diff --git "a/lib/wavesurfer.js" "b/lib/wavesurfer.js"
new file mode 100644--- /dev/null
+++ "b/lib/wavesurfer.js"
@@ -0,0 +1,6469 @@
+/*!
+ * wavesurfer.js 5.1.0 (2021-06-20)
+ * https://wavesurfer-js.org
+ * @license BSD-3-Clause
+ */
+(function webpackUniversalModuleDefinition(root, factory) {
+	if(typeof exports === 'object' && typeof module === 'object')
+		module.exports = factory();
+	else if(typeof define === 'function' && define.amd)
+		define("WaveSurfer", [], factory);
+	else if(typeof exports === 'object')
+		exports["WaveSurfer"] = factory();
+	else
+		root["WaveSurfer"] = factory();
+})(this, function() {
+return /******/ (() => { // webpackBootstrap
+/******/ 	var __webpack_modules__ = ({
+
+/***/ "./src/drawer.canvasentry.js":
+/*!***********************************!*\
+  !*** ./src/drawer.canvasentry.js ***!
+  \***********************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var _style = _interopRequireDefault(__webpack_require__(/*! ./util/style */ "./src/util/style.js"));
+
+var _getId = _interopRequireDefault(__webpack_require__(/*! ./util/get-id */ "./src/util/get-id.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+/**
+ * The `CanvasEntry` class represents an element consisting of a wave `canvas`
+ * and an (optional) progress wave `canvas`.
+ *
+ * The `MultiCanvas` renderer uses one or more `CanvasEntry` instances to
+ * render a waveform, depending on the zoom level.
+ */
+var CanvasEntry = /*#__PURE__*/function () {
+  function CanvasEntry() {
+    _classCallCheck(this, CanvasEntry);
+
+    /**
+     * The wave node
+     *
+     * @type {HTMLCanvasElement}
+     */
+    this.wave = null;
+    /**
+     * The wave canvas rendering context
+     *
+     * @type {CanvasRenderingContext2D}
+     */
+
+    this.waveCtx = null;
+    /**
+     * The (optional) progress wave node
+     *
+     * @type {HTMLCanvasElement}
+     */
+
+    this.progress = null;
+    /**
+     * The (optional) progress wave canvas rendering context
+     *
+     * @type {CanvasRenderingContext2D}
+     */
+
+    this.progressCtx = null;
+    /**
+     * Start of the area the canvas should render, between 0 and 1
+     *
+     * @type {number}
+     */
+
+    this.start = 0;
+    /**
+     * End of the area the canvas should render, between 0 and 1
+     *
+     * @type {number}
+     */
+
+    this.end = 1;
+    /**
+     * Unique identifier for this entry
+     *
+     * @type {string}
+     */
+
+    this.id = (0, _getId.default)(typeof this.constructor.name !== 'undefined' ? this.constructor.name.toLowerCase() + '_' : 'canvasentry_');
+    /**
+     * Canvas 2d context attributes
+     *
+     * @type {object}
+     */
+
+    this.canvasContextAttributes = {};
+  }
+  /**
+   * Store the wave canvas element and create the 2D rendering context
+   *
+   * @param {HTMLCanvasElement} element The wave `canvas` element.
+   */
+
+
+  _createClass(CanvasEntry, [{
+    key: "initWave",
+    value: function initWave(element) {
+      this.wave = element;
+      this.waveCtx = this.wave.getContext('2d', this.canvasContextAttributes);
+    }
+    /**
+     * Store the progress wave canvas element and create the 2D rendering
+     * context
+     *
+     * @param {HTMLCanvasElement} element The progress wave `canvas` element.
+     */
+
+  }, {
+    key: "initProgress",
+    value: function initProgress(element) {
+      this.progress = element;
+      this.progressCtx = this.progress.getContext('2d', this.canvasContextAttributes);
+    }
+    /**
+     * Update the dimensions
+     *
+     * @param {number} elementWidth Width of the entry
+     * @param {number} totalWidth Total width of the multi canvas renderer
+     * @param {number} width The new width of the element
+     * @param {number} height The new height of the element
+     */
+
+  }, {
+    key: "updateDimensions",
+    value: function updateDimensions(elementWidth, totalWidth, width, height) {
+      // where the canvas starts and ends in the waveform, represented as a
+      // decimal between 0 and 1
+      this.start = this.wave.offsetLeft / totalWidth || 0;
+      this.end = this.start + elementWidth / totalWidth; // set wave canvas dimensions
+
+      this.wave.width = width;
+      this.wave.height = height;
+      var elementSize = {
+        width: elementWidth + 'px'
+      };
+      (0, _style.default)(this.wave, elementSize);
+
+      if (this.hasProgressCanvas) {
+        // set progress canvas dimensions
+        this.progress.width = width;
+        this.progress.height = height;
+        (0, _style.default)(this.progress, elementSize);
+      }
+    }
+    /**
+     * Clear the wave and progress rendering contexts
+     */
+
+  }, {
+    key: "clearWave",
+    value: function clearWave() {
+      // wave
+      this.waveCtx.clearRect(0, 0, this.waveCtx.canvas.width, this.waveCtx.canvas.height); // progress
+
+      if (this.hasProgressCanvas) {
+        this.progressCtx.clearRect(0, 0, this.progressCtx.canvas.width, this.progressCtx.canvas.height);
+      }
+    }
+    /**
+     * Set the fill styles for wave and progress
+     *
+     * @param {string} waveColor Fill color for the wave canvas
+     * @param {?string} progressColor Fill color for the progress canvas
+     */
+
+  }, {
+    key: "setFillStyles",
+    value: function setFillStyles(waveColor, progressColor) {
+      this.waveCtx.fillStyle = waveColor;
+
+      if (this.hasProgressCanvas) {
+        this.progressCtx.fillStyle = progressColor;
+      }
+    }
+    /**
+     * Set the canvas transforms for wave and progress
+     *
+     * @param {boolean} vertical Whether to render vertically
+     */
+
+  }, {
+    key: "applyCanvasTransforms",
+    value: function applyCanvasTransforms(vertical) {
+      if (vertical) {
+        // Reflect the waveform across the line y = -x
+        this.waveCtx.setTransform(0, 1, 1, 0, 0, 0);
+
+        if (this.hasProgressCanvas) {
+          this.progressCtx.setTransform(0, 1, 1, 0, 0, 0);
+        }
+      }
+    }
+    /**
+     * Draw a rectangle for wave and progress
+     *
+     * @param {number} x X start position
+     * @param {number} y Y start position
+     * @param {number} width Width of the rectangle
+     * @param {number} height Height of the rectangle
+     * @param {number} radius Radius of the rectangle
+     */
+
+  }, {
+    key: "fillRects",
+    value: function fillRects(x, y, width, height, radius) {
+      this.fillRectToContext(this.waveCtx, x, y, width, height, radius);
+
+      if (this.hasProgressCanvas) {
+        this.fillRectToContext(this.progressCtx, x, y, width, height, radius);
+      }
+    }
+    /**
+     * Draw the actual rectangle on a `canvas` element
+     *
+     * @param {CanvasRenderingContext2D} ctx Rendering context of target canvas
+     * @param {number} x X start position
+     * @param {number} y Y start position
+     * @param {number} width Width of the rectangle
+     * @param {number} height Height of the rectangle
+     * @param {number} radius Radius of the rectangle
+     */
+
+  }, {
+    key: "fillRectToContext",
+    value: function fillRectToContext(ctx, x, y, width, height, radius) {
+      if (!ctx) {
+        return;
+      }
+
+      if (radius) {
+        this.drawRoundedRect(ctx, x, y, width, height, radius);
+      } else {
+        ctx.fillRect(x, y, width, height);
+      }
+    }
+    /**
+     * Draw a rounded rectangle on Canvas
+     *
+     * @param {CanvasRenderingContext2D} ctx Canvas context
+     * @param {number} x X-position of the rectangle
+     * @param {number} y Y-position of the rectangle
+     * @param {number} width Width of the rectangle
+     * @param {number} height Height of the rectangle
+     * @param {number} radius Radius of the rectangle
+     *
+     * @return {void}
+     * @example drawRoundedRect(ctx, 50, 50, 5, 10, 3)
+     */
+
+  }, {
+    key: "drawRoundedRect",
+    value: function drawRoundedRect(ctx, x, y, width, height, radius) {
+      if (height === 0) {
+        return;
+      } // peaks are float values from -1 to 1. Use absolute height values in
+      // order to correctly calculate rounded rectangle coordinates
+
+
+      if (height < 0) {
+        height *= -1;
+        y -= height;
+      }
+
+      ctx.beginPath();
+      ctx.moveTo(x + radius, y);
+      ctx.lineTo(x + width - radius, y);
+      ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
+      ctx.lineTo(x + width, y + height - radius);
+      ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
+      ctx.lineTo(x + radius, y + height);
+      ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
+      ctx.lineTo(x, y + radius);
+      ctx.quadraticCurveTo(x, y, x + radius, y);
+      ctx.closePath();
+      ctx.fill();
+    }
+    /**
+     * Render the actual wave and progress lines
+     *
+     * @param {number[]} peaks Array with peaks data
+     * @param {number} absmax Maximum peak value (absolute)
+     * @param {number} halfH Half the height of the waveform
+     * @param {number} offsetY Offset to the top
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that
+     * should be rendered
+     */
+
+  }, {
+    key: "drawLines",
+    value: function drawLines(peaks, absmax, halfH, offsetY, start, end) {
+      this.drawLineToContext(this.waveCtx, peaks, absmax, halfH, offsetY, start, end);
+
+      if (this.hasProgressCanvas) {
+        this.drawLineToContext(this.progressCtx, peaks, absmax, halfH, offsetY, start, end);
+      }
+    }
+    /**
+     * Render the actual waveform line on a `canvas` element
+     *
+     * @param {CanvasRenderingContext2D} ctx Rendering context of target canvas
+     * @param {number[]} peaks Array with peaks data
+     * @param {number} absmax Maximum peak value (absolute)
+     * @param {number} halfH Half the height of the waveform
+     * @param {number} offsetY Offset to the top
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that
+     * should be rendered
+     */
+
+  }, {
+    key: "drawLineToContext",
+    value: function drawLineToContext(ctx, peaks, absmax, halfH, offsetY, start, end) {
+      if (!ctx) {
+        return;
+      }
+
+      var length = peaks.length / 2;
+      var first = Math.round(length * this.start); // use one more peak value to make sure we join peaks at ends -- unless,
+      // of course, this is the last canvas
+
+      var last = Math.round(length * this.end) + 1;
+      var canvasStart = first;
+      var canvasEnd = last;
+      var scale = this.wave.width / (canvasEnd - canvasStart - 1); // optimization
+
+      var halfOffset = halfH + offsetY;
+      var absmaxHalf = absmax / halfH;
+      ctx.beginPath();
+      ctx.moveTo((canvasStart - first) * scale, halfOffset);
+      ctx.lineTo((canvasStart - first) * scale, halfOffset - Math.round((peaks[2 * canvasStart] || 0) / absmaxHalf));
+      var i, peak, h;
+
+      for (i = canvasStart; i < canvasEnd; i++) {
+        peak = peaks[2 * i] || 0;
+        h = Math.round(peak / absmaxHalf);
+        ctx.lineTo((i - first) * scale + this.halfPixel, halfOffset - h);
+      } // draw the bottom edge going backwards, to make a single
+      // closed hull to fill
+
+
+      var j = canvasEnd - 1;
+
+      for (j; j >= canvasStart; j--) {
+        peak = peaks[2 * j + 1] || 0;
+        h = Math.round(peak / absmaxHalf);
+        ctx.lineTo((j - first) * scale + this.halfPixel, halfOffset - h);
+      }
+
+      ctx.lineTo((canvasStart - first) * scale, halfOffset - Math.round((peaks[2 * canvasStart + 1] || 0) / absmaxHalf));
+      ctx.closePath();
+      ctx.fill();
+    }
+    /**
+     * Destroys this entry
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {
+      this.waveCtx = null;
+      this.wave = null;
+      this.progressCtx = null;
+      this.progress = null;
+    }
+    /**
+     * Return image data of the wave `canvas` element
+     *
+     * When using a `type` of `'blob'`, this will return a `Promise` that
+     * resolves with a `Blob` instance.
+     *
+     * @param {string} format='image/png' An optional value of a format type.
+     * @param {number} quality=0.92 An optional value between 0 and 1.
+     * @param {string} type='dataURL' Either 'dataURL' or 'blob'.
+     * @return {string|Promise} When using the default `'dataURL'` `type` this
+     * returns a data URL. When using the `'blob'` `type` this returns a
+     * `Promise` that resolves with a `Blob` instance.
+     */
+
+  }, {
+    key: "getImage",
+    value: function getImage(format, quality, type) {
+      var _this = this;
+
+      if (type === 'blob') {
+        return new Promise(function (resolve) {
+          _this.wave.toBlob(resolve, format, quality);
+        });
+      } else if (type === 'dataURL') {
+        return this.wave.toDataURL(format, quality);
+      }
+    }
+  }]);
+
+  return CanvasEntry;
+}();
+
+exports.default = CanvasEntry;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/drawer.js":
+/*!***********************!*\
+  !*** ./src/drawer.js ***!
+  \***********************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+/**
+ * Parent class for renderers
+ *
+ * @extends {Observer}
+ */
+var Drawer = /*#__PURE__*/function (_util$Observer) {
+  _inherits(Drawer, _util$Observer);
+
+  var _super = _createSuper(Drawer);
+
+  /**
+   * @param {HTMLElement} container The container node of the wavesurfer instance
+   * @param {WavesurferParams} params The wavesurfer initialisation options
+   */
+  function Drawer(container, params) {
+    var _this;
+
+    _classCallCheck(this, Drawer);
+
+    _this = _super.call(this);
+    _this.container = util.withOrientation(container, params.vertical);
+    /**
+     * @type {WavesurferParams}
+     */
+
+    _this.params = params;
+    /**
+     * The width of the renderer
+     * @type {number}
+     */
+
+    _this.width = 0;
+    /**
+     * The height of the renderer
+     * @type {number}
+     */
+
+    _this.height = params.height * _this.params.pixelRatio;
+    _this.lastPos = 0;
+    /**
+     * The `<wave>` element which is added to the container
+     * @type {HTMLElement}
+     */
+
+    _this.wrapper = null;
+    return _this;
+  }
+  /**
+   * Alias of `util.style`
+   *
+   * @param {HTMLElement} el The element that the styles will be applied to
+   * @param {Object} styles The map of propName: attribute, both are used as-is
+   * @return {HTMLElement} el
+   */
+
+
+  _createClass(Drawer, [{
+    key: "style",
+    value: function style(el, styles) {
+      return util.style(el, styles);
+    }
+    /**
+     * Create the wrapper `<wave>` element, style it and set up the events for
+     * interaction
+     */
+
+  }, {
+    key: "createWrapper",
+    value: function createWrapper() {
+      this.wrapper = util.withOrientation(this.container.appendChild(document.createElement('wave')), this.params.vertical);
+      this.style(this.wrapper, {
+        display: 'block',
+        position: 'relative',
+        userSelect: 'none',
+        webkitUserSelect: 'none',
+        height: this.params.height + 'px'
+      });
+
+      if (this.params.fillParent || this.params.scrollParent) {
+        this.style(this.wrapper, {
+          width: '100%',
+          overflowX: this.params.hideScrollbar ? 'hidden' : 'auto',
+          overflowY: 'hidden'
+        });
+      }
+
+      this.setupWrapperEvents();
+    }
+    /**
+     * Handle click event
+     *
+     * @param {Event} e Click event
+     * @param {?boolean} noPrevent Set to true to not call `e.preventDefault()`
+     * @return {number} Playback position from 0 to 1
+     */
+
+  }, {
+    key: "handleEvent",
+    value: function handleEvent(e, noPrevent) {
+      !noPrevent && e.preventDefault();
+      var clientX = util.withOrientation(e.targetTouches ? e.targetTouches[0] : e, this.params.vertical).clientX;
+      var bbox = this.wrapper.getBoundingClientRect();
+      var nominalWidth = this.width;
+      var parentWidth = this.getWidth();
+      var progressPixels = this.getProgressPixels(bbox, clientX);
+      var progress;
+
+      if (!this.params.fillParent && nominalWidth < parentWidth) {
+        progress = progressPixels * (this.params.pixelRatio / nominalWidth) || 0;
+      } else {
+        progress = (progressPixels + this.wrapper.scrollLeft) / this.wrapper.scrollWidth || 0;
+      }
+
+      return util.clamp(progress, 0, 1);
+    }
+  }, {
+    key: "getProgressPixels",
+    value: function getProgressPixels(wrapperBbox, clientX) {
+      if (this.params.rtl) {
+        return wrapperBbox.right - clientX;
+      } else {
+        return clientX - wrapperBbox.left;
+      }
+    }
+  }, {
+    key: "setupWrapperEvents",
+    value: function setupWrapperEvents() {
+      var _this2 = this;
+
+      this.wrapper.addEventListener('click', function (e) {
+        var orientedEvent = util.withOrientation(e, _this2.params.vertical);
+        var scrollbarHeight = _this2.wrapper.offsetHeight - _this2.wrapper.clientHeight;
+
+        if (scrollbarHeight !== 0) {
+          // scrollbar is visible.  Check if click was on it
+          var bbox = _this2.wrapper.getBoundingClientRect();
+
+          if (orientedEvent.clientY >= bbox.bottom - scrollbarHeight) {
+            // ignore mousedown as it was on the scrollbar
+            return;
+          }
+        }
+
+        if (_this2.params.interact) {
+          _this2.fireEvent('click', e, _this2.handleEvent(e));
+        }
+      });
+      this.wrapper.addEventListener('dblclick', function (e) {
+        if (_this2.params.interact) {
+          _this2.fireEvent('dblclick', e, _this2.handleEvent(e));
+        }
+      });
+      this.wrapper.addEventListener('scroll', function (e) {
+        return _this2.fireEvent('scroll', e);
+      });
+    }
+    /**
+     * Draw peaks on the canvas
+     *
+     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays
+     * for split channel rendering
+     * @param {number} length The width of the area that should be drawn
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that should be
+     * rendered
+     */
+
+  }, {
+    key: "drawPeaks",
+    value: function drawPeaks(peaks, length, start, end) {
+      if (!this.setWidth(length)) {
+        this.clearWave();
+      }
+
+      this.params.barWidth ? this.drawBars(peaks, 0, start, end) : this.drawWave(peaks, 0, start, end);
+    }
+    /**
+     * Scroll to the beginning
+     */
+
+  }, {
+    key: "resetScroll",
+    value: function resetScroll() {
+      if (this.wrapper !== null) {
+        this.wrapper.scrollLeft = 0;
+      }
+    }
+    /**
+     * Recenter the view-port at a certain percent of the waveform
+     *
+     * @param {number} percent Value from 0 to 1 on the waveform
+     */
+
+  }, {
+    key: "recenter",
+    value: function recenter(percent) {
+      var position = this.wrapper.scrollWidth * percent;
+      this.recenterOnPosition(position, true);
+    }
+    /**
+     * Recenter the view-port on a position, either scroll there immediately or
+     * in steps of 5 pixels
+     *
+     * @param {number} position X-offset in pixels
+     * @param {boolean} immediate Set to true to immediately scroll somewhere
+     */
+
+  }, {
+    key: "recenterOnPosition",
+    value: function recenterOnPosition(position, immediate) {
+      var scrollLeft = this.wrapper.scrollLeft;
+      var half = ~~(this.wrapper.clientWidth / 2);
+      var maxScroll = this.wrapper.scrollWidth - this.wrapper.clientWidth;
+      var target = position - half;
+      var offset = target - scrollLeft;
+
+      if (maxScroll == 0) {
+        // no need to continue if scrollbar is not there
+        return;
+      } // if the cursor is currently visible...
+
+
+      if (!immediate && -half <= offset && offset < half) {
+        // set rate at which waveform is centered
+        var rate = this.params.autoCenterRate; // make rate depend on width of view and length of waveform
+
+        rate /= half;
+        rate *= maxScroll;
+        offset = Math.max(-rate, Math.min(rate, offset));
+        target = scrollLeft + offset;
+      } // limit target to valid range (0 to maxScroll)
+
+
+      target = Math.max(0, Math.min(maxScroll, target)); // no use attempting to scroll if we're not moving
+
+      if (target != scrollLeft) {
+        this.wrapper.scrollLeft = target;
+      }
+    }
+    /**
+     * Get the current scroll position in pixels
+     *
+     * @return {number} Horizontal scroll position in pixels
+     */
+
+  }, {
+    key: "getScrollX",
+    value: function getScrollX() {
+      var x = 0;
+
+      if (this.wrapper) {
+        var pixelRatio = this.params.pixelRatio;
+        x = Math.round(this.wrapper.scrollLeft * pixelRatio); // In cases of elastic scroll (safari with mouse wheel) you can
+        // scroll beyond the limits of the container
+        // Calculate and floor the scrollable extent to make sure an out
+        // of bounds value is not returned
+        // Ticket #1312
+
+        if (this.params.scrollParent) {
+          var maxScroll = ~~(this.wrapper.scrollWidth * pixelRatio - this.getWidth());
+          x = Math.min(maxScroll, Math.max(0, x));
+        }
+      }
+
+      return x;
+    }
+    /**
+     * Get the width of the container
+     *
+     * @return {number} The width of the container
+     */
+
+  }, {
+    key: "getWidth",
+    value: function getWidth() {
+      return Math.round(this.container.clientWidth * this.params.pixelRatio);
+    }
+    /**
+     * Set the width of the container
+     *
+     * @param {number} width The new width of the container
+     * @return {boolean} Whether the width of the container was updated or not
+     */
+
+  }, {
+    key: "setWidth",
+    value: function setWidth(width) {
+      if (this.width == width) {
+        return false;
+      }
+
+      this.width = width;
+
+      if (this.params.fillParent || this.params.scrollParent) {
+        this.style(this.wrapper, {
+          width: ''
+        });
+      } else {
+        var newWidth = ~~(this.width / this.params.pixelRatio) + 'px';
+        this.style(this.wrapper, {
+          width: newWidth
+        });
+      }
+
+      this.updateSize();
+      return true;
+    }
+    /**
+     * Set the height of the container
+     *
+     * @param {number} height The new height of the container.
