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<h1>audiotx.cpp</h1><div class="fragment"><pre class="fragment"><span class="comment">// audiotx. </span>
<span class="comment">// A simple and amusing program for testing basic features of ccRTP.</span>
<span class="comment">// Copyright (C) 2001,2002 Federico Montesino <fedemp@altern.org></span>
<span class="comment">// </span>
<span class="comment">// This program is free software; you can redistribute it and/or modify</span>
<span class="comment">// it under the terms of the GNU General Public License as published by</span>
<span class="comment">// the Free Software Foundation; either version 2 of the License, or</span>
<span class="comment">// (at your option) any later version.</span>
<span class="comment">// </span>
<span class="comment">// This program is distributed in the hope that it will be useful,</span>
<span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<span class="comment">// GNU General Public License for more details.</span>
<span class="comment">// </span>
<span class="comment">// You should have received a copy of the GNU General Public License</span>
<span class="comment">// along with this program; if not, write to the Free Software</span>
<span class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
<span class="comment">// This is an introductory example file that illustrates basic usage</span>
<span class="comment">// of ccRTP. You will also see a bit on how to use CommonC++ threads and</span>
<span class="comment">// TimerPort.</span>
<span class="comment">// I am a transmitter of \mu-law encoded RTP audio packets. In order</span>
<span class="comment">// to hear what I transmit, you should be running my colleague</span>
<span class="comment">// `audiorx'. You can give me the name of a .au file as argument.</span>
<span class="preprocessor">#include <cstdio></span>
<span class="preprocessor">#include <cstdlib></span>
<span class="comment">// Some consts common to audiotx and audiorx</span>
<span class="preprocessor">#include <audio.h></span>
<span class="comment">// In order to use ccRTP, the RTP stack of CommonC++, you only need to</span>
<span class="comment">// include ...</span>
<span class="preprocessor">#include <<a class="code" href="rtp_8h.html">ccrtp/rtp.h</a>></span>
<span class="preprocessor">#ifdef CCXX_NAMESPACES</span>
<span class="preprocessor"></span><span class="keyword">using</span> <span class="keyword">namespace </span>ost;
<span class="keyword">using</span> <span class="keyword">namespace </span>std;
<span class="preprocessor">#endif</span>
<span class="preprocessor"></span>
<span class="keyword">class </span>ccRTP_AudioTransmitter: <span class="keyword">public</span> Thread, <span class="keyword">public</span> TimerPort
{
<span class="keyword">private</span>:
<span class="comment">// This is the descriptor of the file we will read from</span>
<span class="comment">// (commonly, /dev/audio or a .au file)</span>
<span class="keywordtype">int</span> audioinput;
<span class="comment">// If we are sending a .au file</span>
<span class="keywordtype">bool</span> sendingfile;
<span class="comment">// The aforementioned file will be transmitted through this socket</span>
<a name="_a7"></a><a class="code" href="class_single_thread_r_t_p_session.html">RTPSession</a> *socket;
<span class="keyword">public</span>:
<span class="comment">// Constructor. If it is given a file name, this thread will</span>
<span class="comment">// transmit that file. If it is not, /dev/audio input is</span>
<span class="comment">// transmitted</span>
ccRTP_AudioTransmitter(<span class="keywordtype">char</span> *filename=<span class="stringliteral">""</span>){
<span class="keywordflow">if</span>( !strcmp(filename,<span class="stringliteral">""</span>) ){
filename=<span class="stringliteral">"/dev/audio"</span>;
sendingfile = <span class="keyword">false</span>;
}<span class="keywordflow">else</span>{
sendingfile = <span class="keyword">true</span>;
}
audioinput=open(filename,O_RDONLY|O_NDELAY);
<span class="keywordflow">if</span>( audioinput >= 0 ){
cout << <span class="stringliteral">"Ready to transmit "</span> << filename << <span class="stringliteral">"."</span> <<endl;
}<span class="keywordflow">else</span>{
cout << <span class="stringliteral">"I could not open "</span> << filename << <span class="stringliteral">"."</span> << endl;
exit();
}
socket=NULL;
}
<span class="comment">// Destructor. </span>
~ccRTP_AudioTransmitter(){
terminate();
<span class="keyword">delete</span> socket;
::close(audioinput);
