| /********** |
| This library is free software; you can redistribute it and/or modify it under |
| the terms of the GNU Lesser General Public License as published by the |
| Free Software Foundation; either version 3 of the License, or (at your |
| option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| |
| This library 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 Lesser General Public License for |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this library; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // Copyright (c) 1996-2020, Live Networks, Inc. All rights reserved |
| // A program that receives and prints SDP/SAP announcements |
| // (on the default SDP/SAP directory: 224.2.127.254/9875) |
| |
| #include "Groupsock.hh" |
| #include "GroupsockHelper.hh" |
| #include "BasicUsageEnvironment.hh" |
| #include <stdio.h> |
| |
| static unsigned const maxPacketSize = 65536; |
| static unsigned char packet[maxPacketSize+1]; |
| |
| int main(int argc, char** argv) { |
| // Begin by setting up our usage environment: |
| TaskScheduler* scheduler = BasicTaskScheduler::createNew(); |
| UsageEnvironment* env = BasicUsageEnvironment::createNew(*scheduler); |
| |
| |
| // Create a 'groupsock' for the input multicast group,port: |
| char const* sessionAddressStr = "224.2.127.254"; |
| struct in_addr sessionAddress; |
| sessionAddress.s_addr = our_inet_addr(sessionAddressStr); |
| |
| const Port port(9875); |
| const unsigned char ttl = 0; // we're only reading from this mcast group |
| |
| Groupsock inputGroupsock(*env, sessionAddress, port, ttl); |
| |
| // Start reading and printing incoming packets |
| // (Because this is the only thing we do, we can just do this |
| // synchronously, in a loop, so we don't need to set up an asynchronous |
| // event handler like we do in most of the other test programs.) |
| unsigned packetSize; |
| struct sockaddr_in fromAddress; |
| while (inputGroupsock.handleRead(packet, maxPacketSize, |
| packetSize, fromAddress)) { |
| printf("\n[packet from %s (%d bytes)]\n", AddressString(fromAddress).val(), packetSize); |
| |
| // Ignore the first 8 bytes (SAP header). |
| if (packetSize < 8) { |
| *env << "Ignoring short packet from " << AddressString(fromAddress).val() << "%s!\n"; |
| continue; |
| } |
| |
| // convert "application/sdp\0" -> "application/sdp\0x20" |
| // or all other nonprintable characters to blank, except new line |
| unsigned idx = 8; |
| while (idx < packetSize) { |
| if (packet[idx] < 0x20 && packet[idx] != '\n') packet[idx] = 0x20; |
| idx++; |
| } |
| |
| packet[packetSize] = '\0'; // just in case |
| printf("%s", (char*)(packet+8)); |
| } |
| |
| return 0; // only to prevent compiler warning |
| } |