[wdmaudiodev] Re: Windows 7 :: usbaudio.sys
- From: "Daniel E. Germann" <deg@xxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sat, 29 Oct 2011 07:36:50 -0500
Hi, t.
I have been able to successfully play and record under Windows 7 with our
USB device, which packs 24-bit samples into 3-byte containers. There are
artifacts due to a bug in waveIn/waveOut sample rate conversion, but if the
application sample rate matches the sample rate set in the control panel, it
works fine.
http://social.msdn.microsoft.com/Forums/en-US/windowspro-audiodevelopment/thread/725546ce-57bf-40d0-b7aa-47e51de9c3ae/
Unfortunately, the same device can play successfully on Windows XP, but the
application gets erroneous data when recording if the device is opened in
24-bit mode. I tried packing the 24-bit data in both 3-byte and 4-byte
containers, and the results were the same. The returned sample data is
always 000000 or FFFFFF. If the application opens the device in 16-bit
mode, valid sample data is returned in the record buffer. This is
particularly confusing, since the device always sends 24-bit data.
Are you saying your device is able to play and record in 24-bit mode under
Windows XP? If so, would you be willing to email me (off list) the USB
descriptors you're using? We've been trying to figure out a solution for
this because many of our client's customers still use Windows XP.
Thank you,
-Dan
Date: Fri, 28 Oct 2011 13:10:46 -0700 (PDT)
From: -t <tge96@xxxxxxxxx>
Subject: [wdmaudiodev] Windows 7 :: usbaudio.sys
Hi,
I'm wondering if you might know if usbaudio.sys in Windows 7 supports
playback of 4-byte subframes with 24-bit resolution?
I have this topology working on my Windows XP 32-bit machine, and MacOS.
However, for some reason Windows 7 is giving me mixed results. My record
stream shows up in Sound, but my playback stream does not. The only thing
I'm doing that's a bit not standard is 4B subframe. I'm planning to try
with 3B subframe in the next couple of days or so, just to see if that
works.
First, I'd like to confirm whether or not usbaudio.sys in Windows 7
support this topology or not?
Many thanks,
-t
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