}
<span class="comment">// This method does almost everything.</span>
<span class="keywordtype">void</span> run(<span class="keywordtype">void</span>) {
<span class="comment">// redefined from Thread.</span>
<span class="comment">// Before using ccRTP you should learn something about other</span>
<span class="comment">// CommonC++ classes. We need InetHostAddress...</span>
<span class="comment">// Construct loopback address</span>
InetHostAddress local_ip;
local_ip = <span class="stringliteral">"127.0.0.1"</span>;
<span class="comment">// Is that correct?</span>
<span class="keywordflow">if</span>( ! local_ip ){
<span class="comment">// this is equivalent to `! local_ip.isInetAddress()'</span>
cerr << <span class="stringliteral">": IP address is not correct!"</span> << endl;
exit();
}
cout << local_ip.getHostname() <<
<span class="stringliteral">" is going to transmit audio to perself through "</span> <<
local_ip << <span class="stringliteral">"..."</span> << endl;
<span class="comment">// ____Here comes the real RTP stuff____</span>
<span class="comment">// Construct the RTP socket.</span>
socket = <span class="keyword">new</span> <a name="a8"></a><a class="code" href="group__sessions.html#ga0">RTPSession</a>(local_ip,TRANSMITTER_BASE);
<span class="comment">// Set up connection</span>
socket->setSchedulingTimeout(10000);
<span class="keywordflow">if</span>( !socket->addDestination(local_ip,RECEIVER_BASE) )
cerr << <span class="stringliteral">"I could not connect."</span>;
socket->setPayloadFormat(<a name="_a9"></a><a class="code" href="class_static_payload_format.html">StaticPayloadFormat</a>(<a name="a10"></a><a class="code" href="group__payload.html#gga2a2">sptPCMU</a>));
socket->startRunning();
cout << <span class="stringliteral">"The RTP queue service thread is "</span>;
<span class="keywordflow">if</span>( socket->isActive() )
cout << <span class="stringliteral">"active."</span> << endl;
<span class="keywordflow">else</span>
cerr << <span class="stringliteral">"not active."</span> << endl;
cout << <span class="stringliteral">"Transmitting "</span> << PACKET_SIZE
<< <span class="stringliteral">" octects long packets "</span>
<< <span class="stringliteral">"every "</span> << PERIOD << <span class="stringliteral">" milliseconds..."</span> << endl;
<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> buffer[PACKET_SIZE];
<span class="keywordtype">int</span> count=PACKET_SIZE;
<span class="comment">// This will be useful for periodic execution</span>
TimerPort::setTimer(PERIOD);
setCancel(cancelImmediate);
<span class="comment">// This is the main loop, where packets are transmitted.</span>
<span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = 0 ; (!sendingfile || count > 0) ; i++ ){
count = ::read(audioinput,buffer,PACKET_SIZE);
<span class="keywordflow">if</span>( count > 0 ){
<span class="comment">// send an RTP packet, providing timestamp,</span>
<span class="comment">// payload type and payload.</span>
socket->putData(PACKET_SIZE*i,buffer,
PACKET_SIZE);
}
cout << <span class="stringliteral">"."</span> << flush;
<span class="comment">// Let's wait for the next cycle</span>
Thread::sleep(TimerPort::getTimer());
TimerPort::incTimer(PERIOD);
}
cout << endl << <span class="stringliteral">"I have got no more data to send. "</span> <<endl;
}
};
<span class="keywordtype">int</span>
main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[]){
cout << <span class="stringliteral">"This is audiotx, a simple test program for ccRTP."</span> << endl;
cout << <span class="stringliteral">"You should have run audiorx (the server/receiver) before."</span>
<< endl;
cout << <span class="stringliteral">"Strike [Enter] when you are fed up. Enjoy!."</span> << endl;
ccRTP_AudioTransmitter *transmitter;
<span class="comment">// Construct the main thread. It will not run yet.</span>
<span class="keywordflow">if</span> ( argc == 2 )
transmitter = <span class="keyword">new</span> ccRTP_AudioTransmitter(argv[1]);
<span class="keywordflow">else</span>
transmitter = <span class="keyword">new</span> ccRTP_AudioTransmitter();
<span class="comment">// Start transmitter thread.</span>
transmitter->start();
cin.get();
cout << endl << <span class="stringliteral">"That's all."</span> << endl;
<span class="keyword">delete</span> transmitter;
exit(0);
}
</pre></div> <hr size="1"><address style="align: right;"><small>Generated on Fri Dec 9 22:32:03 2005 for ccRTP by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.4 </small></address>
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