ReportofSummerWork宋惟農(nóng)2008/09/021OutlineIPTVstudyZigBeecontrollerforIPTV2IPTVstudyWhat’sIPTVSolutionofQoSSolutionofQoEChannelzapping3What’sIPTVInternetProtocolTelevision(IPTV):TheKillerApplicationfortheNext-GenerationInternet,IEEECommunicationsMagazine,November20074What’sIPTVIPTVadvantage:HighvideoqualityTwowaycommunication.IPTVtechnicalchallenge:QoS(QualityofService)BandwidthofInternetislimited.QoE(QualityofExperience)Channelzappingistooslow.5IPTVstudyWhat’sIPTVSolutionofQoSSolutionofQoEChannelzapping6SolutionofQoSMulticastItneedsonlyoneflowinbackboneformultipleuserstowatchthesamechannel.NotfullysupporteduntilIPv6.AdmissioncontrolOnlypermittedusercanwatchIPTV.類似現(xiàn)在有線電視不可以自己偷接，付多少錢才能看多少。7IPTVstudyWhat’sIPTVSolutionofQoSSolutionofQoEChannelzapping8SolutionofQoEFastchannelzappingFastChannelSwitchingForHybridUnicast/BroadcastMobileTelevision,BroadbandMultimediaSystemsandBroadcasting,2008IEEEInternationalSymposiumon,pp.1-4,March312008-April220089IPTVstudyWhat’sIPTVSolutionofQoSSolutionofQoEChannelzapping10ChannelzappingTraditionalchannelzappingNewchannelzappingwithnewcodingmethodforMPEG4OurchannelzappingwithdifferentbitrateMyplan11Traditionalchannelzapping1.Stopcurrentchannel2.Askfornewchannel3.WaitfornextI-frame(MPEG4only)4.Waitforbuffering5.Playnewchannel12ChannelzappingTraditionalchannelzappingNewchannelzappingwithnewcodingmethodforMPEG4OurchannelzappingwithdifferentbitrateMyplan13NewchannelzappingwithnewcodingmethodforMPEG4I-frame(intraframe):baseimageP-frame(otherframe):differencefrombaseimageMethod:AskforlastI-frame.ServerencodecurrentframeasI-frame.AnotherflowtotransmitI-frameofallchannels.Advantage:About2~3secondsfaster5seconds->2~3seconds.Disadvantage:Privateencoderanddecoder14ChannelzappingTraditionalchannelzappingNewchannelzappingwithnewcodingmethodforMPEG4OurchannelzappingwithdifferentbitrateMyplan15OurchannelzappingwithdifferentbitrateTransmitneighbororfavoritechannelswithlowerbitratesimultaneously.Advantage:0zappingtime!(Bufferswitchonly)Disadvantage:AdditionalbandwidthUserscanonlychoosespecificchannels.Extraadvantage:Servedifferentkindofdevicesimultaneously.Ex:HandhelddeviceandTV,bigscreenandsmallscreen16ChannelzappingTraditionalchannelzappingNewchannelzappingwithnewcodingmethodforMPEG4OurchannelzappingwithdifferentbitrateMyplan17MyplanServer:VLCClient:QtWhyQtnotVLC?TheAPIofVLCisnotfulldeveloped,wecan’tcontroltheactionoflowerlevel.Qtcan.18OutlineIPTVstudyZigBeecontrollerforIPTV19ZigBeecontrollerforIPTVComputerCOMportTransceiverController20ZigBeecontrollerforIPTV主畫面Pre上一個選單Play播放Pause停止播放Next下一個選單21ZigBeecontrollerforIPTV音量調(diào)整Pre上一個選單+大聲-小聲Next下一個選單22ZigBeecontrollerforIPTV頻道選擇Pre上一個選單+下一臺-上一臺Next下一個選單23ZigBeecontrollerforIPTV畫面調(diào)整Pre上一個選單Type畫面類型Single,Double,QuadScreen主控畫面切換