How to set volume of a SourceDataLine in Java

Question

I'm trying to make an mp3 player in java and I can`t figure out how to control the volume in it.

I've tried something like this:

         // Adjust the volume on the output line.
         if (dataLine.isControlSupported(FloatControl.Type.MASTER_GAIN)) {
             FloatControl volume = (FloatControl) dataLine.getControl(FloatControl.Type.MASTER_GAIN);
            volume.setValue(100.0F);
         }

Everything I have written until this code worked fine but apparently the dataLine is NOT control Supported because it jumps over this IF statement.

My question is this : Do you have any idea why this is happening and how could I work this issue around so that I could control the volume of my application?

Answer 1

OK GUYS,

I found my mess-up. I actually forgot to call the dataLine.open(audioFormat) function which acquires the system resources.

So the code workes just fine, in case anyone has this kind of problems too