[wdmaudiodev] Re: Issues with MS AEC.

  • From: "Korolev, AlexeyX" <alexeyx.korolev@xxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <'wdmaudiodev@xxxxxxxxxxxxx'>
  • Date: Wed, 23 Jul 2003 18:25:05 +0400

Thank you very much for information.
One question:
What do you mean to ensure that no audio is being captured or played back when 
AEC is instantiated? Do you recommend to stop all audio processing or to wait 
until audio processing will finish.
Is it possible to stop all audio processing?
To: <wdmaudiodev@xxxxxxxxxxxxx> 
Subject: [wdmaudiodev] Re: Issues with MS AEC. 
From: "Martin Puryear" <martinp@xxxxxxxxxxxxxxxxxxxxx> 
Date: Tue, 22 Jul 2003 17:03:55 -0700 


This is unfortunately a known issue with the XP audio architecture.  The only 
"workaround" (not really a good one) is to ensure that no audio is being 
captured or played back when AEC is instantiated.  I realize this isn't a very 
satisfactory response.  We are addressing this in the next major version of 
Martin Puryear
Development Manager
Microsoft Windows Audio/Video Devices Group
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From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[ <mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> 
mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Korolev, AlexeyX
Sent: Tuesday, July 22, 2003 7:45 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Issues with MS AEC.
I'm writing full-duplex audio processing code. I've added MS AEC node to the 
driver stack. In most cases AEC is working fine. 
But, if user starts playing sound using Wave Out interfaces (for example using 
Windows Media Player) before our driver has inserted AEC to the driver stack, 
AEC doesn't work. I can't insert AEC node in topology when user-mode 
application is using Wave Out. 
Does anybody have information about it? Is there any known workaround for this 



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