Is your driver installed on real hardware, or are you creating a virtual
root-enumerated node?
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on
behalf of Johannes Freyberger <jfreyberger@xxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, August 14, 2018 2:17:28 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] AW: Re: set the default audio format dynamically
during/after driver installation
I’m installing my drivers using devcon and normally I’m removing the old
drivers before this by using devcon remove. So probably the driver is
completely removed and no settings will persist. Now I did a test without
calling devcon remove. This results in two instances of my driver. In device
manager both instances show the new version of the driver, in the sound
properties the old version keeps the sample format (44.1 kHz, 16 Bit) while the
new version is set to 48kHz, 24 Bits according to my inf. But the volume
doesn’t persist for the old driver and is set to 100 for both instances.
The way to remove the old driver seems the better way to me and so I’d like to
know if there’s a way to set the default format only via the signed inf file or
also after the driver installation but still inside my installer i.e. by
setting the corresponding registry entries?
Thanks and best regards,
Johannes
Von: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> Im
Auftrag von Matthew van Eerde (Redacted sender "Matthew.van.Eerde" for DMARC)
Gesendet: Montag, 13. August 2018 16:35
An: wdmaudiodev@xxxxxxxxxxxxx
Betreff: [wdmaudiodev] Re: set the default audio format dynamically
during/after driver installation
Do other settings persist across driver version upgrade, e.g. volume?
________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on
behalf of Johannes Freyberger
<jfreyberger@xxxxxxxxxxxxxxxxxxxx<mailto:jfreyberger@xxxxxxxxxxxxxxxxxxxx>>
Sent: Monday, August 13, 2018 1:49:19 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] set the default audio format dynamically during/after
driver installation
Hi all,
I’ve written a virtual audio driver and during the installation I’m setting the
default format by defining the registry entry PKEY_AudioEngine_OEMFormat in my
inf file to 48kHz, 24 Bits. Some of our customers switch this to 44.1kHz, 24
Bits which is also supported by the driver and it works correct. Now when I
provide a new version of the driver the format is set back to 48kHz, 24 Bits
according to the inf file. But from a registry entry I’ve written before, I’d
know that the previous format was 44.1kHz. Is there a way to switch back to
44.1 kHz automatically after the driver update so the customer doesn’t have to
go to the drivers properties and do this manually? I thought about doing this
by finding the corresponding registry i.e. in
SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render and set the
values as I can watch it when I do this manually. But this doesn’t seem to
work. Modifying the inf file probably also is no option as this has to be
signed and thus cannot be modified at runtime.
Thanks and best regards,
Johannes
