FLAC2Mp3 Converter, improved metadata handling, converts all flacs in current directory.

flac2mp3

#!/usr/bin/ruby
# https://gist.github.com/1361100

ID3_TAGS = {
	"TITLE" => "tt",
	"ARTIST" => "ta",
	"ALBUM" => "tl",
	"DATE" => "ty",
	"GENRE" => "tg",
	"TRACKNUMBER" => "tn",
}
CUSTOM_TAGS = {
	"COMPOSER" => "TCOM",
	"DISCNUMBER" => "TPOS",
}

#ARGV.each do|filename| 
Dir["*.flac"].each do |filename|
	abort "Usage: flac2mp3 FLACFILE" if filename.nil?

	tags = Hash.new
	custom = Hash.new
	trackTotal = 0
	discTotal = 0
	
	`metaflac --export-tags-to=- "#{filename}"`.each_line do |s|
		v=s.strip.split '=', 2
		v[0].upcase!
		v[1].gsub! '"', '\"'

		if ID3_TAGS.has_key?(v[0])
			tags[ID3_TAGS[v[0]]] = v[1]
		elsif CUSTOM_TAGS.has_key?(v[0])
			custom[CUSTOM_TAGS[v[0]]] = v[1]
		elsif "TRACKTOTAL" == v[0]
			trackTotal = v[1]
		elsif "DISCTOTAL"
			discTotal = v[1]
		end
	end

	if tags.has_key?("tn") and 0 != trackTotal 
		tags["tn"] += "/#{trackTotal}"
	end
	if custom.has_key?("TPOS") and 0 != discTotal
		custom["TPOS"] += "/#{discTotal}"
	end

	id3args = ""
	tags.each do |arg,val|
		id3args += %Q[ --#{arg} "#{val}"] 
	end
	custom.each do |id,val|
		id3args += %Q[ --tv "#{id}=#{val}"]
	end

	basename=File.basename(filename, File.extname(filename))
	puts "Encoding #{basename}.mp3"
	cmd = %Q[flac -sdc "#{filename}" | lame -V0 #{id3args} - "#{basename}.mp3"]
	system cmd
end