[wdmaudiodev] Re: APO in EFX can't be disabled?

  • From: Artem <smirnoff.artem@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Fri, 20 Sep 2019 09:17:01 +0300

I'm using standard checkbox on the Advanced tab. Also the driver is
standard Microsoft USB Audio driver.

Thanks, I'll try to compile Audio effects discovery sample.

On Thu, 19 Sep 2019 at 18:28, Matthew van Eerde
<dmarc-noreply@xxxxxxxxxxxxx> wrote:


Is the “disable all enhancements” checkbox in question on the Advanced tab or 
on an audio-driver-provided enhancements tab?



If it’s on the Advanced tab, it controls the PKEY_AudioEndpoint_Disable_SysFx 
property.

https://docs.microsoft.com/en-us/windows/win32/coreaudio/pkey-audioendpoint-disable-sysfx



If it’s on an audio-driver-provided enhancements tab, then the checkbox does 
whatever the audio driver author wants it to do – hopefully this is also to 
control the PKEY_AudioEndpoint_Disable_SysFx property.



Some audio processing is so essential that to turn it off risks physical 
damage to the system it’s running on. In particular, if an APO advertises 
that it performs speaker protection, we won’t disable it, even if the 
property is set.



You can run the Audio effects discovery sample or audio effects discovery HLK 
tests to see what effects are provided.

https://code.msdn.microsoft.com/windowsapps/Audio-effects-discovery-5fd65c15

https://docs.microsoft.com/en-us/windows-hardware/test/hlk/testref/634e1f2a-de4f-4043-aa3c-ac43da164d11



From: Artem
Sent: Wednesday, September 18, 2019 11:49 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] APO in EFX can't be disabled?



Hi!

In my experiments I've found that "Disable all enhancements" checkbox
in sound device property page doesn't influence loading of EFX APO,
so it is still gets loaded by audio subsystem.

Is this by design or a bug?

OS is Windows 10 with updates.

regards,
Artem
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