Convert/CD/TOCFile.pm

=head1 NAME

Convert::CD::TOCFile - base class to represent TOC files.

=head1 SYNOPSIS

 use Convert::CD::TOCFile;

 # to be done

=head1 DESCRIPTION

A TOCFile object is used to represent file-format-specific information
about an image, such as image or track filenames and read/write
functionality for toc files.

=head2 Convert:CD::TOCFile METHODS

=over 4

=cut

package Convert::CD::TOCFile;

$VERSION = 0.01;

use File::Spec;
use Carp;

use Convert::CD;

use base Convert::CD::TOCFile;

=item Convert::CD::TOCFile->autodetect (path)

Try to autodetect the type of image (or tocfile) identified by C<path>. Returns
a list of TOCFile-Classes to try.

=cut

sub autodetect {
   my ($self, $path) = @_;
   my @r;

   # shouldn't use ending... but Class->autodetect.

   #push @r, Convert::CD::Toc
   #   if $self->find_tocfile ("toc", "TOC", "Toc");

   #push @r, Convert::CD::Ccd
   #   if $self->find_tocfile ("ccd", "CCD", "Ccd");

   push @r, Convert::CD::Cue
      if $self->find_tocfile ("cue", "CUE", "Cue");

   #push @r, Convert::CD::Nrg # bad
   #   if $self->find_tocfile ("nrg", "NRG", "Nrg");

   push @r, Convert::CD::Analyze;

   @r;
}

=item new param => value...

Create a new Convert::CD::TOCFile object.

Parameters:

 path       the base image filename

=cut

sub new {
   my $class = shift;
   my $self = bless { @_, }, $class;

   $self;
}

=item $toc->find_tocfile suffixes..

Try to find a tocfile by probing the given suffixes.

=cut

sub find_tocfile {
   my ($self, @ext) = @_;

   my $stem = $self->{path};

   $stem =~ s/\.\S{2,4}$//;

   for (@ext) {
      return "$stem.$_" if -f "$stem.$_";
   }

   ();
}

=item $cd = $toc->read

Read the TOC file, returns a new Convert::CD object.

=item $toc->write ($cd)

Write the TOC File using the information in the given Convert::CD object.

=cut

sub read {
   my ($self) = @_;

   my $cd = new Convert::CD path => $self->{path}
      or croak "unable to create a new Convert::CD object";

   $self->_read ($cd);

   $cd;
}

sub write {
   my ($self, $cd) = @_;

   $self->_write ($cd);
}

# abstract methods
sub _read {
   my ($self, $cd) = @_;

   croak sprintf "reading %s toc files is not supported", ref $self;
}

sub _write {
   my ($self, $cd) = @_;

   croak sprintf "writing %s toc files is not supported", ref $self;
}

=item $msf = Convert::CD::TOCFile->parse_msf ($string)

Parses a time and returns it as a frame number (can be negative if the
string contains a leading minus).

Returns C<undef> on error.

=cut

sub parse_msf {
   $_[1] =~ /^(-?\d+):(\d+):(\d+)$/
      or return undef;
   ($1 * 60 + $2) * 75 + $3;
}

1;

=back

=head1 AUTHOR

 Marc Lehmann <pcg@goof.com>

=cut

Revision:	1.4
Committed:	Wed Jun 11 10:50:58 2003 UTC (23 years, 3 months ago) by root
Branch:	MAIN
Changes since 1.3:	+30 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3			Convert::CD::TOCFile - base class to represent TOC files.
4
5			=head1 SYNOPSIS
6
7			use Convert::CD::TOCFile;
8
9			# to be done
10
11			=head1 DESCRIPTION
12
13			A TOCFile object is used to represent file-format-specific information
14			about an image, such as image or track filenames and read/write
15			functionality for toc files.
16
17			=head2 Convert:CD::TOCFile METHODS
18
19			=over 4
20
21			=cut
22
23			package Convert::CD::TOCFile;
24
25			$VERSION = 0.01;
26
27			use File::Spec;
28			use Carp;
29
30			use Convert::CD;
31
32			use base Convert::CD::TOCFile;
33
34	root	1.4	=item Convert::CD::TOCFile->autodetect (path)
35
36			Try to autodetect the type of image (or tocfile) identified by C<path>. Returns
37			a list of TOCFile-Classes to try.
38
39			=cut
40
41			sub autodetect {
42			my ($self, $path) = @_;
43			my @r;
44
45			# shouldn't use ending... but Class->autodetect.
46
47			#push @r, Convert::CD::Toc
48			# if $self->find_tocfile ("toc", "TOC", "Toc");
49
50			#push @r, Convert::CD::Ccd
51			# if $self->find_tocfile ("ccd", "CCD", "Ccd");
52
53			push @r, Convert::CD::Cue
54			if $self->find_tocfile ("cue", "CUE", "Cue");
55
56			#push @r, Convert::CD::Nrg # bad
57			# if $self->find_tocfile ("nrg", "NRG", "Nrg");
58
59			push @r, Convert::CD::Analyze;
60
61			@r;
62			}
63
64	root	1.1	=item new param => value...
65
66	root	1.2	Create a new Convert::CD::TOCFile object.
67	root	1.1
68			Parameters:
69
70			path the base image filename
71
72			=cut
73
74			sub new {
75			my $class = shift;
76			my $self = bless { @_, }, $class;
77
78			$self;
79			}
80
81			=item $toc->find_tocfile suffixes..
82
83			Try to find a tocfile by probing the given suffixes.
84
85			=cut
86
87			sub find_tocfile {
88			my ($self, @ext) = @_;
89
90			my $stem = $self->{path};
91
92	root	1.2	$stem =~ s/\.\S{2,4}$//;
93	root	1.1
94			for (@ext) {
95			return "$stem.$_" if -f "$stem.$_";
96			}
97
98			();
99			}
100
101			=item $cd = $toc->read
102
103			Read the TOC file, returns a new Convert::CD object.
104
105			=item $toc->write ($cd)
106
107			Write the TOC File using the information in the given Convert::CD object.
108
109			=cut
110
111			sub read {
112			my ($self) = @_;
113
114			my $cd = new Convert::CD path => $self->{path}
115			or croak "unable to create a new Convert::CD object";
116
117			$self->_read ($cd);
118	root	1.2
119			$cd;
120	root	1.1	}
121
122			sub write {
123			my ($self, $cd) = @_;
124
125			$self->_write ($cd);
126			}
127
128			# abstract methods
129			sub _read {
130			my ($self, $cd) = @_;
131
132			croak sprintf "reading %s toc files is not supported", ref $self;
133			}
134
135			sub _write {
136			my ($self, $cd) = @_;
137
138			croak sprintf "writing %s toc files is not supported", ref $self;
139			}
140
141	root	1.3	=item $msf = Convert::CD::TOCFile->parse_msf ($string)
142
143			Parses a time and returns it as a frame number (can be negative if the
144			string contains a leading minus).
145
146			Returns C<undef> on error.
147
148			=cut
149
150			sub parse_msf {
151			$_[1] =~ /^(-?\d+):(\d+):(\d+)$/
152			or return undef;
153			($1 * 60 + $2) * 75 + $3;
154			}
155
156	root	1.1	1;
157
158			=back
159
160			=head1 AUTHOR
161
162			Marc Lehmann <pcg@goof.com>
163
164			=cut
165