DouKaku?

class Timecode(val frames:Int, val rate:Any) {
  def this(hh:Int, mm:Int, ss:Int, ff:Int, rate:Any) = this( rate match {
    case "ntsc" =>
      val minutes = hh * 60 + mm
      17982 * (minutes/10) + 1798 * (minutes%10) + ss * 30 + ff
    case r:Int =>
      val mrate = r * 60
      val hrate = mrate * 60
      hh * hrate + mm * mrate + ss * r + ff
  }, rate)

  def changeRate(r:Any) = new Timecode(frames, r)

  override def toString = rate match {
    case "ntsc" =>
      val hh = frames / 17982 / 6
      val mm = frames / 17982 % 6 * 10 + (frames % 17982 - 2) / 1798
      val ss = ((frames % 17982 - 2) % 1798 + 2) / 30
      val ff = ((frames % 17982 - 2) % 1798 + 2) % 30
      sprIntf("%02d:%02d:%02d;%02d", hh,mm,ss,ff)
    case r:Int =>
      val m = r * 60
      val h = m * 60
      val hh = frames / h
      val mm = (frames % h) / m
      val ss = ((frames % h) % m) / r
      val ff = ((frames % h) % m) % r
      sprIntf("%02d:%02d:%02d:%02d", hh,mm,ss,ff)
  }

  def +(add:Int) = new Timecode(frames + add, rate)
  def -(sub:Int) = new Timecode(frames - sub, rate)

  private def sprIntf(fmt:String, args:Any*) = String.format(fmt, args.map(e => e.asInstanceOf[AnyRef]).toArray)
}

object TimecodeTest extends Application {
  println("DROP")
  val t1 = new Timecode(0,0,59,27,"ntsc")
  (1 to 5).foreach {i => println(t1 + i) }

  println("NONDROP")
  val t2 = t1.changeRate(30)
  (1 to 5).foreach {i => println(t2 + i) }

  println("DROP 10min")
  val t4 = new Timecode(0,9,59,27, "ntsc")
  (1 to 5).foreach {i => println(t4 + i) }

  println("NONDROP 10min")
  val t3 = new Timecode(0,9,59,27, 30)
  (1 to 5).foreach {i => println(t3 + i) }
}