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IN NO EVENT SHALL THE\n// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN\n// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\n// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar util = require('util/');\nvar hasOwn = Object.prototype.hasOwnProperty;\nvar pSlice = Array.prototype.slice;\nvar functionsHaveNames = (function () {\n  return function foo() {}.name === 'foo';\n}());\nfunction pToString (obj) {\n  return Object.prototype.toString.call(obj);\n}\nfunction isView(arrbuf) {\n  if (isBuffer(arrbuf)) {\n    return false;\n  }\n  if (typeof global.ArrayBuffer !== 'function') {\n    return false;\n  }\n  if (typeof ArrayBuffer.isView === 'function') {\n    return ArrayBuffer.isView(arrbuf);\n  }\n  if (!arrbuf) {\n    return false;\n  }\n  if (arrbuf instanceof DataView) {\n    return true;\n  }\n  if (arrbuf.buffer && arrbuf.buffer instanceof ArrayBuffer) {\n    return true;\n  }\n  return false;\n}\n// 1. The assert module provides functions that throw\n// AssertionError's when particular conditions are not met. The\n// assert module must conform to the following interface.\n\nvar assert = module.exports = ok;\n\n// 2. The AssertionError is defined in assert.\n// new assert.AssertionError({ message: message,\n//                             actual: actual,\n//                             expected: expected })\n\nvar regex = /\\s*function\\s+([^\\(\\s]*)\\s*/;\n// based on https://github.com/ljharb/function.prototype.name/blob/adeeeec8bfcc6068b187d7d9fb3d5bb1d3a30899/implementation.js\nfunction getName(func) {\n  if (!util.isFunction(func)) {\n    return;\n  }\n  if (functionsHaveNames) {\n    return func.name;\n  }\n  var str = func.toString();\n  var match = str.match(regex);\n  return match && match[1];\n}\nassert.AssertionError = function AssertionError(options) {\n  this.name = 'AssertionError';\n  this.actual = options.actual;\n  this.expected = options.expected;\n  this.operator = options.operator;\n  if (options.message) {\n    this.message = options.message;\n    this.generatedMessage = false;\n  } else {\n    this.message = getMessage(this);\n    this.generatedMessage = true;\n  }\n  var stackStartFunction = options.stackStartFunction || fail;\n  if (Error.captureStackTrace) {\n    Error.captureStackTrace(this, stackStartFunction);\n  } else {\n    // non v8 browsers so we can have a stacktrace\n    var err = new Error();\n    if (err.stack) {\n      var out = err.stack;\n\n      // try to strip useless frames\n      var fn_name = getName(stackStartFunction);\n      var idx = out.indexOf('\\n' + fn_name);\n      if (idx >= 0) {\n        // once we have located the function frame\n        // we need to strip out everything before it (and its line)\n        var next_line = out.indexOf('\\n', idx + 1);\n        out = out.substring(next_line + 1);\n      }\n\n      this.stack = out;\n    }\n  }\n};\n\n// assert.AssertionError instanceof Error\nutil.inherits(assert.AssertionError, Error);\n\nfunction truncate(s, n) {\n  if (typeof s === 'string') {\n    return s.length < n ? s : s.slice(0, n);\n  } else {\n    return s;\n  }\n}\nfunction inspect(something) {\n  if (functionsHaveNames || !util.isFunction(something)) {\n    return util.inspect(something);\n  }\n  var rawname = getName(something);\n  var name = rawname ? ': ' + rawname : '';\n  return '[Function' +  name + ']';\n}\nfunction getMessage(self) {\n  return truncate(inspect(self.actual), 128) + ' ' +\n         self.operator + ' ' +\n         truncate(inspect(self.expected), 128);\n}\n\n// At present only the three keys mentioned above are used and\n// understood by the spec. Implementations or sub modules can pass\n// other keys to the AssertionError's constructor - they will be\n// ignored.\n\n// 3. All of the following functions must throw an AssertionError\n// when a corresponding condition is not met, with a message that\n// may be undefined if not provided.  All assertion methods provide\n// both the actual and expected values to the assertion error for\n// display purposes.\n\nfunction fail(actual, expected, message, operator, stackStartFunction) {\n  throw new assert.AssertionError({\n    message: message,\n    actual: actual,\n    expected: expected,\n    operator: operator,\n    stackStartFunction: stackStartFunction\n  });\n}\n\n// EXTENSION! allows for well behaved errors defined elsewhere.\nassert.fail = fail;\n\n// 4. Pure assertion tests whether a value is truthy, as determined\n// by !!guard.\n// assert.ok(guard, message_opt);\n// This statement is equivalent to assert.equal(true, !!guard,\n// message_opt);. To test strictly for the value true, use\n// assert.strictEqual(true, guard, message_opt);.\n\nfunction ok(value, message) {\n  if (!value) fail(value, true, message, '==', assert.ok);\n}\nassert.ok = ok;\n\n// 5. The equality assertion tests shallow, coercive equality with\n// ==.\n// assert.equal(actual, expected, message_opt);\n\nassert.equal = function equal(actual, expected, message) {\n  if (actual != expected) fail(actual, expected, message, '==', assert.equal);\n};\n\n// 6. The non-equality assertion tests for whether two objects are not equal\n// with != assert.notEqual(actual, expected, message_opt);\n\nassert.notEqual = function notEqual(actual, expected, message) {\n  if (actual == expected) {\n    fail(actual, expected, message, '!=', assert.notEqual);\n  }\n};\n\n// 7. The equivalence assertion tests a deep equality relation.\n// assert.deepEqual(actual, expected, message_opt);\n\nassert.deepEqual = function deepEqual(actual, expected, message) {\n  if (!_deepEqual(actual, expected, false)) {\n    fail(actual, expected, message, 'deepEqual', assert.deepEqual);\n  }\n};\n\nassert.deepStrictEqual = function deepStrictEqual(actual, expected, message) {\n  if (!_deepEqual(actual, expected, true)) {\n    fail(actual, expected, message, 'deepStrictEqual', assert.deepStrictEqual);\n  }\n};\n\nfunction _deepEqual(actual, expected, strict, memos) {\n  // 7.1. All identical values are equivalent, as determined by ===.\n  if (actual === expected) {\n    return true;\n  } else if (isBuffer(actual) && isBuffer(expected)) {\n    return compare(actual, expected) === 0;\n\n  // 7.2. If the expected value is a Date object, the actual value is\n  // equivalent if it is also a Date object that refers to the same time.\n  } else if (util.isDate(actual) && util.isDate(expected)) {\n    return actual.getTime() === expected.getTime();\n\n  // 7.3 If the expected value is a RegExp object, the actual value is\n  // equivalent if it is also a RegExp object with the same source and\n  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).\n  } else if (util.isRegExp(actual) && util.isRegExp(expected)) {\n    return actual.source === expected.source &&\n           actual.global === expected.global &&\n           actual.multiline === expected.multiline &&\n           actual.lastIndex === expected.lastIndex &&\n           actual.ignoreCase === expected.ignoreCase;\n\n  // 7.4. Other pairs that do not both pass typeof value == 'object',\n  // equivalence is determined by ==.\n  } else if ((actual === null || typeof actual !== 'object') &&\n             (expected === null || typeof expected !