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<hr><h1>rtphello.cpp</h1>
<p>
<div class="fragment"><pre><font class="comment">// rtphello</font>
<font class="comment">// A very simple program for testing and illustrating basic features of ccRTP.</font>
<font class="comment">// Copyright (C) 2001 Federico Montesino <p5087@quintero.fie.us.es></font>
<font class="comment">// </font>
<font class="comment">// This program is free software; you can redistribute it and/or modify</font>
<font class="comment">// it under the terms of the GNU General Public License as published by</font>
<font class="comment">// the Free Software Foundation; either version 2 of the License, or</font>
<font class="comment">// (at your option) any later version.</font>
<font class="comment">// </font>
<font class="comment">// This program is distributed in the hope that it will be useful,</font>
<font class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</font>
<font class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</font>
<font class="comment">// GNU General Public License for more details.</font>
<font class="comment">// </font>
<font class="comment">// You should have received a copy of the GNU General Public License</font>
<font class="comment">// along with this program; if not, write to the Free Software</font>
<font class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</font>
<font class="comment">// This is an introductory example file that illustrates basic usage</font>
<font class="comment">// of ccRTP. You will also see a bit on how to use other classes from</font>
<font class="comment">// CommonC++.</font>
<font class="comment">// I am a typical hello world program. I consist of a sender thread,</font>
<font class="comment">// that sends the salutation message on RTP packets; and a receiver</font>
<font class="comment">// thread, that prints the messages. This is a program with an unsual</font>
<font class="comment">// structure, since the sender has no clear periodicity, the receiver</font>
<font class="comment">// is very unreliable, and both are in the same program. Thus, it</font>
<font class="comment">// should not be seen as an example for typical applications but as a</font>
<font class="comment">// test of some functions of ccRTP.</font>
<font class="comment">// In order to use ccRTP, the RTP stack of CommonC++, just include...</font>
<font class="preprocessor">#include <cc++/<a class="code" href="rtp_h.html">rtp.h</a>></font>
<font class="comment">// base ports</font>
<font class="keyword">const</font> <font class="keywordtype">int</font> RECEIVER_BASE = 33634;
<font class="keyword">const</font> <font class="keywordtype">int</font> TRANSMITTER_BASE = 32522;
<font class="comment">// For this example, this is irrelevant. </font>
<font class="keyword">const</font> <font class="keywordtype">int</font> TIMESTAMP_RATE = 90000;
<font class="keyword">class </font>ccRTP_Hello_Rx: <font class="keyword">public</font> <a name="_a0"></a><a class="code" href="class_Thread.html">Thread</a>
{
<font class="keyword">private</font>:
<font class="comment">// socket to receive packets</font>
<a name="_a1"></a><a class="code" href="class_T_RTPSocket.html">RTPSocket</a> *socket;
<font class="comment">// loopback network address</font>
InetHostAddress local_ip;
<font class="comment">// identifier of this sender</font>
uint32 ssrc;
<font class="keyword">public</font>:
ccRTP_Hello_Rx()<font class="keyword"></font>{
<font class="comment">// Before using ccRTP you should learn something about other</font>
<font class="comment">// CommonC++ classes. We need InetHostAddress...</font>
<font class="comment">// Construct loopback address</font>
local_ip = <font class="stringliteral">"127.0.0.1"</font>;
<font class="comment">// Is that correct?</font>
<font class="keywordflow">if</font>( ! local_ip ){
<font class="comment">// this is equivalent to `! local_ip.isInetAddress()'</font>
cerr << <font class="stringliteral">"Rx: IP address is not correct!"</font> << endl;
exit(1);
}
<font class="comment">// create socket for RTP connection and get a random</font>
<font class="comment">// SSRC identifier</font>
socket = <font class="keyword">new</font> <a name="a2"></a><a class="code" href="rtp_h.html#a3">RTPSocket</a>(local_ip,RECEIVER_BASE,0);
ssrc = socket->getLocalInfo().getID();
}
~ccRTP_Hello_Rx()<font class="keyword"></font>{
cout << endl << <font class="stringliteral">"Destroying receiver with ID "</font> << ssrc;
Terminate();
