IDvdControl2 VS IMediaControl

本文详细对比了IDvdControl2和IMediaControl接口中停止和暂停方法的区别。前者更改DVD读取状态但不影响滤波图状态,后者则改变滤波图状态而不影响DVD命令。一般建议使用IMediaControl的方法,因其延迟较小。

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The DVD Navigator has methods to stop and pause playback. These methods are similar — but not identical — to the Stop and Pause methods in IMediaControl. Here is the difference between them:

  • The IDvdControl2 methods change what the DVD Navigator reads from the disk. They do not change the state of the graph.
  • The IMediaControl methods change the state of the graph. They do not change what the DVD Navigator reads from the disk. (There is one important exception, explained in the next section, related to the Stop method.)

For example, IDvdControl2::Pause method issues the Annex J "Pause_On" command, but does not pause the filter graph. The IMediaControl::Pause method, on the other hand, pauses the graph but does not issue any DVD command.

In general, use the IMediaControl::Pause and Stop methods instead of the corresponding IDvdControl2 methods. The IMediaControl methods have very small latencies, whereas the IDvdControl2 methods can have up to two seconds of latency.

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