（decoder如圖2所示。其中:2.字幕碼流解碼出來，進而將解碼出來的字幕交給subDispManager進行管理。Decoder字幕解碼器internaldecoder，idxsub字幕解碼器。流進行解碼，將解碼出來的字幕存放到subDispManager模塊進行管理。Idxsub是一種比較特殊的字幕，嚴格上說它是一種外掛字幕，但與普通的外掛字幕不4.了兩個變量validSubNum（有效的字幕數目）nEmptySubNum（空閑的字幕buffer數目）來控制著6buffer，解碼器每解碼出來一條字幕時，validSubNum1，nEmptySubNum1request一條字幕時，validSubNum1request到的字幕flush到字幕庫時，nEmptySubNum加1.12探測字幕文件的基本信息(輸入為文件句柄3456789如果外掛字幕，應用程序首先調用ProbeSubtitleStreamProbeSubtitleStreamFdFlushSubtitleItem將圖像Buffer歸還解碼器。不斷地調用RequestSubtitleItem函數獲取字幕，并將顯示完的字幕通過調用FlushSubtitleItem函數還回給字幕庫。下文詳細介紹各個APIintProbeSubtitleStream(constchar*int*pStreamCount)strFilePath：字幕文件的路徑，成功：0失敗：-1intProbeSubtitleStreamFd(intintoffset,intlen,SubtitleStreamInfo**int*Fd:字幕文件句柄len：有效數據的長度0失?。?1SubtitleDecoder*成功則返回解碼器指針SubtitleDecoder*；失敗則返回NULL失敗則返回NULL； voidResetSubtitleDecoder(SubtitleDecoder*p,int64_t通過無intDecodeSubtitleStream(SubtitleDecoder*SubtitleStreamDataInfo*通過 2 1 0：解碼ok 1SDECODE_RESULT_NO_FRAME_BUFFER4：無FRAMEBUFFER對于內嵌字幕，因為字幕碼流是從parserSubtitleItem*NextSubtitleItem(SubtitleDecoder*通過該字幕在字幕顯示隊列即FRAMEBUFFERSubtitleItem*RequestSubtitleItem(SubtitleDecoder*通過無voidFlushSubtitleItem(SubtitleDecoder*p,SubtitleItem*通過無無unsigned外掛字幕的文件內容的offset5.2字幕顯示的unsignedunsignedbufferbuffert當前這一筆字幕碼流的當前這一筆字幕碼流的當前這一筆字幕碼流的UnsignedUnsignedUnsignedUnsigned空閑的bufferUnsigned當前字幕的當前字幕的中間subdispbufdvdsubDivxA或DivxB針外掛字幕："sub","srt","smi", "txt","ssa","aqt","jss","ass","vsf","tts","stl","zeg","ovr","dks","lrc","sbt","vkt","pjs","mpl","scr","psb","asc","s2k","sst","son","ssts",內嵌字幕：ThisdocumentistheoriginalworkandcopyrightedpropertyofAllwinnerTechnology(“Allwinner”).ReproductioninwholeorinpartmustobtainthewrittenapprovalofAllwinnerandgiveclearacknowledgementtothecopyrightowner.TheinformationfurnishedbyAllwinnerisbelievedtobeaccurateandreliable.Allwinnerreservestherighttomakechangesincircuitdesignand/orspecificationsatanytimewithoutnotice.Allwinnerdoesnotassumeanyresponsibilityandliabilityforitsuse.Norforanyinfringementsofpatentsorotherrightsofthethirdpartieswhichmayresultfromitsuse.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAllwinner.Thisdatasheetneitherstatesnorimplieswarrantyofanykind,includingfitnessforanyparticularapplication.7.ThisdocumentistheoriginalworkandcopyrightedpropertyofAllwinnerTechnology(“Allwinner”).ReproductioninwholeorinpartmustobtainthewrittenapprovalofAllwinnerandgiveclearacknowledgementtothecopyrightowner.TheinformationfurnishedbyAllwinnerisbelievedtobeaccurateandreliable.Allwinnerreservestherighttomakechangesincircuitdesignand/orspecificationsatanytimewithoutnotice.Allwinnerdoesnotassumeanyresponsibilityandliabilityforitsuse.Norforanyinfringementsofpatentsorotherrightsofthethirdpartieswhichmayresultfromitsuse.Nolicenseisgrantedbyimplicationorothe