Microsoft DirectX 9.0


The Calibrate method calibrates an external device's transport mechanism.


HRESULT Calibrate(
  HEVENT hEvent,
  long Mode,
  long *pStatus



[in]  Handle to an event. The event is signaled when the action is complete.


[in]  Specifies a value that activates or deactivates the calibration process:

Value Description
ED_ACTIVE Activates the calibration process.
ED_INACTIVE Deactivates the calibration process.
NULL No action; return the calibration status in pStatus.


[out]  Pointer to a long integer that receives one of the following values:

Value Description
OATRUE Calibration is active.
OAFALSE Calibration is inactive.

Return Values

When this method succeeds, it returns S_OK. Otherwise it returns an HRESULT error code.


Use this method on certain external devices that require calibration; for example, rewinding a tape and resetting the counter, or computing the frame offset for a timecode reader.

Filters for various external devices can implement this method differently, depending on the calibration that the device needs. This method assumes the IMediaEventSink interface has already established an event sink, or that another event signaling method has been established.

DV Implementation

MSDV does not support this method. It returns E_NOTIMPL.

See Also