@byomakase/vu-meter/dist/vu-meter.es.js

A customizable peak meter using the web audio API

const Q = {
  vertical: !1,
  borderSize: 2,
  fontSize: 9,
  backgroundColor: "black",
  tickColor: "#ddd",
  labelColor: "#ddd",
  gradient: ["red 1%", "#ff0 16%", "lime 45%", "#080 100%"],
  dbRangeMin: -48,
  dbRangeMax: 0,
  dbTickSize: 6,
  maskTransition: "0.1s",
  peakHoldDuration: 0,
  scale: "default",
  scaleOffset: 0
};
function Z(t, r) {
  return Math.log(r) / Math.log(t);
}
function O(t) {
  return Z(10, t) * 20;
}
function N(t, r, e) {
  const n = [];
  for (let o = Math.floor(t) + 1; o <= r; o += 1)
    o % e === 0 && n.push(o);
  return n;
}
const T = 3, $ = 1.5, Y = 1.5, q = 2;
function ee(t, r, e, n) {
  let o = Math.floor((e - t) * 100 / (e - r));
  return o > 100 && (o = 100), o < 0 && (o = 0), n ? `inset(${o}% 0 0)` : `inset(0 ${o}% 0 0)`;
}
function te(t, r) {
  const { backgroundColor: e, borderSize: n, vertical: o } = r, i = document.createElement("div");
  return i.style.backgroundColor = e, i.style.boxSizing = "border-box", i.style.height = "100%", i.style.padding = `${n}px`, o && (i.style.display = "flex", i.style.flexDirection = "row-reverse"), t.appendChild(i), i;
}
function re(t, r) {
  const { dbRangeMin: e, dbRangeMax: n, dbTickSize: o, fontSize: i, borderSize: s, tickColor: u, vertical: c, scale: a, scaleOffset: f } = r, b = N(e, n, o), d = document.createElement("div");
  d.style.position = "relative";
  const l = a === "nordic";
  return c ? (d.style.height = `calc(100% - ${i * $}px)`, d.style.width = l ? `${i * 3}px` : `${i * q}px`, d.style.marginTop = `${i * $}px`) : (d.style.height = `${i * Y}px`, d.style.width = `calc(100% - ${i * T}px)`, d.style.marginRight = `${i * T}px`), t.appendChild(d), b.map((h) => {
    const y = document.createElement("div");
    d.appendChild(y), y.style.position = "absolute", y.style.color = l && h + f >= 6 ? "red" : u, y.style.fontSize = `${i}px`, y.textContent = l && h === -9 ? "TEST" : (h + f).toString();
    const k = (n - h) / (n - e) * 100;
    return c ? (y.style.top = `calc(${k}% - ${i / 2}px)`, y.style.right = `${s}px`, y.style.textAlign = "right") : (y.style.right = `${k}%`, y.style.transform = "translateX(50%)"), y;
  });
}
function ne(t, r, e) {
  const { fontSize: n, vertical: o, borderSize: i } = r, s = document.createElement("div");
  s.style.display = "flex", s.style.justifyContent = "space-between", o ? (s.style.height = "100%", s.style.width = `calc(100% - ${n * q}px)`) : (s.style.height = `calc(100% - ${n * Y}px)`, s.style.width = "100%", s.style.flexDirection = "column"), t.appendChild(s);
  const u = (e - 1) * i;
  return Array.from(Array(e).keys()).map(() => {
    const a = document.createElement("div");
    return o ? (a.style.height = "100%", a.style.width = `calc((100% - ${u}px) / ${e})`) : (a.style.display = "flex", a.style.height = `calc((100% - ${u}px) / ${e})`, a.style.width = "100%", a.style.flexDirection = "row-reverse"), s.appendChild(a), a;
  });
}
function ie(t, r) {
  const { gradient: e, vertical: n, fontSize: o, maskTransition: i } = r;
  return t.map((u) => {
    const c = document.createElement("div");
    return c.style.transition = `clip-path ${i}`, n ? (c.style.height = `calc(100% - ${o * $}px)`, c.style.width = "100%", c.style.backgroundImage = `linear-gradient(to bottom, ${e.join(", ")})`) : (c.style.height = "100%", c.style.width = `calc(100% - ${o * T}px)`, c.style.backgroundImage = `linear-gradient(to left, ${e.join(", ")})`), u.appendChild(c), c;
  });
}
var A = function(t, r) {
  return A = Object.setPrototypeOf || { __proto__: [] } instanceof Array && function(e, n) {
    e.__proto__ = n;
  } || function(e, n) {
    for (var o in n) Object.prototype.hasOwnProperty.call(n, o) && (e[o] = n[o]);
  }, A(t, r);
};
function w(t, r) {
  if (typeof r != "function" && r !== null)
    throw new TypeError("Class extends value " + String(r) + " is not a constructor or null");
