用UDP实现HTTP Streaming协议从指定的URL拉流

实现一个整型函数 int request (char* hostname, char* api, char* parameters, string& message) 主要分为建立udp，发送信令，接收服务器返回信令，接收数据三个部分功能 首先建立UDP: #ifdef WIN_OS  {   WSADATA WsaData;   WSAStartup (0x0101, &WsaData);  } #endif     sockaddr_in       sin;     int sock = socket (AF_INET, SOCK_STREAM, 0);     if (sock == -1)     {     return -100;     }     sin.sin_family = AF_INET;     sin.sin_port = htons( (unsigned short)8080);     struct hostent * host_addr = gethostbyname(hostname);     if(host_addr==NULL)     {     cout<<"Unable to locate host"<<endl ;     return -103;     }     sin.sin_addr.s_addr = *((int*)*host_addr->h_addr_list) ;     cout<<"Port :"<<sin.sin_port<<", Address : "<< sin.sin_addr.s_addr<<endl;     if( connect (sock,(const struct sockaddr *)&sin, sizeof(sockaddr_in) ) == -1 )     {     cout<<"connect failed"<<endl  ;     return -101;     } 其次定义一个宏： #define SEND_RQ(MSG)   send(sock,MSG,strlen(MSG),0); 向服务器发送信令:  SEND_RQ("GET ");  char* api;//这里填URL文件名，比如 http://127.0.0.1:8888/1.asf中的1.asf  SEND_RQ(api);  SEND_RQ("HTTP/1.0\r\n");  SEND_RQ("Accept: */*\r\n");  SEND_RQ("User-Agent: NSPlayer/4.1.0.3925\r\n");  char content_header[100];  sprintf(content_header,"Content-Length: %d\r\n",strlen(parameters));  SEND_RQ(content_header);  SEND_RQ("Host: ");  SEND_RQ("hostname");  SEND_RQ("\r\n");  //If you need to send a basic authorization  //string Auth        = "username:password";  //Figureout a way to encode test into base64 !  //string AuthInfo    = base64_encode(reinterpret_cast<const unsigned char*>(Auth.c_str()),Auth.length());  //string sPassReq    = "Authorization: Basic " + AuthInfo;  //SEND_RQ(sPassReq.c_str());  SEND_RQ("\r\n");  SEND_RQ("\r\n");  SEND_RQ(parameters);  SEND_RQ("\r\n"); 接受服务器发送反馈信令： //接收头部  cout<<"####HEADER####"<<endl;  char c1[1];  int l,line_length;  bool loop = true;  bool bHeader = false;  while(loop)  {    l = recv(sock, c1, 1023, 0);    if(l<0)     loop = false;    if(c1[0]=='\n')    {        if(line_length == 0) loop = false;        line_length = 0;        if(message.find("200") != string::npos)         bHeader = true;    }    else if(c1[0]!='\r') line_length++;     cout<<c1[0];    message += c1[0];     } //接收body   message="";   if(bHeader)    {    cout<<"####BODY####"<<endl ;    char p[1024];    while((l = recv(sock,p,1023,0)) > 0)      {        cout.write(p,l) ;        p[l] = '\0';        message += p;      }        cout << message.c_str();   }    else    {    return -102;   } //清理工作 #ifdef  WIN_OS WSACleanup( ); #endif //------------------------------------------------------------------------------------------------------------------------------------------------- 相关的协议信令： RTSP协议 //RTSP DESCRIBE rtsp://wm.microsoft.com/ms/video/0001-hi.wmv RTSP/1.0 User-Agent: WMPlayer/9.0.0.2980 guid/3300AD50-2C39-46C0-AE0A-81D88F547805 Accept: application/sdp Accept-Charset: UTF-8, *;q=0.1 X-Accept-Authentication: NTLM, Digest, Basic Accept-Language: en-GB, *;q=0.1 CSeq: 1 Supported: com.microsoft.wm.srvppair, com.microsoft.wm.sswitch, com.microsoft.wm.eosmsg, com.microsoft.wm.predstrm HTTP STREAM协议 //HTTP STREAM GET /ms/contoso_100_files/0MM0.wmv HTTP/1.0 Accept: */* User-Agent: NSPlayer/4.1.0.3925 Host: netshow.micro.com Pragma: no-cache,rate=1.000000,stream-time=0,stream-offset=0:0,request-context=1,max-duration=0 Pragma: xClientGUID={2200AD50-2C39-46c0-AE0A-2CA76D8C766D} //HTTP STREAM SECOND GET /ms/contoso_100_files/0MM0.wmv HTTP/1.0 Accept: */* User-Agent: NSPlayer/4.1.0.3925 Host: netshow.micro.com Pragma: no-cache,rate=1.000000,stream-time=0,stream-offset=4294967295:4294967295,request-context=2,max-duration=2147609515 Pragma: xPlayStrm=1 Pragma: xClientGUID={2200AD50-2C39-46c0-AE0A-2CA76D8C766D} Pragma: stream-switch-count=2 Pragma: stream-switch-entry=ffff:1:0 ffff:2:0