Re: Converting an AUGraph to offline mode
Re: Converting an AUGraph to offline mode
- Subject: Re: Converting an AUGraph to offline mode
- From: Brian Willoughby <email@hidden>
- Date: Thu, 17 Feb 2011 00:23:57 -0800
This will be the fifth time I've asked. At least two other prominent
members of the mailing list are also interested in an answer.
Brian Willoughby
Sound Consulting
On Jan 11, 2011, at 19:15, Brian Willoughby wrote:
Is there really nobody who can tell me whether it's possible to use
an AUGraph for offline rendering, when the graph contains a mixture
of AudioUnits that do not directly support offline mode?
On Jan 3, 2011, at 11:37, Brian Willoughby wrote:
Can anyone comment on the feasibility of using AUGraph to render
in offline mode when combining AudioUnits of both the offline and
non-offline variety? As I mention, some of the Apple AUs do not
support offline mode, and thus do not seem to play well in the
graph (unless I'm missing something).
On Dec 28, 2010, at 04:56, Brian Willoughby wrote:
Perhaps I should preface my question by pointing out that I want
to include AudioUnits in my AUGraph which do not support
kAudioUnitProperty_OfflineRender with those that do. So, another
way to phrase my question is: Can you combine offline and non-
offline AUs in the same graph for use in offline mode? If not,
how are normal effects supposed to be used when bouncing a file
if some of the plugins in the graph are offline and some do not
support that mode?
On Dec 28, 2010, at 04:45, Brian Willoughby wrote:
I have an AUGraph that is rendering properly to a file. I would
like to convert this to offline mode, but it doesn't seem that
AUGraph passes through the kAudioOfflineUnitRenderAction_*
flags. In other words, when I call AudioUnitRender(), I start by
passing in kAudioOfflineUnitRenderAction_Preflight and loop until
kAudioOfflineUnitRenderAction_Complete is set, then I pass in
kAudioOfflineUnitRenderAction_Render until
kAudioOfflineUnitRenderAction_Complete is set. My AUGraph has a
Matrix Mixer feeding High Pass Filter and Peak Limiter and ending
with the Generic Output. The head of this AUGraph is a callback
which uses ExtAudioFileRead() after checking the
AudioUnitRenderActionFlags, but it seems that I never get any
flags but 0.
The example offline host code only sets up a single AudioUnit,
not a full AUGraph. So, I'm wondering what an AUHost is supposed
to do when there is a whole graph of AudioUnits that need to be
run offline, e.g., for bouncing to disk. Don't tell me that you
must setup separate callbacks for every AU and call them
independently for offline mode!
What I had hoped was that my flags would be passed through from
AudioUnitRender() to the head of my graph, where my callback can
use the ExtAudioFile to determine when to set the _Complete bit.
Apparently, the Apple AUs overwrite the flags on return, or
perhaps do not even pass them down when pulling their input data
on render.
Has anyone worked with a full AUGraph in offline mode? I'd
appreciate any comments or guidelines. The CoreAudio Mailing
List archives do not seem to cover this combination.
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