Thread: outputing to a text file from sound API

Hi,

I am experimenting with the java sound API.

I came across a nice program that has been made to record a stream of audio in computer memory and which is stored as an array of type byte.

The capture portion of the program captures audio data from the microphone and stores it in a ByteArrayOutputStream object.

I am not familiar however with outputing text files in java.

I was wondering how to go about outputing the captured audio samples are stored in a text file once the playback button is pressed.

The source code of the program is at Java Sound, Getting Started, Part 1, Playback — Developer.com


Basically the code on that website saves the recorded data in memory. I would like to add some simple code that adds the recorded sampled audio data consists of a sequence of bytes to a simple text file.

I would then like to use the outputed data to analyse them in excel.

Thus basically i want to have the software to output the sampled data to a text file, preferebly with a fresh like after each output so that i can load them individually in excel.


Input data from a microphone is captured and saved in a ByteArrayOutputStream object when the user clicks the Capture button.

Data capture stops when the user clicks the Stop button.

Playback begins when the user clicks the Playback button.

The most relevant code is this

 //This method captures audio input // from a microphone and saves it in // a ByteArrayOutputStream object. private void captureAudio(){ try{ //Get everything set up for // capture audioFormat = getAudioFormat(); DataLine.Info dataLineInfo = new DataLine.Info( TargetDataLine.class, audioFormat); targetDataLine = (TargetDataLine) AudioSystem.getLine( dataLineInfo); targetDataLine.open(audioFormat); targetDataLine.start();   //Create a thread to capture the // microphone data and start it // running. It will run until // the Stop button is clicked. Thread captureThread = new Thread( new CaptureThread()); captureThread.start(); } catch (Exception e) { System.out.println(e); System.exit(0); }//end catch }//end captureAudio method

Any help?

Thanks

Hello bondage, welcome to the forums.

This link should help you with writing to a text file: http://www.javaprogrammingforums.com...sing-java.html

Originally Posted by bondage

When you say "Whatever string you want here" in the post below
http://www.javaprogrammingforums.com...sing-java.html

Are you referring to the string i want to output as a text file?

Yes that is the output String.

Originally Posted by bondage

Also, where can i put the code? Is it in a separate class or in the main method as a function?

The thing is that i have a byteArrayOutputStream array and i would like to output it as a text file. Actually what it does is records data, but i will use the output and manupulate it in MATLAB.

I'll take a look at the source on that web page and see what I can come up with.

It looks like the data is stored in the tempBuffer[] array. You can add the file writing code here in the CaptureThread thread:

