[wdmaudiodev] Re: Usb Audio Driver
- From: "Jerry Evans" <jerry@xxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2003 19:09:13 +0100
Hi DJ
1) An easy to access user mode interface i.e. KS style without the pain.
2) Some kind of gold standard for latency etc. Given that firmware people
have to guarantee the timely arrival of data it seems a shame to have loads
of latency in the stack
3) Support for firmware downloading via the USB stack, again with a user
mode interface. We've got stuff based on both TI and Cypress parts and this
facility would make life very much simpler
If you want any more detail please holler.
Jerry
----- Original Message -----
From: "DJ Sisolak" <dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Wednesday, July 16, 2003 6:50 PM
Subject: [wdmaudiodev] Re: Usb Audio Driver
> Hello all,
>
> I know I am asking for trouble here :-) but what is it in the
> USBAudio.sys driver or the USB Audio standards that does not serve your
> needs? Why do you find it necessary to create your own drivers? The
> reason I ask is that we are in the process of updating both the driver
> and the specifications.
>
> Thanks,
> DJ Sisolak
> Microsoft Corp.
>
> 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
> bart@xxxxxxxxxxxxx
> Sent: Wednesday, July 16, 2003 6:24 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: Usb Audio Driver
>
> Hi,
>
> > I don't find the DDK say we can't use PortCls to implement USB Audio
> Driver.
> >
> You can do it, I also did :)
>
> > DDK say "The PortCls framework might also be useful for constructing
> drivers
> > for audio device on other hardware buses or for software only
> device.". So
> > PortCls may not wrong way to implement USB Audio Driver.
> >
> Somewhere else in the DDK it says that for USB sound devices you should
> use a
> standard USB device structure. If you doing it another way, you don't
> get any
> examples from MS. I needed some ugly hacking to get it done anyway.
>
> Regards,
> Bart
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