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