[wdmaudiodev] Re: Usb Audio Driver
- From: "Jerry Evans" <jerry@xxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2003 20:19:41 +0100
Hi DJ
Thanks.
> 1) Not sure what you are after. Being that the driver is KS based, it is
> impossible to get away from the KS style ...
Apologies. I'm not sure of the division of responsibilities here :-))
How about this:
HANDLE handle = OpenFile(\\.\\usbgadget")
WriteFile(...)
OLVERLAPPED ol
ReadFile(...,&ol);
i.e. now the device can be treated as a file and as it will do overlapped IO
might actually be rather efficient. It would certainly *enormously* simplify
non-time critical transfers. This gets well away from the (IMHO) overly
complex filter graph stuff.
> There is the mixer API to address any audio device, though I
> can see where that might fall short for addressing all possible
> properties.
Interesting. Can you elucidate ?
> 2) I will make measurements on the driver and stack once the new driver
> is complete.
Sounds good.
> 3) The USB Audio specification allows for a "SET_MEM" and "GET_MEM"
> request to the device.
In principle it sounds good. What would the API be ? Do I have to go thru
all the Pin stuff ? Could I go a DeviceIOControl(SET_MEM) if you see what I
mean ?
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