+     * @return {boolean} Whether the height of the container was updated or not
+     */
+
+  }, {
+    key: "setHeight",
+    value: function setHeight(height) {
+      if (height == this.height) {
+        return false;
+      }
+
+      this.height = height;
+      this.style(this.wrapper, {
+        height: ~~(this.height / this.params.pixelRatio) + 'px'
+      });
+      this.updateSize();
+      return true;
+    }
+    /**
+     * Called by wavesurfer when progress should be rendered
+     *
+     * @param {number} progress From 0 to 1
+     */
+
+  }, {
+    key: "progress",
+    value: function progress(_progress) {
+      var minPxDelta = 1 / this.params.pixelRatio;
+      var pos = Math.round(_progress * this.width) * minPxDelta;
+
+      if (pos < this.lastPos || pos - this.lastPos >= minPxDelta) {
+        this.lastPos = pos;
+
+        if (this.params.scrollParent && this.params.autoCenter) {
+          var newPos = ~~(this.wrapper.scrollWidth * _progress);
+          this.recenterOnPosition(newPos, this.params.autoCenterImmediately);
+        }
+
+        this.updateProgress(pos);
+      }
+    }
+    /**
+     * This is called when wavesurfer is destroyed
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {
+      this.unAll();
+
+      if (this.wrapper) {
+        if (this.wrapper.parentNode == this.container.domElement) {
+          this.container.removeChild(this.wrapper.domElement);
+        }
+
+        this.wrapper = null;
+      }
+    }
+    /* Renderer-specific methods */
+
+    /**
+     * Called after cursor related params have changed.
+     *
+     * @abstract
+     */
+
+  }, {
+    key: "updateCursor",
+    value: function updateCursor() {}
+    /**
+     * Called when the size of the container changes so the renderer can adjust
+     *
+     * @abstract
+     */
+
+  }, {
+    key: "updateSize",
+    value: function updateSize() {}
+    /**
+     * Draw a waveform with bars
+     *
+     * @abstract
+     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays for split channel
+     * rendering
+     * @param {number} channelIndex The index of the current channel. Normally
+     * should be 0
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that should be
+     * rendered
+     */
+
+  }, {
+    key: "drawBars",
+    value: function drawBars(peaks, channelIndex, start, end) {}
+    /**
+     * Draw a waveform
+     *
+     * @abstract
+     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays for split channel
+     * rendering
+     * @param {number} channelIndex The index of the current channel. Normally
+     * should be 0
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that should be
+     * rendered
+     */
+
+  }, {
+    key: "drawWave",
+    value: function drawWave(peaks, channelIndex, start, end) {}
+    /**
+     * Clear the waveform
+     *
+     * @abstract
+     */
+
+  }, {
+    key: "clearWave",
+    value: function clearWave() {}
+    /**
+     * Render the new progress
+     *
+     * @abstract
+     * @param {number} position X-Offset of progress position in pixels
+     */
+
+  }, {
+    key: "updateProgress",
+    value: function updateProgress(position) {}
+  }]);
+
+  return Drawer;
+}(util.Observer);
+
+exports.default = Drawer;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/drawer.multicanvas.js":
+/*!***********************************!*\
+  !*** ./src/drawer.multicanvas.js ***!
+  \***********************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var _drawer = _interopRequireDefault(__webpack_require__(/*! ./drawer */ "./src/drawer.js"));
+
+var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
+
+var _drawer2 = _interopRequireDefault(__webpack_require__(/*! ./drawer.canvasentry */ "./src/drawer.canvasentry.js"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+/**
+ * MultiCanvas renderer for wavesurfer. Is currently the default and sole
+ * builtin renderer.
+ *
+ * A `MultiCanvas` consists of one or more `CanvasEntry` instances, depending
+ * on the zoom level.
+ */
+var MultiCanvas = /*#__PURE__*/function (_Drawer) {
+  _inherits(MultiCanvas, _Drawer);
+
+  var _super = _createSuper(MultiCanvas);
+
+  /**
+   * @param {HTMLElement} container The container node of the wavesurfer instance
+   * @param {WavesurferParams} params The wavesurfer initialisation options
+   */
+  function MultiCanvas(container, params) {
+    var _this;
+
+    _classCallCheck(this, MultiCanvas);
+
+    _this = _super.call(this, container, params);
+    /**
+     * @type {number}
+     */
+
+    _this.maxCanvasWidth = params.maxCanvasWidth;
+    /**
+     * @type {number}
+     */
+
+    _this.maxCanvasElementWidth = Math.round(params.maxCanvasWidth / params.pixelRatio);
+    /**
+     * Whether or not the progress wave is rendered. If the `waveColor`
+     * and `progressColor` are the same color it is not.
+     *
+     * @type {boolean}
+     */
+
+    _this.hasProgressCanvas = params.waveColor != params.progressColor;
+    /**
+     * @type {number}
+     */
+
+    _this.halfPixel = 0.5 / params.pixelRatio;
+    /**
+     * List of `CanvasEntry` instances.
+     *
+     * @type {Array}
+     */
+
+    _this.canvases = [];
+    /**
+     * @type {HTMLElement}
+     */
+
+    _this.progressWave = null;
+    /**
+     * Class used to generate entries.
+     *
+     * @type {function}
+     */
+
+    _this.EntryClass = _drawer2.default;
+    /**
+     * Canvas 2d context attributes.
+     *
+     * @type {object}
+     */
+
+    _this.canvasContextAttributes = params.drawingContextAttributes;
+    /**
+     * Overlap added between entries to prevent vertical white stripes
+     * between `canvas` elements.
+     *
+     * @type {number}
+     */
+
+    _this.overlap = 2 * Math.ceil(params.pixelRatio / 2);
+    /**
+     * The radius of the wave bars. Makes bars rounded
+     *
+     * @type {number}
+     */
+
+    _this.barRadius = params.barRadius || 0;
+    /**
+     * Whether to render the waveform vertically. Defaults to false.
+     *
+     * @type {boolean}
+     */
+
+    _this.vertical = params.vertical;
+    return _this;
+  }
+  /**
+   * Initialize the drawer
+   */
+
+
+  _createClass(MultiCanvas, [{
+    key: "init",
+    value: function init() {
+      this.createWrapper();
+      this.createElements();
+    }
+    /**
+     * Create the canvas elements and style them
+     *
+     */
+
+  }, {
+    key: "createElements",
+    value: function createElements() {
+      this.progressWave = util.withOrientation(this.wrapper.appendChild(document.createElement('wave')), this.params.vertical);
+      this.style(this.progressWave, {
+        position: 'absolute',
+        zIndex: 3,
+        left: 0,
+        top: 0,
+        bottom: 0,
+        overflow: 'hidden',
+        width: '0',
+        display: 'none',
+        boxSizing: 'border-box',
+        borderRightStyle: 'solid',
+        pointerEvents: 'none'
+      });
+      this.addCanvas();
+      this.updateCursor();
+    }
+    /**
+     * Update cursor style
+     */
+
+  }, {
+    key: "updateCursor",
+    value: function updateCursor() {
+      this.style(this.progressWave, {
+        borderRightWidth: this.params.cursorWidth + 'px',
+        borderRightColor: this.params.cursorColor
+      });
+    }
+    /**
+     * Adjust to the updated size by adding or removing canvases
+     */
+
+  }, {
+    key: "updateSize",
+    value: function updateSize() {
+      var _this2 = this;
+
+      var totalWidth = Math.round(this.width / this.params.pixelRatio);
+      var requiredCanvases = Math.ceil(totalWidth / (this.maxCanvasElementWidth + this.overlap)); // add required canvases
+
+      while (this.canvases.length < requiredCanvases) {
+        this.addCanvas();
+      } // remove older existing canvases, if any
+
+
+      while (this.canvases.length > requiredCanvases) {
+        this.removeCanvas();
+      }
+
+      var canvasWidth = this.maxCanvasWidth + this.overlap;
+      var lastCanvas = this.canvases.length - 1;
+      this.canvases.forEach(function (entry, i) {
+        if (i == lastCanvas) {
+          canvasWidth = _this2.width - _this2.maxCanvasWidth * lastCanvas;
+        }
+
+        _this2.updateDimensions(entry, canvasWidth, _this2.height);
+
+        entry.clearWave();
+      });
+    }
+    /**
+     * Add a canvas to the canvas list
+     *
+     */
+
+  }, {
+    key: "addCanvas",
+    value: function addCanvas() {
+      var entry = new this.EntryClass();
+      entry.canvasContextAttributes = this.canvasContextAttributes;
+      entry.hasProgressCanvas = this.hasProgressCanvas;
+      entry.halfPixel = this.halfPixel;
+      var leftOffset = this.maxCanvasElementWidth * this.canvases.length; // wave
+
+      var wave = util.withOrientation(this.wrapper.appendChild(document.createElement('canvas')), this.params.vertical);
+      this.style(wave, {
+        position: 'absolute',
+        zIndex: 2,
+        left: leftOffset + 'px',
+        top: 0,
+        bottom: 0,
+        height: '100%',
+        pointerEvents: 'none'
+      });
+      entry.initWave(wave); // progress
+
+      if (this.hasProgressCanvas) {
+        var progress = util.withOrientation(this.progressWave.appendChild(document.createElement('canvas')), this.params.vertical);
+        this.style(progress, {
+          position: 'absolute',
+          left: leftOffset + 'px',
+          top: 0,
+          bottom: 0,
+          height: '100%'
+        });
+        entry.initProgress(progress);
+      }
+
+      this.canvases.push(entry);
+    }
+    /**
+     * Pop single canvas from the list
+     *
+     */
+
+  }, {
+    key: "removeCanvas",
+    value: function removeCanvas() {
+      var lastEntry = this.canvases[this.canvases.length - 1]; // wave
+
+      lastEntry.wave.parentElement.removeChild(lastEntry.wave.domElement); // progress
+
+      if (this.hasProgressCanvas) {
+        lastEntry.progress.parentElement.removeChild(lastEntry.progress.domElement);
+      } // cleanup
+
+
+      if (lastEntry) {
+        lastEntry.destroy();
+        lastEntry = null;
+      }
+
+      this.canvases.pop();
+    }
+    /**
+     * Update the dimensions of a canvas element
+     *
+     * @param {CanvasEntry} entry Target entry
+     * @param {number} width The new width of the element
+     * @param {number} height The new height of the element
+     */
+
+  }, {
+    key: "updateDimensions",
+    value: function updateDimensions(entry, width, height) {
+      var elementWidth = Math.round(width / this.params.pixelRatio);
+      var totalWidth = Math.round(this.width / this.params.pixelRatio); // update canvas dimensions
+
+      entry.updateDimensions(elementWidth, totalWidth, width, height); // style element
+
+      this.style(this.progressWave, {
+        display: 'block'
+      });
+    }
+    /**
+     * Clear the whole multi-canvas
+     */
+
+  }, {
+    key: "clearWave",
+    value: function clearWave() {
+      var _this3 = this;
+
+      util.frame(function () {
+        _this3.canvases.forEach(function (entry) {
+          return entry.clearWave();
+        });
+      })();
+    }
+    /**
+     * Draw a waveform with bars
+     *
+     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays
+     * for split channel rendering
+     * @param {number} channelIndex The index of the current channel. Normally
+     * should be 0. Must be an integer.
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that should be
+     * rendered
+     * @returns {void}
+     */
+
+  }, {
+    key: "drawBars",
+    value: function drawBars(peaks, channelIndex, start, end) {
+      var _this4 = this;
+
+      return this.prepareDraw(peaks, channelIndex, start, end, function (_ref) {
+        var absmax = _ref.absmax,
+            hasMinVals = _ref.hasMinVals,
+            height = _ref.height,
+            offsetY = _ref.offsetY,
+            halfH = _ref.halfH,
+            peaks = _ref.peaks,
+            ch = _ref.channelIndex;
+
+        // if drawBars was called within ws.empty we don't pass a start and
+        // don't want anything to happen
+        if (start === undefined) {
+          return;
+        } // Skip every other value if there are negatives.
+
+
+        var peakIndexScale = hasMinVals ? 2 : 1;
+        var length = peaks.length / peakIndexScale;
+        var bar = _this4.params.barWidth * _this4.params.pixelRatio;
+        var gap = _this4.params.barGap === null ? Math.max(_this4.params.pixelRatio, ~~(bar / 2)) : Math.max(_this4.params.pixelRatio, _this4.params.barGap * _this4.params.pixelRatio);
+        var step = bar + gap;
+        var scale = length / _this4.width;
+        var first = start;
+        var last = end;
+        var i = first;
+
+        for (i; i < last; i += step) {
+          var peak = peaks[Math.floor(i * scale * peakIndexScale)] || 0;
+          var h = Math.round(peak / absmax * halfH);
+          /* in case of silences, allow the user to specify that we
+           * always draw *something* (normally a 1px high bar) */
+
+          if (h == 0 && _this4.params.barMinHeight) {
+            h = _this4.params.barMinHeight;
+          }
+
+          _this4.fillRect(i + _this4.halfPixel, halfH - h + offsetY, bar + _this4.halfPixel, h * 2, _this4.barRadius, ch);
+        }
+      });
+    }
+    /**
+     * Draw a waveform
+     *
+     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays
+     * for split channel rendering
+     * @param {number} channelIndex The index of the current channel. Normally
+     * should be 0
+     * @param {number?} start The x-offset of the beginning of the area that
+     * should be rendered (If this isn't set only a flat line is rendered)
+     * @param {number?} end The x-offset of the end of the area that should be
+     * rendered
+     * @returns {void}
+     */
+
+  }, {
+    key: "drawWave",
+    value: function drawWave(peaks, channelIndex, start, end) {
+      var _this5 = this;
+
+      return this.prepareDraw(peaks, channelIndex, start, end, function (_ref2) {
+        var absmax = _ref2.absmax,
+            hasMinVals = _ref2.hasMinVals,
+            height = _ref2.height,
+            offsetY = _ref2.offsetY,
+            halfH = _ref2.halfH,
+            peaks = _ref2.peaks,
+            channelIndex = _ref2.channelIndex;
+
+        if (!hasMinVals) {
+          var reflectedPeaks = [];
+          var len = peaks.length;
+          var i = 0;
+
+          for (i; i < len; i++) {
+            reflectedPeaks[2 * i] = peaks[i];
+            reflectedPeaks[2 * i + 1] = -peaks[i];
+          }
+
+          peaks = reflectedPeaks;
+        } // if drawWave was called within ws.empty we don't pass a start and
+        // end and simply want a flat line
+
+
+        if (start !== undefined) {
+          _this5.drawLine(peaks, absmax, halfH, offsetY, start, end, channelIndex);
+        } // always draw a median line
+
+
+        _this5.fillRect(0, halfH + offsetY - _this5.halfPixel, _this5.width, _this5.halfPixel, _this5.barRadius, channelIndex);
+      });
+    }
+    /**
+     * Tell the canvas entries to render their portion of the waveform
+     *
+     * @param {number[]} peaks Peaks data
+     * @param {number} absmax Maximum peak value (absolute)
+     * @param {number} halfH Half the height of the waveform
+     * @param {number} offsetY Offset to the top
+     * @param {number} start The x-offset of the beginning of the area that
+     * should be rendered
+     * @param {number} end The x-offset of the end of the area that
+     * should be rendered
+     * @param {channelIndex} channelIndex The channel index of the line drawn
+     */
+
+  }, {
+    key: "drawLine",
+    value: function drawLine(peaks, absmax, halfH, offsetY, start, end, channelIndex) {
+      var _this6 = this;
+
+      var _ref3 = this.params.splitChannelsOptions.channelColors[channelIndex] || {},
+          waveColor = _ref3.waveColor,
+          progressColor = _ref3.progressColor;
+
+      this.canvases.forEach(function (entry, i) {
+        _this6.setFillStyles(entry, waveColor, progressColor);
+
+        _this6.applyCanvasTransforms(entry, _this6.params.vertical);
+
+        entry.drawLines(peaks, absmax, halfH, offsetY, start, end);
+      });
+    }
+    /**
+     * Draw a rectangle on the multi-canvas
+     *
+     * @param {number} x X-position of the rectangle
+     * @param {number} y Y-position of the rectangle
+     * @param {number} width Width of the rectangle
+     * @param {number} height Height of the rectangle
+     * @param {number} radius Radius of the rectangle
+     * @param {channelIndex} channelIndex The channel index of the bar drawn
+     */
+
+  }, {
+    key: "fillRect",
+    value: function fillRect(x, y, width, height, radius, channelIndex) {
+      var startCanvas = Math.floor(x / this.maxCanvasWidth);
+      var endCanvas = Math.min(Math.ceil((x + width) / this.maxCanvasWidth) + 1, this.canvases.length);
+      var i = startCanvas;
+
+      for (i; i < endCanvas; i++) {
+        var entry = this.canvases[i];
+        var leftOffset = i * this.maxCanvasWidth;
+        var intersection = {
+          x1: Math.max(x, i * this.maxCanvasWidth),
+          y1: y,
+          x2: Math.min(x + width, i * this.maxCanvasWidth + entry.wave.width),
+          y2: y + height
+        };
+
+        if (intersection.x1 < intersection.x2) {
+          var _ref4 = this.params.splitChannelsOptions.channelColors[channelIndex] || {},
+              waveColor = _ref4.waveColor,
+              progressColor = _ref4.progressColor;
+
+          this.setFillStyles(entry, waveColor, progressColor);
+          this.applyCanvasTransforms(entry, this.params.vertical);
+          entry.fillRects(intersection.x1 - leftOffset, intersection.y1, intersection.x2 - intersection.x1, intersection.y2 - intersection.y1, radius);
+        }
+      }
+    }
+    /**
+     * Returns whether to hide the channel from being drawn based on params.
+     *
+     * @param {number} channelIndex The index of the current channel.
+     * @returns {bool} True to hide the channel, false to draw.
+     */
+
+  }, {
+    key: "hideChannel",
+    value: function hideChannel(channelIndex) {
+      return this.params.splitChannels && this.params.splitChannelsOptions.filterChannels.includes(channelIndex);
+    }
+    /**
+     * Performs preparation tasks and calculations which are shared by `drawBars`
+     * and `drawWave`
+     *
+     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays for
+     * split channel rendering
+     * @param {number} channelIndex The index of the current channel. Normally
+     * should be 0
+     * @param {number?} start The x-offset of the beginning of the area that
+     * should be rendered. If this isn't set only a flat line is rendered
+     * @param {number?} end The x-offset of the end of the area that should be
+     * rendered
+     * @param {function} fn The render function to call, e.g. `drawWave`
+     * @param {number} drawIndex The index of the current channel after filtering.
+     * @param {number?} normalizedMax Maximum modulation value across channels for use with relativeNormalization. Ignored when undefined
+     * @returns {void}
+     */
+
+  }, {
+    key: "prepareDraw",
+    value: function prepareDraw(peaks, channelIndex, start, end, fn, drawIndex, normalizedMax) {
+      var _this7 = this;
+
+      return util.frame(function () {
+        // Split channels and call this function with the channelIndex set
+        if (peaks[0] instanceof Array) {
+          var channels = peaks;
+
+          if (_this7.params.splitChannels) {
+            var filteredChannels = channels.filter(function (c, i) {
+              return !_this7.hideChannel(i);
+            });
+
+            if (!_this7.params.splitChannelsOptions.overlay) {
+              _this7.setHeight(Math.max(filteredChannels.length, 1) * _this7.params.height * _this7.params.pixelRatio);
+            }
+
+            var overallAbsMax;
+
+            if (_this7.params.splitChannelsOptions && _this7.params.splitChannelsOptions.relativeNormalization) {
+              // calculate maximum peak across channels to use for normalization
+              overallAbsMax = util.max(channels.map(function (channelPeaks) {
+                return util.absMax(channelPeaks);
+              }));
+            }
+
+            return channels.forEach(function (channelPeaks, i) {
+              return _this7.prepareDraw(channelPeaks, i, start, end, fn, filteredChannels.indexOf(channelPeaks), overallAbsMax);
+            });
+          }
+
+          peaks = channels[0];
+        } // Return and do not draw channel peaks if hidden.
+
+
+        if (_this7.hideChannel(channelIndex)) {
+          return;
+        } // calculate maximum modulation value, either from the barHeight
+        // parameter or if normalize=true from the largest value in the peak
+        // set
+
+
+        var absmax = 1 / _this7.params.barHeight;
+
+        if (_this7.params.normalize) {
+          absmax = normalizedMax === undefined ? util.absMax(peaks) : normalizedMax;
+        } // Bar wave draws the bottom only as a reflection of the top,
+        // so we don't need negative values
+
+
+        var hasMinVals = [].some.call(peaks, function (val) {
+          return val < 0;
+        });
+        var height = _this7.params.height * _this7.params.pixelRatio;
+        var halfH = height / 2;
+        var offsetY = height * drawIndex || 0; // Override offsetY if overlay is true
+
+        if (_this7.params.splitChannelsOptions && _this7.params.splitChannelsOptions.overlay) {
+          offsetY = 0;
+        }
+
+        return fn({
+          absmax: absmax,
+          hasMinVals: hasMinVals,
+          height: height,
+          offsetY: offsetY,
+          halfH: halfH,
+          peaks: peaks,
+          channelIndex: channelIndex
+        });
+      })();
+    }
+    /**
+     * Set the fill styles for a certain entry (wave and progress)
+     *
+     * @param {CanvasEntry} entry Target entry
+     * @param {string} waveColor Wave color to draw this entry
+     * @param {string} progressColor Progress color to draw this entry
+     */
+
+  }, {
+    key: "setFillStyles",
+    value: function setFillStyles(entry) {
+      var waveColor = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : this.params.waveColor;
+      var progressColor = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : this.params.progressColor;
+      entry.setFillStyles(waveColor, progressColor);
+    }
+    /**
+     * Set the canvas transforms for a certain entry (wave and progress)
+     *
+     * @param {CanvasEntry} entry Target entry
+     * @param {boolean} vertical Whether to render the waveform vertically
+     */
+
+  }, {
+    key: "applyCanvasTransforms",
+    value: function applyCanvasTransforms(entry) {
+      var vertical = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
+      entry.applyCanvasTransforms(vertical);
+    }
+    /**
+     * Return image data of the multi-canvas
+     *
+     * When using a `type` of `'blob'`, this will return a `Promise`.
