text: if (typeof navigator !== 'undefined') {
  /*!
   * wavesurfer.js 3.3.1 (2020-01-14)
   * https://github.com/katspaugh/wavesurfer.js
   * @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();
  })(window, function() {
  return /******/ (function(modules) { // webpackBootstrap
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  /******/ 			return installedModules[moduleId].exports;
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  /***/ "./node_modules/debounce/index.js":
  /*!****************************************!*\
    !*** ./node_modules/debounce/index.js ***!
    \****************************************/
  /*! no static exports found */
  /***/ (function(module, exports) {
  
  /**
   * 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;
  
  
  /***/ }),
  
  /***/ "./src/drawer.canvasentry.js":
  /*!***********************************!*\
    !*** ./src/drawer.canvasentry.js ***!
    \***********************************/
  /*! no static exports found */
  /***/ (function(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}
       * @private
       */
  
      this.start = 0;
      /**
       * End of the area the canvas should render, between 0 and 1
       *
       * @type {number}
       * @private
       */
  
      this.end = 1;
      /**
       * Unique identifier for this entry
       *
       * @type {string}
       */
  
      this.id = (0, _getId.default)(this.constructor.name.toLowerCase() + '_');
      /**
       * 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;
        }
      }
      /**
       * 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
       *
       * @private
       * @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
       *
       * @private
       * @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
       *
       * @private
       * @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 ***!
    \***********************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = void 0;
  
  var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
  
  function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (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 _typeof(obj) { 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); }
  
  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 _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 _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  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); }
  
  /**
   * Parent class for renderers
   *
   * @extends {Observer}
   */
  var Drawer =
  /*#__PURE__*/
  function (_util$Observer) {
    _inherits(Drawer, _util$Observer);
  
    /**
     * @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 = _possibleConstructorReturn(this, _getPrototypeOf(Drawer).call(this));
      /** @private */
  
      _this.container = container;
      /**
       * @type {WavesurferParams}
       * @private
       */
  
      _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;
      /** @private */
  
      _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 = this.container.appendChild(document.createElement('wave'));
        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 = e.targetTouches ? e.targetTouches[0].clientX : e.clientX;
        var bbox = this.wrapper.getBoundingClientRect();
        var nominalWidth = this.width;
        var parentWidth = this.getWidth();
        var progress;
  
        if (!this.params.fillParent && nominalWidth < parentWidth) {
          progress = (this.params.rtl ? bbox.right - clientX : clientX - bbox.left) * (this.params.pixelRatio / nominalWidth) || 0;
  
          if (progress > 1) {
            progress = 1;
          }
        } else {
          progress = ((this.params.rtl ? bbox.right - clientX : clientX - bbox.left) + this.wrapper.scrollLeft) / this.wrapper.scrollWidth || 0;
        }
  
        return progress;
      }
      /**
       * @private
       */
  
    }, {
      key: "setupWrapperEvents",
      value: function setupWrapperEvents() {
        var _this2 = this;
  
        this.wrapper.addEventListener('click', function (e) {
          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 (e.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 {
          this.style(this.wrapper, {
            width: ~~(this.width / this.params.pixelRatio) + 'px'
          });
        }
  
        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) {
            this.container.removeChild(this.wrapper);
          }
  
          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 ***!
    \***********************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  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() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (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 _typeof(obj) { 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); }
  
  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 _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 _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  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); }
  
  /**
   * 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);
  
    /**
     * @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 = _possibleConstructorReturn(this, _getPrototypeOf(MultiCanvas).call(this, container, params));
      /**
       * @type {number}
       * @private
       */
  
      _this.maxCanvasWidth = params.maxCanvasWidth;
      /**
       * @private
       * @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;
      /**
       * @private
       * @type {number}
       */
  
      _this.halfPixel = 0.5 / params.pixelRatio;
      /**
       * List of `CanvasEntry` instances.
       *
       * @private
       * @type {Array}
       */
  
      _this.canvases = [];
      /**
       * @private
       * @type {HTMLElement}
       */
  
      _this.progressWave = null;
      /**
       * Class used to generate entries.
       *
       * @private
       * @type {function}
       */
  
      _this.EntryClass = _drawer2.default;
      /**
       * Canvas 2d context attributes.
       *
       * @private
       * @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
       *
       * @private
       * @type {number}
       */
  
      _this.barRadius = params.barRadius || 0;
      return _this;
    }
    /**
     * Initialize the drawer
     */
  
