The IDirectSoundCaptureBuffer::GetStatus method retrieves the current status of the sound capture buffer.
HRESULT IDirectSoundCaptureBuffer::GetStatus(
DWORD *lpdwStatus
);
DSCBSTATUS_CAPTURING
DSCBSTATUS_LOOPING
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be DSERR_INVALIDPARAM.