usage.rb

require 'rubygems'
require 'id3lib'

# Load a tag from a file
tag = ID3Lib::Tag.new('talk.mp3')

# Get and set text frames with convenience methods
tag.title  #=> "Talk"
tag.album = 'X&Y'
tag.track = '5/13'

# Tag is a subclass of Array and each frame is a Hash
tag[0]
#=> { :id => :TPE1, :textenc => 0, :text => "Coldplay" }

# Get the number of frames
tag.length  #=> 7

# Remove all comment frames
tag.delete_if{ |frame| frame[:id] == :COMM }

# Get info about APIC frame to see which fields are allowed
ID3Lib::Info.frame(:APIC)
#=> [ 2, :APIC, "Attached picture",
#=>   [:textenc, :mimetype, :picturetype, :description, :data] ]

# Add an attached picture frame
cover = {
  :id          => :APIC,
  :mimetype    => 'image/jpeg',
  :picturetype => 3,
  :description => 'A pretty picture',
  :textenc     => 0,
  :data        => File.read('cover.jpg')
}
tag << cover

# Last but not least, apply changes
tag.update!