如何使用IMFMediaEngine接口从磁盘加载视频？ [英] How to load the video from the disk using IMFMediaEngine interface ?
问题描述
我正在尝试使用
IMFMediaEngine-> Load（）方法，我们需要从磁盘文件中读取视频。你可以帮我看看如何在不使用UWP API的情况下从磁盘读取它 - 我可以使用UWF文件流类。使用UWP的示例代码低于 -
I am trying to use IMFMediaEngine->Load() method, for that we need to read video from the disk file. Can you please help me on how to read it from the disk without using UWP APIs - I am able to do with UWF File Stream class. The Sample code using UWP is below -
HRESULT hr = S_OK;
ComPtr<IMFByteStream> spMFByteStream = nullptr;
hr = MFCreateMFByteStreamOnStreamEx((IUnknown*)streamHandle, &spMFByteStream);
hr = m_mediaEngineEx->SetSourceFromByteStream(spMFByteStream.Get(), m_bstrURL))
我想我需要使用IMFByteStream接口，然后使用
MFBeginCreateFunction 。但不确定如何实现它。
I think I need to Use IMFByteStream Interface, then use
MFBeginCreateFunction. But not sure entirely how to implement it.
注意：我无法为此问题找到合适的类别。技术上说它应该属于Media Foundation Programming Interfaces。
Note: I couldn't able to find a suitable category for this question. Technically Speaking it should belong Media Foundation Programming Interfaces.
推荐答案
您好AjayRamesh，
Hi AjayRamesh,
感谢您在此发布。
>>我想我需要使用IMFByteStream接口，然后使用 MFBeginCreateFunction。但不确定如何实现它。
注意：我无法找到合适的类别对于这个问题。技术上说它应该属于Media Foundation Programming Interfaces。
当MFBeginCreateFile请求完成时，将调用回调对象的IMFAsyncCallback :: Invoke方法。然后回调对象应该调用MFEndCreateFile函数来获取指向字节流的指针。
When the MFBeginCreateFile request is completed, the callback object's IMFAsyncCallback::Invoke method is called. The callback object should then call the MFEndCreateFile function to get a pointer to the byte stream.
以下是一些指南和示例供您参考。
Here are some guides and samples for you as a reference.
https://msdn.microsoft.com/en -us / library / windows / desktop / ms697062（v = vs.85）.aspx
希望这可以为您提供帮助。
Hope this could be help of you.
最诚挚的问候，
Baron Bi
Baron Bi
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