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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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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
E_INVALIDARG
Invalid argument
S_OK
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

See also

Error and Success Codes

IAMLine21Decoder::SetServiceState