IAMLine21Decoder::GetServiceState 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetServiceState method indicates whether closed captioning is on or off.
Syntax
HRESULT GetServiceState(
AM_LINE21_CCSTATE *lpState
);
Parameters
lpState
Pointer to a variable that receives a member of the AM_LINE21_CCSTATE enumeration.
Return value
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
|---|---|
|
Invalid argument |
|
Success |
Remarks
By default, the Line 21 Decoder enables closed captioning.
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 |