== 'object')) {\n    return strict ? actual === expected : actual == expected;\n\n  // If both values are instances of typed arrays, wrap their underlying\n  // ArrayBuffers in a Buffer each to increase performance\n  // This optimization requires the arrays to have the same type as checked by\n  // Object.prototype.toString (aka pToString). Never perform binary\n  // comparisons for Float*Arrays, though, since e.g. +0 === -0 but their\n  // bit patterns are not identical.\n  } else if (isView(actual) && isView(expected) &&\n             pToString(actual) === pToString(expected) &&\n             !(actual instanceof Float32Array ||\n               actual instanceof Float64Array)) {\n    return compare(new Uint8Array(actual.buffer),\n                   new Uint8Array(expected.buffer)) === 0;\n\n  // 7.5 For all other Object pairs, including Array objects, equivalence is\n  // determined by having the same number of owned properties (as verified\n  // with Object.prototype.hasOwnProperty.call), the same set of keys\n  // (although not necessarily the same order), equivalent values for every\n  // corresponding key, and an identical 'prototype' property. Note: this\n  // accounts for both named and indexed properties on Arrays.\n  } else if (isBuffer(actual) !== isBuffer(expected)) {\n    return false;\n  } else {\n    memos = memos || {actual: [], expected: []};\n\n    var actualIndex = memos.actual.indexOf(actual);\n    if (actualIndex !== -1) {\n      if (actualIndex === memos.expected.indexOf(expected)) {\n        return true;\n      }\n    }\n\n    memos.actual.push(actual);\n    memos.expected.push(expected);\n\n    return objEquiv(actual, expected, strict, memos);\n  }\n}\n\nfunction isArguments(object) {\n  return Object.prototype.toString.call(object) == '[object Arguments]';\n}\n\nfunction objEquiv(a, b, strict, actualVisitedObjects) {\n  if (a === null || a === undefined || b === null || b === undefined)\n    return false;\n  // if one is a primitive, the other must be same\n  if (util.isPrimitive(a) || util.isPrimitive(b))\n    return a === b;\n  if (strict && Object.getPrototypeOf(a) !== Object.getPrototypeOf(b))\n    return false;\n  var aIsArgs = isArguments(a);\n  var bIsArgs = isArguments(b);\n  if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))\n    return false;\n  if (aIsArgs) {\n    a = pSlice.call(a);\n    b = pSlice.call(b);\n    return _deepEqual(a, b, strict);\n  }\n  var ka = objectKeys(a);\n  var kb = objectKeys(b);\n  var key, i;\n  // having the same number of owned properties (keys incorporates\n  // hasOwnProperty)\n  if (ka.length !== kb.length)\n    return false;\n  //the same set of keys (although not necessarily the same order),\n  ka.sort();\n  kb.sort();\n  //~~~cheap key test\n  for (i = ka.length - 1; i >= 0; i--) {\n    if (ka[i] !== kb[i])\n      return false;\n  }\n  //equivalent values for every corresponding key, and\n  //~~~possibly expensive deep test\n  for (i = ka.length - 1; i >= 0; i--) {\n    key = ka[i];\n    if (!_deepEqual(a[key], b[key], strict, actualVisitedObjects))\n      return false;\n  }\n  return true;\n}\n\n// 8. The non-equivalence assertion tests for any deep inequality.\n// assert.notDeepEqual(actual, expected, message_opt);\n\nassert.notDeepEqual = function notDeepEqual(actual, expected, message) {\n  if (_deepEqual(actual, expected, false)) {\n    fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);\n  }\n};\n\nassert.notDeepStrictEqual = notDeepStrictEqual;\nfunction notDeepStrictEqual(actual, expected, message) {\n  if (_deepEqual(actual, expected, true)) {\n    fail(actual, expected, message, 'notDeepStrictEqual', notDeepStrictEqual);\n  }\n}\n\n\n// 9. The strict equality assertion tests strict equality, as determined by ===.\n// assert.strictEqual(actual, expected, message_opt);\n\nassert.strictEqual = function strictEqual(actual, expected, message) {\n  if (actual !== expected) {\n    fail(actual, expected, message, '===', assert.strictEqual);\n  }\n};\n\n// 10. The strict non-equality assertion tests for strict inequality, as\n// determined by !==.  assert.notStrictEqual(actual, expected, message_opt);\n\nassert.notStrictEqual = function notStrictEqual(actual, expected, message) {\n  if (actual === expected) {\n    fail(actual, expected, message, '!==', assert.notStrictEqual);\n  }\n};\n\nfunction expectedException(actual, expected) {\n  if (!actual || !expected) {\n    return false;\n  }\n\n  if (Object.prototype.toString.call(expected) == '[object RegExp]') {\n    return expected.test(actual);\n  }\n\n  try {\n    if (actual instanceof expected) {\n      return true;\n    }\n  } catch (e) {\n    // Ignore.  The instanceof check doesn't work for arrow functions.\n  }\n\n  if (Error.isPrototypeOf(expected)) {\n    return false;\n  }\n\n  return expected.call({}, actual) === true;\n}\n\nfunction _tryBlock(block) {\n  var error;\n  try {\n    block();\n  } catch (e) {\n    error = e;\n  }\n  return error;\n}\n\nfunction _throws(shouldThrow, block, expected, message) {\n  var actual;\n\n  if (typeof block !== 'function') {\n    throw new TypeError('\"block\" argument must be a function');\n  }\n\n  if (typeof expected === 'string') {\n    message = expected;\n    expected = null;\n  }\n\n  actual = _tryBlock(block);\n\n  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +\n            (message ? ' ' + message : '.');\n\n  if (shouldThrow && !actual) {\n    fail(actual, expected, 'Missing expected exception' + message);\n  }\n\n  var userProvidedMessage = typeof message === 'string';\n  var isUnwantedException = !shouldThrow && util.isError(actual);\n  var isUnexpectedException = !shouldThrow && actual && !expected;\n\n  if ((isUnwantedException &&\n      userProvidedMessage &&\n      expectedException(actual, expected)) ||\n      isUnexpectedException) {\n    fail(actual, expected, 'Got unwanted exception' + message);\n  }\n\n  if ((shouldThrow && actual && expected &&\n      !expectedException(actual, expected)) || (!shouldThrow && actual)) {\n    throw actual;\n  }\n}\n\n// 11. Expected to throw an error:\n// assert.throws(block, Error_opt, message_opt);\n\nassert.throws = function(block, /*optional*/error, /*optional*/message) {\n  _throws(true, block, error, message);\n};\n\n// EXTENSION! This is annoying to write outside this module.\nassert.doesNotThrow = function(block, /*optional*/error, /*optional*/message) {\n  _throws(false, block, error, message);\n};\n\nassert.ifError = function(err) { if (err) throw err; };\n\n// Expose a strict only variant of assert\nfunction strict(value, message) {\n  if (!value) fail(value, true, message, '==', strict);\n}\nassert.strict = objectAssign(strict, assert, {\n  equal: assert.strictEqual,\n  deepEqual: assert.deepStrictEqual,\n  notEqual: assert.notStrictEqual,\n  notDeepEqual: assert.notDeepStrictEqual\n});\nassert.strict.strict = assert.strict;\n\nvar objectKeys = Object.keys || function (obj) {\n  var keys = [];\n  for (var key in obj) {\n    if (hasOwn.call(obj, key)) keys.push(key);\n  }\n  return keys;\n};\n","module.exports = require('./src/dct.js');\n","/*===========================================================================*\\\n * Discrete Cosine Transform\n *\n * (c) Vail Systems. Joshua Jung and Ben Bryan. 2015\n *\n * This code is not designed to be highly optimized but as an educational\n * tool to understand the Mel-scale and its related coefficients used in\n * human speech analysis.