Play a mp3 in slow/fast

I want to add to my app the ability to play songs in slow\fast motion. from a research i done it can be done in two way in iphone : OpenAL and soundtouch.

I am looking for some开发者_StackOverflow中文版thing that can help add one of them to my project and to use them.

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I had the same problem and just resolved in the following way

If you have any questions I can help you

Install cocos2d http://www.cocos2d-iphone.org/download

and with this you can play fast or slow file

[[SimpleAudioEngine sharedEngine] playEffect: (NSString *) pitch (float32) pan (float32) gain (float32)]