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Audio pitch shift using objective-c - iOS

问题描述:

I'm making an app where I gotta record sound through microphone, change its pitch, save it in Documents Directory and play it.

I have accomplished the recording and playing part successfully via AVRecorder and AVAudioPlayer. But I'm unable to change the pitch of the recorder sound :(

Searched a lot all over StackOverlow and Google, but all methods aren't working. DIRAC is not available now I guess, SoundTouch integration is going over my head, other solutions are in Objectice-C++ which I don't understand.

Also tried OpenAL, but it only allows to play the changed pitch sound, not save it.

Please tell me if it's possible using Objective-C, or any other example/tutorial.

Thank you.

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