基于AVS标准的解码算法研究与实现

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1、同济大学电子与信息工程学院博士学位论文基于AVS标准的解码算法研究与实现姓名：黄友文申请学位级别：博士专业：控制理论与控制工程指导教师：陈咏恩20081201摘要●去块效应滤波模块研究了AVS去块效应滤波器算法，采用片内RAM对滤波参考数据进行缓存，大大减少了SD蝴的带宽占用。同时，对存储结构进行了合理的安排，将前一个宏块滤波数据写入SDRAM的操作和当前宏块的滤波操作并行处理，加快了滤波处理速度。本文用Verilog硬件描述语言对上述解码模块进行了实现，采用软件仿真和FPGA验证相结合的方法完成了AVS解码器的验证，并构建了AVS视频流实时解

2、码系统。文中采用的系统架构和优化方法对其它视频解码芯片的设计具有一定的通用性。文章最后对进一步工作的方向进行了简要的讨论。关键词：AVS，视频解码芯片，可变长解码，帧内预测，运动补偿，去块滤波器IIAbstractABSTRACTNowadays，people’Slifeisgreatlyimproved．Thequalityoftraditionalanalogvideosignalisunabletomeettheneedsofpeople．Withtherapiddevelopmentofsignalprocessingtechnolog

3、y,large-scaleintegratedcircuits，computersandcommunicationtechnology,thevideotechnologyhasenteredtheturningpointfromanalogsignaltodigitalsignal．Digitalvideotechnologyismoreandmorewidelyapplied．VideodecoderchipistheCOrecomponentofdigitalvideoequipment,anditsdesignisthekeypoint

4、ofdigitalvideotechnology．Foralongtime，China'sdigitalvideoandaudioindustryhasbeensubjecttoforeignstandardsandCallnothelpbutspendalargesumofmoneytopayfortheroyalty．Inordertogetoutofthispredicament,theAudioandVideoCodingStandardWorkgroupofChinaallies、j~ritllmanydomesticenterpri

5、sestodeveloptheAVSstandard．Itisasecond-generationaudioandvideodecodingstandardandtakesadvantageoftheself-controltechnology．AVSstandardhasintellectualpropertyrights，SOitprovidesarareopportunityforthedevelopmentofChina'sdigitalaudioandvideoindustry．BasedontheAVSstandard,thefol

6、lowingaspectsaboutdecodingalgorithmandhardwaredesignalediscussedinthethesis，alsoeffectiveSOlutionsareproposed．Withthosesolutions，areal-timevideodecodersystemhasbeensetupinFPGA．●SystemarchitectureofAVSdecoderchip．BasedonthestudyofAVSdecodingalgorithm,areasonabledivisionofthed

7、ecodingmodulesisproposed．Acontroller、^ritllatwo-levelcontrollingmechanismissuggestedinthethesis．Bufferusageisgreatlyreduced、杭tllimprovementofhybridpipelining．●Variablelengthdecodingmodule．Thehardwaredesignofvariablelengthdecodingmodulehasbeenachieved,basingonthealgorithminAV

8、Sstandard．Thestoragestructureforthemappingtableisoptimized,SOthememoryunitu