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#!/usr/bin/perl

# compute packet stream quality statistics for UDP/RTP from network or captured files(pcap)
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# Base Olav Kvittem
# Mpeg support Odd Rune Mykkeltveit Lykkbo,  2009-2010
# Mos values computation Gurvinder Singh, 2010-05-07
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# XML, RTMP, TCP support, Pål Moen Møst, 2011.
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# use Socket;
use IO::Socket qw(:DEFAULT :crlf);
use IO::Socket::INET;
use IO::Socket::Multicast;
use IO::Select;
use Net::Pcap;
use NetPacket::Ethernet qw(:strip);
use NetPacket::IP;
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use NetPacket::IP qw(:strip  :protos);;
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use NetPacket::UDP;
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use NetPacket::TCP;
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use Net::IPv6Addr;
use NetPacket::IPv6 qw(ipv6_strip);
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#use Net::RTP;
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use Net::RTP::Packet;
use Time::HiRes qw/ sleep time tv_interval gettimeofday/;
use Data::Dumper;
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use threads;
use threads::shared;
use Pod::Usage;
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#use bigint qw/ hex oct/;
use Math::BigInt;
use Math::BigFloat;
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use Carp;
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#RTMP implementation *experimental*
use rtmp::client qw(rtmp_connect rtmp_play rtmp_call get_chunk_ids);
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use constant MTU => 1580;
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#XML
use XML::DOM;
use XML::Twig;
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#use mpegpackets;
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$DEFAULT_PORT = 1955;
my $timeout=1 ; # frac seconds to wait for receiving packets

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#my oh my,more globals
my ($rtmp,$period,$last,$debug,$swfurl,$pageurl,$flash_version,$reconnect);

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require "newgetopt.pl";
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@opts=('list', 'man','fullformat', 'net', 'rtp', 'mpeg', 'pcap', 'crude', 'bins=s', 'log', 'nperiod=s', 'period=s', 'last=s', 'packets=s', 'src=s', 'flow_key=s', 'flow_no=s', 'flow_min=s', 'nohead', 'dump=s', 'format=s', 'id=s', 'sum=s', 'ttl', 'rtt=s', 'codec=s', 'log', 'verbose', 'v', 'h', 'debug', 'av','xml=s', 'rtmp','tcp', 'port=s','swfurl=s','pageurl=s','flashversion=s','new','q','exclude=s','report=s', 'filename','test','ipv6','p=s','name=s','tcp_t');
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&NGetOpt(@opts) || die pod2usage(1);
die pod2usage(1)  if $opt_h;
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$continous= ! $opt_packets;
$opt_v=$opt_v or $opt_verbose;
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my $codec = $opt_codec || 'G.711';
my $rtt = $opt_rtt || 10;		# ms round trip time of the connection
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pod2usage(-verbose => 2 ) if $opt_man;
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my @streams=@ARGV;

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if ($opt_bins){
    @bins=split(/,/, $opt_bins);
}
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if ($opt_report){
    @filter=split(/,/, $opt_report);
}
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my $format = $opt_format || "pretty";

my %hdr=();
my $err="";
my $us=0; # current packet time in us
my $nkill=0;
my $nint=0;
my $n_packets=0;
my $endstream=0;
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my $period_num = 0;
my $pcr_count = 0;
my $pts_count =  0;
my $doc;
my $xml;
my $xml_printed= 0;
my $last_stream;
my $file_flag;
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my $offline;
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my $lost_counter  = 0;
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#TCP STUFF
my $thr;
my $rtmp_port:shared = 1935; 
my $rtmp_addr:shared;
my %tcp_packet_stats:shared = ();
my %bw_stats:shared = ();
my %seq_stats:shared = ();
my %seq_stats_n =();
my $n_seq_num:shared=0;
my $rtmp_stream_start:shared;
my $tcp_stop:shared;
my %hash : shared;

my $packet_re_num:shared=0;
$seq_stats{'p_seq_num'} = 0;
$seq_stats{'p_tcp_time_stamp'} = 0;
$seq_stats{'p_tcp_time_stamp_echo'} = 0;
$seq_stats{'real_last_time'} = 0;
#init packetstats
$tcp_packet_stats{'pkt_lost'} = 0;
$tcp_packet_stats{'pkt_late'} = 0;
$tcp_packet_stats{'pkt_dup'} = 0 ;
$tcp_packet_stats{'pkt_retrans'} = 0;

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my %offset_bytes =();
my %network_info =();
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my $start_time = time();
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#MPEG-TS measurement globals (most are reset in init)
my $CHECK_NUM_TSP = 2;
#globals for mpeg ts 
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#a tabel for transport streams pids. aleternativ to PAT impl.
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my %pcr_pid = ();
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my $TS;
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my @cc = ();
my $discontinuities = 0;
my %last_ccs = ();
my $packets_between_pcr = 0;
#my $PTS_MAX = 95443.7176888888888888
my $PTS_MAX = 95443;
my $PCR_MAX = 95443;
# pcr_stats {filename/handle}
my %pcr_stats = ();
#PTS-stats {filename/handle}
my %pts_stats = ();
my %mpeg_stats = ();
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my %jitter_stats = ();
	
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#PTS stuff
#my $real_time = time();
my $late_video_packets = 0;

#CC distribution
my $num_cc = 0;
my %cc_dist = ();
my %pid_next_cc = ();

my %dist1 = ();
my %dist2 = ();

$opt_period = $opt_last if not $opt_period;

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$file_flag = 1 if $opt_filename;

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#MPEG-TS END
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$SIG{USR2} = sub {confess "Caught by SIGUSR2"; };

