[wdmaudiodev] Re: PC Audio Capture

  • From: Sushma <sushma.yella@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 11 Jan 2010 19:33:42 +0530

Hi Tim,

I'm pretty new to kernel streaming. I see a lot of IOCTL_KS_*
properties but i do not think i need to handle all. Can i find some
info for which properties i need to look into.

Also, one of my question is still unanswered. Can i implement a common
solution for XP/Vista/Wn 7.

I had run the total recorder application. The total recording
application installs a audio class upper filter for XP and Vista. How
is this possible in Vista when app is directly writing to DMA buffer?

On Fri, Jan 8, 2010 at 11:37 PM, Tim Roberts <timr@xxxxxxxxx> wrote:
> Sushma wrote:
> Pre-Vista, it is possible to insert an audio class upper filter to
> intercept the kernel streaming ioctls.  It is surprisingly difficult in
> that situation to figure out what format the audio is in every case, so
> plan some frustrating test time.
> If the implement a audio class upper filter, what IRPs i need to look
> out for capturing the data.
> All kernel streaming transactions take place in internal ioctls,
> IRP_MJ_INTERNAL_DEVICE_CONTROL.  Data gets transferred with
> IOCTL_KS_READ_STREAM and IOCTL_KS_WRITE_STREAM.  You'll also need to monitor
> the property exchanges through IOCTL_KS_PROPERTY.  There are a lot of
> properties being exchanged.
> If you don't have kernel streaming experience, you have a LOT of reading to
> do.
> --
> Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.

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