[wdmaudiodev] Re: How to set a driver's default sampling frequency and num channels

Hi Paul,

 

The OEMSettingsOverride.AddReg has to be included in the Topology Interface 
sections of the INF, i.e.

 

[NEW_Device.NTX86.Interfaces]

...

AddInterface=%KSCATEGORY_AUDIO%,%KSNAME_Topology1%,NEW_Device.Interface.Topology1

...

[NEW_Device.Interface.Topology1]

AddReg=NEW_Device.I.Topo1.AddReg, OEMSettingsOverride.AddReg

 

[NEW_Device.I.Topo1.AddReg]

HKR,,CLSID,,%Proxy.CLSID%

HKR,,FriendlyName,,%NEW_Device.Topology1.szPname%

 

Also, do you have KSNODETYPE_SPEAKER defined in the Strings section of your INF 
file? It should be:

KSNODETYPE_SPEAKER  = "{DFF21CE1-F70F-11D0-B917-00A0C9223196}"

 

Jeff

 

 

From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Titchener
Sent: Wednesday, 4 July 2012 12:09 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: How to set a driver's default sampling frequency and 
num channels

 

Hi Paul,

 

For Vista and later platforms, you can use PKEY_AudioEngine_OEMFormat in the 
INF file to do this. This is documented in the WDK under Media-Class INF 
Extensions 
(http://msdn.microsoft.com/en-us/library/windows/hardware/ff537752(v=vs.85).aspx).

 

Jeff

 

I’m not having any luck getting this to work.

 

As described in the link above, I added the section below to the driver’s .inf 
file:

 

[OEMSettingsOverride.AddReg]

HKR,"EP\\0", %PKEY_AudioEndpoint_Association%,,%KSNODETYPE_SPEAKER%

; Should set default to 48khz, 2 channel, 16 bits

HKR,"EP\\0", %PKEY_AudioEngine_OEMFormat%, %REG_BINARY%, 
41,00,00,00,28,00,00,00,FE,FF,02,00,80,BB,00,00,00,EE,02,00,04,00,10,00,16,00,10,00,03,00,00,00,01,00,00,00,00,00,10,00,80,00,00,AA,00,38,9B,71

 

I’m calling this added section as shown below:

[NEW_Device.NT]

Include=ks.inf,wdmaudio.inf

Needs=KS.Registration, WDMAUDIO.Registration

CopyFiles=NEW_Device.CopyList

AddReg=NEW_Device.AddReg, OEMSettingsOverride.AddReg

 

[Strings]

PKEY_AudioEndpoint_Association          = 
"{1DA5D803-D492-4EDD-8C23-E0C0FFEE7F0E},2"

PKEY_AudioEngine_OEMFormat              = 
"{E4870E26-3CC5-4CD2-BA46-CA0A9A70ED04},3"

 

After running the installation, on the Properties files for the driver regedit 
doesn’t show any lines with the E4870E26-3CC5-4CD2-BA46-CA0A9A70ED04 format key.

 

But if I use the Sound panel to manually change the sampling frequency, then as 
expected the lines with the E48 ... key value show up, holding the binary 
format info.

 

Am I doing something wrong or is there some other trick to get this to work?

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