Re: HAL, AudioUnits, OS X, QuickTime (was: Re: Device unplugged, how application should handle the situation?)
Re: HAL, AudioUnits, OS X, QuickTime (was: Re: Device unplugged, how application should handle the situation?)
- Subject: Re: HAL, AudioUnits, OS X, QuickTime (was: Re: Device unplugged, how application should handle the situation?)
- From: Jeff Moore <email@hidden>
- Date: Mon, 14 Nov 2005 12:42:27 -0800
First off, I don't think that it is at all unreasonable for your
application to require an up-to-date system, regardless of what the
version of the core OS is. IMHO, a user that ignores updates does so
at their peril, especially with respect to security. But I digress.
At any rate, I don't think it matters. AUHAL has been around since I
think the first release of 10.0 in one form or another. Plus, it has
been a relatively stable piece of code. All you need to do is check
the version number (using GetComponentVersion()) of the instance of
AUHAL you get and to interact with it accordingly. I suspect that you
may find that there are very few changes you need to make when
supporting one version of the component versus the others.
That said, I have no idea about the specific differences in
functionality in AUHAL on the stock 10.2 system and on one upgraded
with QT 6.5.
On Nov 14, 2005, at 5:58 AM, Rustam Muginov wrote:
On Nov 11, 2005, at 10:45 PM, Jeff Moore wrote:
I'd use AUHAL, which has support for all of that.
Jeff, thank you for your explanations/suggestions.
I am started to look into AU docs/samples and they realy looks like
more convinient, higher-level aproach instead of low-level HAL
approach.
I am curious about how AU functionality depends on MacOS X and
QuickTime versions?
The technote
http://developer.apple.com/technotes/tn2002/tn2091.html
says:
Note: System Requirements: Panther and Jaguar systems with
QuickTime v6.5 installed.
Chances are high that our software would have to support OS X 10.2.
Is where a reference about which functionalities (HAL and AU) is
built-in into standard MacOS X version, and which is brought by the
QuickTime updates?
I am not sure if it would be OK to require user to update his
QuickTime installation to use software if AudioUnit approach relyes
on the QT 6.5 or later.
Thank you.
--
Sincerely,
Rustam Muginov
--
Jeff Moore
Core Audio
Apple
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