IDirectSound3DBuffer8::GetVelocity Method
[The feature associated with this page, DirectSound, is a legacy feature. It has been superseded by WASAPI and Audio Graphs. Media Casting have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Media Casting instead of DirectSound, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The GetVelocity method retrieves the velocity of the sound source.
Syntax
HRESULT GetVelocity(
D3DVECTOR * pvVelocity
)
Parameters
- pvVelocity
Address of a D3DVECTOR structure that receives the sound buffer's velocity, in meters per second by default.
Return Value
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 more information, see Doppler Effect.
The default unit of measurement is meters per second, but this can be changed by using the SetDistanceFactor method.
Requirements
Header: Declared in DSound.h.
Library: Use Dsound3d.dll.