[wdmaudiodev] Re: Dynamic format negotiation on Windows 7

  • From: uwekirst <u.kirst@xxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 10 Feb 2010 19:47:04 +0100

Hi Chen-mean Liu,

I have also tried to implement dynamic Format changes to my driver (it's wavecyclic though).
I wasn't 100% sucessful.
The basic issue was that after changing the format, the new format appeared in the ms win7 audio control panel, but the old format was not removed automatically.
The old one was still selected.
If I tried to test the two formats (old and new) it turned out that the old one does not work, but the new one works as expected. Because there seem to be still user interaction necessary (changing the selection from old to new format) I feel that this feature is not usefull.
Any ideas what am I missing?


Cheng-mean Liu (SOCCER) schrieb:
Hi Kishore:

 This is a whitepaper on " Windows 7 Changes Related to Audio Drivers", it has a section 
called "Dynamic Format Change Support", that has instructions on how to do it.
This whitepaper is in the final stage of getting published to WHDC site.

Here is the information I cut from the current state of this paper. Let me know 
if you have any question in implementing this feature.


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