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Keywords: mobile video surveillance system; video communication; QoS?
Keywords: mobile video survcilance system; video communicaTIon; QoS
The system supports one-to-multipoint IP multicast protocol (MulTIcast). In the network, a multipoint IP multicast address in the range of 224.0.0.0 to 239.255.255.255 can be defined. The advantage of multipoint multicast is that it can provide multiple images to many end users at the same time when the network scale is large. However, it should be noted that the reduction in the burden of the video source comes at the cost of increasing the burden on the router, which can be limited by the video distribution server. 
?
(1) Use Osprey-100 image acquisition card to realize multi-channel video capture. Under the condition that the performance of the encoder allows, multi-channel video transmission can be realized. (2) The video codec adopts MPEG4 coding standard, and cooperates with the network to process QoS. (3) The video flows through the WLAN based on IEEE802.11b and is transmitted through the UDP channel; due to the characteristics of the WLAN wireless channel, necessary flow control and QoS processing must be performed. (4) TCP feedback control and other data interaction through TCP channel interaction.
The system in Figure 2 consists of a video source, WLAN, and embedded mobile terminal. The video source can be divided into three modules: video capture, MPEG4 encoding, and wireless network transmission; embedded mobile terminals can be divided into: embedded mobile terminal, MPEG4 decoding, video reproduction three modules; WLAN and wireless network transmission module implementation information of both parties Interaction. ? 
The IPP library functions have multi-layer processing functions. For weaker functions, you can choose the bottom function of the IPP library; for stronger functions, you can choose a suitable high-level IPP function; the combination of the underlying "atomic" function can also replace the high-level function, and you can make changes if the algorithm requires This allows great flexibility in optimizing codec algorithms.
The specific optimization process of the system for coding and decoding is shown in Figure 3. According to the MPEG4 coding standard, the algorithm optimization is made with IPP at the Micro Block layer and Block layer, which achieves the purpose of greatly improving the efficiency of coding and decoding and improving the real-time performance of the system. ? 
4.2 CF wireless network card driver The focus of this work is on the rewriting and transplantation of wireless network card drivers. The ET? CWB1000 wireless CF network card based on Intersil Prism chipset (Version 3.0) can be selected and the Linux Spectum24 PCMCIA driver is used. As shown in Figure 5, the Linux network driver structure can be divided into four layers: device driver / network device layer, network protocol layer, and user application layer. The CF card is compatible with PCMCIA. The PCMCIA controller connects the card to the system bus, maps the card memory to the main I / O and memory window, and routes the interrupt generated by the card to the free processor interrupt line. 
Rate control is a technology to determine the transmission rate of video communication based on the available bandwidth of the network. During the system's adaptive network transmission process, the user end continuously detects the quality factors of the code stream transmission, the number of data packets sent, the number of lost data packets, and other statistical data, and then passes the information to the decision controller after processing; decision control The device controls the relevant components according to the corresponding strategy, completes the dynamic integration of the transmission code stream, and delivers the UDP transmission component of the sending end to complete the transmission of the multimedia stream; the browsing user end UDP receives the multimedia data and hands it to the subsequent network player for decoding and playing.
In order to realize bandwidth-based adaptive transmission, it is first necessary to perform dynamic detection and evaluation of the network bandwidth, and then adopt appropriate adjustment strategies to integrate the code stream. In the assessment of network status, the quality factors can be parameters such as packet loss rate, packet delay, and buffer space. The system uses a packet loss rate indicator. The receiving user terminal continuously measures the packet loss rate and sends it back to the sender via TCP. The decision controller compares the packet loss rate with the specified threshold to determine whether to increase or decrease the code rate. When the packet loss rate is greater than the upper threshold, the code stream rate is reduced; when the packet loss rate is less than the lower threshold, the code stream rate is increased. ?
Linear address mapping is used in the memory area to open up continuous memory blocks, which ensures the access speed of threads and effectively improves the decoding efficiency. ? 
Mobile video monitoring system based on WLAN
Mobile Supervisory System Based on WLAN
CHEN Qimei, YUYao, YANGZhou
(Nanjing University, Nanjing 210093, China)
Abstract: The paper gives the structure of the mobile video supervisory system under WLAN, describing its theory and procedures of the modules of video picture capture and represent, mobile transmission. In appendix, the soluTIon of QoS by using networks bandwidth adapTIverate control, ring buffer management, and daemon thread is disscussed.
