USBAudio.sys only does USB Audio 1.0. USB Audio 2.0 is supported, but uses
USBAudio2.sys.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> On
Behalf Of Support HpW-Works.com
Sent: Tuesday, July 12, 2022 11:26 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [EXTERNAL] [wdmaudiodev] New 48kHz (buffer over / under run) issue &
USBAudio.sys on 05/11/2022
Using Windows 10 Pro v. 21H2 build 19043.1766 with given latest update as
USBAudio.sys on 05/11/2022.
I use an USB Audio Class device on UAC2 mode. The device uses asynchronous
transfer mode (i.e. sends periodical feedback to Windows host).
The USB device indicates buffer over / under run and error states as on board
LED's as implemented on this HW.
Now since the last update using PLAY & WASAPI Exclusive & 48k/96k/192kHz / 32
bit, buffer over / under-runs happens as it gets.
It seem to have much more variance than before, which means, that much larger
buffers are required at device side!
I can manually adjust the master clock as 256 x 48kHz (12.288MHz +/- xxx Hz)
using a wave generator, so to detect where the best center frequency is to get
less over / under runs. But do not help.
The glue, using 44.1kHz based sample rates I do not get this over / under runs!
Now since this last USBAudio.sys any known changes happened:
a) what really changed
b) what was the cause
c) any conclusions on this for asynchronous mode?
Best Regards
HpW-Works Support
Mailto:support@xxxxxxxxxxxxx
Website:
http://www.hpw-works.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.hpw-works.com%2F&data=05%7C01%7CMatthew.van.Eerde%40microsoft.com%7Ca6e6402091314bdeda0808da643413d3%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637932472111327896%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Em6sxBWRbg2LhazPWTQBALKk420zfNMXoLqr4obygwk%3D&reserved=0>
