we need to make them
//0-255 to use for lookups. & 0xFF does the trick. //0-255 to use for lookups. & 0xFF does the trick.
// After looking up the period, devide by (the Arduino resolution * 2). // 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 // 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 // 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. // on-off cycle (one step on the floppy) is two periods.
int period = microPeriods[(message.getMessage()[1] & 0xff)]/(ARDUINO_RESOLUTION*2); 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("Got note ON on pin: " + (pin & 0xFF) + " with period " + period);
//System.out.println(message.getLength() + " " + message.getMessage()[message.getLength()-1]); //System.out.println(message.getLength() + " " + message.getMessage()[message.getLength()-1]);
//Zero velocity events turn off the pin. //Zero velocity events turn off the pin.
if (message.getMessage()[2] == 0){ if (message.getMessage()[2] == 0) {
mb.sendEvent(pin, 0); mb.sendEvent(pin, 0);
currentPeriod[message.getStatus() - 144] = 0;
} else { } else {
mb.sendEvent(pin, period); 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) / 49152));
//System.out.println(currentPeriod[message.getStatus() - 224] + "-" + period);
mb.sendEvent(pin, period);
} }
} }
} }
} }