ruby-mp3info read low-level informations and manipulate tags on mp3 files.
- Written in pure ruby
- Read low-level informations like bitrate, length, samplerate, etc...
- Read, write, remove id3v1 and id3v2 tags
- Correctly read VBR files (with or without Xing header)
- Only 2.3 version is supported for writings id3v2 tags
- id3v2 tags are always written in UTF-16 encoding
require "mp3info"
# Read and display infos & tags
Mp3Info.open("myfile.mp3") do |mp3info|
puts mp3info
end
# read/write tag1 and tag2 with Mp3Info#tag attribute
# when reading tag2 have priority over tag1
# when writing, each tag is written.
Mp3Info.open("myfile.mp3") do |mp3|
puts mp3.tag.title
puts mp3.tag.artist
puts mp3.tag.album
puts mp3.tag.tracknum
mp3.tag.title = "track title"
mp3.tag.artist = "artist name"
end
# tags are written when calling Mp3Info#close or at the end of the #open block
### access id3v2 tags
Mp3Info.open("myfile.mp3") do |mp3|
# you can access four letter v2 tags like this
puts mp3.tag2.TIT2
mp3.tag2.TIT2 = "new TIT2"
# or like that
mp3.tag2["TIT2"]
# at this time, only COMM tag is processed after reading and before writing
# according to ID3v2#options hash
mp3.tag2.options[:lang] = "FRE"
mp3.tag2.COMM = "my comment in french, correctly handled when reading and writing"
end
### image manipulation
file = File.new('input_img','rb')
Mp3Info.open '1.mp3' do |m|
pictures = m.tag2.pictures # array of images :
pictures.each do |description, data|
# description ends with (.jpg / .png) for easy writing to file
File.binwrite(description, data)
end
m.tag2.remove_pictures # remove all images
m.tag2.add_picture(file.read) # add a single image to APIC tag
# **optionally**, you may include options for the image tag to add_picture():
# options = { mime: 'jpeg|gif|png', description: "description",
# pic_type: 0 }
# There is no need to specify mime or options because the mime is guessed based on the input image
# Only one image is permitted in the mp3 for compatibility. add_picture() overwrites all previous images.
# Please note:
# If supplying :mime option just supply the mime 'jpeg', 'gif' or 'png', the code adds the "image/.." for you!
# e.g. m.tag2.add_picture(file.read, mime: 'jpeg', pic_type: 3) gets a mime "image/jpeg"
end- iconv when using ruby 1.8
gem install ruby-mp3info
After checking out the source, run:
$ rake newb
This task will install any missing dependencies, run the tests/specs, and generate the RDoc.
ruby
- encoder detection
- support for more tags in id3v2
- generalize id3v2 with other audio formats (APE, MPC, OGG, etc...)