code: public static long calculateLastSrTimestamp(long ntp1, long ntp2) {
  		byte[] high = uIntLongToByteWord(ntp1);
  		byte[] low = uIntLongToByteWord(ntp2);
  		low[3] = low[1];
  		low[2] = low[0];
  		low[1] = high[3];
  		low[0] = high[2];
  		return bytesToUIntLong(low, 0);
  	}
docs: Calculates the time stamp of the last received SR.
  
  @param ntp
  The most significant word of the NTP time stamp
  @return The middle 32 bits out of 64 in the NTP timestamp received as
  part of the most recent RTCP sender report (SR).