IAMWstDecoder Interface

Microsoft DirectShow 9.0

IAMWstDecoder Interface

The IAMWstDecoder interface sets and retrieves information about World Standard Teletext (WST). The WST Decoder filter implements this interface.

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.

Requirements

Header: Include Iwstdec.h.

Library: Use Strmiids.lib.