Change Clip using reflaction

From:
Andrew Thompson <andrewthommo@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 23 Jul 2009 14:02:23 -0700 (PDT)
Message-ID:
<ac33d889-f097-4b5c-8776-169e0eb285db@d9g2000prh.googlegroups.com>
The javax.sound.sampled.Clip is a handy little class for small
clips, but it does not handle large clips (even if the JRE has
increased memory). I am trying* (and failing**) to alter the
returned clip to support a larger buffer.

Should this be possible, using reflection?

If so. How?

If not. Are there alternatives to this approach (short of
re-implementing Clip)?

*
<sscce>
import javax.sound.sampled.*;
import java.lang.reflect.*;

class TestClip {

  static public String getBufferString(int size) {
    return
      "Clip buffer size " +
      size +
      ". Enough buffer for " +
      size/(44100.0*4) +
      " sec of CD quality!";
  }

  public static void main(String[]args) throws Exception {
    Clip clip = AudioSystem.getClip();

    System.out.println( getBufferString(clip.getBufferSize()) );

    Class clipClass = clip.getClass();

    Method[] methods = clipClass.getMethods();
    for (Method method : methods) {
      if (method.getName().indexOf("setBufferSize")>-1) {
        method.setAccessible(true);
        method.invoke(clip, clip.getBufferSize()*8);
      }
    }

    System.out.println( "After 1st attempt." );
    System.out.println( getBufferString(clip.getBufferSize()) );

    DataLine dl = (DataLine)clip;
    Class dlClass = dl.getClass();
    methods = dlClass.getMethods();
    for (Method method : methods) {
      if (method.getName().indexOf("setBufferSize")>-1) {
        method.setAccessible(true);
        method.invoke(dl, clip.getBufferSize()*8);
      }
    }

    System.out.println( "After 2nd attempt." );
    System.out.println( getBufferString(clip.getBufferSize()) );
  }
}
</sscce>

**
<op>
andrew@pc1:/media/disk$ java TestClip
Clip buffer size 88200. Enough buffer for 0.5 sec of CD quality!
After 1st attempt.
Clip buffer size 88200. Enough buffer for 0.5 sec of CD quality!
After 2nd attempt.
Clip buffer size 88200. Enough buffer for 0.5 sec of CD quality!
andrew@pc1:/media/disk$
</op>

--
Andrew T.
pscode.org

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