Re: Setting the volume of an Audio Unit
Re: Setting the volume of an Audio Unit
- Subject: Re: Setting the volume of an Audio Unit
- From: David Duncan <email@hidden>
- Date: Tue, 7 Nov 2006 06:36:15 -0800
On Nov 7, 2006, at 05:29 AM, Kevin Brown wrote:
But when I called audioDeviceHasVolumeControl
(defaultOutputDeviceID, 0) I always got false, which makes no sense
to me, because obviously the default output device has adjustable
volume.
Having adjustable volume, and having a volume control are two
entirely separate things. Many controls on audio hardware are
optional, if only because they can be simulated in software. A volume
control is one of them.
What I really want to do is to have just my application's volume
controllable from my preferences window without interfering with
the system volume (ala iTunes, Adium etc). How do I go about this?
I presume you want to change the final mixed output volume on your
Audio output audio unit? Here is the magic incantation:
AudioUnitSetParameter(outputAU, kHALOutputParam_Volume,
kAudioUnitScope_Global, 0, volumeScaler, 0);
where volumeScaler is between 0.0 and 1.0 (inclusive) and outputAU is
your output audio unit.
--
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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