[wdmaudiodev] Re: Hi,

  • From: "Hakon Strande" <hakons@xxxxxxxxxxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Fri, 27 Jan 2006 10:34:32 -0800



We are not doing anything directly to break DirectKS in Vista although
we as you indicate did state in the past (when DirectKS was born) that
we did not guarantee that this model will be maintained for future OS. 


To update that disclaimer, DirectKS should still work in Vista with
appropriate audio driver models although I am not sure it makes sense to
use that model anymore since the Vista audio system is so much better
than past OS with regards to latency, thread priorities, etc. We feel
there is less need for audio content creation applications to bypass the
Vista audio subsystem than has ever been the case before but if
necessary there is a built in direct mode called Exclusive Mode that can
be utilized. If you really want to though, I believe DirectKS can still
offer that direct link as well. If you are a Vista Beta tester and find
that DirectKS apps do not work, PLEASE file bugs.




Hakon Strande

PM Integrated, Internal, External, and Wireless Audio Devices

MediaTech/DMD/Windows Client/Microsoft


From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jerry Evans
Sent: Friday, January 27, 2006 10:07 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Hi,


Hi Nugen


I'd qualify this by checking your latency requirements. If you need
latencies of less than 20ms or so then it going to be very hard to do
with the existing USB stack. 


It is also wrth mentioning that the KS interface is likely to be dropped
in Vista so the investment in time may be of limited value. Some of the
Microsoft people here may be able to comment on this.


A quick way to test latency and stability is to try ASIO4ALL
(www.asio4all.com). This is an ASIO interface to KS. You can then use an
ASIO compliant application like Cubase to test your hardware (or write
something using PortAudio or similiar)


Off the shelf USB drivers can be had here:
http://www.thesycon.de/eng/usbio.shtml (I am not affiliated BTW). I
believe that these will offer considerably better performance.







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