| // audiotx. |
| // A simple and amusing program for testing basic features of ccRTP. |
| // Copyright (C) 2001,2002 Federico Montesino <fedemp@altern.org> |
| // |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 2 of the License, or |
| // (at your option) any later version. |
| // |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| |
| // This is an introductory example file that illustrates basic usage |
| // of ccRTP. You will also see a bit on how to use CommonC++ threads and |
| // TimerPort. |
| |
| // I am a transmitter of \mu-law encoded RTP audio packets. In order |
| // to hear what I transmit, you should be running my colleague |
| // `audiorx'. You can give me the name of a .au file as argument. |
| |
| #include <cstdio> |
| #include <cstdlib> |
| // Some consts common to audiotx and audiorx |
| #include <audio.h> |
| // In order to use ccRTP, the RTP stack of CommonC++, you only need to |
| // include ... |
| #include <ccrtp/rtp.h> |
| #include <fcntl.h> |
| |
| using namespace ost; |
| using namespace std; |
| |
| // TODO: a temporary fix....just to allow building on broken platforms... |
| #ifndef O_NDELAY |
| #define O_NDELAY 0 |
| #endif |
| |
| /** |
| * @class ccRTP_AudioTransmitter |
| * This is the class that will do almost everything. |
| */ |
| class ccRTP_AudioTransmitter: public Thread, public TimerPort |
| { |
| private: |
| // This is the descriptor of the file we will read from |
| // (commonly, /dev/audio or a .au file) |
| int audioinput; |
| |
| // If we are sending a .au file |
| bool sendingfile; |
| |
| // The aforementioned file will be transmitted through this socket |
| RTPSession *socket; |
| |
| public: |
| // Constructor. If it is given a file name, this thread will |
| // transmit that file. If it is not, /dev/audio input is |
| // transmitted |
| ccRTP_AudioTransmitter(char *filename=(char *)"") { |
| |
| if( !strcmp(filename,"") ) { |
| filename=(char *)"/dev/audio"; |
| sendingfile = false; |
| }else{ |
| sendingfile = true; |
| } |
| |
| audioinput=open(filename,O_RDONLY|O_NDELAY); |
| |
| if( audioinput >= 0 ) { |
| cout << "Ready to transmit " << filename << "." <<endl; |
| }else{ |
| cout << "I could not open " << filename << "." << endl; |
| exit(); |
| } |
| |
| socket=NULL; |
| } |
| |
| // Destructor. |
| ~ccRTP_AudioTransmitter() { |
| terminate(); |
| delete socket; |
| ::close(audioinput); |
| } |
| |
| // 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 transmit audio to perself through " << |
| local_ip << "..." << endl; |
| |
| // ____Here comes the real RTP stuff____ |
| |
| // Construct the RTP socket. |
| socket = new RTPSession(local_ip,TRANSMITTER_BASE); |
| |
| // Set up connection |
| socket->setSchedulingTimeout(10000); |
| if( !socket->addDestination(local_ip,RECEIVER_BASE) ) |
| cerr << "I could not connect."; |
| |
| socket->setPayloadFormat(StaticPayloadFormat(sptPCMU)); |
| |
| socket->startRunning(); |
| cout << "The RTP queue service thread is "; |
| if( socket->isActive() ) |
| cout << "active." << endl; |
| else |
| cerr << "not active." << endl; |
| |
| cout << "Transmitting " << PACKET_SIZE |
| << " octects long packets " |
| << "every " << PERIOD << " milliseconds..." << endl; |
| |
| unsigned char buffer[PACKET_SIZE]; |
| int count=PACKET_SIZE; |
| |
| // This will be useful for periodic execution |
| TimerPort::setTimer(PERIOD); |
| |
| // This is the main loop, where packets are transmitted. |
| for( int i = 0 ; (!sendingfile || count > 0) ; i++ ) { |
| |
| count = ::read(audioinput,buffer,PACKET_SIZE); |
| if( count > 0 ) { |
| // send an RTP packet, providing timestamp, |
| // payload type and payload. |
| socket->putData(PACKET_SIZE*i,buffer, |
| PACKET_SIZE); |
| } |
| cout << "." << flush; |
| |
| // Let's wait for the next cycle |
| Thread::sleep(TimerPort::getTimer()); |
| TimerPort::incTimer(PERIOD); |
| } |
| cout << endl << "I have got no more data to send. " <<endl; |
| } |
| }; |
| |
| int main(int argc, char *argv[]) |
| { |
| cout << "This is audiotx, a simple test program for ccRTP." << endl; |
| cout << "You should have run audiorx (the server/receiver) before." << endl; |
| cout << "Strike [Enter] when you are fed up. Enjoy!." << endl; |
| |
| ccRTP_AudioTransmitter *transmitter; |
| |
| // Construct the main thread. It will not run yet. |
| if ( argc == 2 ) |
| transmitter = new ccRTP_AudioTransmitter(argv[1]); |
| else |
| transmitter = new ccRTP_AudioTransmitter(); |
| |
| // Start transmitter thread. |
| transmitter->start(); |
| |
| cin.get(); |
| |
| cout << endl << "That's all." << endl; |
| |
| delete transmitter; |
| |
| exit(0); |
| } |
| |
| /** EMACS ** |
| * Local variables: |
| * mode: c++ |
| * c-basic-offset: 4 |
| * End: |
| */ |
| |
| |
| |
| |