Re: AU Host Sample?
Re: AU Host Sample?
- Subject: Re: AU Host Sample?
- From: William Stewart <email@hidden>
- Date: Mon, 24 May 2004 13:04:36 -0700
One day I'll get the name for this right!
auprocess
Bill
On 24/05/2004, at 11:20 AM, William Stewart wrote:
>
Adding to this...
>
>
There's a newer piece of code in the latest SDK called auconvert (part
>
of the new audio file tools) - that takes a file and will do a sample
>
accurate processing of a file with pretty much any type of AU
>
(providing of course that the AU's latency and tail properties are
>
correct)
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>
Bill
>
>
On 21/05/2004, at 3:15 PM, Urs Heckmann wrote:
>
>
> There are AU hosting examples in the SDK...
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>
>
> Developer/Examples/CoreAudio/Services/
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>
>
> It depends on what you want to do though. It's a bit more complex when
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> you don't use AUGraphs. In that case you have to update the TimeStamp
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> (important!), send raw MidiEvents, install Input Callback, send Render
>
> calls (better: use FastDispatch Callbacks).
>
>
>
> For convenience, there are a lot of neat utilities in PublicUtility
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> now, i.e. CAAudioUnit, CAComponent etc.
>
>
>
> Basically (uhm, very basic):
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>
>
> Setup process:
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>
>
> - Find a Component (needs ComponentType, SubType, ManufacturerID )
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> - Open the Component
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> - SetProperty kAudioUnitProperty_SetRenderCallback
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> - SetProperty kAudioUnitProperty_StreamFormat on kAudioUnitScope_Input
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> and kAudioUnitScope_Output
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> - Initialize Audio Unit
>
>
>
> Render Process:
>
>
>
> - reset AU
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> <loop>
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> - send events, i.e. MusicDeviceMIDIEvent();
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> - Call Render (AU calls your InputCallback), increasing the host Time
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> TimeStamp each call
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> </loop>
>
>
>
> Open GUI:
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>
>
> Create a WindowRef
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> Get ComponentDescription for AUViewComponent
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> OpenAComponent
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> AudioUnitCarbonViewCreate
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> Adjust window size
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>
>
> This should be 50-100 lines of code. (I've done this in a VST and an
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> AU that hosts another AU)
>
>
>
> Then, to refine everything, grab parameter list, preset list, install
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> property listeners, get/set ClassInfo etc, and tie that to your host
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> application's logic.
>
>
>
> Hope this helps for a start...
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>
>
> Cheers,
>
>
>
> ;) Urs
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>
>
>
>
> Am 21.05.2004 um 21:49 schrieb m:
>
>
>
>> Hope this is the right place...I'm trying to get started on writing
>
>> an app that needs to host AUs. The sample code I've found so far
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>> (synthtest <http://www.manyetas.com/creed/synthtest.html>) doesn't
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>> compile, and the compiled version crashes, so tha's an inauspicious
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>> start.
>
>>
>
>> The docs, while they seem thorough and acurate, merely recount facts,
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>> and don't really outline what you need to do (I'm thinking of the
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>> "Tasks" section that much of Apple's docs have).
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>>
>
>> Any pointers?
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>>
>
>> Thanks in advance!
>
>>
>
>> _murat
>
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