Question

Reading data from microphone

Asked by: jdav3579

Hi,
I simply want to read from the microphone input as bytes into an array.
Can anyone provide sample code or links to how to do this. I would prefer a simple complete example rather than bits of code as I seem to get off other sites. Surely its just a simple case of reading in the byte stream like the byte stream of anything else like a file for example?

Thanks in advance.
Regards
John

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Asked On
2007-09-04 at 10:10:36ID22805833
Tags

microphone

,

from

,

data

,

read

Topic

New to Java Programming

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Answers

 

by: marklorenzPosted on 2007-09-04 at 11:06:47ID: 19827091

Perhaps this is what you're looking for:

Java Sound, Capturing Microphone Data into an Audio File
http://www.developer.com/java/other/article.php/2105421

Capturing Audio
http://java.sun.com/docs/books/tutorial/sound/capturing.html

 

by: objectsPosted on 2007-09-04 at 15:41:20ID: 19829006

 

by: jdav3579Posted on 2007-09-05 at 12:44:20ID: 19835191

Thanks for your comments, I have tried to understand from the code links you have posted what is going on. I have tried to extract what I think is the very basic of what goes on, I literally want to get data from the microphone and display its byte values on the screen. This is the code I have done so far, but it wont work (null pointer exception).

public class Microphone
{
      private static TargetDataLine m_line;


    public static void main(String[] args)
          {
       //open line
             m_line.start();      
             byte[] data = new byte [10000];
        //read in the data from the microphone
             m_line.read(data,0,10000);
        //display the bytes
             for(int i=0; i<10000; i++){
                   System.out.println(data[i]);
             }
             
          }
}


Thanks for your help so far.
Regards
John

 

by: objectsPosted on 2007-09-05 at 16:37:43ID: 19836600

u need to create your data line

 

by: marklorenzPosted on 2007-09-11 at 11:25:10ID: 19870941

You're missing some details.  Try following this code (complete code can be found at the URL):

//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

http://www.developer.com/java/other/print.php/1565671

20120131-EE-VQP-002

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