\n\\*===========================================================================*/\nvar cosMap = null;\n\n// Builds a cosine map for the given input size. This allows multiple input sizes to be memoized automagically\n// if you want to run the DCT over and over.\nvar memoizeCosines = function(N) {\n  cosMap = cosMap || {};\n  cosMap[N] = new Array(N*N);\n\n  var PI_N = Math.PI / N;\n\n  for (var k = 0; k < N; k++) {\n    for (var n = 0; n < N; n++) {\n      cosMap[N][n + (k * N)] = Math.cos(PI_N * (n + 0.5) * k);\n    }\n  }\n};\n\nfunction dct(signal, scale) {\n  var L = signal.length;\n  scale = scale || 2;\n\n  if (!cosMap || !cosMap[L]) memoizeCosines(L);\n\n  var coefficients = signal.map(function () {return 0;});\n\n  return coefficients.map(function (__, ix) {\n    return scale * signal.reduce(function (prev, cur, ix_, arr) {\n      return prev + (cur * cosMap[L][ix_ + (ix * L)]);\n    }, 0);\n  });\n};\n\nmodule.exports = dct;\n","'use strict';\n\nvar utils = require('./utils');\n\n// real to complex fft\nvar fft = function fft(signal) {\n\n  var complexSignal = {};\n\n  if (signal.real === undefined || signal.imag === undefined) {\n    complexSignal = utils.constructComplexArray(signal);\n  } else {\n    complexSignal.real = signal.real.slice();\n    complexSignal.imag = signal.imag.slice();\n  }\n\n  var N = complexSignal.real.length;\n  var logN = Math.log2(N);\n\n  if (Math.round(logN) != logN) throw new Error('Input size must be a power of 2.');\n\n  if (complexSignal.real.length != complexSignal.imag.length) {\n    throw new Error('Real and imaginary components must have the same length.');\n  }\n\n  var bitReversedIndices = utils.bitReverseArray(N);\n\n  // sort array\n  var ordered = {\n    'real': [],\n    'imag': []\n  };\n\n  for (var i = 0; i < N; i++) {\n    ordered.real[bitReversedIndices[i]] = complexSignal.real[i];\n    ordered.imag[bitReversedIndices[i]] = complexSignal.imag[i];\n  }\n\n  for (var _i = 0; _i < N; _i++) {\n    complexSignal.real[_i] = ordered.real[_i];\n    complexSignal.imag[_i] = ordered.imag[_i];\n  }\n  // iterate over the number of stages\n  for (var n = 1; n <= logN; n++) {\n    var currN = Math.pow(2, n);\n\n    // find twiddle factors\n    for (var k = 0; k < currN / 2; k++) {\n      var twiddle = utils.euler(k, currN);\n\n      // on each block of FT, implement the butterfly diagram\n      for (var m = 0; m < N / currN; m++) {\n        var currEvenIndex = currN * m + k;\n        var currOddIndex = currN * m + k + currN / 2;\n\n        var currEvenIndexSample = {\n          'real': complexSignal.real[currEvenIndex],\n          'imag': complexSignal.imag[currEvenIndex]\n        };\n        var currOddIndexSample = {\n          'real': complexSignal.real[currOddIndex],\n          'imag': complexSignal.imag[currOddIndex]\n        };\n\n        var odd = utils.multiply(twiddle, currOddIndexSample);\n\n        var subtractionResult = utils.subtract(currEvenIndexSample, odd);\n        complexSignal.real[currOddIndex] = subtractionResult.real;\n        complexSignal.imag[currOddIndex] = subtractionResult.imag;\n\n        var additionResult = utils.add(odd, currEvenIndexSample);\n        complexSignal.real[currEvenIndex] = additionResult.real;\n        complexSignal.imag[currEvenIndex] = additionResult.imag;\n      }\n    }\n  }\n\n  return complexSignal;\n};\n\n// complex to real ifft\nvar ifft = function ifft(signal) {\n\n  if (signal.real === undefined || signal.imag === undefined) {\n    throw new Error(\"IFFT only accepts a complex input.\");\n  }\n\n  var N = signal.real.length;\n\n  var complexSignal = {\n    'real': [],\n    'imag': []\n  };\n\n  //take complex conjugate in order to be able to use the regular FFT for IFFT\n  for (var i = 0; i < N; i++) {\n    var currentSample = {\n      'real': signal.real[i],\n      'imag': signal.imag[i]\n    };\n\n    var conjugateSample = utils.conj(currentSample);\n    complexSignal.real[i] = conjugateSample.real;\n    complexSignal.imag[i] = conjugateSample.imag;\n  }\n\n  //compute\n  var X = fft(complexSignal);\n\n  //normalize\n  complexSignal.real = X.real.map(function (val) {\n    return val / N;\n  });\n\n  complexSignal.imag = X.imag.map(function (val) {\n    return val / N;\n  });\n\n  return complexSignal;\n};\n\nmodule.exports = {\n  fft: fft,\n  ifft: ifft\n};","'use strict';\n\n// memoization of the reversal of different lengths.\n\nfunction _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }\n\nvar memoizedReversal = {};\nvar memoizedZeroBuffers = {};\n\nvar constructComplexArray = function constructComplexArray(signal) {\n  var complexSignal = {};\n\n  complexSignal.real = signal.real === undefined ? signal.slice() : signal.real.slice();\n\n  var bufferSize = complexSignal.real.length;\n\n  if (memoizedZeroBuffers[bufferSize] === undefined) {\n    memoizedZeroBuffers[bufferSize] = Array.apply(null, Array(bufferSize)).map(Number.prototype.valueOf, 0);\n  }\n\n  complexSignal.imag = memoizedZeroBuffers[bufferSize].slice();\n\n  return complexSignal;\n};\n\nvar bitReverseArray = function bitReverseArray(N) {\n  if (memoizedReversal[N] === undefined) {\n    var maxBinaryLength = (N - 1).toString(2).length; //get the binary length of the largest index.\n    var templateBinary = '0'.repeat(maxBinaryLength); //create a template binary of that length.\n    var reversed = {};\n    for (var n = 0; n < N; n++) {\n      var currBinary = n.toString(2); //get binary value of current index.\n\n      //prepend zeros from template to current binary. This makes binary values of all indices have the same length.\n      currBinary = templateBinary.substr(currBinary.length) + currBinary;\n\n      currBinary = [].concat(_toConsumableArray(currBinary)).reverse().join(''); //reverse\n      reversed[n] = parseInt(currBinary, 2); //convert to decimal\n    }\n    memoizedReversal[N] = reversed; //save\n  }\n  return memoizedReversal[N];\n};\n\n// complex multiplication\nvar multiply = function multiply(a, b) {\n  return {\n    'real': a.real * b.real - a.imag * b.imag,\n    'imag': a.real * b.imag + a.imag * b.real\n  };\n};\n\n// complex addition\nvar add = function add(a, b) {\n  return {\n    'real': a.real + b.real,\n    'imag': a.imag + b.imag\n  };\n};\n\n// complex subtraction\nvar subtract = function subtract(a, b) {\n  return {\n    'real': a.real - b.real,\n    'imag': a.imag - b.imag\n  };\n};\n\n// euler's identity e^x = cos(x) + sin(x)\nvar euler = function euler(kn, N) {\n  var x = -2 * Math.PI * kn / N;\n  return { 'real': Math.cos(x), 'imag': Math.sin(x) };\n};\n\n// complex conjugate\nvar conj = function conj(a) {\n  a.imag *= -1;\n  return a;\n};\n\nmodule.exports = {\n  bitReverseArray: bitReverseArray,\n  multiply: multiply,\n  add: add,\n  subtract: subtract,\n  euler: euler,\n  conj: conj,\n  constructComplexArray: constructComplexArray\n};","if (typeof Object.create === 'function') {\n  // implementation from standard node.js 'util' module\n  module.exports = function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor\n    ctor.prototype = Object.create(superCtor.prototype, {\n      constructor: {\n        value: ctor,\n        enumerable: false,\n        writable: true,\n        configurable: true\n      }\n    });\n  };\n} else {\n  // old school shim for old browsers\n  module.exports = function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor\n    var TempCtor = function () {}\n    