|Microsoft DirectX 9.0|
The GetVelocity method retrieves the velocity of the sound source.
HRESULT GetVelocity( D3DVECTOR * pvVelocity );
Address of a D3DVECTOR structure that receives the sound buffer's velocity, in meters per second by default.
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be DSERR_INVALIDPARAM.
Velocity is used for Doppler effects only. It does not actually move the buffer. For more information, see Doppler Effect.
The default unit of measurement is meters per second, but this can be changed by using the IDirectSound3DListener8::SetDistanceFactor method.
Header: Declared in dsound.h.