[wdmaudiodev] Some problems about audio filter

  • From: JF Li <east11210@xxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 14 Mar 2005 22:02:48 +0800 (CST)

    Hi everybody!
    I am developing an upper class audio filter, in order to add some effects 
on the audio stream, but some problems confused me.
  1. If there are more than one soundcards installed in the system, in the 
process of IOCTL_KS_WRITE_STREAM or IOCTL_KS_PROPERTY, how can I detect which 
soundcard the data is being sent to?
  2. I have tracked the KSPROPERTY_CONNECTION_DATAFORMAT, but found something 
     A. The wBitsPerSample will always be 16, no matter what I have set in the 
     B. I can't receive the message when the nSamplesPerSec have been set to 
44100. And if I use directx as the output in player, I can receive the message, 
but nSamplesPerSec=100.
    Is there anyone can help me solve these problems?

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