TempCtor.prototype = superCtor.prototype\n    ctor.prototype = new TempCtor()\n    ctor.prototype.constructor = ctor\n  }\n}\n","module.exports = function isBuffer(arg) {\n  return arg && typeof arg === 'object'\n    && typeof arg.copy === 'function'\n    && typeof arg.fill === 'function'\n    && typeof arg.readUInt8 === 'function';\n}","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nvar getOwnPropertyDescriptors = Object.getOwnPropertyDescriptors ||\n  function getOwnPropertyDescriptors(obj) {\n    var keys = Object.keys(obj);\n    var descriptors = {};\n    for (var i = 0; i < keys.length; i++) {\n      descriptors[keys[i]] = Object.getOwnPropertyDescriptor(obj, keys[i]);\n    }\n    return descriptors;\n  };\n\nvar formatRegExp = /%[sdj%]/g;\nexports.format = function(f) {\n  if (!isString(f)) {\n    var objects = [];\n    for (var i = 0; i < arguments.length; i++) {\n      objects.push(inspect(arguments[i]));\n    }\n    return objects.join(' ');\n  }\n\n  var i = 1;\n  var args = arguments;\n  var len = args.length;\n  var str = String(f).replace(formatRegExp, function(x) {\n    if (x === '%%') return '%';\n    if (i >= len) return x;\n    switch (x) {\n      case '%s': return String(args[i++]);\n      case '%d': return Number(args[i++]);\n      case '%j':\n        try {\n          return JSON.stringify(args[i++]);\n        } catch (_) {\n          return '[Circular]';\n        }\n      default:\n        return x;\n    }\n  });\n  for (var x = args[i]; i < len; x = args[++i]) {\n    if (isNull(x) || !isObject(x)) {\n      str += ' ' + x;\n    } else {\n      str += ' ' + inspect(x);\n    }\n  }\n  return str;\n};\n\n\n// Mark that a method should not be used.\n// Returns a modified function which warns once by default.\n// If --no-deprecation is set, then it is a no-op.\nexports.deprecate = function(fn, msg) {\n  if (typeof process !== 'undefined' && process.noDeprecation === true) {\n    return fn;\n  }\n\n  // Allow for deprecating things in the process of starting up.\n  if (typeof process === 'undefined') {\n    return function() {\n      return exports.deprecate(fn, msg).apply(this, arguments);\n    };\n  }\n\n  var warned = false;\n  function deprecated() {\n    if (!warned) {\n      if (process.throwDeprecation) {\n        throw new Error(msg);\n      } else if (process.traceDeprecation) {\n        console.trace(msg);\n      } else {\n        console.error(msg);\n      }\n      warned = true;\n    }\n    return fn.apply(this, arguments);\n  }\n\n  return deprecated;\n};\n\n\nvar debugs = {};\nvar debugEnviron;\nexports.debuglog = function(set) {\n  if (isUndefined(debugEnviron))\n    debugEnviron = process.env.NODE_DEBUG || '';\n  set = set.toUpperCase();\n  if (!debugs[set]) {\n    if (new RegExp('\\\\b' + set + '\\\\b', 'i').test(debugEnviron)) {\n      var pid = process.pid;\n      debugs[set] = function() {\n        var msg = exports.format.apply(exports, arguments);\n        console.error('%s %d: %s', set, pid, msg);\n      };\n    } else {\n      debugs[set] = function() {};\n    }\n  }\n  return debugs[set];\n};\n\n\n/**\n * Echos the value of a value. Trys to print the value out\n * in the best way possible given the different types.\n *\n * @param {Object} obj The object to print out.\n * @param {Object} opts Optional options object that alters the output.\n */\n/* legacy: obj, showHidden, depth, colors*/\nfunction inspect(obj, opts) {\n  // default options\n  var ctx = {\n    seen: [],\n    stylize: stylizeNoColor\n  };\n  // legacy...\n  if (arguments.length >= 3) ctx.depth = arguments[2];\n  if (arguments.length >= 4) ctx.colors = arguments[3];\n  if (isBoolean(opts)) {\n    // legacy...\n    ctx.showHidden = opts;\n  } else if (opts) {\n    // got an \"options\" object\n    exports._extend(ctx, opts);\n  }\n  // set default options\n  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;\n  if (isUndefined(ctx.depth)) ctx.depth = 2;\n  if (isUndefined(ctx.colors)) ctx.colors = false;\n  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;\n  if (ctx.colors) ctx.stylize = stylizeWithColor;\n  return formatValue(ctx, obj, ctx.depth);\n}\nexports.inspect = inspect;\n\n\n// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics\ninspect.colors = {\n  'bold' : [1, 22],\n  'italic' : [3, 23],\n  'underline' : [4, 24],\n  'inverse' : [7, 27],\n  'white' : [37, 39],\n  'grey' : [90, 39],\n  'black' : [30, 39],\n  'blue' : [34, 39],\n  'cyan' : [36, 39],\n  'green' : [32, 39],\n  'magenta' : [35, 39],\n  'red' : [31, 39],\n  'yellow' : [33, 39]\n};\n\n// Don't use 'blue' not visible on cmd.exe\ninspect.styles = {\n  'special': 'cyan',\n  'number': 'yellow',\n  'boolean': 'yellow',\n  'undefined': 'grey',\n  'null': 'bold',\n  'string': 'green',\n  'date': 'magenta',\n  // \"name\": intentionally not styling\n  'regexp': 'red'\n};\n\n\nfunction stylizeWithColor(str, styleType) {\n  var style = inspect.styles[styleType];\n\n  if (style) {\n    return '\\u001b[' + inspect.colors[style][0] + 'm' + str +\n           '\\u001b[' + inspect.colors[style][1] + 'm';\n  } else {\n    return str;\n  }\n}\n\n\nfunction stylizeNoColor(str, styleType) {\n  return str;\n}\n\n\nfunction arrayToHash(array) {\n  var hash = {};\n\n  array.forEach(function(val, idx) {\n    hash[val] = true;\n  });\n\n  return hash;\n}\n\n\nfunction formatValue(ctx, value, recurseTimes) {\n  // Provide a hook for user-specified inspect functions.\n  // Check that value is an object with an inspect function on it\n  if (ctx.customInspect &&\n      value &&\n      isFunction(value.inspect) &&\n      // Filter out the util module, it's inspect function is special\n      value.inspect !== exports.inspect &&\n      // Also filter out any prototype objects using the circular check.\n      !(value.constructor && value.constructor.prototype === value)) {\n    var ret = value.inspect(recurseTimes, ctx);\n    if (!isString(ret)) {\n      ret = formatValue(ctx, ret, recurseTimes);\n    }\n    return ret;\n  }\n\n  // Primitive types cannot have properties\n  var primitive = formatPrimitive(ctx, value);\n  if (primitive) {\n    return primitive;\n  }\n\n  // Look up the keys of the object.\n  var keys = Object.keys(value);\n  var visibleKeys = arrayToHash(keys);\n\n  if (ctx.showHidden) {\n    keys = Object.getOwnPropertyNames(value);\n  }\n\n  // IE doesn't make error fields non-enumerable\n  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx\n  if (isError(value)\n      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {\n    return formatError(value);\n  }\n\n  // Some type of object without properties can be shortcutted.