The IDirectSound3DBuffer::SetVelocity method sets the sound buffer's current velocity.
HRESULT SetVelocity(
D3DVALUE x,
D3DVALUE y,
D3DVALUE z,
DWORD dwApply
);
DS3D_DEFERRED | Settings are not applied until the application calls the IDirectSound3DListener::CommitDeferredSettings method. This allows the application to change several settings and generate a single recalculation. |
DS3D_IMMEDIATE | Settings are applied immediately, causing the system to recalculate the 3-D coordinates for all 3-D sound buffers. |
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 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.
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.
IDirectSound3DBuffer::SetPosition, IDirectSound3DBuffer::GetVelocity