[wdmaudiodev] 88.2 kHz support under Vista

  • From: "Philip Lukidis" <plukidis@xxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Fri, 16 Feb 2007 14:09:16 -0500


One of our audio devices under Vista has an issue with 88.2k sample rate.  My 
device can be "locked" at any one of my supported sample rates (32k, 44.1k, 
48k, 88.2k, and 96k) in my CPL via dynamic audio subdevices.  My dynamic audio 
subdevices seems to work fine.

When my device is locked at 88.2k, it seems that my DataRangeIntersection 
handler never gets called more than once when I try to open the speaker 
configuration page in the MS audio CPL for my device, and during this call it 
returns a perfectly fine intersection.  A new stream is started successfully, 
and then destroyed, but my DataRangeIntersection handler is never called again. 
 Therefore no speaker configurations are displayed at this sample rate (I lock 
the device at a specific sample rate in my control panel using dynamic audio 

This only happens with a 88.2k sample rate; 32k, 44.1k, 48k, and 96k work fine. 
 With these last sample rates, I'm called with varying audio data ranges, and 
everything works fine in that all my supported speaker configurations are 
displayed.  One more bit of detail; when I try to force my 
DataRangeIntersection handler to return 16 bit support, all supported sample 
rates except 88.2k are forced to 16 bits, but 88.2k is somehow forced to 24 
bits (as it *always* is, even my I perform good intersections at 16 bits and 24 
bits, and this is unique to 88.2k), despite the fact that I don't return 
support for it.

Does anyone have any idea what is going on here, and why my 
DataRangeIntersection handler is only called once just for this sample rate 
when I open the MS audio CPL speaker configuration page?


Philip Lukidis 

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  • » [wdmaudiodev] 88.2 kHz support under Vista