[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.
>
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.com/
Other related posts:
