Play Multiple iPod Library Songs On iPhone At The Same Time With Pitch Bending & Other Effects

Posted by Dino on Stack Overflow See other posts from Stack Overflow or by Dino
Published on 2011-01-28T09:48:45Z Indexed on 2011/02/06 7:25 UTC
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Filed under:

iphone

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objective-c

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music

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ipod

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openal

Hi,

I have been going at this for the past two weeks and it is driving me crazy. I asked this question a couple of days ago (Extract iPod Library raw PCM samples and play with sound effects) and whilst the answer got me half way there I am still stuck.

Basically what I am trying to achieve is load up multiple songs from the iPod library for playback with effects such as pitch bend, eq effects etc...

I have gone down the route of AVPlayer and AVAudioPlayer which are too simple. The only framework I've seen that can play audio with these effects is OpenAL. I have tried a few objective c wrappers (Finch and ObjectAL) Finch does not play compressed audio whilst ObjectAL will only convert it for me if I pass in a URL for the file (which is something I cannot do because I only have an incompatible iPod library URL).

An example of an app that does what I want beautifilly is Tap DJ. It can load up songs from the iPod library fast (unlike TouchDJ and it plays them with all sorts of effects.

Any help would be much appreciated.

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