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Pitch Shifting and File Saving Problem
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Pitch Shifting and File Saving Problem


  • Subject: Pitch Shifting and File Saving Problem
  • From: Mathew iprocessor <email@hidden>
  • Date: Tue, 22 Oct 2013 12:01:38 -0600

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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