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<div class="title">rtphello.cpp</div> </div>
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<p>A basic example of how to use <a class="el" href="class_r_t_p_packet.html" title="A base class for both IncomingRTPPkt and OutgoingRTPPkt. ">RTPPacket</a></p>
<div class="fragment"><div class="line"><span class="comment">// rtphello</span></div>
<div class="line"><span class="comment">// A very simple program for testing and illustrating basic features of ccRTP.</span></div>
<div class="line"><span class="comment">// Copyright (C) 2001,2002 Federico Montesino <fedemp@altern.org></span></div>
<div class="line"><span class="comment">// </span></div>
<div class="line"><span class="comment">// This program is free software; you can redistribute it and/or modify</span></div>
<div class="line"><span class="comment">// it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><span class="comment">// the Free Software Foundation; either version 2 of the License, or</span></div>
<div class="line"><span class="comment">// (at your option) any later version.</span></div>
<div class="line"><span class="comment">// </span></div>
<div class="line"><span class="comment">// This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><span class="comment">// GNU General Public License for more details.</span></div>
<div class="line"><span class="comment">// </span></div>
<div class="line"><span class="comment">// You should have received a copy of the GNU General Public License</span></div>
<div class="line"><span class="comment">// along with this program; if not, write to the Free Software</span></div>
<div class="line"><span class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">// This is an introductory example file that illustrates basic usage</span></div>
<div class="line"><span class="comment">// of ccRTP. You will also see a bit on how to use other classes from</span></div>
<div class="line"><span class="comment">// CommonC++.</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// I am a typical hello world program. I consist of a sender thread,</span></div>
<div class="line"><span class="comment">// that sends the salutation message on RTP packets; and a receiver</span></div>
<div class="line"><span class="comment">// thread, that prints the messages. This is a program with an unsual</span></div>
<div class="line"><span class="comment">// structure, the receiver just tries to process the first available</span></div>
<div class="line"><span class="comment">// packet periodically, and both are in the same program. Thus, it</span></div>
<div class="line"><span class="comment">// should not be seen as an example for typical applications but as a</span></div>
<div class="line"><span class="comment">// test of some functions of ccRTP.</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <cstdio></span></div>
<div class="line"><span class="preprocessor">#include <ctime></span></div>
<div class="line"><span class="comment">// In order to use ccRTP, the RTP stack of CommonC++, just include...</span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="rtp_8h.html">ccrtp/rtp.h</a>></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifdef CCXX_NAMESPACES</span></div>
<div class="line"><span class="keyword">using namespace </span>ost;</div>
<div class="line"><span class="keyword">using namespace </span>std;</div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// base ports</span></div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> RECEIVER_BASE = 33634;</div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">int</span> TRANSMITTER_BASE = 32522;</div>
<div class="line"></div>
<div class="line"><span class="comment">// For this example, this is irrelevant. </span></div>
<div class="line"><span class="comment">//const int TIMESTAMP_RATE = 90000;</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">class </span>ccRTP_Hello_Rx: <span class="keyword">public</span> Thread</div>
<div class="line">{</div>
<div class="line"></div>
<div class="line"><span class="keyword">private</span>:</div>
<div class="line"> <span class="comment">// socket to receive packets</span></div>
<div class="line"> <a name="_a0"></a><a class="code" href="class_single_thread_r_t_p_session.html">RTPSession</a> *socket;</div>
<div class="line"> <span class="comment">// loopback network address</span></div>
<div class="line"> InetHostAddress local_ip;</div>
<div class="line"> <span class="comment">// identifier of this sender</span></div>
<div class="line"> uint32 ssrc;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">public</span>:</div>
<div class="line"> ccRTP_Hello_Rx(){</div>
<div class="line"> <span class="comment">// Before using ccRTP you should learn something about other</span></div>
<div class="line"> <span class="comment">// CommonC++ classes. We need InetHostAddress...</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Construct loopback address</span></div>
