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This interface is an optional interface for use by plug-in distributors to notify them of changes in the filter graph state.
When to Implement
Implement this interface when writing a plug-in distributor (PID) that is aggregated with the filter graph manager if you want the PID to receive notifications of control and changes in the composition of filter graphs.
PIDs may often use methods on the filter graph manager. During a call to an IDistributorNotifymethod, do not take any lock that may be held by another code path that calls the filter graph manager. To do so could result in a deadlock.
When to Use
The filter graph manager queries for this interface on any plug-in distributors that it aggregates.
If found, it calls the appropriate Run, Pause, or SetSyncSourcemethod before calling them on the IBaseFilterinterface of each filter. It calls the NotifyGraphChangemethod when a filter is added or removed, or when connections are changed.
Methods in Vtable Order
The following table shows the methods that appear in the Vtable beneath the standard COM methods inherited from IUnknown.
| Method | Description |
|---|---|
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Called when the filter graph is entering a stopped state. |
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Called when the filter graph is entering a paused state. |
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Called when the filter graph is entering a running state. |
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Called when a new clock is registered. |
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Called when the set of filters in the filter graph change or their connections change. |
Requirements
| Windows Embedded CE | Windows CE 2.12 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |
| Note | Microsoft DirectShow applications and DirectShow filters have
different include file and Library requirements
For more information, see Setting Up the Build Environment |