• From: Mihaela Laura Dumitrache <mihaela@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 29 Aug 2007 11:36:09 +0300


I want to write a driver filter capable of trapping any kind of sound input
signal (from webcam microphone, from Line input or Microphone input of a sound
card) and capable of applying effect on the sound like Pitch, and any other
sound effects.

My problem is that I need this driver to be used on XP and Vista.

For USB Audio, the solution, I think, is to write a lower filter driver that
could intercept the streaming and applies the effects.  This solution can be
used for both systems: XP and Vista.
For USB Audio on XP, I saw that can be used GFX Filters as an alternatively

But for sound card there is any solution? What is your opinion? I looked a lot
for any documentation but found none about this part.

For Vista, I saw that the solution recommended is sAPOs, but for it there are
some samples on DDK and 2 docs on Microsoft site and that it is all, no more



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