IAMLine21Decoder::SetDrawBackgroundMode method (il21dec.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The SetDrawBackgroundMode method specifies whether the Line 21 Decoder filter draws the captions on a transparent background or an opaque background. By default, the caption background is opaque.

Syntax

HRESULT SetDrawBackgroundMode(
  AM_LINE21_DRAWBGMODE Mode
);

Parameters

Mode

Specifies a member of the AM_LINE21_DRAWBGMODE enumeration.

Return value

Returns an HRESULT value. Possible values include the following.

Requirements

See also

Error and Success Codes

IAMLine21Decoder::GetDrawBackgroundMode