.wav ファイルを記録および再生する小さなプログラムがあります。GUIクラスには、「停止」ボタン用の次のコードがあります。
private AudioCapture audCap = new AudioCapture();
stopBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
audCap.stopCapture = true; // this doesn't work
audCap.stopPlayback = true; // this does
}
}
AudioCapture() クラスには、再生用の次のコードがあり、停止ボタンをクリックすると正しく停止します。
class PlayThread extends Thread {
byte tempBuffer[] = new byte[10000];
public void run() {
stopPlayback = false;
try {
sourceDataLine.open(audioFormat);
sourceDataLine.start();
int cnt;
while ((cnt = audioInputStream.read(tempBuffer, 0,
tempBuffer.length)) != -1 && stopPlayback == false) {
if (cnt > 0) {
sourceDataLine.write(tempBuffer, 0, cnt);
}
}
sourceDataLine.drain();
sourceDataLine.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
}
}
停止ボタンをクリックしても停止しない、記録/キャプチャ用の次のコードもあります。
class CaptureThread extends Thread {
// An arbitrary-size temporary holding buffer
byte tempBuffer[] = new byte[10000];
public void run() {
stopCapture = false;
// record as wave
AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
// takes user input file name and appends filetype
audioFile = new File(wavName + ".wav");
try {
while (!stopCapture) {
int cnt = targetDataLine.read(tempBuffer, 0,
tempBuffer.length);
if (cnt > 0) {
AudioSystem.write(new AudioInputStream(targetDataLine),
fileType, audioFile);
}
}
targetDataLine.stop();
targetDataLine.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
stopCature と stopPlayback は、AudioCapture() クラスのインスタンス変数です。
私はEclipseを使用していて、「while (!stopCapture)」にブレークポイントを設定しようとしましたが、これを超えることはないようです。上記のコードに、最初のメソッドが期待どおりに機能するが、2番目のメソッドが機能しない原因があるかどうかは誰にもわかりませんか?
-編集-プログラムの縮小バージョンをSSCEに入れようとしましたが、それでも数百行まで実行されます。
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.TargetDataLine;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class audioTest extends JFrame {
private static final long serialVersionUID = 1L;
AudioCapture audCap = new AudioCapture();
public static void main(String[] args) {
new audioTest();
}
public audioTest() {
layoutTransporButtons();
getContentPane().setLayout(new FlowLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(350, 100);
setVisible(true);
}
public void layoutTransporButtons() {
final JPanel guiButtonPanel = new JPanel();
final JButton captureBtn = new JButton("Record");
final JButton stopBtn = new JButton("Stop");
final JButton playBtn = new JButton("Playback");
guiButtonPanel.setLayout(new GridLayout());
this.add(guiButtonPanel);
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
// Register anonymous listeners
captureBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
captureBtn.setEnabled(false);
stopBtn.setEnabled(true);
playBtn.setEnabled(false);
// Capture input data from the microphone
audCap.captureAudio();
}
});
guiButtonPanel.add(captureBtn);
stopBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
audCap.stopRecordAndPlayback = true;
}
});
guiButtonPanel.add(stopBtn);
playBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
stopBtn.setEnabled(true);
audCap.playAudio();
}
});
guiButtonPanel.add(playBtn);
}
class AudioCapture {
volatile boolean stopRecordAndPlayback = false;
AudioFormat audioFormat;
TargetDataLine targetDataLine;
AudioInputStream audioInputStream;
SourceDataLine sourceDataLine;
private String wavName;
private File audioFile;
/**
* capture audio input from microphone and save as .wav file
*/
public void captureAudio() {
wavName = JOptionPane.showInputDialog(null,
"enter name of file to be recorded:");
try {
Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
// Select an available mixer
Mixer mixer = AudioSystem.getMixer(mixerInfo[1]);
// Get everything set up for capture
audioFormat = getAudioFormat();
DataLine.Info dataLineInfo = new DataLine.Info(
TargetDataLine.class, audioFormat);
// Get a TargetDataLine on the selected mixer.
targetDataLine = (TargetDataLine) mixer.getLine(dataLineInfo);
// Prepare the line for use.
targetDataLine.open(audioFormat);
targetDataLine.start();
// Create a thread to capture the microphone
Thread captureThread = new CaptureThread();
captureThread.start();
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}
}
/**
* This method plays back the audio data that has
* been chosen by the user
*/
public void playAudio() {
// add file chooser
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(audioFile);
int returnVal = chooser.showOpenDialog(chooser);
// retrieve chosen file
if (returnVal == JFileChooser.APPROVE_OPTION) {
// create the file
audioFile = chooser.getSelectedFile();
}
// play chosen file
try {
audioInputStream = AudioSystem.getAudioInputStream(audioFile);
audioFormat = audioInputStream.getFormat();
DataLine.Info dataLineInfo = new DataLine.Info(
SourceDataLine.class, audioFormat);
sourceDataLine = (SourceDataLine) AudioSystem
.getLine(dataLineInfo);
// Create a thread to play back the data
new PlayThread().start();
} catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
}
/**
* This method creates and returns an AudioFormat object
*/
private AudioFormat getAudioFormat() {
float sampleRate = 44100.0F;
// 8000,11025,16000,22050,44100
int sampleSizeInBits = 16;
// 8,16
int channels = 1;
// 1,2
boolean signed = true;
// true,false
boolean bigEndian = false;
// true,false
return new AudioFormat(sampleRate, sampleSizeInBits, channels,
signed, bigEndian);
}
/**
* Inner class to capture data from microphone
*/
class CaptureThread extends Thread {
// An arbitrary-size temporary holding buffer
byte tempBuffer[] = new byte[10000];
public void run() {
// reset stopCapture to false
stopRecordAndPlayback = false;
// record as wave
AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
// take user input file name and append file type
audioFile = new File(wavName + ".wav");
try {
targetDataLine.open(audioFormat);
targetDataLine.start();
while (!stopRecordAndPlayback) {
AudioSystem.write(new AudioInputStream(targetDataLine),
fileType, audioFile);
}
targetDataLine.stop();
targetDataLine.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* Inner class to play back the data
*/
class PlayThread extends Thread {
byte tempBuffer[] = new byte[10000];
public void run() {
// reset stop button
stopRecordAndPlayback = false;
try {
sourceDataLine.open(audioFormat);
sourceDataLine.start();
int cnt;
while ((cnt = audioInputStream.read(tempBuffer, 0,
tempBuffer.length)) != -1
&& stopRecordAndPlayback == false) {
if (cnt > 0) {
sourceDataLine.write(tempBuffer, 0, cnt);
}
}
sourceDataLine.drain();
sourceDataLine.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
}
}
}
}