buffered-tools.js

var pb = function prettifyBuffered(buffered) {
  var str = "";
  var start, end, fixedStart, fixedEnd, fixedDuration, nextStart, fixedDiff;
  for (var i = 0; i < buffered.length; i++) {
    start = buffered.start(i);
    end = buffered.end(i);
    fixedStart = start.toFixed(2);
    fixedEnd = end.toFixed(2);
    fixedDuration = (end - start).toFixed(2);
    str += `|${fixedStart}----(${fixedDuration})----|${fixedEnd}`;
    if (i < buffered.length - 1) {
      nextStart = buffered.start(i + 1);
      fixedDiff = (nextStart - end).toFixed(2);
      str += ` <${fixedDiff}> `;
    }
  }
  return str;
};

var fp = function findPosition(position, buffered) {
  var start, end;
  for (var i = 0; i < buffered.length; i++) {
    start = buffered.start(i);
    end = buffered.end(i);
    if (position >= start && position < end) {
      var rep = {
        pos: position,
        current: {
          start: start,
          end: end,
        },
        prev: i === 0 ? null : {
          start: buffered.start(i - 1),
          end: buffered.end(i - 1),
        },
        next: i >= buffered.length -1 ? null : {
          start: buffered.start(i + 1),
          end: buffered.end(i + 1),
        },
      };
      rep.diffWithNext = rep.next ?
        rep.next.start - rep.pos : null;
      rep.diffWithPrev = rep.prev ?
        rep.pos - rep.prev.end : null;
      return rep;
    } else if (position < start) {
      var rep = {
        pos: position,
        current: null,
        prev: i === 0 ? null : {
          start: buffered.start(i - 1),
          end: buffered.end(i - 1),
        },
        next: {
          start: buffered.start(i),
          end: buffered.end(i),
        },
      };
      rep.diffWithNext = rep.next ?
        rep.next.start - rep.pos : null;
      rep.diffWithPrev = rep.prev ?
        rep.pos - rep.prev.end : null;
      return rep;
    }
  }
  var rep = buffered.length ? {
    pos: position,
    current: null,
    prev: {
      start: buffered.start(buffered.length - 1),
      end: buffered.end(buffered.length - 1),
    },
    next: null,
    diffWithNext: null,
  } : {
    pos: position,
    current: null,
    prev: null,
    next: null,
    diffWithNext: null,
  }
  rep.diffWithPrev = rep.prev ?
    rep.pos - rep.prev.end : null;
  return rep;
};

console.log(
  pb(player.getVideoElement().buffered),
  "\n",
  fp(player.getPosition(), player.getVideoElement().buffered)
);