[wdmaudiodev] Re: Loopback capture

  • From: ambrish dantrey <a4ambrish@xxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Sat, 22 Mar 2014 03:56:54 +0530

Got it. It is a bug in Microsoft API:

http://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/c7ba0a04-46ce-43ff-ad15-ce8932c00171/loopback-recording-causes-digital-stuttering?forum=windowspro-audiodevelopment

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

Thanks,
Ambrish


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

> Adding a subject
>
>
> On Fri, Mar 21, 2014 at 6:18 PM, ambrish dantrey <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 non-zero.
>>
>>
>> http://blogs.msdn.com/b/matthew_van_eerde/archive/2008/12/16/sample-wasapi-loopback-capture-record-what-you-hear.aspx
>>
>> Thanks
>>
>>
>>
>>
>
>

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