如果对象有效,则此属性为 true。
当对象的所有者(请参阅 AudioSampleProvider.owner)将其释放时,该对象变为无效。但是,在调用进行时无法销毁提供程序,因此销毁期间不会出现竞争条件。
当播放停止时,VideoPlayer 会释放所有提供程序。
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