  A(t, r);
  function e() {
    this.constructor = t;
  }
  t.prototype = r === null ? Object.create(r) : (e.prototype = r.prototype, new e());
}
function oe(t, r, e, n) {
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      s(i);
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        s(b);
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    a((n = n.apply(t, r || [])).next());
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}
function G(t, r) {
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    return i[1];
  }, trys: [], ops: [] }, n, o, i, s = Object.create((typeof Iterator == "function" ? Iterator : Object).prototype);
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    return this;
  }), s;
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      return c([a, f]);
    };
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    if (n) throw new TypeError("Generator is already executing.");
    for (; s && (s = 0, a[0] && (e = 0)), e; ) try {
      if (n = 1, o && (i = a[0] & 2 ? o.return : a[0] ? o.throw || ((i = o.return) && i.call(o), 0) : o.next) && !(i = i.call(o, a[1])).done) return i;
      switch (o = 0, i && (a = [a[0] & 2, i.value]), a[0]) {
        case 0:
        case 1:
          i = a;
          break;
        case 4:
          return e.label++, { value: a[1], done: !1 };
        case 5:
          e.label++, o = a[1], a = [0];
          continue;
        case 7:
          a = e.ops.pop(), e.trys.pop();
          continue;
        default:
          if (i = e.trys, !(i = i.length > 0 && i[i.length - 1]) && (a[0] === 6 || a[0] === 2)) {
            e = 0;
            continue;
          }
          if (a[0] === 3 && (!i || a[1] > i[0] && a[1] < i[3])) {
            e.label = a[1];
            break;
          }
          if (a[0] === 6 && e.label < i[1]) {
            e.label = i[1], i = a;
            break;
          }
          if (i && e.label < i[2]) {
            e.label = i[2], e.ops.push(a);
            break;
          }
          i[2] && e.ops.pop(), e.trys.pop();
          continue;
      }
      a = r.call(t, e);
    } catch (f) {
      a = [6, f], o = 0;
    } finally {
      n = i = 0;
    }
    if (a[0] & 5) throw a[1];
    return { value: a[0] ? a[1] : void 0, done: !0 };
  }
}
function S(t) {
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  if (e) return e.call(t);
  if (t && typeof t.length == "number") return {
    next: function() {
      return t && n >= t.length && (t = void 0), { value: t && t[n++], done: !t };
    }
  };
  throw new TypeError(r ? "Object is not iterable." : "Symbol.iterator is not defined.");
}
function C(t, r) {
  var e = typeof Symbol == "function" && t[Symbol.iterator];
  if (!e) return t;
  var n = e.call(t), o, i = [], s;
  try {
    for (; (r === void 0 || r-- > 0) && !(o = n.next()).done; ) i.push(o.value);
  } catch (u) {
    s = { error: u };
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      o && !o.done && (e = n.return) && e.call(n);
    } finally {
      if (s) throw s.error;
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  }
  return i;
}
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    (i || !(n in r)) && (i || (i = Array.prototype.slice.call(r, 0, n)), i[n] = r[n]);
  return t.concat(i || Array.prototype.slice.call(r));
}
function g(t) {
  return this instanceof g ? (this.v = t, this) : new g(t);
}
function se(t, r, e) {
  if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
  var n = e.apply(t, r || []), o, i = [];
  return o = Object.create((typeof AsyncIterator == "function" ? AsyncIterator : Object).prototype), u("next"), u("throw"), u("return", s), o[Symbol.asyncIterator] = function() {
    return this;
  }, o;
  function s(l) {
    return function(v) {
      return Promise.resolve(v).then(l, b);
    };
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    n[l] && (o[l] = function(h) {