  
    _createClass(MultiCanvas, [{
      key: "init",
      value: function init() {
        this.createWrapper();
        this.createElements();
      }
      /**
       * Create the canvas elements and style them
       *
       * @private
       */
  
    }, {
      key: "createElements",
      value: function createElements() {
        this.progressWave = this.wrapper.appendChild(this.style(document.createElement('wave'), {
          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
       *
       * @private
       */
  
    }, {
      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
  
        entry.initWave(this.wrapper.appendChild(this.style(document.createElement('canvas'), {
          position: 'absolute',
          zIndex: 2,
          left: leftOffset + 'px',
          top: 0,
          bottom: 0,
          height: '100%',
          pointerEvents: 'none'
        }))); // progress
  
        if (this.hasProgressCanvas) {
          entry.initProgress(this.progressWave.appendChild(this.style(document.createElement('canvas'), {
            position: 'absolute',
            left: leftOffset + 'px',
            top: 0,
            bottom: 0,
            height: '100%'
          })));
        }
  
        this.canvases.push(entry);
      }
      /**
       * Pop single canvas from the list
       *
       * @private
       */
  
    }, {
      key: "removeCanvas",
      value: function removeCanvas() {
        var lastEntry = this.canvases[this.canvases.length - 1]; // wave
  
        lastEntry.wave.parentElement.removeChild(lastEntry.wave); // progress
  
        if (this.hasProgressCanvas) {
          lastEntry.progress.parentElement.removeChild(lastEntry.progress);
        } // cleanup
  
  
        if (lastEntry) {
          lastEntry.destroy();
          lastEntry = null;
        }
  
        this.canvases.pop();
      }
      /**
       * Update the dimensions of a canvas element
       *
       * @private
       * @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() {
        this.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 _this3 = 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;
  
          // 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 = _this3.params.barWidth * _this3.params.pixelRatio;
          var gap = _this3.params.barGap === null ? Math.max(_this3.params.pixelRatio, ~~(bar / 2)) : Math.max(_this3.params.pixelRatio, _this3.params.barGap * _this3.params.pixelRatio);
          var step = bar + gap;
          var scale = length / _this3.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 && _this3.params.barMinHeight) h = _this3.params.barMinHeight;
  
            _this3.fillRect(i + _this3.halfPixel, halfH - h + offsetY, bar + _this3.halfPixel, h * 2, _this3.barRadius);
          }
        });
      }
      /**
       * 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 _this4 = 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;
  
          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) {
            _this4.drawLine(peaks, absmax, halfH, offsetY, start, end);
          } // always draw a median line
  
  
          _this4.fillRect(0, halfH + offsetY - _this4.halfPixel, _this4.width, _this4.halfPixel, _this4.barRadius);
        });
      }
      /**
       * Tell the canvas entries to render their portion of the waveform
       *
       * @private
       * @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
       */
  
    }, {
      key: "drawLine",
      value: function drawLine(peaks, absmax, halfH, offsetY, start, end) {
        var _this5 = this;
  
        this.canvases.forEach(function (entry) {
          _this5.setFillStyles(entry);
  
          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
       */
  
    }, {
      key: "fillRect",
      value: function fillRect(x, y, width, height, radius) {
        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) {
            this.setFillStyles(entry);
            entry.fillRects(intersection.x1 - leftOffset, intersection.y1, intersection.x2 - intersection.x1, intersection.y2 - intersection.y1, radius);
          }
        }
      }
      /**
       * Performs preparation tasks and calculations which are shared by `drawBars`
       * and `drawWave`
       *
       * @private
       * @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`
       * @returns {void}
       */
  
    }, {
      key: "prepareDraw",
      value: function prepareDraw(peaks, channelIndex, start, end, fn) {
        var _this6 = this;
  
        return util.frame(function () {
          // Split channels and call this function with the channelIndex set
          if (peaks[0] instanceof Array) {
            var channels = peaks;
  
            if (_this6.params.splitChannels) {
              _this6.setHeight(channels.length * _this6.params.height * _this6.params.pixelRatio);
  
              return channels.forEach(function (channelPeaks, i) {
                return _this6.prepareDraw(channelPeaks, i, start, end, fn);
              });
            }
  
            peaks = channels[0];
          } // calculate maximum modulation value, either from the barHeight
          // parameter or if normalize=true from the largest value in the peak
          // set
  
