The IDirectSoundCaptureBuffer::GetStatus method retrieves the current status of the capture buffer.
HRESULT 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.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dsound.h.
  Import Library: Use dsound.lib.