\n  if (keys.length === 0) {\n    if (isFunction(value)) {\n      var name = value.name ? ': ' + value.name : '';\n      return ctx.stylize('[Function' + name + ']', 'special');\n    }\n    if (isRegExp(value)) {\n      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');\n    }\n    if (isDate(value)) {\n      return ctx.stylize(Date.prototype.toString.call(value), 'date');\n    }\n    if (isError(value)) {\n      return formatError(value);\n    }\n  }\n\n  var base = '', array = false, braces = ['{', '}'];\n\n  // Make Array say that they are Array\n  if (isArray(value)) {\n    array = true;\n    braces = ['[', ']'];\n  }\n\n  // Make functions say that they are functions\n  if (isFunction(value)) {\n    var n = value.name ? ': ' + value.name : '';\n    base = ' [Function' + n + ']';\n  }\n\n  // Make RegExps say that they are RegExps\n  if (isRegExp(value)) {\n    base = ' ' + RegExp.prototype.toString.call(value);\n  }\n\n  // Make dates with properties first say the date\n  if (isDate(value)) {\n    base = ' ' + Date.prototype.toUTCString.call(value);\n  }\n\n  // Make error with message first say the error\n  if (isError(value)) {\n    base = ' ' + formatError(value);\n  }\n\n  if (keys.length === 0 && (!array || value.length == 0)) {\n    return braces[0] + base + braces[1];\n  }\n\n  if (recurseTimes < 0) {\n    if (isRegExp(value)) {\n      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');\n    } else {\n      return ctx.stylize('[Object]', 'special');\n    }\n  }\n\n  ctx.seen.push(value);\n\n  var output;\n  if (array) {\n    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);\n  } else {\n    output = keys.map(function(key) {\n      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);\n    });\n  }\n\n  ctx.seen.pop();\n\n  return reduceToSingleString(output, base, braces);\n}\n\n\nfunction formatPrimitive(ctx, value) {\n  if (isUndefined(value))\n    return ctx.stylize('undefined', 'undefined');\n  if (isString(value)) {\n    var simple = '\\'' + JSON.stringify(value).replace(/^\"|\"$/g, '')\n                                             .replace(/'/g, \"\\\\'\")\n                                             .replace(/\\\\\"/g, '\"') + '\\'';\n    return ctx.stylize(simple, 'string');\n  }\n  if (isNumber(value))\n    return ctx.stylize('' + value, 'number');\n  if (isBoolean(value))\n    return ctx.stylize('' + value, 'boolean');\n  // For some reason typeof null is \"object\", so special case here.\n  if (isNull(value))\n    return ctx.stylize('null', 'null');\n}\n\n\nfunction formatError(value) {\n  return '[' + Error.prototype.toString.call(value) + ']';\n}\n\n\nfunction formatArray(ctx, value, recurseTimes, visibleKeys, keys) {\n  var output = [];\n  for (var i = 0, l = value.length; i < l; ++i) {\n    if (hasOwnProperty(value, String(i))) {\n      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,\n          String(i), true));\n    } else {\n      output.push('');\n    }\n  }\n  keys.forEach(function(key) {\n    if (!key.match(/^\\d+$/)) {\n      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,\n          key, true));\n    }\n  });\n  return output;\n}\n\n\nfunction formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {\n  var name, str, desc;\n  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };\n  if (desc.get) {\n    if (desc.set) {\n      str = ctx.stylize('[Getter/Setter]', 'special');\n    } else {\n      str = ctx.stylize('[Getter]', 'special');\n    }\n  } else {\n    if (desc.set) {\n      str = ctx.stylize('[Setter]', 'special');\n    }\n  }\n  if (!hasOwnProperty(visibleKeys, key)) {\n    name = '[' + key + ']';\n  }\n  if (!str) {\n    if (ctx.seen.indexOf(desc.value) < 0) {\n      if (isNull(recurseTimes)) {\n        str = formatValue(ctx, desc.value, null);\n      } else {\n        str = formatValue(ctx, desc.value, recurseTimes - 1);\n      }\n      if (str.indexOf('\\n') > -1) {\n        if (array) {\n          str = str.split('\\n').map(function(line) {\n            return '  ' + line;\n          }).join('\\n').substr(2);\n        } else {\n          str = '\\n' + str.split('\\n').map(function(line) {\n            return '   ' + line;\n          }).join('\\n');\n        }\n      }\n    } else {\n      str = ctx.stylize('[Circular]', 'special');\n    }\n  }\n  if (isUndefined(name)) {\n    if (array && key.match(/^\\d+$/)) {\n      return str;\n    }\n    name = JSON.stringify('' + key);\n    if (name.match(/^\"([a-zA-Z_][a-zA-Z_0-9]*)\"$/)) {\n      name = name.substr(1, name.length - 2);\n      name = ctx.stylize(name, 'name');\n    } else {\n      name = name.replace(/'/g, \"\\\\'\")\n                 .replace(/\\\\\"/g, '\"')\n                 .replace(/(^\"|\"$)/g, \"'\");\n      name = ctx.stylize(name, 'string');\n    }\n  }\n\n  return name + ': ' + str;\n}\n\n\nfunction reduceToSingleString(output, base, braces) {\n  var numLinesEst = 0;\n  var length = output.reduce(function(prev, cur) {\n    numLinesEst++;\n    if (cur.indexOf('\\n') >= 0) numLinesEst++;\n    return prev + cur.replace(/\\u001b\\[\\d\\d?m/g, '').length + 1;\n  }, 0);\n\n  if (length > 60) {\n    return braces[0] +\n           (base === '' ? '' : base + '\\n ') +\n           ' ' +\n           output.join(',\\n  ') +\n           ' ' +\n           braces[1];\n  }\n\n  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];\n}\n\n\n// NOTE: These type checking functions intentionally don't use `instanceof`\n// because it is fragile and can be easily faked with `Object.create()`.\nfunction isArray(ar) {\n  return Array.isArray(ar);\n}\nexports.isArray = isArray;\n\nfunction isBoolean(arg) {\n  return typeof arg === 'boolean';\n}\nexports.isBoolean = isBoolean;\n\nfunction isNull(arg) {\n  return arg === null;\n}\nexports.isNull = isNull;\n\nfunction isNullOrUndefined(arg) {\n  return arg == null;\n}\nexports.isNullOrUndefined = isNullOrUndefined;\n\nfunction isNumber(arg) {\n  return typeof arg === 'number';\n}\nexports.isNumber = isNumber;\n\nfunction isString(arg) {\n  return typeof arg === 'string';\n}\nexports.isString = isString;\n\nfunction isSymbol(arg) {\n  return typeof arg === 'symbol';\n}\nexports.isSymbol = isSymbol;\n\nfunction isUndefined(arg) {\n  return arg === void 0;\n}\nexports.isUndefined = isUndefined;\n\nfunction isRegExp(re) {\n  return isObject(re) && objectToString(re) === '[object RegExp]';\n}\nexports.isRegExp = isRegExp;\n\nfunction isObject(arg) {\n  return typeof arg === 'object' && arg !== null;\n}\nexports.isObject = isObject;\n\nfunction isDate(d) {\n  return isObject(d) && objectToString(d) === '[object Date]';\n}\nexports.isDate = isDate;\n\nfunction isError(e) {\n  return isObject(e) &&\n      (objectToString(e) === '[object Error]' || e instanceof Error);\n}\nexports.isError = isError;\n\nfunction isFunction(arg) {\n  return typeof arg === 'function';\n}\nexports.isFunction = isFunction;\n\nfunction isPrimitive(arg) {\n  return arg === null ||\n         typeof arg === 'boolean' ||\n         typeof arg === 'number' ||\n         typeof arg === 'string' ||\n         typeof arg === 'symbol' ||  // ES6 symbol\n         typeof arg === 'undefined';\n}\nexports.isPrimitive = isPrimitive;\n\nexports.isBuffer = require('./support/isBuffer');\n\nfunction objectToString(o) {\n  return Object.prototype.toString.call(o);\n}\n\n\nfunction pad(n) {\n  return n < 10 ? '0' + n.toString(10) : n.toString(10);\n}\n\n\nvar months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',\n              'Oct', 'Nov', 'Dec'];\n\n// 26 Feb 16:19:34\nfunction timestamp() {\n  var d = new Date();\n  var time = [pad(d.getHours()),\n              pad(d.getMinutes()),\n              pad(d.getSeconds())].join(':');\n  return [d.getDate(), months[d.getMonth()], time].join(' ');\n}\n\n\n// log is just a thin wrapper to console.log that prepends a timestamp\nexports.log = function() {\n  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));\n};\n\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * The Function.prototype.inherits from lang.js rewritten as a standalone\n * function (not on Function.prototype). NOTE: If this file is to be loaded\n * during bootstrapping this function needs to be rewritten using some native\n * functions as prototype setup using normal JavaScript does not work as\n * expected during bootstrapping (see mirror.js in r114903).