[wdmaudiodev] Re: USBAudio.sys filter driver?
- From: BlazeAudio Developer <developer@xxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 27 May 2003 10:33:08 -0700
Alternatively, you can write a Stream class minidriver (or AVStream) driver
- which would essentially replace the functionality provided by
USBAudio.sys.From what I understand that would be much easier than trying to
write a filter driver!
Thanks.
Devendra.
At 01:10 AM 5/27/2003, Olivier Roblin wrote:
It's always possible to write a Port Cls driver for Audio-USB device. We
have already spoken about this a few weeks ago in the mailing list.
Maybe can you find archives?
Anyway, you have to create URB &IRP in the MiniportStream object and send
them down to the driver stack (USBD). Not easy, but possible.
Olivier
----- Original Message -----
From: "Akos Horvath" <akos@xxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Monday, May 26, 2003 6:03 PM
Subject: [wdmaudiodev] USBAudio.sys filter driver?
>
>Hello all,
>
>I have a USB microphone that does not conform to the USB Audio 1.0 spec,
so
>USBAudio.sys provided by Microsoft does not work with it. Although the
>logical solution would be to make the device USB Audio 1.0 compliant, I
have
>to find a software workaround. I need to find a way to write a driver for
>this device, but I have only had experience writing port class drivers.
MSDN
>states that port class drivers cannot support external buses such as USB,
>and they also seem to suggest there is no space for a vendor supplied
>component in between the USB device and USBAudio.sys (see
>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/stream/hh/s[1]
>tream/pcdesign_9y1z.asp )
>
>So my question is, can I put some sort of filter driver between USBD.sys
and
>USBAudio.sys? If so, do I need to do anything special to get Windows to
>actually try and use USBAudio.sys with this non-compliant device? If not,
>does anyone have any suggestions on how I can try and create a driver for
>this device?
>
>Thanks,
>
>-Akos Horvath
>
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