IDirectSound3DListener::SetVelocity
The IDirectSound3DListener::SetVelocity method sets the listener's velocity.
HRESULT SetVelocity(
D3DVALUE x,
D3DVALUE y,
D3DVALUE z,
DWORD dwApply
);
Parameters
x, y, and z
Values whose types are D3DVALUE and that represent the coordinates of the listener's new velocity vector. Note that Directsound may adjust these values to prevent floating-point overflow.
dwApply
Value indicating when the setting should be applied. This value must be one of the following:
| 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. |
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 only for Doppler effects. It does not actually move the listener. To change the listener's position, use the IDirectSound3DListener::SetPosition method. The default velocity is (0,0,0).
QuickInfo
Windows NT: Use version 5.0 or later.
Windows: Use Windows 95 OSR2 or later. Available as a redistributable for Windows 95.
Windows CE: Unsupported.
Header: Declared in dsound.h.
Import Library: Use dsound.lib.
See Also