Using Jrtplib (RTP) to transfer a video file (2)

In the previous article we introduced some basic knowledge of the RTP protocol, below we describe how to use jrtplib this library to transmit H264 encoding.

JRTP transmission: OK, here is the example I wrote about sending H264 packets using JRTP, which can be explained in detail. The sending side can also receive RTCP packets sent by the receiving end. #define  MAX_RTP_PKT_LENGTH 1360#define H264                96bool checkerror (int rtperr); class CRTPSender : Public rtpsession{public:crtpsender (void), ~crtpsender (void);p Rotected:void onapppacket (RTCPAPPPacket  *apppacket,const rtptime &receivetime,const rtpaddress *senderaddress); void  onbyepacket (Rtpsourcedata *srcdat); Void onbyetimeout (rtpsourcedata *srcdat);p ublic:void  sendh264nalu (Unsigned char* m_h264buf,int buflen); void setparamsforsendingh264 ();}; Bool checkerror (Int rtperr) {if  (rtperr < 0) {std::cout<< "ERROR: " < <rtpgeterrorstring (Rtperr) <<std::endl;return false;} Return true;} Crtpsender::crtpsender (void) {}crtpsender::~crtpsender (void) {}void crtpsender::onapppaCket (rtcpapppacket *apppacket,const rtptime &receivetime,const rtpaddress * senderaddress) {//Receive Rtcp app data std::cout<< "got rtcp packet from: " << senderaddress<<std::endl;std::cout<< "got rtcp subtype: " <<apppacket-> Getsubtype () <<std::endl;std::cout<< "got rtcp data: " << (char *) apppacket- >getappdata () <<std::endl;return ;} Void crtpsender::sendh264nalu (Unsigned char* m_h264buf,int buflen)  {unsigned  char *psendbuf; //send data pointer psendbuf = m_h264buf;//remove preamble 0x000001  or 0x00000001//if (  0x01 == m_h264buf[2] )//{//psendbuf = &m_h264buf[3];//buflen -= 3;//}// else//{//psendbuf = &m_h264buf[4];//buflen -= 4;//}char sendbuf[1430];    //sent data buffer memset (sendbuf,0,1430); int status;  printf ("Send packet&nbSp;length %d \n ", Buflen);if  ( buflen <= MAX_RTP_PKT_LENGTH ) {   memcpy (Sendbuf,psendbuf,buflen);   status = this->sendpacket (void *) SendBuf, Buflen);    checkerror (status);}   else if (buflen > max_rtp_pkt_length) {//Set flag bit mark is 0this->setdefaultmark (false) //printf ("buflen = %d\n", buflen);//Gets the number of RTP packets that need to be max_rtp_pkt_length bytes long to send int k=0,l=0;   k = buflen / MAX_RTP_PKT_LENGTH;l = buflen % MAX_RTP_PKT_LENGTH; INT&NBSP;T=0;//is currently sending the first few shard RTP packets char nalheader = psendbuf[0]; // nalu  Header A?¤while ( t < k | |   ( t==k && l>0 )  )   {  if (  (0 == t  )  | |   ( t<k && 0!=t )  )//first package to the last package {/*sendbuf[0] =  (nalheader  & 0x60) |28;&NBSP;&NBsp;sendbuf[1] =  (nalheader & 0x1f);if  ( 0 == t ) {sendbuf[1]  |= 0x80;} memcpy (sendbuf+2,&psendbuf[t*max_rtp_pkt_length],max_rtp_pkt_length);status = this-> Sendpacket ((void *) sendbuf,max_rtp_pkt_length+2); */memcpy (Sendbuf,&psendbuf[t*max_rtp_pkt_length],max _rtp_pkt_length); Status = this->sendpacket ((void *) sendbuf,max_rtp_pkt_length); CheckError (status); t++;} Last Bag Else if (  ( k==t && l>0 )  | |   ( t==  (k-1)  && l==0 )) {//Set flag bit mark is 1this->setdefaultmark (true); int  iSendLen;if  ( l > 0) {isendlen = buflen - t*max_rtp_pkt_length ;} elseisendlen = max_rtp_pkt_length;//sendbuf[0] =  (nalheader & 