main.c

一个264程序在NS2下面的仿真程序。非常好用

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <malloc.h>
#include "global.h"

nal *head, *current, *tail;

/* Table and index */
int table[10][2],idx=0;

int main(int argc, char* argv[])

{
  unsigned int bufsize, pacno=0;;
  unsigned char buf[65000];
  int i, intime, prio = 2, currentslice, todrop, totalsize, pktsize;
  FILE *f,*f2;
  unsigned char *pt;
  float pkttime,bitrate;
  
  parsefile(argv[1]);

  if (NULL == (f = fopen (bitstream, "rb")))
  {
    printf ("%s: cannot open H.26L packet file %s for reading\n", argv[0], argv[1]);
    return -2;
  }

  f2 = fopen (outputfile,"w");

  head = NULL;
  tail = head;

  currentframe = -1;
  currentslice = 0;
  totalsize = 0;


  while (1)
  {
    if (4 != fread (&bufsize, 1, 4, f)){
      bitrate = 8 * totalsize / (1000*currentframe/framerate) ;
      printf("\n\nTotal size: %d bytes\tBit rate: %f kbit/s\n",totalsize,bitrate);
      fclose(f2);
      return 0;
    }
    if (4 != fread (&intime, 1, 4, f))
    {
      printf ("Panic, cannot read timestamp, old software version file?\n");
      return -1;
    }
    /*bufsize = bigendian(bufsize);*/
    printf ("\n\npacket #%4d containing %5d bytes\n", pacno++, bufsize);
    if (bufsize != fread (buf, 1, bufsize, f))
    {
      printf ("Problems while reading buffer, exit\n");
      return -3;
    }

    for (i=0; i< 25; i++)
      printf ("%02x ", buf[i]);
    printf ("\n");
    printf ("Version (V): %d\n", buf[0] & 0x3);
    printf ("Padding (P): %d\n", (buf[0] & 0x4) >> 2);
    printf ("Extension (X): %d\n", (buf[0] & 0x8) >> 3);
    printf ("CSRC count (CC): %d\n", (buf[0] & 0xf0) >> 4);
    printf ("Marker bit (M): %d\n", buf[1] & 0x1);
    printf ("Payload Type (PT): %d\n", (buf[1] & 0xfe) >> 1);
    printf ("Sequence Number: %d\n", buf[2] | (buf[3] << 8));
    printf ("Timestamp: %u\n", buf[4] | (buf[5] <<8) | (buf[6] <<16) | (buf[7] <<24));
    printf ("SSRC: %u\n", buf[8] | (buf[9] <<8) | (buf[10] <<16) | (buf[11] <<24));
    printf ("First Byte: 0x%x\n", buf[12]);
  
    pt = &buf[12];
    prio = dec_nal_u(pt);   
    
    /*pktsize = bufsize + HEADERSIZE;*/
    pktsize = bufsize; /* we don't add udp and ip header here */

    totalsize = totalsize + pktsize;

    if (currentframe >= 0)
      pkttime = START + currentframe/framerate;
    else
      pkttime = 0.0;
    
    fprintf(f2,"%d\t%f\t%d\t%d\n",pacno-1,pkttime,pktsize,prio);
  }
}