<div class="line"> local_ip = <span class="stringliteral">"127.0.0.1"</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Is that correct?</span></div>
<div class="line"> <span class="keywordflow">if</span>( ! local_ip ){ </div>
<div class="line"> <span class="comment">// this is equivalent to `! local_ip.isInetAddress()'</span></div>
<div class="line"> cerr << <span class="stringliteral">"Rx: IP address is not correct!"</span> << endl;</div>
<div class="line"> exit();</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// create socket for RTP connection and get a random</span></div>
<div class="line"> <span class="comment">// SSRC identifier</span></div>
<div class="line"> socket = <span class="keyword">new</span> <a name="a1"></a><a class="code" href="group__sessions.html#ga24e16f350c9ae0c1e2a3f5d6a6dad9f9">RTPSession</a>(local_ip,RECEIVER_BASE);</div>
<div class="line"> ssrc = socket->getLocalSSRC();</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> ~ccRTP_Hello_Rx(){</div>
<div class="line"> cout << endl << <span class="stringliteral">"Destroying receiver -ID: "</span> << hex</div>
<div class="line"> << (int)ssrc;</div>
<div class="line"> terminate();</div>
<div class="line"> <span class="keyword">delete</span> socket;</div>
<div class="line"> cout << <span class="stringliteral">"... "</span> << <span class="stringliteral">"destroyed."</span>;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// This method does almost everything.</span></div>
<div class="line"> <span class="keywordtype">void</span> run(<span class="keywordtype">void</span>){ </div>
<div class="line"></div>
<div class="line"> cout << <span class="stringliteral">"Hello, "</span> << <a name="a2"></a><a class="code" href="group__sources.html#ga206420a8423d0c261e9bfc5a388a9534">defaultApplication</a>().</div>
<div class="line"> getSDESItem(<a name="a3"></a><a class="code" href="group__rtcppacket.html#ggaf6d38e5ccbbcdf2a24ebbd4fc5b4eeaca56818aeaa2d578ab0055a59b8d8d28f9">SDESItemTypeCNAME</a>)</div>
<div class="line"> << <span class="stringliteral">" ..."</span> << endl;</div>
<div class="line"> <span class="comment">// redefined from Thread.</span></div>
<div class="line"> <span class="comment">// Set up connection</span></div>
<div class="line"> socket->setSchedulingTimeout(20000);</div>
<div class="line"> socket->setExpireTimeout(3000000);</div>
<div class="line"> <span class="comment">//socket->UDPTransmit::setTypeOfService(SOCKET_IPTOS_LOWDELAY);</span></div>
<div class="line"> <span class="keywordflow">if</span>( !socket->addDestination(local_ip,TRANSMITTER_BASE) )</div>
<div class="line"> cerr << <span class="stringliteral">"Rx ("</span> << hex << (<span class="keywordtype">int</span>)ssrc </div>
<div class="line"> << <span class="stringliteral">"): could not connect to port."</span> </div>
<div class="line"> << TRANSMITTER_BASE;</div>
<div class="line"> </div>
<div class="line"> cout << <span class="stringliteral">"Rx ("</span> << hex << (int)ssrc</div>
<div class="line"> << <span class="stringliteral">"): "</span> << local_ip.getHostname() </div>
<div class="line"> << <span class="stringliteral">" is waiting for salutes in port "</span></div>
<div class="line"> << RECEIVER_BASE << <span class="stringliteral">"..."</span> << endl;</div>
<div class="line"> </div>
<div class="line"> socket->setPayloadFormat(<a name="_a4"></a><a class="code" href="class_static_payload_format.html">StaticPayloadFormat</a>(<a name="a5"></a><a class="code" href="group__payload.html#gga7644623ce29b8ca519d7e3f276b6ddc6a3f5b07dca910f599be16c871ebbb29d1">sptMP2T</a>));</div>
<div class="line"> socket-><a name="a6"></a><a class="code" href="class_single_thread_r_t_p_session.html#ae861fb5d15be69ea35da87ee41ad6b0b">startRunning</a>();</div>
<div class="line"> <span class="comment">// Let's check the queues (you should read the documentation</span></div>
<div class="line"> <span class="comment">// so that you know what the queues are for).</span></div>
<div class="line"> cout << <span class="stringliteral">"Rx ("</span> << hex << (int)ssrc </div>
<div class="line"> << <span class="stringliteral">"): The queue is "</span> </div>
<div class="line"> << ( socket->isActive() ? <span class="stringliteral">""</span> : <span class="stringliteral">"in"</span>) </div>
<div class="line"> << <span class="stringliteral">"active."</span> << endl; </div>
<div class="line"></div>
<div class="line"> <span class="comment">// This is the main loop, where packets are received.</span></div>
<div class="line"> <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0 ; true ; i++ ){</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Wait for an RTP packet.</span></div>
<div class="line"> <span class="keyword">const</span> <a name="_a7"></a><a class="code" href="class_app_data_unit.html">AppDataUnit</a> *adu = NULL;</div>
<div class="line"> <span class="keywordflow">while</span> ( NULL == adu ) {</div>
