> Hmm, I feel like a newbie who has wandered into the CoreAudio group and
> asked a really dumb question.
>
> 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?
>
> Brian Willoughby
> Sound Consulting
>
>
> 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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