If you want to circumvent the designed solution and lie to Windows about being
a 7.1-only endpoint, you certainly can… that is, there’s nothing Microsoft can
do to stop you…
… but I’m not going to HELP you do it :-)
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of Michael Johansen <johansen.mic@xxxxxxxxx>
Sent: Wednesday, September 26, 2018 2:20:20 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: 7.1 audio on stereo endpoint
Matthew. Can you point me in the direction should we want a plan B i.e. our 2
channel endpoint appears as a 7.1 endpoint to applications.
Den fre. 21. sep. 2018 kl. 19.52 skrev Michael Johansen
<johansen.mic@xxxxxxxxx<mailto:johansen.mic@xxxxxxxxx>>:
The tests so far have not been too convincing. Most skip
"IsInputformatsupported" and just request the mix format.
But now we will test on newer games and continue on the APO track. I just want
to know what our options are should the customer want to know what they are.
I am a driver developer but never coded an audio driver. Only USB and PCI and
NDIS stuff.
Michael
Den fre. 21. sep. 2018 kl. 19.07 skrev Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx>>:
Good, most PC games use one of a small handful of gaming engines (e.g. Unity),
and there are some higher-level audio APIs designed for use in gaming engines
(e.g. XAudio2) so there is a good chance for success.
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of Michael Johansen
<johansen.mic@xxxxxxxxx<mailto:johansen.mic@xxxxxxxxx>>
Sent: Friday, September 21, 2018 9:53:21 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: 7.1 audio on stereo endpoint
Primarily PC games.
Michael
Den fre. 21. sep. 2018 kl. 18.02 skrev Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx>>:
Can you share the specific applications in question? The designed approach is
to convince those applications to switch from whatever API they’re using to an
API that does the appropriate IAudioClient::IsFormatSupported calls for this to
work (e.g., Media Foundation)
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of Michael Johansen
<johansen.mic@xxxxxxxxx<mailto:johansen.mic@xxxxxxxxx>>
Sent: Friday, September 21, 2018 6:55:59 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] 7.1 audio on stereo endpoint
I have a customer that wants to process 7.1 sound but to a new 2.0 device that
is using Microsoft standard drivers i.e. no driver package.
They started creating an APO (SFX). I have helped them modify it so it can do
surround virtualization and it now can accept 7.1 in and send 2.0 out. No
problem.
The problem is legacy applications that use the mix format or look at the
device endpoint channel count. The question is if they want the big solution
(handling new and legacy applications) what is the best way to go?
Do they have to write their own driver for the product?
Michael Johansen
Consultant
