The Design And Implementation Of An Embedded Streammedia IP Access Module

Along with the continuous development of the network technique and the high performance processors, the video monitoring system (VMS) has come through the first generation VMS which focuses on transport and process the simulative signals, and the second generation VMS which is marked with the simulative video transmission and personal compute (PC) based video processing. Currently, a new generation VMS which takes the Internet as the carrier, and attaches most importance to the networked video serve emerges on the stage. It shows the characteristic of exploiting server to effectively compress the simulative data directly, delivering the video picture and the control signals with streaming format to the network connecting end. The users get the video and audio data by the client software or the Internet Explorer in real-time.On the base of analyzing the different underlying structure of VMSs, we aim at designing the connection module inside the Streammedia VMS, and studying how to improve the IP connection of the Streammedia VMS, accordingly to research and implement a stable VMS which has the complete independent intelligent property right. The main contents are as follows:(1) By summarizing the present development status of the VMS, the whole structure of the Streammedia VMS and the hardware blue print of IP connection module are proposed. The key techniques involved to the system are analyzed.(2) Completing the software designing of the streaming IP connection module, and transplant the uClinux as its operating system. The boot loader of the uClinux is modified and the kernel is tailored. The material frame includes the master control program, video and audio transporting program and assistant management program. A serial of kernel modules are also developed to support the IP connection.(3) The Streammedia IP connection module has been developed according to the projects requirements. It supports multiple protocols such as UDP/IP, TCP/IP, ARP, FTP, DHCP, HTTP and SMTP. It also realizes the real-time playing, the cooperative alarming and the remote updating function. After a long time test and evaluation, the system becomes more perfect and runs more stable.