针对全高清车载乘客信息系统设计与实现中 的编解码、总线接口和带宽等相关问题进行讨论，着重 对比分析在司机室服务器采用 VDPAU 进行编解码的优 势，以及在客室采用 DM368 嵌入式编解码带来的性能 提高。讨论总线传输接口中传统 VGA 传输方式在全高 清车载 PIS 系统环境下带来的相应问题，并提出采用以 太网和 DVI 的接口而不再使用分屏器的有效解决方案。 针对不同编码格式下的视频带宽，给出实验测试结果。

This paper compares and discusses the codec, the bus interface and the problems related to bandwidth in design and implementation of the full high-definition vehicle Passenger Information System (PIS), with emphasis on the comparison and analysis of the advantages of applying Video Decode and Presentation API for Unix (VDPAU) to the cab server and the performance improvement by applying the DM368 embedded codec to the passenger compartment. Meanwhile, problems brought about by using traditional Video Graphics Array (VGA) transmission under full high-definition vehicle PIS in the bus transfer interface are discussed. By using Ethernet and Digital Visual Interface (DVI) interfaces instead of the sub-screen device, these problems are effectively solved. Finally, experimental results for different video bandwidths using different encoding formats are obtained.

U231． 7

中央高校基本科研业务项目( 2009YJS001)