Re: Audio Output Units and Volume
Re: Audio Output Units and Volume
- Subject: Re: Audio Output Units and Volume
- From: Jeff Moore <email@hidden>
- Date: Thu, 6 Jan 2005 15:52:31 -0800
Not all output units support volume control. AUHAL certainly does
though. It supports it in two ways. First, it will pass any requests
for HAL properties, such as kAudioDevicePropertyVolumeScalar, on to the
HAL. This gives you access to the hardware volume (and other) controls.
AUHAL also supports the parameter, kHALOutputParam_Volume, which
provides you with a software volume control that will scale the volume
of all the data going out.
On Jan 6, 2005, at 3:40 PM, Dominic Feira wrote:
It seems that some Audio Output Units do NOT support volume control at
all. In particular, I am working on getting some things to work with
a MOTU 828mkII.
If I wish to be able to control the volume on a per application basis
with this device (that doesn't support volume control) do I need to
use another audio unit in addition to the output unit?
My guess is that I need to do so because the Audio Unit is
representing the device as it is and not adding any additional
functionality to it.
Dominic Feira / Code Monkey / Ambrosia Software, Inc.
--
Jeff Moore
Core Audio
Apple
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