rtp.c

自己移植的linux下的流媒体播放器原代码,支持mms协议,支持ftp和http协议.

/* Imported from the dvbstream-0.2 project
 *
 * Modified for use with MPlayer, for details see the CVS changelog at
 * http://www.mplayerhq.hu/cgi-bin/cvsweb.cgi/main/
 * $Id: rtp.c,v 1.8 2005/04/16 12:51:09 diego Exp $
 */

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include "config.h"
#ifndef HAVE_WINSOCK2
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif

/* MPEG-2 TS RTP stack */

#define DEBUG        1
#include "rtp.h"


int getrtp2(int fd, struct rtpheader *rh, char** data, int* lengthData) {
  static char buf[1600];
  unsigned int intP;
  char* charP = (char*) &intP;
  int headerSize;
  int lengthPacket;
  lengthPacket=recv(fd,buf,1590,0);
  if (lengthPacket==0)
    exit(1);
  if (lengthPacket<0) {
    fprintf(stderr,"socket read error\n");
    exit(2);
  }
  if (lengthPacket<12) {
    fprintf(stderr,"packet too small (%d) to be an rtp frame (>12bytes)\n", lengthPacket);
    exit(3);
  }
  rh->b.v  = (unsigned int) ((buf[0]>>6)&0x03);
  rh->b.p  = (unsigned int) ((buf[0]>>5)&0x01);
  rh->b.x  = (unsigned int) ((buf[0]>>4)&0x01);
  rh->b.cc = (unsigned int) ((buf[0]>>0)&0x0f);
  rh->b.m  = (unsigned int) ((buf[1]>>7)&0x01);
  rh->b.pt = (unsigned int) ((buf[1]>>0)&0x7f);
  intP = 0;
  memcpy(charP+2,&buf[2],2);
  rh->b.sequence = ntohl(intP);
  intP = 0;
  memcpy(charP,&buf[4],4);
  rh->timestamp = ntohl(intP);

  headerSize = 12 + 4*rh->b.cc; /* in bytes */

  *lengthData = lengthPacket - headerSize;
  *data = (char*) buf + headerSize;

  //  fprintf(stderr,"Reading rtp: v=%x p=%x x=%x cc=%x m=%x pt=%x seq=%x ts=%x lgth=%d\n",rh->b.v,rh->b.p,rh->b.x,rh->b.cc,rh->b.m,rh->b.pt,rh->b.sequence,rh->timestamp,lengthPacket);

  return(0);
}