testProgs/sapWatch.cpp File Reference

#include "Groupsock.hh"
#include "GroupsockHelper.hh"
#include "BasicUsageEnvironment.hh"
#include <stdio.h>

Include dependency graph for sapWatch.cpp:

Go to the source code of this file.

Functions
int	main (int argc, char **argv)
Variables
static unsigned const	maxPacketSize = 65536
static unsigned char	packet [maxPacketSize+1]

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Function Documentation

int main	(	int	argc,
		char **	argv
	)

Definition at line 28 of file sapWatch.cpp.

References BasicUsageEnvironment::createNew(), BasicTaskScheduler::createNew(), env, Groupsock::handleRead(), maxPacketSize, our_inet_addr(), and our_inet_ntoa().

                                {
  // 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* 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",
           our_inet_ntoa(fromAddress.sin_addr), packetSize);

    // Ignore the first 8 bytes (SAP header).
    if (packetSize < 8) {
      *env << "Ignoring short packet from "
           << our_inet_ntoa(fromAddress.sin_addr) << "%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((char*)(packet+8));
  }

  return 0; // only to prevent compiler warning
}

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Variable Documentation

unsigned const maxPacketSize = 65536 [static]

Definition at line 25 of file sapWatch.cpp.

unsigned char packet[maxPacketSize+1] [static]

Definition at line 26 of file sapWatch.cpp.

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