Re: Two AUs in one bundle
Re: Two AUs in one bundle
- Subject: Re: Two AUs in one bundle
- From: ipmlists <email@hidden>
- Date: Sun, 30 Aug 2009 20:56:49 +0100
2009/8/28 William Stewart <email@hidden>
>
> On Aug 26, 2009, at 6:32 AM, ipmlists wrote:
>
>
> 2009/8/25 William Stewart <email@hidden>
>>
>> On Aug 24, 2009, at 5:09 AM, ipmlists wrote:
>>
>>> I'd like to combine two AUs into one bundle, so they're launched together, and both are controlled from one Cocoa view. From searching the archives, I _think_ this is possible, (this thread, for example: <http://lists.apple.com/archives/Coreaudio-api/2008/May/msg00108.html> and the earlier one it refers to) but it would be nice to get that confirmed.
>>>
>>> If so, then how do I specify their connectivity - by bundling them inside an AUGraph inside an AU?
>>
>> All that a host sees is the audio unit that you publish. How you manage the internal state is up to you - it can be as simple or complex a chain as you need
>>
>> Bill
>
> Thanks Bill. I'm afraid I'm still confused as to the plumbing of this. I now have a third AU, which contains in its constructor the AUGraph setup code (the graph is MyAU1 -> MyAU2 -> Generic I/O AU).
>
> ok
>
> What about input/output? For the output, is it just a matter of making sure the stream formats of my 'container' AU and the I/O AU match?
>
> the output of your I/O AU needs to match the output of the wrapper AU
> the input of your wrapper AU needs to match the input format of MyAU1.
> I would start by making ALL of the formats the same - stereo, 44.1, deinterleaved (which is the default). If your wrapper AU's Initialize call, you are going to have to make sure your graph is all set up with your formats, etc. I would do that and then in your wrapper AU's Initialize call, that's where you initialize the graph (and uninitialise in the DoCleanup call
>
>
> I'm guessing I then need to override ProcessBufferLists, but again, I'm not sure how...
>
> You have to:
> (1) call AudioUnitRender on your graph -
> (2) that will eventually go and call your input proc from MyAU1, from there you go and get the input in your wrapper au
> (3) then when that returns you have your audio going through your graph
> (4) it comes out at the end and you pass it back to the caller of your wrapper AU
> The PlaySequence code should help you - this examples pulls audio through a graph to write a file (Developer/Examples/CoreAudio/SimpleSDK)
> Bill
Thanks for this, Bill - very helpful. Now working on it!
Iain
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