[wdmaudiodev] Re: setting sample rate in the control panel in Vista
- From: Eugene Gavrilov <egavrilov@xxxxxxxxxxxxx>
- To: Chris W <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 29 Oct 2007 13:15:06 +0300
Hello Chris,
> There is very simple way to set default format in Vista:
> - set value PKEY_AudioEngine_DeviceFormat
> - set value PKEY_AudioEngine_MixFormat
> Both values are type VT_BLOB, value WAVEFORMATEXTENSIBLE.
> Mixer in Vista is 32 bit - you should set properly
> nAvgBytesPerSec,nBlockAlign,wBitsPerSample,Samples.
> Use GetValue function and cast pBlobData for WAVEFORMATEXTENSIBLE to look
> how system do it.
Yes, you are right, but in order to change PKEY_ values administrator
privileges are required. Moreover, Mitchell Rundle said earlier:
> You cannot set the device format via the propertyStore alone as this will
> cause
> the internal state of various audio core components to be out of sync.
Regards,
Eugene Gavrilov
Senior Software Engineer,
CEntrance, Inc.
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