# File db/cddb-cddbfile.rb, line 53
  def initialize(fn)
    @dartist = nil
    @discid = nil
    @dsecs = 0
    @dsongs = Hash.new
    @dtitle = ""
    @dyear = 1900
    # work vars
    fstart = 0
    song_frames = Array.new
    song_secs = Hash.new
    song_artists = Hash.new
    song_titles = Hash.new
    # for each line of the file
    IO.foreach(fn) {
	|ln|
	ln.chomp!
	# song start frame
	if }^#\s+([0-9]+)} =~ ln 
	  f = fstart
	  fstart = $1.to_i
	  song_frames.push(fstart - f) if f > 0
	# disc length (seconds)
	elsif }\s+([0-9]+)\s+seconds} =~ ln
	  @dsecs = $1.to_i
	  song_frames.push(sec2frames(dsecs) - fstart)
	# disc id
	elsif }^DISCID=(.+)$} =~ ln
	  @discid = $1.strip.downcase
	# disc title (artist / title)
	elsif }^DTITLE=(.+)$} =~ ln
	  @dtitle += $1.strip
	# disc year (optional)
	elsif }^DYEAR=(.+)$} =~ ln
	  @dyear = $1.to_i
	# track title
	elsif }^TTITLE([0-9]+)=(.+)$} =~ ln
	  trknum = $1.to_i + 1 
	  song_titles[trknum] = $2.strip
	  if song_titles[trknum] =~ /^(data|null|missing)(_?\d+)?/i
	    song_titles[trknum] = nil
	  end
        # track artist
	elsif }^TARTIST([0-9]+)=(.+)$} =~ ln
	  trknum = $1.to_i + 1
	  song_artists[trknum] = $2.strip
	end
    }
    tmp = @dtitle.split("/")
    @dartist = tmp.first.strip
    @dtitle = tmp.last.strip
    song_trknum = Range.new(1,song_frames.size).to_a
    song_secs = 
      Hash.zip(song_trknum.zip(song_frames.map { |f| frames2sec(f) }))
    songcnt = 0
    1.upto(song_trknum.last) {
      |i|
      if song_titles[i].nil?
	@dsongs[i] = nil
      else
	songcnt += 1
	@dsongs[i] = DiscSong.new(song_artists[i] || @dartist,
				  song_titles[i], song_secs[i])
      end
    }
    STDERR.puts("#{@dartist}/#{dtitle} has no songs!") if songcnt == 0
  end

# File db/cddb-cddbfile.rb, line 126
  def frames2sec(f)
    (f + FramesPerSec / 2) / FramesPerSec
  end

# File db/cddb-cddbfile.rb, line 131
  def sec2frames(s)
    s * FramesPerSec
  end