[wdmaudiodev] DirectKS not working properly on XP with an USB device
- From: Maciej Cieślak <m.cieslak@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 25 Jun 2010 17:44:55 +0200
Hello,
I am developing an application that plays audio on an USB device using
Kernel Streaming. This program is designed to work with one specific
device.
When I am using the DirectKS sample (slightly modified to pick the
right device) on Vista or 7, everything works properly. However, on XP
I experience some serious problems: the packets are returned not in
order and irregularly. Other devices (such as standard sound card)
work perfectly with DirectKS on the same system.
The problem is very interesting for me, because KS is supported in
Windows XP and not supported in Vista and above, and I experience
something completely opposite.
I have contacted the device manufacturer asking whether this can be
caused by the device driver, and I got the answer "we always relied on
the generic Windows drivers" and he advised me to post to this
newsgroup.
Does anybody have an idea what might be causing this behavior?
Best regards,
Maciej
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