+     *
+     * @param {string} format='image/png' An optional value of a format type.
+     * @param {number} quality=0.92 An optional value between 0 and 1.
+     * @param {string} type='dataURL' Either 'dataURL' or 'blob'.
+     * @return {string|string[]|Promise} When using the default `'dataURL'`
+     * `type` this returns a single data URL or an array of data URLs,
+     * one for each canvas. When using the `'blob'` `type` this returns a
+     * `Promise` that resolves with an array of `Blob` instances, one for each
+     * canvas.
+     */
+
+  }, {
+    key: "getImage",
+    value: function getImage(format, quality, type) {
+      if (type === 'blob') {
+        return Promise.all(this.canvases.map(function (entry) {
+          return entry.getImage(format, quality, type);
+        }));
+      } else if (type === 'dataURL') {
+        var images = this.canvases.map(function (entry) {
+          return entry.getImage(format, quality, type);
+        });
+        return images.length > 1 ? images : images[0];
+      }
+    }
+    /**
+     * Render the new progress
+     *
+     * @param {number} position X-offset of progress position in pixels
+     */
+
+  }, {
+    key: "updateProgress",
+    value: function updateProgress(position) {
+      this.style(this.progressWave, {
+        width: position + 'px'
+      });
+    }
+  }]);
+
+  return MultiCanvas;
+}(_drawer.default);
+
+exports.default = MultiCanvas;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/mediaelement-webaudio.js":
+/*!**************************************!*\
+  !*** ./src/mediaelement-webaudio.js ***!
+  \**************************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var _mediaelement = _interopRequireDefault(__webpack_require__(/*! ./mediaelement */ "./src/mediaelement.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }
+
+function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+/**
+ * MediaElementWebAudio backend: load audio via an HTML5 audio tag, but playback with the WebAudio API.
+ * The advantage here is that the html5 <audio> tag can perform range requests on the server and not
+ * buffer the entire file in one request, and you still get the filtering and scripting functionality
+ * of the webaudio API.
+ * Note that in order to use range requests and prevent buffering, you must provide peak data.
+ *
+ * @since 3.2.0
+ */
+var MediaElementWebAudio = /*#__PURE__*/function (_MediaElement) {
+  _inherits(MediaElementWebAudio, _MediaElement);
+
+  var _super = _createSuper(MediaElementWebAudio);
+
+  /**
+   * Construct the backend
+   *
+   * @param {WavesurferParams} params Wavesurfer parameters
+   */
+  function MediaElementWebAudio(params) {
+    var _this;
+
+    _classCallCheck(this, MediaElementWebAudio);
+
+    _this = _super.call(this, params);
+    /** @private */
+
+    _this.params = params;
+    /** @private */
+
+    _this.sourceMediaElement = null;
+    return _this;
+  }
+  /**
+   * Initialise the backend, called in `wavesurfer.createBackend()`
+   */
+
+
+  _createClass(MediaElementWebAudio, [{
+    key: "init",
+    value: function init() {
+      this.setPlaybackRate(this.params.audioRate);
+      this.createTimer();
+      this.createVolumeNode();
+      this.createScriptNode();
+      this.createAnalyserNode();
+    }
+    /**
+     * Private method called by both `load` (from url)
+     * and `loadElt` (existing media element) methods.
+     *
+     * @param {HTMLMediaElement} media HTML5 Audio or Video element
+     * @param {number[]|Number.<Array[]>} peaks Array of peak data
+     * @param {string} preload HTML 5 preload attribute value
+     * @private
+     */
+
+  }, {
+    key: "_load",
+    value: function _load(media, peaks, preload) {
+      _get(_getPrototypeOf(MediaElementWebAudio.prototype), "_load", this).call(this, media, peaks, preload);
+
+      this.createMediaElementSource(media);
+    }
+    /**
+     * Create MediaElementSource node
+     *
+     * @since 3.2.0
+     * @param {HTMLMediaElement} mediaElement HTML5 Audio to load
+     */
+
+  }, {
+    key: "createMediaElementSource",
+    value: function createMediaElementSource(mediaElement) {
+      this.sourceMediaElement = this.ac.createMediaElementSource(mediaElement);
+      this.sourceMediaElement.connect(this.analyser);
+    }
+  }, {
+    key: "play",
+    value: function play(start, end) {
+      this.resumeAudioContext();
+      return _get(_getPrototypeOf(MediaElementWebAudio.prototype), "play", this).call(this, start, end);
+    }
+    /**
+     * This is called when wavesurfer is destroyed
+     *
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {
+      _get(_getPrototypeOf(MediaElementWebAudio.prototype), "destroy", this).call(this);
+
+      this.destroyWebAudio();
+    }
+  }]);
+
+  return MediaElementWebAudio;
+}(_mediaelement.default);
+
+exports.default = MediaElementWebAudio;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/mediaelement.js":
+/*!*****************************!*\
+  !*** ./src/mediaelement.js ***!
+  \*****************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var _webaudio = _interopRequireDefault(__webpack_require__(/*! ./webaudio */ "./src/webaudio.js"));
+
+var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }
+
+function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+/**
+ * MediaElement backend
+ */
+var MediaElement = /*#__PURE__*/function (_WebAudio) {
+  _inherits(MediaElement, _WebAudio);
+
+  var _super = _createSuper(MediaElement);
+
+  /**
+   * Construct the backend
+   *
+   * @param {WavesurferParams} params Wavesurfer parameters
+   */
+  function MediaElement(params) {
+    var _this;
+
+    _classCallCheck(this, MediaElement);
+
+    _this = _super.call(this, params);
+    /** @private */
+
+    _this.params = params;
+    /**
+     * Initially a dummy media element to catch errors. Once `_load` is
+     * called, this will contain the actual `HTMLMediaElement`.
+     * @private
+     */
+
+    _this.media = {
+      currentTime: 0,
+      duration: 0,
+      paused: true,
+      playbackRate: 1,
+      play: function play() {},
+      pause: function pause() {},
+      volume: 0
+    };
+    /** @private */
+
+    _this.mediaType = params.mediaType.toLowerCase();
+    /** @private */
+
+    _this.elementPosition = params.elementPosition;
+    /** @private */
+
+    _this.peaks = null;
+    /** @private */
+
+    _this.playbackRate = 1;
+    /** @private */
+
+    _this.volume = 1;
+    /** @private */
+
+    _this.isMuted = false;
+    /** @private */
+
+    _this.buffer = null;
+    /** @private */
+
+    _this.onPlayEnd = null;
+    /** @private */
+
+    _this.mediaListeners = {};
+    return _this;
+  }
+  /**
+   * Initialise the backend, called in `wavesurfer.createBackend()`
+   */
+
+
+  _createClass(MediaElement, [{
+    key: "init",
+    value: function init() {
+      this.setPlaybackRate(this.params.audioRate);
+      this.createTimer();
+    }
+    /**
+     * Attach event listeners to media element.
+     */
+
+  }, {
+    key: "_setupMediaListeners",
+    value: function _setupMediaListeners() {
+      var _this2 = this;
+
+      this.mediaListeners.error = function () {
+        _this2.fireEvent('error', 'Error loading media element');
+      };
+
+      this.mediaListeners.canplay = function () {
+        _this2.fireEvent('canplay');
+      };
+
+      this.mediaListeners.ended = function () {
+        _this2.fireEvent('finish');
+      }; // listen to and relay play, pause and seeked events to enable
+      // playback control from the external media element
+
+
+      this.mediaListeners.play = function () {
+        _this2.fireEvent('play');
+      };
+
+      this.mediaListeners.pause = function () {
+        _this2.fireEvent('pause');
+      };
+
+      this.mediaListeners.seeked = function (event) {
+        _this2.fireEvent('seek');
+      };
+
+      this.mediaListeners.volumechange = function (event) {
+        _this2.isMuted = _this2.media.muted;
+
+        if (_this2.isMuted) {
+          _this2.volume = 0;
+        } else {
+          _this2.volume = _this2.media.volume;
+        }
+
+        _this2.fireEvent('volume');
+      }; // reset event listeners
+
+
+      Object.keys(this.mediaListeners).forEach(function (id) {
+        _this2.media.removeEventListener(id, _this2.mediaListeners[id]);
+
+        _this2.media.addEventListener(id, _this2.mediaListeners[id]);
+      });
+    }
+    /**
+     * Create a timer to provide a more precise `audioprocess` event.
+     */
+
+  }, {
+    key: "createTimer",
+    value: function createTimer() {
+      var _this3 = this;
+
+      var onAudioProcess = function onAudioProcess() {
+        if (_this3.isPaused()) {
+          return;
+        }
+
+        _this3.fireEvent('audioprocess', _this3.getCurrentTime()); // Call again in the next frame
+
+
+        util.frame(onAudioProcess)();
+      };
+
+      this.on('play', onAudioProcess); // Update the progress one more time to prevent it from being stuck in
+      // case of lower framerates
+
+      this.on('pause', function () {
+        _this3.fireEvent('audioprocess', _this3.getCurrentTime());
+      });
+    }
+    /**
+     * Create media element with url as its source,
+     * and append to container element.
+     *
+     * @param {string} url Path to media file
+     * @param {HTMLElement} container HTML element
+     * @param {number[]|Number.<Array[]>} peaks Array of peak data
+     * @param {string} preload HTML 5 preload attribute value
+     * @throws Will throw an error if the `url` argument is not a valid media
+     * element.
+     */
+
+  }, {
+    key: "load",
+    value: function load(url, container, peaks, preload) {
+      var media = document.createElement(this.mediaType);
+      media.controls = this.params.mediaControls;
+      media.autoplay = this.params.autoplay || false;
+      media.preload = preload == null ? 'auto' : preload;
+      media.src = url;
+      media.style.width = '100%';
+      var prevMedia = container.querySelector(this.mediaType);
+
+      if (prevMedia) {
+        container.removeChild(prevMedia);
+      }
+
+      container.appendChild(media);
+
+      this._load(media, peaks, preload);
+    }
+    /**
+     * Load existing media element.
+     *
+     * @param {HTMLMediaElement} elt HTML5 Audio or Video element
+     * @param {number[]|Number.<Array[]>} peaks Array of peak data
+     */
+
+  }, {
+    key: "loadElt",
+    value: function loadElt(elt, peaks) {
+      elt.controls = this.params.mediaControls;
+      elt.autoplay = this.params.autoplay || false;
+
+      this._load(elt, peaks, elt.preload);
+    }
+    /**
+     * Method called by both `load` (from url)
+     * and `loadElt` (existing media element) methods.
+     *
+     * @param {HTMLMediaElement} media HTML5 Audio or Video element
+     * @param {number[]|Number.<Array[]>} peaks Array of peak data
+     * @param {string} preload HTML 5 preload attribute value
+     * @throws Will throw an error if the `media` argument is not a valid media
+     * element.
+     * @private
+     */
+
+  }, {
+    key: "_load",
+    value: function _load(media, peaks, preload) {
+      // verify media element is valid
+      if (!(media instanceof HTMLMediaElement) || typeof media.addEventListener === 'undefined') {
+        throw new Error('media parameter is not a valid media element');
+      } // load must be called manually on iOS, otherwise peaks won't draw
+      // until a user interaction triggers load --> 'ready' event
+      //
+      // note that we avoid calling media.load here when given peaks and preload == 'none'
+      // as this almost always triggers some browser fetch of the media.
+
+
+      if (typeof media.load == 'function' && !(peaks && preload == 'none')) {
+        // Resets the media element and restarts the media resource. Any
+        // pending events are discarded. How much media data is fetched is
+        // still affected by the preload attribute.
+        media.load();
+      }
+
+      this.media = media;
+
+      this._setupMediaListeners();
+
+      this.peaks = peaks;
+      this.onPlayEnd = null;
+      this.buffer = null;
+      this.isMuted = media.muted;
+      this.setPlaybackRate(this.playbackRate);
+      this.setVolume(this.volume);
+    }
+    /**
+     * Used by `wavesurfer.isPlaying()` and `wavesurfer.playPause()`
+     *
+     * @return {boolean} Media paused or not
+     */
+
+  }, {
+    key: "isPaused",
+    value: function isPaused() {
+      return !this.media || this.media.paused;
+    }
+    /**
+     * Used by `wavesurfer.getDuration()`
+     *
+     * @return {number} Duration
+     */
+
+  }, {
+    key: "getDuration",
+    value: function getDuration() {
+      if (this.explicitDuration) {
+        return this.explicitDuration;
+      }
+
+      var duration = (this.buffer || this.media).duration;
+
+      if (duration >= Infinity) {
+        // streaming audio
+        duration = this.media.seekable.end(0);
+      }
+
+      return duration;
+    }
+    /**
+     * Returns the current time in seconds relative to the audio-clip's
+     * duration.
+     *
+     * @return {number} Current time
+     */
+
+  }, {
+    key: "getCurrentTime",
+    value: function getCurrentTime() {
+      return this.media && this.media.currentTime;
+    }
+    /**
+     * Get the position from 0 to 1
+     *
+     * @return {number} Current position
+     */
+
+  }, {
+    key: "getPlayedPercents",
+    value: function getPlayedPercents() {
+      return this.getCurrentTime() / this.getDuration() || 0;
+    }
+    /**
+     * Get the audio source playback rate.
+     *
+     * @return {number} Playback rate
+     */
+
+  }, {
+    key: "getPlaybackRate",
+    value: function getPlaybackRate() {
+      return this.playbackRate || this.media.playbackRate;
+    }
+    /**
+     * Set the audio source playback rate.
+     *
+     * @param {number} value Playback rate
+     */
+
+  }, {
+    key: "setPlaybackRate",
+    value: function setPlaybackRate(value) {
+      this.playbackRate = value || 1;
+      this.media.playbackRate = this.playbackRate;
+    }
+    /**
+     * Used by `wavesurfer.seekTo()`
+     *
+     * @param {number} start Position to start at in seconds
+     */
+
+  }, {
+    key: "seekTo",
+    value: function seekTo(start) {
+      if (start != null) {
+        this.media.currentTime = start;
+      }
+
+      this.clearPlayEnd();
+    }
+    /**
+     * Plays the loaded audio region.
+     *
+     * @param {number} start Start offset in seconds, relative to the beginning
+     * of a clip.
+     * @param {number} end When to stop, relative to the beginning of a clip.
+     * @emits MediaElement#play
+     * @return {Promise} Result
+     */
+
+  }, {
+    key: "play",
+    value: function play(start, end) {
+      this.seekTo(start);
+      var promise = this.media.play();
+      end && this.setPlayEnd(end);
+      return promise;
+    }
+    /**
+     * Pauses the loaded audio.
+     *
+     * @emits MediaElement#pause
+     * @return {Promise} Result
+     */
+
+  }, {
+    key: "pause",
+    value: function pause() {
+      var promise;
+
+      if (this.media) {
+        promise = this.media.pause();
+      }
+
+      this.clearPlayEnd();
+      return promise;
+    }
+    /**
+     * Set the play end
+     *
+     * @param {number} end Where to end
+     */
+
+  }, {
+    key: "setPlayEnd",
+    value: function setPlayEnd(end) {
+      var _this4 = this;
+
+      this.clearPlayEnd();
+
+      this._onPlayEnd = function (time) {
+        if (time >= end) {
+          _this4.pause();
+
+          _this4.seekTo(end);
+        }
+      };
+
+      this.on('audioprocess', this._onPlayEnd);
+    }
+    /** @private */
+
+  }, {
+    key: "clearPlayEnd",
+    value: function clearPlayEnd() {
+      if (this._onPlayEnd) {
+        this.un('audioprocess', this._onPlayEnd);
+        this._onPlayEnd = null;
+      }
+    }
+    /**
+     * Compute the max and min value of the waveform when broken into
+     * <length> subranges.
+     *
+     * @param {number} length How many subranges to break the waveform into.
+     * @param {number} first First sample in the required range.
+     * @param {number} last Last sample in the required range.
+     * @return {number[]|Number.<Array[]>} Array of 2*<length> peaks or array of
+     * arrays of peaks consisting of (max, min) values for each subrange.
+     */
+
+  }, {
+    key: "getPeaks",
+    value: function getPeaks(length, first, last) {
+      if (this.buffer) {
+        return _get(_getPrototypeOf(MediaElement.prototype), "getPeaks", this).call(this, length, first, last);
+      }
+
+      return this.peaks || [];
+    }
+    /**
+     * Set the sink id for the media player
+     *
+     * @param {string} deviceId String value representing audio device id.
+     * @returns {Promise} A Promise that resolves to `undefined` when there
+     * are no errors.
+     */
+
+  }, {
+    key: "setSinkId",
+    value: function setSinkId(deviceId) {
+      if (deviceId) {
+        if (!this.media.setSinkId) {
+          return Promise.reject(new Error('setSinkId is not supported in your browser'));
+        }
+
+        return this.media.setSinkId(deviceId);
+      }
+
+      return Promise.reject(new Error('Invalid deviceId: ' + deviceId));
+    }
+    /**
+     * Get the current volume
+     *
+     * @return {number} value A floating point value between 0 and 1.
+     */
+
+  }, {
+    key: "getVolume",
+    value: function getVolume() {
+      return this.volume;
+    }
+    /**
+     * Set the audio volume
+     *
+     * @param {number} value A floating point value between 0 and 1.
+     */
+
+  }, {
+    key: "setVolume",
+    value: function setVolume(value) {
+      this.volume = value; // no need to change when it's already at that volume
+
+      if (this.media.volume !== this.volume) {
+        this.media.volume = this.volume;
+      }
+    }
+    /**
+     * Enable or disable muted audio
+     *
+     * @since 4.0.0
+     * @param {boolean} muted Specify `true` to mute audio.
+     */
+
+  }, {
+    key: "setMute",
+    value: function setMute(muted) {
+      // This causes a volume change to be emitted too through the
+      // volumechange event listener.
+      this.isMuted = this.media.muted = muted;
+    }
+    /**
+     * This is called when wavesurfer is destroyed
+     *
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {
+      var _this5 = this;
+
+      this.pause();
+      this.unAll();
+      this.destroyed = true; // cleanup media event listeners
+
+      Object.keys(this.mediaListeners).forEach(function (id) {
+        if (_this5.media) {
+          _this5.media.removeEventListener(id, _this5.mediaListeners[id]);
+        }
+      });
+
+      if (this.params.removeMediaElementOnDestroy && this.media && this.media.parentNode) {
+        this.media.parentNode.removeChild(this.media);
+      }
+
+      this.media = null;
+    }
+  }]);
+
+  return MediaElement;
+}(_webaudio.default);
+
+exports.default = MediaElement;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/peakcache.js":
+/*!**************************!*\
+  !*** ./src/peakcache.js ***!
+  \**************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+/**
+ * Caches the decoded peaks data to improve rendering speed for large audio
+ *
+ * Is used if the option parameter `partialRender` is set to `true`
+ */
+var PeakCache = /*#__PURE__*/function () {
+  /**
+   * Instantiate cache
+   */
+  function PeakCache() {
+    _classCallCheck(this, PeakCache);
+
+    this.clearPeakCache();
+  }
+  /**
+   * Empty the cache
+   */
+
+
+  _createClass(PeakCache, [{
+    key: "clearPeakCache",
+    value: function clearPeakCache() {
+      /**
+       * Flat array with entries that are always in pairs to mark the
+       * beginning and end of each subrange.  This is a convenience so we can
+       * iterate over the pairs for easy set difference operations.
+       * @private
+       */
+      this.peakCacheRanges = [];
+      /**
+       * Length of the entire cachable region, used for resetting the cache
+       * when this changes (zoom events, for instance).
+       * @private
+       */
+
+      this.peakCacheLength = -1;
+    }
+    /**
+     * Add a range of peaks to the cache
+     *
+     * @param {number} length The length of the range
+     * @param {number} start The x offset of the start of the range
+     * @param {number} end The x offset of the end of the range
+     * @return {Number.<Array[]>} Array with arrays of numbers
+     */
+
+  }, {
+    key: "addRangeToPeakCache",
+    value: function addRangeToPeakCache(length, start, end) {
+      if (length != this.peakCacheLength) {
+        this.clearPeakCache();
+        this.peakCacheLength = length;
+      } // Return ranges that weren't in the cache before the call.
+
+
+      var uncachedRanges = [];
+      var i = 0; // Skip ranges before the current start.
+
+      while (i < this.peakCacheRanges.length && this.peakCacheRanges[i] < start) {
+        i++;
+      } // If |i| is even, |start| falls after an existing range.  Otherwise,
+      // |start| falls between an existing range, and the uncached region
+      // starts when we encounter the next node in |peakCacheRanges| or
+      // |end|, whichever comes first.
+
+
+      if (i % 2 == 0) {
+        uncachedRanges.push(start);
+      }
+
+      while (i < this.peakCacheRanges.length && this.peakCacheRanges[i] <= end) {
+        uncachedRanges.push(this.peakCacheRanges[i]);
+        i++;
+      } // If |i| is even, |end| is after all existing ranges.
+
+
+      if (i % 2 == 0) {
+        uncachedRanges.push(end);
+      } // Filter out the 0-length ranges.
+
+
+      uncachedRanges = uncachedRanges.filter(function (item, pos, arr) {
+        if (pos == 0) {
+          return item != arr[pos + 1];
+        } else if (pos == arr.length - 1) {
+          return item != arr[pos - 1];
+        }
+
+        return item != arr[pos - 1] && item != arr[pos + 1];
+      }); // Merge the two ranges together, uncachedRanges will either contain
+      // wholly new points, or duplicates of points in peakCacheRanges.  If
+      // duplicates are detected, remove both and extend the range.
+
+      this.peakCacheRanges = this.peakCacheRanges.concat(uncachedRanges);
+      this.peakCacheRanges = this.peakCacheRanges.sort(function (a, b) {
+        return a - b;
+      }).filter(function (item, pos, arr) {
+        if (pos == 0) {
+          return item != arr[pos + 1];
+        } else if (pos == arr.length - 1) {
+          return item != arr[pos - 1];
+        }
+
+        return item != arr[pos - 1] && item != arr[pos + 1];
+      }); // Push the uncached ranges into an array of arrays for ease of
+      // iteration in the functions that call this.
