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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
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* this list of conditions and the following disclaimer.
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package org.scijava.util;
import java.util.Arrays;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
/**
* Any QBasic fans out there? ;-)
*
* @author Curtis Rueden
*/
public class TunePlayer {
private final int sampleRate;
private byte[] buf = new byte[0];
private int noteLength = 1;
private int tempo = 60;
private int octave = 4;
public TunePlayer() {
this(16 * 1000); // 16KHz
}
public TunePlayer(final int sampleRate) {
this.sampleRate = sampleRate;
}
// -- TunePlayer methods --
public int getSampleRate() {
return sampleRate;
}
public int getNoteLength() {
return noteLength;
}
public int getTempo() {
return tempo;
}
public int getOctave() {
return octave;
}
/** Gets the value of the given tone for the current octave. */
public int getTone(final int step, final char mod) {
int tone = 12 * (getOctave() - 4) + step;
if (mod == '#' || mod == '+') tone++;
if (mod == '-') tone--;
return tone;
}
/** Gets the current note length in milliseconds, by the current tempo. */
public int getMillis() {
return toMillis(getNoteLength());
}
/** Converts the given note length to milliseconds, by the current tempo. */
public int toMillis(final int noteLen) {
// one "beat" is one quarter note; hence:
// noteLen of 1 = 4 beats per note
// noteLen of 4 = 1 beat per note
// noteLen of 8 = 1/2 beat per note
// generally: beatsPerNote = 4 / noteLen
// tempo of 60 = 1 second per beat = 1000 ms per beat
// tempo of 120 = 1/2 second per beat = 500 ms per beat
// generally: msPerBeat = 6000 / tempo
// msPerNote = beatsPerNote * msPerBeat = 4 / noteLen * 6000 / tempo
// TODO - Determine why timing is off by a factor of 10.
return 10 * 24000 / (noteLen * getTempo());
}
public void setNoteLength(final int noteLength) {
this.noteLength = noteLength;
}
public void setTempo(final int tempo) {
this.tempo = tempo;
}
public void setOctave(final int octave) {
this.octave = octave;
}
public void downOctave() {
octave--;
}
public void upOctave() {
octave++;
}
public SourceDataLine openLine() throws LineUnavailableException {
final AudioFormat af = new AudioFormat(sampleRate, 8, 1, true, true);
final SourceDataLine line = AudioSystem.getSourceDataLine(af);
line.open(af, sampleRate);
line.start();
return line;
}
public void closeLine(final SourceDataLine line) {
line.drain();
line.close();
}
public boolean play(final String commandString) {
final SourceDataLine line;
try {
line = openLine();
}
catch (final LineUnavailableException e) {
return false;
}
final String[] tokens = commandString.toUpperCase().split(" ");
for (final String token : tokens) {
final char command = token.charAt(0);
final String arg = token.substring(1);
final char mod = token.length() > 1 ? token.charAt(1) : '\0';
switch (command) {
case '<': // down one octave
downOctave();
break;
case '>': // up one octave
upOctave();
break;
case 'A':
play(line, getTone(9, mod));
break;
case 'B':
play(line, getTone(11, mod));
break;
case 'C':
play(line, getTone(0, mod));
break;
case 'D':
play(line, getTone(2, mod));
break;
case 'E':
play(line, getTone(4, mod));
break;
case 'F':
play(line, getTone(5, mod));
break;
case 'G':
play(line, getTone(7, mod));
break;
case 'L': // change note length
setNoteLength(Integer.parseInt(arg));
break;
case 'M': // change music mode
// TODO
break;
case 'N': // note
final int note = Integer.parseInt(arg);
if (note == 0) play(line, null);
else play(line, note - 48);
break;
case 'O': // change octave
setOctave(Integer.parseInt(arg));
break;
case 'P': // pause
int len;
try {
len = Integer.parseInt(arg);
}
catch (final NumberFormatException exc) {
len = noteLength;
}
play(line, null, toMillis(len));
break;
case 'T': // change tempo
setTempo(Integer.parseInt(arg));
break;
default:
throw new RuntimeException("Unknown command: " + command);
}
}
closeLine(line);
return true;
}
// -- Helper methods --
private void play(final SourceDataLine line, final Integer tone) {
play(line, tone, getMillis());
}
private void
play(final SourceDataLine line, final Integer tone, final int ms)
{
final int length = fill(tone, ms);
int count = 0;
while (count < length) {
final int r = line.write(buf, count, length - count);
if (r <= 0) throw new RuntimeException("Could not write to line");
count += r;
}
}
/**
* @param tone Use 1 for A4, +1 for half-step up, -1 for half-step down.
* @param ms Milliseconds of data to fill.
* @return Length of buffer filled, in bytes.
*/
private int fill(final Integer tone, final int ms) {
final int length = sampleRate * ms / 1000;
if (length > buf.length) {
// ensure internal buffer is large enough
buf = new byte[length];
}
if (tone == null) {
// rest data
Arrays.fill(buf, 0, length, (byte) 0);
}
else {
// tone data
final double exp = ((double) tone - 1) / 12d;
final double f = 440d * Math.pow(2d, exp);
for (int i = 0; i < length; i++) {
final double period = sampleRate / f;
final double angle = 2 * Math.PI * i / period;
buf[i] = (byte) (127 * Math.sin(angle));
}
}
return length;
}
}