[wdmaudiodev] Re: Processing volume/mute query requests with Channel = -1
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 19 Jul 2012 15:17:17 +0000
This is the "master mute" or "master volume".
For "mute", return 1 if all channels are muted and return 0 if any channel is
unmuted.
For "volume", return the value of the "loudest" channel volume (that is, the
max volume across all channels.)
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Eugene Muzychenko
Sent: Thursday, July 19, 2012 8:08 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Processing volume/mute query requests with Channel = -1
Hello!
Testing my driver with KS Studio, I noticed when KS Studio instantiates my
topology filter, it sends KSPROPERTY_AUDIO_MUTE and
KSPROPERTY_AUDIO_VOLUMELEVEL with KSPROPERTY_TYPE_GET flag and Channel equal to
-1. My driver processes only "set" requests with such channel value, as
suggested in MSDN for KSNODEPROPERTY_AUDIO_CHANNEL so it return error for these
requests. KS Studio interprets this driver behavior as incorrect, displaying
error message in orange.
I searched MSDN and MS site for explanation but found no informative
description. Looked onto AC97 driver example and found the CHAN_MASTER
definition equal to -1 but could not understand clearly how it is used. Looked
onto MSVAD, it defines this macro too but never uses it and does not check
Channel value in its propery handlers.
How to process these requests? Is there an informative description in MS
documents?
Regards,
Eugene
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