How to record sound with Java Sound?

Question

I just want to record a clip of sound and save it to a WAV file. I exhausted the web but didn't find a tutorial. Would someone be kind enough to give me a tutorial or a sample code? The simpler the better. Thanks.

Answer 1

Here's the code I used to record and play sound. Hope the length do not confound you.
import javax.sound.sampled.*;
import java.io.*;
// The audio format you want to record/play
AudioFormat.Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;
int sampleRate = 44100;
byte sampleSizeInBits = 16;
int channels = 2;
int frameSize = 4;
int frameRate = 44100;
boolean bigEndian = false;
int bytesPerSecond = frameSize * frameRate;
AudioFormat format = new AudioFormat(encoding, sampleRate, sampleSizeInBits, channels, frameSize, frameRate, bigEndian);
//TO RECORD:
//Get the line for recording
try {
  targetLine = AudioSystem.getTargetDataLine(format);
catch (LineUnavailableException e) {
  showMessage("Unable to get a recording line");
// The formula might be a bit hard :)
float timeQuantum = 0.1F;
int bufferQuantum = frameSize * (int)(frameRate * timeQuantum);
float maxTime = 10F;
int maxQuantums = (int)(maxTime / timeQuantum);
int bufferCapacity = bufferQuantum * maxQuantums;
byte[] buffer = new byte[bufferCapacity]; // the array to hold the recorded sound
int bufferLength = 0;
//The following has to repeated every time you record a new piece of sound
targetLine.open(format);
targetLine.start();
AudioInputStream in = new AudioInputStream(targetLine);
bufferLength = 0;
for (int i = 0; i < maxQuantums; i++) { //record up to bufferQuantum * maxQuantums bytes
  int len = in.read(buffer, bufferQuantum * i, bufferQuantum);
  if (len < bufferQuantum) break; // the recording may be interrupted
  bufferLength += len;
targetLine.stop();
targetLine.close();
//Save the recorded sound into a file
AudioInputStream stream = AudioSystem.getAudioInputStream(new ByteArrayInputStream(buffer, 0, bufferLength));
AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
File file = new File(...); // your file name
AudioSystem.write(stream, fileType, file);
//TO PLAY:
//Get the line for playing
try {
  sourceLine = AudioSystem.getSourceDataLine(format);
catch (LineUnavailableException e) {
  showMessage("Unable to get a playback line");
//The following has to repeated every time you play a new piece of sound
sourceLine.open(format);
sourceLine.start();
int quantums = bufferLength / bufferQuantum;
for (int i = 0; i < quantums; i++) {
  sourceLine.write(buffer, bufferQuantum * i, bufferQuantum);
sourceLine.drain(); //Drain the line to make sure all the sound you feed it is played
sourceLine.stop();
sourceLine.close();
//Or, if you want to play a file:
File audioFile = new File(...);//
AudioInputStream in = AudioSystem.getAudioInputStream(audioFile);
sourceDataLine.open(format);
sourceDataLine.start();
while(true) {
  if(in.read(buffer,0,bufferQuantum) == -1) break; // read a bit of sound from the file
  sourceDataLine.write(buffer,0,buffer.length); // and play it
sourceDataLine.drain();
sourceDataLine.stop();
sourceDataLine.close();You may also do this to record sound directly into a file:
targetLine.open(format);
targetLine.start();
AudioInputStream in = new AudioInputStream(targetLine);
AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
File file = new File(...); // your file name
new Thread() {public void run() {AudioSystem.write(stream, fileType, file);}}.start(); //Run this in a separate thread
//When you want to stop recording, run the following: (usually triggered by a button or sth)
targetLine.stop();
targetLine.close();Edited by: Maigo on Jun 26, 2008 7:44 AM