网页显示摄像头数据的方法---基于web video server-Toy模板网

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1. 背景：

在ros系统中有发布摄像头的相关驱动rgb数据，需求端需要将rgb数据可以直接在网页上去显示。

问题解决：

web_video_server功能包，相关链接：

web_video_server - ROS Wiki

2. 下载，安装和编译：

由于我们项目使用的是ros2系统，所以下载web video server在ros2的分支，可以根据自己的实际需求来下载：

git clone https://github.com/RobotWebTools/web_video_server.git

下载之后可以查看分支，并且编译代码：

cindy@ubuntu:~/web_video_server$ git branch
  develop
* ros2
cindy@ubuntu:~/web_video_server$ colcon build --packages-select web_video_server
Starting >>> web_video_server
--- stderr: web_video_server                         
CMake Error at CMakeLists.txt:6 (find_package):
  By not providing "Findasync_web_server_cpp.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "async_web_server_cpp", but CMake did not find one.

  Could not find a package configuration file provided by
  "async_web_server_cpp" with any of the following names:

    async_web_server_cppConfig.cmake
    async_web_server_cpp-config.cmake

  Add the installation prefix of "async_web_server_cpp" to CMAKE_PREFIX_PATH
  or set "async_web_server_cpp_DIR" to a directory containing one of the
  above files.  If "async_web_server_cpp" provides a separate development
  package or SDK, be sure it has been installed.


---
Failed   <<< web_video_server [1.22s, exited with code 1]

Summary: 0 packages finished [1.49s]
  1 package failed: web_video_server
  1 package had stderr output: web_video_server
cindy@ubuntu:~/web_video_server$

可以看到编译的过程中无法找到async_web_server_cpp的数据包：

Could not find a package configuration file provided by
"async_web_server_cpp"

3. async_web_server_cpp的下载，安装

后面要安装async_web_server_cpp的相关服务包：

代码下载：

git clone https://github.com/fkie/async_web_server_cpp.git

cindy@ubuntu:~/ros2_ws$ git clone https://github.com/fkie/async_web_server_cpp.git
Cloning into 'async_web_server_cpp'...
remote: Enumerating objects: 594, done.
remote: Counting objects: 100% (110/110), done.
remote: Compressing objects: 100% (64/64), done.
remote: Total 594 (delta 52), reused 76 (delta 35), pack-reused 484
Receiving objects: 100% (594/594), 113.65 KiB | 440.00 KiB/s, done.
Resolving deltas: 100% (358/358), done.

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