NAME

Audio::TagLib - Read ID3 and other audio metadata with TagLib

SYNOPSIS

use Audio::TagLib;

my $taglib = Audio::TagLib.new($path);

# Abstract API - aliases for simple fields
say $taglib.title ~ " by " ~ $taglib.artist;
say "$path has no album field set" unless $taglib.album.defined;

# Raw access to all tags in the file (as a list of pairs)
.say for $taglib.propertymap.grep(*.key eq 'ALBUMARTIST' | 'ALBUM ARTIST');

DESCRIPTION

Audio::TagLib provides Raku bindings to the TagLib audio metadata library, providing a fast way to read metadata from many audio file formats: mp3, m4a, ogg, flac, opus, and more. See https://taglib.org for more details.

Audio::TagLib vs Audio::Taglib::Simple

This module uses the C++ interface to TagLib rather than the C bindings. This means installation requires a C++ compiler, but provides the full API rather than the "abstract only" API.

This module is newer than Simple and does not yet provide tag writing functions.

This module does not keep a taglib object open and reads everything into memory initially, meaning there is no free method needed (unlike Simple).

Audio::Taglib::Simple has a lowercase 'l' in its name, where this module uses TagLib (as does the official website). I thought adjusting the case was a good idea at the time.

Abstract API

TagLib provides what is known as the "abstract API", which provides an easy interface to common tags without having to know the format-specific identifier for a given tag. This module provides these as attributes of Audio::TagLib. The following fields are available as strings (Str):

• title

• artist

• album

• comment

• genre

The following are provided as integers (Int):

• year

• track

• length - length of the file, in seconds

These attributes will be undefined if they are not present in the file.

@.propertymap

The raw tag values are available in the propertymap attribute as a List of Pairs. It is possible to have duplicate keys (otherwise this would be a hash).

If you are looking for a tag that is not available in the abstract interface, you can find it here.

Album Art

Album art can be extracted from most types of audio files. This module provides access to the first picture data in the file. Most files only have a single picture attached, so this is usually the album art.

• album-art-size - the size of the album art in bytes

• album-art-mime - the mime type of the album art, such as 'image/png'

The data can be retrieved by calling one of the following methods:

• get-album-art - returns the data as a Blob[uint8]

• get-album-art-raw - returns the data as a CArray (call .elems to get the size)

The raw variant is much faster if you are passing the data to another function that uses a CArray. If speed is important, consider using NativeHelpers::Blob to convert the raw variant.

Note that the mime type is stored in the file, and not determined from the image, so it may be inaccurate.

SEE ALSO

Audio::Taglib::Simple

https://taglib.org

AUTHOR

Adrian Kreher [email protected]

COPYRIGHT AND LICENSE

Copyright 2021-2022 Adrian Kreher

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.