<font class="keyword">delete</font> socket;
cout << <font class="stringliteral">"... "</font> << <font class="stringliteral">"destroyed."</font>;
}
<font class="comment">// This method does almost everything.</font>
<font class="keywordtype">void</font> Run(<font class="keywordtype">void</font>)<font class="keyword"></font>{
cout << <font class="stringliteral">"Hello, "</font> << socket->getLocalInfo().getCNAME()
<< <font class="stringliteral">" ..."</font> << endl;
<font class="comment">// redefined from Thread.</font>
<font class="comment">// Set up connection</font>
socket->setTimeout(20000);
socket->setExpired(3000000);
<font class="comment">//socket->UDPTransmit::setTypeOfService(SOCKET_IPTOS_LOWDELAY);</font>
<font class="keywordflow">if</font>( socket-><a name="a3"></a><a class="code" href="class_T_RTPSocket.html#a3">Connect</a>(local_ip,TRANSMITTER_BASE) < 0 )
cerr << <font class="stringliteral">"Rx ("</font> << ssrc
<< <font class="stringliteral">"): could not connect to port."</font>
<< TRANSMITTER_BASE;
<font class="comment">// Let's check the queues (you should read the documentation</font>
<font class="comment">// so that you know what the queues are for).</font>
cout << <font class="stringliteral">"Rx ("</font> << ssrc
<< <font class="stringliteral">"): The queue is "</font>
<< ( socket-><a name="a4"></a><a class="code" href="class_RTPQueue.html#a20">RTPQueue::isActive</a>() ? <font class="stringliteral">""</font> : <font class="stringliteral">"in"</font>)
<< <font class="stringliteral">"active."</font> << endl;
cout << <font class="stringliteral">"Rx ("</font> << ssrc
<< <font class="stringliteral">"): "</font> << local_ip.getHostname()
<< <font class="stringliteral">" is waiting for salutes in port "</font>
<< RECEIVER_BASE << <font class="stringliteral">"..."</font> << endl;
<font class="comment">// This is the main loop, where packets are received.</font>
<font class="keywordflow">for</font>( <font class="keywordtype">int</font> i = 0 ; <font class="keyword">true</font> ; i++ ){
<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> buffer[100] = <font class="stringliteral">"[empty]"</font>;
<font class="comment">// Wait for an RTP packet. [Absolutely unreliable]</font>
<font class="keywordflow">while</font> ( !socket->getPacket(socket->getFirstTimestamp(),
buffer,100) )
ccxx_sleep(10);
<font class="comment">// Print content (likely a salute)</font>
time_t receiving_time = time(NULL);
<font class="keywordtype">char</font> tmstring[30];
strftime(tmstring,30,<font class="stringliteral">"%X"</font>,localtime(&receiving_time));
cout << <font class="stringliteral">"Rx ("</font> << ssrc
<< <font class="stringliteral">"): [receiving at "</font> << tmstring << <font class="stringliteral">"]: "</font>
<< buffer << endl;
}
}
};
<font class="keyword">class </font>ccRTP_Hello_Tx: <font class="keyword">public</font> <a class="code" href="class_Thread.html">Thread</a>, <font class="keyword">public</font> TimerPort
{
<font class="keyword">private</font>:
<font class="comment">// socket to transmit</font>
<a class="code" href="class_T_RTPSocket.html">RTPSocket</a> *socket;
<font class="comment">// loopback network address</font>
InetHostAddress local_ip;
<font class="comment">// identifier of this sender</font>
uint32 ssrc;
<font class="keyword">public</font>:
ccRTP_Hello_Tx()<font class="keyword"></font>{
<font class="comment">// Before using ccRTP you should learn something about other</font>
<font class="comment">// CommonC++ classes. We need InetHostAddress...</font>
<font class="comment">// Construct loopback address</font>
local_ip = <font class="stringliteral">"127.0.0.1"</font>;
<font class="comment">// Is that correct?</font>
<font class="keywordflow">if</font>( ! local_ip ){
<font class="comment">// this is equivalent to `! local_ip.isInetAddress()'</font>
cerr << <font class="stringliteral">"Tx: IP address is not correct!"</font> << endl;
exit(1);
}
socket = <font class="keyword">new</font> <a class="code" href="rtp_h.html#a3">RTPSocket</a>(local_ip,TRANSMITTER_BASE,0);
ssrc = socket->getLocalInfo().getID();
}
~ccRTP_Hello_Tx()<font class="keyword"></font>{
cout << endl << <font class="stringliteral">"Destroying transmitter with ID "</font> << ssrc;
Terminate();
<font class="keyword">delete</font> socket;
cout << <font class="stringliteral">"... "</font> << <font class="stringliteral">"destroyed."</font>;
}
<font class="comment">// This method does almost everything.</font>
