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How to set gain (volume) using JMF?

Posted on 2004-03-22
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Last Modified: 2012-06-27
Hi,

I want to play some sound files with java using the JMF (as backgroundmusic) so I want to use sliders to change the volume (or gain) while playing the music.
How do I do this?

I am using code like this to play the sound

public SoundDemo(String resourceName)
      {
            System.out.println("Playing: " + resourceName);
            
            try
            {
                  URL url = this.getClass().getResource(resourceName);
                  System.out.println(url);
                  
//                  Player p = Manager.createPlayer(url);
                  p.start();
                  int state = p.getState();
                  while (state != Controller.Started)
                  {
                        try
                        {
                              Thread.sleep(100);
                              state = p.getState();
                        }
                        catch (Exception e)
                        {
                              e.printStackTrace();
                        }
                  }
                              }
            catch (Exception e)
            {
                  e.printStackTrace();
            }
      }

so the sound is played fine, I do not know how to access (or use) the getDB() and setDB() methods provided from JMF.
I tried p.getGainControl(); to use these methods.

Anybody any idea how to set the volume from a player object from the Java Media Framework?

Thank you for your help!

CU gnurl
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Question by:gnurl
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6 Comments
 
LVL 17

Expert Comment

by:krakatoa
ID: 10652788
Take a look at the GainControl interface.
0
 
LVL 17

Expert Comment

by:krakatoa
ID: 10652816
and ...

getControlComponent
public java.awt.Component getControlComponent()Get the Component associated with this Control object. For example, this method might return a slider for volume control or a panel containing radio buttons for CODEC control. The getControlComponent method can return null if there is no GUI control for this Control.
0
 
LVL 7

Author Comment

by:gnurl
ID: 10653060
Hi,

I played around with these objects, but I couldn't get it working.

How do I connect the slider to the player? Do you have any code examples?

Thanks!
0
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LVL 17

Accepted Solution

by:
krakatoa earned 500 total points
ID: 10653695
// To create a Clip object, see e723 Loading and Playing Sampled Audio
   
    // Set Volume
    FloatControl gainControl = (FloatControl)clip.getControl(FloatControl.Type.MASTER_GAIN);
    double gain = .5D;    // number between 0 and 1 (loudest)
    float dB = (float)(Math.log(gain)/Math.log(10.0)*20.0);
    gainControl.setValue(dB);
   
    // Mute On
    BooleanControl muteControl = (BooleanControl)clip.getControl(BooleanControl.Type.MUTE);
    muteControl.setValue(true);
   
    // Mute Off
    muteControl.setValue(false);


from java almanac


Home > List of Packages > javax.sound.midi  [7 examples] > Properties  [4 examples]

e721. Setting the Volume of Playing Midi Audio
    // To create a Sequencer object, see e716 Loading and Playing Midi Audio
   
    if (sequencer instanceof Synthesizer) {
        Synthesizer synthesizer = (Synthesizer)sequencer;
        MidiChannel[] channels = synthesizer.getChannels();
   
        // gain is a value between 0 and 1 (loudest)
        double gain = 0.9D;
        for (int i=0; i<channels.length; i++) {
            channels[i].controlChange(7, (int)(gain * 127.0));
        }
    }

from same source. Hopefully these have one or two pointers for you.
0
 
LVL 7

Author Comment

by:gnurl
ID: 10681444
Thanks,

it seems that it works this way... :)

gnurl
0
 
LVL 17

Expert Comment

by:krakatoa
ID: 10681513
Great! Glad to hear!

k.
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