      return new Promise(function(y, k) {
        i.push([l, h, y, k]) > 1 || c(l, h);
      });
    }, v && (o[l] = v(o[l])));
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    try {
      a(n[l](v));
    } catch (h) {
      d(i[0][3], h);
    }
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  function a(l) {
    l.value instanceof g ? Promise.resolve(l.value.v).then(f, b) : d(i[0][2], l);
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  function f(l) {
    c("next", l);
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  function b(l) {
    c("throw", l);
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    l(v), i.shift(), i.length && c(i[0][0], i[0][1]);
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}
function ae(t) {
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  return r ? r.call(t) : (t = typeof S == "function" ? S(t) : t[Symbol.iterator](), e = {}, n("next"), n("throw"), n("return"), e[Symbol.asyncIterator] = function() {
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    Promise.resolve(c).then(function(a) {
      i({ value: a, done: u });
    }, s);
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}
function p(t) {
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}
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    Error.call(n), n.stack = new Error().stack;
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  return e.prototype = Object.create(Error.prototype), e.prototype.constructor = e, e;
}
var I = V(function(t) {
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    t(this), this.message = e ? e.length + ` errors occurred during unsubscription:
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    var n = this;
    _(function() {
      if (n._throwIfClosed(), !n.isStopped) {
        n.hasError = n.isStopped = !0, n.thrownError = e;
        for (var o = n.observers; o.length; )
          o.shift().error(e);
      }
    });
  }, r.prototype.complete = function() {
    var e = this;
    _(function() {
      if (e._throwIfClosed(), !e.isStopped) {
        e.isStopped = !0;
        for (var n = e.observers; n.length; )
          n.shift().complete();
      }
    });
  }, r.prototype.unsubscribe = function() {
    this.isStopped = this.closed = !0, this.observers = this.currentObservers = null;
  }, Object.defineProperty(r.prototype, "observed", {
    get: function() {
      var e;
      return ((e = this.observers) === null || e === void 0 ? void 0 : e.length) > 0;
    },
    enumerable: !1,
    configurable: !0
  }), r.prototype._trySubscribe = function(e) {
    return this._throwIfClosed(), t.prototype._trySubscribe.call(this, e);
  }, r.prototype._subscribe = function(e) {
    return this._throwIfClosed(), this._checkFinalizedStatuses(e), this._innerSubscribe(e);
  }, r.prototype._innerSubscribe = function(e) {
    var n = this, o = this, i = o.hasError, s = o.isStopped, u = o.observers;
    return i || s ? W : (this.currentObservers = null, u.push(e), new E(function() {
      n.currentObservers = null, R(u, e);
    }));
  }, r.prototype._checkFinalizedStatuses = function(e) {
    var n = this, o = n.hasError, i = n.thrownError, s = n.isStopped;
    o ? e.error(i) : s && e.complete();
  }, r.prototype.asObservable = function() {
    var e = new m();
    return e.source = this, e;
  }, r.create = function(e, n) {
    return new F(e, n);
  }, r;
}(m), F = function(t) {
  w(r, t);
  function r(e, n) {
    var o = t.call(this) || this;
    return o.destination = e, o.source = n, o;
  }
  return r.prototype.next = function(e) {
    var n, o;
    (o = (n = this.destination) === null || n === void 0 ? void 0 : n.next) === null || o === void 0 || o.call(n, e);
  }, r.prototype.error = function(e) {
    var n, o;
    (o = (n = this.destination) === null || n === void 0 ? void 0 : n.error) === null || o === void 0 || o.call(n, e);
