[wdmaudiodev] AVStream Mixer Problems
- From: "John D. Farmer" <johndfarmer@xxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 20 Aug 2004 09:47:18 -0700
Greetings,
I'm creating a AVStream audio device that registers itself as a audio playback
device. When I select the device as my default playback device, I can hear the
sound and everything is fine and good. But now I am working on implementing
the audio mixer for the device (e.g. Volume, Mute, Microphone Volume, ect).
When I open up the Sounds and Audio Devices control panel, 'Device volume'
section is grayed out as well as the buttons in the 'Speaker settings' section
on the Volume tab. When I go to the Audio tab I can access the Volume and
Advanced buttons for both my Sound playback and Sound recording. If I choose
the Volume button for Sound playback, I see my Wave, CD Audio, and SW Synth
mixers, but I seem to lack the Master Volume mixer. If I go to the properties
in Sndvol32 for my device I see "Playback" and "Recording" radio buttons.
Under playback I see the same mixers as I saw previously, and under Recording I
see no volume controls.
I assume once I implement the Master Volume mixer that the controls on the
'Device volume' and 'Speaker settings' sections will be enabled. So how do I
implement the Master Volume mixer?
I've created a simple wave topology that implements Volume, Mute, SUM, ADC and
DAC nodes for my speaker and microphone pins. When I look in KS Studio I see
my driver under the KSCATEGORY_AUDIO Filter Factories as a Audio device (or a
\wave device). I looked at other soundcards on different systems and they also
seem to have a Mixer node (or a \topology device). I assume that these
soundcard drivers are portcls drivers. When I instantiate both of these
filters they automatically connect (I've seen this behavior before in the MSVAD
sample and understand the theory of how these filters work together). So is
there a way to create a Topology Filter and a Wave Filter for my device, or
does AVStream do it a different way. I see that portcls drivers uses
PcRegisterSubDevice to register these filters but I have been unable to find
the AVStream equivalent.
Any help would be greatly appreciated.
Regards,
John Farmer
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