[wdmaudiodev] Re: Setting KSPROPERTY_AUDIO_VOLUMELEVEL
- From: Neetu Sand <neetu.freelist@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 24 Jun 2011 14:00:27 +0530
Hi Tim,
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.
Thanks for your help.
cheers,
Neetu
On Thu, Jun 23, 2011 at 10:12 PM, Tim Roberts <timr@xxxxxxxxx> wrote:
> Neetu Sand wrote:
> >
> > I am trying to set volume level from driver. Please note my device
> > does not have any volume knob. We want the driver to set volume range
> > between -96 dB - 0 dB. I have implemented topology filter which has a
> > volume node. Volume node is publishing KSPROPERTY_AUDIO_VOLUMELEVEL.
> > Property handler is handling all requests - KSPROPERTY_TYPE_GET,
> > KSPROPERTY_TYPE_SET and KSPROPERTY_TYPE_BASICSUPPORT.
> >
> > I see that volume slider shows the range that I set but there is no
> > audible change. It just the same, no matter how much level is
> > displayed on slider.
>
> I'm confused by your description. When you say "my device does not have
> any volume knob", do you mean that the volume in your device is not
> adjustable? If so, what on earth are you doing in your property
> handlers? When you offer to support KSPROPERTY_AUDIO_VOLUMELEVEL, you
> are telling the system "my device has adjustable volume". It sends you
> a SET request with the new volume level, and expects you to adjust your
> device to handle the new attenuation level.
>
> When you say, "I am trying to set volume level from driver", what driver
> do you mean?
>
> Are you expecting the audio system to adjust the volume for you, by
> scaling the data values? It doesn't work that way.
>
> --
> Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.
>
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