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针对地铁列车乘客信息系统中多媒体平台多路高清视频输出的需求以及通用计算机在列车多媒体平台应用的缺陷,提出了一种基于TMS320DM8168的嵌入式解决方案。该方案能实现3路1 080 p每秒60帧视频的H.264,MPEG-4等编解码,并在本地以HDMI或VGA接口输出显示。压缩后的高清视频码流通过以太网传输至客室以提供乘客所需信息。重点介绍了该方案的硬件电路设计,包括音视频模块、内存模块、电源模块和外设接口模块。方案使用Linux操作系统,在软件设计部分介绍了开发环境的搭建和软件平台的移植。
Aimed at the demand of multi-channel high-definition video output of multimedia platform in subway train passenger information system and the defects of general computer application in train multimedia platform, an embedded solution based on TMS320DM8168 is proposed. The program can achieve 3 Road 1 080 p 60 video per second H.264, MPEG-4 encoding and decoding, and in the local HDMI or VGA interface output display. The compressed HD video stream is transmitted over the Ethernet to the guest room to provide the information the passenger needs. The hardware circuit design of the scheme is mainly introduced, including audio and video module, memory module, power module and peripheral interface module. Program using the Linux operating system, introduced in the software design of the development environment and software platform for the transplant.