0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X|  CC   |M|     PT      |       sequence number         |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           timestamp                           |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           synchronization source (SSRC) identifier            |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
|            contributing source (CSRC) identifiers             |
|                             ....                              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|F|NRI|  Type   |
+---------------+

Table 2.  Example of NRI values for coded slices and coded slice
         data partitions of primary coded reference pictures

NAL Unit Type     Content of NAL Unit              NRI (binary)
----------------------------------------------------------------
 1              non-IDR coded slice                         10
 2              Coded slice data partition A                10
 3              Coded slice data partition B                01
 4              Coded slice data partition C                01

Table 1.  Summary of NAL unit types and the corresponding packet
          types

NAL Unit  Packet    Packet Type Name               Section
Type      Type
-------------------------------------------------------------
0        reserved                                     -
1-23     NAL unit  Single NAL unit packet             5.6
24       STAP-A    Single-time aggregation packet     5.7.1
25       STAP-B    Single-time aggregation packet     5.7.1
26       MTAP16    Multi-time aggregation packet      5.7.2
27       MTAP24    Multi-time aggregation packet      5.7.2
28       FU-A      Fragmentation unit                 5.8
29       FU-B      Fragmentation unit                 5.8
30-31    reserved                                     -

0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|F|NRI|  Type   |                                               |
+-+-+-+-+-+-+-+-+                                               |
|                                                               |
|               Bytes 2..n of a single NAL unit                 |
|                                                               |
|                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                               :...OPTIONAL RTP padding        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 2.  RTP payload format for single NAL unit packet

0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                :        NAL unit size          |               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+               |
|                                                               |
|                           NAL unit                            |
|                                                               |
|                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                               :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 6.  Structure for single-time aggregation unit

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                          RTP Header                           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |STAP-A NAL HDR |         NALU 1 Size           | NALU 1 HDR    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                         NALU 1 Data                           |
    :                                                               :
    +               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |               | NALU 2 Size                   | NALU 2 HDR    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                         NALU 2 Data                           |
    :                                                               :
    |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                               :...OPTIONAL RTP padding        |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 7.  An example of an RTP packet including an STAP-A
               containing two single-time aggregation units

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | FU indicator  |   FU header   |                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               |
    |                                                               |
    |                         FU payload                            |
    |                                                               |
    |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                               :...OPTIONAL RTP padding        |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 14.  RTP payload format for FU-A

       +---------------+
       |0|1|2|3|4|5|6|7|
       +-+-+-+-+-+-+-+-+
       |F|NRI|  Type   |
       +---------------+

      +---------------+
      |0|1|2|3|4|5|6|7|
      +-+-+-+-+-+-+-+-+
      |S|E|R|  Type   |
      +---------------+

// The packetization types that we support: single, aggregated, and fragmented.
enum H264PacketizationTypes {
  kH264SingleNalu,  // This packet contains a single NAL unit.
  kH264StapA,       // This packet contains STAP-A (single time
                    // aggregation) packets. If this packet has an
                    // associated NAL unit type, it'll be for the
                    // first such aggregated packet.
  kH264FuA,         // This packet contains a FU-A (fragmentation
                    // unit) packet, meaning it is a part of a frame
                    // that was too large to fit into a single packet.
};

// Packetization modes are defined in RFC 6184 section 6
// Due to the structure containing this being initialized with zeroes
// in some places, and mode 1 being default, mode 1 needs to have the value
// zero. https://crbug.com/webrtc/6803
enum class H264PacketizationMode {
  NonInterleaved = 0,  // Mode 1 - STAP-A, FU-A is allowed
  SingleNalUnit        // Mode 0 - only single NALU allowed
};

#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h> 
#include <string.h>

#include <iostream>
#include <string>
#include "rtputil.h"

#define BUFLEN 5120
#define PORT 8880
#define msg_trace(msg)  std::cout<<__FILE__<<","<<__LINE__<<": " << msg <<std::endl

using namespace std;


void exitWithMsg(const char *str)
{
    perror(str);
    exit(1);
}

int main(int argc, char *argv[])
{
    string rtpDumpFile = "rtp_dump.dat";
  int nPort =  PORT;
  int nCount = 10000;
  int nRet = 0;  
  if(argc > 2) {

     nPort = atoi(argv[1]);
     rtpDumpFile = argv[2];

     if(argc > 3)     nCount = atoi( argv[3]);

     msg_trace("To dump rtp packets to " << rtpDumpFile << " for " << nCount << " packets" << " from udp port " << nPort);
    } else {
    cout << "usage: " << argv[0] << "<port> <dump_file> [<dump_rtp_count>]" << endl;
    return -1;
  }