  
          var absmax = 1 / _this6.params.barHeight;
  
          if (_this6.params.normalize) {
            var max = util.max(peaks);
            var min = util.min(peaks);
            absmax = -min > max ? -min : max;
          } // 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 = _this6.params.height * _this6.params.pixelRatio;
          var offsetY = height * channelIndex || 0;
          var halfH = height / 2;
          return fn({
            absmax: absmax,
            hasMinVals: hasMinVals,
            height: height,
            offsetY: offsetY,
            halfH: halfH,
            peaks: peaks
          });
        })();
      }
      /**
       * Set the fill styles for a certain entry (wave and progress)
       *
       * @private
       * @param {CanvasEntry} entry Target entry
       */
  
    }, {
      key: "setFillStyles",
      value: function setFillStyles(entry) {
        entry.setFillStyles(this.params.waveColor, this.params.progressColor);
      }
      /**
       * 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 ***!
    \**************************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  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 _typeof(obj) { 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); }
  
  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 _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 _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 _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  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); }
  
  /**
   * MediaElementWebAudio backend: allows to load audio as HTML5 audio tag and use it with WebAudio API.
   * Setting the MediaElementWebAudio backend, there is the possibility to load audio of big dimensions, using the WebAudio API features.
   * The audio to load is an HTML5 audio tag, so you have to use the same methods of MediaElement backend for loading and playback.
   * In this way, the audio resource is not loaded entirely from server, but in ranges, since you load an HTML5 audio tag.
   * In this way, filters and other functionalities can be performed like with WebAudio backend, but without decoding
   * internally audio data, that caused crashing of the browser. You have to give also peaks, so the audio data are not decoded.
   *
   * @since 3.2.0
   */
  var MediaElementWebAudio =
  /*#__PURE__*/
  function (_MediaElement) {
    _inherits(MediaElementWebAudio, _MediaElement);
  
    /**
     * Construct the backend
     *
     * @param {WavesurferParams} params Wavesurfer parameters
     */
    function MediaElementWebAudio(params) {
      var _this;
  
      _classCallCheck(this, MediaElementWebAudio);
  
      _this = _possibleConstructorReturn(this, _getPrototypeOf(MediaElementWebAudio).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
       * @private
       */
  
    }, {
      key: "_load",
      value: function _load(media, peaks) {
        _get(_getPrototypeOf(MediaElementWebAudio.prototype), "_load", this).call(this, media, peaks);
  
        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);
      }
    }]);
  
    return MediaElementWebAudio;
  }(_mediaelement.default);
  
  exports.default = MediaElementWebAudio;
  module.exports = exports.default;
  
  /***/ }),
  
  /***/ "./src/mediaelement.js":
  /*!*****************************!*\
    !*** ./src/mediaelement.js ***!
    \*****************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  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() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (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 _typeof(obj) { 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); }
  
  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 _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 _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 _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  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); }
  
  /**
   * MediaElement backend
   */
  var MediaElement =
  /*#__PURE__*/
  function (_WebAudio) {
    _inherits(MediaElement, _WebAudio);
  
    /**
     * Construct the backend
     *
     * @param {WavesurferParams} params Wavesurfer parameters
     */
    function MediaElement(params) {
      var _this;
  
      _classCallCheck(this, MediaElement);
  
      _this = _possibleConstructorReturn(this, _getPrototypeOf(MediaElement).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);
      }
      /**
       * 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);
      }
      /**
       * 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
       * @throws Will throw an error if the `media` argument is not a valid media
       * element.
       * @private
       */
  
    }, {
      key: "_load",
      value: function _load(media, peaks) {
        // 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
  
  
        if (typeof media.load == 'function') {
          // 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;
        }
      }
      /**
       * 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 ***!
    \**************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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/ajax.js":
  /*!**************************!*\
    !*** ./src/util/ajax.js ***!
    \**************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = ajax;
  
