[wdmaudiodev] Re: Usb Audio Driver
- From: Tdtsai <tdtsai@xxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2003 19:09:15
Hi Bart
I don't find the DDK say we can't use PortCls to implement USB Audio Driver.
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.
BR,
Tzung-Dar Tsai
>According to Microsoft you are not supposed to >use the PortCls for USB
devices.
>The DDK says you should comply with the USB >sound spec. so Windows will
use its
>internal drivers. The fact that this results in >a high latency (Kmixer)
which
>makes the device unusable is not an issue for MS.
>The only 'proper' way would be to write you're >own KS driver, which is a
lot
>of work.
>
>Regards,
> Bart
>******************
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