/*File AudioCapture01.java This program demonstrates the capture and subsequent playback of audio data.   A GUI appears on the screen containing the following buttons: Capture Stop Playback   Input data from a microphone is captured and saved in a ByteArrayOutputStream object when the user clicks the Capture button.   Data capture stops when the user clicks the Stop button.   Playback begins when the user clicks the Playback button.   Tested using SDK 1.4.0 under Win2000 **************************************/   import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import javax.sound.sampled.*;   public class AudioCapture01 extends JFrame {  	boolean stopCapture = false;	ByteArrayOutputStream byteArrayOutputStream;	AudioFormat audioFormat;	TargetDataLine targetDataLine;	AudioInputStream audioInputStream;	SourceDataLine sourceDataLine;  	public static void main(String args[]) {	new AudioCapture01();	}// end main  	public AudioCapture01() {// constructor	final JButton captureBtn = new JButton("Capture");	final JButton stopBtn = new JButton("Stop");	final JButton playBtn = new JButton("Playback");  	captureBtn.setEnabled(true);	stopBtn.setEnabled(false);	playBtn.setEnabled(false);  	// 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 until the Stop	// button is clicked.	captureAudio();	}// end actionPerformed	}// end ActionListener	);// end addActionListener()	getContentPane().add(captureBtn);  	stopBtn.addActionListener(new ActionListener() {	public void actionPerformed(ActionEvent e) {	captureBtn.setEnabled(true);	stopBtn.setEnabled(false);	playBtn.setEnabled(true);	// Terminate the capturing of	// input data from the	// microphone.	stopCapture = true;	}// end actionPerformed	}// end ActionListener	);// end addActionListener()	getContentPane().add(stopBtn);  	playBtn.addActionListener(new ActionListener() {	public void actionPerformed(ActionEvent e) {	// Play back all of the data	// that was saved during	// capture.	playAudio();	}// end actionPerformed	}// end ActionListener	);// end addActionListener()	getContentPane().add(playBtn);  	getContentPane().setLayout(new FlowLayout());	setTitle("Capture/Playback Demo");	setDefaultCloseOperation(EXIT_ON_CLOSE);	setSize(250, 70);	setVisible(true);	}// end constructor  	// This method captures audio input	// from a microphone and saves it in	// a ByteArrayOutputStream object.	private void captureAudio() {	try {	// Get everything set up for	// capture	audioFormat = getAudioFormat();	DataLine.Info dataLineInfo = new DataLine.Info(	TargetDataLine.class, audioFormat);	targetDataLine = (TargetDataLine) AudioSystem.getLine(dataLineInfo);	targetDataLine.open(audioFormat);	targetDataLine.start();  	// Create a thread to capture the	// microphone data and start it	// running. It will run until	// the Stop button is clicked.	Thread captureThread = new Thread(new CaptureThread());	captureThread.start();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end captureAudio method  	// This method plays back the audio	// data that has been saved in the	// ByteArrayOutputStream	private void playAudio() {	try {	// Get everything set up for	// playback.	// Get the previously-saved data	// into a byte array object.	byte audioData[] = byteArrayOutputStream.toByteArray();	// Get an input stream on the	// byte array containing the data	InputStream byteArrayInputStream = new ByteArrayInputStream(	audioData);	AudioFormat audioFormat = getAudioFormat();	audioInputStream = new AudioInputStream(byteArrayInputStream,	audioFormat, audioData.length / audioFormat.getFrameSize());	DataLine.Info dataLineInfo = new DataLine.Info(	SourceDataLine.class, audioFormat);	sourceDataLine = (SourceDataLine) AudioSystem.getLine(dataLineInfo);	sourceDataLine.open(audioFormat);	sourceDataLine.start();  	// Create a thread to play back	// the data and start it	// running. It will run until	// all the data has been played	// back.	Thread playThread = new Thread(new PlayThread());	playThread.start();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end playAudio  	// This method creates and returns an	// AudioFormat object for a given set	// of format parameters. If these	// parameters don't work well for	// you, try some of the other	// allowable parameter values, which	// are shown in comments following	// the declarations.	private AudioFormat getAudioFormat() {	float sampleRate = 8000.0F;	// 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);	}// end getAudioFormat	// ===================================//  	// 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() {	byteArrayOutputStream = new ByteArrayOutputStream();	stopCapture = false;	try {// Loop until stopCapture is set	// by another thread that	// services the Stop button.	while (!stopCapture) {	// Read data from the internal	// buffer of the data line.	int cnt = targetDataLine.read(tempBuffer, 0,	tempBuffer.length);	if (cnt > 0) {	// Save data in output stream	// object.	byteArrayOutputStream.write(tempBuffer, 0, cnt);   [B]	// File writer code here   Writer output = null; File file = new File("C:\\Documents and Settings\\FLASH\\Desktop\\myFile.txt"); output = new BufferedWriter(new FileWriter(file, true)); output.write(tempBuffer[0]); output.close(); System.out.println("Byte written"); [/B]  	}// end if	}// end while	byteArrayOutputStream.close();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end run	}// end inner class CaptureThread	// ===================================//	// Inner class to play back the data	// that was saved.  	class PlayThread extends Thread {	byte tempBuffer[] = new byte[10000];  	public void run() {	try {	int cnt;	// Keep looping until the input	// read method returns -1 for	// empty stream.	while ((cnt = audioInputStream.read(tempBuffer, 0,	tempBuffer.length)) != -1) {	if (cnt > 0) {	// Write data to the internal	// buffer of the data line	// where it will be delivered	// to the speaker.	sourceDataLine.write(tempBuffer, 0, cnt);	}// end if	}// end while	// Block and wait for internal	// buffer of the data line to	// empty.	sourceDataLine.drain();	sourceDataLine.close();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end run	}// end inner class PlayThread	// ===================================//   }// end outer class AudioCapture01.java

We are testing this here by writing tempBuffer[0] to the file.

We need to implement a counter or something so we write each part of the array

We could try:

