Re: multichannel, stateful AU; non-interleaved data
Re: multichannel, stateful AU; non-interleaved data
- Subject: Re: multichannel, stateful AU; non-interleaved data
- From: William Stewart <email@hidden>
- Date: Wed, 08 Dec 2004 11:15:20 -0800
On 7/12/04 7:42 PM, "Will Benton" <email@hidden> wrote:
> Hello list,
>
> I am interested in writing an AU effect that operates either in mono or
> on n channels. I will need to allocate some per-channel state (i.e.
> that persists between process() calls), but my effect does not assume
> any relationship between the channels. Am I correct in assuming that I
> can allocate my state buffers in the kernel constructor? (That is,
> will an effect kernel's process() method always be called with the same
> number-of-channels parameter?)
Once an AU is initialized, it will have the same number of channels for in
and out - the base classes (AUEffectBase) explicitly dis-allows any change
to the formats once the AU is initialized..
> Also, it would be extremely convenient if I could operate on
> non-interleaved data.
It does
> SampleEffectUnit in the developer tools operates
> on interleaved data;
It has some capability to do that, but the data you get is de-interleaved
(there's some history here that is no longer relevant)
> is there any example code or documentation on how
> to write an effect that operates on non-interleaved data? (Is this
> supported by all hosts?) More generally, is the "Audio and MIDI on Mac
> OS X" from 2001 on Apple's web site the most recent available
> documentation?
No - the best documentation for an AU is in the SDK:
/Developer/Examples/CoreAudio/Documentation
(if you're on an older system its /Developer/Documentation/CoreAudio/)
Bill
> Thanks for your help!
>
>
>
>
>
> best,
> wb
>
> ---
> Will Benton <email@hidden>
> coordinates: http://www.cs.wisc.edu/~willb/willb.vcf
>
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Coreaudio-api mailing list (email@hidden)
> Help/Unsubscribe/Update your Subscription:
>
> This email sent to email@hidden
--
mailto:email@hidden
tel: +1 408 974 4056
__________________________________________________________________________
Culture Ship Names:
Ravished By The Sheer Implausibility Of That Last Statement [GSV]
I said, I've Got A Big Stick [OU]
Inappropiate Response [OU]
Far Over The Borders Of Insanity And Still Accelerating [Eccentric]
__________________________________________________________________________
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden