Re: Java API sound

From:

"Oliver Wong" <owong@castortech.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 11 Jan 2007 12:06:18 -0500

Message-ID:

<e8uph.11522$9i3.41356@wagner.videotron.net>

<boutreau.adrien@gmail.com> wrote in message
news:1168251053.443856.212310@11g2000cwr.googlegroups.com...

Hi

I'm trying to use JAva sound API but I have an error on some computers
with this code :

[code snipped]

Error :
java.lang.IllegalArgumentException: Unsupported control type: Mute

Is there a solution to control it ? Because I can control the Speaker
Sound but not microphone...

    It looks basically like certain lines don't support some of the controls
you want. I've modified your code as follows:

<SSCCE>

import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.BooleanControl;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.Line;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.Mixer;

public class ControlTest {

public static void main(String[] args) throws LineUnavailableException,
InterruptedException {
  Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
  for (int i = 0; i < mixerInfos.length; i++) {

   System.out.println("AudioSystem info Name:" + mixerInfos[i].toString());
   Mixer mixer = AudioSystem.getMixer(mixerInfos[i]);

   Line.Info[] targetLineInfos = mixer.getTargetLineInfo();
   System.out.println("target infos : " + targetLineInfos.length);
   for (int j = 0; j < targetLineInfos.length; j++) {
    try {
     setVolume(targetLineInfos[j]);
    }
    catch (IllegalArgumentException e) {
     continue;
    }
   }
  }
}

static void setVolume(Line.Info lineInfo) throws LineUnavailableException {
  System.out.println(lineInfo);
  Line line = AudioSystem.getLine(lineInfo);
  System.out.println(" open " + line.getLineInfo());
  line.open();
  line.getControls(); /*SPECIAL LINE*/
  BooleanControl muteControl =
(BooleanControl)line.getControl(BooleanControl.Type.MUTE);
  System.out.println(" mute " + muteControl);
  muteControl.setValue(true);
  FloatControl control =
(FloatControl)line.getControl(FloatControl.Type.VOLUME);
  control.setValue(control.getMinimum());
  System.out.println(" val " + control.getValue());
  FloatControl controlp =
(FloatControl)line.getControl(FloatControl.Type.MASTER_GAIN);
  controlp.setValue(control.getMinimum());
  System.out.println(" val " + controlp.getValue());
  line.close();
}
}
</SSCCE>

Notice the line marked /*SPECIAL LINE*/. If you set a breakpoint there, you
can look at the return value of line.getControls() to see what controls a
particular line supports.

    - Oliver