+
+      var uncachedRangePairs = [];
+
+      for (i = 0; i < uncachedRanges.length; i += 2) {
+        uncachedRangePairs.push([uncachedRanges[i], uncachedRanges[i + 1]]);
+      }
+
+      return uncachedRangePairs;
+    }
+    /**
+     * For testing
+     *
+     * @return {Number.<Array[]>} Array with arrays of numbers
+     */
+
+  }, {
+    key: "getCacheRanges",
+    value: function getCacheRanges() {
+      var peakCacheRangePairs = [];
+      var i;
+
+      for (i = 0; i < this.peakCacheRanges.length; i += 2) {
+        peakCacheRangePairs.push([this.peakCacheRanges[i], this.peakCacheRanges[i + 1]]);
+      }
+
+      return peakCacheRangePairs;
+    }
+  }]);
+
+  return PeakCache;
+}();
+
+exports.default = PeakCache;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/absMax.js":
+/*!****************************!*\
+  !*** ./src/util/absMax.js ***!
+  \****************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = absMax;
+
+var _max = _interopRequireDefault(__webpack_require__(/*! ./max */ "./src/util/max.js"));
+
+var _min = _interopRequireDefault(__webpack_require__(/*! ./min */ "./src/util/min.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Get the largest absolute value in an array
+ *
+ * @param   {Array} values Array of numbers
+ * @returns {Number} Largest number found
+ * @example console.log(max([-3, 2, 1]), max([-3, 2, 4])); // logs 3 4
+ * @since 4.3.0
+ */
+function absMax(values) {
+  var max = (0, _max.default)(values);
+  var min = (0, _min.default)(values);
+  return -min > max ? -min : max;
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/clamp.js":
+/*!***************************!*\
+  !*** ./src/util/clamp.js ***!
+  \***************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = clamp;
+
+/**
+ * Returns a number limited to the given range.
+ *
+ * @param {number} val The number to be limited to a range
+ * @param {number} min The lower boundary of the limit range
+ * @param {number} max The upper boundary of the limit range
+ * @returns {number} A number in the range [min, max]
+ */
+function clamp(val, min, max) {
+  return Math.min(Math.max(min, val), max);
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/fetch.js":
+/*!***************************!*\
+  !*** ./src/util/fetch.js ***!
+  \***************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = fetchFile;
+
+var _observer = _interopRequireDefault(__webpack_require__(/*! ./observer */ "./src/util/observer.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+var ProgressHandler = /*#__PURE__*/function () {
+  /**
+   * Instantiate ProgressHandler
+   *
+   * @param {Observer} instance The `fetchFile` observer instance.
+   * @param {Number} contentLength Content length.
+   * @param {Response} response Response object.
+   */
+  function ProgressHandler(instance, contentLength, response) {
+    _classCallCheck(this, ProgressHandler);
+
+    this.instance = instance;
+    this.instance._reader = response.body.getReader();
+    this.total = parseInt(contentLength, 10);
+    this.loaded = 0;
+  }
+  /**
+   * A method that is called once, immediately after the `ReadableStream``
+   * is constructed.
+   *
+   * @param {ReadableStreamDefaultController} controller Controller instance
+   *     used to control the stream.
+   */
+
+
+  _createClass(ProgressHandler, [{
+    key: "start",
+    value: function start(controller) {
+      var _this = this;
+
+      var read = function read() {
+        // instance._reader.read() returns a promise that resolves
+        // when a value has been received
+        _this.instance._reader.read().then(function (_ref) {
+          var done = _ref.done,
+              value = _ref.value;
+
+          // result objects contain two properties:
+          // done  - true if the stream has already given you all its data.
+          // value - some data. Always undefined when done is true.
+          if (done) {
+            // ensure onProgress called when content-length=0
+            if (_this.total === 0) {
+              _this.instance.onProgress.call(_this.instance, {
+                loaded: _this.loaded,
+                total: _this.total,
+                lengthComputable: false
+              });
+            } // no more data needs to be consumed, close the stream
+
+
+            controller.close();
+            return;
+          }
+
+          _this.loaded += value.byteLength;
+
+          _this.instance.onProgress.call(_this.instance, {
+            loaded: _this.loaded,
+            total: _this.total,
+            lengthComputable: !(_this.total === 0)
+          }); // enqueue the next data chunk into our target stream
+
+
+          controller.enqueue(value);
+          read();
+        }).catch(function (error) {
+          controller.error(error);
+        });
+      };
+
+      read();
+    }
+  }]);
+
+  return ProgressHandler;
+}();
+/**
+ * Load a file using `fetch`.
+ *
+ * @param {object} options Request options to use. See example below.
+ * @returns {Observer} Observer instance
+ * @example
+ * // default options
+ * let options = {
+ *     url: undefined,
+ *     method: 'GET',
+ *     mode: 'cors',
+ *     credentials: 'same-origin',
+ *     cache: 'default',
+ *     responseType: 'json',
+ *     requestHeaders: [],
+ *     redirect: 'follow',
+ *     referrer: 'client'
+ * };
+ *
+ * // override some options
+ * options.url = '../media/demo.wav';
+
+ * // available types: 'arraybuffer', 'blob', 'json' or 'text'
+ * options.responseType = 'arraybuffer';
+ *
+ * // make fetch call
+ * let request = util.fetchFile(options);
+ *
+ * // listen for events
+ * request.on('progress', e => {
+ *     console.log('progress', e);
+ * });
+ *
+ * request.on('success', data => {
+ *     console.log('success!', data);
+ * });
+ *
+ * request.on('error', e => {
+ *     console.warn('fetchFile error: ', e);
+ * });
+ */
+// const { AbortController, abortableFetch } = require('abortcontroller-polyfill/dist/cjs-ponyfill')
+// const AbortController = require("abort-controller")
+// console.log("AbortController", AbortController)
+
+// const {AbortController} = AbortControllerShim
+
+function fetchFile(options) {
+  if (!options) {
+    throw new Error('fetch options missing');
+  } else if (!options.url) {
+    throw new Error('fetch url missing');
+  }
+
+  var instance = new _observer.default();
+  var fetchHeaders = new Headers();
+  var fetchRequest = new Request(options.url); // add ability to abort
+
+  // instance.controller = new AbortController(); // check if headers have to be added
+  instance.controller = new AbortControllerShim.AbortController(); // check if headers have to be added
+
+  if (options && options.requestHeaders) {
+    // add custom request headers
+    options.requestHeaders.forEach(function (header) {
+      fetchHeaders.append(header.key, header.value);
+    });
+  } // parse fetch options
+
+
+  var responseType = options.responseType || 'json';
+  var fetchOptions = {
+    method: options.method || 'GET',
+    headers: fetchHeaders,
+    mode: options.mode || 'cors',
+    credentials: options.credentials || 'same-origin',
+    cache: options.cache || 'default',
+    redirect: options.redirect || 'follow',
+    referrer: options.referrer || 'client',
+    signal: instance.controller.signal
+  };
+  fetch(fetchRequest, fetchOptions).then(function (response) {
+    // store response reference
+    instance.response = response;
+    var progressAvailable = true;
+
+    if (!response.body) {
+      // ReadableStream is not yet supported in this browser
+      // see https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream
+      progressAvailable = false;
+    } // Server must send CORS header "Access-Control-Expose-Headers: content-length"
+
+
+    var contentLength = response.headers.get('content-length');
+
+    if (contentLength === null) {
+      // Content-Length server response header missing.
+      // Don't evaluate download progress if we can't compare against a total size
+      // see https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Access-Control-Expose-Headers
+      progressAvailable = false;
+    }
+
+    if (!progressAvailable) {
+      // not able to check download progress so skip it
+      return response;
+    } // fire progress event when during load
+
+
+    instance.onProgress = function (e) {
+      instance.fireEvent('progress', e);
+    };
+
+    return new Response(new ReadableStream(new ProgressHandler(instance, contentLength, response)), fetchOptions);
+  }).then(function (response) {
+    var errMsg;
+
+    if (response.ok) {
+      switch (responseType) {
+        case 'arraybuffer':
+          return response.arrayBuffer();
+
+        case 'json':
+          return response.json();
+
+        case 'blob':
+          return response.blob();
+
+        case 'text':
+          return response.text();
+
+        default:
+          errMsg = 'Unknown responseType: ' + responseType;
+          break;
+      }
+    }
+
+    if (!errMsg) {
+      errMsg = 'HTTP error status: ' + response.status;
+    }
+
+    throw new Error(errMsg);
+  }).then(function (response) {
+    instance.fireEvent('success', response);
+  }).catch(function (error) {
+    instance.fireEvent('error', error);
+  }); // return the fetch request
+
+  instance.fetchRequest = fetchRequest;
+  return instance;
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/frame.js":
+/*!***************************!*\
+  !*** ./src/util/frame.js ***!
+  \***************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = frame;
+
+var _requestAnimationFrame = _interopRequireDefault(__webpack_require__(/*! ./request-animation-frame */ "./src/util/request-animation-frame.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Create a function which will be called at the next requestAnimationFrame
+ * cycle
+ *
+ * @param {function} func The function to call
+ *
+ * @return {func} The function wrapped within a requestAnimationFrame
+ */
+function frame(func) {
+  return function () {
+    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+      args[_key] = arguments[_key];
+    }
+
+    return (0, _requestAnimationFrame.default)(function () {
+      return func.apply(void 0, args);
+    });
+  };
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/get-id.js":
+/*!****************************!*\
+  !*** ./src/util/get-id.js ***!
+  \****************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = getId;
+
+/**
+ * Get a random prefixed ID
+ *
+ * @param {String} prefix Prefix to use. Default is `'wavesurfer_'`.
+ * @returns {String} Random prefixed ID
+ * @example
+ * console.log(getId()); // logs 'wavesurfer_b5pors4ru6g'
+ *
+ * let prefix = 'foo-';
+ * console.log(getId(prefix)); // logs 'foo-b5pors4ru6g'
+ */
+function getId(prefix) {
+  if (prefix === undefined) {
+    prefix = 'wavesurfer_';
+  }
+
+  return prefix + Math.random().toString(32).substring(2);
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/index.js":
+/*!***************************!*\
+  !*** ./src/util/index.js ***!
+  \***************************/
+/***/ ((__unused_webpack_module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+Object.defineProperty(exports, "getId", ({
+  enumerable: true,
+  get: function get() {
+    return _getId.default;
+  }
+}));
+Object.defineProperty(exports, "max", ({
+  enumerable: true,
+  get: function get() {
+    return _max.default;
+  }
+}));
+Object.defineProperty(exports, "min", ({
+  enumerable: true,
+  get: function get() {
+    return _min.default;
+  }
+}));
+Object.defineProperty(exports, "absMax", ({
+  enumerable: true,
+  get: function get() {
+    return _absMax.default;
+  }
+}));
+Object.defineProperty(exports, "Observer", ({
+  enumerable: true,
+  get: function get() {
+    return _observer.default;
+  }
+}));
+Object.defineProperty(exports, "style", ({
+  enumerable: true,
+  get: function get() {
+    return _style.default;
+  }
+}));
+Object.defineProperty(exports, "requestAnimationFrame", ({
+  enumerable: true,
+  get: function get() {
+    return _requestAnimationFrame.default;
+  }
+}));
+Object.defineProperty(exports, "frame", ({
+  enumerable: true,
+  get: function get() {
+    return _frame.default;
+  }
+}));
+Object.defineProperty(exports, "debounce", ({
+  enumerable: true,
+  get: function get() {
+    return _debounce.default;
+  }
+}));
+Object.defineProperty(exports, "preventClick", ({
+  enumerable: true,
+  get: function get() {
+    return _preventClick.default;
+  }
+}));
+Object.defineProperty(exports, "fetchFile", ({
+  enumerable: true,
+  get: function get() {
+    return _fetch.default;
+  }
+}));
+Object.defineProperty(exports, "clamp", ({
+  enumerable: true,
+  get: function get() {
+    return _clamp.default;
+  }
+}));
+Object.defineProperty(exports, "withOrientation", ({
+  enumerable: true,
+  get: function get() {
+    return _orientation.default;
+  }
+}));
+
+var _getId = _interopRequireDefault(__webpack_require__(/*! ./get-id */ "./src/util/get-id.js"));
+
+var _max = _interopRequireDefault(__webpack_require__(/*! ./max */ "./src/util/max.js"));
+
+var _min = _interopRequireDefault(__webpack_require__(/*! ./min */ "./src/util/min.js"));
+
+var _absMax = _interopRequireDefault(__webpack_require__(/*! ./absMax */ "./src/util/absMax.js"));
+
+var _observer = _interopRequireDefault(__webpack_require__(/*! ./observer */ "./src/util/observer.js"));
+
+var _style = _interopRequireDefault(__webpack_require__(/*! ./style */ "./src/util/style.js"));
+
+var _requestAnimationFrame = _interopRequireDefault(__webpack_require__(/*! ./request-animation-frame */ "./src/util/request-animation-frame.js"));
+
+var _frame = _interopRequireDefault(__webpack_require__(/*! ./frame */ "./src/util/frame.js"));
+
+var _debounce = _interopRequireDefault(__webpack_require__(/*! debounce */ "./node_modules/debounce/index.js"));
+
+var _preventClick = _interopRequireDefault(__webpack_require__(/*! ./prevent-click */ "./src/util/prevent-click.js"));
+
+var _fetch = _interopRequireDefault(__webpack_require__(/*! ./fetch */ "./src/util/fetch.js"));
+
+var _clamp = _interopRequireDefault(__webpack_require__(/*! ./clamp */ "./src/util/clamp.js"));
+
+var _orientation = _interopRequireDefault(__webpack_require__(/*! ./orientation */ "./src/util/orientation.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/***/ }),
+
+/***/ "./src/util/max.js":
+/*!*************************!*\
+  !*** ./src/util/max.js ***!
+  \*************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = max;
+
+/**
+ * Get the largest value
+ *
+ * @param   {Array} values Array of numbers
+ * @returns {Number} Largest number found
+ * @example console.log(max([1, 2, 3])); // logs 3
+ */
+function max(values) {
+  var largest = -Infinity;
+  Object.keys(values).forEach(function (i) {
+    if (values[i] > largest) {
+      largest = values[i];
+    }
+  });
+  return largest;
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/min.js":
+/*!*************************!*\
+  !*** ./src/util/min.js ***!
+  \*************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = min;
+
+/**
+ * Get the smallest value
+ *
+ * @param   {Array} values Array of numbers
+ * @returns {Number} Smallest number found
+ * @example console.log(min([1, 2, 3])); // logs 1
+ */
+function min(values) {
+  var smallest = Number(Infinity);
+  Object.keys(values).forEach(function (i) {
+    if (values[i] < smallest) {
+      smallest = values[i];
+    }
+  });
+  return smallest;
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/observer.js":
+/*!******************************!*\
+  !*** ./src/util/observer.js ***!
+  \******************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+/**
+ * @typedef {Object} ListenerDescriptor
+ * @property {string} name The name of the event
+ * @property {function} callback The callback
+ * @property {function} un The function to call to remove the listener
+ */
+
+/**
+ * Observer class
+ */
+var Observer = /*#__PURE__*/function () {
+  /**
+   * Instantiate Observer
+   */
+  function Observer() {
+    _classCallCheck(this, Observer);
+
+    /**
+     * @private
+     * @todo Initialise the handlers here already and remove the conditional
+     * assignment in `on()`
+     */
+    this._disabledEventEmissions = [];
+    this.handlers = null;
+  }
+  /**
+   * Attach a handler function for an event.
+   *
+   * @param {string} event Name of the event to listen to
+   * @param {function} fn The callback to trigger when the event is fired
+   * @return {ListenerDescriptor} The event descriptor
+   */
+
+
+  _createClass(Observer, [{
+    key: "on",
+    value: function on(event, fn) {
+      var _this = this;
+
+      if (!this.handlers) {
+        this.handlers = {};
+      }
+
+      var handlers = this.handlers[event];
+
+      if (!handlers) {
+        handlers = this.handlers[event] = [];
+      }
+
+      handlers.push(fn); // Return an event descriptor
+
+      return {
+        name: event,
+        callback: fn,
+        un: function un(e, fn) {
+          return _this.un(e, fn);
+        }
+      };
+    }
+    /**
+     * Remove an event handler.
+     *
+     * @param {string} event Name of the event the listener that should be
+     * removed listens to
+     * @param {function} fn The callback that should be removed
+     */
+
+  }, {
+    key: "un",
+    value: function un(event, fn) {
+      if (!this.handlers) {
+        return;
+      }
+
+      var handlers = this.handlers[event];
+      var i;
+
+      if (handlers) {
+        if (fn) {
+          for (i = handlers.length - 1; i >= 0; i--) {
+            if (handlers[i] == fn) {
+              handlers.splice(i, 1);
+            }
+          }
+        } else {
+          handlers.length = 0;
+        }
+      }
+    }
+    /**
+     * Remove all event handlers.
+     */
+
+  }, {
+    key: "unAll",
+    value: function unAll() {
+      this.handlers = null;
+    }
+    /**
+     * Attach a handler to an event. The handler is executed at most once per
+     * event type.
+     *
+     * @param {string} event The event to listen to
+     * @param {function} handler The callback that is only to be called once
+     * @return {ListenerDescriptor} The event descriptor
+     */
+
+  }, {
+    key: "once",
+    value: function once(event, handler) {
+      var _this2 = this;
+
+      var fn = function fn() {
+        for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+          args[_key] = arguments[_key];
+        }
+
+        /*  eslint-disable no-invalid-this */
+        handler.apply(_this2, args);
+        /*  eslint-enable no-invalid-this */
+
+        setTimeout(function () {
+          _this2.un(event, fn);
+        }, 0);
+      };
+
+      return this.on(event, fn);
+    }
+    /**
+     * Disable firing a list of events by name. When specified, event handlers for any event type
+     * passed in here will not be called.
+     *
+     * @since 4.0.0
+     * @param {string[]} eventNames an array of event names to disable emissions for
+     * @example
+     * // disable seek and interaction events
+     * wavesurfer.setDisabledEventEmissions(['seek', 'interaction']);
+     */
+
+  }, {
+    key: "setDisabledEventEmissions",
+    value: function setDisabledEventEmissions(eventNames) {
+      this._disabledEventEmissions = eventNames;
+    }
+    /**
+     * plugins borrow part of this class without calling the constructor,
+     * so we have to be careful about _disabledEventEmissions
+     */
+
+  }, {
+    key: "_isDisabledEventEmission",
+    value: function _isDisabledEventEmission(event) {
+      return this._disabledEventEmissions && this._disabledEventEmissions.includes(event);
+    }
+    /**
+     * Manually fire an event
+     *
+     * @param {string} event The event to fire manually
+     * @param {...any} args The arguments with which to call the listeners
+     */
+
+  }, {
+    key: "fireEvent",
+    value: function fireEvent(event) {
+      for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
+        args[_key2 - 1] = arguments[_key2];
+      }
+
+      if (!this.handlers || this._isDisabledEventEmission(event)) {
+        return;
+      }
+
+      var handlers = this.handlers[event];
+      handlers && handlers.forEach(function (fn) {
+        fn.apply(void 0, args);
+      });
+    }
+  }]);
+
+  return Observer;
+}();
+
+exports.default = Observer;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/orientation.js":
+/*!*********************************!*\
+  !*** ./src/util/orientation.js ***!
+  \*********************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = withOrientation;
+var verticalPropMap = {
+  width: 'height',
+  height: 'width',
+  overflowX: 'overflowY',
+  overflowY: 'overflowX',
+  clientWidth: 'clientHeight',
+  clientHeight: 'clientWidth',
+  clientX: 'clientY',
+  clientY: 'clientX',
+  scrollWidth: 'scrollHeight',
+  scrollLeft: 'scrollTop',
+  offsetLeft: 'offsetTop',
+  offsetTop: 'offsetLeft',
+  offsetHeight: 'offsetWidth',
+  offsetWidth: 'offsetHeight',
+  left: 'top',
+  right: 'bottom',
+  top: 'left',
+  bottom: 'right',
+  borderRightStyle: 'borderBottomStyle',
+  borderRightWidth: 'borderBottomWidth',
+  borderRightColor: 'borderBottomColor'
+};
+/**
+ * Convert a horizontally-oriented property name to a vertical one.
+ *
+ * @param {string} prop A property name
+ * @param {bool} vertical Whether the element is oriented vertically
+ * @returns {string} prop, converted appropriately
+ */
+
+function mapProp(prop, vertical) {
+  if (Object.prototype.hasOwnProperty.call(verticalPropMap, prop)) {
+    return vertical ? verticalPropMap[prop] : prop;
+  } else {
+    return prop;
+  }
+}
+
+var isProxy = Symbol("isProxy");
+/**
+ * Returns an appropriately oriented object based on vertical.
+ * If vertical is true, attribute getting and setting will be mapped through
+ * verticalPropMap, so that e.g. getting the object's .width will give its
+ * .height instead.
+ * Certain methods of an oriented object will return oriented objects as well.
+ * Oriented objects can't be added to the DOM directly since they are Proxy objects
+ * and thus fail typechecks. Use domElement to get the actual element for this.
+ *
+ * @param {object} target The object to be wrapped and oriented
+ * @param {bool} vertical Whether the element is oriented vertically
+ * @returns {Proxy} An oriented object with attr translation via verticalAttrMap
+ * @since 5.0.0
+ */
+
+function withOrientation(target, vertical) {
+  if (target[isProxy]) {
+    return target;
+  } else {
+    return new Proxy(target, {
+      get: function get(obj, prop, receiver) {
+        if (prop === isProxy) {
+          return true;
+        } else if (prop === 'domElement') {
+          return obj;
+        } else if (prop === 'style') {
+          return withOrientation(obj.style, vertical);
+        } else if (prop === 'canvas') {
+          return withOrientation(obj.canvas, vertical);
+        } else if (prop === 'getBoundingClientRect') {
+          return function () {
+            return withOrientation(obj.getBoundingClientRect.apply(obj, arguments), vertical);
+          };
+        } else if (prop === 'getContext') {
+          return function () {
+            return withOrientation(obj.getContext.apply(obj, arguments), vertical);
+          };
+        } else {
+          var value = obj[mapProp(prop, vertical)];
+          return typeof value == 'function' ? value.bind(obj) : value;
+        }
+      },
+      set: function set(obj, prop, value) {
+        obj[mapProp(prop, vertical)] = value;
+        return true;
+      }
+    });
+  }
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/prevent-click.js":
+/*!***********************************!*\
+  !*** ./src/util/prevent-click.js ***!
