For questions about the session manager APIs I refer you to the Windows Pro
Audio Application Development forum
https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/home?forum=windowspro-audiodevelopment
or to StackOverflow.
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of eno rocky <binoddummy@xxxxxxxxx>
Sent: Tuesday, February 5, 2019 5:58:54 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Mixing applications audio stream in driver
Wow Thanks, that was really helpful Mathew.
I was able to do lots of thing with that.
Except RegisterDuckNotification for IAudioSessionManager2 returns OK but
notification never get called.
Thanks,
On Tue, Feb 5, 2019 at 10:30 PM Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx>> wrote:
You don’t need to write a driver to control application volume. There’s an API
for that.
https://blogs.msdn.microsoft.com/matthew_van_eerde/2013/09/26/getting-peak-meters-and-volume-settings-for-all-apps-and-audio-devices-on-the-system/<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.msdn.microsoft.com%2Fmatthew_van_eerde%2F2013%2F09%2F26%2Fgetting-peak-meters-and-volume-settings-for-all-apps-and-audio-devices-on-the-system%2F&data=02%7C01%7CMatthew.van.Eerde%40microsoft.com%7C579a5c59d5374bb79b4208d68c04dddb%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636850349912941308&sdata=VSd0VNYDwbk%2BjpNRrSxos48zMP92RepQKS1605xZVBE%3D&reserved=0>
There’s also already UI in Windows that users can use to control application
volume.
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of eno rocky <binoddummy@xxxxxxxxx<mailto:binoddummy@xxxxxxxxx>>
Sent: Tuesday, February 5, 2019 6:32:50 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Mixing applications audio stream in driver
Hi,
Thank you for clarification that was clear.
The main purpose of it was to gain control over each application stream volume.
As I don't think we can override the application volume in driver either.
Thanks,
On Tue, Feb 5, 2019, 3:36 PM Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx> wrote:
Since Windows Vista, no.
Windows mixes audio from all the applications together (inside the “user-mode
audio engine”) and hands the result of the mix to the audio driver, which is
expected to hand it directly to the digital-to-analog converter without further
mixing.
(It’s actually a little more complicated than that, but that’s the basic idea.)
But what are you really trying to do? Suppose I had said “yes”. What is your
scenario? Why do you want to mix inside an audio driver?
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of eno rocky <binoddummy@xxxxxxxxx<mailto:binoddummy@xxxxxxxxx>>
Sent: Monday, February 4, 2019 8:47:29 PM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Mixing applications audio stream in driver
Hi,
When multiple applications sends audio stream, global mixer is mixing audio.
Is there a way to mix it inside driver. Can driver do that?
Thanks,
On Mon, Feb 4, 2019, 10:31 PM Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx> wrote:
Sorry, but I don’t follow what you’re trying to do. Can you elaborate? Maybe
draw some audio flow diagrams?
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of eno rocky <binoddummy@xxxxxxxxx<mailto:binoddummy@xxxxxxxxx>>
Sent: Monday, February 4, 2019 4:59:32 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Mixing applications audio stream in driver
Hi,
lets forget about kmixer.sys.
What about KSCATEGORY_MIXER ? Can it be used for getting separate application
stream and later mix on my own?
Or, is there any other way ?
Thanks,
On Mon, Feb 4, 2019 at 5:52 PM Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx>> wrote:
Whatever MSDN document you found should be removed; kmixer.sys hasn’t existed
since Windows XP.
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of eno rocky <binoddummy@xxxxxxxxx<mailto:binoddummy@xxxxxxxxx>>
Sent: Sunday, February 3, 2019 9:59:33 PM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Mixing applications audio stream in driver
Hi,
According to msdn document, I found Kmixer.sys does mixing and gave back mixed
data stream through IMiniportWaveRTStream
Is there any way to mix it in driver.
I found KSCATEGORY_MIXER in ks.h, what does it really do? Is it the one for
each application stream mixing?
Also I found term hardware mixing. What mixing it refers to?
I am working on virtual driver.
One more thing can we override the volume control of each application like
master/Endpoint volume in driver?
Thanks,
