[wdmaudiodev] Re: Mixer compatibility under Vista
- From: Andrew Elder <aelder@xxxxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 10 Oct 2006 12:25:04 -0400
[RESEND] - below.
Stilll waiting for a comment from someone at MS.
If mixer one interface is "removed" (ie legacy mixerXXX()) under Vista,
documentation on how to use the new one should be available somewhere.
Is there a white paper on how to correctly represent a NxM hardware
mixer in WDM under Vista ?
Thanks,
Andrew
Andrew Elder wrote:
Can anyone on the Microsoft side propose the "approved" solution under
Vista for implementing hardware mixing of multiple render pins to
multiple line outs ?
A typical cards looks like that this:
<http://www.audioscience.com/internet/products/sound_cards/asi6644.htm>
Our plays and records support MPEG-1 audio Layers II and III.
Any Line In can also be mixed to any Line Out.
This must be a common problem, no ?
- Andrew
Jeff Pages wrote:
Hi Andrew,
Our cards don't do any output cross-mixing, so we were able to
provide all the functionality needed through the WDM mixer API. On XP
and earlier we provided input cross mixing, but Vista's "endpoint"
architecture precludes that so under Vista we're just presenting one
capture device (endpoint) per physical input. I'm not sure if the
loss of an input mixer will impact any of our clients though, but I
think the major concern was being able to pass the inputs through to
the outputs under program control and that can still be done either
in compatibility mode or using the new DeviceTopology API.
Jeff
----- Original Message ----- From: "Andrew Elder"
<aelder@xxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Thursday, September 28, 2006 7:15 AM
Subject: [wdmaudiodev] Re: Mixer compatibility under Vista
Hi Jeff,
I recall from previous posts that you make audio cards that may have
some of the same issues as ours.
Do you expose your own custom mixing interface ?
- Andrew
Jeff Pages wrote:
Hi Andrew,
I'm pretty sure I read in a post earlier this year that Vista
doesn't support non-WDM mixer DLLs, even in XP-compatibility mode.
Jeff
----- Original Message ----- From: "Andrew Elder"
<aelder@xxxxxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Thursday, September 28, 2006 12:46 AM
Subject: [wdmaudiodev] Mixer compatibility under Vista
[RESEND - no response]
All,
We have wave driver that doesn't show any mixer devices under
Vista RC-1, even when we do the following "compatibility" step:
"{Starting with RC1 (build 6500) you can activate the mixer shim by
checking the "Run this program in compatibility mode for: XP (Service
Pack 2)"."
This driver does not present a WDM audio interface. Instead, a DLL
is loaded by entries in Drivers32 (wave and mixer) and this
communicates via a custom interface to a kernel driver.
Our test application in this case is a simple console application
that calls mixerGetNumDevs() and mixerGetDevCaps(). Thats all. We
have added a call to GetVersionEx() to verify that the "shim" is
running.
This raises some questions:
1) is compatibility mode supposed to work with DLLs, or does it
expect a WDM audio interface ?
2) anyone else had issues similar to this one ?
3) any suggestions about what to test next ?
Thanks,
Andrew
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