[wdmaudiodev] Re: White Papers now available

  • From: Matt Gonzalez <matt@xxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 04 Dec 2002 10:56:17 -0800

Right now we are supporting both VxD and WDM drivers for our products.  Since
our next products will only have WDM drivers, we will be supporting Me/2K/XP
only.

Matt

Martin Puryear wrote:

> [Note to self: read the entire thread before replying...]
> Thanks for the response Jerry. =20
>
> Without looking further, I don't understand why 98SE does not work with =
> 24-bit playback.  I unfortunately can state with some certainty that we =
> would not pursue a QFE for Windows 98 or 98SE.  From our point of view =
> 98SE and 98 (being four and five OSes ago) are pretty much history.  =
> After preaching the single-binary-across-multiple-OSes message for a =
> while, I hope that doesn't pose too much problem for you all. =20
>
> I realize that you folks are just now starting to make good money on the =
> operating systems that MS seems to have forgotten about in our focus on =
> ".Next".  Does your target still include 98 at this point, or do =
> some/all of you think about 2K/ME/XP only?
>
> ...just an informal poll.
>
> Martin Puryear
> Development Manager
> Windows Audio/Video Platform
>
> This posting is provided "AS IS" with no warranties, and confers no =
> rights.
> Ce message est fourni en l'=E9tat, sans garantie d'aucune sorte, et ne =
> vous conf=E8re aucun droit. Vous assumez tous les risques li=E9s =E0 son =
> utilisation.
>
> -----Original Message-----
> From: Jerry J. Trantow =
> [mailto:Jerry.Trantow@xxxxxxxxxxxxxxxxxxxxxxxxxxx]=20
> Sent: Monday, December 02, 2002 9:28 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: White Papers now available
>
> I have not retested the 24 bit playback issue with Win2000SP3 or WinMe =
> with the QFE.  Using the latest QFE's at the time, I observed truncation =
> with ever OS except WinXP. =20
> I used a test function which opens up various formats and sends playback =
> buffers of known values.  I also installed a filter driver on my audio =
> device which displayed the usb data sent to my device.  I would be happy =
> to post the code I used if anyone wants to verify the 24 bit playback =
> with the SPs and QFEs.
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx =
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Daniel E. Germann
> Sent: Thursday, November 28, 2002 8:30 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: White Papers now available
>
> Hi, Martin.
>
> Thanks for these great resources.  I was so excited I read them before I =
> had breakfast. ;-)
>
> In the Audio Device Performance white paper, I saw that a QFE is now =
> available for Windows Me to fix the KMixer "audio truncation to 16 bits =
> on playback" problem.  I knew about Windows 2000 SP3 having the fix, but =
> I hadn't heard about the Windows Me QFE.  Thanks.
>
> The white paper also says the truncation problem does not apply to =
> Windows 98 or Windows 98SE.  Is that correct?  I seem to recall Jerry =
> Trantow doing some testing with USB audio devices in July of 2001 that =
> indicated the truncation did occur in Windows 98SE.  If the Windows =
> 98[SE] KMixer isn't truncating output data, that would be good to know.  =
> We've been holding off on 24-bit USB devices and WDM Audio drivers =
> because of this issue.
>
> Thank you!
>
> Best regards,
> -Dan
>
> ----- Original Message -----
> > Subject: [wdmaudiodev] White Papers now available
> > Date: Wed, 27 Nov 2002 17:42:41 -0800
> > From: "Martin Puryear" <martinp@xxxxxxxxxxxxx>
> >
> > I would like to announce the immediate availability of two white
> papers.
> >
> > --------------------------
> > Audio Device Performance and Windows XP: Best Practices for Drivers
> >
> > http://www.microsoft.com/hwdev/tech/audio/highperf-drv.asp
> > ...
>
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