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pcg |
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#!/usr/bin/perl |
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use Video::Capture::V4l; |
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use Video::Capture::VBI; |
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package Decoder; |
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use Video::Capture::VBI; |
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# derive from videotext-decoder |
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use base 'Video::Capture::VBI::VT'; |
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# just display the page |
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sub enter_page { |
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my($self,$page)=@_; |
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my $sub = $page->{ctrl} & VTX_SUB; |
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#return unless $page->{page}>=0x110 && $page->{page}<=0x134; |
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#return unless $page->{page}==0x150; |
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my $x = join ("", map { $_ ne "" ? "*" : "-" } @{$page->{packet}}); |
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printf "Teletext page %02x / %04x ($x)\n", $page->{page}, $sub; |
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#return unless $page->{page} == 0x1df; |
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# now print the page |
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for ($y=0; $y<25; $y++) |
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{ |
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my $x = $page->{packet}[$y]; |
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print $x ? decode_ansi decode_vtpage $x : "","\n"; |
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} |
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} |
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sub enter_packet { |
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my $packet = $_; |
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} |
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package main; |
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$vbi = new Video::Capture::V4l::VBI or die; |
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# the next line is optional (it enables buffering) |
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$vbi->backlog(25); # max. 1 second backlog (~900kB) |
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$inp_fd = fileno STDIN; |
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$vbi_fd = $vbi->fileno; |
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$vt = new Decoder; |
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print "Capturing VBI block. Make sure you have tuned in to a channel!\n"; |
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for(;;) { |
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my $r=""; |
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vec($r,$inp_fd,1)=1; |
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vec($r,$vbi_fd,1)=1; |
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select $r,undef,undef,0.04; |
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$vt->feed(decode_field $vbi->field, VBI_VT) while $vbi->queued; |
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if (vec($r,$inp_fd,1)) { |
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#print "HI\n"; |
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#sleep 5; |
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} |
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} |
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