[wdmaudiodev] Re: help on MSVAD
- From: Hakon Strande <hakons@xxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 30 Oct 2006 10:30:46 -0800
Dear Sir,
It is not recommended to build virtual drivers that covertly re-direct
audio streams from one logical device to another.
In Windows Vista we are trying to create complete audio path
transparency for the benefit of Windows Vista users and applications and
enable discoverability of the actual audio peripherals that are being
used for the benefit of the user, the current and future versions of the
Windows OS media policy engine and to enable more powerful and flexible
Windows application experiences.
If you hide the true nature of where the audio stream is going you are
working against this initiative and while it may be technically possible
we can't help you do this, there is no Designed for Windows Logo for
such a driver and the audio system and audio device infrastructure may
change in ways that could break your virtual driver at any time with any
QFE or Service Pack.
In this case it is better to allow the user to select the device to be
used with the VOIP application using the application UI or allow the
application setup wizard to help the user through this selection
process. This way the application is aware of the device used, the user
can use many different logical devices with different applications for
different purposes (if needed) and furthermore it is absolutely
necessary for the application to know what device it is dealing with to
enable the right application graph processing algorithms based on the
nature of the logical device, such as for Mic Arrays for instance.
Sincerely,
Hakon Strande
PM Integrated, Internal, External, and Wireless Audio Devices
MediaTech/DMD/Windows Client/Microsoft
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Arijit Paul
Sent: Saturday, October 28, 2006 11:28 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] help on MSVAD
Hi,
I have done lots of ground work, but could not find any satisfactory
explanation on this. My requirement is like that - i will have an
pseudo audio driver registered. For one of my application (voice chat
application), I will select this driver for audio i/p and o/p.
Application will deliver any incoming voice to the pseudo driver for
audio o/p (in normal case, it would have been given to the sound card
driver in the system). The pseudo audio driver will forward this voice
to somewhere else(lets say X). The pseudo audio driver will get user
voice i/p from X and forward it to the voice chat application (in that
case X is acting as a microphone source).
Initially I was thinking it won't be possible in windows. Then I came
across MSVDM where they have written a driver for storing voice to a
file instead of o/p it to sound card. I was thinking to tweak this for
my purpose. Will it be possible to make this work for our requirement?
Also, I heard a lot about kernel streaming. Do I need to devlop any
expertise on that too.
It will be helpful if you can tell me what are the things I need to
know to develop this driver. I have never worked on audio driver in
windows. Also, I heard there are some bugs in MSVAD which have been
fixed. Do you have any pointers on that?
An early reply will be very much appreciated.
Any pointers or help in this regard will be highly appreciated.
-paul
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