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$SIG{INT} = sub { $uninterrupted=0; # return if $nint++  < 1;
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		  &display_stats();
		  &end_xml() if $opt_xml;
		  &handle_threads()  if ($opt_tcp and $opt_rtmp);
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		  die "End after interrupt.\n";exit(0) };
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$SIG{KILL} = sub { $uninterrupted=0; # return if $nkill++ < 1;
		   &display_stats();  die "End after kill.\n";exit(0) };
$SIG{ALRM} = sub { 
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#   Writes stats to file if option XML is given. -PMM
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#    die "No packets received" if $n_packets < 1;
#    $uninterrupted=0;
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    &display_stats() if  !$endstream;
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#	die "End after alarm\n"; 
#	return(0);
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    $endstream=1;
    print "endstream=1" if $opt_debug;
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};
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if ($opt_dump){
    open DUMP, ">$opt_dump";
}
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 if ($opt_test){
 	if($opt_mpeg || $opt_rtp || $opt_tcp_t){
 		&unit_test;
 	}
 	else {
 		print "You need to choose a test. (mpeg, tcp or rtp) \n";
 	}
 }
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if ($opt_pcap || ($opt_tcp && !$opt_rtmp)){ # listen in parallell
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    alarm($opt_last) if $opt_last; 
    $uninterrupted=1;
    $endstream=0;
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    eat_pcap_streams(@streams);
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    &display_stats() if !$opt_xml;
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} else { # listen serially
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	my $stream_count;
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    #my $ln = @streams;
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    foreach $id (@streams) {
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	alarm($opt_last) if $opt_last;
	++$stream_count;
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	#$last_stream = 1 if $stream_count == ($ln);
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	#print "count $stream_count  lengde  $ln \n";
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	$uninterrupted=1;
	$endstream=0;
	init_file($id);
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	eat_stream($id) if (!($opt_tcp || $opt_rtmp));
	&rtmp_eat_stream($id,$opt_period, $opt_last,0,$opt_debug,$opt_swfurl,$opt_pageurl,$opt_flashversion) if $opt_rtmp;
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	#&eat_tcp($id,$opt_port) if $opt_tcp && !$opt_rtmp;
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	if (! ( $opt_list || $opt_sum)){
	    &display_stats() if !$endstream;
	}
	last if ! $uninterrupted;
    }
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}
&list_flows if $opt_list;
&display_stats() if $opt_sum;
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&display_bins if $opt_bins;
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&end_xml() if $opt_xml;
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exit(0);
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#
sub unit_test {
	my $test_data = shift;
	#streams =  "rtp_158.38.130.110_6711_1.pcap";
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	if ($opt_mpeg){
		@streams = "testing/pcap/testdata_mpeg.pcap";
		@filter = qw "video audio";
	}
	@streams = "testing/pcap/testdata_rtp.pcap" if $opt_rtp;
	@streams = "testing/pcap/testdata_tcp.pcap" if $opt_tcp_t;
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	$opt_xml = "tmp_testdata.xml";
	$opt_q =  1;
	$opt_v = 1;
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	#print $streams[0], "\n";
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}
sub unit_test_2{
	#my ($orgnial_test) = &feed_data("file",rtp_file.xml);
	my $test_data;
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	$test_data = "testing/xml/testdata_mpeg.xml" if $opt_mpeg;
	$test_data = "testing/xml/testdata_rtp.xml" if $opt_rtp;
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	#$test_data = "udp_testdata" if $opt_net;
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	$test_data = "testing/xml/testdata_tcp.xml" if $opt_tcp;
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	my ($orginal_test) = &xml_parser($test_data);
	my ($new_test) = &xml_parser("tmp_testdata.xml");
	print Dumper($orginal_test), "\n", Dumper($new_test)if $opt_debug;
	my $ignore_pattern = "jitter";  #PCR jitter is based on delta local time. 
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	my $ignore_pattern2  = "dwell";
	my $ignore_pattern3 ="delay_factor";
	my $ignore_pattern4 ="gap";
	print "Checking values ....\n";
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	for my $k1(keys %$orginal_test){
		if ($orginal_test->{ $k1} != $new_test->{ $k1} and $orginal_test->{ $k1} !~ m/HASH/) {
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			print "different value @ $k1, value: $orginal_test->{$k1}, differs from value: $new_test->{$k1}\n";
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		}
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		else {
			printf "%2s %2s\n", "OK  @ ", "$k1 ";
		}
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		for my $k2 ( keys %{$orginal_test->{ $k1}} ) {
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			if ( ($orginal_test->{ $k1}{$k2} != $new_test->{ $k1}{$k2}) and ($k2 !~ m/$ignore_pattern/) and ($k2 !~ m/$ignore_pattern2/) and ($k2 !~ m/$ignore_pattern3/) and ($k2 !~ m/$ignore_pattern4/)){
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				print "different value @ $k1-> $k2, value: $orginal_test->{$k1}{$k2} differs from, value: $new_test->{$k1}{$k2}\n";
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			}
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		}
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	}
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	print "Test complete \n";
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}
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sub xml_parser {
my $file = shift;
my $parser = new XML::DOM::Parser;
my $doc = $parser->parsefile ($file);
my $root = $doc->getFirstChild();
my $nodelist = $root->getChildNodes();
my $node = $nodelist->item(1);
my $dup;
my $flow_childs = $node->getChildNodes();
my @test_array = ();
my %test_hash = ();
foreach my $child ($node->getChildNodes()) {
    if ($child->getNodeType == ELEMENT_NODE) {
		if ($child->getChildNodes()){
			my @children = $child->getChildNodes();
			my $l = @children;
			if ($l > 1){
			#print "=== " ,$child->getNodeName(), " === \n";
			if (exists $test_hash{$child->getNodeName()}){
				 		$dup +=1;
				 	}
			foreach my $grandchild ($child->getChildNodes()){
				 if ($grandchild->getNodeType == ELEMENT_NODE){
				 	#print $grandchild->getNodeName(), "\n";
				 	eval {
				    	$test_hash{$child->getNodeName().$dup}{$grandchild->getNodeName()}=  $grandchild->getFirstChild()->getData();
				 	};
					if ($@){
					};
				 }
				}
			}
			else {
        		$test_hash{'flow'}{$child->getNodeName()} =  $child->getFirstChild()->getData();
     		}	
     	 }
      } 
	}
	return (\%test_hash)
}
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sub http_stream_client {
	my $f = shift;
	my $playlist = get("$f");
	my @list_items  = split(/\n/,$playlist);
	my @streams;
	my $duration;
	my $regex = "http://";
	my $p_chunk;
	while(1){
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		foreach my $item (@list_items){
			my @tmp_streams= get("$item");
				if ($item=~ /$regex/g){
					foreach my $stream (@tmp_streams){
					if ($stream =~ /EXT-X-TARGETDURATION/){
						my @temp =  split(/:/,$stream);
						$duration = $temp[1];
					}
					if($stream !~ /#/g){
						push(@streams,$stream);
						my $l = @streams;
						my $current_chunk = $streams[$l-1];
						if ($current_chunk ne $p_chunk){
							my $data  = get("$current_chunk");
							$p_chunk = $current_chunk;
							sleep(9);
						}
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					}
				}
			}
		}
	}
}
sub get_stream {
	my $uri = shift;
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	my $data = get("$uri");
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}
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##TCP impl. -PMM
sub handle_threads {
	$tcp_stop = 1;
	$thr->join();
}
sub end_xml{
		my $filename;
		my $twig = XML::Twig->new(pretty_print => 'indented');
		my ($date,$time)  = &get_date_time();
		$filename = $opt_xml;
		$filename = $date."_".$time.".xml" if $opt_xml eq "date_time";
    	open (MYFILE, '>'.$filename);
		my $final_xml = $doc->toString();
		$twig->parse($final_xml);
    	$twig->flush(\*MYFILE);
    	#print "</qstream> \n"  if $opt_xml eq "-";
		$doc->dispose;
		close (MYFILE);
		$xml_printed = 1;
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		&unit_test_2($filename) if $opt_test;
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}

sub tcp_packet_stats {
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	my $f = shift;
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	my $ip = shift;
	my ($tcp_obj) = shift;
	my $len,$ip_hlen = 0;
	#ipv6.pm uses different variables. 
	if($opt_ipv6){
		$len = plen;
	}
	else {
		$len = len;
		$ip_hlen = 20; 
	}
	#my $ip = NetPacket::IP->decode(eth_strip($pkt));
	#my $tcp_obj = NetPacket::TCP->decode(ip_strip(eth_strip($pkt)));
	#my $f = $ip->{src_ip}.":".$tcp_obj->{src_port} if !$offline;
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	my $seq_num = $tcp_obj->{seqnum};
	my $options = $tcp_obj->{options}; #12 bytes
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	#print "$tcp_obj->{src_port} \n";
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	if (!exists $tcp_packet_stats{$f}){
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		&init_stats($f);
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		$tcp_packet_stats{$f} = &share( {} );
		$seq_stats{$f} = &share( {} );
		$seq_stats_n{$f} = &share( {} );
		$tcp_packet_stats{$f}{'pkt_late'} = 0;
		$tcp_packet_stats{$f}{'pkt_retrans'} =0;
		$tcp_packet_stats{$f}{'pkt_dup'} = 0;
		
	}
	++$tcp_packet_stats{$f}{'num_packets'};
	&tcp_jitter_stats($f,$options);
	#Bandwidth messurements
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	$tcp_packet_stats{$f}{'num_bytes'} += $ip->{$len}; #counts the bytes
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	#Check for duplicated,out-of-order, late and lost packets.
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	$seq_stats{$f}{'seq_diff'} = $seq_num - $seq_stats{$f}{'p_seq_num'} - $seq_stats{$f}{'p_packet_len'};
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   	if ($seq_stats_n{$f}{'seq_num_p'} == $seq_num && $seq_stats{$f}{'p_seq_num'} != 0) {
   			++$tcp_packet_stats{$f}{'pkt_dup'};
   	}
   	if ($seq_stats{$f}{'seq_diff'} != 0 && $seq_stats{$f}{'p_seq_num'} != 0){
   		if ($seq_stats{$f}{'seq_diff'} < 0){
   			++$tcp_packet_stats{$f}{'pkt_late'};
   			if ($seq_stats_n{$f}{'seq_num_n'} == $seq_num){
   				++$tcp_packet_stats{$f}{'pkt_retrans'};
   			}
   		}
   		else {
   			++$tcp_packet_stats{$f}{'pkt_lost'};
    		}
   	}
   	if($seq_stats{$f}{'p_seq_num'} < $seq_num){
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   		$seq_stats{$f}{'n_seq_num'} = ($seq_num+$ip->{$len} -($ip_hlen)-($tcp_obj->{hlen}*4))
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   	} 
   	$seq_stats{$f}{'p_seq_num'} = $seq_num;
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   	$seq_stats{$f}{'p_packet_len'} = $ip->{$len}-($ip_hlen)-($tcp_obj->{hlen}*4);
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	$seq_stats_n{$f}{'seq_num_p'} = $seq_num;
	$seq_stats_n{$f}{'seq_num_n'} = $seq_stats{$f}{'n_seq_num'};
}
sub tcp_jitter_stats {
		my $f = shift;
		my $options = shift;
   		my $tcp_time_stamp_echo = unpack("N",substr($options,8,4));#from our client
   		my $tcp_time_stamp_delta = $tcp_time_stamp - $seq_stats{$f}{'p_tcp_time_stamp'};
   		my $tcp_time_stamp_echo_delta = $tcp_time_stamp_echo - $seq_stats{$f}{'p_tcp_time_stamp_echo'}; 
   		$seq_stats{$f}{'p_tcp_time_stamp'} = $tcp_time_stamp;
   		$seq_stats{$f}{'p_tcp_time_stamp_echo'} = $tcp_time_stamp_echo;
   		my $real_time_delta = time() - $seq_stats{$f}{'real_last_time'};
		$seq_stats{$f}{'real_last_time'} = time();
		