<font class="keywordtype">void</font> Run(<font class="keywordtype">void</font>)<font class="keyword"></font>{
<font class="comment">// redefined from Thread.</font>
cout << <font class="stringliteral">"Tx ("</font> << ssrc << <font class="stringliteral">"): "</font> << local_ip.getHostname()
<< <font class="stringliteral">" is going to salute perself through "</font>
<< local_ip << <font class="stringliteral">"..."</font> << endl;
<font class="comment">// Set up connection</font>
socket->setTimeout(20000);
socket->setExpired(3000000);
<font class="keywordflow">if</font>( socket-><a class="code" href="class_T_RTPSocket.html#a3">Connect</a>(local_ip,RECEIVER_BASE) < 0 )
cerr << <font class="stringliteral">"Tx ("</font> << ssrc
<< <font class="stringliteral">"): could not connect to port."</font>
<< RECEIVER_BASE;
<font class="comment">// Let's check the queues (you should read the documentation</font>
<font class="comment">// so that you know what the queues are for).</font>
cout << <font class="stringliteral">"Tx ("</font> << ssrc << <font class="stringliteral">"): The queue is "</font>
<< ( socket-><a class="code" href="class_RTPQueue.html#a20">RTPQueue::isActive</a>()? <font class="stringliteral">""</font> : <font class="stringliteral">"in"</font>)
<< <font class="stringliteral">"active."</font> << endl;
cout << <font class="stringliteral">"Tx ("</font> << ssrc << <font class="stringliteral">"): Transmitting salutes to port "</font>
<< RECEIVER_BASE << <font class="stringliteral">"..."</font> << endl;
uint32 timestamp = 0;
<font class="comment">//socket->getCurrentTimestamp(RTP_PAYLOAD_MP2T);</font>
time_t initial_time = time(NULL);
<font class="comment">// This will be useful for periodic execution</font>
TimerPort::setTimer(1000);
<font class="comment">// This is the main loop, where packets are sent.</font>
<font class="keywordflow">for</font>( <font class="keywordtype">int</font> i = 0 ; <font class="keyword">true</font> ;){
<font class="keyword">const</font> uint32 TIMESTAMP_RATE =
socket->getRate(RTP_PAYLOAD_MP2T);
<font class="comment">// send RTP packets, providing timestamp,</font>
<font class="comment">// payload type and payload. </font>
<font class="comment">// construct salute.</font>
<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> salute[50];
snprintf((<font class="keywordtype">char</font> *)salute,50,
<font class="stringliteral">"Hello, brave gnu world! (no %u)"</font>,i);
time_t sending_time = time(NULL);
<font class="comment">// get timestamp to send salute</font>
<font class="keywordflow">if</font> ( i++ == 0 ){
timestamp = socket->
getCurrentTimestamp(RTP_PAYLOAD_MP2T);
} <font class="keywordflow">else</font> {
<font class="comment">// increment for 1 second</font>
timestamp += socket->getRate(RTP_PAYLOAD_MP2T);
}
socket->putPacket(timestamp,
RTP_PAYLOAD_MP2T,
salute,
strlen((<font class="keywordtype">char</font> *)salute)+1);
<font class="comment">// print info</font>
<font class="keywordtype">char</font> tmstring[30];
strftime(tmstring,30,<font class="stringliteral">"%X"</font>,
localtime(&sending_time));
cout << <font class="stringliteral">"Tx ("</font> << ssrc
<< <font class="stringliteral">"): sending salute "</font> << <font class="stringliteral">"no "</font> << i++
<< <font class="stringliteral">", at "</font> << tmstring
<< <font class="stringliteral">"..."</font> << endl;
<font class="comment">// Let's wait for the next cycle</font>
ccxx_sleep(TimerPort::getTimer());
TimerPort::incTimer(1000);
}
}
};
<font class="keywordtype">void</font> main(<font class="keywordtype">int</font> argc, <font class="keywordtype">char</font> *argv[])<font class="keyword"></font>{
<font class="comment">// Construct the two main threads. they will not run yet.</font>
ccRTP_Hello_Rx *receiver = <font class="keyword">new</font> ccRTP_Hello_Rx;
ccRTP_Hello_Tx *transmitter = <font class="keyword">new</font> ccRTP_Hello_Tx;
cout << <font class="stringliteral">"This is rtphello, a very simple test program for ccRTP."</font> <<
endl << <font class="stringliteral">"Strike [Enter] when you are fed up with it."</font> << endl;
<font class="comment">// Start execution of hello now.</font>
receiver->Start();
transmitter->Start();
cin.get();
<font class="keyword">delete</font> receiver;
<font class="keyword">delete</font> transmitter;
cout << endl << <font class="stringliteral">"That's all"</font> << endl;
exit(0);
}
</div></pre><hr><address><small>Generated at Fri Oct 5 10:28:25 2001 for ccRTP by
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