Hi - thanks for the ongoing suggestions.
I'm waiting for our driver supplier to provide details of the API they expose
for audio control functions to see if that's sufficient or if I need to look
further.
Just to clarify, by "you can access it thru APO's endpoint property page or
access it thru IKSControl directly" do you mean that these are two driver
independent way of accessing the audio control endpoint? I am new to those
access methods but can research them. Or if you have any suggested references I
can look at, that would be helpful.
All the best
Mike
----- Original Message -----
From: Tsai Tzung-Dar (Redacted sender "tdtsai1973" for DMARC)
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Monday, July 18, 2016 4:15 AM
Subject: [wdmaudiodev] Re: accessing audiocontrols on a UAC2 device on Windows
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
