What is the terminal type in KSPIN_DESCRIPTOR.Category?
From: Edward Abramian<mailto:edwabr123@xxxxxxxxx>
Sent: Monday, December 12, 2016 3:22 PM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Multichannel audio USB support
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).aspx
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.