<div class="line"> Thread::sleep(10);</div>
<div class="line"> adu = socket->getData(socket->getFirstTimestamp());</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Print content (likely a salute :))</span></div>
<div class="line"> <span class="comment">// Note we are sure the data is an asciiz string.</span></div>
<div class="line"> time_t receiving_time = time(NULL);</div>
<div class="line"> <span class="keywordtype">char</span> tmstring[30];</div>
<div class="line"> strftime(tmstring,30,<span class="stringliteral">"%X"</span>,localtime(&receiving_time));</div>
<div class="line"> cout << <span class="stringliteral">"Rx ("</span> << hex << (int)ssrc </div>
<div class="line"> << <span class="stringliteral">"): [receiving at "</span> << tmstring << <span class="stringliteral">"]: "</span> </div>
<div class="line"> << adu-><a name="a8"></a><a class="code" href="class_app_data_unit.html#abe15787e1cc84dd03b0769a5546d7a38">getData</a>() << endl;</div>
<div class="line"> <span class="keyword">delete</span> adu;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"><span class="keyword">class </span>ccRTP_Hello_Tx: <span class="keyword">public</span> Thread, <span class="keyword">public</span> TimerPort</div>
<div class="line">{</div>
<div class="line"></div>
<div class="line"><span class="keyword">private</span>:</div>
<div class="line"> <span class="comment">// socket to transmit</span></div>
<div class="line"> <a class="code" href="class_single_thread_r_t_p_session.html">RTPSession</a> *socket;</div>
<div class="line"> <span class="comment">// loopback network address</span></div>
<div class="line"> InetHostAddress local_ip;</div>
<div class="line"> <span class="comment">// identifier of this sender</span></div>
<div class="line"> uint32 ssrc;</div>
<div class="line"></div>
<div class="line"><span class="keyword">public</span>:</div>
<div class="line"> ccRTP_Hello_Tx(){</div>
<div class="line"> <span class="comment">// Before using ccRTP you should learn something about other</span></div>
<div class="line"> <span class="comment">// CommonC++ classes. We need InetHostAddress...</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Construct loopback address</span></div>
<div class="line"> local_ip = <span class="stringliteral">"127.0.0.1"</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Is that correct?</span></div>
<div class="line"> <span class="keywordflow">if</span>( ! local_ip ){ </div>
<div class="line"> <span class="comment">// this is equivalent to `! local_ip.isInetAddress()'</span></div>
<div class="line"> cerr << <span class="stringliteral">"Tx: IP address is not correct!"</span> << endl;</div>
<div class="line"> exit();</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> socket = <span class="keyword">new</span> <a class="code" href="group__sessions.html#ga24e16f350c9ae0c1e2a3f5d6a6dad9f9">RTPSession</a>(local_ip,TRANSMITTER_BASE);</div>
<div class="line"> ssrc = socket->getLocalSSRC();</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> ~ccRTP_Hello_Tx(){</div>
<div class="line"> cout << endl << <span class="stringliteral">"Destroying transmitter -ID: "</span> << hex </div>
<div class="line"> << (int)ssrc;</div>
<div class="line"> terminate();</div>
<div class="line"> <span class="keyword">delete</span> socket;</div>
<div class="line"> cout << <span class="stringliteral">"... "</span> << <span class="stringliteral">"destroyed."</span>;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// This method does almost everything.</span></div>
<div class="line"> <span class="keywordtype">void</span> run(<span class="keywordtype">void</span>){ </div>
<div class="line"> <span class="comment">// redefined from Thread.</span></div>
<div class="line"> cout << <span class="stringliteral">"Tx ("</span> << hex << (int)ssrc << <span class="stringliteral">"): "</span> << </div>
<div class="line"> local_ip.getHostname() </div>
<div class="line"> << <span class="stringliteral">" is going to salute perself through "</span> </div>
<div class="line"> << local_ip << <span class="stringliteral">"..."</span> << endl;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Set up connection</span></div>
<div class="line"> socket->setSchedulingTimeout(20000);</div>
<div class="line"> socket->setExpireTimeout(3000000);</div>
<div class="line"> <span class="keywordflow">if</span>( !socket->addDestination(local_ip,RECEIVER_BASE) )</div>
<div class="line"> cerr << <span class="stringliteral">"Tx ("</span> << hex << (<span class="keywordtype">int</span>)ssrc </div>
<div class="line"> << <span class="stringliteral">"): could not connect to port."</span> </div>
<div class="line"> << RECEIVER_BASE;</div>
<div class="line"> </div>
<div class="line"> cout << <span class="stringliteral">"Tx ("</span> << hex << (int)ssrc << </div>
<div class="line"> <span class="stringliteral">"): Transmitting salutes to port "</span></div>
