Re: More of Process
Re: More of Process
- Subject: Re: More of Process
- From: "john smith" <email@hidden>
- Date: Fri, 04 Nov 2005 00:41:48 +0100
Jeff,
Thanks for your reply.
Surely there's some misunderstanding here. All I'm trying to do is to make
simple Audio Units (plug-ins).
When I refer to "channel dependencies" I mean that it cannot work on
channels independently. For instance, a reverb will often write to 2 output
channels simultaneously.
The kernel process I'm talking about is the kernel class living inside the
main AU class, when creating an AU using the xcode template. I believe the
full name of the class is AUKernelBase.
Thanks anyway.
Michael Olsen
I'll let someone else address your AU programming questions, but I'll take
a stab at answering your initial question about system-wide processing.
First off, AudioUnits are not available to kernel entities. AU's are
user-land only constructs. So, if you intend on providing a pluggable
means of adding processing, you're on your own.
Secondly, there is no API for providing system-wide processing of input or
output data. The architecture we have for devices does not lend itself to
that sort of operation. So to implement it, you have to, by definition,
hack the system. For IOAudio-based devices, you'd need to figure out how
to glom onto each individual driver (in the kernel) and inject your
processing code into it's data handling. Granted, the IOAudio family makes
that somewhat easier by providing the framework on which all the drivers
are based, but it's still not a job for the faint of heart and likely
would not work with all bits of hardware.
Another solution would be some kind of re-direction solution like what
AudioHijack or Jack do and, in a very primitive way, what the
AudioReflectorDriver sample code does. You'd redirect the data to your
processing code and then direct it at the actual bit of hardware.
On Nov 3, 2005, at 2:29 PM, john smith wrote:
Hi,
as I mentioned in a previous letter I'm unable to locate any
documentation for the kernel Process, except that "this is where you
process the audio".
--
Jeff Moore
Core Audio
Apple
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