[wdmaudiodev] Re: UAC2 volume multiple range control

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 5 Dec 2018 12:57:04 -0800

Kevin Ng wrote:

Hi, I am new here. Tried searching through the list and unable to find some similar to the above.
So I am trying to specify a multiple volume range control with different volume resolution for each volume range.
I understand what is required to send back the feature unit volume range request command from the host PC (Windows 10/MacOS). But the problem is the host PC only allow 8 bytes of data length to be sent back for the volume range command. Anyone have any idea how to implement this?

Interesting.  I would expect it to make one request of 8 bytes, then make another request based on the wNumSubRanges you returned.  That's the usual protocol for variable-length layouts. Do you not see the second request?

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.


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