scan a directory for audio files

dir_scan.rb

def dir_scan(src, files = [])
  Dir.foreach(src) do |e|
    # Don't bother with . and .. 
    next if [".",".."].include? e
    fullname = src + "/" + e
  
    if FileTest::directory?(fullname)
      files = dir_scan(fullname, files)
    else
      if (e.match("(.)m4a") || e.match("(.)aac") || e.match("(.)mp3"))
        files << fullname
      else
        puts "unkown format: #{fullname}"
      end
    end
  end
  files
end

files = dir_scan src