0x60) |28;   //sendbuf[1] =  (nalheader & 0x1f);//sendbuf[1] |= 0x40;//memcpy ( sendbuf+2,&psendbuf[t*Max_rtp_pkt_length],isendlen);//status = this->sendpacket ((void *) sendbuf,iSendLen+2);    memcpy (Sendbuf,&psendbuf[t*max_rtp_pkt_length],isendlen);status = this-> Sendpacket ((void *) sendbuf,isendlen); CheckError (status); t++;}}} void crtpsender::setparamsforsendingh264 () {this->setdefaultpayloadtype (H264);//Set Transfer type this-> Setdefaultmark (TRUE);//Set bit this->settimestampunit (1.0/9000.0);  //Set sampling interval this-> Setdefaulttimestampincrement (3600);//set timestamp increase interval}void crtpsender::onbyepacket (rtpsourcedata *srcdat) {} Void crtpsender::onbyetimeout (Rtpsourcedata *srcdat) {}main.cpp   transmission after encoding in the previous blog # define  SSRC           100#define DEST_IP_STR     "192.168.1.252" #define  dest_port     1234#define base_port      2222int inal   = 0;x264_nal_t* pnals&nbsP;= null;void setrtpparams (Crtpsender& sess,uint32_t destip,uint16_t destport, Uint16_t baseport) {INT&NBSP;STATUS;&NBSP;&NBSP;//RTP+RTCP Library initializes the socket environment rtpudpv4transmissionparams  Transparams; Rtpsessionparams sessparams;sessparams. Setowntimestampunit (1.0/9000.0);  //timestamp Unit sessparams. Setacceptownpackets (TRUE);//receive the packet sessparams that you sent. SETUSEPREDEFINEDSSRC (TRUE);   //settings use pre-defined ssrcsessparams.setpredefinedssrc (SSRC);      //defines ssrc   transparams. Setportbase (Baseport); status = sess. Create (Sessparams,&transparams);   checkerror (status);d Estip = ntohl (Destip); RTPIPV4ADDRESS&NBSP;ADDR (Destip,destport); status = sess. Adddestination (addr); CheckError (status);//Set parameter//sess for sending H264 package. SetParamsForSendingH264 ();} Bool initsocket () {int error; word versionrequested; wsadata wsadata; Versionrequested=makeword (2,2); Error=wsastartup (versionrequested,&wsadata);  //start Winsock2if (error!=0) {printf ("error:start winsock failed!\n"); return false;} Else{if (Lobyte (wsadata.wversion)!=2| | Hibyte (wsadata.whighversion)!=2) {printf ("error:the version is winsock2!\n"); WSACleanup (); return false;}} Return true;} Void closesocket (crtpsender sess) {//send a bye packet away from the session for up to a second timeout without sending Sess.byedestroy (Rtptime (3,0), 0,0); WSACleanup ();} Int main (INT&NBSP;ARGC,&NBSP;CHAR**&NBSP;ARGV) {initsocket (); crtpsender sender;string destip_str =  "127.0.0.1"; uint32_t dest_ip = inet_ Addr (Destip_str.c_str ()); Setrtpparams (sender,dest_ip,dest_port,base_port); sender. SetParamsForSendingH264 ();//...x264 setting parameters, see the previous blog for (int i = 0; i < nframes  ; i++ ) {//read one frame read_frame_y4m (ppicin, (hnd_t*) y4m_hnd,i); if ( i ==0 ) ppicin->i_ pts = i;elseppicin->i_pts = i - 1;//encoding int frame_size = x264_ Encoder_encode (Px264handle, &pnals,&inal,ppicin,ppicout); if (frame_size >0) {for  (int i = 0; i  < inal; ++i) {//writes encoded data to file T//fwrite (Pnals[i].p_payload, 1, pnals[i].i_payload,  pfile);//Send encoded file sender. Sendh264nalu (Pnals[i].p_payload,pnals[i].i_payload); Rtptime::wait (Rtptime (1,0));}}  closesocket (sender);//some cleanup work ...}

Using Jrtplib (RTP) to transfer a video file (2)