  var _observer = _interopRequireDefault(__webpack_require__(/*! ./observer */ "./src/util/observer.js"));
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  /**
   * Perform an ajax request using `XMLHttpRequest`.
   *
   * @deprecated Use `util.fetchFile` instead.
   *
   * @param {Object} options AJAX options to use. See example below for options.
   * @returns {Observer} Observer instance
   * @example
   * // default options
   * let options = {
   *     method: 'GET',
   *     url: undefined,
   *     responseType: 'json',
   *     xhr: {}
   * };
   *
   * // override default options
   * options.url = '../media/demo.wav';
   * options.responseType = 'arraybuffer';
   * options.xhr = {
   *     requestHeaders: [
   *         {
   *             key: 'Authorization',
   *             value: 'my-token'
   *         }
   *     ],
   *     withCredentials: true
   * };
   *
   * // make ajax call
   * let ajaxCall = util.ajax(options);
   * ajaxCall.on('progress', e => {
   *     console.log('progress', e);
   * });
   * ajaxCall.on('success', (data, e) => {
   *     console.log('success!', data);
   * });
   * ajaxCall.on('error', e => {
   *     console.warn('ajax error: ' + e.target.statusText);
   * });
   */
  function ajax(options) {
    var instance = new _observer.default();
    var xhr = new XMLHttpRequest();
    var fired100 = false;
    xhr.open(options.method || 'GET', options.url, true);
    xhr.responseType = options.responseType || 'json';
  
    if (options.xhr) {
      if (options.xhr.requestHeaders) {
        // add custom request headers
        options.xhr.requestHeaders.forEach(function (header) {
          xhr.setRequestHeader(header.key, header.value);
        });
      }
  
      if (options.xhr.withCredentials) {
        // use credentials
        xhr.withCredentials = true;
      }
    }
  
    xhr.addEventListener('progress', function (e) {
      instance.fireEvent('progress', e);
  
      if (e.lengthComputable && e.loaded == e.total) {
        fired100 = true;
      }
    });
    xhr.addEventListener('load', function (e) {
      if (!fired100) {
        instance.fireEvent('progress', e);
      }
  
      instance.fireEvent('load', e);
  
      if (200 == xhr.status || 206 == xhr.status) {
        instance.fireEvent('success', xhr.response, e);
      } else {
        instance.fireEvent('error', e);
      }
    });
    xhr.addEventListener('error', function (e) {
      return instance.fireEvent('error', e);
    });
    xhr.send();
    instance.xhr = xhr;
    return instance;
  }
  
  module.exports = exports.default;
  
  /***/ }),
  
  /***/ "./src/util/extend.js":
  /*!****************************!*\
    !*** ./src/util/extend.js ***!
    \****************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = extend;
  
  /**
   * Extend an object shallowly with others
   *
   * @param {Object} dest The target object
   * @param {Object[]} sources The objects to use for extending
   *
   * @return {Object} Merged object
   * @deprecated since version 3.3.0
   */
  function extend(dest) {
    console.warn('util.extend is deprecated; use Object.assign instead');
  
    for (var _len = arguments.length, sources = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      sources[_key - 1] = arguments[_key];
    }
  
    sources.forEach(function (source) {
      Object.keys(source).forEach(function (key) {
        dest[key] = source[key];
      });
    });
    return dest;
  }
  
  module.exports = exports.default;
  
  /***/ }),
  
  /***/ "./src/util/fetch.js":
  /*!***************************!*\
    !*** ./src/util/fetch.js ***!
    \***************************/
  /*! no static exports found */
  /***/ (function(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);
   * });
   */
  
  
  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
  
    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 ***!
    \***************************/
  /*! no static exports found */
  /***/ (function(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 ***!
    \****************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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 ***!
    \***************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  Object.defineProperty(exports, "ajax", {
    enumerable: true,
    get: function get() {
      return _ajax.default;
    }
  });
  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, "Observer", {
    enumerable: true,
    get: function get() {
      return _observer.default;
    }
  });
  Object.defineProperty(exports, "extend", {
    enumerable: true,
    get: function get() {
      return _extend.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;
    }
  });
  
  var _ajax = _interopRequireDefault(__webpack_require__(/*! ./ajax */ "./src/util/ajax.js"));
  
  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 _observer = _interopRequireDefault(__webpack_require__(/*! ./observer */ "./src/util/observer.js"));
  
  var _extend = _interopRequireDefault(__webpack_require__(/*! ./extend */ "./src/util/extend.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"));
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  /***/ }),
  
  /***/ "./src/util/max.js":
  /*!*************************!*\
    !*** ./src/util/max.js ***!
    \*************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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 ***!
    \*************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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 ***!
    \******************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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.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);
      }
      /**
       * 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) {
          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/prevent-click.js":
  /*!***********************************!*\
    !*** ./src/util/prevent-click.js ***!
    \***********************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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 ***!
    \*********************************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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 ***!
    \***************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "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 ***!
    \***************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  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() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (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 _typeof(obj) { 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); }
  
  function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
  
  function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
  
  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 _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: true} 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 {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',
   *     headers: [
   *         {
   *             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.
   */
  
