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?
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
Any further hints gratefully received :)
thanks again
Iain
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