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the relationship between rtp packet and frame

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  • cherishren
    Junior Member
    Junior Member
    • Feb 2013
    • 1

    the relationship between rtp packet and frame

    The sequence is IPPP... I only want to lose the second frame, so I revise the rtp_loss.c in JM 18.4 as follows. I only read the second packet to the buffer, but not write it to the output file.

    The problem is that I do not know the relationship between packet and frame. I can make the second packet lost, but not the second frame.



    Code:
    // rtp_loss.cpp : Defines the entry point for the console application.
    //
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <memory.h>
    #ifdef WIN32
    #include <Winsock2.h>
    #else
    #include <netinet/in.h>
    #endif
    
    void print_usage(char *argv [])
    {
      printf ("Usage: %s input_file output_file loss_percent <keep_leading_packets>\n", argv[0]);
      exit (-1);
    }
    
    
    int main(int argc, char* argv[])
    {
      unsigned int bufsize, pacno=0;
      unsigned char buf[65000];
      int i, intime;
      FILE *fr;                                // file for reading
      FILE *fw;                                // file for writing
    
      
      if ((argc != 4) && (argc != 5))
      {
        print_usage (argv);
      }
    
      if (NULL == (fr = fopen (argv[1], "rb")))
      {
        printf ("%s: cannot open H.264 packet file %s for reading\n", argv[0], argv[1]);
        return -2;
      }
    
      if (NULL == (fw = fopen (argv[2], "wb")))
      {
        printf ("%s: cannot open H.264 packet file %s for reading\n", argv[0], argv[1]);
        fclose (fr);
        return -2;
      }
    
    
      if (argc==5)
      {
        for (i=0; i< atoi (argv[4]); i++)
        {
          if (4 != fread (&bufsize, 1, 4, fr))
            return 0;
          if (4 != fread (&intime, 1, 4, fr))
          {
            printf ("Panic, cannot read timestamp, old software version file?\n");
            return -1;
          }
          if (bufsize != fread (buf, 1, bufsize, fr))
          {
            printf ("Problems while reading buffer, exit\n");
            return -3;
          }
    
          if (4 != fwrite (&bufsize, 1, 4, fw))
          {
            printf ("Problems while writing buffer size, exit\n");
            return -1;
          }
          if (4 != fwrite (&intime, 1, 4, fw))
          {
            printf ("Problems while writing timestamp, exit\n");
            return -1;
          }
          if (bufsize != fwrite (buf, 1, bufsize, fw))
          {
            printf ("Problems while writing buffer, exit\n");
            return -3;
          }
          pacno++;
        }
      }
       
          if (4 != fread (&bufsize, 1, 4, fr))
            return 0;
          if (4 != fread (&intime, 1, 4, fr))
          {
            printf ("Panic, cannot read timestamp, old software version file?\n");
            return -1;
          }
          if (bufsize != fread (buf, 1, bufsize, fr))
          {
            printf ("Problems while reading buffer, exit\n");
            return -3;
          }
      printf ("lost packet #%d\n", pacno);
      pacno++;
    
    	for (i=2; ; i++)
        {
          if (4 != fread (&bufsize, 1, 4, fr))
            return 0;
          if (4 != fread (&intime, 1, 4, fr))
          {
            printf ("Panic, cannot read timestamp, old software version file?\n");
            return -1;
          }
          if (bufsize != fread (buf, 1, bufsize, fr))
          {
            printf ("Problems while reading buffer, exit\n");
            return -3;
          }
    
          if (4 != fwrite (&bufsize, 1, 4, fw))
          {
            printf ("Problems while writing buffer size, exit\n");
            return -1;
          }
          if (4 != fwrite (&intime, 1, 4, fw))
          {
            printf ("Problems while writing timestamp, exit\n");
            return -1;
          }
          if (bufsize != fwrite (buf, 1, bufsize, fw))
          {
            printf ("Problems while writing buffer, exit\n");
            return -3;
          }
          pacno++;
        }
     }
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