PulpCore music playback - loop sound and animate volume
- by Peter Perhác
I have been experimenting with PulpCore, trying to create my own tower defence game (not-playable yet), and I am enjoying it very much I ran into a problem that I can't quite figure out. I extended PulpCore with the JOrbis thing to allow OGG files to be played. Works fine. However, pulpCore seems to have a problem with looping the sound WHILE animating the volume level. I tried this with wav file too, to make sure it isn't jOrbis that breaks it. The code is like this:
Sound bgMusic = Sound.load("music/music.ogg");
Playback musicPlayback;
...
musicVolume = new Fixed(0.75);
musicPlayback = bgMusic.loop(musicVolume);
//TODO figure out why it's NOT looping when volume is animated
// musicVolume.animate(0, musicVolume.get(), FADE_IN_TIME);
This code, for as long as the last line is commented out, plays the music.ogg again and again in an endless loop (which I can stop by calling stop on the Playback object returned from loop(). However, I would like the music to fade in smoothly, so following the advice of the PulpCore API docs, I added the last line which will create the fade-in but the music will only play once and then stop. I wonder why is that? Here is a bit of the documentation:
Playback
pulpcore.sound.Sound.loop(Fixed level)
Loops this sound clip with the
specified volume level (0.0 to 1.0).
The level may have a property
animation attached.
Parameters: level
Returns: a Playback object for this
unique sound playback (one Sound can
have many simultaneous Playback
objects) or null if the sound could
not be played.
So what could be the problem? I repeat, with the last line, the sound fades in but doesn't loop, without it it loops but starts with the specified 0.75 volume level.
Why can't I animate the volume of the looped music playback? What am I doing wrong? Anyone has any experience with pulpCore and has come across this problem? Anyone could please download PulpCore and try to loop music which fades-in (out)?
note: I need to keep a reference to the Playback object returned so I can kill music later.
