sox-play/lib/PlayerPosition.js

play sound files via sox's `play` command

/*jslint node: true */

'use strict';

var regex_playTime = /(\d{2}):(\d{2}):(\d{2})\.(\d{2})/;

function PlayerPosition(h, m, s, f){
  this.set(h, m, s, f);
}

PlayerPosition.prototype.copy = function(p){
  this.hours = p.hours;
  this.minutes = p.minutes;
  this.seconds = p.seconds;
  this.frac = p.frac;

  return this;
};

PlayerPosition.prototype.set = function(h, m, s, f){
  if('string' === typeof h){
    var matches = regex_playTime.exec(h);
    if(matches){
      h = +matches[1];
      m = +matches[2];
      s = +matches[3];
      f = +matches[4];
    }
  }

  if(h instanceof PlayerPosition){
    this.copy(h);
  }else{
    this.hours = h;
    this.minutes = m;
    this.seconds = s;
    this.frac = f;
  }

  return this;
};

PlayerPosition.prototype.zero = function(){
  this.hours = 0;
  this.minutes = 0;
  this.seconds = 0;
  this.frac = 0;

  return this;
};

PlayerPosition.prototype.neutralize = function(){
  return this.set();
}

PlayerPosition.prototype.add = function(h, m, s, f){
  this.hours += h;
  this.minutes += m;
  this.seconds += s;
  this.frac += f;

  this.normalize();

  return this;
};

PlayerPosition.prototype.addHours   = function(h){ return this.add(h, 0, 0, 0); };
PlayerPosition.prototype.addMinutes = function(m){ return this.add(0, m, 0, 0); };
PlayerPosition.prototype.addSeconds = function(s){ return this.add(0, 0, s, 0); };
PlayerPosition.prototype.addFrac    = function(f){ return this.add(0, 0, 0, f); };

PlayerPosition.prototype.normalize = function(){
  var overflow;
  overflow = (this.frac / 100) | 0;
  this.frac %= 100;
  
  this.seconds += overflow;
  overflow = (this.seconds / 60) | 0;
  this.seconds %= 60;

  this.minutes += overflow;
  overflow = (this.minutes / 60) | 0;
  this.minutes %= 60;

  this.hours += overflow;

  return this;
};

function isNumber(n){
  return 'number' === typeof n;
}
function zeroPad(i){
  return ('00'+(i|0)).substr(-2);
}
PlayerPosition.prototype.toString = function(){
  var h = this.hours,
      m = this.minutes,
      s = this.seconds,
      f = this.frac;

    if( !(isNumber(h) && isNumber(m) && isNumber(s) && isNumber(f) ) ){
      return '--:--:--.--';
    }
    return ''+zeroPad(h)+':'+zeroPad(m)+':'+zeroPad(s)+'.'+zeroPad(f);
};

PlayerPosition.prototype.valueOf = function(){
  var h = this.hours,
      m = this.minutes,
      s = this.seconds,
      f = this.frac;
  return (60*h + m)*60 + s + (f/100);
};

module.exports = PlayerPosition;