Re: [JAVA3D] Adding sound to a Java3d application

[Guy Carpenter]

I have some sample code that works with point sounds,
but I think it should be fairly trivial to convert it to use
background sounds.
Here's the smallest standalone sound sample I've
been able to create:
        http://clearwater.com.au/java/J3DSound6.java
Maybe that will help get you going.
Cheers,
Guy.
P.S. There are several problems with the sound implementation.  Below
are a couple issues I have explored.  I'm including them also because they
include links to more audio sample code.
Bug 4787253 - Sound setEnable(false) not work
OS VERSION
        Windows 2000
OVERVIEW
        when using the Sound.setEnable(boolean) method to stop and restart an
        audio clip, if the audio clip is enabled immediately after it is
disabled (or
        completes), it continues playing after it is subsequently disabled.
        1) sound.setEnable(true)                // sound starts playing
          (time passes)
        2) sound.setEnable(false)       // sound stops playing
        3) sound.setEnable(true)                // sound starts playing again
          (time passes)
        4) sound.setEnable(false)       // sound SHOULD stop but continues
        At (4) sound node enters some sort of invalid state where it
continues
        to play the original sound, but can be re-enabled and it will play
a mix
        of the continuing stream and a new stream, with both played out at
        an accelerated rate.
WORKAROUND

        Adding a sleep of >100ms between (2) and (3) above seems to
prevent the problem.
REPRO
        The sample code at
                http://clearwater.com.au/java/J3DSound8.java
        reproduces the problem.
        Note that there is an
        if (false) {
                wait()
        }
        block at the end of the program that enables the workaround.


Bug 4787026 - Sound.setRelease(true) is not yet implement
OS VERSION
        Windows 2000
TITLE
        Sound.setRelease(true) doesn't work correctly with setLoop(>0)
SUMMARY
        Calling setRelease(true) followed by setEnable(false) should allow
the
        audio to continue to the end of the current cycle.  When the sound
in question
        is set to loop, the sound continues to the end of the number of loops
        specified in the most recent call to setLoop(), including calls
made after
        the sound was enabled.  The loop count should not affect the
behavior at all.
        For example if the sound was started with
                sound.setLoop(INFINITE_LOOPS);
                sound.setEnable(true);
        and is currently in the middle of the second loop, the following
effects are observed:
        CASE 1)
        sound.setRelease(true);
        sound.setEnable(false);
        The sound continues looping infinitely insetad of stopping at the
end of the 2nd loop.
        CASE 2)
        sound.setLoop(0);
        sound.setRelease(true);
        sound.setEnable(false);
        The sound stops immediately instead of stopping at the end of the
2nd loop.
        CASE 3)
        sound.setLoop(3);
        sound.setRelease(true);
        sound.setEnable(false);
        The sound continues to the end of the 4th pass instead of stopping
at the end of the 2nd pass.
REPRO

        The code at http://www.clearwater.com.au/java/J3DSound10.java
exhibits cases 2 and 3.




At 05:45 PM 21/07/2003 -0700, Dr. Thomas wrote:
I am trying to add background sound to a Java3d
application. I have a *.wav file in my Java directory.
My program creates a "BackgroundSound" object. It also
creates a "MediaContainer" object and references to
MediaContainer object to the sound. It sets the
appropriate 'loop' values, 'initialgains', etc.  I
have found virtually nothing on this topic in Sun's
online tutorial. I have examined the SIGGRAPH 98 Java
3D technology course notes, available on line.
However, using their example has been unavailing. I
also consulted the book, "Java 3D API Jump-Start". It
provides a brief sample of code. Using their example,
my code compiles. However, it produces no sound. Does
anyone have a relatively simple example of code that
works? Conversely, can anyone refer me to literature
that explains this topic. Thank you in advance.
JT.

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