\n *\n * @param {function} ctor Constructor function which needs to inherit the\n *     prototype.\n * @param {function} superCtor Constructor function to inherit prototype from.\n */\nexports.inherits = require('inherits');\n\nexports._extend = function(origin, add) {\n  // Don't do anything if add isn't an object\n  if (!add || !isObject(add)) return origin;\n\n  var keys = Object.keys(add);\n  var i = keys.length;\n  while (i--) {\n    origin[keys[i]] = add[keys[i]];\n  }\n  return origin;\n};\n\nfunction hasOwnProperty(obj, prop) {\n  return Object.prototype.hasOwnProperty.call(obj, prop);\n}\n\nvar kCustomPromisifiedSymbol = typeof Symbol !== 'undefined' ? Symbol('util.promisify.custom') : undefined;\n\nexports.promisify = function promisify(original) {\n  if (typeof original !== 'function')\n    throw new TypeError('The \"original\" argument must be of type Function');\n\n  if (kCustomPromisifiedSymbol && original[kCustomPromisifiedSymbol]) {\n    var fn = original[kCustomPromisifiedSymbol];\n    if (typeof fn !== 'function') {\n      throw new TypeError('The \"util.promisify.custom\" argument must be of type Function');\n    }\n    Object.defineProperty(fn, kCustomPromisifiedSymbol, {\n      value: fn, enumerable: false, writable: false, configurable: true\n    });\n    return fn;\n  }\n\n  function fn() {\n    var promiseResolve, promiseReject;\n    var promise = new Promise(function (resolve, reject) {\n      promiseResolve = resolve;\n      promiseReject = reject;\n    });\n\n    var args = [];\n    for (var i = 0; i < arguments.length; i++) {\n      args.push(arguments[i]);\n    }\n    args.push(function (err, value) {\n      if (err) {\n        promiseReject(err);\n      } else {\n        promiseResolve(value);\n      }\n    });\n\n    try {\n      original.apply(this, args);\n    } catch (err) {\n      promiseReject(err);\n    }\n\n    return promise;\n  }\n\n  Object.setPrototypeOf(fn, Object.getPrototypeOf(original));\n\n  if (kCustomPromisifiedSymbol) Object.defineProperty(fn, kCustomPromisifiedSymbol, {\n    value: fn, enumerable: false, writable: false, configurable: true\n  });\n  return Object.defineProperties(\n    fn,\n    getOwnPropertyDescriptors(original)\n  );\n}\n\nexports.promisify.custom = kCustomPromisifiedSymbol\n\nfunction callbackifyOnRejected(reason, cb) {\n  // `!reason` guard inspired by bluebird (Ref: https://goo.gl/t5IS6M).\n  // Because `null` is a special error value in callbacks which means \"no error\n  // occurred\", we error-wrap so the callback consumer can distinguish between\n  // \"the promise rejected with null\" or \"the promise fulfilled with undefined\".\n  if (!reason) {\n    var newReason = new Error('Promise was rejected with a falsy value');\n    newReason.reason = reason;\n    reason = newReason;\n  }\n  return cb(reason);\n}\n\nfunction callbackify(original) {\n  if (typeof original !== 'function') {\n    throw new TypeError('The \"original\" argument must be of type Function');\n  }\n\n  // We DO NOT return the promise as it gives the user a false sense that\n  // the promise is actually somehow related to the callback's execution\n  // and that the callback throwing will reject the promise.\n  function callbackified() {\n    var args = [];\n    for (var i = 0; i < arguments.length; i++) {\n      args.push(arguments[i]);\n    }\n\n    var maybeCb = args.pop();\n    if (typeof maybeCb !== 'function') {\n      throw new TypeError('The last argument must be of type Function');\n    }\n    var self = this;\n    var cb = function() {\n      return maybeCb.apply(self, arguments);\n    };\n    // In true node style we process the callback on `nextTick` with all the\n    // implications (stack, `uncaughtException`, `async_hooks`)\n    original.apply(this, args)\n      .then(function(ret) { process.nextTick(cb, null, ret) },\n            function(rej) { process.nextTick(callbackifyOnRejected, rej, cb) });\n  }\n\n  Object.setPrototypeOf(callbackified, Object.getPrototypeOf(original));\n  Object.defineProperties(callbackified,\n                          getOwnPropertyDescriptors(original));\n  return callbackified;\n}\nexports.callbackify = callbackify;\n","/*\nobject-assign\n(c) Sindre Sorhus\n@license MIT\n*/\n\n'use strict';\n/* eslint-disable no-unused-vars */\nvar getOwnPropertySymbols = Object.getOwnPropertySymbols;\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\nvar propIsEnumerable = Object.prototype.propertyIsEnumerable;\n\nfunction toObject(val) {\n\tif (val === null || val === undefined) {\n\t\tthrow new TypeError('Object.assign cannot be called with null or undefined');\n\t}\n\n\treturn Object(val);\n}\n\nfunction shouldUseNative() {\n\ttry {\n\t\tif (!Object.assign) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Detect buggy property enumeration order in older V8 versions.\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=4118\n\t\tvar test1 = new String('abc');  // eslint-disable-line no-new-wrappers\n\t\ttest1[5] = 'de';\n\t\tif (Object.getOwnPropertyNames(test1)[0] === '5') {\n\t\t\treturn false;\n\t\t}\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=3056\n\t\tvar test2 = {};\n\t\tfor (var i = 0; i < 10; i++) {\n\t\t\ttest2['_' + String.fromCharCode(i)] = i;\n\t\t}\n\t\tvar order2 = Object.getOwnPropertyNames(test2).map(function (n) {\n\t\t\treturn test2[n];\n\t\t});\n\t\tif (order2.join('') !== '0123456789') {\n\t\t\treturn false;\n\t\t}\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=3056\n\t\tvar test3 = {};\n\t\t'abcdefghijklmnopqrst'.split('').forEach(function (letter) {\n\t\t\ttest3[letter] = letter;\n\t\t});\n\t\tif (Object.keys(Object.assign({}, test3)).join('') !==\n\t\t\t\t'abcdefghijklmnopqrst') {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t} catch (err) {\n\t\t// We don't expect any of the above to throw, but better to be safe.\n\t\treturn false;\n\t}\n}\n\nmodule.exports = shouldUseNative() ? Object.assign : function (target, source) {\n\tvar from;\n\tvar to = toObject(target);\n\tvar symbols;\n\n\tfor (var s = 1; s < arguments.length; s++) {\n\t\tfrom = Object(arguments[s]);\n\n\t\tfor (var key in from) {\n\t\t\tif (hasOwnProperty.call(from, key)) {\n\t\t\t\tto[key] = from[key];\n\t\t\t}\n\t\t}\n\n\t\tif (getOwnPropertySymbols) {\n\t\t\tsymbols = getOwnPropertySymbols(from);\n\t\t\tfor (var i = 0; i < symbols.length; i++) {\n\t\t\t\tif (propIsEnumerable.call(from, symbols[i])) {\n\t\t\t\t\tto[symbols[i]] = from[symbols[i]];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\treturn to;\n};\n","// shim for using process in browser\nvar process = module.exports = {};\n\n// cached from whatever global is present so that test runners that stub it\n// don't break things.  But we need to wrap it in a try catch in case it is\n// wrapped in strict mode code which doesn't define any globals.  It's inside a\n// function because try/catches deoptimize in certain engines.