rtpduphello.cpp

A basic example of how to use RTPDuplex.

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);
}
AppDataUnit
Interface (envelope) to data received over RTP packets.
Definition queuebase.h:70
AppDataUnit::getData
const uint8 *const getData() const
Get data as it is received in RTP packets (i.e.
Definition queuebase.h:106
IncomingDataQueue::getFirstTimestamp
uint32 getFirstTimestamp(const SyncSource *src=NULL) const
Get timestamp of first packet waiting in the queue.
IncomingDataQueue::getData
const AppDataUnit * getData(uint32 stamp, const SyncSource *src=NULL)
Retreive data from a specific timestamped packet if such a packet is currently available in the recei...
OutgoingDataQueue::setSchedulingTimeout
void setSchedulingTimeout(microtimeout_t to)
Set the default scheduling timeout to use when no data packets are waiting to be sent.
Definition oqueue.h:365
OutgoingDataQueue::putData
void putData(uint32 stamp, const unsigned char *data=NULL, size_t len=0)
This is used to create a data packet in the send queue.
OutgoingDataQueue::setExpireTimeout
void setExpireTimeout(microtimeout_t to)
Set the "expired" timer for expiring packets pending in the send queue which have gone unsent and are...
Definition oqueue.h:380
RTPDuplex
A peer associated RTP socket pair for physically connected peer hosts.
Definition ext.h:73
RTPQueueBase::setPayloadFormat
bool setPayloadFormat(const PayloadFormat &pf)
Set the payload format in use, for timing and payload type identification purposes.
Definition queuebase.h:178
StaticPayloadFormat
Static payload format objects.
Definition formats.h:202
ext.h
ccRTP Stack extensions.
sptMP2T
@ sptMP2T
MPEG 2 Transport stream (RFCs 1890, 2250).
Definition formats.h:109
RTPDuplex::connect
UDPTransmit::Error connect(const InetHostAddress &host, tpport_t port=0)