Controller接口定义了基本的状态和控制机制，使得实现它的对象可以对基于时间的媒体(time-based media)进行控制，播放或捕获。Controller接口定义了一个媒体controller经历的不同状态，并提供了一种机制控制这些状态的转换。
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预先录制好的纯音频：为预先录制好的纯音频内容提供一个用于展示等价信息的基于时间的媒体替代方案。
Prerecorded video-only: Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.
预先录制好的纯视频：为预先录制好的纯音频内容提供一个用于展示等价信息的的基于时间的媒体或者音轨的替代方案。
Prerecorded video-only: Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.
以零售商为例，他可以决定啤酒库存量是多少。这不仅仅基于过去的销售记录，还可以基于天气预报，社会媒体上的聚会闲聊以及体育比赛的时间表。
A retailer, for instance, might decide how much beer to stock based not just on previous sales records, but also on weather forecasts, party chatter on social media and schedules for sports matches.
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