  }, r.prototype.complete = function() {
    var e, n;
    (n = (e = this.destination) === null || e === void 0 ? void 0 : e.complete) === null || n === void 0 || n.call(e);
  }, r.prototype._subscribe = function(e) {
    var n, o;
    return (o = (n = this.source) === null || n === void 0 ? void 0 : n.subscribe(e)) !== null && o !== void 0 ? o : W;
  }, r;
}(P), ke = function(t) {
  return t && typeof t.length == "number" && typeof t != "function";
};
function xe(t) {
  return p(t == null ? void 0 : t.then);
}
function _e(t) {
  return p(t[B]);
}
function Pe(t) {
  return Symbol.asyncIterator && p(t == null ? void 0 : t[Symbol.asyncIterator]);
}
function Ee(t) {
  return new TypeError("You provided " + (t !== null && typeof t == "object" ? "an invalid object" : "'" + t + "'") + " where a stream was expected. You can provide an Observable, Promise, ReadableStream, Array, AsyncIterable, or Iterable.");
}
function Oe() {
  return typeof Symbol != "function" || !Symbol.iterator ? "@@iterator" : Symbol.iterator;
}
var Ie = Oe();
function Te(t) {
  return p(t == null ? void 0 : t[Ie]);
}
function $e(t) {
  return se(this, arguments, function() {
    var e, n, o, i;
    return G(this, function(s) {
      switch (s.label) {
        case 0:
          e = t.getReader(), s.label = 1;
        case 1:
          s.trys.push([1, , 9, 10]), s.label = 2;
        case 2:
          return [4, g(e.read())];
        case 3:
          return n = s.sent(), o = n.value, i = n.done, i ? [4, g(void 0)] : [3, 5];
        case 4:
          return [2, s.sent()];
        case 5:
          return [4, g(o)];
        case 6:
          return [4, s.sent()];
        case 7:
          return s.sent(), [3, 2];
        case 8:
          return [3, 10];
        case 9:
          return e.releaseLock(), [7];
        case 10:
          return [2];
      }
    });
  });
}
function Ae(t) {
  return p(t == null ? void 0 : t.getReader);
}
function Ce(t) {
  if (t instanceof m)
    return t;
  if (t != null) {
    if (_e(t))
      return je(t);
    if (ke(t))
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    if (xe(t))
      return Me(t);
    if (Pe(t))
      return K(t);
    if (Te(t))
      return De(t);
    if (Ae(t))
      return ze(t);
  }
  throw Ee(t);
}
function je(t) {
  return new m(function(r) {
    var e = t[B]();
    if (p(e.subscribe))
      return e.subscribe(r);
    throw new TypeError("Provided object does not correctly implement Symbol.observable");
  });
}
function Re(t) {
  return new m(function(r) {
    for (var e = 0; e < t.length && !r.closed; e++)
      r.next(t[e]);
    r.complete();
  });
}
function Me(t) {
  return new m(function(r) {
    t.then(function(e) {
      r.closed || (r.next(e), r.complete());
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      return r.error(e);
    }).then(null, J);
  });
}
function De(t) {
  return new m(function(r) {
    var e, n;
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      for (var o = S(t), i = o.next(); !i.done; i = o.next()) {
        var s = i.value;
        if (r.next(s), r.closed)
          return;
      }
    } catch (u) {
      e = { error: u };
    } finally {
      try {
        i && !i.done && (n = o.return) && n.call(o);
      } finally {
        if (e) throw e.error;
      }
    }
    r.complete();
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}
function K(t) {
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      return r.error(e);
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function ze(t) {
  return K($e(t));
}
function Be(t, r) {
  var e, n, o, i;
  return oe(this, void 0, void 0, function() {
    var s, u;
    return G(this, function(c) {
      switch (c.label) {
        case 0:
          c.trys.push([0, 5, 6, 11]), e = ae(t), c.label = 1;
        case 1:
          return [4, e.next()];
        case 2:
          if (n = c.sent(), !!n.done) return [3, 4];
