[wdmaudiodev] Stereo/mono settings of a topology node

From: Henky GUNAWAN <henky_gunawan@xxxxxxxxxxxxxxxx>
To: wdmaudiodev@xxxxxxxxxxxxx
Date: Thu, 20 Oct 2005 10:56:30 +0800

I tested the AC'97 sample driver found in the DDK and I found out that the
some of the topology nodes are said to be mono while others are stereo.
What I failed to understand is how a certain node can have different
mono/stereo settings even though they are using the same automation table
with the same PCPROPERTY_ITEM.

One example I noticed is that the CD Mute node is considered to be stereo
while the rest of the mute nodes are mono.  This translates to having the
mute property handler receiving only left channel mute controls for most of
the mute nodes, except for CD mute node, for which it receives mute
controls for both left and right channels.

Under normal usage, the handler can just easily fail the right mute
controls, but the driver could not pass HCT with such an approach. I could
always hack it so that right mute controls are treated as left control and
return an STATUS_SUCCESS, but I am still hoping that there is a way to set
the CD mute node to be recognized as a mono node instead. Have I missed an
important portion of the driver code that defines the mono/stereo
properties of the topology nodes?

Thanks,
Henky

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[wdmaudiodev] Stereo/mono settings of a topology node

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