[wdmaudiodev] Re: Microphone Virtual Driver
- From: Shree Kumar <shree@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 24 Sep 2003 17:35:39 +0530
Hi,
Thanks a lot, Scott! Your pointers to specific files
helped me the most.
I had also seen the msvad directory and had seen some of
it, but I somehow ended up thinking that it was not what
I needed.
I compiled and installed the MSVAD's simple driver(in Windows
Server 2003). There is a bug in that driver, but since the
code is illustrative only, I am not going to bother.
However, one problem that I am facing is that the driver is
not enumerated in a terminal services session. I use
waveOutGetDevCaps() to enumerate the audio playback devices.
Any idea what is going on ? (Note that this problem does
not appear when I login to the machine directly).
Regards,
Shree Kumar
Scott Lundgren wrote:
>
> Shree,
>
> Take a look at the MSVAD (Microsoft Virtual Audio Device) sample in recent
> releases of the DDK. It can be found at src\wdm\audio\msvad. In
> particular, take a look at savedata.cpp, basedma.cpp, and basewave.cpp.
>
> MSVAD is a virtual output device; it appears as a standard audio device to
> Windows applications. However, rather than talking with hardware, raw data
> is written to disk.
>
> The framework is in place (see CSaveData::CopyTo) to use this as an input
> (i.e. a microphone).
>
> The MSVAD.inf file is a good starting point for installation; it works as is
> in the DDK. Some pointers are included in readme.htm in the audio\msvad
> directory. You can point the Add New Hardware wizard to this inf, or you
> can use it as a baseline for the SetupDiXXX() WinAPIs. You'll probably want
> to add a hardware ID to the INF; see Chapter 15 in Walter Oney's
> _Programming the Microsoft Windows Driver Model_
>
> Scott
>
> >
> >Hi all,
> >
> >I need to write a virtual driver which acts like a microphone.
> >Something like daemon tools, but which provides a virtual
> >microphone.
> >
> >This is for providing interactive-input to an application
> >which uses audio input (I don't have any control
> >over the program & don't have it's source code), and provides
> >a selector for which device to use for input. So if my
> >driver appears in the list, I can get input from it.
> >
> >What sort of driver must I write?
> >How do I tell windows that the hardware is present when it is
> >actually not? Is it possible to load the driver before running
> >the application & unload it after the app exits?
> >Also, any idea how this driver can be loaded into a Terminal
> >Services session?
> >
> >My platform is Windows 2000 and above. I am a newbie to
> >driver development but have read some of the
> >DDK material.
> >
> >Any suggestions/hints/links will be much appreciated!
> >
> >Thanks in advance,
> >
> >- Shree Kumar
> >******************
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