[wdmaudiodev] Re: Kernel streaming question

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Tue, 23 Jun 2009 15:34:39 -0700

Pallavi Joshi wrote:
> I am using Microsoft's kernel sreaming sample code (DirectKS). I
> create a render as well as capture pin in my code. This works fine
> with my laptop's built in audio card. But when I use the same code
> with a USB audio card, the output audio is scratchy. Its like the
> audio quality is not good. You can still hear the song being played
> but it won't be clear....it is scratchy.

Assuming you don't have a mismatch in the data performance, this kind of
thing often means that the rendering device is starving.  How are you
feeding the data?  How much data, how large are the buffers, how are you
doing the timing?

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.


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