          if (s = n.value, r.next(s), r.closed)
            return [2];
          c.label = 3;
        case 3:
          return [3, 1];
        case 4:
          return [3, 11];
        case 5:
          return u = c.sent(), o = { error: u }, [3, 11];
        case 6:
          return c.trys.push([6, , 9, 10]), n && !n.done && (i = e.return) ? [4, i.call(e)] : [3, 8];
        case 7:
          c.sent(), c.label = 8;
        case 8:
          return [3, 10];
        case 9:
          if (o) throw o.error;
          return [7];
        case 10:
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        case 11:
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      }
    });
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}
function H(t) {
  return me(function(r, e) {
    Ce(t).subscribe(ge(e, function() {
      return e.complete();
    }, M)), !e.closed && r.subscribe(e);
  });
}
class Ue {
  constructor(r, e, n = {}) {
    this._eventSourceBreaker$ = new P(), this._destroyed$ = new P(), this.channelCount = r, this.config = Object.assign({ ...Q }, n), this.config.scale === "nordic" && (this.config.scaleOffset = 9, this.config.dbTickSize = 3, this.config.dbRangeMin = -46, this.config.dbRangeMax = 3), this.tempPeaks = new Array(this.channelCount).fill(0), this.heldPeaks = new Array(this.channelCount).fill(0), this.peakHoldTimeouts = new Array(this.channelCount).fill(0), e && (this.parent = te(e, this.config), this.channelElements = ne(this.parent, this.config, this.channelCount), this.bars = ie(this.channelElements, this.config), this.ticks = re(this.parent, this.config), this.parent.addEventListener("click", this.clearPeaks.bind(this)), this.paintMeter());
  }
  attachSource(r) {
    return this._eventSourceBreaker$.next(), this._eventSourceBreaker$.complete(), this._eventSourceBreaker$ = new P(), r.subscribe({
      next: (e) => {
        this._eventSource$ = e, this._eventSource$.pipe(H(this._eventSourceBreaker$), H(this._destroyed$)).subscribe({
          next: (n) => {
            this.handlePeakProcessorMessageEvent(n);
          }
        });
      }
    }), this;
  }
  handlePeakProcessorMessageEvent(r) {
    if (r.data.type === "message" && console.log(r.data.message), r.data.type === "peaks") {
      const { peaks: e } = r.data;
      for (let n = 0; n < this.tempPeaks.length; n += 1)
        e.length > n ? this.tempPeaks[n] = e[n] : this.tempPeaks[n] = 0;
      e.length < this.channelCount && this.tempPeaks.fill(0, e.length);
      for (let n = 0; n < e.length; n += 1)
        e[n] > this.heldPeaks[n] && (this.heldPeaks[n] = e[n], this.peakHoldTimeouts[n] && clearTimeout(this.peakHoldTimeouts[n]), this.config.peakHoldDuration && (this.peakHoldTimeouts[n] = window.setTimeout(() => {
          this.clearPeak(n);
        }, this.config.peakHoldDuration)));
    }
  }
  paintMeter() {
    const { dbRangeMin: r, dbRangeMax: e, vertical: n } = this.config;
    this.bars && this.bars.forEach((o, i) => {
      const s = O(this.tempPeaks[i]), u = ee(s, r, e, n);
      o.style.clipPath = u;
    }), this.animationRequestId = window.requestAnimationFrame(this.paintMeter.bind(this));
  }
  clearPeak(r) {
    this.heldPeaks[r] = this.tempPeaks[r];
  }
  clearPeaks() {
    for (let r = 0; r < this.heldPeaks.length; r += 1)
      this.clearPeak(r);
  }
  getPeaks() {
    return {
      current: this.tempPeaks,
      maxes: this.heldPeaks,
      currentDB: this.tempPeaks.map(O),
      maxesDB: this.heldPeaks.map(O)
    };
  }
  destroy() {
    this._eventSourceBreaker$.next(), this._eventSourceBreaker$.complete(), this._destroyed$.next(), this._destroyed$.complete(), this.parent && (this.parent.removeEventListener("click", this.clearPeaks.bind(this)), this.animationRequestId !== void 0 && window.cancelAnimationFrame(this.animationRequestId), this.parent.remove());
  }
}
export {
  Ue as VuMeter,
  Q as defaultConfig
};
//# sourceMappingURL=vu-meter.es.js.map