[wdmaudiodev] Wave ID from DirectSound GUID
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 21 Dec 2005 15:49:52 +1100
Following the procedure described in the DirectSound documentation under System
Property Sets, I'm trying to use the DSPROPERTY_DIRECTSOUNDDEVICE_DESCRIPTION
property call to obtain the waveOut ID corresponding to a DirectSound GUID. The
call succeeds, but it appears to only fill in the Type field of the
DSPROPERTY_DIRECTSOUNDDEVICE_DESCRIPTION_DATA structure (which it sets to
DIRECTSOUNDDEVICE_TYPE_WDM), and the Description, Module, Interface and
WaveDeviceID fields are left untouched.
This is the code I'm using (the machine is running Windows XP SP2):
typedef HRESULT (__stdcall tDllGetClassObject) (REFCLSID, REFIID, LPVOID *);
UINT WaveDeviceID = 0;
HMODULE mDSound = LoadLibrary ("dsound.dll");
tDllGetClassObject *pDllGetClassObject = (tDllGetClassObject *) GetProcAddress
(mDSound, "DllGetClassObject");
if (pDllGetClassObject) {
IClassFactory *pClassFactory;
if ((*pDllGetClassObject) (CLSID_DirectSoundPrivate, IID_IClassFactory,
(PVOID *) &pClassFactory) == S_OK) {
IKsPropertySet *pPropertySet;
if (pClassFactory->CreateInstance (NULL, IID_IKsPropertySet, (PVOID *)
&pPropertySet) == S_OK) {
DSPROPERTY_DIRECTSOUNDDEVICE_DESCRIPTION_DATA Property;
memset (&Property, 0, sizeof Property);
Property.DataFlow = DIRECTSOUNDDEVICE_DATAFLOW_RENDER;
Property.DeviceId = PlaybackGuid; // PlaybackGuid is obtained
elsewhere from enumerating the DSound devices
ULONG BytesReturned;
HRESULT rc = pPropertySet->Get (
DSPROPSETID_DirectSoundDevice,
DSPROPERTY_DIRECTSOUNDDEVICE_DESCRIPTION,
NULL,
0,
&Property,
sizeof Property,
&BytesReturned
);
WaveDeviceID = Property.WaveDeviceId;
pPropertySet->Release ();
}
pClassFactory->Release ();
}
}
FreeLibrary (mDSound);
Any thoughts on what I might be doing wrong?
Jeff Pages
Innes Corporation Pty Ltd
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