Re: Audio Units vs Audio HAL? (newbie question)
Re: Audio Units vs Audio HAL? (newbie question)
- Subject: Re: Audio Units vs Audio HAL? (newbie question)
- From: David Duncan <email@hidden>
- Date: Fri, 7 Mar 2003 10:04:01 -0500
On Friday, March 7, 2003, at 09:43 AM, Frangois Menu wrote:
I want to output (computed) audio to the default audio device, but
it's not clear for me wether I should use the Audio HAL or an Audio
Unit.
With Audio HAL I can get the default output device and the properties
of the output device, then add an IO Proc for the device and start it
playing. But, as I understand it, I'll have to provide my audio
samples in the output format, at the required sample rate, and keep
track of the current audio device (if the user change it in the system
prefs, or unplug it).
Using the default ouptut Audio Unit (by calling
OpenDefaultAudioOutput), I set the input callback for this Audio Unit,
and start it playing. It's rather similar to using Audio HAL, but the
default ouptut Audio Unit will keep track for me of any change in the
hardware audio configuration (and adapt to the new congiguration),
without my code having to deal with this issues?
Yes, the DefaultOutput audio unit will do all the housekeeping for you,
so it is easiest to use it. If you would prefer AudioUnit V2 semantics
however, you will need to load the DefaultAudioUnit directly via the
Component Manager, OpenDefaultAudioOutput() has been deprecated (since
it can only open the V1 version).
--
Reality is what, when you stop believing in it, doesn't go away.
Failure is not an option. It is a privilege reserved for those who try.
David Duncan
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