[wdmaudiodev] Re: Loopback capture

  • From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Mon, 24 Mar 2014 16:22:52 +0000

Can you run DxDiag, "Save All Information", and send me the results off-list?

From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of ambrish dantrey
Sent: Friday, March 21, 2014 3:27 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Loopback capture

Got it. It is a bug in Microsoft API:


Is there a KB article on it? This should atleast be mentioned on MSDN page for 
loopback recording.


On Fri, Mar 21, 2014 at 6:19 PM, ambrish dantrey 
<a4ambrish@xxxxxxxxx<mailto:a4ambrish@xxxxxxxxx>> wrote:
Adding a subject

On Fri, Mar 21, 2014 at 6:18 PM, ambrish dantrey 
<a4ambrish@xxxxxxxxx<mailto:a4ambrish@xxxxxxxxx>> wrote:

I am running into some very strange issue with loopback capture

1) Open a loopback capture stream on default audio endpoint (headphones)

2) Play audio using WMP. This audio gets captured in loopback stream

3) Terminate audio playback using ctrl+w shortcut.

At this stage, you'll get a buzzing sound from my headphones.

This buzzing sound will go away only after I terminate loopback capture.

Does anyone have any idea on how loopback capture can affect audio going out on 
the device?

I am using sample code at and modified it to not stop capture when flags are 



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