| Microsoft DirectX 9.0 |
The IBDA_Topology interface is implemented on BDA device filters. A single filter may represent multiple hardware devices (called control nodes) which may be connected in various ways within the filter itself. These connections generally represent hardware paths on the card. This interface provides methods that enable a Network Provider to configure or discover the types of nodes within the filter, and how these nodes are connected. The methods correspond closely to the Ring 0 property sets which are documented in the Windows DDK.
In addition to the methods inherited from IUnknown, the IBDA_Topology interface exposes the following methods.
| Method | Description |
| CreatePin | Creates an instance of a specified pin type. |
| CreateTopology | Associates an instance of an input pin with an instance of an output pin. |
| DeletePin | Deletes a pin from the filter's topology. |
| GetControlNode | Retrieves an IUnknown interface pointer for a specified control node. |
| GetNodeInterfaces | Retrieves a list of the interfaces supported by a node type. |
| GetNodeTypes | Retrieves a list of all the node types in the template topology for this filter and network type. |
| GetPinTypes | Retrieves a list of all the pin types in the template topology for this filter and network type. |
| GetTemplateConnections | Retrieves a list of all template connections that appear in the template topology for this filter and network type. |
| SetMediaType | Configures the media types that can be accepted by a particular pin. |
| SetMedium | Configures the media types that can be accepted by a particular pin. |