| Microsoft DirectX 8.1 (C++) |
Use the IAMWstDecoder interface to work with the World Standard Teletext (WST) decoder.
In addition to the methods inherited from IUnknown, the IAMWstDecoder interface exposes the following methods.
| Method | Description |
| GetAnswerMode | Retrieves whether hidden text is exposed or not. |
| GetBackgroundColor | Retrieves the current physical color used in color keying the background for overlay mixing. |
| GetCurrentPage | Retrieves the current WST page. |
| GetCurrentService | Retrieves the current WST service. |
| GetDecoderLevel | Retrieves the WST decoder level. |
| GetDrawBackgroundMode | Determines whether the caption text background is opaque or transparent. |
| GetHoldPage | Determines whether the current WST page is held by the WST decoder. |
| GetOutputFormat | Retrieves the current output video format. |
| GetRedrawAlways | Retrieves whether the whole output bitmap should be redrawn for each sample. |
| GetServiceState | Retrieves whether closed captioning is on or off. |
| SetAnswerMode | Assigns whether hidden text is exposed or not. |
| SetBackgroundColor | Assigns the current physical color used in color keying the background for overlay mixing. |
| SetCurrentPage | Assigns the current WST page. |
| SetDrawBackgroundMode | Assigns the caption text background to be opaque or transparent. |
| SetHoldPage | Instructs the WST decoder to hold the current page. |
| SetOutputFormat | Assigns an output video format. |
| SetRedrawAlways | Sets whether the whole output bitmap should be redrawn for each sample. |
| SetServiceState | Sets closed captioning on or off. |