数字电视实时编码教学实验系统的研究与实现

上海交通大学硕士学位论文数字电视实时编码教学实验系统的研究与实现姓名：徐驰申请学位级别：硕士专业：电子与通信工程指导教师：方向忠;张芩20090401IIIMPEG-2MPEG-4IPTVMPEGMIPSCPUMPEG-2/4LinuxMIPSPALNTSCMPEG-4(PSTS)UDP/IPLinuxMPEG-4MPEG-2/4H.264HDIIILinuxMPEG-4MIPSlinuxABSTRACTIVRESEARCHANDACHIEVEMENTOFAREAL-TIMEDIGITALVIDEOENCODINGSYSTEMFORCOLLEGEEXPERIMENTSUBJECTABSTRACTTheseyears,thereisabigrevolutioninvideocommunicationdomain.Obviouslytheprogressofdigitalvideoisfaster.Videocommunicationhasimprovedfromanalogsignalstodigitalsignals.Videomeetings,digitalTVandhighdefinitionTVareinfluencingourdailylifemoreandmore.ThewholedigitalTVbroadcastsystembringstherevolutionarychangesfromvideocreatingtovideotransmissionandbroadcasting.Insuchcondition,therearenewdemandsforcollegestudentsmajoredinvideocommunicationdiscipline.Soitisnecessaryforacademiestoaddnewcoursesaboutvideotheory.Moreandmorecollegesandacademiesestablisheddigitalvideocoursesoutsidethepaleoftraditionalvideocourses,sostudentscankeepupwithlatestvideoencodingtheoriesandtechnology.Butthesecoursesaremoretheoryandlackofexperiments,andalsolackofexperimentequipments.Studentswouldfeelthatitishardtounderstandtheseuninterestingtheories.Thepurposeofthispaperistoresearchareal-timedigitalvideoencodingsystemasanexperimentequipmentfordigitalvideodisciplines.Inthisobject,weusedtheconceptofMPEG-2/4encodingstandardsandIPTV,sothelearnerscanunderstandthetheoriesaboutdigitalTVandnetworkTV,andknowtheprinciplesaboutvideoencodinganddigitalvideotransports.ThecommonMPEG-2/4seriesreal-timeencodingsystemswhichwecangetfrommarketsareoftenprofessionalandexpensive.Thedisadvantageaboutthesesystemsishardtoknowtheencodingprogress,soit’shardforstudents’experiments.Theotherdisadvantageistheexpensivepricesobstructthelargeamountofpurchase.Inthispaper,giveaschemewhichcanrealizelowcost,ABSTRACTVreal-time,highqualityvideoencodingsystemwithMIPSCPUandencodingchip.ThesystemappliesembeddedLinuxsystemandreceivesNTSCorPALanalogvideo/audiosignalsfromvideo/audioinputinterface,encodingvideo/audiosignalstoMPEG-2/4transmitstreamsorprogramstreamswithspecialencodechip,encapsulatesinUDP/IPpacketsandtransmitthroughEthernetinterface.Inthispaperweintroducethedesignofhardwarearchitecturefirst.Throughanalyzingeverysub-moduleandpopulardesigns,choosethefittestschemeforthesystemwewanttoget.Second,developthesoftwaresystembaseonthehardwarearchitecture,includescompilingtheembeddedLinuxoperationsystem,compilingtheencodingapplications,compilingthesystemcontrolsoftware,etc.WhatwewanttoshowisthemainprincipleofMPEGseriesencoding,sowefocusonthemainprinciplesintheprocessofthissystemdevelopmentandgiveupthelatestdesigns,forexample,H.264andhighdefinition.Thereforewereducethecostofdevelopmentandutilization.Asweusethemodulesdesigns,everymodulecanbechangedparameters,usercaneasychangetheresultsofencoding.Thelowcostofhardwarearchitecturereducetheprocurementcostbycollegeschools,andreducethecostofopeningexperimentcoursesfordigitalvideoencoding.Inaddition,itiseasytoshowthewholeprocessesabouttheencodingbymodulesdesignandsothissystemcanbegoodusedincollegedigitalvideoexperimentcourses.Itwillhaveagoodmarketprospect.Keywords:MPEG-4EncodingMIPSEmbeddedLinux69AACAdvancedAudioCodingAC3DolbySurroundAudioCoding-33ADCAnalogtoDigitalConverterAPIApplicationProgrammingInterfaceCODECCoderandDecoderCPUCentralProcessingUnitDACDigitaltoAnalogConverterDCTDiscreteCosineTransformDSPDigitalSignalProcessorFlashFlashH.264H.264ITU-TISO/IECHDHighDefinitionHDTVHighDefinitionTelevisionISIntegratedInterchipSoundIPInternetProtocolIPTVInternetProtocolTelevisionMIPSMicroprocessorwithoutinterlockedpipedstagesMPEGMovingPictureExpertsGroupMUXMultiplexerNTSCNationalTelevisionSystemCommitteePALPhaseAlternatingLinePCIPeripheralComponentInterconnectPSProgramStreamMPEG-2RISCReducedInstructionSetComputingCPUS/P-DIFSony/PhilipsDigitalInterFaceSDRAMSynchronousDynamicRandomAccessMemorySDTVStandardDefinitionTelevisionTCPTransportControlProtocolTSTransportStreamMPEG-2UDPUserDatagramProtocolUSBUniversalSerialBusVLCVariableLengthCoding20096292009629200962911.1MPEG-1MPEG1994MPEG-2MPEG-23100ISO/IEC13818MPEG-2MPEG-1MPEG-2SDTVHDTVMPEG-2MPEGMPEG-4MPEG-4200010MPEG-2(Content-basedscalability)()MPEG-4MPEG-1MPEG-2MPEG-4()2-1A/DA/DD/AD/A2-1Fig.2-1Digitaltelevisonsystemprinciplediagram5200Mbps64QAM8PSKIEEEMPEGISO/IEC11172(MPEG-1)ISO/IEC13818(MPEG-2)ISO/IEC14496MPEG-42.1.2A/D(AnalogtoDigital)D/A(DigitaltoAnalog)A/DD/AA/DD/AA/DD/AMPEG-2MPEG-46MPEG-1TSTS(PSPES)TSMPEG-2TSIPTCP/UDPMPEG-2MPEG-4A/DD/AA/DD/AA/DD/AA/DD/ATCP/UDPIP2.1.37,2.22.2.1CPUMPEG-2/4TCP/UDP/IPMPEG(PSTS)PAL/NTSCPAL/NTSCI/OIDE8MPEG-4MPEG-1/2H.264HDMPEG-4ISO/IEC14496[1]1.2.3.4.CPUEncoderSDRAMSDRAMFlashPCIIDEPCII²C32223210I²S20323232321642-2Fig.2-2SystemprinciplediagramMPEG-4[2]9MPEG-4PCI2-22.2.22-2CPUCPUPCIflashSDRAMPCIPCIIDETCP/IPUDP/IPIDECPUARMMIPSPowerPCRISCCPURISCReducedInstructionSetComputingRISC1.2./LOAD/STORERISCLOAD/STORE3.104.5.6.7.8.9.ARMAdvancedRISCMachinesRISCARMRISC/DSPARMOEMARMARMRISC30ARMIntelIBMLGN