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<hr><h1>audiotx.cpp</h1>
<p>
<div class="fragment"><pre><font class="comment">// audiotx. </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">// 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 transmitter of \mu-law encoded RTP audio packets. In order</font>
<font class="comment">// to hear what I transmit, you should be running my colleague</font>
<font class="comment">// `audiorx'. You can give me the name of a .au file as argument.</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 audiotx and audiorx</font>
<font class="preprocessor">#include <audio.h></font>
<font class="keyword">class </font>ccRTP_AudioTransmitter: <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 descriptor of the file we will read from</font>
<font class="comment">// (commonly, /dev/audio or a .au file)</font>
<font class="keywordtype">int</font> audioinput;
<font class="comment">// If we are sending a .au file</font>
<font class="keywordtype">bool</font> sendingfile;
<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. If it is given a file name, this thread will</font>
<font class="comment">// transmit that file. If it is not, /dev/audio input is</font>
<font class="comment">// transmitted</font>
ccRTP_AudioTransmitter(<font class="keywordtype">char</font> *filename=<font class="stringliteral">""</font>)<font class="keyword"></font>{
<font class="keywordflow">if</font>( !strcmp(filename,<font class="stringliteral">""</font>) ){
filename=<font class="stringliteral">"/dev/audio"</font>;
sendingfile = <font class="keyword">false</font>;
}<font class="keywordflow">else</font>{
sendingfile = <font class="keyword">true</font>;
}
audioinput=open(filename,O_RDONLY|O_NDELAY);
<font class="keywordflow">if</font>( audioinput >= 0 ){
cout << <font class="stringliteral">"Ready to transmit "</font> << filename << <font class="stringliteral">"."</font> <<endl;
}<font class="keywordflow">else</font>{
cout << <font class="stringliteral">"I could not open "</font> << filename << <font class="stringliteral">"."</font> << endl;
exit(0);
}
socket=NULL;
}
<font class="comment">// Destructor. </font>
~ccRTP_AudioTransmitter()<font class="keyword"></font>{
Terminate();
<font class="keywordflow">if</font>( socket )
<font class="keyword">delete</font> socket;
close(audioinput);
}
<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 transmit audio 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,TRANSMITTER_BASE,0);
<font class="comment">// Set up connection</font>
socket->setTimeout(10000);
socket->setExpired(1000000);
<font class="keywordflow">if</font>( socket-><a name="a3"></a><a class="code" href="class_T_RTPSocket.html#a3">Connect</a>(local_ip,RECEIVER_BASE) < 0 )
cerr << <font class="stringliteral">"I could not connect."</font>;
<font class="comment">// Let's 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">"Transmitting "</font> << PACKET_SIZE
<< <font class="stringliteral">" octects long packets "</font>
<< <font class="stringliteral">"every "</font> << PERIOD << <font class="stringliteral">" milliseconds..."</font> << endl;
<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> buffer[PACKET_SIZE];
<font class="keywordtype">int</font> count=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 transmitted.</font>
<font class="keywordflow">for</font>( <font class="keywordtype">int</font> i=0 ; (!sendingfile || count > 0) ; i++ ){
count=read(audioinput,buffer,PACKET_SIZE);
<font class="keywordflow">if</font>( count > 0 ){
<font class="comment">// send an RTP packet, providing timestamp,</font>
<font class="comment">// payload type and payload.</font>
socket->putPacket(PACKET_SIZE*i,
RTP_PAYLOAD_PCMU,
buffer,
PACKET_SIZE);
}
cout << <font class="stringliteral">"."</font><<flush;
<font class="comment">// Let's wait for the next cycle</font>
ccxx_sleep(TimerPort::getTimer());
TimerPort::incTimer(PERIOD);
}
cout << endl << <font class="stringliteral">"I have got no more data to send. "</font> <<endl;
} <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 audiotx, a simple test program for ccRTP."</font> << endl;
cout << <font class="stringliteral">"You should have run audiorx (the server/receiver) before."</font>
<< endl;
cout << <font class="stringliteral">"Strike [Enter] when you are fed up. Enjoy!."</font> << endl;
ccRTP_AudioTransmitter *transmitter;
<font class="comment">// Construct the main thread. It will not run yet.</font>
<font class="keywordflow">if</font> ( argc == 2 )
transmitter = <font class="keyword">new</font> ccRTP_AudioTransmitter(argv[1]);
<font class="keywordflow">else</font>
transmitter = <font class="keyword">new</font> ccRTP_AudioTransmitter();
<font class="comment">// Start transmission now.</font>
transmitter->Start();
cin.get();
cout << endl << <font class="stringliteral">"That's all."</font> << endl;
<font class="keyword">delete</font> transmitter;
exit(0);
}
</div></pre><hr><address><small>Generated at Fri Oct 5 10:28:25 2001 for ccRTP by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.gif" alt="doxygen" align="middle" border=0
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© 1997-2001</small></address>
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