Hello Matthew,
thank you for clarification. Is there any chance that the MIDI code of the USB
Audio Class 1 driver makes it into the Audio Class 2 version? Or that the
Composite Driver detects this case and instantiates the UAC1 driver for the
MIDI function?
When splitting Audio and MIDI into two separate functions one needs two
Interface Association descriptors in the Configuration descriptor. The USB
specification is a little bit unclear on whether an OS should support this.
Does Windows handle this case correctly?
Thanks, that’s helpful.
The documentation you quote in the beginning of the thread is a little
unclear, but the intended message was this:
Microsoft has two different USB Audio drivers. The first driver (introduced
in Windows 98) is wdma_usb.inf/usbaudio.sys and supports USB Audio 1.0,
including MIDI. The second driver (introduced in an update to Windows 10) is
usbaudio2.inf/usbaudio2.sys and supports USB Audio 2.0 streaming… but not
MIDI.
Your device supports USB Audio 2.0 streaming and MIDI.
You can get it to work with Windows 10 by splitting the MIDI interface into
its own function, separate from the streaming function (much like the HID
interface is separate.) Then usbaudio.sys will load on the function with the
MIDI interface and usbaudio2.sys will load on the function with the streaming
interface.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of Franz Detro <franz.detro@xxxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, December 19, 2017 12:13:34 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: USB Audio Class 2 driver and MIDI
We’re looking at your logs and we need some more information. Can you send
the USB descriptor of the device?
sure, attached as .txt.
USBView still has issues with dumping UAC2 stuff, but the MIDI interface /
endpoints are parsed correctly. Anyways I have added an alternative dump
using another tool.
Run UsbView
https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/usbview ;
<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fwindows-hardware%2Fdrivers%2Fdebugger%2Fusbview&data=02%7C01%7CMatthew.van.Eerde%40microsoft.com%7C694f7038d6a349dc2d9a08d546b87c30%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636492681174616395&sdata=lGKM5tDjMZloCkzr6wgPO9JpWQOSFp93NRwTrUS5E9Q%3D&reserved=0>
Go to the Options menu and make sure “Show Config Descriptors” is checked
Click on the port that the USB device is plugged into
Right-click on the right half of the screen where the text is | Select All
Right-click again | Copy
Paste into a text file or email and send to me
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> <wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on behalf of Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx <mailto:dmarc-noreply@xxxxxxxxxxxxx>>
Sent: Friday, November 17, 2017 8:33:43 AM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: USB Audio Class 2 driver and MIDI
The internal bug number is 14610254 which may help you if you want to create
a support incident.
From: Franz Detro <mailto:franz.detro@xxxxxxxxxxxxxxxxxxxxx>
Sent: Friday, November 17, 2017 1:23 AM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: USB Audio Class 2 driver and MIDI
Hello Matthew,
do you have any news on this?
OK, please file a problem report in Feedback Hub; use Hardware, Devices, and
Drivers | Audio and sound; once filed use the “Share” widget to send me a
direct link.
https://aka.ms/Cgbvl7 ;
<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Faka.ms%2FCgbvl7&data=02%7C01%7CMatthew.van.Eerde%40microsoft.com%7Ceb4a404e4de7463af49a08d52d9cc95c%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636465073805310414&sdata=dEqMF6Sr9FqOaPWAwkH%2Bi8LklAv05JeQnr6pMip7l84%3D&reserved=0>
I can connect with the developers through a support incident if necessary.
https://blogs.msdn.microsoft.com/matthew_van_eerde/2016/09/26/report-problems-with-logs-and-suggest-features-with-the-feedback-hub/
<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.msdn.microsoft.com%2Fmatthew_van_eerde%2F2016%2F09%2F26%2Freport-problems-with-logs-and-suggest-features-with-the-feedback-hub%2F&data=02%7C01%7CMatthew.van.Eerde%40microsoft.com%7Ceb4a404e4de7463af49a08d52d9cc95c%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636465073805310414&sdata=Wgba8oVtDQDgYXS4BZshaN99fF%2F%2BtQPxqSzp9sk%2Bw%2Bo%3D&reserved=0>
<772BCEE7A77044608216875A7C0E2EA6.png>
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> <wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on behalf of Franz Detro
<franz.detro@xxxxxxxxxxxxxxxxxxxxx
<mailto:franz.detro@xxxxxxxxxxxxxxxxxxxxx>>
Sent: Thursday, November 9, 2017 3:25:54 AM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: USB Audio Class 2 driver and MIDI
Can you go into Device Manager, view by container, expand the peripheral in
question, and send a screenshot?
here we go:
<TKS4m2.png>
iAP Interface is not bound to a driver (iOS only), the other interface with
exclamation mark is the DFU interface (no matching driver installed).
<TKS4m2-uac2.png>
<772BCEE7A77044608216875A7C0E2EA6.png>
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx> <wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on behalf of Franz Detro
<franz.detro@xxxxxxxxxxxxxxxxxxxxx
<mailto:franz.detro@xxxxxxxxxxxxxxxxxxxxx>>
Sent: Wednesday, November 8, 2017 7:28:00 AM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] USB Audio Class 2 driver and MIDI
Hi there!
I have issues with MIDI ports not being available in the system when the
Microsoft Windows 10 UAC2 driver is loaded (latest version 10.0.17025.1000
from Windows 10 Insider Preview Build 17025.rs_prerelease.171020-1626).
Microsoft documentation at
https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/usb-2-0-audio-drivers
<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fwindows-hardware%2Fdrivers%2Faudio%2Fusb-2-0-audio-drivers&data=02%7C01%7CMatthew.van.Eerde%40microsoft.com%7C83fb5df2bdfc4424cc5d08d526bd6ac9%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636457517369882738&sdata=1oAPQ1v8OAIut5WqHHy0jp2Av9cU%2BMppG%2FTjEPSmTd4%3D&reserved=0>
claims that the USB Audio Class 1 driver should be loaded for the MIDI
interface / function:
USB Audio 2.0 Devices with MIDI (subclass 0x03 above) will enumerate the
MIDI function as a separate multi-function device with usbaudio.sys (USB
Audio 1.0 driver) loaded.
Does this work for somebody on this list?
Franz
