[wdmaudiodev] Re: USB audio record problem

  • From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Sat, 15 Oct 2011 00:26:42 +0000

If the device supports only 24-bits-in-24-bit containers, I would expect the 
driver to fail any request for 24-bit-in-32-bit containers.  If the driver is 
falsely accepting requests for formats that the hardware doesn't support, that 
would explain why the audio data is corrupted.

From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Daniel E. Germann
Sent: Friday, October 14, 2011 5:08 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: USB audio record problem

Just to be 100% sure, I connected a USB analyzer to our USB audio device, and I 
can confirm that valid audio data is being sent over the USB, and not just 
000000's or FFFFFF's.  I can see audio on the USB analyzer even when there's 
only 000000's and FFFFFF's in the capture buffer.

I am even more confused than ever.  Is there any way a USB audio device could 
misbehave and cause the USB audio stack in Windows XP to do this, even when 
there's valid audio being sent over the USB?

Thank you,
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