[wdmaudiodev] Re: AVStream mixer problems on XP

  • From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Fri, 6 Jun 2003 10:14:26 +1000


I vaguely recall something similar happening to me, and it was caused by an 
error in my topology descriptors that was ignored by Windows 2000 but upset XP. 
I can't remember now what the error was, but it was something stupid like a 
mismatched node number or something. Once I corrected that everything was fine.

Jeff Pages
Innes Corporation Pty Ltd
  ----- Original Message ----- 
  From: Harry Graham 
  To: 'wdmaudiodev@xxxxxxxxxxxxx' 
  Sent: Friday, June 06, 2003 5:08 AM
  Subject: [wdmaudiodev] AVStream mixer problems on XP



  I have created two AVStream filters, one for record, and the second for 
playback, each containing its' own mixer topology described by Node and 
Connections descriptors. SndVol32 displays the mixer lines and controls 
correctly on W2K (DirectX9), but fails to display correctly on XP (also 


  For the record filter, all the relevant controls are displayed, but all the 
volume controls are disabled.

  For the playback filter, the result is pretty much nonsense.  Lines are 
displayed that don't exist (CD and Unknown pin), and none of the analog lines 
(there are 4 of them) input to the summer are displayed.


  I have examined the sysaudio filters(KSCATEGORY_AUDIO_DEVICE) with KsStudio, 
and don't see any reason why SndVol32 fails to work on XP.  The sysaudio 
filters are slightly different on XP, due to the addition of DRM, AEC, etc., 
but the analog lines are identical in both XP and W2K.


  Does anyone know what could cause XP to behave so differently from W2K?






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