rtpduphello.cpp

A basic example of how to use RTPDuplex

// rtpduphello. 
// A very simple program for testing and illustrating basic features of ccRTP.
// Copyright (C) 2001,2002  Federico Montesino <fedemp@altern.org>
//  
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//  
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//  
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


// This is an introductory example file that illustrates basic usage
// of ccRTP. You will also see a bit on how to use CommonC++ threads.

// It is a typical hello world program. It consists of tow duplex
// connections that talk each other through RTP packets. They do not
// say more than a typical salutation message. They both send and
// receive messages, and print the messages they receive.


#include <cstdio>
#include <cstdlib>
// In order to use ccRTP, the RTP stack of CommonC++, you only need to
// include ...
#include <ccrtp/ext.h>

#ifdef  CCXX_NAMESPACES
using namespace ost;
using namespace std;
#endif

class ccRTP_dupHello: public Thread
{
private:
        // There will be two duplex connections. They both will send
        // and receive packets.
        RTPDuplex *duplexA, *duplexB;
        
public:
        // Destructor.
        ~ccRTP_dupHello(){
                terminate();
                delete duplexA;
                delete duplexB;  
        }
        
        // Constructor.
        ccRTP_dupHello() : duplexA(NULL), duplexB(NULL)
        { }

        // This method does almost everything.
        void run(void){    
                // redefined from Thread.
                
                // Before using ccRTP you should learn something about other
                // CommonC++ classes. We need InetHostAddress...

                // Construct loopback address
                InetHostAddress local_ip;
                local_ip = "127.0.0.1";
                
                // Is that correct?
                if( ! local_ip ){  
                // this is equivalent to `! local_ip.isInetAddress()'
                        cerr << ": IP address is not correct!" << endl;
                        exit();
                }
                
                cout << local_ip.getHostname() << 
                        " is going to talk to perself through " <<
                        local_ip << "..." << endl;
                                
                // ____Here comes the real RTP stuff____
                
                // Construct two RTPSocket. 22222 will be the base
                // port of A.  33334 will be the base port of B.
                const int A_BASE = 22222;
                const int B_BASE = 33334;

                duplexA = new RTPDuplex(local_ip,A_BASE,B_BASE);
                
                duplexB = new RTPDuplex(local_ip,B_BASE,A_BASE);

                // Set up A's connection
                duplexA->setSchedulingTimeout(90000);
                duplexA->setExpireTimeout(2500000);
                if( duplexA->connect(local_ip,B_BASE) < 0 )
                        cerr << "Duplex A could not connect.";
                
                // Set up B's connection
                duplexB->setSchedulingTimeout(160000);  
                duplexB->setExpireTimeout(3500000);
                if( duplexB->connect(local_ip,A_BASE) < 0 )
                        cerr << "Duplex B could not connect.";
                
                // Let's check the queues  (you should read the documentation
                // so that you know what the queues are for).
                
                if( duplexA->RTPDataQueue::isActive() )
                        cout << "The queue A is active." << endl;
                else
                        cerr << "The queue  A is not active." << endl;
                
                if( duplexB->RTPDataQueue::isActive() )
                        cout << "The queue B is active." << endl;
                else
                        cerr << "The queue B is not active." << endl;
                

                cout << "Transmitting..." << endl;
                
                // This message will be sent on RTP packets, from A to
                // B and from B to A.
                unsigned char helloA[] = "Hello, brave gnu world from A!";
                unsigned char helloB[] = "Hello, brave gnu world from B!";

                // This is not important
                time_t sending_time;
                time_t receiving_time;
                char tmstring[30];

                StaticPayloadFormat pf = sptMP2T;
                duplexA->setPayloadFormat(pf);
                duplexB->setPayloadFormat(pf);

                // This is the main loop, where packets are sent and receipt.
                // A and B both will send and receive packets.
                for( int i = 0 ; true ; i++ ){

                        // A and B do almost exactly the same things,
                        // I have kept this here -out of a send/receive
                        // method- in the interest of clarity.

                        // A: Send an RTP packet                        
                        sending_time = time(NULL);
                        duplexA->putData(2*(i)*90000,helloA,
                                          strlen((char *)helloA));
                        // Tell it
                        strftime(tmstring,30,"%X",localtime(&sending_time));
                        cout << "A: sending message at " << tmstring << "..." 
                             << endl;

                        // A: Receive an RTP packet
                        receiving_time = time(NULL);
                        const AppDataUnit* aduA = 
                                duplexA->getData(duplexA->getFirstTimestamp());
                        if ( aduA ) {
                                // Tell it
                                strftime(tmstring,30,"%X",localtime(&receiving_time));
                                cout << "A:[receiving at " << tmstring << "]: " << 
                                        aduA->getData() << endl;
                        }
                        // Wait for 0.1 seconds
                        Thread::sleep(100);

                        // B: Send an RTP packet                        
                        sending_time = time(NULL);
                        duplexB->putData(2*(i)*90000,helloB,
                                         strlen((char *)helloB));
                        // Tell it
                        strftime(tmstring,30,"%X",localtime(&sending_time));
                        cout << "B: sending message at " << tmstring << "..." 
                             << endl;

                        // B: Receive an RTP packet
                        receiving_time = time(NULL);
                        const AppDataUnit* aduB = 
                                duplexB->getData(duplexB->getFirstTimestamp());
                        if ( aduB ) {
                                // Tell it
                                strftime(tmstring,30,"%X",localtime(&receiving_time));
                                cout << "B:[receiving at " << tmstring << "]: " << 
                                        aduB->getData() << endl;
                        }

                        Thread::sleep(1900);
                }

        }
};

int main(int argc, char *argv[])
{
        // Construct the main thread. It will not run yet.
        ccRTP_dupHello *hello = new ccRTP_dupHello;
        
        cout << "This is rtpduphello, a very simple test program for ccRTP." 
             << endl << "Strike [Enter] when you are fed up." << endl;
        
        // Start execution of hello.
        hello->start();
        
        cin.get();

        cout << endl << "That's all" << endl;

        delete hello;

        exit(0);
}

---