Re: non-standard IOAudioControl
Re: non-standard IOAudioControl
- Subject: Re: non-standard IOAudioControl
- From: Jeff Moore <email@hidden>
- Date: Wed, 20 Oct 2004 13:18:42 -0700
A driver can provide a property plug-in that the HAL will load and
filter most property requests through. The API for the plug-in is in
<CoreAudio/AudioDriverPlugIn.h> and the driver provides the location of
the plug-in to the HAL by setting the kIOAudioEngineCoreAudioPlugInKey
to a value that is a path relative to /System/Library/Extensions.
Doing this makes custom controls available to apps through the usual
property mechanisms of the HAL.
On Oct 20, 2004, at 7:13 AM, nick wrote:
Is it possible to create a non-standard IOAudioControl in a driver and
access it from user space?
From what I can see AudioDeviceGet/SetParameter doesn't allow doing
this, only allowing access to the standard volume/input select
IOAudioControls predefined in AudioHardware.h.
Would it be possible to access an IOAudioControl directly through the
I/O Registry? If so is there any documentation for this?
Regards,
Nick
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--
Jeff Moore
Core Audio
Apple
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