IAMLine21Decoder::SetRedrawAlways
| Microsoft DirectShow 9.0 |
IAMLine21Decoder::SetRedrawAlways
The SetRedrawAlways method specifies whether the Line 21 Decoder filter redraws the entire output bitmap for each sample.
Syntax
HRESULT SetRedrawAlways( BOOL bOption );
Parameters
bOption
Specifies 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 Values
Returns S_OK if successful, or an error code otherwise.
Remarks
Generally, applications should not call this method. The downstream mixer or renderer filter should call this method with the value TRUE if it writes into the buffers that it receives from the Line 21 Decoder filter. Redrawing degrades performance and increases CPU load, because it negates any potential optimizations.
Requirements
Header: Include il21dec.h.
Library: Use Strmiids.lib.
See Also