// This method does almost everything.
void run(void){
// redefined from Thread.
// Before using ccRTP you should learn something about other
// CommonC++ classes. We need InetHostAddress...
// Construct loopback address
InetHostAddress local_ip;
local_ip = "127.0.0.1";
// Is that correct?
if( ! local_ip ){
// this is equivalent to `! local_ip.isInetAddress()'
cerr << ": IP address is not correct!" << endl;
exit();
}
cout << local_ip.getHostname() <<
" is going to listen to perself through " <<
local_ip << "..." << endl;
// ____Here comes the real RTP stuff____
// Construct the RTP socket
socket = new RTPSession(local_ip,RECEIVER_BASE,0);
// Set up receiver's connection
socket->setSchedulingTimeout(10000);
if( !socket->addDestination(local_ip,TRANSMITTER_BASE) )
cerr << "The receiver could not connect.";
// Let's check the queue (you should read the documentation
// so that you know what the queue is for).
socket->startRunning();
cout << "The RTP queue is ";
if( socket->isActive() )
cout << "active." << endl;
else
cerr << "not active." << endl;
cout << "Waiting for audio packets..." << endl;
// This will be useful for periodic execution.
TimerPort::setTimer(PERIOD);
setCancel(cancelImmediate);
// This is the main loop, where packets are sent and receipt.
socket->setPayloadFormat(StaticPayloadFormat(sptPCMU));
for( int i=0 ; true ; i++ ){
const AppDataUnit* adu;
do{
adu = socket->getData(socket->getFirstTimestamp());
if ( NULL == adu )
Thread::sleep(5);
else cout << ".";
}while ( (NULL == adu) || (adu->getSize() <= 0) );
// This is for buffering some packets at the
// receiver side, since playing smoothly
// without any reception buffer is almost
// impossible. Try commenting the two lines
// below, or stop transmission and continue
// later: you will probably hear noise or
// cracks.
if (i==0)
Thread::sleep(20);
::write(audiooutput,adu->getData(),adu->getSize());
cout << "." << flush;
// Let's wait for the next cycle
Thread::sleep(TimerPort::getTimer());
TimerPort::incTimer(PERIOD);
}
} // end of run
