IAMLine21Decoder::GetRedrawAlways 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetRedrawAlways method indicates whether the Line 21 Decoder filter redraws the entire output bitmap for each sample.

Syntax

HRESULT GetRedrawAlways(
  LPBOOL lpbOption
);

Parameters

lpbOption

Pointer to a variable that receives one of the following values.

Value Description
TRUE The filter always redraws the entire bitmap.
FALSE The filter does not always redraw the entire bitmap. (Default)

Return value

Returns an HRESULT value. Possible values include the following.

Return code Description
E_INVALIDARG
Invalid argument
S_OK
Success

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header il21dec.h
Library Strmiids.lib

See also

Error and Success Codes

IAMLine21Decoder Interface

IAMLine21Decoder::SetRedrawAlways