[wdmaudiodev] Re: Setting KSPROPERTY_AUDIO_VOLUMELEVEL
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 24 Jun 2011 17:37:57 +0000
If the device does not expose volume properties, Windows will step in and add a
-192 dB to X dB software volume control, which defaults to a high gain; this
causes clipping.
A workaround is to expose a volume property with a very narrow range that does
not actually impact the signal.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Friday, June 24, 2011 10:31 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Setting KSPROPERTY_AUDIO_VOLUMELEVEL
Neetu Sand wrote:
>
> Our driver is based on wavecyclic miniport. It exposes a speaker and
> MIC. We are seeing that on Windows 7, MIC volume has a 30dB gain with
> a volume slider range -192 dB to 30 dB. Our device does not have a
> volume knob but we want to change the volume slider range to -192 dB
> to 0 dB or at least be able to set volume to 3dB for MIC. That way we
> can get rid of extra gain. That's why I have implemented topology
> filter and implemented property handler.
If your device does not have adjustable volume, then you should not be exposing
any volume properties at all, and there should not be a volume control in the
control panel.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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