The GetDopplerFactor method retrieves the multiplier for the Doppler effect.
HRESULT GetDopplerFactor( D3DVALUE * pflDopplerFactor );
If the method succeeds, the return value is DS_OK. If the method fails, the return value may be DSERR_INVALIDPARAM.
The Doppler factor has a range of DS3D_MINDOPPLERFACTOR (no Doppler effects) to DS3D_MAXDOPPLERFACTOR (defined as 10 times the Doppler effects found in the real world). The default value is DS3D_DEFAULTDOPPLERFACTOR (1.0).
Header: Declared in Dsound.h.
Import Library: Use Dsound3d.dll.