[MultiMedia] How to Build the Filter Graph

Building the Filter Graph

1. Filter Graph Manager
• CLSID_FilterGraph: Creates the Filter Graph Manager on a shared worker thread. (通常都用CLSID_FilterGraph)
• CLSID_FilterGraphNoThread: Creates the Filter Graph Manager on the application thread. 
2. IGraphBuilder Interface
• Connect: Connects two pins. If they will not connect directly, this method connects them with intervening transforms.
• Render: Adds a chain of filters to a specified output pin to render it. (將Source的output pin 試著connect到已Add的filter)
• RenderFile: Builds a filter graph that renders the specified file. (也就是AutoRender)
• AddSourceFilter: Adds a source filter to the filter graph for a specific file. 
3. IMediaControl Interface
• Run: Runs all the filters in the filter graph.
• Pause: Pauses all filters in the filter graph.
• Stop: Stops all the filters in the filter graph.
• StopWhenReady: Pauses the filter graph, allowing filters to queue data, and then stops the filter graph.
• GetState: Retrieves the state of the filter graph. 
4. IMediaEventEx Interface
• SetNotifyWindow: Registers a window to process event notifications.
• SetNotifyFlags: Enables or disables event notifications.
• GetNotifyFlags: Determines whether event notifications are enabled. 

Reference

• Filter Graph Manager 
• Graph-Building Components