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);
  }

function selectFile() {
    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
    const nsIFilePicker = Components.interfaces.nsIFilePicker;
    var fp = Components.classes["@mozilla.org/filepicker;1"].createInstance(nsIFilePicker);
    fp.init(window, "Choose a File", nsIFilePicker.modeOpen);
    fp.appendFilters(nsIFilePicker.filterAll | nsIFilePicker.filterText);
    fp.appendFilters("Video Files", "*.ogg;*.ogv;*.ogx;*.dv;*.avi;*.mov");
    var rv = fp.show();
    if (rv == nsIFilePicker.returnOK || rv == nsIFilePicker.returnReplace) {
        var file = fp.file;
        var path = fp.file.path;
        return path;
    }
    return false;
}


function mozillaSaveFile(filePath,content)
{
	if(window.Components) {
		try {
			netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
			var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
			file.initWithPath(filePath);
			if(!file.exists())
				file.create(0,0664);
      var os = Components.classes["@mozilla.org/intl/converter-output-stream;1"].createInstance(Components.interfaces.nsIConverterOutputStream);
			var out = Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);
      out.init(file,0x20|0x02,00004,null);      
      os.init(out, "UTF-8", 0, 0x0000);
      os.writeString(content);			
			//out.write(content,content.length);
      os.close();			
      //out.flush();
      out.close();      		
      return true;      
		} catch(ex) {
      alert(ex);
			return false;
		}
	}
	return null;
}

// Returns null if it can't do it, false if there's an error, or a string of the content if successful
function mozillaLoadFile(filePath)
{
	if(window.Components) {
		try {
			netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
			var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
			file.initWithPath(filePath);
			if(!file.exists())
				return null;
			var inputStream = Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(Components.interfaces.nsIFileInputStream);
			inputStream.init(file,0x01,00004,null);
			//var sInputStream = Components.classes["@mozilla.org/scriptableinputstream;1"].createInstance(Components.interfaces.nsIScriptableInputStream);
			//sInputStream.init(inputStream);
      var charset = "UTF-8";
      const replacementChar = Components.interfaces.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER;
      var cInputStream = Components.classes["@mozilla.org/intl/converter-input-stream;1"]
                   .createInstance(Components.interfaces.nsIConverterInputStream);
      cInputStream.init(inputStream, charset, 1024, replacementChar);
      var str = {};
      var contents = '';
      while (cInputStream.readString(4096, str) != 0) {
        contents += str.value;
        }

			//var contents = sInputStream.read(sInputStream.available());
      cInputStream.close();
			//sInputStream.close();
			inputStream.close();
			return contents;
		} catch(ex) {
      alert(ex);
			return false;
		}
	}
	return null;
}


function checkFileExists(filePath) {
  if(window.Components) {
    try {
      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
      var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
      file.initWithPath(filePath);
      if (file.exists()) {
        return true;
        } else {
        return false;
        }
      } catch(ex) {
      //alert("Error");
      return null;
      }
    }
  }
   
function getFileNameSansExt(filename) {
  var dotPos = filename.lastIndexOf(".");
  if (dotPos != '-1') {
    var filenameSansExt = filename.substring(0,dotPos);
    } else {
    var filenameSansExt = filename;
    }
  return filenameSansExt;
  }