基于DM8148的嵌入式网络视频服务器设计

摘要

For building high-performance embedded network video server,a scalable embedded network video server with high performance based on DM8148 multi-core processor was proposed.First of all,video processing subsystem (VPSS)was called to complete video capture using V4L2 (video4linux2)and codec engine was used to achieve the necessary processing of DSP algo-rithms for video.On this basis,the H. 264 video coding was accomplished by calling high definition video co-processor (HDVICP2 )through OpenMax.At last,the compressed video data were stored into the SD card and sent to the PC client through the real-time transport protocol (RTP),in which way the real-time video capture,encoding and transmission were achieved.In the system testing part,720P HD video sources and the open source VLC player based on SDP (session description protocol)at PC side were used.Test results show that the image is clear and the real-time is high,which can meet the needs of real-time monitoring.%为构建高性能的嵌入式网络视频服务器，设计一种基于DM8148多核处理器的高性能、可扩展的嵌入式网络视频服务器。通过V4L2（video4linux2）驱动调用视频处理子系统（VPSS）完成视频的采集，采用编解码引擎（codec engine）实现DSP算法对视频进行的必要处理；在此基础上通过OpenMax调用高清视频协处理器（HDVICP2）完成视频的H．264编码，将压缩后的视频数据存储至SD卡并通过实时传输协议（RTP）发送至PC机客户端，实现视频的实时采集、编码、传输。在系统测试中采用720P高清视频源，在PC端使用基于SDP协议的VLC开源播放器播放，测试结果表明，图像较清晰，实时性较高，能满足实时监控的需求。