Disc Changer Implementation

local timerID
os.loadAPI("cd")

-- Start first disc
cd.eject()
sleep(0.1)
if cd.load() then
  timerID = os.startTimer(cd.play())
else
  cd.reset()
  timerID = os.startTimer(5)
end

-- Main loop
while true do
  local e,p1,p2,p3 = os.pullEvent()

  -- Change disc
  if (e == "timer" and p1==timerID) then
    cd.stop()
    cd.eject()
    sleep(0.1)
    if cd.load() then
      timerID = os.startTimer(cd.play())
    else
      cd.reset()
      timerID = os.startTimer(5)
    end
  end
end