      msg_trace("--- udp server as rtp receiver ---");
    struct sockaddr_in my_addr, cli_addr;
    int sockfd; 
    socklen_t slen=sizeof(cli_addr);
    uint8_t buf[BUFLEN];

    if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
      exitWithMsg("socket error");
    else 
      printf("Server : Socket() successful\n");

    bzero(&my_addr, sizeof(my_addr));
    my_addr.sin_family = AF_INET;
    my_addr.sin_port = htons(nPort);
    my_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    if (::bind(sockfd, (struct sockaddr* ) &my_addr, sizeof(my_addr))==-1)
      exitWithMsg("bind error");
    else
      printf("Server : bind() successful\n");


    ofstream ofs;
        ofs.open (rtpDumpFile, std::ofstream::out | std::ofstream::app | std::ofstream::binary);

    int pktCount = 0;
    while(nCount > 0)
    {
        int pktSize = recvfrom(sockfd, buf, BUFLEN, 0, (struct sockaddr*)&cli_addr, &slen);
        if(pktSize == -1) {
            exitWithMsg("recvfrom()");
        }

        printf("The %d packet received %d from %s:%d ", ++pktCount, pktSize, inet_ntoa(cli_addr.sin_addr), ntohs(cli_addr.sin_port));
        if(pktSize > 12) {
          cout << dump_rtp_packet(buf,  pktSize) <<endl;
          dump_rtp_to_file(buf,  pktSize, &ofs);
          nCount --;
        }

    }

    close(sockfd);
    return 0;
}

git clone git@github.com:walterfan/webrtc_snippets.git
cd media
mkdir bld
cd bld
cmake ..
make
./udpserver 8888 dump.dat 1000

ffmpeg \
    -re \
    -i ../../obama_talk.mp4 \
    -an \
    -c:v copy \
    -f rtp \
    -sdp_file video.sdp \
    "rtp://127.0.0.1:5004"

#include <stdio.h>
#include <stdint.h>
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <assert.h>
#include <unistd.h>


#include "MediaUtil.h"

using namespace std;

int main(int argc, char *argv[])
{
  msg_trace("--- Walter test program ---");

  int nRet = 0;  
  if(argc > 1) {
     msg_trace("--- read media file ---");
     string media_file = argv[1];
     MediaFileParser* pParser = new MediaFileParser(media_file);
     pParser->parse_stream();
     delete pParser;
     msg_trace("--- byebye ---");
  } else {
     msg_trace("Usage: " << argv[0] << " <media_file>");
  }
  return nRet;
}

git clone git@github.com:walterfan/webrtc_snippets.git
cd video
mkdir bld
cd bld
cmake ..
make
./media_parser ../../media/bld/dump.dat |more

# ,size, pt, ssrc, m, sn, ts, nalType, subNalType, start, end
1, 1472, 96, 1352798098, 0, 2156, 704725956, 28, 5, 1, 0,
2, 1472, 96, 1352798098, 0, 2157, 704725956, 28, 5, 0, 0,
3, 1472, 96, 1352798098, 0, 2158, 704725956, 28, 5, 0, 0,
4, 1472, 96, 1352798098, 0, 2159, 704725956, 28, 5, 0, 0,
5, 1472, 96, 1352798098, 0, 2160, 704725956, 28, 5, 0, 0,
6, 1472, 96, 1352798098, 0, 2161, 704725956, 28, 5, 0, 0,
7, 1472, 96, 1352798098, 0, 2162, 704725956, 28, 5, 0, 0,
8, 1472, 96, 1352798098, 0, 2163, 704725956, 28, 5, 0, 0,
9, 1472, 96, 1352798098, 0, 2164, 704725956, 28, 5, 0, 0,
10, 1472, 96, 1352798098, 0, 2165, 704725956, 28, 5, 0, 0,
11, 1472, 96, 1352798098, 0, 2166, 704725956, 28, 5, 0, 0,
12, 1472, 96, 1352798098, 0, 2167, 704725956, 28, 5, 0, 0,
13, 1472, 96, 1352798098, 0, 2168, 704725956, 28, 5, 0, 0,
14, 1472, 96, 1352798098, 0, 2169, 704725956, 28, 5, 0, 0,
15, 1260, 96, 1352798098, 1, 2170, 704725956, 28, 5, 0, 1,
16, 1472, 96, 1352798098, 0, 2171, 704729710, 28, 1, 1, 0,
17, 1472, 96, 1352798098, 0, 2172, 704729710, 28, 1, 0, 0,