Re: AUBufferList::CopyBufferContentsTo()
Re: AUBufferList::CopyBufferContentsTo()
- Subject: Re: AUBufferList::CopyBufferContentsTo()
- From: William Stewart <email@hidden>
- Date: Tue, 29 Mar 2005 11:20:32 -0800
On 29/03/2005, at 2:57 AM, Raphael Dinge wrote:
Hi,
This has been already discussed on this list, but I would
like to give more informations.
If I put an instance of my plugin in *mono to stereo* mode,
it will crash in DP 4.52.
This will occurs in the bypassed part of the AU SDK render code.
At that moment, AUBufferList::CopyBufferContentsTo() will
receive a list of buffers to copy, but there is only
1 src buffer and 2 dst buffers.
Doug already said on that problem : (2004/12/22)
This "shouldn't happen."
When it does happen, there's probably a discrepency between the
format of the AU's bus and the buffer the caller is asking you to
render into ...
So what should be the bus format in the mono to stereo mode
for src and dst buffers ?
1 src buffer is invalid ?
Is this a DP problem ? AU SDK problem ? Plugin problem ?
I would have said that it was a SDK problem, but given Doug
reply, this is no more clear for me.
Many thanks for any informations,
We've just been discussing this with other developers and I've now
written a test case for auval (that I'll be seeding shortly) that
catches this problem.
AUEffectBase has been written and tested primarily to do N-N channel
effects. Thus, all the logic here about:
kernel's for processing each channel
in place and bypass implementations
the render implementation in general
If you are going to use AUEffectBase to do N-M channel effects there
are a number of behaviours you need to over-ride if you are still
going to use this class. As a side note, we subclass AUBase when we
do these kinds of AU's and that has generally been our recommendation.
Bill
--
========================================+===================
Raphael Dinge | Ohm Force
DSP developer & Software designer | DA Software
mailto:email@hidden | www.ohmforce.com
========================================+===================
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