I am developing a virtual sound driver (WDM). My driver will be used as default audio device and I would like to redirect some requests to a real sound card. For this purpose I've planned to use direct irtual sound driver (direct calls to another dr

I am developing a virtual sound driver (WDM). My driver will be used as
default audio device and I would like to redirect some requests to a real
sound card. For this purpose I've planned to use direct calls to the
existing sound driver but I could not find a way to enumerate sound drivers
from the kernel mode. I don't want to use user space code for these
purposes. Is there other way to make direct calls to another sound driver?



Probably it would be better to create filter device driver for existing
sound card. Since the audio drivers develop as miniport driver I worry about
the possibility of such things. What do you think?

> I am developing a virtual sound driver (WDM). My driver will be used as
> default audio device and I would like to redirect some requests to a real
> sound card. For this purpose I've planned to use direct calls to the
> existing sound driver but I could not find a way to enumerate sound
drivers
> from the kernel mode. I don't want to use user space code for these
> purposes. Is there other way to make direct calls to another sound driver?

IoGetDeviceInterfaces with one of those KSCATEGORY_*.
KSCATEGORY_AUDIO should work, I suppose.


> Probably it would be better to create filter device driver for existing
> sound card. Since the audio drivers develop as miniport driver I worry
about
> the possibility of such things. What do you think?

No, it won't be better.
A filter for KS based device is incredibly difficult to get working
reasonably well and absolutely impossible to get perfect.
A communication between user land and KS is undocumented and subject to
change at any time.

-- Max.