def _FindPeakOnActual(latency_value):
  """Find a peak on actual stream using timestamp of reference peak and delay.

  Args:
    latency_value: (tuple (float, float)) containing a timestamp and a delay
      value. Unit is seconds.

  Returns:
    (float) timestamp of the peak on the actual stream. Unit is seconds.
  """
  return latency_value[0] - latency_value[1]