[wdmaudiodev] Re: External clock synchronization and sample rate issue

  • From: uwe kirst <u.kirst@xxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 19 Mar 2007 10:56:50 +0100

Hakon Strande wrote:

The bug "Need a way for a device to advertise realtime format caps changes" is 
currently not a Windows OS Bug since the feature is part of the ongoing feature 
planning/prioritization process for the next version of Windows and given the ability for 
3rd parties to work around this in the driver:

"Custom audio driver implements a different PnP device interface for each of the 
possible formats."

I know other solutions, which of course also has it's disavantages:

-as a driver writer you could write a old style mme-driver (example included in the NT4 DDK). Disadvantage: does not seem to be supported in 64-bit operating systems. The mme driver was also a solution to some known XP/W2k Bugs, which some of you may remember:
   -audio data was shifted by one bit in W2k by the kernel mixer
   -kernel mixer additional latency
   -24 / 32 bit format support was removed in XP
   -32 device limit in XP
   -unexpected sample rate conversations in W2k/XP

-as a writer of audio applications you could use directKS (like sonar does)
-or use ASIO instead of Microsoft



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