+  \***********************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = preventClick;
+
+/**
+ * Stops propagation of click event and removes event listener
+ *
+ * @private
+ * @param {object} event The click event
+ */
+function preventClickHandler(event) {
+  event.stopPropagation();
+  document.body.removeEventListener('click', preventClickHandler, true);
+}
+/**
+ * Starts listening for click event and prevent propagation
+ *
+ * @param {object} values Values
+ */
+
+
+function preventClick(values) {
+  document.body.addEventListener('click', preventClickHandler, true);
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/request-animation-frame.js":
+/*!*********************************************!*\
+  !*** ./src/util/request-animation-frame.js ***!
+  \*********************************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+/* eslint-disable valid-jsdoc */
+
+/**
+ * Returns the `requestAnimationFrame` function for the browser, or a shim with
+ * `setTimeout` if the function is not found
+ *
+ * @return {function} Available `requestAnimationFrame` function for the browser
+ */
+var _default = (window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback, element) {
+  return setTimeout(callback, 1000 / 60);
+}).bind(window);
+
+exports.default = _default;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/util/style.js":
+/*!***************************!*\
+  !*** ./src/util/style.js ***!
+  \***************************/
+/***/ ((module, exports) => {
+
+"use strict";
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = style;
+
+/**
+ * Apply a map of styles to an element
+ *
+ * @param {HTMLElement} el The element that the styles will be applied to
+ * @param {Object} styles The map of propName: attribute, both are used as-is
+ *
+ * @return {HTMLElement} el
+ */
+function style(el, styles) {
+  Object.keys(styles).forEach(function (prop) {
+    if (el.style[prop] !== styles[prop]) {
+      el.style[prop] = styles[prop];
+    }
+  });
+  return el;
+}
+
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/wavesurfer.js":
+/*!***************************!*\
+  !*** ./src/wavesurfer.js ***!
+  \***************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
+
+var _drawer = _interopRequireDefault(__webpack_require__(/*! ./drawer.multicanvas */ "./src/drawer.multicanvas.js"));
+
+var _webaudio = _interopRequireDefault(__webpack_require__(/*! ./webaudio */ "./src/webaudio.js"));
+
+var _mediaelement = _interopRequireDefault(__webpack_require__(/*! ./mediaelement */ "./src/mediaelement.js"));
+
+var _peakcache = _interopRequireDefault(__webpack_require__(/*! ./peakcache */ "./src/peakcache.js"));
+
+var _mediaelementWebaudio = _interopRequireDefault(__webpack_require__(/*! ./mediaelement-webaudio */ "./src/mediaelement-webaudio.js"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+/*
+ * This work is licensed under a BSD-3-Clause License.
+ */
+
+/** @external {HTMLElement} https://developer.mozilla.org/en/docs/Web/API/HTMLElement */
+
+/** @external {OfflineAudioContext} https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext */
+
+/** @external {File} https://developer.mozilla.org/en-US/docs/Web/API/File */
+
+/** @external {Blob} https://developer.mozilla.org/en-US/docs/Web/API/Blob */
+
+/** @external {CanvasRenderingContext2D} https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D */
+
+/** @external {MediaStreamConstraints} https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints */
+
+/** @external {AudioNode} https://developer.mozilla.org/de/docs/Web/API/AudioNode */
+
+/**
+ * @typedef {Object} WavesurferParams
+ * @property {AudioContext} audioContext=null Use your own previously
+ * initialized AudioContext or leave blank.
+ * @property {number} audioRate=1 Speed at which to play audio. Lower number is
+ * slower.
+ * @property {ScriptProcessorNode} audioScriptProcessor=null Use your own previously
+ * initialized ScriptProcessorNode or leave blank.
+ * @property {boolean} autoCenter=true If a scrollbar is present, center the
+ * waveform on current progress
+ * @property {number} autoCenterRate=5 If autoCenter is active, rate at which the
+ * waveform is centered
+ * @property {boolean} autoCenterImmediately=false If autoCenter is active, immediately
+ * center waveform on current progress
+ * @property {string} backend='WebAudio' `'WebAudio'|'MediaElement'|'MediaElementWebAudio'` In most cases
+ * you don't have to set this manually. MediaElement is a fallback for unsupported browsers.
+ * MediaElementWebAudio allows to use WebAudio API also with big audio files, loading audio like with
+ * MediaElement backend (HTML5 audio tag). You have to use the same methods of MediaElement backend for loading and
+ * playback, giving also peaks, so the audio data are not decoded. In this way you can use WebAudio features, like filters,
+ * also with audio with big duration. For example:
+ * ` wavesurfer.load(url | HTMLMediaElement, peaks, preload, duration);
+ *   wavesurfer.play();
+ *   wavesurfer.setFilter(customFilter);
+ * `
+ * @property {string} backgroundColor=null Change background color of the
+ * waveform container.
+ * @property {number} barHeight=1 The height of the wave bars.
+ * @property {number} barRadius=0 The radius of the wave bars. Makes bars rounded
+ * @property {number} barGap=null The optional spacing between bars of the wave,
+ * if not provided will be calculated in legacy format.
+ * @property {number} barWidth=null Draw the waveform using bars.
+ * @property {number} barMinHeight=null If specified, draw at least a bar of this height,
+ * eliminating waveform gaps
+ * @property {boolean} closeAudioContext=false Close and nullify all audio
+ * contexts when the destroy method is called.
+ * @property {!string|HTMLElement} container CSS selector or HTML element where
+ * the waveform should be drawn. This is the only required parameter.
+ * @property {string} cursorColor='#333' The fill color of the cursor indicating
+ * the playhead position.
+ * @property {number} cursorWidth=1 Measured in pixels.
+ * @property {object} drawingContextAttributes={desynchronized: false} Drawing context
+ * attributes.
+ * @property {number} duration=null Optional audio length so pre-rendered peaks
+ * can be display immediately for example.
+ * @property {boolean} fillParent=true Whether to fill the entire container or
+ * draw only according to `minPxPerSec`.
+ * @property {boolean} forceDecode=false Force decoding of audio using web audio
+ * when zooming to get a more detailed waveform.
+ * @property {number} height=128 The height of the waveform. Measured in
+ * pixels.
+ * @property {boolean} hideScrollbar=false Whether to hide the horizontal
+ * scrollbar when one would normally be shown.
+ * @property {boolean} interact=true Whether the mouse interaction will be
+ * enabled at initialization. You can switch this parameter at any time later
+ * on.
+ * @property {boolean} loopSelection=true (Use with regions plugin) Enable
+ * looping of selected regions
+ * @property {number} maxCanvasWidth=4000 Maximum width of a single canvas in
+ * pixels, excluding a small overlap (2 * `pixelRatio`, rounded up to the next
+ * even integer). If the waveform is longer than this value, additional canvases
+ * will be used to render the waveform, which is useful for very large waveforms
+ * that may be too wide for browsers to draw on a single canvas.
+ * @property {boolean} mediaControls=false (Use with backend `MediaElement` or `MediaElementWebAudio`)
+ * this enables the native controls for the media element
+ * @property {string} mediaType='audio' (Use with backend `MediaElement` or `MediaElementWebAudio`)
+ * `'audio'|'video'` ('video' only for `MediaElement`)
+ * @property {number} minPxPerSec=20 Minimum number of pixels per second of
+ * audio.
+ * @property {boolean} normalize=false If true, normalize by the maximum peak
+ * instead of 1.0.
+ * @property {boolean} partialRender=false Use the PeakCache to improve
+ * rendering speed of large waveforms
+ * @property {number} pixelRatio=window.devicePixelRatio The pixel ratio used to
+ * calculate display
+ * @property {PluginDefinition[]} plugins=[] An array of plugin definitions to
+ * register during instantiation, they will be directly initialised unless they
+ * are added with the `deferInit` property set to true.
+ * @property {string} progressColor='#555' The fill color of the part of the
+ * waveform behind the cursor. When `progressColor` and `waveColor` are the same
+ * the progress wave is not rendered at all.
+ * @property {boolean} removeMediaElementOnDestroy=true Set to false to keep the
+ * media element in the DOM when the player is destroyed. This is useful when
+ * reusing an existing media element via the `loadMediaElement` method.
+ * @property {Object} renderer=MultiCanvas Can be used to inject a custom
+ * renderer.
+ * @property {boolean|number} responsive=false If set to `true` resize the
+ * waveform, when the window is resized. This is debounced with a `100ms`
+ * timeout by default. If this parameter is a number it represents that timeout.
+ * @property {boolean} rtl=false If set to `true`, renders waveform from
+ * right-to-left.
+ * @property {boolean} scrollParent=false Whether to scroll the container with a
+ * lengthy waveform. Otherwise the waveform is shrunk to the container width
+ * (see fillParent).
+ * @property {number} skipLength=2 Number of seconds to skip with the
+ * skipForward() and skipBackward() methods.
+ * @property {boolean} splitChannels=false Render with separate waveforms for
+ * the channels of the audio
+ * @property {SplitChannelOptions} splitChannelsOptions={} Options for splitChannel rendering
+ * @property {boolean} vertical=false Render the waveform vertically instead of horizontally.
+ * @property {string} waveColor='#999' The fill color of the waveform after the
+ * cursor.
+ * @property {object} xhr={} XHR options. For example:
+ * `let xhr = {
+ *     cache: 'default',
+ *     mode: 'cors',
+ *     method: 'GET',
+ *     credentials: 'same-origin',
+ *     redirect: 'follow',
+ *     referrer: 'client',
+ *     requestHeaders: [
+ *         {
+ *             key: 'Authorization',
+ *             value: 'my-token'
+ *         }
+ *     ]
+ * };`
+ */
+
+/**
+ * @typedef {Object} PluginDefinition
+ * @desc The Object used to describe a plugin
+ * @example wavesurfer.addPlugin(pluginDefinition);
+ * @property {string} name The name of the plugin, the plugin instance will be
+ * added as a property to the wavesurfer instance under this name
+ * @property {?Object} staticProps The properties that should be added to the
+ * wavesurfer instance as static properties
+ * @property {?boolean} deferInit Don't initialise plugin
+ * automatically
+ * @property {Object} params={} The plugin parameters, they are the first parameter
+ * passed to the plugin class constructor function
+ * @property {PluginClass} instance The plugin instance factory, is called with
+ * the dependency specified in extends. Returns the plugin class.
+ */
+
+/**
+ * @typedef {Object} SplitChannelOptions
+ * @desc parameters applied when splitChannels option is true
+ * @property {boolean} overlay=false determines whether channels are rendered on top of each other or on separate tracks
+ * @property {object} channelColors={} object describing color for each channel. Example:
+ * {
+ *     0: {
+ *         progressColor: 'green',
+ *         waveColor: 'pink'
+ *     },
+ *     1: {
+ *         progressColor: 'orange',
+ *         waveColor: 'purple'
+ *     }
+ * }
+ * @property {number[]} filterChannels=[] indexes of channels to be hidden from rendering
+ * @property {boolean} relativeNormalization=false determines whether
+ * normalization is done per channel or maintains proportionality between
+ * channels. Only applied when normalize and splitChannels are both true.
+ * @since 4.3.0
+ */
+
+/**
+ * @interface PluginClass
+ *
+ * @desc This is the interface which is implemented by all plugin classes. Note
+ * that this only turns into an observer after being passed through
+ * `wavesurfer.addPlugin`.
+ *
+ * @extends {Observer}
+ */
+var PluginClass = /*#__PURE__*/function () {
+  /**
+   * Construct the plugin
+   *
+   * @param {Object} params={} The plugin params (specific to the plugin)
+   * @param {Object} ws The wavesurfer instance
+   */
+  function PluginClass(params, ws) {
+    _classCallCheck(this, PluginClass);
+  }
+  /**
+   * Initialise the plugin
+   *
+   * Start doing something. This is called by
+   * `wavesurfer.initPlugin(pluginName)`
+   */
+
+
+  _createClass(PluginClass, [{
+    key: "create",
+    value:
+    /**
+     * Plugin definition factory
+     *
+     * This function must be used to create a plugin definition which can be
+     * used by wavesurfer to correctly instantiate the plugin.
+     *
+     * It returns a `PluginDefinition` object representing the plugin.
+     *
+     * @param {Object} params={} The plugin params (specific to the plugin)
+     */
+    function create(params) {}
+  }, {
+    key: "init",
+    value: function init() {}
+    /**
+     * Destroy the plugin instance
+     *
+     * Stop doing something. This is called by
+     * `wavesurfer.destroyPlugin(pluginName)`
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {}
+  }]);
+
+  return PluginClass;
+}();
+/**
+ * WaveSurfer core library class
+ *
+ * @extends {Observer}
+ * @example
+ * const params = {
+ *   container: '#waveform',
+ *   waveColor: 'violet',
+ *   progressColor: 'purple'
+ * };
+ *
+ * // initialise like this
+ * const wavesurfer = WaveSurfer.create(params);
+ *
+ * // or like this ...
+ * const wavesurfer = new WaveSurfer(params);
+ * wavesurfer.init();
+ *
+ * // load audio file
+ * wavesurfer.load('example/media/demo.wav');
+ */
+
+
+var WaveSurfer = /*#__PURE__*/function (_util$Observer) {
+  _inherits(WaveSurfer, _util$Observer);
+
+  var _super = _createSuper(WaveSurfer);
+
+  /**
+   * Initialise wavesurfer instance
+   *
+   * @param {WavesurferParams} params Instantiation options for wavesurfer
+   * @example
+   * const wavesurfer = new WaveSurfer(params);
+   * @returns {this} Wavesurfer instance
+   */
+  function WaveSurfer(params) {
+    var _this;
+
+    _classCallCheck(this, WaveSurfer);
+
+    _this = _super.call(this);
+    /**
+     * Extract relevant parameters (or defaults)
+     * @private
+     */
+
+    _this.defaultParams = {
+      audioContext: null,
+      audioScriptProcessor: null,
+      audioRate: 1,
+      autoCenter: true,
+      autoCenterRate: 5,
+      autoCenterImmediately: false,
+      backend: 'WebAudio',
+      backgroundColor: null,
+      barHeight: 1,
+      barRadius: 0,
+      barGap: null,
+      barMinHeight: null,
+      container: null,
+      cursorColor: '#333',
+      cursorWidth: 1,
+      dragSelection: true,
+      drawingContextAttributes: {
+        // Boolean that hints the user agent to reduce the latency
+        // by desynchronizing the canvas paint cycle from the event
+        // loop
+        desynchronized: false
+      },
+      duration: null,
+      fillParent: true,
+      forceDecode: false,
+      height: 128,
+      hideScrollbar: false,
+      interact: true,
+      loopSelection: true,
+      maxCanvasWidth: 4000,
+      mediaContainer: null,
+      mediaControls: false,
+      mediaType: 'audio',
+      minPxPerSec: 20,
+      normalize: false,
+      partialRender: false,
+      pixelRatio: window.devicePixelRatio || screen.deviceXDPI / screen.logicalXDPI,
+      plugins: [],
+      progressColor: '#555',
+      removeMediaElementOnDestroy: true,
+      renderer: _drawer.default,
+      responsive: false,
+      rtl: false,
+      scrollParent: false,
+      skipLength: 2,
+      splitChannels: false,
+      splitChannelsOptions: {
+        overlay: false,
+        channelColors: {},
+        filterChannels: [],
+        relativeNormalization: false
+      },
+      vertical: false,
+      waveColor: '#999',
+      xhr: {}
+    };
+    _this.backends = {
+      MediaElement: _mediaelement.default,
+      WebAudio: _webaudio.default,
+      MediaElementWebAudio: _mediaelementWebaudio.default
+    };
+    _this.util = util;
+    _this.params = Object.assign({}, _this.defaultParams, params);
+    _this.params.splitChannelsOptions = Object.assign({}, _this.defaultParams.splitChannelsOptions, params.splitChannelsOptions);
+    /** @private */
+
+    _this.container = 'string' == typeof params.container ? document.querySelector(_this.params.container) : _this.params.container;
+
+    if (!_this.container) {
+      throw new Error('Container element not found');
+    }
+
+    if (_this.params.mediaContainer == null) {
+      /** @private */
+      _this.mediaContainer = _this.container;
+    } else if (typeof _this.params.mediaContainer == 'string') {
+      /** @private */
+      _this.mediaContainer = document.querySelector(_this.params.mediaContainer);
+    } else {
+      /** @private */
+      _this.mediaContainer = _this.params.mediaContainer;
+    }
+
+    if (!_this.mediaContainer) {
+      throw new Error('Media Container element not found');
+    }
+
+    if (_this.params.maxCanvasWidth <= 1) {
+      throw new Error('maxCanvasWidth must be greater than 1');
+    } else if (_this.params.maxCanvasWidth % 2 == 1) {
+      throw new Error('maxCanvasWidth must be an even number');
+    }
+
+    if (_this.params.rtl === true) {
+      if (_this.params.vertical === true) {
+        util.style(_this.container, {
+          transform: 'rotateX(180deg)'
+        });
+      } else {
+        util.style(_this.container, {
+          transform: 'rotateY(180deg)'
+        });
+      }
+    }
+
+    if (_this.params.backgroundColor) {
+      _this.setBackgroundColor(_this.params.backgroundColor);
+    }
+    /**
+     * @private Used to save the current volume when muting so we can
+     * restore once unmuted
+     * @type {number}
+     */
+
+
+    _this.savedVolume = 0;
+    /**
+     * @private The current muted state
+     * @type {boolean}
+     */
+
+    _this.isMuted = false;
+    /**
+     * @private Will hold a list of event descriptors that need to be
+     * canceled on subsequent loads of audio
+     * @type {Object[]}
+     */
+
+    _this.tmpEvents = [];
+    /**
+     * @private Holds any running audio downloads
+     * @type {Observer}
+     */
+
+    _this.currentRequest = null;
+    /** @private */
+
+    _this.arraybuffer = null;
+    /** @private */
+
+    _this.drawer = null;
+    /** @private */
+
+    _this.backend = null;
+    /** @private */
+
+    _this.peakCache = null; // cache constructor objects
+
+    if (typeof _this.params.renderer !== 'function') {
+      throw new Error('Renderer parameter is invalid');
+    }
+    /**
+     * @private The uninitialised Drawer class
+     */
+
+
+    _this.Drawer = _this.params.renderer;
+    /**
+     * @private The uninitialised Backend class
+     */
+    // Back compat
+
+    if (_this.params.backend == 'AudioElement') {
+      _this.params.backend = 'MediaElement';
+    }
+
+    if ((_this.params.backend == 'WebAudio' || _this.params.backend === 'MediaElementWebAudio') && !_webaudio.default.prototype.supportsWebAudio.call(null)) {
+      _this.params.backend = 'MediaElement';
+    }
+
+    _this.Backend = _this.backends[_this.params.backend];
+    /**
+     * @private map of plugin names that are currently initialised
+     */
+
+    _this.initialisedPluginList = {};
+    /** @private */
+
+    _this.isDestroyed = false;
+    /**
+     * Get the current ready status.
+     *
+     * @example const isReady = wavesurfer.isReady;
+     * @return {boolean}
+     */
+
+    _this.isReady = false; // responsive debounced event listener. If this.params.responsive is not
+    // set, this is never called. Use 100ms or this.params.responsive as
+    // timeout for the debounce function.
