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How to record user generated sound on iPhone

I have a series of sounds that the user will play, modify and edit, etc., using my application. When the user is ready, I want them to be able to save their work and record it in mp3.

I do not want to play it through the speakers and record it using a microphone, as this will lead to poor sound quality and interference. I can not think of any ways to do this, which does not require additional equipment and / or a computer.

How to do this using only their device?

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Well, I would say that this is not possible with AVFoundation.

My suggestion is to use Audio Units and convert all your interactions into a sound graph. at some point you set a rendering alert on RemoteIO so that every time it plays sounds for speakers, you get a callback where you can write it to these files / packages / data in a file.

I probably suggest using AAC (m4a) on top of MP3s. I don't really like MP3s, and frankly, as far as I know, sdk does not provide encoding to MP3s, possibly due to licensing issues. I could be wrong. Check out this code example below, probably the best code example you'll ever find on audio devices on the Internet.

AudioGraph by Tom Zic

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