		#After AV streams starts
		#$first_av_packet = &get_stream_start() if $opt_rtmp;
		#$first_av_packet = $tcp_packet_stats{'num_packets'} if !$opt_rtmp and $opt_tcp;
		
		if ($tcp_packet_stats{$f}{'num_packets'} > 1){
			#gaps
			$tcp_packet_stats{$f}{'gap_sum'} += $real_time_delta;
			$tcp_packet_stats{$f}{'gap_square'} +=$real_time_delta**2;
			if ($tcp_packet_stats{$f}{'gap_max'} < $real_time_delta){
				$tcp_packet_stats{$f}{'gap_max'} = (10**3)*$real_time_delta;
			}
			if ($tcp_packet_stats{$f}{'gap_min'} > $real_time_delta){
				$tcp_packet_stats{$f}{'gap_min'} = (10**3)*$real_time_delta;
			}
			my $jitter  = abs($tcp_time_stamp_delta - $real_time_delta*10**3);
			if($jitter  > $tcp_packet_stats{$f}{'jitter_max'} ){
				$tcp_packet_stats{$f}{'jitter_max'}  = $jitter; 
			}
			if($jitter  < $tcp_packet_stats{$f}{'jitter_min'} ){
				$tcp_packet_stats{$f}{'jitter_min'}  = $jitter;
			}
			$tcp_packet_stats{$f}{'jitter_sum'} += $jitter;
			$tcp_packet_stats{$f}{'jitter_square'} += $jitter**2;
		}
		else {
			$tcp_packet_stats{$f}{'jitter_min'} = 2**31;
			$tcp_packet_stats{$f}{'jitter_max'} =  0;
			$tcp_packet_stats{$f}{'gap_max'} =  0;
			$tcp_packet_stats{$f}{'gap_min'} = 2*31;
		}
}
sub check_period {
	my $f =  shift;
	if((($opt_last)+$start_time) < time() || (($opt_period)+$start_time) < time()){
			$tcp_stop=1;
			my $span = time() - $start_time;
			&do_math($f,$span);
	}
}
sub eat_tcp {
	my $ip;
	my $port;
	if (!$opt_rtmp) {
		$uri = shift;
		$port = shift;
		if ($ip  !~ /^\d+\.\d+\.\d+\.\d+$/){
			($ip,$port) =  prepare_ip($uri);
		}
		my $f = $ip.":".$port;
		if (! exists($tstart{$f})){
		$tstart{$f} = [gettimeofday]; 
		$first_us{$f}=$prev1s_us{$f}=$prevt100ms_us{$f}=$us;
		if (! exists($setuptime{$f}) ){
		    if ( $pinterval){
			$setuptime{$f}=0;
		    } else {
			$setuptime{$f}=tv_interval ( $tjoined{$f}, $tstart{$f}) * 10**3;
		    }
		    printf "setup $f : %.3f\n",  $setuptime{$f} if $opt_debug;
		}
		}
	}
	$ip = $rtmp_addr if $opt_rtmp;
	$port = 1935 unless $port;
	my ($net, $netmask, $filter_t, $err, $dev);
	#my $time_out_ms = ($opt_last*10**3) || ($opt_period*10**3) if !$opt_last;
	my $time_out_ms = 2000;
	my $filter_str = "( (src $ip and port $port ) )";
	$dev = Net::Pcap::lookupdev(\$err);  # find a device	
	my $r = Net::Pcap::lookupnet( $dev, \$net, \$netmask, \$err);
	my $pcap = Net::Pcap::open_live($dev, 1514, 1, $time_out_ms, \$err) || die "You need to run this as sudo $err";
	$r=Net::Pcap::compile($pcap, \$filter_t, $filter_str, 0,$netmask);
	$r=Net::Pcap::setfilter($pcap, $filter_t);
	while (my $pkt=Net::Pcap::next($pcap,\%hdr)) { # get all packets
			
			my $ip_obj = NetPacket::IP->decode(eth_strip($pkt));
			my $tcp_obj = NetPacket::TCP->decode(ip_strip(eth_strip($pkt)));
			if($tcp_obj->{src_port} == $port && $ip_obj->{src_ip} eq $ip ){
			my $f = $ip_obj->{src_ip}.":".$tcp_obj->{src_port};
			check_period($f) if $opt_last;
			last if $tcp_stop==1;
			&tcp_packet_stats($pkt);
			}
	}
}
##RTMP impl. -PMM
sub rtmp_eat_stream {
	($rtmp,$period,$last,$reconnect,$debug,$swfurl,$pageurl,$flash_version) = @_;
	($address, $app, $play) = rtmp_prepare_url($rtmp);
	$rtmp_addr = $address;
	$port = 1935 unless $opt_port;
	my $f = $address.":".$port;
	while(!$endstream){
		$start_time = time();
		if (! exists($tstart{$f})){
		$tstart{$f} = [gettimeofday]; 
		$first_us{$f}=$prev1s_us{$f}=$prevt100ms_us{$f}=$us;
		if (! exists($setuptime{$f}) ){
		    if ( $pinterval){
			$setuptime{$f}=0;
		    } else {
			$setuptime{$f}=tv_interval ( $tjoined{$f}, $tstart{$f}) * 10**3;
		    }
		    printf "setup $f : %.3f\n",  $setuptime{$f} if $opt_debug;
		}
	 }
		$thr = threads->new(\&eat_tcp) if $opt_tcp and !$reconnect;
		rtmp_connect($address, '1935', $app , $swfurl, $pageurl,$flash_version) if $opt_rtmp;
		rtmp_play($play, '-1.0', '-1.0', $period, $last,$debug)  if $opt_rtmp;
		&display_stats() if ($opt_period != $opt_last) and !$endstream;
		my $pkt_stat = $thr->join if $opt_tcp;
		last if  $endstream;
		
	}
}
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sub rtmp_prepare_url{
	my $uri = shift;
	#	return 0  if $uri != m/^(rtmp)://; 
	$uri =~ s/^(rtmp)://;
	$uri =~ s#//##;
	@string = split(/\//, $uri);
	my $length = $#string;
	my $host = $string[0];
	my $app = '';
	if ($host !~ /^\d+\.\d+\.\d+\.\d+$/){ # hostname
		my $padr=gethostbyname($host) || die "Gethostbyname - $host - $padr : $!";
		$address=Socket::inet_ntoa($padr);
    }    
	for (my $i = 1; $i < $length;$i++){
		$app .= $string[$i];
		if ($i > 1 ){$app .="/";}
	}
	my $play = $string[$length];
	return ($address,$app,$play)
}
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#------------------------------------------------------------------------------

# unpack uri's to ip-address
sub prepare_ip {
    my $uri=shift;
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    $uri =~ s/^(udp|rtp|http)://;
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    $uri =~ s#//##;
    die "Unsupported streaming $1" if $uri =~/^(\w:)/;
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    if ($multicast = ($uri =~ /@/)){
	($source, $uri)=split(/@/, $uri);
    }
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    my ($host, $port)=split(/[\/:]/, $uri);
    die $usage . "undefined address inn $host" unless (defined $host);
    $port = $DEFAULT_PORT unless (defined $port);
    my $address=$host;
    if ($host !~ /^\d+\.\d+\.\d+\.\d+$/){ # hostname
	my $padr=gethostbyname($host) || die "Gethostbyname - $host - $padr : $!";
	$address=Socket::inet_ntoa($padr);
    }   
    my @nib=split(/\./,$address);
    $multicast = $multicast || $nib[0] >= 224 && $nib[0] <= 240;
    return ($address, $port, $multicast);

