[wdmaudiodev] Re: USB audio changes in Vista?
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 2 Oct 2007 10:05:19 +1000
Jerry wrote:
Now that I understand what's going on, Can I change my USB descriptor or
my
.inf to get the OS to choose a stereo 24bit 48K as the default inputs for
my
device???
You can set the default format for your device in your INF file as follows:
In the AddReg statement for your topology port, add an
OEMSettingsOverride.AddReg, eg.
[Auricon.Interface.Topology1]
AddReg=Auricon.I.Topo1.AddReg, OEMSettingsOverride.AddReg
Then define OEMSettingsOverride.AddReg as follows:
;; Set default format to 48kHz, 24-bit, Stereo
[OEMSettingsOverride.AddReg]
HKR,"EP\\0", %PKEY_AudioEndpoint_Association%,,%KSNODETYPE_LINE_CONNECTOR%
HKR,"EP\\0", %PKEY_AudioEngine_OEMFormat%, %REG_BINARY%,
41,00,8C,70,28,00,00,00,FE,FF,02,00,80,BB,00,00,00,DC,05,00,08,00,20,00,16,00,18,00,03,00,00,00,01,00,00,00,00,00,10,00,80,00,00,AA,00,38,9B,71
The PKEY_AudioEngine_OEMFormat structure is defined as:
{
VARTYPE VT_BLOB; //0x0041
short Padding; // Don't care
ULONG ByteCountOfWhatFollows; // 0x00000028
WAVEFORMATEXTENSIBLE Format;
}
Finally, you need to define the GUIDs in your [Strings] section:
PKEY_AudioEndpoint_Association = "{1DA5D803-D492-4EDD-8C23-E0C0FFEE7F0E},2"
PKEY_AudioEngine_OEMFormat = "{E4870E26-3CC5-4CD2-BA46-CA0A9A70ED04},3"
There was some discussion of this here late last year if I recall, if you
want to delve back through the archives.
Jeff
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