IMediaObject::GetInputStatus method (mediaobj.h)

發行項
4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetInputStatus method queries whether an input stream can accept more input data.

Syntax

HRESULT GetInputStatus(
        DWORD dwInputStreamIndex,
  [out] DWORD *dwFlags
);

Parameters

dwInputStreamIndex

Zero-based index of an input stream on the DMO.

[out] dwFlags

Pointer to a variable that receives either zero or DMO_INPUT_STATUSF_ACCEPT_DATA.

Return value

Returns an HRESULT value. Possible values include those in the following table.

Return code	Description
DMO_E_INVALIDSTREAMINDEX	Invalid stream index
S_OK	Success

Remarks

If the input stream will accept more data, the method returns the DMO_INPUT_STATUSF_ACCEPT_DATA flag in the dwFlags parameter. Otherwise, it sets this parameter to zero. If the stream will accept more data, the application can call the IMediaObject::ProcessInput method.

The status of an input stream can change only as the result of one of the following method calls.

Method	Description
IMediaObject::Discontinuity	Signals a discontinuity on the specified input stream.
IMediaObject::Flush	Flushes all internally buffered data.
IMediaObject::ProcessInput	Delivers a buffer to the specified input stream.
IMediaObject::ProcessOutput	Generates output from the current input data.

Requirements

Requirement	Value
Target Platform	Windows
Header	mediaobj.h (include Dmo.h)
Library	Dmoguids.lib

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