Re: USB Audio Device. What Kind of driver I need to write?

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From: David (a_at_a.a)
Date: 08/10/04

  • Next message: Robin: "Re: USBSER.sys: error when re-plugging" 
    Date: Tue, 10 Aug 2004 16:06:14 +0800

    Tim Roberts wrote:
    > David <a@a.a> wrote:
    >
    >> I got an USB Audio device from CMedia. I think it is conformed to
    >> USB Audio specification. If it plugs to a newly installed Windows XP.
    >>Windows could detect it and use generic USB Audio driver.
    >> If I install the driver provided by the vendor, more options(columns)
    >>are available in Control Panel>Sound>Audio>Volumn Control>Recording.
    >>For example, Stereo Mix column is added after installed the driver from
    >>the vendor.
    >> The problem is that I want more options like "mic+PC sound
    >>mix","mic+CD mix" etc. What kind of program or driver should I write?
    >>user-mode or kernel mode driver? mini-driver or filter driver?
    >
    >
    > This can be done with a lower filter to USBAUDIO.SYS that does nothing
    > other than supply a different set of interface descriptors. You don't need
    > to get involved in the streaming data at all.
    >
    > It's not rocket science, but there aren't any examples, so you'll have to
    > play trial-and-error. You'll also need a very complete understanding of
    > the descriptor stuff in the USB Audio spec.

    Thank you for your reply.
    But I am still not quite understand how will it works if adding lower
    filter under USBAUDIO.SYS. My ultimate goal is to let user have option
    to record mic+PC sound mix etc, in volume control in control panel. How
    such low level driver mix sound from low level hardware and high level
    windows sound?
    I'm sorry that I am new to driver development.
    Thanks for your kindly help.

    David

  • Next message: Robin: "Re: USBSER.sys: error when re-plugging"

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