媒体基金会演讲时钟？ [英] Media Foundation Presentation Clock?

问题描述

您好



我正在创建一个媒体基础接收器来处理avi文件。我正在尝试修改本书附带的一些源代码：由Anton Polinger开发Microsoft Media Foundation应用程序。



我是Windows Media的新手基础。



我正在使用继承自以下的CAviSink类：

IMFFinalizableMediaSink，IMFClockStateSink，IMFAsyncCallback



但是，我需要为接收器设置演示时钟。我不知道怎么回事。我试过了

 IMFPresentationClock ** ppPresentationClock = NULL; 
 
 MFCreatePresentationClock（ppPresentationClock）; 
 
 mySink.SetPresentationClock（* ppPresentationClock）; 

但ppPresentationClock为空。



这可能是完全错误的做法。但是，我能找到的只是媒体基础上非常详细的信息，例如什么是演示时钟，但没有指导如何创建一个。



我想知道是否有人可以给我一个指针，以帮助我找到我的方式所有这些令人困惑的文档...



非常感谢...

解决方案

你需要了解指针用C ++指针。没有看到文档，我怀疑你的代码应该是：

 IMFPresentationClock * pPresentationClock = NULL; 
 
 MFCreatePresentationClock（& pPresentationClock）; 
 
 mySink.SetPresentationClock（* pPresentationClock）; 
  //  或者甚至 
 mySink.SetPresentationClock（pPresentationClock）; 

Hi there

I''m creating a media foundation sink to process an avi file. I''m trying to modify some source code that comes with the book: Developing Microsoft Media Foundation Applications by Anton Polinger.

I''m am new to windows media foundation.

I''m using a class CAviSink that inherits from :
IMFFinalizableMediaSink, IMFClockStateSink,IMFAsyncCallback

However, I need to set the presentation clock for the sink. I''m not sure how to go about this. I''ve tried

IMFPresentationClock **ppPresentationClock = NULL;
   
MFCreatePresentationClock(ppPresentationClock);
   
mySink.SetPresentationClock(*ppPresentationClock);

but ppPresentationClock is null.

This is probably the completely wrong way to do this. However, all I can find is very detailed information on the media foundation e.g. what the presentation clock does but no pointers on the basics of how to create one.

I was wondering if someone could give me a pointer to help me find my way through all this confusing docs...

Many thanks...

解决方案

You need to understand pointers to pointers in C++. Without seeing the documentation, I suspect your code should read:

IMFPresentationClock *pPresentationClock = NULL;
   
MFCreatePresentationClock(&pPresentationClock);

mySink.SetPresentationClock(*pPresentationClock);
// or maybe even
mySink.SetPresentationClock(pPresentationClock);

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