}

sub eat_stream {
    my $id=shift;
    $tstart{$id}=[gettimeofday];
    if ($opt_net && $opt_rtp){
	# Create RTP socket
	my $elapsed=0;
	my $t0=0.0;
	$n_packets=0;
	my ($address, $port, $multicast) = prepare_ip($id);
	my $rtp = new Net::RTP( LocalPort=>$port,
				LocalAddr=>$address ) || die "Failed to create RTP socket: $!";
	my $select=IO::Select->new($rtp->fileno);

	my $tjoined=[gettimeofday];
	if ($opt_align){ # align to $opt_period
	}

	while ($uninterrupted && !($opt_packets && $n_packets > $opt_packets)) {
	    my $packet;
	    last if ! $uninterrupted || $endstream;
	    if ($select->can_read($timeout) && ($packet = $rtp->recv())){
		my $ssrc = $packet->ssrc();
		$cur_id=$packet->source_ip . ", $address:$port";

		if ( !$file{$cur_id}){
		    push(@myflows, $cur_id);
		    $file{$cur_id}=$id;
		}
		$n_packets++;
		next if $opt_src and $opt_src ne $cur_id;

		$tc=[gettimeofday]; # current flow time
		if( $t0){
		    $elapsed=tv_interval ( $t0, $tc);
		} else {
		    $t0 = $tc;
		    $elapsed=0.0;
		    &init_stats($cur_id);
		}
		$us=$elapsed*10**6;
		$tjoined{$cur_id} = $tjoined if !$tjoined{$cur_id};
		# No stats for that SSRC yet?
		&pkt_stats($cur_id, $packet->encode, $elapsed * 10**6, $packet->size());
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		if ($opt_dump){
		    print DUMP $packet;
		}
	    } else { # anticipate interrupted by alarm	
#		warn "Failed to receive $n_packets packets from $address:$port : $!";
#		next; #### exit
	    }
	}
#	&display_stats();

#	$mc->shutdown; # gives error message

    } elsif ($opt_net) {			# udp stream

	# Create UDP socket
	my $elapsed=0;
	my $t0=0.0;
        $n_packets=0;
	my ($address, $port, $multicast) = prepare_ip($id);
	my $mc;

	if ( $multicast){
	    $mc = IO::Socket::Multicast->new(LocalPort=>$port, LocalAddr=>$address, ReuseAddr=>1) ||
		die "Could not connect to port $port : $!";
	    $mc->mcast_add($address) || die "could not join $address:$port : $!";
	} else { # unicast
	    $mc = IO::Socket::INET->new( LocalAddr=> $address, LocalPort => $port);
	}
	my $tjoined=[gettimeofday];

	my $select=IO::Select->new($mc->fileno);

	if ($opt_align){ # align to $opt_period
	}

	while ($uninterrupted && ! $endstream && !($opt_packets && $n_packets > $opt_packets)){
	    
	    if ($select->can_read($timeout) && $mc->recv($packet, 1560)) {
		last if ! $uninterrupted || $endstream;
		$n_packets++;
		my $ssrc = $mc->peerhost;
		my $cur_id = $mc->peerhost . ":" . $mc->peerport  . "->$address:$port";
		if ( !$file{$cur_id}){
		    push(@myflows, $cur_id);
		    $file{$cur_id}=$id;
		}
		
		next if $opt_src and $opt_src ne $cur_id;

		$tc=[gettimeofday]; # current flow time
		if( $t0){
		    $elapsed=tv_interval ( $t0, $tc);
		} else {
		    $t0 = $tc;
		    $elapsed=0.0;
		    &init_stats($cur_id);
		}
		$us=$elapsed*10**6;
		
		$tjoined{$cur_id} = $tjoined if !$tjoined{$cur_id};
		# No stats for that SSRC yet?
		&pkt_stats($cur_id, $packet, $elapsed * 10**6, length($packet));
		if ($opt_dump){
		    print DUMP $packet;
		}
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		$endstream = tv_interval($t0, $tc) >= $opt_last if $opt_last && !$endstream;
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	    } else { # assume that we got an interrupt
#		die "Failed to receive packet: $!"; 
	    }
	}
#	&display_stats();
#        $mc->mcast_drop($address);

    } else {			# files
	my $f=$id;
	my $pcap; 
	my $tmp_file;

	my $pcap_file=$f;
	if ($f =~ /\.gz$|\.Z/){ # gzipped ?
	    $tmp_file="/tmp/pcap$$";
	    $pcap_file=$tmp_file;
	    system( "/bin/zcat $f > $tmp_file") ; # rc code ? || die "Could not unpack $f to $tmp_file : $!";
	}
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	if ($opt_crude){
	    my $flow_key;
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	    open CRUDE, "<$pcap_file" || die "Could not open $f : $err";
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	    while(<CRUDE>){  # crude.sourceforge.net
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		my $tx0;
		
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		if (($fid, $seq, $src, $dst, $tx, $rx, $size)=
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			 /ID=(\d+)\s+SEQ=(\d+)\s+SRC=([\d.:]+)\s+DST=([\d.:]+)\s+Tx=([\d.,]+)\s+Rx=([\d.,]+)\s+SIZE=(\d+)/){
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		    $flow_key="$src->$dst";
		    $flow_pkts{$flow_key}++;
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		    $tc=[int($rx), ($tx-int($rx))*10^6] ; # tval
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		    if ($flow_pkts{$flow_key} <= 1) { # new flow
			push(@flows, $flow_key);  # 
			$flow_no++; 
			$file{$flow_key}=$f;
			$source{$flow_key}=$src;
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			$rx0{$flow_key}=$rx;
			$tx0{$flow_key}=$tx;
			$tjoined{$flow_key}=$tc;
		    } 
		    
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		    next if $opt_list;  # just count packets per flow
		    next if $opt_flow_key && $flow_key !~ $wanted_flow;
		    next if $opt_flow_no && $opt_flow_no !~ /\b$flow_no\b/;
		    
		    if ($flow_pkts{$flow_key} <= 1) { #
			&init_stats($flow_key);
			push (@myflows, $flow_key);
		    }

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		    $seq_num{$flow_key}=$seq;
		    $ptx{$flow_key}=$tx{$flow_key}; # previous
		    $tx{$flow_key}=$tx;
		    $rx{$flow_key}=$rx;
		    $mtime{$flow_key}=($tx-$tx0{$flow_key})*10**6;
		    $us=($rx-$rx0{$flow_key})*10**6; # us
		    &pkt_stats($flow_key, 0, $us, $size);
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		}
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	    }
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	} else {
	    if ($pcap=Net::Pcap::open_offline($pcap_file, \$err)){ 
		#	my $select=IO::Select->new(Net::Pcap::fileno($pcap));
		until ( ! $uninterrupted || $endstream || ($opt_packets && $n_packets > $opt_packets) 
			|| ! (my $pkt=Net::Pcap::next($pcap, \%hdr) ) ) {
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			#$file_flag =1;
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			$offline =1;
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		    eat_pcap($f, $pcap, $pkt);
		    $n_packets++;
		}
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		printf "%s\n", $ttl_log if  $opt_ttl;

