NAME

       Audio::FLAC::Header - interface to FLAC header metadata.

SYNOPSIS

               use Audio::FLAC::Header;
               my $flac = Audio::FLAC::Header->new("song.flac");

               my $info = $flac->info();

               foreach (keys %$info) {
                       print "$_: $info->{$_}\n";
               }

               my $tags = $flac->tags();

               foreach (keys %$tags) {
                       print "$_: $tags->{$_}\n";
               }

DESCRIPTION

       This module returns a hash containing basic information about a FLAC file, a
       representation of the embedded cue sheet if one exists,  as well as tag information
       contained in the FLAC file's Vorbis tags.  There is no complete list of tag keys for
       Vorbis tags, as they can be defined by the user; the basic set of tags used for FLAC files
       include:

               ALBUM
               ARTIST
               TITLE
               DATE
               GENRE
               TRACKNUMBER
               COMMENT

       The information returned by Audio::FLAC::info is keyed by:

               MINIMUMBLOCKSIZE
               MAXIMUMBLOCKSIZE
               MINIMUMFRAMESIZE
               MAXIMUMFRAMESIZE
               TOTALSAMPLES
               SAMPLERATE
               NUMCHANNELS
               BITSPERSAMPLE
               MD5CHECKSUM

       Information stored in the main hash that relates to the file itself or is calculated from
       some of the information fields is keyed by:

               trackLengthMinutes      : minutes field of track length
               trackLengthSeconds      : seconds field of track length
               trackLengthFrames       : frames field of track length (base 75)
               trackTotalLengthSeconds : total length of track in fractional seconds
               bitRate                 : average bits per second of file
               fileSize                : file size, in bytes

CONSTRUCTORS

   "new ($filename)"
       Opens a FLAC file, ensuring that it exists and is actually an FLAC stream, then loads the
       information and comment fields.

INSTANCE METHODS

       •   info( [$key] )

           Returns a hashref containing information about the FLAC file from the file's
           information header.

           The optional parameter, key, allows you to retrieve a single value from the info hash.
           Returns "undef" if the key is not found.

       •   tags( [$key] )

           Returns a hashref containing tag keys and values of the FLAC file from the file's
           Vorbis Comment header.

           The optional parameter, key, allows you to retrieve a single value from the tag hash.
           Returns "undef" if the key is not found.

       •   cuesheet( )

           Returns an arrayref which contains a textual representation of the cuesheet metada
           block. Each element in the array corresponds to one line in a .cue file. If there is
           no cuesheet block in this FLAC file the array will be empty. The resulting cuesheet
           should match the output of metaflac's --export-cuesheet-to option, with the exception
           of the FILE line, which includes the actual file name instead of "dummy.wav".

       •   seektable( )

           Returns the seektable. Currently disabled for performance.

       •   application( $appId )

           Returns the application block for the passed id.

       •   picture( [$type ] )

           Returns a hash containing data from a PICTURE block if found.

           Defaults to type 3 - "Front Cover"

           When the passed variable is 'all', an array of hashes containing picture data from all
           PICTURE blocks is returned. Allows for multiple instances of the same picture type.

       •   set_separator( )

           For multi-value ID3 tags, set the separator string. Defaults to '/'

       •   vendor_string( )

           Returns the vendor string.

       •   set_vendor_string( $string )

           Set the vendor string. Will be written on write()

       •   write( )

           Writes the current contents of the tag hash to the FLAC file, given that there's
           enough space in the header to do so. If there's insufficient space available (using
           pre-existing padding), the file will remain unchanged, and the function will return a
           zero value.

SEE ALSO

       <http://flac.sourceforge.net/format.html>

AUTHORS

       Dan Sully, <daniel@cpan.org>

COPYRIGHT

       Pure perl code Copyright (c) 2003-2004, Erik Reckase.

       Pure perl code Copyright (c) 2003-2007, Dan Sully & Slim Devices.  Pure perl code
       Copyright (c) 2008-2009, Dan Sully

       XS code Copyright (c) 2004-2007, Dan Sully & Slim Devices.  XS code Copyright (c)
       2008-2009, Dan Sully

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.8.2 or, at your option, any later version of
       Perl 5 you may have available.