[wdmaudiodev] Re: USBAudio.sys filter driver?
- From: "Olivier Roblin" <oroblin@xxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 27 May 2003 10:10:20 +0200
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
> 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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