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	    } else { # open failed 
		if ($format ne "full"){ # always put out data when format full
		    die "Could not open $f : $err";
		}
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	    }
	}
	undef $t0;
	unlink $tmpfile if $tmp_file;
    } # of files
} # of eat_stream


sub eat_pcap_streams{ # open groups and listen on pcap
    my @streams=@_; 
    my $filter="( ";
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    my ($address, $port, $multicast);
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    my $mc = IO::Socket::Multicast->new(LocalPort=>$DEFAULT_PORT, ReuseAddr=>1) ||
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	die "Could not connect to port $port : $!";
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    foreach $id (@streams){ # listen to all groups
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	if ($opt_ipv6){
		$address = Net::IPv6Addr::ipv6_parse($id);
		$port =  $opt_p;
	}
	else {
		($address, $port, $multicast) = prepare_ip($id);
	}
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	$filter .= " or " if $filter =~ /\(\s+\(/;
	if ($multicast){
	    $mc->mcast_add($address) || die "could not join $address:$port : $!";
	    $filter .= "(dst $address and port $port)"; 	
	} else {
	    $filter .= "(src $address and port $port)"; 
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	}
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    }
    $tjoined{$f}=[gettimeofday];
    $filter .= " )";
#    $filter .= " and ip multicast";
#    $filter ="ip";
    my ($net, $netmask, $filter_t, $err, $dev);
#    printf $filter;
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    $dev = Net::Pcap::lookupdev(\$err) || die "Could not lookupdev $dev : $err : $! .. Needs to run as sudo ..";
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    my $r = Net::Pcap::lookupnet( $dev, \$net, \$netmask, \$err);
    die "Failed lookupnet for $dev : $r : $err : $!" if $r != 0;
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    my $snap_length = 100;
    $snap_length = 1514 if $opt_mpeg;
    $pcap=Net::Pcap::open_live( $dev, $snap_length, 1, 0,\$err) || die "Could not open $dev  : $err";
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    $r=Net::Pcap::compile($pcap, \$filter_t, $filter, 0, $netmask);
    die "Could not compile filter : $r : $filter : $!)" if $r != 0;
    $r=Net::Pcap::setfilter($pcap, $filter_t);
    die "Could not set pcap filter : $r : $filter : $! " if $r != 0 ;
    my $select=IO::Select->new( Net::Pcap::fileno($pcap));
    while ($select->can_read($timeout) && (my $pkt=Net::Pcap::next($pcap, \%hdr)) ) { # get all packets
	last if ! $uninterrupted || $endstream;
	eat_pcap("pcap", $pcap, $pkt);
	$n_packets++;
	last if  $opt_packets && $n_packets > $opt_packets;
    }
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    printf "%s\n", $ttl_log if  $opt_ttl;

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}

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sub set_network_info{
	my ($f,$src_ip,$dst_ip,$src_port,$dst_port) = @_;
	$network_info{$f}{'src_ip'} = $src_ip;
	$network_info{$f}{'dst_ip'} = $dst_ip;
	$network_info{$f}{'src_port'} = $src_port;
	$network_info{$f}{'dst_port'} = $dst_port;	
}
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sub eat_pcap { # process pcap packets	
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    my ($f, $pcap, $pkt)=@_;
    my $ip=null;
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    my $ip_payload;# udp or tcp packet.
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    my $rtp = new Net::RTP::Packet(); # spare rtp obj
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    my $proto,$len=null;
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    if (Net::Pcap::datalink($pcap) == 1){ # ethernet
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    	if ($opt_ipv6){
	  		$ip = NetPacket::IPv6->decode(eth_strip($pkt));
      		$proto = $ip->{nxt};
      		$len = plen;
      		$hlen =  0;
		}
		else {
			$ip = NetPacket::IP->decode(eth_strip($pkt));
			$proto = $ip->{proto};
			$len = len;
			$hlen = ($ip->{hlen}*4);
		}
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    } elsif (Net::Pcap::datalink($pcap) == 113) { # DLT_LINUX_SLL
	my ($head, $data)=unpack('a16a*', $pkt);  
	$ip = NetPacket::IP->decode($data);
    } else {
	die "Invalid link layer type : ".Net::Pcap::datalink($pcap);
    }
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    if ($proto == IP_PROTO_TCP){
    	$opt_tcp = 1; 
		$ip_payload = NetPacket::TCP->decode($ip->{data});
    }
    else {
    	$ip_payload = NetPacket::UDP->decode($ip->{data});
    }
    my $dlen = $ip->{$len} - $hlen;
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    my $flow_key;
    if ($opt_sum){
	$flow_key=$opt_sum;
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    }
    elsif ($file_flag){
    	$flow_key = $f;
    }
    else {
		$flow_key=sprintf "%s:%d->%s:%d", 
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        $ip->{src_ip}, $ip_payload->{src_port}, $ip->{dest_ip}, $ip_payload->{dest_port};
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    }
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    set_network_info($f,$ip->{src_ip}, $ip_payload->{src_port}, $ip->{dest_ip}, $ip_payload->{dest_port});
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    $flow_pkts{$flow_key}++;
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    #next if $ip->{proto} != IP_PROTO_UDP;
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    if ($flow_pkts{$flow_key} <= 1) { # new flow
	push(@flows, $flow_key);  # 
	$flow_no++; 
	$file{$flow_key}=$f;
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	$source{$flow_key} =sprintf "%s:%d", $ip->{src_ip}, $ip_payload->{src_port};
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    }
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    if ($opt_ttl){
	if ($pttl{$flow_key} && ($opt_log ||  ($pttl{$flow_key} !=  $ip->{ttl}))){ # change in ttl
	    printf "%s\n",  $ttl_log;
	    $nttl{$flow_key}=0;		
	}
	$pttl{$flow_key}= $ip->{ttl};
	$nttl{$flow_key}++;
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	($sequence_number{$flow_key}, $tx_time_seconds{$flow_key}, $tx_time_useconds{$flow_key}, $flow_id{$flow_key})= unpack('NNNN', $ip_payload->{data});
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	$ttl_log=sprintf "ID=%u SEQ=%u SRC=%s DST=%s Tx=%u.%06u  Rx=%u.%06u TTL=%u",  
	$flow_id{$flow_key}, $sequence_number{$flow_key}, 
	$ip->{src_ip}, $ip->{dest_ip}, $tx_time_seconds{$flow_key}, 
	$tx_time_useconds{$flow_key}, $hdr{tv_sec}, $hdr{tv_usec}, $pttl{$flow_key};
	$ttl_log.= sprintf(" No=%08d\n",  $nttl{$flow_key},) if !$opt_log;
    }
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    next if $opt_list;  # just count packets per flow
    next if $opt_flow_key && $flow_key !~ $wanted_flow;
    next if $opt_flow_no && $opt_flow_no !~ /\b$flow_no\b/;

