function npt2ms(npt) {
  var ms = 0.0
  npt = String(npt);
  var p = npt.split(':')
  for(i=0;i<p.length;i++)
    ms = ms * 60 + parseFloat(p[i])
  return ms * 1000;
}

function ms2npt(ms) {
  var it, ss, mm, hh, npt;
  var it = parseInt(ms / 1000)
  ms = ms - it * 1000;
  if (ms.toString().length > 3) {
    ms = ms.toString().substring(0,3);
    }
  ss = it % 60;
  mm = ((it - ss) / 60) % 60;
  hh = ((it - (mm * 60) - ss) / 3600) % 60;
  npt = hh+':'+strpad(mm.toString(), '0', 2, 'left')
  npt += ':'+strpad(ss.toString(), '0', 2, 'left')
  npt += '.'+strpad(ms.toString(), '0', 3, 'left')
  return npt;
}

function ms2frames(ms, fmt) {
    if (!fmt) var fmt = "PAL";
    var npt = ms2npt(ms);
    var dotpos = npt.lastIndexOf(".");
    var mmStr = npt.substring(dotpos + 1, npt.length);
    var mmInt = parseInt(mmStr);
    if (fmt == 'PAL') {
      var frames = parseInt((mmInt / 1000) * 24);
    } else if (fmt == "NTSC") {
      var frames = parseInt((mmInt / 1000) * 29.97);
    }
    var framesTc = '';
    var joinToken = ":";
    var framesTc = npt.substring(0, dotpos ) + joinToken + frames;
    return framesTc;
} 

function ms2time(ms) {
    var npt = ms2npt(ms)
    return npt.substr(npt.length-9, npt.length-6);
}

function framesToNpt(timeCode) {
    var frames = timeCode.substring(9, 11);
    var ms = parseInt(frames) / 25 * 1000;
    var ms = String(ms);
    var ms = strpad(ms, '0', 3, 'right');
    var timeCodeNpt = timeCode.substring(0,8) + "." + ms;
    return timeCodeNpt;
}

function strpad(str, pad, len, dir) {
      while (str.length < len) {
      if (dir == 'left')
        str = pad + str;
      else if (dir == 'right')
        str = str + pad;
      }
      return str;
}

function isValidTimecode(tc) {
  var tc = $.trim(tc);
  var nptRegex = new RegExp("^[0-9][0-9]?\:[0-9][0-9]\:[0-9][0-9][\.|\,|\:][0-9]?[0-9]?[0-9]?$");
  return nptRegex.test(tc);to
}

//where filters is a JSON object, for eg. {'Video Files': '*.dv;*.ogg;*.ogv;*.ogx;*.avi;*.mov;*.mp4;*.mpeg;*.mpg;*.vob'}
function selectFile(filters, callback) {
    alert('select file');
    //fixme. select file
    callback && callback(fp);
}

function getFileNameExt(filename) {
  var dotPos = filename.lastIndexOf(".");
  var ext = filename.substring(dotPos + 1, filename.length);
  return ext;  
}

function getFileNameSansExt(filename) {
  var dotPos = filename.lastIndexOf(".");
  if (dotPos != '-1') {
    var filenameSansExt = filename.substring(0,dotPos);
    } else {
    var filenameSansExt = filename;
    }
  return filenameSansExt;
}