Hi Mike:I believe if you use commerical USB ADC 2.0 driver, you can ask you
driver provider to support API you need to access extension unit for you.
Commerical UAC2 driver should can parse USB ADC 2.0 descriptor to report
Extension Unit as Device Specific Node, then you can access it thru APO's
endpoint property page or access it thru IKSControl directly. I think it is the
easy way to access Extension Unit from user mode.
BR,Tzung-Dar Tsai
寄件者： Mike Kemp <mjk@xxxxxxxxxxxx>
收件者： wdmaudiodev@xxxxxxxxxxxxx
寄件日期： 2016/7/16 (週六) 12:49 AM
主旨： [wdmaudiodev] Re: accessing audiocontrols on a UAC2 device on Windows
Sounds interesting and thanks to Matthew van Eerde for his link. Borge: This
does sound interesting - I think I had a quick look at that or something
similar before. It's true we are not happy with the commercial UAC2 drivers we
have looked at so far, though may be forced to go with one of them due to time
pressure. Even then a working experimental driver might be useful to resolve
some of the issues. I plan to spend some time next week researching options so
any info on the open source solution would be very interesting... Thanks for
these comments... Mike
----- Original Message ----- From: Børge Strand-Bergesen To:
wdmaudiodev@xxxxxxxxxxxxx Sent: Friday, July 15, 2016 5:34 PM Subject:
[wdmaudiodev] Re: accessing audiocontrols on a UAC2 device on Windows
Mike,
this is probably totally far-fetched. With the DAC I sell (www.henryaudio.com)
there is an open source UAC2 ASIO driver based on libusbk. It works well and
could maybe be a source of inspiration for what you are looking for. If you
want I can send you the gory details and pointers to the code in github.
Børge
On Fri, Jul 15, 2016 at 6:30 PM, Mike Kemp <mjk@xxxxxxxxxxxx> wrote:
Hi I am wondering if anyone can suggest where to look to find out how to
access audio controls on a UAC2 audio device on Windows? We have a UAC2
device that runs fine on Mac OSX using coreaudio and we can access extension
units on the device control endpoint using libusb to control various aspects of
our device. For PC use we intend to license a commercial UAC2 standard
Windows audio driver, and we have a couple of candidates for evaluation.
Although these allow audio workstations to use our device I want to make our
remote control application send and receive data to various extension units on
our hardware (via the control endpoint 0) the same as on Mac OSX. The
question is whether there is a standard API to access these controls that all
UAC2 drivers implement the same way, or whether this is likely to vary with
each driver implementation? If there is a standard that will allow me to open
the device control endpoint and exchange data, where might I look for that
information? I've tried googling it, but unfortunately results for UAC2 are
usually swamped with unrelated UAC issues which seem to be a hotter topic!
Thanks for any pointers.. Mike
