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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.
| Return code | Description |
|---|---|
|
Invalid argument |
|
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 |