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Re: How to capture audio generated by a render callback, iOS
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Re: How to capture audio generated by a render callback, iOS


  • Subject: Re: How to capture audio generated by a render callback, iOS
  • From: Gregory Wieber <email@hidden>
  • Date: Mon, 03 Dec 2012 09:51:12 -0800

P.S. You could add a flag 'isRecording' and if it's true, write data to the ExtAudioFile (doing some setup/teardown, etc, around setting the flag) within the RemoteIO callback.


On Mon, Dec 3, 2012 at 9:49 AM, Gregory Wieber <email@hidden> wrote:
Perhaps this will help:

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

In particular, I'd check out ExtAudioFileWriteAsync. 


On Sun, Dec 2, 2012 at 12:51 PM, Tim Kemp <email@hidden> wrote:
Hi,

My iOS synth has an AUGraph like this:

(Render callback on bus 0 input)->MultiChannelMixer->RemoteIO

(There will be a file player unit also going in to the mixer.)

The render callback gets samples in realtime from the synth engine as the user plays. I now want to record the generated sound to disk. What's the best way to hook this up? I am writing generated samples to a ring buffer already; I just need something to take them and put them in a file. Obviously this is a low priority process, so I'm not sure that I should be doing it within the render callback. (I also don't see anywhere to add a recording AU into the AUGraph; I am targeting iOS 5.0+ so I don't have a matrix mixer, which is what I originally thought of.) Should I add a render notify to the RemoteIO unit?

Thanks,

Tim



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References: 
 >How to capture audio generated by a render callback, iOS (From: Tim Kemp <email@hidden>)
 >Re: How to capture audio generated by a render callback, iOS (From: Gregory Wieber <email@hidden>)

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