Re: AU Cleanup / destructor, what to do in which method?
Re: AU Cleanup / destructor, what to do in which method?
- Subject: Re: AU Cleanup / destructor, what to do in which method?
- From: William Stewart <email@hidden>
- Date: Mon, 14 Aug 2006 12:21:23 -0700
I wouldn't make any assumptions about "only once" - if you look
through the code in AUBase you'll see that it manages this for you
(so a client can call AudioUnitInitialize on your AU multiple times,
but you'll only have your Init... method called once.
Cleanup can be called in response to either AudioUnitUninitialize or
when the AU is destroyed...
Bill
On 11/08/2006, at 2:41 PM, Chris wrote:
Thanks,
this wasn't clear in my mind because in the doc, Cleanup is not
used, Uninitialize is used in place (no explicit links between the
two).
and in the AUBase code, we have DoInitiaze and DoCleanup with a
comment saying there purpose is to ensure Initialize/Cleanup is
called only once. Should be "Only once after constructor or
cleanup" for Initialize and "Only after Initialize, and only once
for Cleanup".
Regards,
Chris
Cleanup is called by the AudioUnitUninitialise API call.
The Destructor is called by closing the audio unit (CloseComponent)
If a host app has to do a format change for instance, then it will
Uninitialise your AU, make the change, and reinitialise your AU.
There are some things you might decide to do when you are first
Initialised (that you would cleanup when you are closed for
instance), but you wouldn't clean these up in the Uninit call
(Cleanup)
There's some commentary about the Init/Uninit Open/Close states in
the AU docs: /Developer/Examples/CoreAudio/Documentation/
Bill
On 10/08/2006, at 1:11 PM, Chris wrote:
Hi,
I'm wondering what to do in the destructor of my AU (inheriting
from AUBase) versus what to do in Cleanup method.
If Cleanup is freeing everything, then we don't need to do
anything in destructor.
Is Cleanup always preceding the destruction of the AU (AU
lifecycle : construction/Initialize/Work/Cleanup/Destruction)?
Best regards
Chris
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