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Re: Converting an AUGraph to offline mode
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Re: Converting an AUGraph to offline mode


  • Subject: Re: Converting an AUGraph to offline mode
  • From: Jean-Daniel Dupas <email@hidden>
  • Date: Mon, 21 Mar 2011 19:02:53 +0100

What bout opening a DTS incident ?  This is probably a better way to get an answer than bumping this subject again and again.

Le 21 mars 2011 à 18:55, tahome izwah a écrit :

> 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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-- Jean-Daniel




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  • Follow-Ups:
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      • From: Brian Willoughby <email@hidden>
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      • From: tahome izwah <email@hidden>
References: 
 >Re: Converting an AUGraph to offline mode (From: tahome izwah <email@hidden>)

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