Re: Render callback disappearing (QT 7.0)
Re: Render callback disappearing (QT 7.0)
- Subject: Re: Render callback disappearing (QT 7.0)
- From: Dominic Feira <email@hidden>
- Date: Tue, 10 May 2005 20:30:36 -0400
I followed the suggestion with great anticipation. Yet, the problem
still persists. Sometimes the appropriate calllback at the beginning
of the graph is called, sometimes it is not.
In an effort to narrow down the problem, I removed the mixer and the
equalizer. Left with a graph that is only 2 converters (yeah, I know
pointless, just testing...) everything works fine. If I have 3
converters everything is still fine (yep, still pointless). However,
if I add a mixer, an equalizer, or a delay unit things sometimes fail.
Is the graph enforcing some sort of real-time requirement and
disabling nodes? I am using the graph in an offline context.
Perhaps I need to inform the graph of this? Again, none of these
problems show up on with QT 6.5, only with QT 7.0 installed have
these problems shown up.
Dominic Feira / Code Monkey / Ambrosia Software, Inc.
On May 10, 2005, at 5:30 PM, William Stewart wrote:
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
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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