Re: Using 3d mixer and AUGraph
Re: Using 3d mixer and AUGraph
- Subject: Re: Using 3d mixer and AUGraph
- From: William Stewart <email@hidden>
- Date: Mon, 6 Feb 2006 11:14:36 -0800
On 04/02/2006, at 9:05 AM, Bob Lang wrote:
Hi everyone
I've been a long time lurker and occasional poster to this group,
and I thought it's about time to put Java to one side and get to
grips with Core Audio!
I'm trying to set up an AUGraph which links a number of separate
audio sources into a 3d mixer and then to the default output. I
want each of the audio sources to supply audio data via a render
callback, but at different sample rates and formats. Here's my
question: what sort of audio unit must I use for each input node
to the 3d mixer, and how should they be set up? FWIW I'm using C++.
This is exactly what our Open AL implementation does - including
taking advantage of a feature in the 3DMIxer that enables sample rate
conversion on inputs. You might want to consider using OpenAL to do
this - alternatively, the OAL implementation is available in source
form from http://openal.org/
As a supplementary question, Apple supplies a large number of
different AUs. Is there a single document which gives a detailed
description of each sort of AU, in terms of what processing it
performs, its strengths, weaknesses and limitations, and (most
importantly) which parameters must be used to get it working
correctly? Knowing that (say) a FormatConverterAU exists is one
thing - but knowing how to set it up to work as required is
something else!
No, but this is something the documentation people have in their plans.
Bill
Many thanks in advance
Bob
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