Apple

Thanks Tom, that project is a great learning resource, a lot of things make more sense now.

One thing that I'm still having difficulty with is connecting anything to an effect unit (limiter). I know it is all there in your example but I can't see anything special being done, except maybe placing it after the mixer which maybe handles implicit format conversions? I have tried a converter unit to go from mic out format to float but it still fails when initialising the graph.

My failure to be able incorporate an effect unit makes me wonder if I was lucky getting the rest of the graph to work (mic, file player, mixer, out), despite thinking I knew what I was doing.

From: email@hidden
To: email@hidden; email@hidden
Subject: Re: IOS AUGraph: record mic and play file
Date: Mon, 12 Dec 2011 10:30:19 -0500

Hi Steven,

Check out the open source project I posted last week: http://zerokidz.com/audiograph

You will find example code to do what you are looking for. Or read this entry from Chris Adamson’s blog for the real story:

http://www.subfurther.com/blog/2009/04/28/an-iphone-core-audio-brain-dump/

Basic steps (in addition to what you already have):

- set audio session category to AVAudioSessionCategoryPlayAndRecord,

- set ASBD stream formats on the remote IO input scope output bus (and output scope input bus)

- make AUgraph connections or assign a callback.

Tom

From: steven hooley

Sent: Monday, December 12, 2011 8:33 AM

To: email@hidden

Subject: IOS AUGraph: record mic and play file

I have an AUgraph containing an AudioFilePlayer and a RemoteIO node, playback is ok. Is it possible using the same graph/remoteIO to access samples from the microphone?

I think i know how to access microphone samples using a standalone remoteIO, not part of a graph that is also playing other audio.

Any suggestions are appreciated.

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