Apple

On 2013-08-17, at 11:47 AM, Rob Nikander <email@hidden> wrote:

Hi,

In short: how do I know what the frame count will be, so that I can allocate AudioBufferLists before recording?

I'm following the tech note here:

http://developer.apple.com/library/mac/technotes/tn2091/_index.html

To allocate the AudioBufferLists I think I need to know how many frames it will be giving me in each render cycle -- the value of the `nFrames' parameter that will get passed to the input callback...

OSStatus myInputCallback(void *, AudioUnitRenderActionFlags *, const AudioTimeStamp *, UInt32, UInt32 nFrames, AudioBufferList *ioAbl) { ...

How do I get that from the audio unit's properties? kAudioUnitProperty_MaximumFramesPerSlice looked promising, but when I tried to read it off the input bus/element, I got the error: kAudioUnitErr_InvalidElement.

thanks,
Rob

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References:
	>Recording with AUHAL, choose buffer size? (From: Rob Nikander <email@hidden>)
	>Re: Recording with AUHAL, choose buffer size? (From: Dave Fernandes <email@hidden>)