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#!/usr/bin/perl -w
# Example demonstrating the parsing of raw CD-Text files
#
# Copyright (C) 2017 Rocky Bernstein <rocky@gnu.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# use Enbugger; Enbugger->load_debugger('trepan'); Enbugger->stop;
use strict;
use lib '../blib/lib';
use lib '../blib/arch';
use perlcdio;
use Device::Cdio;
use Device::Cdio::Device;
sub print_cdtext_track_info($$)
{
my ($cdtext_ref, $t) = @_;
if ($t != 0) {
printf("Track #%2d\n", $t);
} else {
printf "CD-Text title for Disc\n";
}
foreach my $field (sort keys %{$cdtext_ref}) {
printf "\t%s: %s\n", $Device::Cdio::CDTEXT_FIELD_by_id{$field},
$cdtext_ref->{$field} if defined($cdtext_ref->{$field});
}
}
sub print_cdtext_info($)
{
my $cdtext = shift;
my $cdtext_fields = {};
for (my $field=$perlcdio::MIN_CDTEXT_FIELD;
$field <= $perlcdio::MAX_CDTEXT_FIELDS; $field++) {
$cdtext_fields->{$field} = perlcdio::cdtext_get_const($cdtext, $field, 0);
}
print_cdtext_track_info($cdtext_fields, 0);
}
sub read_cdtext($)
{
my ($path) = @_;
if (!open(FP, "<:raw", $path)) {
print STDERR "cannot open $path for input: $!";
exit(3);
}
my $size = read FP, my $cdt_data, 9220;
close(FP);
if ($size < 5) {
print STDERR sprintf("file `%s' is too small to contain CD-TEXT\n", $path);
exit(1);
}
# Truncate header when it is too large. The standard is ambiguous here
$size -= 4 if ord(substr($cdt_data, 0, 1)) > 0x80;
# ignore trailing 0
$size -= 1 if (1 == $size % 18);
# init cdtext */
my $cdt = perlcdio::cdtext_init();
my $rc = Device::Cdio::Device::cdtext_data_init($cdt, $cdt_data, $size);
if ($rc !=0 ) {
printf STDERR "failed to parse CD-Text file `%s'\n", $path;
return undef;
}
return $cdt;
}
die "usage: $0 cdtext.data" if @ARGV != 1;
my $cdt_path=$ARGV[0];
my $cdt = read_cdtext($cdt_path);
print_cdtext_info($cdt) if $cdt;
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