    if ($flow_pkts{$flow_key} <= 1) { #
	&init_stats($flow_key);
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		push (@myflows, $flow_key);
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    }
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    $tc= [$hdr{tv_sec}, $hdr{tv_usec}];
    if (! defined($t0)) {
	$t0=$tc;
    }
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    $tjoined{$f}=$tc if !$tjoined{$f};
    $tjoined{$flow_key} = $tjoined{$f} if !exists($tjoined{$flow_key});
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    $us = tv_interval ( $t0, $tc) * 10**6 ; # us relative packet time 	  
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# fixate on first flow to appear
#    if ( $first_port) {
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#	next if $ip_payload->{dest_port} != $first_port;
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#    } else {
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#	$first_port =  $ip_payload->{dest_port};
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#    }
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	if ($opt_tcp){
		&tcp_packet_stats($flow_key,$ip,$ip_payload);
	}
    &pkt_stats($flow_key, $ip_payload->{data}, $us, $dlen);
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}
sub init_stats {
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    my $f=shift;
    $pinterval=0;
    $npkt{$f}=$sumbyte{$f}=$ssbyte{$f}=0;
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    $first_sec=0;
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    delete $pmtime{$f}; delete $pus{$f} ; delete $first_us{$f};  delete $last_us{$f}; 
    delete $prev_1s{$f}; delete $prev_100ms{$f};
    delete $per1s{$f}; delete $per100ms{$f};
    delete $sum1s{$f}; delete $sum100ms{$f};
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    $n100ms{$f}=0; $sum100ms{$f}=0; $ss100bps{$f}=0; $akk100ms{$f}=0;
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    $sumbyte{$f}=$sumps{$f}=0;			# sum byte per second
    $maxbps{$f}=0; $max100ms{$f}=0;
    $dup{$f}=$lost{$f}=$late{$f}=0;
    $maxbyte{$f}=0; $minbyte{$f}=2**31;
    $sumgap{$f}=$ssgap{$f}=0;
    $ngap{$f}=0; $maxgap{$f}=0, $mingap{$f}=2**63-5;
    $njitter{$f}=$sumjitter{$f}=$ssjitter{$f}=0;
    $maxjitter{$f}=-2**63-5; $minjitter{$f}=2**63-5; delete $est_jitter{$f}; delete $pest_jitter{$f}; 
    $first_port = 0;  $n_seq=-1;
    delete $tstart{$f}; delete $tend{$f}; 
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#MPEG-TS initalizing and resetting (new period!)
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    $discontinuities = 0;
    %last_ccs = ();
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    %mpeg_stats = ();
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    @cc = ();
# r_stats {filename/handle}
    @pcr_stats{$f} = ();
#P-stats {filename/handle}
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    @pts_stats{$f,$TS} = ();
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    @mpeg_stats{$f} = ();
#P stuff
    $late_video_packets = 0;
#MPEG-TS END
    %dist1 = ();
    %dist2 = ();
    $num_cc = 0;
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}
sub format_numbers{
	my $value =  shift;
	if ($value =~ /^[a-zA-z][\D]*$/ || $value  !~ /^\d+\.\d+$/) {
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		return sprintf("%1.0f",$value);
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	}
	else {
		return sprintf("%0.5f",$value);
	}
}
sub xml_dump_rtmp_tcp {
	my $f = shift;
	return 0 if $xml_printed;
	my ($rtmp_jitter_stats,$rtmp_stats,$span)  = get_rtmp_data() if $opt_rtmp;
	my ($tcp_packet_stats) = (\%tcp_packet_stats) if $opt_tcp;
	my $xml_version="1.0";
    if ($period_num <= 1 ){
		$doc = XML::DOM::Document->new;
    	my $decl = $doc->createXMLDecl('1.0');
   		$doc-> setXMLDecl($decl);
   		$qstream = $doc->createElement('qstream');
   		$qstream->setAttribute('version',$xml_version);
   		$doc->appendChild($qstream);
    }
	($address,$app,$play) = rtmp_prepare_url($f) if $rtmp;
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	#($address, $port) = prepare_ip($f) if $opt_tcp && !$opt_rtmp;
	#$port  = 1935 unless $opt_port;
	#my $id=$address.":".$port;
	my $id = $f;
	my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($tstart{$f}->[0]);
	my $time=sprintf "%02d:%02d:%02d", $hour, $min, $sec;
	my $date=sprintf "%4d-%02d-%02d", $year+1900, $mon+1, $mday;
	my $span=&tv_interval($tstart{$f}, $tend{$f}); # second
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	&do_math($id,$span);
    my $flow = $doc->createElement('flow');
	my $flow_id = $doc->createElement('flow_id');
	my $rtmp_stats_xml  = $doc->createElement('rtmp_stats');
	my $dateXML = $doc->createElement('date');
    my $timeXML = $doc->createElement('time');
    my $spanXML = $doc->createElement('span'); 
    $qstream->appendChild($flow);
    $flow->appendChild($flow_id);
    $flow->appendChild($dateXML);
    $flow->appendChild($timeXML);
    $flow->appendChild($rtmp_stats_xml) if $opt_rtmp;
    $rtmp_stats_xml->appendChild($spanXML);    

	#source and destination ip. 
	$flow_id->addText($id);
	
	#datetime 
	$dateXML->addText($date);
	$timeXML->addText($time);
	$spanXML->addText($span);

	if ($opt_rtmp) {
		for my $k1 ( sort keys %$rtmp_stats ) {
	        my $element = $doc->createElement($k1);	
	        $rtmp_stats_xml->appendChild($element);
	        $element->addText(&format_numbers($rtmp_stats->{ $k1 }));	
	    }
	    foreach $k1 (sort keys %$rtmp_jitter_stats ){
	    	if ($rtmp_jitter_stats->{ $k1 }{ 'type' } eq "Video" || $rtmp_jitter_stats->{ $k1 }{ 'type'} eq "Audio" ){
		    	my $chunk = $doc->createElement('chunk');
		        $chunk->setAttribute('id', $k1);
		        $rtmp_stats_xml->appendChild($chunk);
		       	for my $k2 (sort keys %{$rtmp_jitter_stats->{ $k1 }} ) {
		        		my $element = $doc->createElement($k2);
		        		$chunk->appendChild($element);
		        		$value = &format_numbers($rtmp_jitter_stats->{ $k1 }{ $k2 }); 
		        		$element->addText(&format_numbers($value));
		       	}   
	    	}     
	    }
	}
    #bandwidth	
    if ($opt_tcp){
    	$f = $id;
    	my $bw_stats = $doc->createElement('bandwidth_stats');
   		my $avg_bw = $doc->createElement('avg_bandwidth');
    	my $max_bw = $doc->createElement('max_bandwidth_1s');
   		my $max_bw_100ms = $doc->createElement('max_bandwidth_100ms');
    	my $sdv_bw = $doc->createElement('bandwidth_sdv');
    	$flow->appendChild($bw_stats);
    	$bw_stats->appendChild($avg_bw);
    	$bw_stats->appendChild($max_bw);
    	$bw_stats->appendChild($max_bw_100ms);
    	$bw_stats->appendChild($sdv_bw);
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    	$avg_bw->addText(&format_numbers( avg( $bw_stats{$f}{'sumbyte'}*8, $span )));
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		$max_bw->addText(&format_numbers($bw_stats{$f}{'maxbps'}));
		$max_bw_100ms->addText(&format_numbers($bw_stats{$f}{'max100ms'}));
		$sdv_bw->addText(&format_numbers(sdv($bw_stats{$f}{'n100ms'},
		$bw_stats{$f}{'akk100ms'}, 
		$bw_stats{$f}{'ss100bps'})));
    	my $child = $doc->createElement('tcp_packet_stats');
    	$flow->appendChild($child);
    		for my $k2 (sort keys %{$tcp_packet_stats->{ $id }} ) {
        		my $grandchild = $doc->createElement($k2);
        		$value = &format_numbers($tcp_packet_stats->{$id}{$k2});
        		$grandchild->addText($value);	
       			$child->appendChild($grandchild);
    		}
     } 
    #my $final_xml = $flow->toString();
    &init_stats($id);
}

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sub xml_new {
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	my ($pcr_stats,$pts_stats,$mpeg_stats) = (\%pcr_stats, \%pts_stats,\%mpeg_stats) if $opt_mpeg;
	my $doc = XML::DOM::Document->new;
    my $decl = $doc->createXMLDecl('1.0');
    my $flow = $doc->createElement('flow');
    my $src_dst = $doc->createElement('src_dst');
    my $dateXML = $doc->createElement('date');
    my $timeXML = $doc->createElement('time');
    my @elements_network_stats  = qw "src_dst date time network_stats setuptime gap";
    my @elements_pcr  = qw "pcr_avg_jitter pcr_sdv_jitter pcr_jitter_min pcr_jitter_max";
    my @elements_pts  = qw "dwell_sum dwell_num";
    my @elements_rtp = qw " ";
	my $mpeg_stats_parrent = $doc->createElement('mpeg_stats');
    my $pcr_stats_parrent = $doc->createElement('pcr_stats');
    my $transport_streams = $doc->createElement('transport_streams');
    my $pts_stats_parrent = $doc->createElement('pts_stats');

	#append static childs
    $doc->appendChild($flow);
    $flow->appendChild($pcr_stats_parrent);
    $flow->appendChild($transport_streams);
   	$transport_streams->appendChild($pts_stats_parrent);
   	$transport_streams->appendChild($mpeg_stats_parrent);
   	
