基于TMS320DM6446的USB数字视频采集显示技术的设计与实现

Design and realization of USB digital video capturing and displaying based on TMS320DM6446

提出了一种基于DM6446处理器通过USB接口采集数字视频并通过模拟输出接口实现视频显示的设计方案。通过采用V4L2编程框架和采集数据的YUV格式转换,实现了USB Camera到LCD的动态数字视频显示。实验测试结果表明,软硬件工作状况良好,完全能满足系统需求,既弥补了单纯ARM核处理器在实时性和高吞吐量上能力较差的缺点,也弥补了单纯FPGA核处理器在任务调度和网络协议等问题上比较复杂的不足,使得整个系统在数字视频处理领域更加高效实用。而且设计方案也克服了以往对DM6446视频开发平台基本用来处理模拟视频输入的局限性,这对其他嵌入式产品的开发具有较大的参考意义。

Based on the Davinci technology,TI offers TMS320DM6446 which is an embedded chip supporting with high performance.It＇s widely used in the field of video surveillance for its highly integrated hardware and advantage of audio and video algorithms.Through consulting a large number of references,we find its application is limited in analog video field in the past,this can＇t adapt to the rapid development of digital video technology today,therefore,USB digital video capturing and analog LCD displaying based on DM6446 is designed in this paper.Dynamic digital video displaying from USB camera to analog LCD is realized with the V4L2 Programming framework and YUV format conversion.Experimental test results showed that the hardware and software worked well on the target board,and this design can provide a reference for the development of other embedded product.