local inputlabels = {"P1 A", "P1 B", "P1 Select", "P1 Start", "P1 Right", "P1 Left", "P1 Up", "P1 Down"}

function getinputbyte()
  if not movie.isloaded() then
    return 0
  end

  local t = movie.getinput(emu.framecount())
  local b = 0

  for i = 0, 7 do
    if t[inputlabels[i + 1]] then
      b = b + bit.lshift(1, i)
    end
  end

  return b
end

function tryinput(file)
  local input = getinputbyte()

  if input ~= lastinput then
    local cycles = emu.totalexecutedcycles();

    cycles = (cycles + 70224 * 14 - 456 * 90 - 1024) / 1024;

    file:write(string.format("%08X %04X", cycles, input))
    file:write("\n")
    lastinput = input
  end
end

local timestamps = io.open("timestamps.txt", "w")
local lastinput = -1

tryinput(timestamps)

while emu.framecount() <= movie.length() do

  tryinput(timestamps)

  emu.frameadvance()
end

tryinput(timestamps)
timestamps:close()

client.pause()