  /**
   * @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 () {
    _createClass(PluginClass, [{
      key: "create",
  
      /**
       * 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)
       */
      value: function create(params) {}
      /**
       * 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: "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);
  
    _createClass(WaveSurfer, null, [{
      key: "create",
  
      /** @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);
       */
      value: 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);
       */
  
    }]);
  
    /**
     * 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 = _possibleConstructorReturn(this, _getPrototypeOf(WaveSurfer).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: true
        },
        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,
        waveColor: '#999',
        xhr: {}
      };
      _this.backends = {
        MediaElement: _mediaelement.default,
        WebAudio: _webaudio.default,
        MediaElementWebAudio: _mediaelementWebaudio.default
      };
      _this.util = util;
      _this.params = Object.assign({}, _this.defaultParams, params);
      /** @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) {
        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 paused = this.backend.isPaused(); // avoid draw wrong position while playing backward seeking
  
        if (!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 (!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) {
        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 (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();
      }
      /**
       * 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;
          }
        }
  
        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
       * @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.tmpEvents.push(this.once('interaction', load));
        } else {
          return load();
        }
      }
      /**
       * Either create a media element, or load an existing media element.
       *
       * @private
       * @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 no pre-decoded peaks provided or pre-decoded peaks are
        // provided with forceDecode flag, attempt to download the
        // audio file and decode it with Web Audio.
  
        if (peaks) {
          this.backend.setPeaks(peaks, duration);
        }
  
        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 opens in a new window.
       *
       * @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) {
          var json = JSON.stringify(arr);
  
          if (!noWindow) {
            window.open('data:application/json;charset=utf-8,' + encodeURIComponent(json));
          }
  
          resolve(json);
        });
      }
      /**
       * 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) {
          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();
        }
  
        if (this.drawer) {
          this.drawer.destroy();
        }
  
        this.isDestroyed = true;
        this.isReady = false;
        this.arraybuffer = null;
      }
    }]);
  
    return WaveSurfer;
  }(util.Observer);
  
  exports.default = WaveSurfer;
  WaveSurfer.VERSION = "3.3.1";
  WaveSurfer.util = util;
  module.exports = exports.default;
  
  /***/ }),
  
  /***/ "./src/webaudio.js":
  /*!*************************!*\
    !*** ./src/webaudio.js ***!
    \*************************/
  /*! no static exports found */
  /***/ (function(module, exports, __webpack_require__) {
  
  "use strict";
  
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = void 0;
  
  var util = _interopRequireWildcard(__webpack_require__(/*! ./util */ "./src/util/index.js"));
  
  function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (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 _typeof(obj) { 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); }
  
  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 _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 _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  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); }
  
  // 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);
  
    _createClass(WebAudio, [{
      key: "supportsWebAudio",
  
      /** 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
       */
      value: 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;
      }
      /**
       * Construct the backend
       *
       * @param {WavesurferParams} params Wavesurfer parameters
       */
  
    }]);
  
    function WebAudio(params) {
      var _this$stateBehaviors, _this$states;
  
      var _this;
  
      _classCallCheck(this, WebAudio);
  
      _this = _possibleConstructorReturn(this, _getPrototypeOf(WebAudio).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: "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 = function () {};
      }
      /** 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);
        }
  
        this.offlineAc.decodeAudioData(arraybuffer, function (data) {
          return callback(data);
        }, errback);
      }
      /**
       * 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);
            var min = 0;
            var max = 0;
            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();
        }
      }
      /**
       * 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.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;
        }
      }
      /**
       * 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.source.playbackRate.setValueAtTime(this.playbackRate, this.ac.currentTime);
        this.source.buffer = this.buffer;
        this.source.connect(this.analyser);
      }
      /**
       * 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);
  
        if (this.ac.state == 'suspended') {
          this.ac.resume && this.ac.resume();
        }
  
        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) {
        value = value || 1;
  
        if (this.isPaused()) {
          this.playbackRate = value;
        } else {
          this.pause();
          this.playbackRate = value;
          this.play();
        }
      }
      /**
       * 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;
  
  /***/ })
  
  /******/ });
  });
  //# sourceMappingURL=wavesurfer.js.map
  
  }
  