## IDirectDrawVideoPort

Applications use the methods of the IDirectDrawVideoPort interface to channel live video data from a hardware video port to a DirectDraw surface. This section is a reference to the methods of this interface. For a conceptual overview, see Video-Ports.

The methods of the IDirectDrawVideoPort interface can be organized into the following groups:

Color controls | GetColorControls
| SetColorControls
Fields and Signals | GetFieldPolarity
| GetVideoSignalStatus
Flipping | Flip
| SetTargetSurface
Formats | GetInputFormats
| GetOutputFormats
Timing and Synchronization | GetVideoLine
| WaitForSync
Video control | StartVideo
| StopVideo
| UpdateVideo
Zoom factors | GetBandwidthInfo

The IDirectDrawVideoPort interface, like all COM interfaces, inherits the IUnknown interface methods. The IUnknown interface supports the following three methods:

AddRef |
QueryInterface |
Release |

You can use the LPDIRECTDRAWVIDEOPORT data type to declare a variable that contains a pointer to an IDirectDrawVideoPort interface. The Dvp.h header file declares the LPDIRECTDRAWVIDEOPORT with the following code:

typedef struct IDirectDrawVideoPort FAR *LPDIRECTDRAWVIDEOPORT;