Poblem with getting Control on a line

Question

Hello all,
I need to adjust the volume of a microphone.
To do that I use this code :
if (mixer.isLineSupported(Port.Info.MICROPHONE))
                         lineOut = (Port) mixer.getLine(Port.Info.MICROPHONE);
                         lineOut.open();
                         FloatControl vol = (FloatControl) lineOut.getControl(FloatControl.Type.VOLUME);
                         vol.setValue(0.4f);But when I do that, I get an Exception : java.lang.IllegalArgumentException: Unsupported control type: Volume
     at com.sun.media.sound.AbstractLine.getControl(Unknown Source)
at line      FloatControl vol = (FloatControl) lineOut.getControl(FloatControl.Type.VOLUME); ....
I tried with
FloatControl vol = (FloatControl) lineOut.getControl(FloatControl.Type.BALANCE);
FloatControl vol = (FloatControl) lineOut.getControl(FloatControl.Type.MASTER_GAIN);
but each time I get the Exception.
Do you know what's wrong or do you have an another way to get Controls on a the microphone ?
Edited by: ihewinp on Jan 16, 2009 2:45 PM

Answer 1

Take a look at the following article.
[http://www.vsj.co.uk/java/display.asp?id=370]
It has some example code that probes the system for ports, and probes the ports for all implemented controls. Should be able to help you. A lot.