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#!/opt/bin/perl |
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# extract whatever data available in the currently tuned transponder |
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# this program is slightly overdesigned as it is was the base for a |
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# larger program, it still shows how to react to channel changes |
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# and scan pids and decode si info. |
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my $PID = 18; # epg data and more |
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use Event; |
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use Linux::DVB; |
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use Data::Dumper; |
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my $sniff_only = 1; # set to zero to actively tune to a channel |
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my $fe = new Linux::DVB::Frontend "/dev/dvb/adapter0/frontend0", $sniff_only ? &O_RDONLY : &O_RDWR; |
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unless ($sniff_only) { |
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$fe->set ( |
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frequency => 426000000, |
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symbol_rate => 6900000, |
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modulation => QAM_64, |
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fec_inner => FEC_AUTO, |
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inversion => INVERSION_AUTO, |
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) or die "frontend->set: $!"; |
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} |
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sub new_demux { |
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new Linux::DVB::Demux "/dev/dvb/adapter0/demux0"; |
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} |
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package scanner; |
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sub new { |
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print "new scanner\n"; |
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my $self = bless { }; |
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$self->{dmx} = ::new_demux; |
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$self->{dmx}->sct_filter ($PID, "", ""); |
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$self->{dmx}->buffer (0x10000); |
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$self->{dmx}->start; |
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$self->{w} = Event->io (fd => $self->{dmx}->fh, poll => 'r', cb => sub { |
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sysread $self->{dmx}->fh, my $data, 4096; |
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print Data::Dumper::Dumper Linux::DVB::Decode::si $data; |
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}); |
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} |
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sub DESTROY { |
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my $self = shift; |
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$self->{w}->cancel; |
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} |
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package main; |
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my $frequency = -1; |
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sub status_changed { |
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if ($fe->parameters->{frequency} != $frequency) { |
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$frequency = $fe->parameters->{frequency}; |
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undef $scanner; |
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} |
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if ($fe->status & FE_HAS_LOCK) { |
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$scanner ||= new scanner; |
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} else { |
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undef $scanner; |
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} |
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} |
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Event->io (fd => $fe->{fd}, poll => 'e', cb => sub { |
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my $event = $fe->event; |
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# tuning event, status changes not reported |
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status_changed; |
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}); |
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Event->timer (interval => 1, cb => sub { |
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#print $fe->status & FE_HAS_LOCK, "\n"; |
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}); |
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status_changed; |
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Event::loop; |
