var synth = window.speechSynthesis;
oldtext="";
newtext="";
nextext="";
function prepareText(s,f){
var res="";
//if(s==oldtext)return "";
 nextext+=s.replace(oldtext,"");
if(!f){
 res=nextext;nextext="";}
 oldtext=s;
return res;

};

 rate =1.52;
var voices = [];

  voices = synth.getVoices().sort(function (a, b) {
      const aname = a.name.toUpperCase(), bname = b.name.toUpperCase();
      if ( aname < bname ) return -1;
      else if ( aname == bname ) return 0;
      else return +1;
  })



function speak(text){
    if (synth.speaking||text=="") {

        return;
    }

    var utterThis = new SpeechSynthesisUtterance(text);
    utterThis.onend = function (event) {

    }

    utterThis.onerror = function (event) {

        console.error('SpeechSynthesisUtterance.onerror');
    }

        utterThis.voice = voices[1];        //Голос

    utterThis.pitch = 1; //высота
    utterThis.rate = rate;     //скорост?
    synth.speak(utterThis);


}


document.styleSheets[0].insertRule(".caption-window {display:none}")
setInterval(function(){

if(document.getElementsByClassName('ytp-caption-segment').length>0){
    newtext=document.getElementsByClassName('ytp-caption-segment')[document.getElementsByClassName('ytp-caption-segment').length-1].innerText.replace(/[\n\t]/gi," ");
    speak(prepareText(newtext,synth.speaking)); document.title=nextext;
}
},100);