Re: Render callback disappearing (QT 7.0)
Re: Render callback disappearing (QT 7.0)
- Subject: Re: Render callback disappearing (QT 7.0)
- From: William Stewart <email@hidden>
- Date: Tue, 10 May 2005 14:30:36 -0700
On 10/05/2005, at 1:23 PM, Dominic Feira wrote:
I have verified that AudioUnitRender is in fact not returning an
error. The graph functions properly sometimes, yet others it does
not. I did CAShow(myGraph) as you suggested, and the output looks
the same regardless of wether its working or not.
AudioUnitGraph 0x1827334:
Member Nodes:
node 1: desc aufc conv appl, instance 0x870008 O I
node 2: desc aumx smxr appl, instance 0x870009 O I
node 3: desc aufx greq appl, instance 0x87000A O I
node 4: desc aufc conv appl, instance 0x87000B O I
ok - but where is your output unit in this graph.
A graph *must* have an output unit (even if its just the generic one
and the GenericOutput unit we ship (auou genr appl - Apple:
GenericOutput) does everything that the converter unit will do as
well. I'd use this as your node 4 I think.
Without that, the graph is really not going to be in a predictable
state - for instance, calling AUGraphStart is going to fail...
Bill
Connections:
node 1 bus 0 => node 2 bus 0
node 2 bus 0 => node 3 bus 0
node 3 bus 0 => node 4 bus 0
Events to be updated:
CurrentState:
mLastUpdateError=0, eventsToProcess=F, isRunning=F
As I mentioned in my first (more lengthy) e-mail, this graph is
being used as an offline renderer and the callbacks at the leafs of
the graph can lock. Perhaps the locking is causing a problem.
Dominic Feira / Code Monkey / Ambrosia Software, Inc.
On May 10, 2005, at 3:24 PM, William Stewart wrote:
Are you sure your graph is all wired up? (Try CAShow(myGraph)
Are you sure you are getting noErr result from AudioUnitRender?
Bill
On 10/05/2005, at 10:19 AM, Dominic Feira wrote:
Hello. I'll keep this short. Last time everybody's eyes
probably glazed over.
What can cause a Render callback on an audio unit to not be
called? Notably, the render callback is called one or two times,
but then is called no longer, even though I know AudioUnitRender
is being called on the graph. This is only happening on systems
with Quicktime 7.0. Systems with 6.5.x are not affected. No
errors are reported during setup of the graph or when calling
AudioUnitRender.
Thanks.
Dominic Feira / Code Monkey / Ambrosia Software, Inc.
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