// 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); }