RTP_h264打包源码.doc

classCH264_RTP_PACK#defineRTP_VERSION2typedefstructNAL_msg_sbooleoFrame;unsignedchartype;/NALtypeunsignedchar*start;/pointertofirstlocationinthesendbufferunsignedchar*end;/pointertolastlocationinsendbufferunsignedlongsize;NAL_MSG_t;typedefstruct/LITTLE_ENDIANunsignedshortcc:4; /*CSRCcount*/unsignedshortx:1; /*headerextensionflag*/unsignedshortp:1; /*paddingflag*/unsignedshortv:2; /*packettype*/unsignedshortpt:7; /*payloadtype*/unsignedshortm:1; /*markerbit*/unsignedshortseq; /*sequencenumber*/unsignedlongts; /*timestamp*/unsignedlongssrc;/*synchronizationsource*/rtp_hdr_t;typedefstructtagRTP_INFONAL_MSG_tnal; /NALinformationrtp_hdr_trtp_hdr;/RTPheaderisassembledhereinthdr_len;/lengthofRTPheaderunsignedchar*pRTP; /pointertowhereRTPpackethasbeemassembledunsignedchar*start;/pointertostartofpayloadunsignedchar*end; /pointertoendofpayloadunsignedints_bit; /bitintheFUheaderunsignedinte_bit; /bitintheFUheaderboolFU_flag;/fragmentedNALUnitflagRTP_INFO;public:CH264_RTP_PACK(unsignedlongH264SSRC,unsignedcharH264PAYLOADTYPE=96,unsignedshortMAXRTPPACKSIZE=1472)m_MAXRTPPACKSIZE=MAXRTPPACKSIZE;if(m_MAXRTPPACKSIZE10000)m_MAXRTPPACKSIZE=10000;if(m_MAXRTPPACKSIZE50)m_MAXRTPPACKSIZE=50;memset(&m_RTP_Info,0,sizeof(m_RTP_Info);m_RTP_Info.rtp_hdr.pt=H264PAYLOADTYPE;m_RTP_Info.rtp_hdr.ssrc=H264SSRC;m_RTP_Info.rtp_hdr.v=RTP_VERSION;m_RTP_Info.rtp_hdr.seq=0;CH264_RTP_PACK(void)/传入Set的数据必须是一个完整的NAL,起始码为0x00000001。/起始码之前至少预留10个字节，以避免内存COPY操作。/打包完成后，原缓冲区内的数据被破坏。boolSet(unsignedchar*NAL_Buf,unsignedlongNAL_Size,unsignedlongTime_Stamp,boolEnd_Of_Frame)unsignedlongstartcode=StartCode(NAL_Buf);if(startcode!=0x01000000)returnfalse;inttype=NAL_Buf4&0x1f;if(type12)returnfalse;m_RTP_Info.nal.start=NAL_Buf;m_RTP_Info.nal.size=NAL_Size;m_RTP_Info.nal.eoFrame=End_Of_Frame;m_RTP_Info.nal.type=m_RTP_Info.nal.start4;m_RTP_Info.nal.end=m_RTP_Info.nal.start+m_RTP_Info.nal.size;m_RTP_Info.rtp_hdr.ts=Time_Stamp;m_RTP_Info.nal.start+=4;/skipthesyncwordif(m_RTP_Info.nal.size+7)m_MAXRTPPACKSIZE)m_RTP_Info.FU_flag=true;m_RTP_Info.s_bit=1;m_RTP_Info.e_bit=0;m_RTP_Info.nal.start+=1;/skipNALheaderelsem_RTP_Info.FU_flag=false;m_RTP_Info.s_bit=m_RTP_Info.e_bit=0;m_RTP_Info.start=m_