Re: Pitch Shifting and File Saving Problem

Subject: Re: Pitch Shifting and File Saving Problem
From: Aran Mulholland <email@hidden>
Date: Wed, 23 Oct 2013 12:05:25 +1100

You seem to be thinking that you can cast a URL to an ExtaudioFileRef when calling ExtAudioFileWriteAsync. You cant. Read the documentation here

https://developer.apple.com/library/ios/documentation/MusicAudio/Reference/ExtendedAudioFileServicesReference/Reference/reference.html

You need to create the file (outside your render callback)

Prime it (http://lists.apple.com/archives/coreaudio-api/2010/Aug/msg00000.html) if you want to write in an async manner.

Then write to it.

Close it when you have totally finished with it. (not every render callback)

I could go on, but a thorough read of the documentation is what you need to do.

On Wed, Oct 23, 2013 at 5:01 AM, Mathew iprocessor <email@hidden> wrote:

I am trying to do TimeStretching and Pitch shifting of Audio files with Audiounits dynamically. ( Trying to do Ramped Slow mo like english letter "U" behaviour)

I hope, "AudioUnits" is the only option apart from other third party frameworks like Dirac,etc. Is there any other possibility with IOS-SDK API's(apart from Audiounits)?

Kindly check this link for my project workspace.
https://drive.google.com/folderview?id=0BxlMIbXuP5iFU2tWeFYza1U5aG8&usp=sharing

For a quick view, http://pastebin.com/7WF9DyXX has the main code.
I am able to vary the time shifting.
My problem:
I don't know how to save the audio file after pitch shifting. Also, in my real time, the pitch shifting will be dynamic.
In my render callback, the method "ExtAudioFileWriteAsync" returns -50.
Please help me guys.

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References:
	>Pitch Shifting and File Saving Problem (From: Mathew iprocessor <email@hidden>)

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