\n\nvar cachedSetTimeout;\nvar cachedClearTimeout;\n\nfunction defaultSetTimout() {\n    throw new Error('setTimeout has not been defined');\n}\nfunction defaultClearTimeout () {\n    throw new Error('clearTimeout has not been defined');\n}\n(function () {\n    try {\n        if (typeof setTimeout === 'function') {\n            cachedSetTimeout = setTimeout;\n        } else {\n            cachedSetTimeout = defaultSetTimout;\n        }\n    } catch (e) {\n        cachedSetTimeout = defaultSetTimout;\n    }\n    try {\n        if (typeof clearTimeout === 'function') {\n            cachedClearTimeout = clearTimeout;\n        } else {\n            cachedClearTimeout = defaultClearTimeout;\n        }\n    } catch (e) {\n        cachedClearTimeout = defaultClearTimeout;\n    }\n} ())\nfunction runTimeout(fun) {\n    if (cachedSetTimeout === setTimeout) {\n        //normal enviroments in sane situations\n        return setTimeout(fun, 0);\n    }\n    // if setTimeout wasn't available but was latter defined\n    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {\n        cachedSetTimeout = setTimeout;\n        return setTimeout(fun, 0);\n    }\n    try {\n        // when when somebody has screwed with setTimeout but no I.E. maddness\n        return cachedSetTimeout(fun, 0);\n    } catch(e){\n        try {\n            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally\n            return cachedSetTimeout.call(null, fun, 0);\n        } catch(e){\n            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error\n            return cachedSetTimeout.call(this, fun, 0);\n        }\n    }\n\n\n}\nfunction runClearTimeout(marker) {\n    if (cachedClearTimeout === clearTimeout) {\n        //normal enviroments in sane situations\n        return clearTimeout(marker);\n    }\n    // if clearTimeout wasn't available but was latter defined\n    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {\n        cachedClearTimeout = clearTimeout;\n        return clearTimeout(marker);\n    }\n    try {\n        // when when somebody has screwed with setTimeout but no I.E. maddness\n        return cachedClearTimeout(marker);\n    } catch (e){\n        try {\n            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally\n            return cachedClearTimeout.call(null, marker);\n        } catch (e){\n            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.\n            // Some versions of I.E. have different rules for clearTimeout vs setTimeout\n            return cachedClearTimeout.call(this, marker);\n        }\n    }\n\n\n\n}\nvar queue = [];\nvar draining = false;\nvar currentQueue;\nvar queueIndex = -1;\n\nfunction cleanUpNextTick() {\n    if (!draining || !currentQueue) {\n        return;\n    }\n    draining = false;\n    if (currentQueue.length) {\n        queue = currentQueue.concat(queue);\n    } else {\n        queueIndex = -1;\n    }\n    if (queue.length) {\n        drainQueue();\n    }\n}\n\nfunction drainQueue() {\n    if (draining) {\n        return;\n    }\n    var timeout = runTimeout(cleanUpNextTick);\n    draining = true;\n\n    var len = queue.length;\n    while(len) {\n        currentQueue = queue;\n        queue = [];\n        while (++queueIndex < len) {\n            if (currentQueue) {\n                currentQueue[queueIndex].run();\n            }\n        }\n        queueIndex = -1;\n        len = queue.length;\n    }\n    currentQueue = null;\n    draining = false;\n    runClearTimeout(timeout);\n}\n\nprocess.nextTick = function (fun) {\n    var args = new Array(arguments.length - 1);\n    if (arguments.length > 1) {\n        for (var i = 1; i < arguments.length; i++) {\n            args[i - 1] = arguments[i];\n        }\n    }\n    queue.push(new Item(fun, args));\n    if (queue.length === 1 && !draining) {\n        runTimeout(drainQueue);\n    }\n};\n\n// v8 likes predictible objects\nfunction Item(fun, array) {\n    this.fun = fun;\n    this.array = array;\n}\nItem.prototype.run = function () {\n    this.fun.apply(null, this.array);\n};\nprocess.title = 'browser';\nprocess.browser = true;\nprocess.env = {};\nprocess.argv = [];\nprocess.version = ''; // empty string to avoid regexp issues\nprocess.versions = {};\n\nfunction noop() {}\n\nprocess.on = noop;\nprocess.addListener = noop;\nprocess.once = noop;\nprocess.off = noop;\nprocess.removeListener = noop;\nprocess.removeAllListeners = noop;\nprocess.emit = noop;\nprocess.prependListener = noop;\nprocess.prependOnceListener = noop;\n\nprocess.listeners = function (name) { return [] }\n\nprocess.binding = function (name) {\n    throw new Error('process.binding is not supported');\n};\n\nprocess.cwd = function () { return '/' };\nprocess.chdir = function (dir) {\n    throw new Error('process.chdir is not supported');\n};\nprocess.umask = function() { return 0; };\n","var g;\n\n// This works in non-strict mode\ng = (function() {\n\treturn this;\n})();\n\ntry {\n\t// This works if eval is allowed (see CSP)\n\tg = g || new Function(\"return this\")();\n} catch (e) {\n\t// This works if the window reference is available\n\tif (typeof window === \"object\") g = window;\n}\n\n// g can still be undefined, but nothing to do about it...\n// We return undefined, instead of nothing here, so it's\n// easier to handle this case. if(!global) { ...}\n\nmodule.exports = g;\n","export default function(args) {\n  if (typeof args.ampSpectrum !== 'object') {\n    throw new TypeError('Valid ampSpectrum is required to generate chroma');\n  }\n  if (typeof args.chromaFilterBank !== 'object') {\n    throw new TypeError('Valid chromaFilterBank is required to generate chroma');\n  }\n\n  var chromagram = args.chromaFilterBank.map((row, i) =>\n    args.ampSpectrum.reduce((acc, v, j) => acc + v * row[j], 0)\n  );\n  var maxVal = Math.max(...chromagram);\n\n\n  return maxVal\n    ? chromagram.map(v => v / maxVal)\n    : chromagram;\n}\n","import * as assert from 'assert';\n\nexport default function() {\n  if (typeof arguments[0].signal !== 'object') {\n    throw new TypeError();\n  }\n\n  var energy = 0;\n  for (var i = 0; i < arguments[0].signal.length; i++) {\n    energy += Math.pow(Math.abs(arguments[0].signal[i]), 2);\n  }\n\n  return energy;\n}\n","export function mu(i, amplitudeSpect) {\n  var numerator = 0;\n  var denominator = 0;\n  for (var k = 0; k < amplitudeSpect.length; k++) {\n    numerator += Math.pow(k, i) * Math.abs(amplitudeSpect[k]);\n    denominator += amplitudeSpect[k];\n  }\n\n  return numerator / denominator;\n}\n","export default function(args) {\n  if (typeof args.ampSpectrum !== 'object' ||\n         typeof args.barkScale !== 'object') {\n    throw new TypeError();\n  }\n\n  var NUM_BARK_BANDS = 24;\n  var specific = new Float32Array(NUM_BARK_BANDS);\n  var total = 0;\n  var normalisedSpectrum = args.ampSpectrum;\n  var bbLimits = new Int32Array(NUM_BARK_BANDS + 1);\n\n  bbLimits[0] = 0;\n  var currentBandEnd = args.barkScale[normalisedSpectrum.length - 1] /\n        NUM_BARK_BANDS;\n  var currentBand = 1;\n  for (let i = 0; i < normalisedSpectrum.length; i++) {\n    while (args.barkScale[i] > currentBandEnd) {\n      bbLimits[currentBand++] = i;\n      currentBandEnd = currentBand *\n\t\t\t\t\t\t\t\targs.barkScale[normalisedSpectrum.length - 1] /\n                NUM_BARK_BANDS;\n    }\n  }\n\n  bbLimits[NUM_BARK_BANDS] = normalisedSpectrum.length - 1;\n\n  //process\n\n  for (let i = 0; i < NUM_BARK_BANDS; i++) {\n    let sum = 0;\n    for (let j = bbLimits[i]; j < bbLimits[i + 1]; j++) {\n\n      sum += normalisedSpectrum[j];\n    }\n\n    specific[i] = Math.pow(sum, 0.23);\n  }\n\n  //get total loudness\n  for (let i = 0; i < specific.length; i++) {\n    total += specific[i];\n  }\n\n  return {\n    specific: specific,\n    total: total,\n  };\n}\n","import powerSpectrum from './powerSpectrum';\nimport freqToMel from './../utilities';\nimport melToFreq from './../utilities';\n\nvar dct = require('dct');\n\nexport default function(args) {\n  if (typeof args.ampSpectrum !