mp3 classify

#classify.rb - set id3 tags on mp3 files

require 'mp3info' #from http://ruby-mp3info.rubyforge.org/

MUSICDNS = "<path to example.exe from MusicDNS>"
MUSICDIR = "<path to your music directory>"

def build_filename(fn)
	"#{MUSICDIR + '/' + fn}"
end

def analyze_file(fn)
	system("#{MUSICDNS} \"#{fn}\" > tmpfile.musicdns")
	lines = IO.readlines("tmpfile.musicdns")
	File.delete("tmpfile.musicdns")
	title = lines[1][7..-1].strip
	artist = lines[2][7..-1].strip
	return title, artist
end

def get_id3_info(fn)
	Mp3Info.open(fn) do |mp3|
		return mp3.tag.title, mp3.tag.artist
	end
end

def set_id3_info(fn, title, artist)
	Mp3Info.open(fn) do |mp3|
		mp3.tag.title = title
		mp3.tag.artist = artist
	end
end

puts "filename, id3 artist, mdns artist, id3 title, mdns title"
Dir.entries(MUSICDIR).grep(/\.mp3/).each do |f|
	fullpath = build_filename(f)
	mtitle, martist = analyze_file(fullpath)
	id3title, id3artist = get_id3_info(fullpath)
	if id3title.nil? and id3artist.nil?
		set_id3_info(fullpath, mtitle, martist)
	elsif id3title != mtitle or id3artist != martist
		puts "#{f}, #{id3artist}, #{martist}, #{id3title}, #{mtitle}"
	end
end