Javaに「ド」を再生させる

PCMを使って音程を再生させる。ちゃんとクラスを考える時間がなかったので、とりあえず実行する箇所をmainメソッドにまとめたものを貼ってメモる。

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
public class HelloPCM {
public static void main(String[] args) throws LineUnavailableException {
float sampleRate = 11025f;
int sampleSizeInBits = 8;
int channels = 1;
int frameSize = 1;
float frameRate = 11025f;
boolean bigEndian = true;
AudioFormat format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
sampleRate, sampleSizeInBits,channels,frameSize, frameRate, bigEndian);
SourceDataLine line = null;
try {
line = (SourceDataLine) AudioSystem.getLine(
new DataLine.Info(SourceDataLine.class, format));
line.open();
line.start();
float key = 260.7f; // C
byte[] buffer = new byte[(int)sampleRate];
int rate = (int) (sampleRate / key);
int volume = 50;
boolean isUp = true;
for (int i = 0; i < buffer.length; i++) {
if (i % rate == 0) {
isUp = isUp ? false : true;
}
buffer[i] = isUp
? (byte) volume
: (byte) (volume * -1);
}
line.write(buffer, 0, buffer.length);
} finally {
if (line != null) {
line.close();
}
}
}
}