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Topology Node Attributes

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The following attributes apply to topology nodes.

General Topology Node Attributes

Attribute Description
MF_TOPONODE_CONNECT_METHOD Specifies how the topology loader connects this topology node, and whether this node is optional.
MF_TOPONODE_DECODER Specifies whether a toplogy node's object is a decoder.
MF_TOPONODE_DECRYPTOR Specifies whether a toplogy node's underlying object is a decryptor.
MF_TOPONODE_DISCARDABLE Specifies whether the pipeline can drop samples from a topology node.
MF_TOPONODE_ERROR_MAJORTYPE Contains the major media type for a topology node. This attribute is set when the topology fails to load because the correct decoder could not be found.
MF_TOPONODE_ERROR_SUBTYPE Contains the media subtype for a topology node. This attribute is set when the topology fails to load because the correct decoder could not be found.
MF_TOPONODE_ERRORCODE Contains the error code from the most recent connection failure for this topology node.
MF_TOPONODE_LOCKED Specifies whether the media types can be changed on this topology node.
MF_TOPONODE_MARKIN_HERE Specifies whether the pipeline applies mark-in at this node.
MF_TOPONODE_MARKOUT_HERE Specifies whether the pipeline applies mark-out at this node.

 

Source Node Attributes

Attribute Description
MF_TOPONODE_MEDIASTART Specifies the start time of a presentation, relative to the start the media source file, in 100-nanosecond units.
MF_TOPONODE_MEDIASTOP Specifies the stop time of a presentation, relative to the start the media source file, in 100-nanosecond units.
MF_TOPONODE_PRESENTATION_DESCRIPTOR Contains a pointer to the presentation descriptor for the media source.
MF_TOPONODE_SEQUENCE_ELEMENTID Specifies the element that contains a source node.
MF_TOPONODE_SOURCE Contains a pointer to the media source associated with a topology node.
MF_TOPONODE_STREAM_DESCRIPTOR Contains a pointer to the stream descriptor for the media source.
MF_TOPONODE_WORKQUEUE_ID Specifies a work queue for a topology node.
MF_TOPONODE_WORKQUEUE_MMCSS_CLASS Specifies a Multimedia Class Scheduler Service (MMCSS) task for a topology node.
MF_TOPONODE_WORKQUEUE_MMCSS_TASKID Specifies a MMCSS task identifier for a topology node.

 

Transform Node Attributes

Attribute Description
MF_TOPONODE_D3DAWARE Specifies whether the transform associated with a topology node supports DirectX Video Acceleration (DXVA)
MF_TOPONODE_DRAIN Specifies when a transform is drained.
MF_TOPONODE_FLUSH Specifies when a transform is flushed.
MF_TOPONODE_TRANSFORM_OBJECTID The class identifier (CLSID) of the transform associated with this topology node.

 

Output Node Attributes

Attribute Description
MF_TOPONODE_DISABLE_PREROLL Specifies whether the Media Session uses preroll on the media sink represented by this topology node.
MF_TOPONODE_NOSHUTDOWN_ON_REMOVE Specifies whether the Media Session shuts down the media sink when the output node is removed from the topology.
MF_TOPONODE_RATELESS Specifies whether the media sink associated with this topology node is rateless.
MF_TOPONODE_STREAMID The stream identifier of the stream sink associated with this topology node.

 

Tee Node Attributes

Attribute Description
MF_TOPONODE_PRIMARYOUTPUT Indicates which output is the primary output on a tee node.

 

IMFTopologyNode

Media Foundation Attributes

Topology Attributes