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75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// Copyright (c) 1996-2025, Live Networks, Inc. All rights reserved
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// A program that receives and prints SDP/SAP announcements
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// (on the default SDP/SAP directory: 224.2.127.254/9875)
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#include "Groupsock.hh"
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#include "GroupsockHelper.hh"
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#include "BasicUsageEnvironment.hh"
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#include <stdio.h>
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static unsigned const maxPacketSize = 65536;
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static unsigned char packet[maxPacketSize+1];
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int main(int argc, char** argv) {
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// Begin by setting up our usage environment:
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TaskScheduler* scheduler = BasicTaskScheduler::createNew();
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UsageEnvironment* env = BasicUsageEnvironment::createNew(*scheduler);
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// Create a 'groupsock' for the input multicast group,port:
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char const* sessionAddressStr = "224.2.127.254";
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NetAddressList sessionAddresses(sessionAddressStr);
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struct sockaddr_storage sessionAddress;
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copyAddress(sessionAddress, sessionAddresses.firstAddress());
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const Port port(9875);
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const unsigned char ttl = 0; // we're only reading from this mcast group
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Groupsock inputGroupsock(*env, sessionAddress, port, ttl);
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// Start reading and printing incoming packets
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// (Because this is the only thing we do, we can just do this
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// synchronously, in a loop, so we don't need to set up an asynchronous
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// event handler like we do in most of the other test programs.)
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unsigned packetSize;
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struct sockaddr_storage fromAddress;
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while (inputGroupsock.handleRead(packet, maxPacketSize,
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packetSize, fromAddress)) {
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printf("\n[packet from %s (%d bytes)]\n", AddressString(fromAddress).val(), packetSize);
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// Ignore the first 8 bytes (SAP header).
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if (packetSize < 8) {
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*env << "Ignoring short packet from " << AddressString(fromAddress).val() << "%s!\n";
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continue;
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}
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// convert "application/sdp\0" -> "application/sdp\0x20"
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// or all other nonprintable characters to blank, except new line
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unsigned idx = 8;
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while (idx < packetSize) {
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if (packet[idx] < 0x20 && packet[idx] != '\n') packet[idx] = 0x20;
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idx++;
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}
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packet[packetSize] = '\0'; // just in case
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printf("%s", (char*)(packet+8));
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}
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return 0; // only to prevent compiler warning
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}
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