完成了基本的端对端的视频音频传输，使用directshow视频采集，支持无驱动摄像头-Have completed a basic end of the video and audio transmission, the use of directshow video capture, support non-driven camera

DirectShow读取摄像头数据,读取摄像头数据，获得采集的摄像头-DirectShow read the camera data