Adding Output Nodes with TopoEdit
In a topology, an output node represents a media sink that receives media data from a transform node and presents it for playback. The type of output node depends on the media type of the source node.
The following table shows the menu/toolbar command for adding an output node to the topology.
| Source media type | Menu/Toolbar Command | Description |
|---|---|---|
| Audio stream | On the Topology menu, click Add SAR. | Creates an output node for the Streaming Audio Renderer (SAR) that plays an audio stream through an audio device such as a sound card. |
| Video stream | On the Topology menu, click Add EVR. | Creates an output node for the enhanced video renderer (EVR) that displays frames for a video stream. |
| Custom media sink | - On the Topology menu, click Add Custom Sink. The Input Custom GUID dialog box opens. - In the GUID: field, enter the GUID of your custom sink that you want to add to the topology. Note: TopoEdit expects the GUID in the format "{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}". Otherwise, it fails to add the node and displays an "Invalid GUID" error message. - Click OK. |
Creates an output node for the stream sink for a custom media source. The custom sink must support CoCreateInstance so that the sink can be specified with a CLSID. |
TopoEdit creates the specified output node. The Topology Pane shows the output node as a green box that shows the name of the stream sink.
For information about adding output nodes programmatically by using Media Foundation APIs, see Creating Output Nodes.