#!/usr/bin/perl
  # Copyright 2015 GoVivace Inc. (Author: Nagendra Kumar Goel)
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #  http://www.apache.org/licenses/LICENSE-2.0
  #
  # THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
  # WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
  # MERCHANTABLITY OR NON-INFRINGEMENT.
  # See the Apache 2 License for the specific language governing permissions and
  # limitations under the License.
  
  # Analyze a segments file and print important stats on it.
  
  $dur = $total = 0;
  $maxDur = 0;
  $minDur = 9999999999;
  $n = 0;
  while(<>){
      chomp;
      @t = split(/\s+/);
      $dur = $t[3] - $t[2];
      $total += $dur;
      if ($dur > $maxDur) {
          $maxSegId = $t[0];
          $maxDur = $dur;
      }
      if ($dur < $minDur) {
          $minSegId = $t[0];
          $minDur = $dur;
      }
      $n++;
  }
  $avg=$total/$n;
  $hrs = $total/3600;
  print "Total $hrs hours of data
  ";
  print "Average segment length $avg seconds
  ";
  print "Segment $maxSegId has length of $maxDur seconds
  ";
  print "Segment $minSegId has length of $minDur seconds
  ";