Java Tutorial/J2ME/Audio Capture

Capture Playback Audio

   <source lang="java">

import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.media.Manager; import javax.microedition.media.Player; import javax.microedition.media.control.RecordControl; import javax.microedition.midlet.MIDlet; public class CapturePlaybackAudioMIDlet extends MIDlet implements CommandListener {

 private Display display = null;
 private Alert alert = new Alert("Message");
 private Command exitCommand = new Command("Exit", Command.EXIT, 1);
 private Player capturePlayer = null;
 private Player playbackPlayer = null;
 private RecordControl recordControl = null;
 private ByteArrayOutputStream bos = new ByteArrayOutputStream();
 private ByteArrayInputStream bis = null;
 public CapturePlaybackAudioMIDlet() {
   display = Display.getDisplay(this);
   alert.setTimeout(Alert.FOREVER);
   alert.setString("Capturing for 10 seconds.");
   alert.addCommand(exitCommand);
   alert.setCommandListener(this);
   try {
     capturePlayer = Manager.createPlayer("capture://audio");
     if (capturePlayer != null) {
       capturePlayer.realize();
       recordControl = (RecordControl) capturePlayer
           .getControl("javax.microedition.media.control.RecordControl");
       display.setCurrent(alert);
       if (recordControl == null)
         throw new Exception("No RecordControl available");
       bos = new ByteArrayOutputStream(1024);
       recordControl.setRecordStream(bos);
     } else {
       throw new Exception("Capture Audio Player is not available");
     }
   } catch (Exception e) {
     error(e);
   }
 }
 public void startApp() {
   try {
     capturePlayer.start();
     recordControl.startRecord();
     Thread.sleep(10000);
     recordControl.stopRecord();
     recordControl.rumit();
     capturePlayer.stop();
     alert.setString("Well done!");
     bos.flush();
     bis = new ByteArrayInputStream(bos.toByteArray());
     playbackPlayer = Manager.createPlayer(bis, recordControl.getContentType());
     playbackPlayer.start();
     alert.setString("Playing back ... ");
   } catch (Exception e) {
     error(e);
   } finally {
     try {
       if (bos != null)
         bos.close();
       if (bis != null)
         bis.close();
     } catch (Exception ex) {
       error(ex);
     }
   }
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }
 public void commandAction(Command cmd, Displayable disp) {
   if (cmd == exitCommand) {
     notifyDestroyed();
   }
 }
 private void error(Exception e) {
   alert.setString(e.getMessage());
   alert.setTitle("Error");
   display.setCurrent(alert);
   e.printStackTrace();
 }

}</source>

Save Captured Audio

   <source lang="java">

import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.media.Manager; import javax.microedition.media.Player; import javax.microedition.media.control.RecordControl; import javax.microedition.midlet.MIDlet; public class SaveCapturedAudioMIDlet extends MIDlet implements CommandListener {

 private Display display = null;
 private Alert alert = new Alert("Message");
 private Command exitCommand = new Command("Exit", Command.EXIT, 1);
 private Player capturePlayer = null;
 private Player playbackPlayer = null;
 private RecordControl rControl = (RecordControl) capturePlayer.getControl("javax.microedition.media.control.RecordControl");
 public SaveCapturedAudioMIDlet() {
   display = Display.getDisplay(this);
   alert.setTimeout(Alert.FOREVER);
   alert.setString("Capturing for 10 seconds.");
   alert.addCommand(exitCommand);
   alert.setCommandListener(this);
   try {
     capturePlayer = Manager.createPlayer("capture://audio");
     if (capturePlayer != null) {
       capturePlayer.realize();
       display.setCurrent(alert);
       if (rControl == null)
         throw new Exception("No RecordControl available");
       rControl.setRecordLocation("file:///test.wav");
     } else {
       throw new Exception("Capture Audio Player is not available");
     }
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
 public void startApp() {
   try {
     capturePlayer.start();
     rControl.startRecord();
     Thread.sleep(10000);
     rControl.stopRecord();
     rControl.rumit();
     capturePlayer.stop();
     capturePlayer.close();
     playbackPlayer = Manager.createPlayer("file:///test.wav");
     playbackPlayer.start();
   } catch (Exception e) {
     e.printStackTrace();
   }
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }
 public void commandAction(Command cmd, Displayable disp) {
   if (cmd == exitCommand) {
     destroyApp(true);
     notifyDestroyed();
   }
 }

}</source>