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<hr><h1>audiorx.cpp</h1>
<p>
<div class="fragment"><pre><font class="comment">// audiorx. </font>
<font class="comment">// A simple and amusing program for testing 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">// A very simple mu-law encoded audio player.</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 CommonC++ threads and</font>
<font class="comment">// TimerPort.</font>
<font class="comment">// I am a player of \mu-law encoded RTP audio packets. I </font>
<font class="comment">// do not accept any arguments.</font>
<font class="comment">// In order to use ccRTP, the RTP stack of CommonC++, you only need to</font>
<font class="comment">// include ...</font>
<font class="preprocessor">#include <cc++/<a class="code" href="rtp_h.html">rtp.h</a>></font>
<font class="comment">// Some consts common to audiorx and audiotx</font>
<font class="preprocessor">#include <audio.h></font>
<font class="keyword">class </font>ccRTP_AudioReceiver: <font class="keyword">public</font> <a name="_a0"></a><a class="code" href="class_Thread.html">Thread</a>, <font class="keyword">public</font> TimerPort
{
<font class="keyword">private</font>:
<font class="comment">// This is the file we will write to (/dev/audio)</font>
<font class="keywordtype">int</font> audiooutput;
<font class="comment">// The aforementioned file will be transmitted through this socket</font>
<a name="_a1"></a><a class="code" href="class_T_RTPSocket.html">RTPSocket</a> *socket;
<font class="keyword">public</font>:
<font class="comment">// Constructor</font>
ccRTP_AudioReceiver()<font class="keyword"></font>{
audiooutput=open(<font class="stringliteral">"/dev/audio"</font>,O_WRONLY<font class="comment">/*|O_NDELAY*/</font>);
<font class="keywordflow">if</font>( audiooutput > 0 ){
cout << <font class="stringliteral">"Audio device is ready to play."</font> << endl;
}<font class="keywordflow">else</font>{
cout << <font class="stringliteral">"I could not open /dev/audio "</font> << endl;
exit(0);
}
socket=NULL;
}
<font class="comment">// Destructor. </font>
~ccRTP_AudioReceiver()<font class="keyword"></font>{
Terminate();
<font class="keywordflow">if</font>( socket )
<font class="keyword">delete</font> socket;
close(audiooutput);
}
<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>
<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>
InetHostAddress local_ip;
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">": IP address is not correct!"</font> << endl;
exit(1);
}
cout << local_ip.getHostname() <<
<font class="stringliteral">" is going to listen to perself through "</font> <<
local_ip << <font class="stringliteral">"..."</font> << endl;
<font class="comment">// ____Here comes the real RTP stuff____</font>
<font class="comment">// Construct the RTP socket</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);
<font class="comment">// Set up receiver's connection</font>
socket->setTimeout(10000);
socket->setExpired(1000000);
socket->setGlobalKitchenDuration(40000);
<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">"The receiver could not connect."</font>;
<font class="comment">// Let's check the queue (you should read the documentation</font>
<font class="comment">// so that you know what the queue is for).</font>
cout << <font class="stringliteral">"The RTP queue is "</font>;
<font class="keywordflow">if</font>( socket-><a name="a4"></a><a class="code" href="class_RTPQueue.html#a20">RTPQueue::isActive</a>() )
cout << <font class="stringliteral">"active."</font> << endl;
<font class="keywordflow">else</font>
cerr << <font class="stringliteral">"not active."</font> << endl;
cout << <font class="stringliteral">"Waiting for audio packets..."</font> << endl;
<font class="comment">// This is not important.</font>
<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> buffer[PACKET_SIZE];
<font class="comment">// This will be useful for periodic execution.</font>
TimerPort::setTimer(PERIOD);
setCancel(THREAD_CANCEL_IMMEDIATE);
<font class="comment">// This is the main loop, where packets are sent and receipt.</font>
<font class="keywordflow">for</font>( <font class="keywordtype">int</font> i=0 ; <font class="keyword">true</font> ; i++ ){
<font class="keywordtype">int</font> count;
<font class="keywordflow">do</font>{
<font class="keyword">const</font> <a name="_a5"></a><a class="code" href="class_RTPData.html">RTPData</a> &d = socket->getCookedPacket();
count = d.<a name="a6"></a><a class="code" href="class_RTPData.html#a3">getSize</a>();
}<font class="keywordflow">while</font> (count <= 0);
<font class="comment">// This is for buffering some packets at the</font>
<font class="comment">// receiver side, since playing smoothly</font>
<font class="comment">// without any reception buffer is almost</font>
<font class="comment">// impossible. Try commenting the two lines</font>
<font class="comment">// below, or stop transmission and continue</font>
<font class="comment">// later: you will probably hear noise or</font>
<font class="comment">// cracks. </font>
<font class="comment">// Do not worry, this will soon be</font>
<font class="comment">// incorporated in ccRTP.</font>
<font class="keywordflow">if</font>(i==0)
ccxx_sleep(20);
write(audiooutput,buffer,count);
cout << <font class="stringliteral">"."</font><<flush;
<font class="comment">// Let's wait for the next cycle</font>
ccxx_sleep(TimerPort::getTimer());
TimerPort::incTimer(PERIOD);
}
} <font class="comment">// end of Run</font>
};
<font class="keywordtype">void</font> main(<font class="keywordtype">int</font> argc, <font class="keywordtype">char</font> *argv[])<font class="keyword"></font>{
cout << <font class="stringliteral">"This is audiorx, a simple test program for ccRTP."</font> << endl;
cout << <font class="stringliteral">"I am waiting for audio packets on port "</font> << RECEIVER_BASE
<< <font class="stringliteral">"."</font> << endl;
cout << <font class="stringliteral">"Do you want to hear something? Run audiotx."</font> << endl;
cout << <font class="stringliteral">"Strike [Enter] when you are fed up. Enjoy!."</font> << endl;
<font class="comment">// Construct the main thread. </font>
ccRTP_AudioReceiver *receiver = <font class="keyword">new</font> ccRTP_AudioReceiver();
<font class="comment">// Run it.</font>
receiver->Start();
cin.get();
cout << endl << <font class="stringliteral">"That's all."</font> << endl;
<font class="keyword">delete</font> receiver;
exit(0);
}
</div></pre><hr><address><small>Generated at Fri Oct 5 10:28:25 2001 for ccRTP by
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