Re: Converting an AUGraph to offline mode
Re: Converting an AUGraph to offline mode
- Subject: Re: Converting an AUGraph to offline mode
- From: tahome izwah <email@hidden>
- Date: Mon, 21 Mar 2011 18:55:35 +0100
Any word on this?
--th
2011/2/17 Brian Willoughby <email@hidden>:
> 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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