[wdmaudiodev] Re: Vista default audio format
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 18 Apr 2006 12:10:18 +1000
Thanks Noel.
I've searched through my copy of the WDK (build 5112) but couldn't find the
sample inf file that you've quoted from, either in the documentation or the
source samples. Is this from a later build of the WDK, or am I missing
something?
I'm also not entirely sure of what to do with this. The
PKEY_AudioEngine_OEMFormat value appears to be in part a
WAVE_FORMAT_EXTENSIBLE structure, but I'm not sure what the first 8 bytes
are. Also this seems to be part of an HD Audio specification. Is this only
applicable to HD audio devices? Where does this fit into the INF file for a
plain old ordinary WavePCI device?
Jeff
----- Original Message -----
From: "Noel Cross" <noelc@xxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Tuesday, April 18, 2006 4:47 AM
Subject: [wdmaudiodev] Re: Vista default audio format
Good question Jeff. Here's an excerpt from a sample INF in the WDK that
contains the registry key that you should use to provide the default
format for your driver.
[HDAudio.SysFx]
Include=ks.inf, wdmaudio.inf, hdaudio.inf
Needs=KS.Registration, WDMAUDIO.Registration, HdAudOEM.CopyFiles,
HdAudOEM.AddReg
CopyFiles=SfxFx.CopyList
AddProperty=OEMCustomBranding.AddProperty
RegisterDlls=SfxFx.RegisterDlls
[HDAudio.SysFx.Interfaces]
AddInterface=%KSCATEGORY_TOPOLOGY%,%KSNAME_eLineOutTopo%,
HDAudio.SysFx.PrimaryLineOutTopo
[HDAudio.SysFx.PrimaryLineOutTopo]
AddReg = HDAudio.SysFx.PrimaryLineOutTopo.AddReg, SysFx.AddReg,
OEMSettingsOverride.AddReg
[OEMSettingsOverride.AddReg]
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,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 hope that this helps solve the problem you mention on this thread.
Thanks,
Noel
This posting is provided "AS IS" with no warranties, and confers no
rights.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Pages
Sent: Sunday, April 16, 2006 4:49 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Vista default audio format
I've noticed under Vista that our card is always set to16-bit 44.1kHz
sampling, even though it supports 24-bit resolution and all the commonly
used sampling rates up to 96kHz. I've discovered there is a "Format" tab
in
Device Properties (accessed from the Control Panel) that allows this to
be
changed, however the user is cautioned against doing so. "Unless you
have
good reason to do otherwise, it is strongly suggested that you use the
values that the system has chosen for you."
Is there any way for the driver to tell Windows what its preferred bit
depth
and sampling rate is, so as to make this the default format for the
device?
Our hardware runs its converters at a fixed rate (96kHz with 24-bit
resolution), with other rates and bit depths supported in firmware, and
if a
software sampling rate converter is going to be inserted into the
playback
or recording stream it would be preferred that it convert directly to
the
card's native format.
Jeff
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