用虚拟Buffer状态控制MPEG-2系统层复用

阐述了ＭＰＥＧ－２系统层单节目传送流的复用，分析了Ｔ－ＳＴＤ模型对传送流交织结构的要求，据此提出了基于虚拟缓存状态控制的复用算法．该算法通过建立一个虚拟系统层目标解码器（Ｔ－ＳＴＤ），与复用端组成一个闭合的反馈环路，利用Ｔ－ＳＴＤ缓存器占有率反馈控制复用器，保证所产生传送流具有合理结构，并符合ＭＰＥＧ－２系统层标准对Ｔ－ＳＴＤ各缓存器不产生上溢和下溢的规定．实验结果表明，传送包结构交织均匀、合理．

Virtual Buffer Control Strategy for MPEG-2 System Layer Multiplexing

It described single program transport stream multiplexing of MPEG 2 system layer, analysed conditions defined in T STD model that the transport stream should satisfy, and then proposed single program transport stream multiplexing algorithm based on virtual buffer status. In the algorithm, a virtual system layer T STD was established to produce a feedback cycle with multiplexer. The multiplexer was feed backward controlled by the T STD buffer fullness to ensure that the transport stream had rational construction and met the criterion which did not make the T STD buffer to either overflow or underflow. The experimental results show that the interleave constructions of transport stream packets are uniform and rational.