[wdmaudiodev] Q? Audio Record-in or Line-In volume control in a Driver

  • From: "Yoon, Sam" <sam.yoon@xxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Thu, 7 Jul 2005 15:04:21 -0500


I made a filter driver and it will catch the audio data to do some audio
enhancements. Some reasons I need to control audio volume especially
Record-in and Line-in in Record side not in the play-out side. I figured
out that I can use KSPROPERTY and 

KSPROPERTY_AUDIO_VOLUME_LEVEL. But this one was for the master volume. 

I don t know how can I get/set the Mic-In and Line-In volume level. My
thinking was to parse the topology and get the node of Mic-In or
Line-in. but I don t know how. How can parse the topology in a driver? 

How can I get the node at a driver? If you have a simple example it
would be better.


Thank you.


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