+
+    var prevWidth = 0;
+    _this._onResize = util.debounce(function () {
+      if (prevWidth != _this.drawer.wrapper.clientWidth && !_this.params.scrollParent) {
+        prevWidth = _this.drawer.wrapper.clientWidth;
+
+        _this.drawer.fireEvent('redraw');
+      }
+    }, typeof _this.params.responsive === 'number' ? _this.params.responsive : 100);
+    return _possibleConstructorReturn(_this, _assertThisInitialized(_this));
+  }
+  /**
+   * Initialise the wave
+   *
+   * @example
+   * var wavesurfer = new WaveSurfer(params);
+   * wavesurfer.init();
+   * @return {this} The wavesurfer instance
+   */
+
+
+  _createClass(WaveSurfer, [{
+    key: "init",
+    value: function init() {
+      this.registerPlugins(this.params.plugins);
+      this.createDrawer();
+      this.createBackend();
+      this.createPeakCache();
+      return this;
+    }
+    /**
+     * Add and initialise array of plugins (if `plugin.deferInit` is falsey),
+     * this function is called in the init function of wavesurfer
+     *
+     * @param {PluginDefinition[]} plugins An array of plugin definitions
+     * @emits {WaveSurfer#plugins-registered} Called with the array of plugin definitions
+     * @return {this} The wavesurfer instance
+     */
+
+  }, {
+    key: "registerPlugins",
+    value: function registerPlugins(plugins) {
+      var _this2 = this;
+
+      // first instantiate all the plugins
+      plugins.forEach(function (plugin) {
+        return _this2.addPlugin(plugin);
+      }); // now run the init functions
+
+      plugins.forEach(function (plugin) {
+        // call init function of the plugin if deferInit is falsey
+        // in that case you would manually use initPlugins()
+        if (!plugin.deferInit) {
+          _this2.initPlugin(plugin.name);
+        }
+      });
+      this.fireEvent('plugins-registered', plugins);
+      return this;
+    }
+    /**
+     * Get a map of plugin names that are currently initialised
+     *
+     * @example wavesurfer.getPlugins();
+     * @return {Object} Object with plugin names
+     */
+
+  }, {
+    key: "getActivePlugins",
+    value: function getActivePlugins() {
+      return this.initialisedPluginList;
+    }
+    /**
+     * Add a plugin object to wavesurfer
+     *
+     * @param {PluginDefinition} plugin A plugin definition
+     * @emits {WaveSurfer#plugin-added} Called with the name of the plugin that was added
+     * @example wavesurfer.addPlugin(WaveSurfer.minimap());
+     * @return {this} The wavesurfer instance
+     */
+
+  }, {
+    key: "addPlugin",
+    value: function addPlugin(plugin) {
+      var _this3 = this;
+
+      if (!plugin.name) {
+        throw new Error('Plugin does not have a name!');
+      }
+
+      if (!plugin.instance) {
+        throw new Error("Plugin ".concat(plugin.name, " does not have an instance property!"));
+      } // staticProps properties are applied to wavesurfer instance
+
+
+      if (plugin.staticProps) {
+        Object.keys(plugin.staticProps).forEach(function (pluginStaticProp) {
+          /**
+           * Properties defined in a plugin definition's `staticProps` property are added as
+           * staticProps properties of the WaveSurfer instance
+           */
+          _this3[pluginStaticProp] = plugin.staticProps[pluginStaticProp];
+        });
+      }
+
+      var Instance = plugin.instance; // turn the plugin instance into an observer
+
+      var observerPrototypeKeys = Object.getOwnPropertyNames(util.Observer.prototype);
+      observerPrototypeKeys.forEach(function (key) {
+        Instance.prototype[key] = util.Observer.prototype[key];
+      });
+      /**
+       * Instantiated plugin classes are added as a property of the wavesurfer
+       * instance
+       * @type {Object}
+       */
+
+      this[plugin.name] = new Instance(plugin.params || {}, this);
+      this.fireEvent('plugin-added', plugin.name);
+      return this;
+    }
+    /**
+     * Initialise a plugin
+     *
+     * @param {string} name A plugin name
+     * @emits WaveSurfer#plugin-initialised
+     * @example wavesurfer.initPlugin('minimap');
+     * @return {this} The wavesurfer instance
+     */
+
+  }, {
+    key: "initPlugin",
+    value: function initPlugin(name) {
+      if (!this[name]) {
+        throw new Error("Plugin ".concat(name, " has not been added yet!"));
+      }
+
+      if (this.initialisedPluginList[name]) {
+        // destroy any already initialised plugins
+        this.destroyPlugin(name);
+      }
+
+      this[name].init();
+      this.initialisedPluginList[name] = true;
+      this.fireEvent('plugin-initialised', name);
+      return this;
+    }
+    /**
+     * Destroy a plugin
+     *
+     * @param {string} name A plugin name
+     * @emits WaveSurfer#plugin-destroyed
+     * @example wavesurfer.destroyPlugin('minimap');
+     * @returns {this} The wavesurfer instance
+     */
+
+  }, {
+    key: "destroyPlugin",
+    value: function destroyPlugin(name) {
+      if (!this[name]) {
+        throw new Error("Plugin ".concat(name, " has not been added yet and cannot be destroyed!"));
+      }
+
+      if (!this.initialisedPluginList[name]) {
+        throw new Error("Plugin ".concat(name, " is not active and cannot be destroyed!"));
+      }
+
+      if (typeof this[name].destroy !== 'function') {
+        throw new Error("Plugin ".concat(name, " does not have a destroy function!"));
+      }
+
+      this[name].destroy();
+      delete this.initialisedPluginList[name];
+      this.fireEvent('plugin-destroyed', name);
+      return this;
+    }
+    /**
+     * Destroy all initialised plugins. Convenience function to use when
+     * wavesurfer is removed
+     *
+     * @private
+     */
+
+  }, {
+    key: "destroyAllPlugins",
+    value: function destroyAllPlugins() {
+      var _this4 = this;
+
+      Object.keys(this.initialisedPluginList).forEach(function (name) {
+        return _this4.destroyPlugin(name);
+      });
+    }
+    /**
+     * Create the drawer and draw the waveform
+     *
+     * @private
+     * @emits WaveSurfer#drawer-created
+     */
+
+  }, {
+    key: "createDrawer",
+    value: function createDrawer() {
+      var _this5 = this;
+
+      this.drawer = new this.Drawer(this.container, this.params);
+      this.drawer.init();
+      this.fireEvent('drawer-created', this.drawer);
+
+      if (this.params.responsive !== false) {
+        window.addEventListener('resize', this._onResize, true);
+        window.addEventListener('orientationchange', this._onResize, true);
+      }
+
+      this.drawer.on('redraw', function () {
+        _this5.drawBuffer();
+
+        _this5.drawer.progress(_this5.backend.getPlayedPercents());
+      }); // Click-to-seek
+
+      this.drawer.on('click', function (e, progress) {
+        setTimeout(function () {
+          return _this5.seekTo(progress);
+        }, 0);
+      }); // Relay the scroll event from the drawer
+
+      this.drawer.on('scroll', function (e) {
+        if (_this5.params.partialRender) {
+          _this5.drawBuffer();
+        }
+
+        _this5.fireEvent('scroll', e);
+      });
+    }
+    /**
+     * Create the backend
+     *
+     * @private
+     * @emits WaveSurfer#backend-created
+     */
+
+  }, {
+    key: "createBackend",
+    value: function createBackend() {
+      var _this6 = this;
+
+      if (this.backend) {
+        this.backend.destroy();
+      }
+
+      this.backend = new this.Backend(this.params);
+      this.backend.init();
+      this.fireEvent('backend-created', this.backend);
+      this.backend.on('finish', function () {
+        _this6.drawer.progress(_this6.backend.getPlayedPercents());
+
+        _this6.fireEvent('finish');
+      });
+      this.backend.on('play', function () {
+        return _this6.fireEvent('play');
+      });
+      this.backend.on('pause', function () {
+        return _this6.fireEvent('pause');
+      });
+      this.backend.on('audioprocess', function (time) {
+        _this6.drawer.progress(_this6.backend.getPlayedPercents());
+
+        _this6.fireEvent('audioprocess', time);
+      }); // only needed for MediaElement and MediaElementWebAudio backend
+
+      if (this.params.backend === 'MediaElement' || this.params.backend === 'MediaElementWebAudio') {
+        this.backend.on('seek', function () {
+          _this6.drawer.progress(_this6.backend.getPlayedPercents());
+        });
+        this.backend.on('volume', function () {
+          var newVolume = _this6.getVolume();
+
+          _this6.fireEvent('volume', newVolume);
+
+          if (_this6.backend.isMuted !== _this6.isMuted) {
+            _this6.isMuted = _this6.backend.isMuted;
+
+            _this6.fireEvent('mute', _this6.isMuted);
+          }
+        });
+      }
+    }
+    /**
+     * Create the peak cache
+     *
+     * @private
+     */
+
+  }, {
+    key: "createPeakCache",
+    value: function createPeakCache() {
+      if (this.params.partialRender) {
+        this.peakCache = new _peakcache.default();
+      }
+    }
+    /**
+     * Get the duration of the audio clip
+     *
+     * @example const duration = wavesurfer.getDuration();
+     * @return {number} Duration in seconds
+     */
+
+  }, {
+    key: "getDuration",
+    value: function getDuration() {
+      return this.backend.getDuration();
+    }
+    /**
+     * Get the current playback position
+     *
+     * @example const currentTime = wavesurfer.getCurrentTime();
+     * @return {number} Playback position in seconds
+     */
+
+  }, {
+    key: "getCurrentTime",
+    value: function getCurrentTime() {
+      return this.backend.getCurrentTime();
+    }
+    /**
+     * Set the current play time in seconds.
+     *
+     * @param {number} seconds A positive number in seconds. E.g. 10 means 10
+     * seconds, 60 means 1 minute
+     */
+
+  }, {
+    key: "setCurrentTime",
+    value: function setCurrentTime(seconds) {
+      if (seconds >= this.getDuration()) {
+        this.seekTo(1);
+      } else {
+        this.seekTo(seconds / this.getDuration());
+      }
+    }
+    /**
+     * Starts playback from the current position. Optional start and end
+     * measured in seconds can be used to set the range of audio to play.
+     *
+     * @param {?number} start Position to start at
+     * @param {?number} end Position to end at
+     * @emits WaveSurfer#interaction
+     * @return {Promise} Result of the backend play method
+     * @example
+     * // play from second 1 to 5
+     * wavesurfer.play(1, 5);
+     */
+
+  }, {
+    key: "play",
+    value: function play(start, end) {
+      var _this7 = this;
+
+      this.fireEvent('interaction', function () {
+        return _this7.play(start, end);
+      });
+      return this.backend.play(start, end);
+    }
+    /**
+     * Set a point in seconds for playback to stop at.
+     *
+     * @param {number} position Position (in seconds) to stop at
+     * @version 3.3.0
+     */
+
+  }, {
+    key: "setPlayEnd",
+    value: function setPlayEnd(position) {
+      this.backend.setPlayEnd(position);
+    }
+    /**
+     * Stops and pauses playback
+     *
+     * @example wavesurfer.pause();
+     * @return {Promise} Result of the backend pause method
+     */
+
+  }, {
+    key: "pause",
+    value: function pause() {
+      if (!this.backend.isPaused()) {
+        return this.backend.pause();
+      }
+    }
+    /**
+     * Toggle playback
+     *
+     * @example wavesurfer.playPause();
+     * @return {Promise} Result of the backend play or pause method
+     */
+
+  }, {
+    key: "playPause",
+    value: function playPause() {
+      return this.backend.isPaused() ? this.play() : this.pause();
+    }
+    /**
+     * Get the current playback state
+     *
+     * @example const isPlaying = wavesurfer.isPlaying();
+     * @return {boolean} False if paused, true if playing
+     */
+
+  }, {
+    key: "isPlaying",
+    value: function isPlaying() {
+      return !this.backend.isPaused();
+    }
+    /**
+     * Skip backward
+     *
+     * @param {?number} seconds Amount to skip back, if not specified `skipLength`
+     * is used
+     * @example wavesurfer.skipBackward();
+     */
+
+  }, {
+    key: "skipBackward",
+    value: function skipBackward(seconds) {
+      this.skip(-seconds || -this.params.skipLength);
+    }
+    /**
+     * Skip forward
+     *
+     * @param {?number} seconds Amount to skip back, if not specified `skipLength`
+     * is used
+     * @example wavesurfer.skipForward();
+     */
+
+  }, {
+    key: "skipForward",
+    value: function skipForward(seconds) {
+      this.skip(seconds || this.params.skipLength);
+    }
+    /**
+     * Skip a number of seconds from the current position (use a negative value
+     * to go backwards).
+     *
+     * @param {number} offset Amount to skip back or forwards
+     * @example
+     * // go back 2 seconds
+     * wavesurfer.skip(-2);
+     */
+
+  }, {
+    key: "skip",
+    value: function skip(offset) {
+      var duration = this.getDuration() || 1;
+      var position = this.getCurrentTime() || 0;
+      position = Math.max(0, Math.min(duration, position + (offset || 0)));
+      this.seekAndCenter(position / duration);
+    }
+    /**
+     * Seeks to a position and centers the view
+     *
+     * @param {number} progress Between 0 (=beginning) and 1 (=end)
+     * @example
+     * // seek and go to the middle of the audio
+     * wavesurfer.seekTo(0.5);
+     */
+
+  }, {
+    key: "seekAndCenter",
+    value: function seekAndCenter(progress) {
+      this.seekTo(progress);
+      this.drawer.recenter(progress);
+    }
+    /**
+     * Seeks to a position
+     *
+     * @param {number} progress Between 0 (=beginning) and 1 (=end)
+     * @emits WaveSurfer#interaction
+     * @emits WaveSurfer#seek
+     * @example
+     * // seek to the middle of the audio
+     * wavesurfer.seekTo(0.5);
+     */
+
+  }, {
+    key: "seekTo",
+    value: function seekTo(progress) {
+      var _this8 = this;
+
+      // return an error if progress is not a number between 0 and 1
+      if (typeof progress !== 'number' || !isFinite(progress) || progress < 0 || progress > 1) {
+        throw new Error('Error calling wavesurfer.seekTo, parameter must be a number between 0 and 1!');
+      }
+
+      this.fireEvent('interaction', function () {
+        return _this8.seekTo(progress);
+      });
+      var isWebAudioBackend = this.params.backend === 'WebAudio';
+      var paused = this.backend.isPaused();
+
+      if (isWebAudioBackend && !paused) {
+        this.backend.pause();
+      } // avoid small scrolls while paused seeking
+
+
+      var oldScrollParent = this.params.scrollParent;
+      this.params.scrollParent = false;
+      this.backend.seekTo(progress * this.getDuration());
+      this.drawer.progress(progress);
+
+      if (isWebAudioBackend && !paused) {
+        this.backend.play();
+      }
+
+      this.params.scrollParent = oldScrollParent;
+      this.fireEvent('seek', progress);
+    }
+    /**
+     * Stops and goes to the beginning.
+     *
+     * @example wavesurfer.stop();
+     */
+
+  }, {
+    key: "stop",
+    value: function stop() {
+      this.pause();
+      this.seekTo(0);
+      this.drawer.progress(0);
+    }
+    /**
+     * Sets the ID of the audio device to use for output and returns a Promise.
+     *
+     * @param {string} deviceId String value representing underlying output
+     * device
+     * @returns {Promise} `Promise` that resolves to `undefined` when there are
+     * no errors detected.
+     */
+
+  }, {
+    key: "setSinkId",
+    value: function setSinkId(deviceId) {
+      this.sink_id = deviceId
+      return this.backend.setSinkId(deviceId);
+    }
+    /**
+     * Set the playback volume.
+     *
+     * @param {number} newVolume A value between 0 and 1, 0 being no
+     * volume and 1 being full volume.
+     * @emits WaveSurfer#volume
+     */
+
+  }, {
+    key: "setVolume",
+    value: function setVolume(newVolume) {
+      this.backend.setVolume(newVolume);
+      this.fireEvent('volume', newVolume);
+    }
+    /**
+     * Get the playback volume.
+     *
+     * @return {number} A value between 0 and 1, 0 being no
+     * volume and 1 being full volume.
+     */
+
+  }, {
+    key: "getVolume",
+    value: function getVolume() {
+      return this.backend.getVolume();
+    }
+    /**
+     * Set the playback rate.
+     *
+     * @param {number} rate A positive number. E.g. 0.5 means half the normal
+     * speed, 2 means double speed and so on.
+     * @example wavesurfer.setPlaybackRate(2);
+     */
+
+  }, {
+    key: "setPlaybackRate",
+    value: function setPlaybackRate(rate) {
+      this.backend.setPlaybackRate(rate);
+    }
+    /**
+     * Get the playback rate.
+     *
+     * @return {number} The current playback rate.
+     */
+
+  }, {
+    key: "getPlaybackRate",
+    value: function getPlaybackRate() {
+      return this.backend.getPlaybackRate();
+    }
+    /**
+     * Toggle the volume on and off. If not currently muted it will save the
+     * current volume value and turn the volume off. If currently muted then it
+     * will restore the volume to the saved value, and then rest the saved
+     * value.
+     *
+     * @example wavesurfer.toggleMute();
+     */
+
+  }, {
+    key: "toggleMute",
+    value: function toggleMute() {
+      this.setMute(!this.isMuted);
+    }
+    /**
+     * Enable or disable muted audio
+     *
+     * @param {boolean} mute Specify `true` to mute audio.
+     * @emits WaveSurfer#volume
+     * @emits WaveSurfer#mute
+     * @example
+     * // unmute
+     * wavesurfer.setMute(false);
+     * console.log(wavesurfer.getMute()) // logs false
+     */
+
+  }, {
+    key: "setMute",
+    value: function setMute(mute) {
+      // ignore all muting requests if the audio is already in that state
+      if (mute === this.isMuted) {
+        this.fireEvent('mute', this.isMuted);
+        return;
+      }
+
+      if (this.backend.setMute) {
+        // Backends such as the MediaElement backend have their own handling
+        // of mute, let them handle it.
+        this.backend.setMute(mute);
+        this.isMuted = mute;
+      } else {
+        if (mute) {
+          // If currently not muted then save current volume,
+          // turn off the volume and update the mute properties
+          this.savedVolume = this.backend.getVolume();
+          this.backend.setVolume(0);
+          this.isMuted = true;
+          this.fireEvent('volume', 0);
+        } else {
+          // If currently muted then restore to the saved volume
+          // and update the mute properties
+          this.backend.setVolume(this.savedVolume);
+          this.isMuted = false;
+          this.fireEvent('volume', this.savedVolume);
+        }
+      }
+
+      this.fireEvent('mute', this.isMuted);
+    }
+    /**
+     * Get the current mute status.
+     *
+     * @example const isMuted = wavesurfer.getMute();
+     * @return {boolean} Current mute status
+     */
+
+  }, {
+    key: "getMute",
+    value: function getMute() {
+      return this.isMuted;
+    }
+    /**
+     * Get the list of current set filters as an array.
+     *
+     * Filters must be set with setFilters method first
+     *
+     * @return {array} List of enabled filters
+     */
+
+  }, {
+    key: "getFilters",
+    value: function getFilters() {
+      return this.backend.filters || [];
+    }
+    /**
+     * Toggles `scrollParent` and redraws
+     *
+     * @example wavesurfer.toggleScroll();
+     */
+
+  }, {
+    key: "toggleScroll",
+    value: function toggleScroll() {
+      this.params.scrollParent = !this.params.scrollParent;
+      this.drawBuffer();
+    }
+    /**
+     * Toggle mouse interaction
+     *
+     * @example wavesurfer.toggleInteraction();
+     */
+
+  }, {
+    key: "toggleInteraction",
+    value: function toggleInteraction() {
+      this.params.interact = !this.params.interact;
+    }
+    /**
+     * Get the fill color of the waveform after the cursor.
+     *
+     * @return {string} A CSS color string.
+     */
+
+  }, {
+    key: "getWaveColor",
+    value: function getWaveColor() {
+      return this.params.waveColor;
+    }
+    /**
+     * Set the fill color of the waveform after the cursor.
+     *
+     * @param {string} color A CSS color string.
+     * @example wavesurfer.setWaveColor('#ddd');
+     */
+
+  }, {
+    key: "setWaveColor",
+    value: function setWaveColor(color) {
+      this.params.waveColor = color;
+      this.drawBuffer();
+    }
+    /**
+     * Get the fill color of the waveform behind the cursor.
+     *
+     * @return {string} A CSS color string.
+     */
+
+  }, {
+    key: "getProgressColor",
+    value: function getProgressColor() {
+      return this.params.progressColor;
+    }
+    /**
+     * Set the fill color of the waveform behind the cursor.
+     *
+     * @param {string} color A CSS color string.
+     * @example wavesurfer.setProgressColor('#400');
+     */
+
+  }, {
+    key: "setProgressColor",
+    value: function setProgressColor(color) {
+      this.params.progressColor = color;
+      this.drawBuffer();
+    }
+    /**
+     * Get the background color of the waveform container.
+     *
+     * @return {string} A CSS color string.
+     */
+
+  }, {
+    key: "getBackgroundColor",
+    value: function getBackgroundColor() {
+      return this.params.backgroundColor;
+    }
+    /**
+     * Set the background color of the waveform container.
+     *
+     * @param {string} color A CSS color string.
+     * @example wavesurfer.setBackgroundColor('#FF00FF');
+     */
+
+  }, {
+    key: "setBackgroundColor",
+    value: function setBackgroundColor(color) {
+      this.params.backgroundColor = color;
+      util.style(this.container, {
+        background: this.params.backgroundColor
+      });
+    }
+    /**
+     * Get the fill color of the cursor indicating the playhead
+     * position.
+     *
+     * @return {string} A CSS color string.
+     */
+
+  }, {
+    key: "getCursorColor",
+    value: function getCursorColor() {
+      return this.params.cursorColor;
+    }
+    /**
+     * Set the fill color of the cursor indicating the playhead
+     * position.
+     *
+     * @param {string} color A CSS color string.
+     * @example wavesurfer.setCursorColor('#222');
+     */
+
+  }, {
+    key: "setCursorColor",
+    value: function setCursorColor(color) {
+      this.params.cursorColor = color;
+      this.drawer.updateCursor();
+    }
+    /**
+     * Get the height of the waveform.
+     *
+     * @return {number} Height measured in pixels.
+     */
+
+  }, {
+    key: "getHeight",
+    value: function getHeight() {
+      return this.params.height;
+    }
+    /**
+     * Set the height of the waveform.
+     *
+     * @param {number} height Height measured in pixels.
+     * @example wavesurfer.setHeight(200);
+     */
+
+  }, {
+    key: "setHeight",
+    value: function setHeight(height) {
+      this.params.height = height;
+      this.drawer.setHeight(height * this.params.pixelRatio);
+      this.drawBuffer();
+    }
+    /**
+     * Hide channels from being drawn on the waveform if splitting channels.
+     *
+     * For example, if we want to draw only the peaks for the right stereo channel:
+     *
+     * const wavesurfer = new WaveSurfer.create({...splitChannels: true});
+     * wavesurfer.load('stereo_audio.mp3');
+     *
+     * wavesurfer.setFilteredChannel([0]); <-- hide left channel peaks.
+     *
+     * @param {array} channelIndices Channels to be filtered out from drawing.
+     * @version 4.0.0
+     */
+
+  }, {
+    key: "setFilteredChannels",
+    value: function setFilteredChannels(channelIndices) {
+      this.params.splitChannelsOptions.filterChannels = channelIndices;
+      this.drawBuffer();
+    }
+    /**
+     * Get the correct peaks for current wave view-port and render wave
+     *
+     * @private
+     * @emits WaveSurfer#redraw
+     */
+
+  }, {
+    key: "drawBuffer",
+    value: function drawBuffer() {
+      var nominalWidth = Math.round(this.getDuration() * this.params.minPxPerSec * this.params.pixelRatio);
+      var parentWidth = this.drawer.getWidth();
+      var width = nominalWidth; // always start at 0 after zooming for scrolling : issue redraw left part
+
+      var start = 0;
+      var end = Math.max(start + parentWidth, width); // Fill container
+
+      if (this.params.fillParent && (!this.params.scrollParent || nominalWidth < parentWidth)) {
+        width = parentWidth;
+        start = 0;
+        end = width;
+      }
+
+      var peaks;
+
+      if (this.params.partialRender) {
+        var newRanges = this.peakCache.addRangeToPeakCache(width, start, end);
+        var i;
+
+        for (i = 0; i < newRanges.length; i++) {
+          peaks = this.backend.getPeaks(width, newRanges[i][0], newRanges[i][1]);
+          this.drawer.drawPeaks(peaks, width, newRanges[i][0], newRanges[i][1]);
+        }
+      } else {
+        peaks = this.backend.getPeaks(width, start, end);
+        this.drawer.drawPeaks(peaks, width, start, end);
+      }
+
+      this.fireEvent('redraw', peaks, width);
+    }
+    /**
+     * Horizontally zooms the waveform in and out. It also changes the parameter
+     * `minPxPerSec` and enables the `scrollParent` option. Calling the function
+     * with a falsey parameter will reset the zoom state.
