基于TMS320C6416的MPEG-2/MPEG-4视频流转码器设计与实现

Design and Implementation of MPEG-2/MPEG-4 Video Stream Transcoding Based on TMS320C6416

目前的视频流转码大致可以分为空域(像素域)转码和压缩域(DCT域)转码两种方法。针对目前最流行的MPEG-2和MPEG-4两个压缩编码标准,采用级联空域转码方案,并且基于TMS320C6416 DSP芯片,探讨了MPEG-2/MPEG-4视频流转码的硬件实现方法。在设计中,通过PCI消息机制,解决了DSP与PC机的数据传输“瓶颈”问题,同时合理分配存储器,并采取各种优化技术,近实时地实现了MPEG视频流转码。

The technology of video stream transcoding can be divided into two types： spatial domain （pixel-domain） and compressed domain （DCT-domain）. Focussing on the two most popular compression encoding standards： MPEG-2/MPEG-4, a cascaded space-domain transcoding scheme is adopted in this paper. Basing on TMS320C6416 DSP, the implementation method of MPEG-2/MPEG-4 video stream transcoding on hardware is discussed in this paper. In the design, through solving the bottleneck problem of high-speed data exchange between PC and DSP by PCI mode, distributing memory reasonably, adopting various optimization techniques, a near real-time implementation of MPEG video stream transcoding is achieved.