   	#loop through hashes
   	for my $k1 ( sort keys %mpeg_stats ) {
    	for my $k2 ( keys %{$mpeg_stats->{ $k1 }} ) {
    		for my $k3 (keys %{$mpeg_stats->{ $k1 } { $k2 }}){
    					#$child = $doc->createElement($k3);
    					#$child->addText(&lesbar($mpeg_stats->{ $k1 }{ $k2 }{ $k3 }));
    					#$mpeg_stats_parrent->appendChild($child);		
    		}
    	}
   	}
    
    for my $k1 ( sort keys %$pcr_stats ) {
    	for my $k2 ( keys %{$pcr_stats->{ $k1 }} ) {
    		foreach my $element (@elements_pcr){
    			if ($element eq $k2){
    				$child = $doc->createElement($k2);
    				$child->addText(&lesbar($pcr_stats->{ $k1 }{ $k2 }));
    				$pcr_stats_parrent->appendChild($child);		
    			}
    		}
      	}
  	}
  	
    for my $k1 ( sort keys %$pts_stats ) {
    	for my $k2 ( keys %{$pts_stats->{ $k1 }} ) {
    		for my $k3 (keys %{$pts_stats->{ $k1 } { $k2 }}){
    			foreach my $element (@elements_pts){
    				if ($element eq $k3){
    					$child = $doc->createElement($k3);
    					$child->addText(&lesbar($pts_stats->{ $k1 }{ $k2 }{ $k3 }));
    					$pcr_stats_parrent->appendChild($child);		
    				}	
    			}
    		}
      	}
  	}
}


sub xml_dump {
	my $f = shift;
	return 0 if $xml_printed;
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	my ($network_info) = (\%network_info);
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	my ($pcr_stats,$pts_stats) = (\%pcr_stats, \%pts_stats) if $opt_mpeg;
	my $xml_version="1.0";
    if ($period_num <= 1 ){
		$doc = XML::DOM::Document->new;
    	my $decl = $doc->createXMLDecl('1.0');
   		$doc-> setXMLDecl($decl);
   		$qstream = $doc->createElement('qstream');
   		$qstream->setAttribute('version',$xml_version);
   		$doc->appendChild($qstream);
    }
	my $flow = $doc->createElement('flow');
	my $flow_id = $doc->createElement('flow_id');
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	my $flow_nameXML = $doc->createElement('flow_name');
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	my $dateXML = $doc->createElement('date');
    my $timeXML = $doc->createElement('time');
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    my $spanXML = $doc->createElement('span');
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    my $pcr_jitter_parrent = $doc->createElement('pcr_jitter') if $opt_mpeg;
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    my $network_info_parrent = $doc->createElement('network_info');
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    $qstream->appendChild($flow);
    $flow->appendChild($flow_id);
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    $flow->appendChild($flow_nameXML);
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    $flow->appendChild($dateXML);
    $flow->appendChild($timeXML);
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    $flow->appendChild($spanXML);
    $flow->appendChild($network_info_parrent);
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    $flow->appendChild($pcr_jitter_parrent) if $opt_mpeg;
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    my $media="file";
    $media = "host:port" if $opt_net;
	my $id=$f;
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	$flow_name = $id;
	$id = $opt_id if $opt_id;
	$flow_name = $opt_name if $opt_name;
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	next if $npkt{$f} < $opt_flow_min;
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	my $source=$f; 
	$source=$source{$f} if  ! $opt_v && $source{$f} ne "";
	$source=$opt_id if $opt_id;
	my $jitter_stat= $opt_rtp || $opt_crude;
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	my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($tstart{$f}->[0]);
	my $time=sprintf "%02d:%02d:%02d", $hour, $min, $sec;
	if ($format eq "full"){
	    $time.=sprintf ".%06d", $tstart{$f}->[1];
	} else {
	    my $time=sprintf "%02d:%02d:%02d", $hour, $min, $sec;
	}
	my $date=sprintf "%4d-%02d-%02d", $year+1900, $mon+1, $mday;
	my $span=&tv_interval($tstart{$f}, $tend{$f}); # second
	&do_math($f,$span);
	&burst($f); # in case a second is interrupted
	#source and destination ip. 
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	$flow_id->addText($id);
	$flow_nameXML->addText($flow_name);
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	#datetime 
	$dateXML->addText($date);
	$timeXML->addText($time);
	$spanXML->addText($span);
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	for my $k1 ( sort keys %network_info ) {
    	for my $k2 ( keys %{$network_info->{ $k1 }} ) {
    		$child = $doc->createElement($k2);
    		$child->addText($network_info->{ $k1 }{ $k2 });
    		$network_info_parrent->appendChild($child);
    	}
   	}
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    #network_stats
    my $network_stats = $doc->createElement('network_stats');
    my $setuptimeXML = $doc->createElement('setuptime');
    my $gap_avgXML = $doc->createElement('gap_avg');
    my $gap_sdvXML = $doc->createElement('gap_sdv');
    my $min_gapXML = $doc->createElement('min_gap');
    my $max_gapXML = $doc->createElement('max_gap');
    $network_stats->appendChild($setuptimeXML);
    $network_stats->appendChild($gap_avgXML);
    $network_stats->appendChild($gap_sdvXML);
    $network_stats->appendChild($min_gapXML);
    $network_stats->appendChild($max_gapXML); 
    $flow->appendChild($network_stats);
    #packets_stats
    my $packet_stats = $doc->createElement('packet_stats');
    my $packets_numbXML = $doc->createElement('packet_count');
    my $packets_sizeXML = $doc->createElement('packets_size');
    $flow->appendChild($packet_stats);
    $packet_stats->appendChild($packets_numbXML);
    
    #bandwidth
    my $bw_stats = $doc->createElement('bandwidth_stats');
    my $avg_bw = $doc->createElement('avg_bandwidth');
    my $max_bw = $doc->createElement('max_bandwidth');
    my $max_bw_100ms = $doc->createElement('max_bandwidth_100ms');
    my $sdv_bw = $doc->createElement('bandwidth_sdv');
    $bw_stats->appendChild($avg_bw);
    $bw_stats->appendChild($max_bw);
    $bw_stats->appendChild($max_bw_100ms);
    $bw_stats->appendChild($sdv_bw);
    $flow->appendChild($bw_stats);

	#network_stats
	$setuptimeXML->addText(&format_numbers($setuptime{$f}));
	$gap_avgXML->addText(&format_numbers(avg( $sumgap{$f}, $ngap{$f}) / 1000 ));
	$gap_sdvXML->addText(&format_numbers(sdv($ngap{$f}, $sumgap{$f},$ssgap{$f})/1000));
	$min_gapXML->addText(&format_numbers($mingap{$f}/1000));
	$max_gapXML->addText(&format_numbers($mingap{$f}/1000));
	
	#Jitter / $opt_crue or $opt_rtp
	if ($jitter_stat){
	    #create elements
	    my $MOS_XML = $doc->createElement('MOS');
	    my $rtp_timestamp = $doc->createElement('rtp_timestamp');
	    my $rtp_dup = $doc->createElement('rtp_duplicated');
	    my $rtp_late = $doc->createElement('rtp_pkt_late');
	    my $rtp_lost = $doc->createElement('rtp_pkt_lost');
	    my $rtp_gaps = $doc->createElement('rtp_pkt_gaps');
	    my $rtp_avg = $doc->createElement('rtp_pkt_lost_avg');
	    my $rtp_sdv = $doc->createElement('rtp_pkt_lost_sdv');
	    my $rtp_jitter_numb = $doc->createElement('rtp_jitter_numb');
	    my $rtp_jitter_avgXML = $doc->createElement('rtp_jitter_avg');
	    my $rtp_jitter_sdvXML = $doc->createElement('rtp_jitter_sdv');
	    my $rtp_jitter_minXML = $doc->createElement('rtp_jitter_min');
	    my $rtp_jitter_maxXML = $doc->createElement('rtp_jitter_max');
	    my $rtp_jitter_rfc = $doc->createElement('rtp_jitter_rfc');
		my $packets_dupXML = $doc->createElement('packet_duplicated');
    	my $packets_lateXML = $doc->createElement('packet_late');
    	my $packets_lostXML = $doc->createElement('packet_lost');
	    my $packets_sizeXML = $doc->createElement('packet_size');
	    
	    #append childs
	    $network_stats->appendChild($MOS_XML);
	    $network_stats->appendChild($rtp_timestamp);
	    $network_stats->appendChild($rtp_dup);
	    $network_stats->appendChild($rtp_late);
	    $network_stats->appendChild($rtp_lost);
	    $network_stats->appendChild($rtp_gaps);
	    $network_stats->appendChild($rtp_avg);
	    $network_stats->appendChild($rtp_sdv);
	    $network_stats->appendChild($rtp_jitter_numb);
	    $network_stats->appendChild($rtp_jitter_avgXML);
	    $network_stats->appendChild($rtp_jitter_sdvXML);
	    $network_stats->appendChild($rtp_jitter_minXML);
	    $network_stats->appendChild($rtp_jitter_maxXML);
	    $network_stats->appendChild($rtp_jitter_rfc);
	  