/*File AudioCapture01.java This program demonstrates the capture and subsequent playback of audio data.   A GUI appears on the screen containing the following buttons: Capture Stop Playback   Input data from a microphone is captured and saved in a ByteArrayOutputStream object when the user clicks the Capture button.   Data capture stops when the user clicks the Stop button.   Playback begins when the user clicks the Playback button.   Tested using SDK 1.4.0 under Win2000 **************************************/   import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import javax.sound.sampled.*;   public class AudioCapture01 extends JFrame {  	[B]public int counter;[/B]  	boolean stopCapture = false;	ByteArrayOutputStream byteArrayOutputStream;	AudioFormat audioFormat;	TargetDataLine targetDataLine;	AudioInputStream audioInputStream;	SourceDataLine sourceDataLine;  	public static void main(String args[]) {	new AudioCapture01();	}// end main  	public AudioCapture01() {// constructor	final JButton captureBtn = new JButton("Capture");	final JButton stopBtn = new JButton("Stop");	final JButton playBtn = new JButton("Playback");  	captureBtn.setEnabled(true);	stopBtn.setEnabled(false);	playBtn.setEnabled(false);  	// 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 until the Stop	// button is clicked.	captureAudio();	}// end actionPerformed	}// end ActionListener	);// end addActionListener()	getContentPane().add(captureBtn);  	stopBtn.addActionListener(new ActionListener() {	public void actionPerformed(ActionEvent e) {	captureBtn.setEnabled(true);	stopBtn.setEnabled(false);	playBtn.setEnabled(true);	// Terminate the capturing of	// input data from the	// microphone.	stopCapture = true;	}// end actionPerformed	}// end ActionListener	);// end addActionListener()	getContentPane().add(stopBtn);  	playBtn.addActionListener(new ActionListener() {	public void actionPerformed(ActionEvent e) {	// Play back all of the data	// that was saved during	// capture.	playAudio();	}// end actionPerformed	}// end ActionListener	);// end addActionListener()	getContentPane().add(playBtn);  	getContentPane().setLayout(new FlowLayout());	setTitle("Capture/Playback Demo");	setDefaultCloseOperation(EXIT_ON_CLOSE);	setSize(250, 70);	setVisible(true);	}// end constructor  	// This method captures audio input	// from a microphone and saves it in	// a ByteArrayOutputStream object.	private void captureAudio() {	try {	// Get everything set up for	// capture	audioFormat = getAudioFormat();	DataLine.Info dataLineInfo = new DataLine.Info(	TargetDataLine.class, audioFormat);	targetDataLine = (TargetDataLine) AudioSystem.getLine(dataLineInfo);	targetDataLine.open(audioFormat);	targetDataLine.start();  	// Create a thread to capture the	// microphone data and start it	// running. It will run until	// the Stop button is clicked.	Thread captureThread = new Thread(new CaptureThread());	captureThread.start();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end captureAudio method  	// This method plays back the audio	// data that has been saved in the	// ByteArrayOutputStream	private void playAudio() {	try {	// Get everything set up for	// playback.	// Get the previously-saved data	// into a byte array object.	byte audioData[] = byteArrayOutputStream.toByteArray();	// Get an input stream on the	// byte array containing the data	InputStream byteArrayInputStream = new ByteArrayInputStream(	audioData);	AudioFormat audioFormat = getAudioFormat();	audioInputStream = new AudioInputStream(byteArrayInputStream,	audioFormat, audioData.length / audioFormat.getFrameSize());	DataLine.Info dataLineInfo = new DataLine.Info(	SourceDataLine.class, audioFormat);	sourceDataLine = (SourceDataLine) AudioSystem.getLine(dataLineInfo);	sourceDataLine.open(audioFormat);	sourceDataLine.start();  	// Create a thread to play back	// the data and start it	// running. It will run until	// all the data has been played	// back.	Thread playThread = new Thread(new PlayThread());	playThread.start();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end playAudio  	// This method creates and returns an	// AudioFormat object for a given set	// of format parameters. If these	// parameters don't work well for	// you, try some of the other	// allowable parameter values, which	// are shown in comments following	// the declarations.	private AudioFormat getAudioFormat() {	float sampleRate = 8000.0F;	// 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);	}// end getAudioFormat	// ===================================//  	// 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() {	byteArrayOutputStream = new ByteArrayOutputStream();	stopCapture = false;	try {// Loop until stopCapture is set	// by another thread that	// services the Stop button.	while (!stopCapture) {	// Read data from the internal	// buffer of the data line.	int cnt = targetDataLine.read(tempBuffer, 0,	tempBuffer.length);	if (cnt > 0) {	// Save data in output stream	// object.	byteArrayOutputStream.write(tempBuffer, 0, cnt);    	// File writer code here   Writer output = null; File file = new File("C:\\Documents and Settings\\FLASH\\Desktop\\myFile.txt"); output = new BufferedWriter(new FileWriter(file, true)); output.write(tempBuffer[[B]counter[/B]]); output.close(); System.out.println("Byte written"); [B]counter++;[/B]    	}// end if	}// end while	byteArrayOutputStream.close();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end run	}// end inner class CaptureThread	// ===================================//	// Inner class to play back the data	// that was saved.  	class PlayThread extends Thread {	byte tempBuffer[] = new byte[10000];  	public void run() {	try {	int cnt;	// Keep looping until the input	// read method returns -1 for	// empty stream.	while ((cnt = audioInputStream.read(tempBuffer, 0,	tempBuffer.length)) != -1) {	if (cnt > 0) {	// Write data to the internal	// buffer of the data line	// where it will be delivered	// to the speaker.	sourceDataLine.write(tempBuffer, 0, cnt);	}// end if	}// end while	// Block and wait for internal	// buffer of the data line to	// empty.	sourceDataLine.drain();	sourceDataLine.close();	} catch (Exception e) {	System.out.println(e);	System.exit(0);	}// end catch	}// end run	}// end inner class PlayThread	// ===================================//   }// end outer class AudioCapture01.java

I don't have a microphone to test it properly though. Tell me if it works!

The code I provided is copying the contents of the array to the text file at the same time as recording.

I don't have a microphone so I will never be able to tell if the output is correct. I suggest printing the contents of the array to the console..

Maybe try adding this 1 line of code under the comment.

// File writer code here System.out.println(tempBuffer[counter]);