Bumping this thread in case anyone knows how to enable "Configure" button
for accessing Speaker Setup control panel. In my driver based on
wdma_usb.inf it's grayed out. Any hint will be appreciated.
From: Edward Abramian [mailto:edwabr123@xxxxxxxxx] ;
Sent: Friday, December 2, 2016 4:37 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: RE: [wdmaudiodev] Re: Multichannel audio USB support
Removing APO_FLAG_SAMPLESPERFRAME_MUST_MATCH helped. Now I receive 6
channels in IsInputFormatSupported. Thanks for helping with this.
I noticed that "Configure" button for my USB device is grayed out. So, I
can't select preferable speaker configuration (Stereo, Quad, 5.1 etc) in
Speaker Setup control panel. I guess there should be something I need
declare in my .inf to make supported speaker configurations available for
user to choose from?
Thank you again for your great help!
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matthew van Eerde
(Redacted sender "Matthew.van.Eerde" for DMARC)
Sent: Friday, December 2, 2016 3:43 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
Try using TopoEdit.exe
https://msdn.microsoft.com/en-us/library/windows/desktop/ff485862(v=vs.85).a
spx
Set a breakpoint on your IAudioProcessingObject::IsInputFormatSupported
implementation
If you're using CBaseAudioProcessingObject, you will need to modify your
flags. The default flags have APO_FLAG_SAMPLESPERFRAME_MUST_MATCH. This will
reject any attempt to pair an input format and an output format with a
different number of channels.
// audioenginebaseapo.h
enum APO_FLAG
{
APO_FLAG_NONE = 0,
APO_FLAG_INPLACE = 0x1,
APO_FLAG_SAMPLESPERFRAME_MUST_MATCH = 0x2,
APO_FLAG_FRAMESPERSECOND_MUST_MATCH = 0x4,
APO_FLAG_BITSPERSAMPLE_MUST_MATCH = 0x8,
APO_FLAG_MIXER = 0x10,
APO_FLAG_DEFAULT = ( (
APO_FLAG_SAMPLESPERFRAME_MUST_MATCH | APO_FLAG_FRAMESPERSECOND_MUST_MATCH )
| APO_FLAG_BITSPERSAMPLE_MUST_MATCH )
} APO_FLAG;
From: Edward Abramian <mailto:edwabr123@xxxxxxxxx>
Sent: Friday, December 2, 2016 3:36 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
I keep receiving stereo in my SFX even if I play 5.1 audio file. Is there
something I need to expose in my .inf file to tell Windows that my USB
device supports multichannel input?
From: Edward Abramian [mailto:edwabr123@xxxxxxxxx] ;
Sent: Friday, December 2, 2016 2:38 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: RE: [wdmaudiodev] Re: Multichannel audio USB support
Will do. Thanks!
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matthew van Eerde
(Redacted sender "Matthew.van.Eerde" for DMARC)
Sent: Friday, December 2, 2016 2:04 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
Also, make sure to implement IAudioSystemEffects2::GetEffectsList
<https://msdn.microsoft.com/en-us/library/windows/desktop/dn280325(v=vs.85).
aspx> and report AUDIO_EFFECT_TYPE_VIRTUAL_SURROUND,
AUDIO_EFFECT_TYPE_VIRTUAL_HEADPHONES, and/or other effects types as
appropriate so that apps are aware of the processing you're doing.
From: Edward Abramian <mailto:edwabr123@xxxxxxxxx>
Sent: Friday, December 2, 2016 1:39 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
Thank you for clarifying this for me. I will try you recommendations.
Have a great weekend!
Edward
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matthew van Eerde
(Redacted sender "Matthew.van.Eerde" for DMARC)
Sent: Friday, December 2, 2016 1:33 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
I see, you want to provide custom downmixing.
You can do this by implementing an SFX APO that supports both stereo and
multichannel input, and always outputs stereo. Your driver package will have
an .inf and a .dll in it; no need for a custom .sys.
Media players will call IAudioClient::IsFormatSupported(.) with the source
content. If the source is multichannel, this will succeed, and your custom
downmixing will be in effect.
(To be complete, I will mention that whether IAudioClient::IsFormatSupported
is called depends on the particular API the app is using to stream. Some
legacy APIs will open in the mix format regardless of the source content.
For those apps, your SFX will be opened in stereo mode.)
From: Edward Abramian <mailto:edwabr123@xxxxxxxxx>
Sent: Friday, December 2, 2016 1:27 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
The resulting audio device will support multichannel input through
downmixing it into stereo in SFX. The downmixing is done the way it
preserves sound localization by use of binaural/HRTF techniques. So apps are
free to choose multichannel output on that device.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Friday, December 2, 2016 1:22 PM
To: wdmaudiodev@xxxxxxxxxxxxx <mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
Edward Abramian wrote:
To be clear on what exactly I need, let me describe it from the user
perspective. I want a USB audio device to show up as supporting multichannel
input, such as 5.1 or 7.1, so that user can configure it from Speaker Setup
control panel. Internally, per my understanding, this will mean downmixing
multichannel input into stereo in SFX to match USB headset stereo output.
If the hardware does not support 5.1 or 7.1, why would you want to pretend
that it does? That's just going to produce a confusing user experience.
Apps will assume they can exploit the additional channels.
--
Tim Roberts, timr@xxxxxxxxx <mailto:timr@xxxxxxxxx>
Providenza & Boekelheide, Inc.
