canvas_monitor.js

function beep(){
    "use strict";
    if(!beep.ele){
      beep.ele=document.createElement("audio");
      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    }
    beep.ele.play();
}
function canvas_monitor(canvas, interval=5){
  //"use strict";
  if(canvas_monitor.stop){
        canvas_monitor.stop=false;
        canvas_monitor.alarm=false;
        return;
  }
  canvas_monitor.interval=interval;
    if(canvas_monitor.alarm){
          setTimeout(canvas_monitor,1*1000,canvas,interval);
          beep();
          return;
    }
  setTimeout(canvas_monitor,interval*1000,canvas,interval);
  let now=canvas.toDataURL();
  if(now===canvas_monitor.last){
    canvas_monitor.alarm=true;
    canvas_monitor(canvas,interval);
  }else{
    canvas_monitor.last=now;
  }
}