IDirectSound3DBuffer::GetVelocity

The IDirectSound3DBuffer::GetVelocity method retrieves the current velocity for this sound buffer. Velocity is measured in units per second. The default unit is one meter, but this can be changed by using the IDirectSound3DListener::SetDistanceFactor method.

HRESULT GetVelocity(
  LPD3DVECTOR lpvVelocity  
);
 

Parameters

lpvVelocity

Address of a D3DVECTOR structure that will contain the sound buffer's current velocity.

Return Values

If the method succeeds, the return value is DS_OK.

If the method fails, the return value may be DSERR_INVALIDPARAM.

Remarks

Velocity is used for Doppler effects only. It does not actually move the buffer. For additional information, see Doppler Shift.

The default unit of measurement is meters per second, but this can be changed by using the IDirectSound3DListener::SetDistanceFactor method.

QuickInfo

  Windows NT: Use version 5.0 or later.
  Windows: Use Windows 95 or later. Available as a redistributable for Windows 95.
  Windows CE: Unsupported.
  Header: Declared in dsound.h.
  Import Library: Use dsound.lib.

See Also

IDirectSound3DBuffer::SetPosition, IDirectSound3DBuffer::SetVelocity