[wdmaudiodev] Re: AVStream Mixer Problems
- From: "John D. Farmer" <johndfarmer@xxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 20 Aug 2004 11:27:09 -0700
I've tried a number of different topologies, as I mentioned before I looked at
the topologies of other soundcards and this seems to be the most correct:
static
KSTOPOLOGY_CONNECTION MiniportConnections[] =
{ //FromNode------------------FromPin-----ToNode----------------------ToPin
{ KSFILTER_NODE, 1, KSNODE_SPEAKER_VOLUME, 1 },
{ KSNODE_SPEAKER_VOLUME, 0, KSNODE_SPEAKER_MUTE, 1 },
{ KSNODE_SPEAKER_MUTE, 0, KSNODE_ANALOG_OUT_SUM, 1 },
{ KSFILTER_NODE, 3, KSNODE_MICROPHONE_VOLUME, 1 },
{ KSNODE_MICROPHONE_VOLUME, 0, KSNODE_MICROPHONE_MUTE, 1 },
{ KSNODE_MICROPHONE_MUTE, 0, KSNODE_ANALOG_OUT_SUM, 2 },
{ KSNODE_ANALOG_OUT_SUM, 0, KSNODE_MASTER_VOLUME, 1 },
{ KSNODE_MASTER_VOLUME, 0, KSNODE_MASTER_MUTE, 1 },
{ KSNODE_MASTER_MUTE, 0, KSFILTER_NODE, 0 }
};
and looks something like this in KS Studio:
===================================
1 0-|| Vol -> Mute \ / - || - {} 0
3 -{} || Vol -> Mute -- Sum -> Volume -> Mute/ || -o 2
===================================
----- Original Message -----
From: DJ Sisolak
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Friday, August 20, 2004 11:12 AM
Subject: [wdmaudiodev] Re: AVStream Mixer Problems
Hello John,
I am guessing the problem you are seeing is due to the placement of the SUM
node in your topology. When the topology parser in wdmaud sees this node it
assumes there is some sort of branching going on and looks downstream for
master controls. Thus if your Volume and mute controls are upstream fro this
node they would not be considered the master.
What is the exact topology you are describing?
Thanks,
DJ Sisolak
Microsoft Corp.
This posting is provided "AS IS" with no warranties, and confers no rights.
------------------------------------------------------------------------------
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of John D. Farmer
Sent: Friday, August 20, 2004 9:47 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] AVStream Mixer Problems
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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