Re: Audio Controls
Re: Audio Controls
- Subject: Re: Audio Controls
- From: Jeff Moore <email@hidden>
- Date: Wed, 5 Feb 2003 17:36:28 -0800
The HAL and the Family only support one gain stage on a channel at the
moment. That's what the volume properties in the HAL API refer to.
There is also the concept of a master gain stage that is always channel
0 on the device.
On Wednesday, February 5, 2003, at 12:23 PM, Sean Morrell wrote:
I am writing a driver for a device that has several level controls for
each
channel. Creating the controls in the driver is working fine. At
least it
doesn't fail when I add them to the device. But from Daisy and AMS I
don't
see the controls. In fact, the typical volume slider for the volume
control
that I have added is not enabled. Thinking this might be an
application
presentation issue, I quickly browsed the CoreAudio HAL API. I found
property identifiers for volume, mute and playback. But I don't see
how
information can be obtained regarding other controls of a device.
What am I
overlooking? Is there provision to have multiple level controls for
each
channel? What function and property ids are involved?
--
Jeff Moore
Core Audio
Apple
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