[wdmaudiodev] Re: USB Audio Using Interrupt Transfers
- From: "vrf" <vrf@xxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 19 Jun 2003 10:19:40 +0800
Dear Udo,
Thank you! I will review your introduction.
I think I should prefer method one: write My USBAudio.sys。
I need 64kbps audio data transfer.
Are you sure that interrupt Transfers can implement Isochronous Transfers？
I worry about it because I don't know if the priority of interrupt transfer
is lower than isochronous transfer in streaming driver when the driver talks
to usb device.
I am not sure if the steam implementd by this way could be "like"
isochronous? :-)
Any advices are appreciated!
Best Regards!
vrf
----- Original Message -----
From: "Udo Eberhardt" <Udo.Eb@xxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Wednesday, June 18, 2003 11:58 PM
Subject: [wdmaudiodev] Re: USB Audio Using Interrupt Transfers
> You have to write a kernel streaming driver that talks to your device in
> the way your device supports it.
> For an introduction you can refer to
> https://www.microsoft.com/whdc/hwdev/tech/audio/wdmaudio.mspx
>
> Udo Eberhardt
> Thesycon GmbH
>
>
> vrf wrote:
> > Dear all,
> >
> > I have a motorola usb module (MC68HC908JB8/MC68HC08JB8/MC68HC08JT8-Rev.
> > 2.0).
> > Now I need to develop a USB Audio device using it. And the device should
> > be able to be used by Windows Sound Recorder or NetMeeting as a system
> > sound device.
> > As you know, it only supports interrupt transfers. And it has 3
> > endpoints including control endpoint. Endpoint 1 just has input
> > direction through which I need to implement a keyboard. Thus ep2 is the
> > only choice to transfer audio data. How could I implement my project?
> >
> > I think there may be two methods:
> >
> > Method One:
> > Describe USB as Audio using interrupt transfers
> > then, on Host side
> > CreateFile(Open Device)----->My USBAudio.sys
> > Method two:
> > Describe USB as Audio with Isochronous transfers
> > then, on Host side
> > CreateFile -----> USBAudio.sys (generic driver supplied by
> > Microsoft) -----> My Filter Driver
> > Which solution is good, or there is another better one?
> >
> > Any advices are very appreciated!
> >
> > Best Regards!
> >
> > vrf
> > 2003-06-17
>
>
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