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|
#!/usr/bin/perl
# EPG (Electronic Program Guide Decoder)
# Commercial Name: nexTView
use Video::Capture::V4l;
use Video::Capture::VBI;
package Video::Capture::VBI::EPG;
use Video::Capture::VBI qw(:DEFAULT %VPS_CNI %VT_NI);
use Storable;
use base 'Video::Capture::VBI::VT';
sub new {
my $class = shift;
my $self = $class->SUPER::new(@_);
$self;
}
my $lastcni = -1;
sub feed {
my $self = shift;
my @r;
for ($self->SUPER::feed(@_)) {
if ($_->[0] == VBI_VPS) {
if ($_->[3] != $lastcni) {
$lastcni = $_->[3];
printf "CNI %04x (%s)\n", $_->[3], $VPS_CNI{$_->[3] & 0xfff};
}
} else {
push @r, $_;
}
}
@r;
}
sub mydump {
local $_ = shift;
if (ref $_ eq "HASH") {
print "{ ";
while(my($k,$v)=each %$_) {
print ", $k => ";
mydump($v);
}
print " }";
} elsif (ref $_ eq "ARRAY") {
print "[ ";
for (@$_) {
print ", ";
mydump($_);
}
print " ]";
} else {
y/\x20-\x7e//cd;
print $_;
}
}
sub set_epg {
my $self = shift;
my $name = shift;
my $new_db = main::gen_db_name ($name);
print "SET_EPG $new_db <= ", $self->{db_name}, "\n";
if ($self->{db_name} and $new_db eq $self->{db_name}) {
print "saving ",$new_db,"...";
Storable::nstore($self->db, "$new_db~");
rename "$new_db~", $new_db;
print "ok\n";
} else {
$self->{db_name} = $new_db;
print "trying to load $new_db...";
$self->db(eval { $self->db(Storable::retrieve($new_db)) });
print "ok\n";
}
}
# just display the page
sub enter_page {
my($self,$page)=@_;
$pages++;
return unless $page->{page} == 0x1df;
my $sub = $page->{ctrl};
my $stream = VTX_S3($sub);
my $height = VTX_S4($sub)<<3 | VTX_S2($sub);
my $seq = VTX_S1($sub);
my $s = \%{$self->{stream}{$stream}};
delete $s->{raw} unless (($seq-1)&15) == $s->{seq};
$s->{seq}=$seq;
push @{$s->{raw}}, @{$page->{packet}}[1..$height];
$packets[$stream]++;
#print "stream $stream, height $height, seq $seq, ",scalar @{$s->{raw}},"<\n";
for(decode_stream $s->{raw}) {
if (my ($dt, $bi) = decode_block $_, \@{$self->{bundle}}) {
if ($dt == 1) {
my $ai = $self->{db}{ai};
$self->set_epg($bi->{service_name});
if ($ai) {
print "$ai->{epg_version}, $ai->{epg_version_swo}, $ai->{this_network_op}, $ai->{service_name}\n";
if ($bi->{epg_version} != $ai->{epg_version}
|| $bi->{epg_version_swo} != $ai->{epg_version_swo}
|| $bi->{this_network_op} != $ai->{this_network_op}) {
print "CHANNEL SWITCH, WIPING DATABASE\n";
delete $self->{db};
}
}
$self->{db}{ai} = $bi;
} elsif ($dt == 2) {
$self->{db}{pi}{$bi->{netwop_no}}{$bi->{block_no}} = $bi;
} elsif ($dt == 3) {
$self->{db}{ni}{$bi->{block_no}} = $bi;
} elsif ($dt == 4) {
$self->{db}{oi}{$bi->{block_no}} = $bi;
} elsif ($dt == 5) {
$self->{db}{mi}{$bi->{block_no}} = $bi;
} else {
print "UNKNOWN BLOCK TYPE $dt found\n";
}
}
}
$|=1;
printf "%7d %6d %6d %5d %5d %5d %5d\r", $pages, $packets[0], $packets[1],
1*%{$self->{db}{pi}},
1*%{$self->{db}{ni}},
1*%{$self->{db}{oi}},
1*%{$self->{db}{mi}};
#printf "received epg page %04x\n", $sub;
}
sub enter_packet {
my $self = shift;
my $p = shift;
return unless $p->[3] <= 1 && $p->[2] == 30;
#printf "packet(@$p %04x)", $p->[6];
print "\n";
}
sub db {
my $self = shift;
$self->{db} = shift if @_;
$self->{db};
}
package main;
$vbi = new Video::Capture::V4l::VBI or die;
# the next line is optional (it enables buffering)
$vbi->backlog(150); # max. 5 seconds backlog (~4.6Mb)
$inp_fd = fileno STDIN;
$vbi_fd = $vbi->fileno;
$vt = new Video::Capture::VBI::EPG;
sub gen_db_name {
shift() . ".epg";
}
print "Capturing VBI block. Make sure you have tuned in to a channel with EPG!\n";
print "Aquisition may take up to twenty minutes (and more)!\n";
for(;;) {
my $r="";
vec($r,$inp_fd,1)=1;
vec($r,$vbi_fd,1)=1;
select $r,undef,undef,0.04;
$vt->feed(decode_field $vbi->field, VBI_VT|VBI_VPS) while $vbi->queued;
if (vec($r,$inp_fd,1)) {
$_ = <STDIN>;
if (/^q/i) {
last;
}
}
}
|