+     *
+     * @param {?number} pxPerSec Number of horizontal pixels per second of
+     * audio, if none is set the waveform returns to unzoomed state
+     * @emits WaveSurfer#zoom
+     * @example wavesurfer.zoom(20);
+     */
+
+  }, {
+    key: "zoom",
+    value: function zoom(pxPerSec) {
+      if (!pxPerSec) {
+        this.params.minPxPerSec = this.defaultParams.minPxPerSec;
+        this.params.scrollParent = false;
+      } else {
+        this.params.minPxPerSec = pxPerSec;
+        this.params.scrollParent = true;
+      }
+
+      this.drawBuffer();
+      this.drawer.progress(this.backend.getPlayedPercents());
+      this.drawer.recenter(this.getCurrentTime() / this.getDuration());
+      this.fireEvent('zoom', pxPerSec);
+    }
+    /**
+     * Decode buffer and load
+     *
+     * @private
+     * @param {ArrayBuffer} arraybuffer Buffer to process
+     */
+
+  }, {
+    key: "loadArrayBuffer",
+    value: function loadArrayBuffer(arraybuffer) {
+      var _this9 = this;
+
+      this.decodeArrayBuffer(arraybuffer, function (data) {
+        if (!_this9.isDestroyed) {
+          _this9.loadDecodedBuffer(data);
+        }
+      });
+    }
+    /**
+     * Directly load an externally decoded AudioBuffer
+     *
+     * @private
+     * @param {AudioBuffer} buffer Buffer to process
+     * @emits WaveSurfer#ready
+     */
+
+  }, {
+    key: "loadDecodedBuffer",
+    value: function loadDecodedBuffer(buffer) {
+      this.backend.load(buffer);
+      this.drawBuffer();
+      this.isReady = true;
+      this.fireEvent('ready');
+    }
+    /**
+     * Loads audio data from a Blob or File object
+     *
+     * @param {Blob|File} blob Audio data
+     * @example
+     */
+
+  }, {
+    key: "loadBlob",
+    value: function loadBlob(blob) {
+      var _this10 = this;
+
+      // Create file reader
+      var reader = new FileReader();
+      reader.addEventListener('progress', function (e) {
+        return _this10.onProgress(e);
+      });
+      reader.addEventListener('load', function (e) {
+        return _this10.loadArrayBuffer(e.target.result);
+      });
+      reader.addEventListener('error', function () {
+        return _this10.fireEvent('error', 'Error reading file');
+      });
+      reader.readAsArrayBuffer(blob);
+      this.empty();
+    }
+    /**
+     * Loads audio and re-renders the waveform.
+     *
+     * @param {string|HTMLMediaElement} url The url of the audio file or the
+     * audio element with the audio
+     * @param {number[]|Number.<Array[]>} peaks Wavesurfer does not have to decode
+     * the audio to render the waveform if this is specified
+     * @param {?string} preload (Use with backend `MediaElement` and `MediaElementWebAudio`)
+     * `'none'|'metadata'|'auto'` Preload attribute for the media element
+     * @param {?number} duration The duration of the audio. This is used to
+     * render the peaks data in the correct size for the audio duration (as
+     * befits the current `minPxPerSec` and zoom value) without having to decode
+     * the audio.
+     * @returns {void}
+     * @throws Will throw an error if the `url` argument is empty.
+     * @example
+     * // uses fetch or media element to load file (depending on backend)
+     * wavesurfer.load('http://example.com/demo.wav');
+     *
+     * // setting preload attribute with media element backend and supplying
+     * // peaks
+     * wavesurfer.load(
+     *   'http://example.com/demo.wav',
+     *   [0.0218, 0.0183, 0.0165, 0.0198, 0.2137, 0.2888],
+     *   true
+     * );
+     */
+
+  }, {
+    key: "load",
+    value: function load(url, peaks, preload, duration) {
+      if (!url) {
+        throw new Error('url parameter cannot be empty');
+      }
+
+      this.empty();
+
+      if (preload) {
+        // check whether the preload attribute will be usable and if not log
+        // a warning listing the reasons why not and nullify the variable
+        var preloadIgnoreReasons = {
+          "Preload is not 'auto', 'none' or 'metadata'": ['auto', 'metadata', 'none'].indexOf(preload) === -1,
+          'Peaks are not provided': !peaks,
+          "Backend is not of type 'MediaElement' or 'MediaElementWebAudio'": ['MediaElement', 'MediaElementWebAudio'].indexOf(this.params.backend) === -1,
+          'Url is not of type string': typeof url !== 'string'
+        };
+        var activeReasons = Object.keys(preloadIgnoreReasons).filter(function (reason) {
+          return preloadIgnoreReasons[reason];
+        });
+
+        if (activeReasons.length) {
+          // eslint-disable-next-line no-console
+          console.warn('Preload parameter of wavesurfer.load will be ignored because:\n\t- ' + activeReasons.join('\n\t- ')); // stop invalid values from being used
+
+          preload = null;
+        }
+      } // loadBuffer(url, peaks, duration) requires that url is a string
+      // but users can pass in a HTMLMediaElement to WaveSurfer
+
+
+      if (this.params.backend === 'WebAudio' && url instanceof HTMLMediaElement) {
+        url = url.src;
+      }
+
+      switch (this.params.backend) {
+        case 'WebAudio':
+          return this.loadBuffer(url, peaks, duration);
+
+        case 'MediaElement':
+        case 'MediaElementWebAudio':
+          return this.loadMediaElement(url, peaks, preload, duration);
+      }
+    }
+    /**
+     * Loads audio using Web Audio buffer backend.
+     *
+     * @private
+     * @emits WaveSurfer#waveform-ready
+     * @param {string} url URL of audio file
+     * @param {number[]|Number.<Array[]>} peaks Peaks data
+     * @param {?number} duration Optional duration of audio file
+     * @returns {void}
+     */
+
+  }, {
+    key: "loadBuffer",
+    value: function loadBuffer(url, peaks, duration) {
+      var _this11 = this;
+
+      var load = function load(action) {
+        if (action) {
+          _this11.tmpEvents.push(_this11.once('ready', action));
+        }
+
+        return _this11.getArrayBuffer(url, function (data) {
+          return _this11.loadArrayBuffer(data);
+        });
+      };
+
+      if (peaks) {
+        this.backend.setPeaks(peaks, duration);
+        this.drawBuffer();
+        this.fireEvent('waveform-ready');
+        this.tmpEvents.push(this.once('interaction', load));
+      } else {
+        return load();
+      }
+    }
+    /**
+     * Either create a media element, or load an existing media element.
+     *
+     * @private
+     * @emits WaveSurfer#waveform-ready
+     * @param {string|HTMLMediaElement} urlOrElt Either a path to a media file, or an
+     * existing HTML5 Audio/Video Element
+     * @param {number[]|Number.<Array[]>} peaks Array of peaks. Required to bypass web audio
+     * dependency
+     * @param {?boolean} preload Set to true if the preload attribute of the
+     * audio element should be enabled
+     * @param {?number} duration Optional duration of audio file
+     */
+
+  }, {
+    key: "loadMediaElement",
+    value: function loadMediaElement(urlOrElt, peaks, preload, duration) {
+      var _this12 = this;
+
+      var url = urlOrElt;
+
+      if (typeof urlOrElt === 'string') {
+        this.backend.load(url, this.mediaContainer, peaks, preload);
+      } else {
+        var elt = urlOrElt;
+        this.backend.loadElt(elt, peaks); // If peaks are not provided,
+        // url = element.src so we can get peaks with web audio
+
+        url = elt.src;
+      }
+
+      this.tmpEvents.push(this.backend.once('canplay', function () {
+        // ignore when backend was already destroyed
+        if (!_this12.backend.destroyed) {
+          _this12.drawBuffer();
+
+          _this12.isReady = true;
+
+          _this12.fireEvent('ready');
+        }
+      }), this.backend.once('error', function (err) {
+        return _this12.fireEvent('error', err);
+      })); // If peaks are provided, render them and fire the `waveform-ready` event.
+
+      if (peaks) {
+        this.backend.setPeaks(peaks, duration);
+        this.drawBuffer();
+        this.fireEvent('waveform-ready');
+      } // If no pre-decoded peaks are provided, or are provided with
+      // forceDecode flag, attempt to download the audio file and decode it
+      // with Web Audio.
+
+
+      if ((!peaks || this.params.forceDecode) && this.backend.supportsWebAudio()) {
+        this.getArrayBuffer(url, function (arraybuffer) {
+          _this12.decodeArrayBuffer(arraybuffer, function (buffer) {
+            _this12.backend.buffer = buffer;
+
+            _this12.backend.setPeaks(null);
+
+            _this12.drawBuffer();
+
+            _this12.fireEvent('waveform-ready');
+          });
+        });
+      }
+    }
+    /**
+     * Decode an array buffer and pass data to a callback
+     *
+     * @private
+     * @param {Object} arraybuffer The array buffer to decode
+     * @param {function} callback The function to call on complete
+     */
+
+  }, {
+    key: "decodeArrayBuffer",
+    value: function decodeArrayBuffer(arraybuffer, callback) {
+      var _this13 = this;
+
+      this.arraybuffer = arraybuffer;
+      this.backend.decodeArrayBuffer(arraybuffer, function (data) {
+        // Only use the decoded data if we haven't been destroyed or
+        // another decode started in the meantime
+        if (!_this13.isDestroyed && _this13.arraybuffer == arraybuffer) {
+          callback(data);
+          _this13.arraybuffer = null;
+        }
+      }, function () {
+        return _this13.fireEvent('error', 'Error decoding audiobuffer');
+      });
+    }
+    /**
+     * Load an array buffer using fetch and pass the result to a callback
+     *
+     * @param {string} url The URL of the file object
+     * @param {function} callback The function to call on complete
+     * @returns {util.fetchFile} fetch call
+     * @private
+     */
+
+  }, {
+    key: "getArrayBuffer",
+    value: function getArrayBuffer(url, callback) {
+      var _this14 = this;
+
+      var options = Object.assign({
+        url: url,
+        responseType: 'arraybuffer'
+      }, this.params.xhr);
+      var request = util.fetchFile(options);
+      this.currentRequest = request;
+      this.tmpEvents.push(request.on('progress', function (e) {
+        _this14.onProgress(e);
+      }), request.on('success', function (data) {
+        callback(data);
+        _this14.currentRequest = null;
+      }), request.on('error', function (e) {
+        _this14.fireEvent('error', e);
+
+        _this14.currentRequest = null;
+      }));
+      return request;
+    }
+    /**
+     * Called while the audio file is loading
+     *
+     * @private
+     * @param {Event} e Progress event
+     * @emits WaveSurfer#loading
+     */
+
+  }, {
+    key: "onProgress",
+    value: function onProgress(e) {
+      var percentComplete;
+
+      if (e.lengthComputable) {
+        percentComplete = e.loaded / e.total;
+      } else {
+        // Approximate progress with an asymptotic
+        // function, and assume downloads in the 1-3 MB range.
+        percentComplete = e.loaded / (e.loaded + 1000000);
+      }
+
+      this.fireEvent('loading', Math.round(percentComplete * 100), e.target);
+    }
+    /**
+     * Exports PCM data into a JSON array and optionally opens in a new window
+     * as valid JSON Blob instance.
+     *
+     * @param {number} length=1024 The scale in which to export the peaks
+     * @param {number} accuracy=10000
+     * @param {?boolean} noWindow Set to true to disable opening a new
+     * window with the JSON
+     * @param {number} start Start index
+     * @param {number} end End index
+     * @return {Promise} Promise that resolves with array of peaks
+     */
+
+  }, {
+    key: "exportPCM",
+    value: function exportPCM(length, accuracy, noWindow, start, end) {
+      length = length || 1024;
+      start = start || 0;
+      accuracy = accuracy || 10000;
+      noWindow = noWindow || false;
+      var peaks = this.backend.getPeaks(length, start, end);
+      var arr = [].map.call(peaks, function (val) {
+        return Math.round(val * accuracy) / accuracy;
+      });
+      return new Promise(function (resolve, reject) {
+        if (!noWindow) {
+          var blobJSON = new Blob([JSON.stringify(arr)], {
+            type: 'application/json;charset=utf-8'
+          });
+          var objURL = URL.createObjectURL(blobJSON);
+          window.open(objURL);
+          URL.revokeObjectURL(objURL);
+        }
+
+        resolve(arr);
+      });
+    }
+    /**
+     * Save waveform image as data URI.
+     *
+     * The default format is `'image/png'`. Other supported types are
+     * `'image/jpeg'` and `'image/webp'`.
+     *
+     * @param {string} format='image/png' A string indicating the image format.
+     * The default format type is `'image/png'`.
+     * @param {number} quality=1 A number between 0 and 1 indicating the image
+     * quality to use for image formats that use lossy compression such as
+     * `'image/jpeg'`` and `'image/webp'`.
+     * @param {string} type Image data type to return. Either 'dataURL' (default)
+     * or 'blob'.
+     * @return {string|string[]|Promise} When using `'dataURL'` type this returns
+     * a single data URL or an array of data URLs, one for each canvas. When using
+     * `'blob'` type this returns a `Promise` resolving with an array of `Blob`
+     * instances, one for each canvas.
+     */
+
+  }, {
+    key: "exportImage",
+    value: function exportImage(format, quality, type) {
+      if (!format) {
+        format = 'image/png';
+      }
+
+      if (!quality) {
+        quality = 1;
+      }
+
+      if (!type) {
+        type = 'dataURL';
+      }
+
+      return this.drawer.getImage(format, quality, type);
+    }
+    /**
+     * Cancel any fetch request currently in progress
+     */
+
+  }, {
+    key: "cancelAjax",
+    value: function cancelAjax() {
+      if (this.currentRequest && this.currentRequest.controller) {
+        // If the current request has a ProgressHandler, then its ReadableStream might need to be cancelled too
+        // See: Wavesurfer issue #2042
+        // See Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1583815
+        if (this.currentRequest._reader) {
+          // Ignoring exceptions thrown by call to cancel()
+          this.currentRequest._reader.cancel().catch(function (err) {});
+        }
+
+        this.currentRequest.controller.abort();
+        this.currentRequest = null;
+      }
+    }
+    /**
+     * @private
+     */
+
+  }, {
+    key: "clearTmpEvents",
+    value: function clearTmpEvents() {
+      this.tmpEvents.forEach(function (e) {
+        return e.un();
+      });
+    }
+    /**
+     * Display empty waveform.
+     */
+
+  }, {
+    key: "empty",
+    value: function empty() {
+      if (!this.backend.isPaused()) {
+        this.stop();
+        this.backend.disconnectSource();
+      }
+
+      this.isReady = false;
+      this.cancelAjax();
+      this.clearTmpEvents(); // empty drawer
+
+      this.drawer.progress(0);
+      this.drawer.setWidth(0);
+      this.drawer.drawPeaks({
+        length: this.drawer.getWidth()
+      }, 0);
+    }
+    /**
+     * Remove events, elements and disconnect WebAudio nodes.
+     *
+     * @emits WaveSurfer#destroy
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {
+      this.destroyAllPlugins();
+      this.fireEvent('destroy');
+      this.cancelAjax();
+      this.clearTmpEvents();
+      this.unAll();
+
+      if (this.params.responsive !== false) {
+        window.removeEventListener('resize', this._onResize, true);
+        window.removeEventListener('orientationchange', this._onResize, true);
+      }
+
+      if (this.backend) {
+        this.backend.destroy(); // clears memory usage
+
+        this.backend = null;
+      }
+
+      if (this.drawer) {
+        this.drawer.destroy();
+      }
+
+      this.isDestroyed = true;
+      this.isReady = false;
+      this.arraybuffer = null;
+    }
+  }], [{
+    key: "create",
+    value:
+    /** @private */
+
+    /** @private */
+
+    /**
+     * Instantiate this class, call its `init` function and returns it
+     *
+     * @param {WavesurferParams} params The wavesurfer parameters
+     * @return {Object} WaveSurfer instance
+     * @example const wavesurfer = WaveSurfer.create(params);
+     */
+    function create(params) {
+      var wavesurfer = new WaveSurfer(params);
+      return wavesurfer.init();
+    }
+    /**
+     * The library version number is available as a static property of the
+     * WaveSurfer class
+     *
+     * @type {String}
+     * @example
+     * console.log('Using wavesurfer.js ' + WaveSurfer.VERSION);
+     */
+
+  }]);
+
+  return WaveSurfer;
+}(util.Observer);
+
+exports.default = WaveSurfer;
+WaveSurfer.VERSION = "5.1.0";
+WaveSurfer.util = util;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./src/webaudio.js":
+/*!*************************!*\
+  !*** ./src/webaudio.js ***!
+  \*************************/
+/***/ ((module, exports, __webpack_require__) => {
+
+"use strict";
+
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.default = void 0;
+
+var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
+
+function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
+
+function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
+
+function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
+
+function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
+
+function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
+
+function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
+
+function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
+
+function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }
+
+function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
+
+// using constants to prevent someone writing the string wrong
+var PLAYING = 'playing';
+var PAUSED = 'paused';
+var FINISHED = 'finished';
+/**
+ * WebAudio backend
+ *
+ * @extends {Observer}
+ */
+
+var WebAudio = /*#__PURE__*/function (_util$Observer) {
+  _inherits(WebAudio, _util$Observer);
+
+  var _super = _createSuper(WebAudio);
+
+  /**
+   * Construct the backend
+   *
+   * @param {WavesurferParams} params Wavesurfer parameters
+   */
+  function WebAudio(params) {
+    var _this$stateBehaviors, _this$states;
+
+    var _this;
+
+    _classCallCheck(this, WebAudio);
+
+    _this = _super.call(this);
+    /** @private */
+
+    _this.audioContext = null;
+    _this.offlineAudioContext = null;
+    _this.stateBehaviors = (_this$stateBehaviors = {}, _defineProperty(_this$stateBehaviors, PLAYING, {
+      init: function init() {
+        this.addOnAudioProcess();
+      },
+      getPlayedPercents: function getPlayedPercents() {
+        var duration = this.getDuration();
+        return this.getCurrentTime() / duration || 0;
+      },
+      getCurrentTime: function getCurrentTime() {
+        return this.startPosition + this.getPlayedTime();
+      }
+    }), _defineProperty(_this$stateBehaviors, PAUSED, {
+      init: function init() {
+        this.removeOnAudioProcess();
+      },
+      getPlayedPercents: function getPlayedPercents() {
+        var duration = this.getDuration();
+        return this.getCurrentTime() / duration || 0;
+      },
+      getCurrentTime: function getCurrentTime() {
+        return this.startPosition;
+      }
+    }), _defineProperty(_this$stateBehaviors, FINISHED, {
+      init: function init() {
+        this.removeOnAudioProcess();
+        this.fireEvent('finish');
+      },
+      getPlayedPercents: function getPlayedPercents() {
+        return 1;
+      },
+      getCurrentTime: function getCurrentTime() {
+        return this.getDuration();
+      }
+    }), _this$stateBehaviors);
+    _this.params = params;
+    /** ac: Audio Context instance */
+
+    _this.ac = params.audioContext || (_this.supportsWebAudio() ? _this.getAudioContext() : {});
+    /**@private */
+
+    _this.lastPlay = _this.ac.currentTime;
+    /** @private */
+
+    _this.startPosition = 0;
+    /** @private */
+
+    _this.scheduledPause = null;
+    /** @private */
+
+    _this.states = (_this$states = {}, _defineProperty(_this$states, PLAYING, Object.create(_this.stateBehaviors[PLAYING])), _defineProperty(_this$states, PAUSED, Object.create(_this.stateBehaviors[PAUSED])), _defineProperty(_this$states, FINISHED, Object.create(_this.stateBehaviors[FINISHED])), _this$states);
+    /** @private */
+
+    _this.buffer = null;
+    /** @private */
+
+    _this.filters = [];
+    /** gainNode: allows to control audio volume */
+
+    _this.gainNode = null;
+    /** @private */
+
+    _this.mergedPeaks = null;
+    /** @private */
+
+    _this.offlineAc = null;
+    /** @private */
+
+    _this.peaks = null;
+    /** @private */
+
+    _this.playbackRate = 1;
+    /** analyser: provides audio analysis information */
+
+    _this.analyser = null;
+    /** scriptNode: allows processing audio */
+
+    _this.scriptNode = null;
+    /** @private */
+
+    _this.source = null;
+    /** @private */
+
+    _this.splitPeaks = [];
+    /** @private */
+
+    _this.state = null;
+    /** @private */
+
+    _this.explicitDuration = params.duration;
+    /**
+     * Boolean indicating if the backend was destroyed.