Handheld mobile terminals can view remote digital video images through wireless networks and can be widely used in industrial control, community security, and news media services. This paper gives the technical solution of mobile video monitoring system based on IEEE802.11b based on wireless local area network WLAN and using Intel XScale architecture mobile terminal as its manifestation. ?
1.1 System architecture As shown in Figure 1, the mobile video surveillance system framework is shown in Figure 1. Network cameras located at multiple locations provide IP video sources through LAN or VPN. Mobile video terminals pass WLAN and after being authenticated by the video publishing server, they control the camera and view live images .
The video monitoring system adopts the master / slave (Client / Server) mode. The host end is the source of video streaming, based on the Windows operating system, completes the collection of original video images, compression coding and network data transmission; the slave end is the mobile terminal for playback, based on the embedded Linux operating system, completes network data reception and reverse traffic Control, PTZ remote control, upper user interface, video decoding and reproduction and other functions. The main technologies are:
2.1 Overview of video capture module This module completes the functions from analog video capture to capture YUV digital video stream. The frame grabber uses the YUV12 format to convert the analog video from multiple surveillance cameras to digital video signals in multiple formats. ?
2.2IPP optimized video codec IPP (Integrated Performance Primitive) is an important part of Intel's personal Internet user architecture. It provides function calls to applications on the operating system, while directly based on the hardware and traverses the operating system. The biggest advantage of IPP lies in the optimization of each function at the assembly level; taking measures according to the pipeline and bus characteristics of the CPU can improve the access speed and processing speed.
Video reproduction refers to the real-time playback of decompressed video signals on the LCD display of a mobile terminal. The player is required to interact with the display cache as quickly as possible. Frame buffer is the video memory in Linux embedded system. It is a component that provides display memory and display chip registers mapped from physical memory to process address space. The DMA channel should be used to constantly refresh the LCD buffer data. The implementation process is shown in Figure 4: After the frame buffer is mapped into the process address space, you can directly perform read and write operations, and the write operation can be immediately reflected on the LCD screen. The specific implementation is that by opening the / dev / fb0 device and address mapping through the mmap system call, the real-time video playback can be achieved by rewriting the buffer. The advantages of using frame buffer technology are high portability, low system resource occupancy, and stability to meet the needs of real-time video playback.
4.1 Wireless network construction The module uses the CF wireless network card, through the wireless local area network (WLAN) based on the IEEE802.11b standard, and the fixed wireless AP (Access Point access point), to construct a multi-point to multi-point mode to complete real-time video data transmission. The standard uses the ISM (Industrial Scientific Medical) wireless broadcast 2.45GHz frequency band, the maximum rate is 11Mbps, using direct sequence spread spectrum (DSSS) transmission technology, the AP covers a microcellular area with a radius of 100 ~ 500m.
1 Bandwidth adaptive flow control Real-time transmission of broadband video requires a certain network bandwidth. Especially when multiple users access the same video publishing server at the same time, it is easy to cause concurrent congestion bottlenecks. At this time, the output code stream needs to be dynamically adjusted to adapt to changes in network conditions. Figure 1 shows a transmission network structure based on bandwidth adaptation. A closed-loop negative feedback system is constructed between the streaming publishing server and the browsing user. The publishing server detects the network transmission status in real time, according to the relevant control strategy. Adjust the output stream code rate, so as to achieve the system's dynamic adaptation to bandwidth. The specific method: the destination end manages the ring buffer in real time according to the status of the received video stream buffer, trying to make the output rhythm uniform, and feedback the corresponding information in real time; the sending end adjusts the data flow sent according to the feedback information from the destination end, adjust The bandwidth of the media stream.
The multi-threading technology based on the ring buffer is shown in Figure 2, which achieves the purposes of continuous video, smooth code stream and saving memory space. In addition, with the help of the ring buffer and the mutex, the synchronization of threads can be completely solved.
In the mobile terminal program, a daemon thread is specially introduced to be responsible for traffic management. It is not a core part of the video program, but it independently and periodically performs monitoring tasks for each video thread in the background. The principle of the daemon thread is similar to the watchdog of the single-chip microcomputer. It regularly detects the running status and makes an analysis to determine the running status of each buffer and thread; it will handle the abnormal situation immediately to avoid thread collapse and screen freeze. The specific method is to use the polling interval (Poll Interval, PI) to determine the time to wait for polling, where PI is set to 1 second, and is responsible for monitoring the capacity of the ring buffer and the operation of each thread. When the detection buffer exceeds the threshold or a thread crashes, the thread will be maintained or restarted according to the running status of each thread.
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