mjpg-streamer摄像头远程传输UVC

  mjpg-streamer摄像头远程传输UVC


1 下载源码 

mjpg-streamer的源码地址  https://github.com/codewithpassion/mjpg-streamer

嵌入式 mini2440版 https://github.com/vfonov/mjpg-streamer

2 编译 

  mjpg-streamermake

运行

export LD_LIBRARY_PATH="$(pwd)"

./mjpg_streamer -i "./input_uvc.so -y" -o "./output_ http.so -w ./www" 


电脑端 用火狐浏览器 输入  
http://192.168.1.17:8080/?action=stream

其中 192.168.1.17根据实际情况输入

2源码分析 

从main开始 位于Mjpg_streamer.c 
getopt_long_only:解析输入的参数
global.in.init = dlsym(global.in.handle, "input_init"); // 让 global.in.init = input_init dlsym 取动态对象地址
input_init ( input_uvc.c )
--> if (init_videoIn(videoIn, dev, width, height, fps, format, 1) < 0)
        init_videoIn(V4l2uvc.c (plugins\input_uvc) 
            init_v4l2

global.in.run = dlsym(global.in.handle, "input_run");
 input_run( input_uvc.c )
     -->pthread_create(&cam, 0, cam_thread, NULL);
        void *cam_thread( void *arg ) 
             uvcGrab(videoIn) 
            if (videoIn->formatIn == V4L2_PIX_FMT_YUYV)
                  pglobal->size = compress_yuyv_to_jpeg(videoIn, pglobal->buf, videoIn->framesizeIn, gquality);
else
  {
   pglobal->size = memcpy_picture(pglobal->buf, videoIn->tmpbuffer, videoIn->buf.bytesused);
  }

global.out[i].init = dlsym(global.out[i].handle, "output_init"); 
  output_init(   output_http.c)
 servers[param->id].id = param->id;
 servers[param->id].pglobal = param->global;
 servers[param->id].conf.port = port;
 servers[param->id].conf.credentials = credentials;
 servers[param->id].conf.www_folder = www_folder;
 servers[param->id].conf.nocommands = nocommands;

global.out[i].stop = dlsym(global.out[i].handle, "output_stop");
output_stop
pthread_cancel(servers[id].threadID);



global.out[i].run = dlsym(global.out[i].handle, "output_run"); 

    output_run( output_http.c )
         pthread_create(&(servers[id].threadID), NULL, server_thread, &(servers[id])); // 创建一个线程 server_thread
         pthread_detach(servers[id].threadID); // 等待线程结束,以便回收

             server_thread (Httpd.c\plugins\output_http)  
                  ->  client_thread
                        if ( strstr(buffer, "GET /?action=snapshot") != NULL )
 {
  req.type = A_SNAPSHOT; 
 }
 else if ( strstr(buffer, "GET /?action=stream") != NULL )
 {
  req.type = A_STREAM; 
 }
 else if ( strstr(buffer, "GET /?action=command") != NULL )
 {
                            req.type = A_COMMAND;
                    }

        switch ( req.type ){
case A_SNAPSHOT:
   DBG("Request for snapshot\n");
   send_snapshot(lcfd.fd);
   break;
  case A_STREAM:
   DBG("Request for stream\n");
   send_stream(lcfd.fd);
   break;
}


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