AUDIOAPI

local encoder = dfpwm.make_encoder()
local decoder = dfpwm.make_decoder()
local callback_onframe = callback_onframe or function()end
local out = fs.open(output, "wb")
for input in io.lines(input, 16 * 1024 * 2) do
  local decoded = decoder(input)
  local output = {}

  for i = 1, #decoded, 2 do
    local value_1, value_2 = decoded[i], decoded[i + 1]
    output[(i + 1) / 2] = (value_1 + value_2) / 2
  end

  out.write(encoder(output))
  callback_onframe()
  sleep(0)
end
out.close()