Audio::TagLib - Read ID3 and other audio metadata with 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');
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.
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):
The following are provided as integers (Int):
These attributes will be undefined if they are not present in the file.
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. O
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:
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.
Adrian Kreher email@example.com
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.