【作者】 刘羽楠；

【导师】 国澄明；

【作者基本信息】 天津大学 ， 信号与信息处理， 2007， 硕士

【摘要】 AVS(Audio video coding standard)是我国自行制定的具有自主知识产权的数字音视频编解码技术标准,标志着我国在音视频编码领域也迈出了关键一步。AVS视频标准采用与H.264标准类似的技术框架,在性能上与H.264持平,在技术上更简洁。AVS系统标准采用了扩展MPEG-2 System的方案,有利于兼容已有的MPEG-2传输系统。AVS视频编码标准主要是为了适应数字电视广播、数字存储媒体、因特网流媒体、多媒体通信等应用中大尺寸、高质量的运动图像压缩的需要而制定。TMS320DM642数字媒体处理器(DM642)是德州仪器一款高性能的定点DSP。此款DSP的核拥有64个通用32位寄存器和8个带有VelociTI.2扩展功能的独立功能单元——2个乘法单元和6个算数逻辑单元(ALUs)。8个功能单元的VelociTI.2扩展功能包括一些新的指令,这些指令可以提升视频和图像处理的性能,增强VelociTI结构的并行度。DM642还采用了两级cache结构并拥有多种强大的外设。本论文主要介绍在基于TI TMS320DM642数字媒体处理器的硬件平台上实现AVS视频解码器。具备600Mhz处理能力的TMS320DM642代表着未来更高处理能力DSP的发展方向,非常适合于承担视频压缩处理这样高运算量和复杂度的工作。本论文的工作包括:对AVS视频标准和其参考代码RM52e框架的分析,AVS视频解码器由PC向DM642的移植和初步优化。目前,在DM642 CCS下仿真的AVS解码器每秒钟可以解码6至10帧CIF图像。更多还原

【Abstract】 Chinese advanced audio video coding standard (AVS) with independent intellectualproperty signs pivotal progress in audio video compression technology.The maintechnique of AVS video compression standard is similar to H.264,but morestraightforward with approximate efficiency.The AVS system standard extend theMPEG-2 system so that it is compatible with the existing MPEG-2 transportsystem.The AVS video compression standard is established to apply to thecompression of huge size and high quality moving picture in digital TVbroadcasting,digital storage media,internet streaming media, multimediacommunication.The TMS320DM642 Digital Media Processor (DM642) is a high performancefixed-point DSP from Texas Instruments. The DSP core processor has 64 generalpurpose 32-bit registers and eight highly independent functional units - twomultipliers and six arithmetic logic units (ALUs) with VelociTI.2 extensions. TheVelociTI.2 extensions in the eight functional units include new instructions toaccelerate the performance in video and imaging applications and extend theparallelism of the VelociTI architecture. The DM642 uses a two-level cache-basedarchitecture and has a powerful and diverse set of peripherals.The main task of this thesis is to implement AVS video DECODE software on theTexas Instruments’TMS320DM642 Digital Media Processor. With its 600Mhzprocessing power in production today and an aggressive process technology roadmapfor continued higher clock rates, this DSP is most suited to overcome the complexityand computational requirements.Our AVS decoder can provide 6-10 fps decoding performance for CIF resolutionvideo.更多还原