Charles Bell
Posts: 519
Nickname: charles
Registered: Feb, 2002
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Re: please help
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Posted: May 18, 2002 3:49 PM
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On my machine, I am not getting "no capture found" messages.
If you are trying to record something from your microphone, you might try this little demo code:
/* RecordAndPlay.java
* @author: jbell
* @version: Mar 28, 2001
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.sound.sampled.*;
public class RecordAndPlay implements ActionListener, Runnable {
Thread thread;
AudioInputStream ais;
boolean recordstatus = false;
boolean playstatus = false;
float samplerate = 11025.0f;
float framerate = 11025.0f;
int buffersize = 16384;
public static void main(String[] args){
RecordAndPlay recordandplay = new RecordAndPlay();
recordandplay.init();
}
public void init(){
JFrame frame = new JFrame("RecordAndPlay");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton recordbutton = new JButton("Record");
JButton stopbutton = new JButton("Stop");
JButton playbutton = new JButton("Play");
JButton savebutton = new JButton("Save");
JButton exitbutton = new JButton("Exit");
recordbutton.addActionListener(this);
stopbutton.addActionListener(this);
playbutton.addActionListener(this);
savebutton.addActionListener(this);
exitbutton.addActionListener(this);
JPanel panel = new JPanel();
panel.add(recordbutton);
panel.add(stopbutton);
panel.add(playbutton);
panel.add(savebutton);
panel.add(exitbutton);
frame.getContentPane().add(panel,"Center");
frame.show();
frame.pack();
}
public void actionPerformed(ActionEvent actionevent){
String command = actionevent.getActionCommand();
System.out.println(command);
if (command.compareTo("Record")==0){
recordstatus = true;
playstatus = false;
start();
} else if (command.compareTo("Stop")==0){
stop();
} else if (command.compareTo("Play")==0){
recordstatus = false;
playstatus = true;
start();
}else if (command.compareTo("Save")==0){
saveToFile();
}else if (command.compareTo("Exit")==0){
if (thread != null) stop();
System.exit(0);
}
}
public void start() {
thread = new Thread(this);
thread.start();
}
public void stop() {
recordstatus = false;
playstatus = false;
thread = null;
}
public void run(){
if ((recordstatus)&&(!playstatus)) record();
if ((playstatus)&& (!recordstatus)) playback();
}
public void playback(){
SourceDataLine line;
if (ais == null) {
System.out.println("You need to record something first");
playstatus = false;
return;
}
// reset to the beginnning of the stream
try {
ais.reset();
} catch (Exception e) {
System.out.println("Unable to reset the stream\n" + e);
return;
}
// get an AudioInputStream of the desired audioformat for playback
AudioFormat audioformat = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
samplerate, 8, 1, 1, framerate,false);
AudioInputStream playbackstream = AudioSystem.getAudioInputStream(audioformat, ais);
if (playbackstream == null) {
System.out.println("Unable to convert stream of audioformat " + ais + " to audioformat " + audioformat);
return;
}
// define the required attributes for our line,
// and make sure a compatible line is supported.
DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioformat);
if (!AudioSystem.isLineSupported(info)) {
System.out.println("Line matching " + info + " not supported.");
return;
}
// get and open the source data line for playback.
try{
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(audioformat, buffersize);
}catch (LineUnavailableException lue) {
System.out.println("Unable to open the line to the microphone input.");
System.out.println("LineUnavailableException: " + lue.getMessage());
return;
}
// play back the captured audio data
int frameSizeInBytes = audioformat.getFrameSize();
int bufferLengthInFrames = line.getBufferSize() / 8;
int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
byte[] data = new byte[bufferLengthInBytes];
int bytenumber = 0;
// start the source data line
line.start();
while (thread != null) {
try {
if ((bytenumber = playbackstream.read(data)) == -1) {
break;
}
int numBytesRemaining = bytenumber;
while (numBytesRemaining > 0) {
numBytesRemaining -= line.write(data, 0, numBytesRemaining);
}
} catch (Exception e) {
System.out.println("Error during playback: " + e);
System.out.println("Exception: " + e.getMessage());
break;
}
}
if (thread != null) {
line.drain();
}
line.stop();
line.close();
line = null;
}
public void record() {
TargetDataLine line = null;
// define the required attributes for our line,
// and make sure a compatible line is supported.
AudioFormat audioformat = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
samplerate, 8, 1, 1, framerate,false);
DataLine.Info info = new DataLine.Info(TargetDataLine.class,audioformat);
if (!AudioSystem.isLineSupported(info)) {
System.out.println("Line matching " + info + " not supported.");
System.exit(0);
}
// get and open the target data line for capture.
try{
line = (TargetDataLine) AudioSystem.getLine(info);
line.open(audioformat, line.getBufferSize());
}catch (LineUnavailableException lune) {
System.err.println("Unable to open the line: " + lune.getMessage());
System.exit(0);
}catch (SecurityException se) {
System.err.println("SecurityException: " + se.toString());
System.exit(0);
}catch(Exception ex) {
System.err.println("Exception: " + ex.getMessage());
System.exit(0);
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int frameSizeInBytes = audioformat.getFrameSize();
int bufferLengthInFrames = line.getBufferSize() / 8;
int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
byte[] data = new byte[bufferLengthInBytes];
int bytenumber = 0;
line.start();
System.out.println("Started Recording");
while (thread != null) {
if((bytenumber = line.read(data, 0, bufferLengthInBytes)) == -1) {
break;
}
baos.write(data, 0, bytenumber);
}
System.out.println("Stopped Recording");
//stop and close the line
line.stop();
line.close();
line = null;
// stop and close the output stream
try{
baos.flush();
baos.close();
}catch (IOException ioe) {
System.err.println(ioe.getMessage());
}
// load bytes into the audio input stream for playback
byte audioBytes[] = baos.toByteArray();
ByteArrayInputStream bais = new ByteArrayInputStream(audioBytes);
ais = new AudioInputStream(bais, audioformat, audioBytes.length / frameSizeInBytes);
try{
ais.reset();
}catch (Exception e) {
System.err.println("Exception: " + e.getMessage());
return;
}
}
public void saveToFile() {
AudioFileFormat.Type audiofileformattype = AudioFileFormat.Type.WAVE;
if (ais == null) {
System.out.println("No recorded audio to save");
return;
}
// reset to the beginnning of the recorded data
try{
ais.reset();
}catch (Exception e) {
System.err.println("Unable to reset stream " + e);
return;
}
File file = getFileToSave();
try {
if (AudioSystem.write(ais, audiofileformattype, file) == -1) {
throw new IOException("Problems writing to file");
}
}catch (IOException ioe) {
System.err.println("IOException: " + ioe.getMessage());
}catch (Exception e) {
System.err.println("Exception: " + e.getMessage());
}
}
/** Uses the showSaveDialog method of JFileChooser to request the user to
* select the file to save to
*/
public File getFileToSave(){
File file = null;
JFrame jframe = new JFrame();
JFileChooser chooser = new JFileChooser(".");
int returnvalue = chooser.showSaveDialog(jframe);
if(returnvalue == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
}
return file;
}
}
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