NeHe OpenGL Lesson35 – Playing AVI Files In OpenGL

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原文链接：http://www.cnblogs.com/open-coder/archive/2012/08/23/2651829.html

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#c/c++ #开发工具

本文介绍了一种利用OpenGL在Windows环境下播放AVI文件的方法。作者通过调用Windows原生的AVI播放库，而非自行解析AVI文件，简化了流程。主要步骤包括：打开AVI文件流、创建位图对象并设置到设备上下文、抓取帧动画数据并绘制到当前设备上下文中，最后更新纹理对象内容。

This sample shows us how to play AVI files with OpenGL. In addition to get AVI files frame animation images, the author used windows native AVI playing library instead of re-writing his own AVI file parsing and frame image decoding features.

Main Idea

The main workflow like following:
1) Open a AVI file stream;
2) Create a bitmap object, and set this bitmap object to the current device context;
3) grab a frame animation data, and draw current frame into current device context with DrawDibDraw function;
4) after the step 3), the current frame image already in the Bitmap object. So update the texture object’s content with glTexSubImage2D function in your current bind texture object;

The AVI files playing support on windows are:

#include <vfw.h>
...
#pragma comment( lib, "vfw32.lib" )

Something More

This sample also tells us some other funny stuffs:
1) Bitmap save color as little Endian, but OpenGL use big Endian. That is why need to flip the bitmap data;
2) A good example about what we should do if we want to add some assembly into our c or c++ source code;
3) When we need to update a texture on fly, we could update texture data only. No need to release the old one and create a new one.

The full source code could be checked from here.

转载于:https://www.cnblogs.com/open-coder/archive/2012/08/23/2651829.html