【學習筆記】obs-studio 編譯

1.下載源碼

因為現在最新的obs-studio 只支持VS2019了，我沒安裝VS2019，安裝的是VS2015，查看wiki記錄

https://github.com/obsproject/obs-studio/wiki/Install-Instructions/0ddc3265c810eec18238dcc996856558c6f88bb7

為最后一版說明，支持VS2015的

通過時間比對，對應的是obs-studio 24.0

2.編譯環境軟件需求

obs-studio在WIndows平台編譯使用的是CMake，具體的內容在Wiki中也有說明：
Requirements for building OBS on windows
Development packages of FFmpeg, x264, and cURL.

• Pre-built windows dependencies for VS2015 and VS2017 can be found here 如下是VS2015和VS2017的預編譯依賴庫:
  • VS2015: https://obsproject.com/downloads/dependencies2015.zip
  • VS2017: https://obsproject.com/downloads/dependencies2017.zip
• Qt5 (minimum version of 5.9 if you're using VS2017)（如果使用VS2017 Qt最少是5.9）
• cmake 的windows版本
• Visual Studio 2015 or Visual Studio 2017 (latest updates recommended) 推薦使用 vs205或者vs2017

3.編譯

• Run cmake-gui, and set the following fields:
  • In "where is the source code", enter in the repo directory (example: D:/obs).
  • In "where to build the binaries", enter the repo directory path with the 'build' subdirectory (example: D:/obs/build).
  • 就是配置下圖的路徑
    
• Set the following variables in cmake-gui (alternatively, you can set them as Windows Environment Variables):
  • DepsPath (Path to the include for all dependencies, not including Qt.).
    • An example path if you extracted the dependancies .zip to c:\obs-deps would be:
      • c:\obs-deps\win32\include
      • c:\obs-deps\win64\include
  • If you wish to specify both 32 and 64 bit dependencies (for multi-arch building), you can use DepsPath32 and DepsPath64 to their respective include folders.
  • 配置下cmke中的變量DepsPath，根據自己的路徑調整，如D:/obs-studio-24.0.0/dependencies2015/win32/include，要編譯32位的就選win32，編譯64的就選win64，想2種都編譯就增加DepsPath32和DepsPath64
    
• QTDIR (Path to Qt build base directory. GUI is built by default. Set the cmake boolean variable DISABLE_UI to TRUE if you don't want the GUI and this is no longer required. Can be optionally suffixed with 32 or 64 to specify target arch).
  • NOTE: Make sure to download Qt 5.X.X prebuilt components for your version of MSVC (64 or 32 bit).
  • Example Qt directories you would use here if you installed Qt5 to D:\Qt would usually look something like this:
    • (32bit) QTDIR=D:\Qt\5.8\msvc2017
    • (64bit) QTDIR64=D:\Qt\5.8\msvc2017_64
  • 配置下cmke中的變量QTDIR，我用的是Qt5.9.8
    
• 點 Cmake 程序 界面的Configure，選擇 Visual Studio 14 2015
• 點 Generate，生成VS工程

4.生成結果

成功36個，失敗2個

切換到錯誤列表

• KSAUDIO_SPEAKER_2POINT1這個宏，定義在其他文件中，復制過來到嚴重性win-wasapi.cpp 文件中即可#define KSAUDIO_SPEAKER_2POINT1 (KSAUDIO_SPEAKER_STEREO|SPEAKER_LOW_FREQUENCY)
• obs-studio-24.0.0\UI\window-basic-preview.cpp(930): error C2719: “transform”: 要求 16 對齊的形參將不被對齊 ，將
  static bool IntersectBox(matrix4 transform, float x1, float x2, float y1,
  float y2)
  函數修改為
  static bool IntersectBox(matrix4& transform, float x1, float x2, float y1,
  float y2)

重新編譯

5.接下來研究下這個是什么，怎么實現的

6.

大致看了下，是D3D實現的或者openGL，這2個我都沒接觸過，還要先學習這個，這個效果應該叫多窗口疊加。