RTP_Info.end=m_RTP_Info.nal.start;m_bBeginNAL=true;returntrue;/循环调用Get获取RTP包，直到返回值为NULLunsignedchar*Get(unsignedshort*pPacketSize)if(m_RTP_Info.end=m_RTP_Info.nal.end)*pPacketSize=0;returnNULL;if(m_bBeginNAL)m_bBeginNAL=false;elsem_RTP_Info.start=m_RTP_Info.end;/continuewiththenextRTP-FUpacketintbytesLeft=m_RTP_Info.nal.end-m_RTP_Info.start;intmaxSize=m_MAXRTPPACKSIZE-12; /sizeof(basicrtpheader)=12bytesif(m_RTP_Info.FU_flag)maxSize-=2;if(bytesLeftmaxSize)/ limit RTP packetsize to 1472 bytesm_RTP_Info.end=m_RTP_Info.start+maxSize;elsem_RTP_Info.end=m_RTP_Info.start+bytesLeft;if(m_RTP_Info.FU_flag)/multiplepacketNALsliceif(m_RTP_Info.end=m_RTP_Info.nal.end)m_RTP_Info.e_bit=1;/ should be set at EofFramem_RTP_Info.rtp_hdr.m=m_RTP_Info.nal.eoFrame?1:0;if(m_RTP_Info.FU_flag&!m_RTP_Info.e_bit) m_RTP_Info.rtp_hdr.m=0;m_RTP_Info.rtp_hdr.seq+;unsignedchar*cp=m_RTP_Info.start;cp-=(m_RTP_Info.FU_flag?14:12);m_RTP_Info.pRTP=cp;unsignedchar*cp2=(unsignedchar*)&m_RTP_Info.rtp_hdr;cp0=cp20;cp1=cp21;cp2=(m_RTP_Info.rtp_hdr.seq8)&0xff;cp3=m_RTP_Info.rtp_hdr.seq&0xff;cp4=(m_RTP_Info.rtp_hdr.ts24)&0xff;cp5=(m_RTP_Info.rtp_hdr.ts16)&0xff;cp6=(m_RTP_Info.rtp_hdr.ts8)&0xff;cp7=m_RTP_Info.rtp_hdr.ts&0xff;cp8=(m_RTP_Info.rtp_hdr.ssrc24)&0xff;cp9=(m_RTP_Info.rtp_hdr.ssrc16)&0xff;cp10=(m_RTP_Info.rtp_hdr.ssrc8)&0xff;cp11=m_RTP_Info.rtp_hdr.ssrc&0xff;m_RTP_Info.hdr_len=12;/*!*nTheFUindicatoroctethasthefollowingformat:*n*n+-+*nMSB|0|1|2|3|4|5|6|7|LSB*n+-+-+-+-+-+-+-+-+*n|F|NRI|Type|*n+-+*n*nTheFUheaderhasthefollowingformat:*n*n+-+*n|0|1|2|3|4|5|6|7|*n+-+-+-+-+-+-+-+-+*n|S|E|R|Type|*n+-+*/if(m_RTP_Info.FU_flag)/FUindicatorF|NRI|Typecp12=(m_RTP_Info.nal.type&0xe0)|28;/Typeis28forFU_A/FUheaderS|E|R|Typecp13=(m_RTP_Info.s_bit7)|(m_RTP_Info.e_bit6)|(m_RTP_Info.nal.type&0x1f);/R=0,mustbeignoredbyreceiverm_RTP_Info.s_bit=m_RTP_Info.e_bit=0;m_RTP_Info.hdr_len=14;m_RTP_Info.start=&cpm_RTP_Info.hdr_len;/newstartofpayload*pPacketSize=m_RTP_Info.hdr_len+(m_RTP_Info.end-m_RTP_Info.start);returnm_RTP_Info.pRTP;private:unsignedintStartCode(unsignedchar*cp)unsignedintd32;d32=cp3;d32=8;d32|=cp2;d32=8;d32|=cp1;d32=8;d32|=cp0;returnd32;private:RTP_INFOm_RTP_Info;boolm_bBeginNAL;unsignedshortm_