| // audiorx. |
| // 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 |
| |
| // A very simple mu-law encoded audio player. |
| |
| // 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 player of \mu-law encoded RTP audio packets. I |
| // do not accept any arguments. |
| |
| #include <cstdio> |
| #include <cstdlib> |
| // Some consts common to audiorx and audiotx |
| #include <audio.h> |
| // In order to use ccRTP, the RTP stack of CommonC++, you only need to |
| // include ... |
| #include <ccrtp/rtp.h> |
| |
| #ifdef CCXX_NAMESPACES |
| using namespace ost; |
| using namespace std; |
| #endif |
| |
| /** |
| * @class ccRTP_AudioReceiver |
| * This is the class that will do almost everything. |
| */ |
| class ccRTP_AudioReceiver: public Thread, public TimerPort |
| { |
| private: |
| // This is the file we will write to (/dev/audio) |
| int audiooutput; |
| // The aforementioned file will be transmitted through this socket |
| RTPSession *socket; |
| |
| public: |
| // Constructor |
| ccRTP_AudioReceiver() { |
| audiooutput=open("/dev/audio",O_WRONLY/*|O_NDELAY*/); |
| |
| if( audiooutput > 0 ) { |
| cout << "Audio device is ready to play." << endl; |
| }else{ |
| cout << "I could not open /dev/audio " << endl; |
| exit(); |
| } |
| |
| socket=NULL; |
| } |
| |
| // Destructor. |
| ~ccRTP_AudioReceiver() { |
| terminate(); |
| delete socket; |
| ::close(audiooutput); |
| } |
| |
| // 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); |
| |
| if(::write(audiooutput,adu->getData(),adu->getSize()) < (ssize_t)adu->getSize()) |
| break; |
| |
| cout << "." << flush; |
| |
| // Let's wait for the next cycle |
| Thread::sleep(TimerPort::getTimer()); |
| TimerPort::incTimer(PERIOD); |
| } |
| |
| } // end of run |
| }; |
| |
| |
| int main(int argc, char *argv[]) |
| { |
| cout << "This is audiorx, a simple test program for ccRTP." << endl; |
| cout << "I am waiting for audio packets on port " << RECEIVER_BASE |
| << "." << endl; |
| cout << "Do you want to hear something? Run audiotx." << endl; |
| cout << "Strike [Enter] when you are fed up. Enjoy!." << endl; |
| |
| // Construct the main thread. |
| ccRTP_AudioReceiver *receiver = new ccRTP_AudioReceiver(); |
| |
| // Run it. |
| receiver->start(); |
| |
| cin.get(); |
| |
| cout << endl << "That's all." << endl; |
| |
| delete receiver; |
| |
| exit(0); |
| } |
| |
| /** EMACS ** |
| * Local variables: |
| * mode: c++ |
| * c-basic-offset: 4 |
| * End: |
| */ |
| |
| |
| |