[wdmaudiodev] Re: Windows 7, multi-channel, 16-bit, dither bug?

  • From: Andrew Elder <aelder@xxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Tue, 16 Mar 2010 13:36:59 -0400
That is un-believable ! Of course it is on par with what appears to be Microsoft's catering to consumers level audio users rather than professions. Maybe you will have to recommend that your users purchase Apple computers. 

- Andrew

David A. Hoatson wrote:

So back in December I reported this bug to Microsoft.  I just received the
first response to the bug report today:
Here is the official response: ---------------------- 
Resolved as Won't Fix

Due to several factors the product team decided to focus its efforts on
other items.

A more detailed explanation for the resolution of this particular item may
have been provided in the comments section."
----------------------

No additonal information was given.

I asked the rest of my development team if I could use this on our
customers: "Hey, we decided we just don't want to bother fixing bugs.
Please continue to give us millions of dollars a year, though."  For some
reason they didn't think I could get away with it.  I guess I don't have
enough zeroes in my bank account.

This is why compaines get bad reputations.  You find a problem and report
it, and they just say "tough luck".  Why bother reporting bugs if Microsoft
isn't going to bother to fix them?  In fact knows about the problem and
says, "Don't bother us with these problems".

At least when Apple took three years to fix the bugs in Core Audio I
reported, they did fix it. :-)

Thank you,
David A. Hoatson 
Lynx Studio Technology, Inc.
www.lynxstudio.com

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of David A. Hoatson 
Sent: Monday, December 28, 2009 8:15 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Windows 7, multi-channel, 16-bit, dither bug? 

Posted bug with Microsoft Connect.

https://connect.microsoft.com/site148/feedback/ViewFeedback.as
px?FeedbackID=
522288

Thank you,
David A. Hoatson 
Lynx Studio Technology, Inc.
www.lynxstudio.com

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Frank Yerrace 
Sent: Wednesday, December 23, 2009 1:52 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Windows 7, multi-channel, 16-bit, dither bug?
Yes, it can't hurt. This is (at least) the second report of
this kind 
I've heard on this list.

Frank Yerrace
Microsoft
This posting is provided "AS IS" with no warranties, and confers no rights. 


-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of David A. Hoatson 
Sent: Wednesday, December 23, 2009 8:34 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Windows 7, multi-channel, 16-bit, dither bug? 

Frank,

Should I submit a bug report on this one?

Thank you,
David A. Hoatson 
Lynx Studio Technology, Inc.
www.lynxstudio.com

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of David A. 
Hoatson
Sent: Sunday, December 20, 2009 3:53 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Windows 7, multi-channel,
16-bit, dither 
bug?

Frank,

I am using our Lynx Demo app which I wrote.  It is using MME
(waveOutOpen) and the app doesn't touch the audio at all. Playing a 44.1kHz file and the hardware is also set at 
44.1kHz so no

SRC should be occuring in Windows.
Our hardware level meters go to -114dB so I can clearly see

the extra
bits getting messed with (shows -94dB, so I am seeing
20dB of noise 
above the threshold of the meters).
Since I wrote the driver & app and it is our hardware the

only part we
don't control is between MME and WDM in Windows, which is
of course 
why I made the post. :-)
We have not seen the same problem in Windows Vista, so it must be something new in Windows 7. 

Thank you,
David A. Hoatson 
Lynx Studio Technology, Inc.
www.lynxstudio.com

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of 
Frank Yerrace

Sent: Friday, December 18, 2009 2:54 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Windows 7, multi-channel,

16-bit, dither

bug?

How are you playing the file? What application? Or if you

wrote the

application, what audio API family is the application calling?

Also, just curious, how did you notice this? What

tools/process did

you use?

Frank Yerrace
Microsoft
This posting is provided "AS IS" with no warranties, and 
confers no

rights.

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of David A. 
Hoatson
Sent: Friday, December 18, 2009 9:55 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Windows 7, multi-channel, 16-bit,

dither bug?

Hello,
It appears that Windows 7 WDM audio sub-system has a
strange bug 
(feature?!?).  When in 16-bit multi-channel mode (I'm using

5.1 for my

testing), and playing back a stereo file, there is some

audio being
played back (at a very low level) on channels 3, 4, 5 &
6 when it 
should be streaming zeroes.
It is about 94dB down from the original signal, which
leads me to
think that somehow the audio sub-system is applying
dither to the
channels that should be playing silence. I haven't
tried this on
Vista yet, so I don't know if it does the same thing.
Windows XP 
obviously doesn't do this.
24-bit mode works as expected.

Any ideas?
Thank you, David A. Hoatson 
Lynx Studio Technology, Inc.
www.lynxstudio.com

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