IMediaObject::GetInputStatus method (mediaobj.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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 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 |
|---|---|
|
Invalid stream index |
|
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
| Target Platform | Windows |
| Header | mediaobj.h (include Dmo.h) |
| Library | Dmoguids.lib |