<div class="line"> << RECEIVER_BASE << <span class="stringliteral">"..."</span> << endl;</div>
<div class="line"></div>
<div class="line"> uint32 timestamp = 0;</div>
<div class="line"> <span class="comment">// This will be useful for periodic execution</span></div>
<div class="line"> TimerPort::setTimer(1000);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// This is the main loop, where packets are sent.</span></div>
<div class="line"> socket->setPayloadFormat(<a class="code" href="class_static_payload_format.html">StaticPayloadFormat</a>(<a class="code" href="group__payload.html#gga7644623ce29b8ca519d7e3f276b6ddc6a3f5b07dca910f599be16c871ebbb29d1">sptMP2T</a>));</div>
<div class="line"> socket-><a class="code" href="class_single_thread_r_t_p_session.html#ae861fb5d15be69ea35da87ee41ad6b0b">startRunning</a>();</div>
<div class="line"> <span class="comment">// Let's check the queues (you should read the documentation</span></div>
<div class="line"> <span class="comment">// so that you know what the queues are for).</span></div>
<div class="line"> cout << <span class="stringliteral">"Tx ("</span> << hex << (int)ssrc << <span class="stringliteral">"): The queue is "</span></div>
<div class="line"> << ( socket->isActive()? <span class="stringliteral">""</span> : <span class="stringliteral">"in"</span>)</div>
<div class="line"> << <span class="stringliteral">"active."</span> << endl;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0 ; true ;i++ ){</div>
<div class="line"></div>
<div class="line"> <span class="comment">// send RTP packets, providing timestamp,</span></div>
<div class="line"> <span class="comment">// payload type and payload. </span></div>
<div class="line"> <span class="comment">// construct salute.</span></div>
<div class="line"> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> salute[50];</div>
<div class="line"> snprintf((<span class="keywordtype">char</span> *)salute,50,</div>
<div class="line"> <span class="stringliteral">"Hello, brave gnu world (#%u)!"</span>,i);</div>
<div class="line"> time_t sending_time = time(NULL);</div>
<div class="line"> <span class="comment">// get timestamp to send salute</span></div>
<div class="line"> <span class="keywordflow">if</span> ( 0 == i ){</div>
<div class="line"> timestamp = socket->getCurrentTimestamp();</div>
<div class="line"> </div>
<div class="line"> } <span class="keywordflow">else</span> {</div>
<div class="line"> <span class="comment">// increment for 1 second</span></div>
<div class="line"> timestamp += socket->getCurrentRTPClockRate();</div>
<div class="line"> } </div>
<div class="line"></div>
<div class="line"> socket->putData(timestamp,salute,</div>
<div class="line"> strlen((<span class="keywordtype">char</span> *)salute)+1);</div>
<div class="line"> <span class="comment">// print info</span></div>
<div class="line"> <span class="keywordtype">char</span> tmstring[30];</div>
<div class="line"> strftime(tmstring,30,<span class="stringliteral">"%X"</span>,</div>
<div class="line"> localtime(&sending_time));</div>
<div class="line"> cout << <span class="stringliteral">"Tx ("</span> << hex << (int)ssrc </div>
<div class="line"> << <span class="stringliteral">"): sending salute "</span> << <span class="stringliteral">"no "</span> << dec << i </div>
<div class="line"> << <span class="stringliteral">", at "</span> << tmstring </div>
<div class="line"> << <span class="stringliteral">"..."</span> << endl;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Let's wait for the next cycle</span></div>
<div class="line"> Thread::sleep(TimerPort::getTimer());</div>
<div class="line"> TimerPort::incTimer(1000);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
<div class="line">{</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Construct the two main threads. they will not run yet.</span></div>
<div class="line"> ccRTP_Hello_Rx *receiver = <span class="keyword">new</span> ccRTP_Hello_Rx;</div>
<div class="line"> ccRTP_Hello_Tx *transmitter = <span class="keyword">new</span> ccRTP_Hello_Tx;</div>
<div class="line"> </div>
<div class="line"> cout << <span class="stringliteral">"This is rtphello, a very simple test program for ccRTP."</span> << </div>
<div class="line"> endl << <span class="stringliteral">"Strike [Enter] when you are fed up with it."</span> << endl;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Start execution of hello now.</span></div>
<div class="line"> receiver->start();</div>
<div class="line"> transmitter->start();</div>
<div class="line"></div>
<div class="line"> cin.get();</div>
<div class="line"></div>
<div class="line"> <span class="keyword">delete</span> transmitter;</div>
<div class="line"> <span class="keyword">delete</span> receiver;</div>
<div class="line"></div>
<div class="line"> cout << endl << <span class="stringliteral">"That's all."</span> << endl;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"></div>
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