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1、Z.Weietal.:ImplementationofH.264onMobileDevice1109ImplementationofH.264onMobileDeviceZhenyuWei,StudentMember,IEEE,KaiLamTangandKingN.Ngan,Fellow,IEEEAbstract—ThispaperintroducestheperformanceandDuetothehighcomplexityofH.264andtheconstraintsoftechnicalfeaturesofthenewgenerationinternationa
2、lvideocomputationresourceofthemobiledevice,itisachallengingcodingstandardH.264,aswellasdiscussestheworktoachievearealtimecodeconembeddedprocessor.implementationandoptimizationofH.264onmobiledevice.WeusedmanytechniquesandproposedsomeefficientOurworkistoimplementH.264BaselineProfileencodera
3、lgorithmstoreducethecomputationalloadoftheencoderanddecoderonanHPIPAQhx4700PDA(PersonalDigitalanddecoder,includingsystemoptimization,algorithmAssistant)whichhasapowerfulembeddedprocessoroptimizationandtheinstructionoptimizationetc.ForPXA27xproducedbyIntel.Byusingthewayofsystemalgorithmopt
4、imization,afastintegerpixelandsub-pixeloptimization,algorithmoptimizationandinstructionmotionestimationalgorithmaswellasanefficientmodeoptimization,wehavesuccessfullyimplementedtheH.264decisionmethodareproposed.Theycanspeedupencodingcodeconmobiledeviceandmadegreatimprovementintimedrastica
5、lly.Forinstructionoptimizationpart,wetermsofcodingspeedwithverylittleperformanceadequatelyusedtheabundantWirelessMMXinstructions[7]degradationintermsofPSNRandbit-rate.ExperimentalwhichareprovidedbyIntelPXA27xProcessorandareveryresultsshowthatthespeedofourcodecincreasessuitableformultimedi
6、aprocessing.Byusingthesesignificantlyafteroptimization(muchmorethan25framesoptimizationmethods,arealtimeH.264encoderispersecond).IntheQCIF(176×144)resolution,ourcodecimplementedonthemobiledevice.Sincethereisadecodingcanruninrealtimeonthemobiledevice.BasedonourmoduleinH.264encoder,itisvery
7、easytoachieveareal-optimizedreal-timeH.264codec,awirelessvideotimedecoderbasedonouroptimizedencoder.Finally,areal-conferencingsystemisimplementedandisdescribedinthistimeH.264basedvideoconferencingsystemisimplementedpaper.onthemobiledevice.Therestofpaperisorganizedas
