DirectX中的几个接口

一。IGraphBuilder Interface
    MSDN的解释：
    This interface provides methods that enable an application to build a filter graph. (这个接口提供了生成Filter Graph相关的方法)
二。IMediaControl Interface
    MSDN:
    The IMediaControl interface provides methods for controlling the flow of data through the filter graph. It includes methods for running, pausing, and stopping the graph. The Filter Graph Manager implements this interface. (IMediaControl 接口提供了控制流经FilterGraph数据流的相关方法)
三。IMediaEventEx
    MSDN:
    The IMediaEventEx interface inherits the IMediaEvent interface, which contains methods for retrieving event notifications and for overriding the filter graph's default handling of events. IMediaEventEx adds methods that enable an application window to receive messages when events occur. Unlike IMediaEvent, this interface is not available through Automation, and therefore cannot be called directly from Microsoft® Visual Basic®.
(IMediaEventEx 继承自IMediaEvent，提供了从Filter Graph 管理器获取事件消息的方法)
四。IMediaSeeking Interface
    MSDN:
    The IMediaSeeking interface contains methods for seeking to a position within a stream, and for setting the playback rate. The Filter Graph Manager exposes this interface, and so do individual filters. Applications should query the Filter Graph Manager for the interface. (IMediaSeeking 提供了控制流的播放位置和播放速度的方法)

    IGraphBuilder    *m_pGraph;            
    IMediaControl    *m_pMediaControl;    
    IMediaEventEx    *m_pEvent;            
    IMediaSeeking    *m_pMediaSeeking;