	   	$packet_stats->appendChild($packets_dupXML);
    	$packet_stats->appendChild($packets_lateXML);
    	$packet_stats->appendChild($packets_lostXML);
    	$packet_stats->appendChild($packets_sizeXML);
    	
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    	$packets_dupXML->addText(&format_numbers($dup{$f}));
		$packets_lateXML->addText(&format_numbers($late{$f}));
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		$packets_lostXML->addText(&format_numbers($nloss{$f}));
		my $n=$npkt{$f}; $n=1 if $npkt{$f} <1; # divide by zero protection
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		$packets_sizeXML->addText(&format_numbers($sumbyte{$f}/$n));
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	    #adds values
	    $MOS_XML->addText(&format_numbers(&mos_r($codec, $rtt,  avg( $sumgap{$f}, $ngap{$f}) / 1000,
					avg($sumjitter{$f}, $njitter{$f})/1000, 
					100*$nloss{$f}/$npkt{$f})));	
	    $rtp_timestamp->addText(&format_numbers($ntimeerr{$f}));
	    $rtp_dup->addText(&format_numbers($dup{$f}));
	    $rtp_late->addText(&format_numbers($late{$f}));
	    $rtp_lost->addText(&format_numbers($lost{$f}));
	    $rtp_gaps->addText(&format_numbers($nloss{$f}));
	    $rtp_avg->addText(&format_numbers( avg( $sumloss{$f}, $nloss{$f}) ));
	    $rtp_sdv->addText(&format_numbers( sdv($lost{$f}, $sumloss{$f},$ssumloss{$f})));
	    $rtp_jitter_numb->addText(&format_numbers($njitter{$f}));			
	    $rtp_jitter_avgXML->addText(&format_numbers($sumjitter{$f}/$njitter{$f}/1000));
	    $rtp_jitter_sdvXML->addText(&format_numbers($sumjitter{$f}/$njitter{$f}/1000));
	    $rtp_jitter_minXML->addText(&format_numbers($minjitter{$f}/1000));
	    $rtp_jitter_maxXML->addText(&format_numbers($maxjitter{$f}/1000));
	    $rtp_jitter_rfc->addText(&format_numbers($maxjitter{$f}/1000));
	}	
	#packet stats
	
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	$packets_numbXML->addText(&format_numbers($npkt{$f}));
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	#$packets_sizeXML->addText();

	#bandwidth	
	$avg_bw->addText(&format_numbers( avg( $sumbyte{$f}*8, $span )));
	$max_bw->addText(&format_numbers($maxbps{$f}));
	$max_bw_100ms->addText(&format_numbers($max100ms{$f}));
	$sdv_bw->addText(&format_numbers(sdv($n100ms{$f},
			$akk100ms{$f}, 
			$ss100bps{$f})));	
	if ($opt_mpeg) {			
	#PCR_stats
	my $pcr_jitter_avg_XML = $doc->createElement('pcr_jitter_avg');
	my $pcr_jitter_sdv_XML = $doc->createElement('pcr_jitter_sdv');
	my $pcr_jitter_min_XML = $doc->createElement('pcr_jitter_min');
	my $pcr_jitter_max_XML = $doc->createElement('pcr_jitter_max');
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	$pcr_jitter_avg_XML->addText(&format_numbers( (10**3) * avg($pcr_stats{$f}{$pcr_pid{$f}}{'pcr_jitter_sum'}, $pcr_stats{$f}{$pcr_pid{$f}}{'num'})));
	$pcr_jitter_sdv_XML->addText(&format_numbers( (10**3) * sdv($pcr_stats{$f}{$pcr_pid{$f}}{'num'}, $pcr_stats{$f}{$pcr_pid{$f}}{'pcr_jitter_sum'},$pcr_stats{$f}{$pcr_pid{$f}}{'pcr_jitter_square'})));
	$pcr_jitter_min_XML->addText(&format_numbers( (10**3) * $pcr_stats{$f}{$pcr_pid{$f}}{'min_jit'}));
	$pcr_jitter_max_XML->addText(&format_numbers( (10**3) * $pcr_stats{$f}{$pcr_pid{$f}}{'max_jit'}));
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		$pcr_jitter_parrent->appendChild($pcr_jitter_avg_XML);
		$pcr_jitter_parrent->appendChild($pcr_jitter_sdv_XML);
		$pcr_jitter_parrent->appendChild($pcr_jitter_min_XML);
		$pcr_jitter_parrent->appendChild($pcr_jitter_max_XML);
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	}
	#Transport stream, goes throu @transport_streams for vidoe and audiostreams.
	if ($opt_mpeg){
	   for my $pid ( sort keys %{$pts_stats->{ $f }}  ) {
	 	if ( grep { $_ eq $pts_stats->{ $f }{ $pid }{ 'stream_id_type'} || $_ eq 'all'} @filter) {
		    #create elements
		    my $transport_stream = $doc->createElement('transport_stream');
		    my $pid_XML = $doc->createElement('pid');
		    my $stream_id_XML = $doc->createElement('stream_id');
		    my $stream_id_type_XML = $doc->createElement('stream_id_type');
		    my $num_packets_XML = $doc->createElement('mpeg_packets');
		    my $lost_packets_XML = $doc->createElement('mpeg_lost_packets');
		    my $media_loss_rate_XML = $doc->createElement('media_loss_rate');
		    my $delay_factor_XML = $doc->createElement('delay_factor');
		    my $media_bandwidth_XML = $doc->createElement('media_bandwidth');
		    #my $lost_packets_XML = $doc->createElement('mpeg_lost_packets');
		    my $dwell_avg_XML = $doc->createElement('dwell_avg');
		    my $dwell_sdv_XML = $doc->createElement('dwell_sdv');
		    my $dwell_min_XML = $doc->createElement('dwell_min');
		    my $dwell_max_XML = $doc->createElement('dwell_max');

		    #append childs.
		    $flow->appendChild($transport_stream);
		    $transport_stream->appendChild($pid_XML);
		    $transport_stream->appendChild($stream_id_XML);
		    $transport_stream->appendChild($stream_id_type_XML);
		    $transport_stream->appendChild($num_packets_XML);
		    $transport_stream->appendChild($lost_packets_XML);
		    $transport_stream->appendChild($media_loss_rate_XML);
		    $transport_stream->appendChild($media_bandwidth_XML);
		    $transport_stream->appendChild($dwell_avg_XML);
		    $transport_stream->appendChild($dwell_sdv_XML);
		    $transport_stream->appendChild($dwell_min_XML);
		    $transport_stream->appendChild($dwell_max_XML);
		    $transport_stream->appendChild($delay_factor_XML);
		    #set id 
		    $pid_XML->addText($pid);	    
		    #PES and PTS_stats
		    $stream_id_XML->addText($pts_stats{$f}{$pid}{'stream_id'});
		    $stream_id_type_XML->addText($pts_stats{$f}{$pid}{'stream_id_type'});
		    #mpeg
		    $num_packets_XML->addText($mpeg_stats{$f}{$pid}{'num'});
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		    $lost_packets_XML->addText(&format_numbers($mpeg_stats{$f}{$pid}{'lost_packets'}));
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		    $media_loss_rate_XML->addText($mpeg_stats{$f}{$pid}{'media_loss_rate'});
		    $delay_factor_XML->addText(&format_numbers($mpeg_stats{$f}{$pid}{'delay_factor'}));
		    $media_bandwidth_XML->addText($mpeg_stats{$f}{$pid}{'media_bandwidth'});
		    #dwell time
		    $dwell_avg_XML->addText(&format_numbers( (10**3) * avg($pts_stats{$f}{$pid}{'dwell_sum'}, $pts_stats{$f}{$pid}{'num'})));
		    $dwell_sdv_XML->addText(&format_numbers( (10**3) * sdv($pts_stats{$f}{$pid}{'num'}, 
						  $pts_stats{$f}{$pid}{'dwell_sum'}, 
						  $pts_stats{$f}{$pid}{'dwell_squared'}))),
		    $dwell_min_XML->addText(&format_numbers( (10**3) * $pts_stats{$f}{$pid}{'min_dwell'}));
		    $dwell_max_XML->addText(&format_numbers( (10**3) * $pts_stats{$f}{$pid}{'max_dwell'}));
	 	}
	  } 		
	 }