[wdmaudiodev] Re: usbaudio.sys
- From: "DJ Sisolak" <dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 24 Feb 2004 15:07:14 -0800
Hello Tim,
That is not necessarily true. First, usbaudio.sys stopped using the
stream class shell after Win2K in favor of the avstream driver shell.
That not withstanding, the interface to any one of the usbaudio drivers
is via ks whether it be the Stream.sys version of Win98 and Win2k or the
AVStream (ks.sys) version of those OSes since. I believe what Hannah is
trying to do (and Hannah, please correct me if I am wrong) is to open
the USBAudio driver in the video driver to facilitate A/V sync. However
I do not see how this would be easier than doing it at the app level.
The requests are generally the same either way.
Thanks,
DJ Sisolak
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no
rights.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Tuesday, February 24, 2004 12:28 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: usbaudio.sys
Hannah W wrote:
>Hi DJ,
> I am not working with the app, but am working
>with the driver for our capture device and am only
>using graphedit. This is a video camera and when I use
>Microsoft's avmux and then file writer to create a
>avi file, the video and audio are not in sync.
> Can I create a audio capture pin in my avstream
>driver and in the Process routine use ZwCreateFile to
>get audio stream from usbaudio.sys? Will this be
>possible?
>
>
No. The basic problem is that the interfaces don't match up. The top
side of USBAUDIO.SYS speaks directly to the bottom side of STREAM.SYS,
and their communication is all in the form of SRBs. You don't want to
have to impersonate STREAM.SYS.
If you want to handle the audio stream yourself, you are going to have
to skip USBAUDIO.SYS and talk directly to USBD. That way you can access
the stream, but I suspect it's going to be a lot of trouble.
--
- Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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