[wdmaudiodev] CMiniportWaveCyclicStreamMSVAD::CopyTo

  • From: Jonah Albertson <jonahalbertson@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 24 Feb 2010 11:28:38 -0800 (PST)

I'm trying to modify MSVAD to make a specialized driver.  I'm having a bit of a 
problem with the timing of CopyTo.  Inside CopyTo if I count the data delivered 
it seems a bit slow.  If I do something like:

CMiniportWaveCyclicStreamMSVAD::CopyTo(    IN  PVOID                   
    IN  PVOID                   Source,    IN  ULONG                   ByteCount

        g_Total += ByteCount;

and track g_Total I find that the data is being delivered at about 40,000 
samples per second, but the format suggests it should get there at 44100.

If I allow the data to write to a file as in the sample, the file sounds fine.  

Is there anything that will slow CopyTo down?  Is the data being compressed 




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