+     */
+
+    _this.destroyed = false;
+    return _this;
+  }
+  /**
+   * Initialise the backend, called in `wavesurfer.createBackend()`
+   */
+
+
+  _createClass(WebAudio, [{
+    key: "supportsWebAudio",
+    value:
+    /** scriptBufferSize: size of the processing buffer */
+
+    /** audioContext: allows to process audio with WebAudio API */
+
+    /** @private */
+
+    /** @private */
+
+    /**
+     * Does the browser support this backend
+     *
+     * @return {boolean} Whether or not this browser supports this backend
+     */
+    function supportsWebAudio() {
+      return !!(window.AudioContext || window.webkitAudioContext);
+    }
+    /**
+     * Get the audio context used by this backend or create one
+     *
+     * @return {AudioContext} Existing audio context, or creates a new one
+     */
+
+  }, {
+    key: "getAudioContext",
+    value: function getAudioContext() {
+      if (!window.WaveSurferAudioContext) {
+        window.WaveSurferAudioContext = new (window.AudioContext || window.webkitAudioContext)();
+      }
+
+      return window.WaveSurferAudioContext;
+    }
+    /**
+     * Get the offline audio context used by this backend or create one
+     *
+     * @param {number} sampleRate The sample rate to use
+     * @return {OfflineAudioContext} Existing offline audio context, or creates
+     * a new one
+     */
+
+  }, {
+    key: "getOfflineAudioContext",
+    value: function getOfflineAudioContext(sampleRate) {
+      if (!window.WaveSurferOfflineAudioContext) {
+        window.WaveSurferOfflineAudioContext = new (window.OfflineAudioContext || window.webkitOfflineAudioContext)(1, 2, sampleRate);
+      }
+
+      return window.WaveSurferOfflineAudioContext;
+    }
+  }, {
+    key: "init",
+    value: function init() {
+      this.createVolumeNode();
+      this.createScriptNode();
+      this.createAnalyserNode();
+      this.setState(PAUSED);
+      this.setPlaybackRate(this.params.audioRate);
+      this.setLength(0);
+    }
+    /** @private */
+
+  }, {
+    key: "disconnectFilters",
+    value: function disconnectFilters() {
+      if (this.filters) {
+        this.filters.forEach(function (filter) {
+          filter && filter.disconnect();
+        });
+        this.filters = null; // Reconnect direct path
+
+        this.analyser.connect(this.gainNode);
+      }
+    }
+    /**
+     * @private
+     *
+     * @param {string} state The new state
+     */
+
+  }, {
+    key: "setState",
+    value: function setState(state) {
+      if (this.state !== this.states[state]) {
+        this.state = this.states[state];
+        this.state.init.call(this);
+      }
+    }
+    /**
+     * Unpacked `setFilters()`
+     *
+     * @param {...AudioNode} filters One or more filters to set
+     */
+
+  }, {
+    key: "setFilter",
+    value: function setFilter() {
+      for (var _len = arguments.length, filters = new Array(_len), _key = 0; _key < _len; _key++) {
+        filters[_key] = arguments[_key];
+      }
+
+      this.setFilters(filters);
+    }
+    /**
+     * Insert custom Web Audio nodes into the graph
+     *
+     * @param {AudioNode[]} filters Packed filters array
+     * @example
+     * const lowpass = wavesurfer.backend.ac.createBiquadFilter();
+     * wavesurfer.backend.setFilter(lowpass);
+     */
+
+  }, {
+    key: "setFilters",
+    value: function setFilters(filters) {
+      // Remove existing filters
+      this.disconnectFilters(); // Insert filters if filter array not empty
+
+      if (filters && filters.length) {
+        this.filters = filters; // Disconnect direct path before inserting filters
+
+        this.analyser.disconnect(); // Connect each filter in turn
+
+        filters.reduce(function (prev, curr) {
+          prev.connect(curr);
+          return curr;
+        }, this.analyser).connect(this.gainNode);
+      }
+    }
+    /** Create ScriptProcessorNode to process audio */
+
+  }, {
+    key: "createScriptNode",
+    value: function createScriptNode() {
+      if (this.params.audioScriptProcessor) {
+        this.scriptNode = this.params.audioScriptProcessor;
+      } else {
+        if (this.ac.createScriptProcessor) {
+          this.scriptNode = this.ac.createScriptProcessor(WebAudio.scriptBufferSize);
+        } else {
+          this.scriptNode = this.ac.createJavaScriptNode(WebAudio.scriptBufferSize);
+        }
+      }
+
+      this.scriptNode.connect(this.ac.destination);
+    }
+    /** @private */
+
+  }, {
+    key: "addOnAudioProcess",
+    value: function addOnAudioProcess() {
+      var _this2 = this;
+
+      this.scriptNode.onaudioprocess = function () {
+        var time = _this2.getCurrentTime();
+
+        if (time >= _this2.getDuration()) {
+          _this2.setState(FINISHED);
+
+          _this2.fireEvent('pause');
+        } else if (time >= _this2.scheduledPause) {
+          _this2.pause();
+        } else if (_this2.state === _this2.states[PLAYING]) {
+          _this2.fireEvent('audioprocess', time);
+        }
+      };
+    }
+    /** @private */
+
+  }, {
+    key: "removeOnAudioProcess",
+    value: function removeOnAudioProcess() {
+      this.scriptNode.onaudioprocess = null;
+    }
+    /** Create analyser node to perform audio analysis */
+
+  }, {
+    key: "createAnalyserNode",
+    value: function createAnalyserNode() {
+      this.analyser = this.ac.createAnalyser();
+      this.analyser.connect(this.gainNode);
+    }
+    /**
+     * Create the gain node needed to control the playback volume.
+     *
+     */
+
+  }, {
+    key: "createVolumeNode",
+    value: function createVolumeNode() {
+      // Create gain node using the AudioContext
+      if (this.ac.createGain) {
+        this.gainNode = this.ac.createGain();
+      } else {
+        this.gainNode = this.ac.createGainNode();
+      } // Add the gain node to the graph
+
+
+      this.gainNode.connect(this.ac.destination);
+    }
+    /**
+     * Set the sink id for the media player
+     *
+     * @param {string} deviceId String value representing audio device id.
+     * @returns {Promise} A Promise that resolves to `undefined` when there
+     * are no errors.
+     */
+
+  }, {
+    key: "setSinkId",
+    value: function setSinkId(deviceId) {
+      if (deviceId) {
+        /**
+         * The webaudio API doesn't currently support setting the device
+         * output. Here we create an HTMLAudioElement, connect the
+         * webaudio stream to that element and setSinkId there.
+         */
+        var audio = new window.Audio();
+
+        if (!audio.setSinkId) {
+          return Promise.reject(new Error('setSinkId is not supported in your browser'));
+        }
+
+        audio.autoplay = true;
+        var dest = this.ac.createMediaStreamDestination();
+        this.gainNode.disconnect();
+        this.gainNode.connect(dest);
+        audio.srcObject = dest.stream;
+        return audio.setSinkId(deviceId);
+      } else {
+        return Promise.reject(new Error('Invalid deviceId: ' + deviceId));
+      }
+    }
+    /**
+     * Set the audio volume
+     *
+     * @param {number} value A floating point value between 0 and 1.
+     */
+
+  }, {
+    key: "setVolume",
+    value: function setVolume(value) {
+      this.gainNode.gain.setValueAtTime(value, this.ac.currentTime);
+    }
+    /**
+     * Get the current volume
+     *
+     * @return {number} value A floating point value between 0 and 1.
+     */
+
+  }, {
+    key: "getVolume",
+    value: function getVolume() {
+      return this.gainNode.gain.value;
+    }
+    /**
+     * Decode an array buffer and pass data to a callback
+     *
+     * @private
+     * @param {ArrayBuffer} arraybuffer The array buffer to decode
+     * @param {function} callback The function to call on complete.
+     * @param {function} errback The function to call on error.
+     */
+
+  }, {
+    key: "decodeArrayBuffer",
+    value: function decodeArrayBuffer(arraybuffer, callback, errback) {
+      if (!this.offlineAc) {
+        this.offlineAc = this.getOfflineAudioContext(this.ac && this.ac.sampleRate ? this.ac.sampleRate : 44100);
+      }
+
+      if ('webkitAudioContext' in window) {
+        // Safari: no support for Promise-based decodeAudioData enabled
+        // Enable it in Safari using the Experimental Features > Modern WebAudio API option
+        this.offlineAc.decodeAudioData(arraybuffer, function (data) {
+          return callback(data);
+        }, errback);
+      } else {
+        this.offlineAc.decodeAudioData(arraybuffer).then(function (data) {
+          return callback(data);
+        }).catch(function (err) {
+          return errback(err);
+        });
+      }
+    }
+    /**
+     * Set pre-decoded peaks
+     *
+     * @param {number[]|Number.<Array[]>} peaks Peaks data
+     * @param {?number} duration Explicit duration
+     */
+
+  }, {
+    key: "setPeaks",
+    value: function setPeaks(peaks, duration) {
+      if (duration != null) {
+        this.explicitDuration = duration;
+      }
+
+      this.peaks = peaks;
+    }
+    /**
+     * Set the rendered length (different from the length of the audio)
+     *
+     * @param {number} length The rendered length
+     */
+
+  }, {
+    key: "setLength",
+    value: function setLength(length) {
+      // No resize, we can preserve the cached peaks.
+      if (this.mergedPeaks && length == 2 * this.mergedPeaks.length - 1 + 2) {
+        return;
+      }
+
+      this.splitPeaks = [];
+      this.mergedPeaks = []; // Set the last element of the sparse array so the peak arrays are
+      // appropriately sized for other calculations.
+
+      var channels = this.buffer ? this.buffer.numberOfChannels : 1;
+      var c;
+
+      for (c = 0; c < channels; c++) {
+        this.splitPeaks[c] = [];
+        this.splitPeaks[c][2 * (length - 1)] = 0;
+        this.splitPeaks[c][2 * (length - 1) + 1] = 0;
+      }
+
+      this.mergedPeaks[2 * (length - 1)] = 0;
+      this.mergedPeaks[2 * (length - 1) + 1] = 0;
+    }
+    /**
+     * Compute the max and min value of the waveform when broken into <length> subranges.
+     *
+     * @param {number} length How many subranges to break the waveform into.
+     * @param {number} first First sample in the required range.
+     * @param {number} last Last sample in the required range.
+     * @return {number[]|Number.<Array[]>} Array of 2*<length> peaks or array of arrays of
+     * peaks consisting of (max, min) values for each subrange.
+     */
+
+  }, {
+    key: "getPeaks",
+    value: function getPeaks(length, first, last) {
+      if (this.peaks) {
+        return this.peaks;
+      }
+
+      if (!this.buffer) {
+        return [];
+      }
+
+      first = first || 0;
+      last = last || length - 1;
+      this.setLength(length);
+
+      if (!this.buffer) {
+        return this.params.splitChannels ? this.splitPeaks : this.mergedPeaks;
+      }
+      /**
+       * The following snippet fixes a buffering data issue on the Safari
+       * browser which returned undefined It creates the missing buffer based
+       * on 1 channel, 4096 samples and the sampleRate from the current
+       * webaudio context 4096 samples seemed to be the best fit for rendering
+       * will review this code once a stable version of Safari TP is out
+       */
+
+
+      if (!this.buffer.length) {
+        var newBuffer = this.createBuffer(1, 4096, this.sampleRate);
+        this.buffer = newBuffer.buffer;
+      }
+
+      var sampleSize = this.buffer.length / length;
+      var sampleStep = ~~(sampleSize / 10) || 1;
+      var channels = this.buffer.numberOfChannels;
+      var c;
+
+      for (c = 0; c < channels; c++) {
+        var peaks = this.splitPeaks[c];
+        var chan = this.buffer.getChannelData(c);
+        var i = void 0;
+
+        for (i = first; i <= last; i++) {
+          var start = ~~(i * sampleSize);
+          var end = ~~(start + sampleSize);
+          /**
+           * Initialize the max and min to the first sample of this
+           * subrange, so that even if the samples are entirely
+           * on one side of zero, we still return the true max and
+           * min values in the subrange.
+           */
+
+          var min = chan[start];
+          var max = min;
+          var j = void 0;
+
+          for (j = start; j < end; j += sampleStep) {
+            var value = chan[j];
+
+            if (value > max) {
+              max = value;
+            }
+
+            if (value < min) {
+              min = value;
+            }
+          }
+
+          peaks[2 * i] = max;
+          peaks[2 * i + 1] = min;
+
+          if (c == 0 || max > this.mergedPeaks[2 * i]) {
+            this.mergedPeaks[2 * i] = max;
+          }
+
+          if (c == 0 || min < this.mergedPeaks[2 * i + 1]) {
+            this.mergedPeaks[2 * i + 1] = min;
+          }
+        }
+      }
+
+      return this.params.splitChannels ? this.splitPeaks : this.mergedPeaks;
+    }
+    /**
+     * Get the position from 0 to 1
+     *
+     * @return {number} Position
+     */
+
+  }, {
+    key: "getPlayedPercents",
+    value: function getPlayedPercents() {
+      return this.state.getPlayedPercents.call(this);
+    }
+    /** @private */
+
+  }, {
+    key: "disconnectSource",
+    value: function disconnectSource() {
+      if (this.source) {
+        this.source.disconnect();
+      }
+    }
+    /**
+     * Destroy all references with WebAudio, disconnecting audio nodes and closing Audio Context
+     */
+
+  }, {
+    key: "destroyWebAudio",
+    value: function destroyWebAudio() {
+      this.disconnectFilters();
+      this.disconnectSource();
+      this.gainNode.disconnect();
+      this.scriptNode.disconnect();
+      this.analyser.disconnect(); // close the audioContext if closeAudioContext option is set to true
+
+      if (this.params.closeAudioContext) {
+        // check if browser supports AudioContext.close()
+        if (typeof this.ac.close === 'function' && this.ac.state != 'closed') {
+          this.ac.close();
+        } // clear the reference to the audiocontext
+
+
+        this.ac = null; // clear the actual audiocontext, either passed as param or the
+        // global singleton
+
+        if (!this.params.audioContext) {
+          window.WaveSurferAudioContext = null;
+        } else {
+          this.params.audioContext = null;
+        } // clear the offlineAudioContext
+
+
+        window.WaveSurferOfflineAudioContext = null;
+      }
+    }
+    /**
+     * This is called when wavesurfer is destroyed
+     */
+
+  }, {
+    key: "destroy",
+    value: function destroy() {
+      if (!this.isPaused()) {
+        this.pause();
+      }
+
+      this.unAll();
+      this.buffer = null;
+      this.destroyed = true;
+      this.destroyWebAudio();
+    }
+    /**
+     * Loaded a decoded audio buffer
+     *
+     * @param {Object} buffer Decoded audio buffer to load
+     */
+
+  }, {
+    key: "load",
+    value: function load(buffer) {
+      this.startPosition = 0;
+      this.lastPlay = this.ac.currentTime;
+      this.buffer = buffer;
+      this.createSource();
+    }
+    /** @private */
+
+  }, {
+    key: "createSource",
+    value: function createSource() {
+      this.disconnectSource();
+      this.source = this.ac.createBufferSource(); // adjust for old browsers
+
+      this.source.start = this.source.start || this.source.noteGrainOn;
+      this.source.stop = this.source.stop || this.source.noteOff;
+      this.setPlaybackRate(this.playbackRate);
+      this.source.buffer = this.buffer;
+      this.source.connect(this.analyser);
+    }
+    /**
+     * @private
+     *
+     * some browsers require an explicit call to #resume before they will play back audio
+     */
+
+  }, {
+    key: "resumeAudioContext",
+    value: function resumeAudioContext() {
+      if (this.ac.state == 'suspended') {
+        this.ac.resume && this.ac.resume();
+      }
+    }
+    /**
+     * Used by `wavesurfer.isPlaying()` and `wavesurfer.playPause()`
+     *
+     * @return {boolean} Whether or not this backend is currently paused
+     */
+
+  }, {
+    key: "isPaused",
+    value: function isPaused() {
+      return this.state !== this.states[PLAYING];
+    }
+    /**
+     * Used by `wavesurfer.getDuration()`
+     *
+     * @return {number} Duration of loaded buffer
+     */
+
+  }, {
+    key: "getDuration",
+    value: function getDuration() {
+      if (this.explicitDuration) {
+        return this.explicitDuration;
+      }
+
+      if (!this.buffer) {
+        return 0;
+      }
+
+      return this.buffer.duration;
+    }
+    /**
+     * Used by `wavesurfer.seekTo()`
+     *
+     * @param {number} start Position to start at in seconds
+     * @param {number} end Position to end at in seconds
+     * @return {{start: number, end: number}} Object containing start and end
+     * positions
+     */
+
+  }, {
+    key: "seekTo",
+    value: function seekTo(start, end) {
+      if (!this.buffer) {
+        return;
+      }
+
+      this.scheduledPause = null;
+
+      if (start == null) {
+        start = this.getCurrentTime();
+
+        if (start >= this.getDuration()) {
+          start = 0;
+        }
+      }
+
+      if (end == null) {
+        end = this.getDuration();
+      }
+
+      this.startPosition = start;
+      this.lastPlay = this.ac.currentTime;
+
+      if (this.state === this.states[FINISHED]) {
+        this.setState(PAUSED);
+      }
+
+      return {
+        start: start,
+        end: end
+      };
+    }
+    /**
+     * Get the playback position in seconds
+     *
+     * @return {number} The playback position in seconds
+     */
+
+  }, {
+    key: "getPlayedTime",
+    value: function getPlayedTime() {
+      return (this.ac.currentTime - this.lastPlay) * this.playbackRate;
+    }
+    /**
+     * Plays the loaded audio region.
+     *
+     * @param {number} start Start offset in seconds, relative to the beginning
+     * of a clip.
+     * @param {number} end When to stop relative to the beginning of a clip.
+     */
+
+  }, {
+    key: "play",
+    value: function play(start, end) {
+      if (!this.buffer) {
+        return;
+      } // need to re-create source on each playback
+
+
+      this.createSource();
+      var adjustedTime = this.seekTo(start, end);
+      start = adjustedTime.start;
+      end = adjustedTime.end;
+      this.scheduledPause = end;
+      this.source.start(0, start);
+      this.resumeAudioContext();
+      this.setState(PLAYING);
+      this.fireEvent('play');
+    }
+    /**
+     * Pauses the loaded audio.
+     */
+
+  }, {
+    key: "pause",
+    value: function pause() {
+      this.scheduledPause = null;
+      this.startPosition += this.getPlayedTime();
+      this.source && this.source.stop(0);
+      this.setState(PAUSED);
+      this.fireEvent('pause');
+    }
+    /**
+     * Returns the current time in seconds relative to the audio-clip's
+     * duration.
+     *
+     * @return {number} The current time in seconds
+     */
+
+  }, {
+    key: "getCurrentTime",
+    value: function getCurrentTime() {
+      return this.state.getCurrentTime.call(this);
+    }
+    /**
+     * Returns the current playback rate. (0=no playback, 1=normal playback)
+     *
+     * @return {number} The current playback rate
+     */
+
+  }, {
+    key: "getPlaybackRate",
+    value: function getPlaybackRate() {
+      return this.playbackRate;
+    }
+    /**
+     * Set the audio source playback rate.
+     *
+     * @param {number} value The playback rate to use
+     */
+
+  }, {
+    key: "setPlaybackRate",
+    value: function setPlaybackRate(value) {
+      this.playbackRate = value || 1;
+      this.source && this.source.playbackRate.setValueAtTime(this.playbackRate, this.ac.currentTime);
+    }
+    /**
+     * Set a point in seconds for playback to stop at.
+     *
+     * @param {number} end Position to end at
+     * @version 3.3.0
+     */
+
+  }, {
+    key: "setPlayEnd",
+    value: function setPlayEnd(end) {
+      this.scheduledPause = end;
+    }
+  }]);
+
+  return WebAudio;
+}(util.Observer);
+
+exports.default = WebAudio;
+WebAudio.scriptBufferSize = 256;
+module.exports = exports.default;
+
+/***/ }),
+
+/***/ "./node_modules/debounce/index.js":
+/*!****************************************!*\
+  !*** ./node_modules/debounce/index.js ***!
+  \****************************************/
+/***/ ((module) => {
+
+/**
+ * Returns a function, that, as long as it continues to be invoked, will not
+ * be triggered. The function will be called after it stops being called for
+ * N milliseconds. If `immediate` is passed, trigger the function on the
+ * leading edge, instead of the trailing. The function also has a property 'clear'
+ * that is a function which will clear the timer to prevent previously scheduled executions.
+ *
+ * @source underscore.js
+ * @see http://unscriptable.com/2009/03/20/debouncing-javascript-methods/
+ * @param {Function} function to wrap
+ * @param {Number} timeout in ms (`100`)
+ * @param {Boolean} whether to execute at the beginning (`false`)
+ * @api public
+ */
+function debounce(func, wait, immediate){
+  var timeout, args, context, timestamp, result;
+  if (null == wait) wait = 100;
+
+  function later() {
+    var last = Date.now() - timestamp;
+
+    if (last < wait && last >= 0) {
+      timeout = setTimeout(later, wait - last);
+    } else {
+      timeout = null;
+      if (!immediate) {
+        result = func.apply(context, args);
+        context = args = null;
+      }
+    }
+  };
+
+  var debounced = function(){
+    context = this;
+    args = arguments;
+    timestamp = Date.now();
+    var callNow = immediate && !timeout;
+    if (!timeout) timeout = setTimeout(later, wait);
+    if (callNow) {
+      result = func.apply(context, args);
+      context = args = null;
+    }
+
+    return result;
+  };
+
+  debounced.clear = function() {
+    if (timeout) {
+      clearTimeout(timeout);
+      timeout = null;
+    }
+  };
+
+  debounced.flush = function() {
+    if (timeout) {
+      result = func.apply(context, args);
+      context = args = null;
+
+      clearTimeout(timeout);
+      timeout = null;
+    }
+  };
+
+  return debounced;
+};
+
+// Adds compatibility for ES modules
+debounce.debounce = debounce;
+
+module.exports = debounce;
+
+
+/***/ })
+
+/******/ 	});
+/************************************************************************/
+/******/ 	// The module cache
+/******/ 	var __webpack_module_cache__ = {};
+/******/
+/******/ 	// The require function
+/******/ 	function __webpack_require__(moduleId) {
+/******/ 		// Check if module is in cache
+/******/ 		var cachedModule = __webpack_module_cache__[moduleId];
+/******/ 		if (cachedModule !== undefined) {
+/******/ 			return cachedModule.exports;
+/******/ 		}
+/******/ 		// Create a new module (and put it into the cache)
+/******/ 		var module = __webpack_module_cache__[moduleId] = {
+/******/ 			// no module.id needed
+/******/ 			// no module.loaded needed
+/******/ 			exports: {}
+/******/ 		};
+/******/
+/******/ 		// Execute the module function
+/******/ 		__webpack_modules__[moduleId](module, module.exports, __webpack_require__);
+/******/
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+/************************************************************************/
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+/******/ 	// startup
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+/******/ 	var __webpack_exports__ = __webpack_require__("./src/wavesurfer.js");
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+/******/ 	return __webpack_exports__;
+/******/ })()
+;
+});
+//# sourceMappingURL=wavesurfer.js.map
\ No newline at end of file