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  time scaling with OpenAL  (Read 1949 times)
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Offline weston

Junior Member





« Posted 2005-02-13 06:58:01 »

Anyone know how to scale the playback rate of sounds with openal? I'm trying to create a slow motion effect and I need my sounds to slow down by the same amount as the rest of the game and I've got no idea how to go about doing this. I would assume its possible to do with openal but I havn't found any info on it.

Any information on how to do this would be appreciated, I can't seem to find anything with google... I have a feeling I just don't know what the effect I'm trying to achieve is actually called Embarrassed

for(int i = 1; i > 0; i++)
{
System.out.println(i+" cups of java downed");
}
Offline oNyx

JGO Coder


Medals: 1


pixels! :x


« Reply #1 - Posted 2005-02-13 11:44:53 »

It's either resampling - length/pitch get modified (deeper in your case) or time stretching - length changes and the pitch remains the same.

弾幕 ☆ @mahonnaiseblog
Offline princec

JGO Kernel


Medals: 340
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Eh? Who? What? ... Me?


« Reply #2 - Posted 2005-02-13 11:49:51 »

Cheapass effect time! Just lower the pitch to 0.1 Smiley

Cas Smiley

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Offline weston

Junior Member





« Reply #3 - Posted 2005-02-13 17:46:07 »

I don't think lowering the pitch will work for what I'm trying to do. The problem is that I could have an animation or something that corresponds with a sound effect, if the animation slows down then the sound needs to slow down as well so that they both end at the same time.

onyx: How can I change the length? it seems pretty clear how to change the pitch, but I've seen nothing about a length attribute. I searched google some more for 'openal time stretching' but I still can't find anything Sad

for(int i = 1; i > 0; i++)
{
System.out.println(i+" cups of java downed");
}
Offline princec

JGO Kernel


Medals: 340
Projects: 3
Exp: 16 years


Eh? Who? What? ... Me?


« Reply #4 - Posted 2005-02-13 20:41:11 »

I think you'll find that a sound played at half the pitch will take twice as long to play...

Cas Smiley

Offline weston

Junior Member





« Reply #5 - Posted 2005-02-13 22:10:10 »

oh, did not know that Embarrassed thnx.

for(int i = 1; i > 0; i++)
{
System.out.println(i+" cups of java downed");
}
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