[wdmaudiodev] 24bit WDM streaming

  • From: wdm <wdm@xxxxxxxxxxxxx>
  • To: "'wdmaudiodev@xxxxxxxxxxxxx'" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Tue, 28 Sep 2004 15:53:28 +0200

Hi everyone,

so far I have only streamed 16bit stuff over WDM-KS and
I now want to also support 24bit. If I have a KS-WDM-
device which tells me that it supports 24bit (only and
not 32bit), can I still stream 32bit values to the driver,
or do I need to pack stuff into 24bit units?

I would think, that if I use WAVEFORMATEXTENSIBLE
and set wValidBitsPerSample to 24, I should be
able to still stream 32bits to the device - or
have I got it wrong there?

Also - what about USB 1.1 devices? would the USBAUDIO.SYS
shrink the data to 24bit before transmission before it
is sent over the interface (this would obviously save
precious bandwitdth)

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