IMediaObject::GetInputStreamInfo method (mediaobj.h)

Article
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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 GetInputStreamInfo method retrieves information about an input stream, such as any restrictions on the number of samples per buffer, and whether the stream performs lookahead on the input data. This information never changes.

Syntax

HRESULT GetInputStreamInfo(
        DWORD dwInputStreamIndex,
  [out] DWORD *pdwFlags
);

Parameters

dwInputStreamIndex

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

[out] pdwFlags

Pointer to a variable that receives a bitwise combination of zero or more DMO_INPUT_STREAM_INFO_FLAGS flags.

Return value

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

Return code	Description
DMO_E_INVALIDSTREAMINDEX	Invalid stream index
E_POINTER	NULL pointer argument
S_OK	Success

Remarks

The DMO_INPUT_STREAMF_HOLDS_BUFFERS flag indicates that the DMO performs lookahead on the incoming data.

The application must be sure to allocate sufficient buffers for the DMO to process the input. Call the IMediaObject::GetInputSizeInfo method to determine the buffer requirements.

Requirements

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

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