== 'object') {\n    throw new TypeError('Valid ampSpectrum is required to generate MFCC');\n  }\n  if (typeof args.melFilterBank !== 'object') {\n    throw new TypeError('Valid melFilterBank is required to generate MFCC');\n  }\n\n  let numberOfMFCCCoefficients = Math.min(40, Math.max(1, args.numberOfMFCCCoefficients || 13));\n\n  // Tutorial from:\n  // http://practicalcryptography.com/miscellaneous/machine-learning\n  // /guide-mel-frequency-cepstral-coefficients-mfccs/\n  let powSpec = powerSpectrum(args);\n  let numFilters = args.melFilterBank.length;\n  let filtered = Array(numFilters);\n\n  if (numFilters < numberOfMFCCCoefficients) {\n    throw new Error(\"Insufficient filter bank for requested number of coefficients\");\n  }\n\n  let loggedMelBands = new Float32Array(numFilters);\n\n  for (let i = 0; i < loggedMelBands.length; i++) {\n    filtered[i] = new Float32Array(args.bufferSize / 2);\n    loggedMelBands[i] = 0;\n    for (let j = 0; j < (args.bufferSize / 2); j++) {\n      //point-wise multiplication between power spectrum and filterbanks.\n      filtered[i][j] = args.melFilterBank[i][j] * powSpec[j];\n\n      //summing up all of the coefficients into one array\n      loggedMelBands[i] += filtered[i][j];\n    }\n\n    //log each coefficient.\n    loggedMelBands[i] = Math.log(loggedMelBands[i] + 1);\n  }\n\n  //dct\n  let loggedMelBandsArray = Array.prototype.slice.call(loggedMelBands);\n  let mfccs = dct(loggedMelBandsArray).slice(0, numberOfMFCCCoefficients);\n\n  return mfccs;\n}\n","import loudness from './loudness';\n\nexport default function() {\n  if (typeof arguments[0].signal !== 'object') {\n    throw new TypeError();\n  }\n\n  var loudnessValue = loudness(arguments[0]);\n  var spec = loudnessValue.specific;\n  var output = 0;\n\n  for (var i = 0; i < spec.length; i++) {\n    if (i < 15) {\n      output += (i + 1) * spec[i + 1];\n    } else {\n      output += 0.066 * Math.exp(0.171 * (i + 1));\n    }\n  }\n\n  output *= 0.11 / loudnessValue.total;\n\n  return output;\n}\n","import loudness from './loudness';\n\nexport default function() {\n  if (typeof arguments[0].signal !== 'object') {\n    throw new TypeError();\n  }\n\n  var loudnessValue = loudness(arguments[0]);\n\n  var max = 0;\n  for (var i = 0; i < loudnessValue.specific.length; i++) {\n    if (loudnessValue.specific[i] > max) {\n      max = loudnessValue.specific[i];\n    }\n  }\n\n  var spread = Math.pow((loudnessValue.total - max) / loudnessValue.total, 2);\n\n  return spread;\n}\n","export default function() {\n  if (typeof arguments[0].ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  var powerSpectrum = new Float32Array(arguments[0].ampSpectrum.length);\n  for (var i = 0; i < powerSpectrum.length; i++) {\n    powerSpectrum[i] =  Math.pow(arguments[0].ampSpectrum[i], 2);\n  }\n\n  return powerSpectrum;\n}\n","export default function(args) {\n  if (typeof args.signal !== 'object') {\n    throw new TypeError();\n  }\n\n  var rms = 0;\n  for (var i = 0; i < args.signal.length; i++) {\n    rms += Math.pow(args.signal[i], 2);\n  }\n\n  rms = rms / args.signal.length;\n  rms = Math.sqrt(rms);\n\n  return rms;\n}\n","import {mu} from './extractorUtilities';\n\nexport default function() {\n  if (typeof arguments[0].ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  return mu(1, arguments[0].ampSpectrum);\n}\n","export default function() {\n  if (typeof arguments[0].ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  var numerator = 0;\n  var denominator = 0;\n  for (var i = 0; i < arguments[0].ampSpectrum.length; i++) {\n    numerator += Math.log(arguments[0].ampSpectrum[i]);\n    denominator += arguments[0].ampSpectrum[i];\n  }\n\n  return Math.exp(numerator / arguments[0].ampSpectrum.length) *\n      arguments[0].ampSpectrum.length / denominator;\n}\n","export default function(args) {\n  if (typeof args.signal !== 'object' ||\n  typeof args.previousSignal != 'object'\n\t\t) {\n    throw new TypeError();\n  }\n\n  let sf = 0;\n  for (let i = -(args.bufferSize / 2); i < signal.length / 2 - 1; i++) {\n    x = Math.abs(args.signal[i]) - Math.abs(args.previousSignal[i]);\n    sf += (x + Math.abs(x)) / 2;\n  }\n\n  return sf;\n}\n","import {mu} from './extractorUtilities';\n\nexport default function() {\n  if (typeof arguments[0].ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  var ampspec = arguments[0].ampSpectrum;\n  var mu1 = mu(1, ampspec);\n  var mu2 = mu(2, ampspec);\n  var mu3 = mu(3, ampspec);\n  var mu4 = mu(4, ampspec);\n  var numerator = -3 * Math.pow(mu1, 4) + 6 * mu1 * mu2 - 4 * mu1 * mu3 + mu4;\n  var denominator = Math.pow(Math.sqrt(mu2 - Math.pow(mu1, 2)), 4);\n  return numerator / denominator;\n}\n","export default function() {\n  if (typeof arguments[0].ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  var ampspec = arguments[0].ampSpectrum;\n\n  //calculate nyquist bin\n  var nyqBin = arguments[0].sampleRate / (2 * (ampspec.length - 1));\n  var ec = 0;\n  for (var i = 0; i < ampspec.length; i++) {\n    ec += ampspec[i];\n  }\n\n  var threshold = 0.99 * ec;\n  var n = ampspec.length - 1;\n  while (ec > threshold && n >= 0) {\n    ec -= ampspec[n];\n    --n;\n  }\n\n  return (n + 1) * nyqBin;\n}\n","import {mu} from './extractorUtilities';\n\nexport default function(args) {\n  if (typeof args.ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  var mu1 = mu(1, args.ampSpectrum);\n  var mu2 = mu(2, args.ampSpectrum);\n  var mu3 = mu(3, args.ampSpectrum);\n  var numerator = 2 * Math.pow(mu1, 3) - 3 * mu1 * mu2 + mu3;\n  var denominator = Math.pow(Math.sqrt(mu2 - Math.pow(mu1, 2)), 3);\n  return numerator / denominator;\n}\n","export default function(args) {\n  if (typeof args.ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  //linear regression\n  let ampSum = 0;\n  let freqSum = 0;\n  let freqs = new Float32Array(args.ampSpectrum.length);\n  let powFreqSum = 0;\n  let ampFreqSum = 0;\n\n  for (var i = 0; i < args.ampSpectrum.length; i++) {\n    ampSum += args.ampSpectrum[i];\n    let curFreq = i * args.sampleRate / args.bufferSize;\n    freqs[i] = curFreq;\n    powFreqSum += curFreq * curFreq;\n    freqSum += curFreq;\n    ampFreqSum += curFreq * args.ampSpectrum[i];\n  }\n\n  return (args.ampSpectrum.length * ampFreqSum - freqSum * ampSum) / (ampSum * (\n        powFreqSum - Math.pow(freqSum, 2)));\n}\n","import {mu} from './extractorUtilities';\n\nexport default function(args) {\n  if (typeof args.ampSpectrum !== 'object') {\n    throw new TypeError();\n  }\n\n  return Math.sqrt(mu(2, args.ampSpectrum) -\n         Math.pow(mu(1, args.ampSpectrum), 2));\n}\n","export default function() {\n  if (typeof arguments[0].signal !== 'object') {\n    throw new TypeError();\n  }\n\n  var zcr = 0;\n  for (var i = 1; i < arguments[0].signal.length; i++) {\n    if ((arguments[0].signal[i-1] >= 0 && arguments[0].signal[i] < 0) ||\n         (arguments[0].signal[i-1] < 0 && arguments[0].signal[i] >= 0)) {\n      zcr++;\n    }\n  }\n\n  return zcr;\n}\n","import rms from './extractors/rms';\nimport energy from './extractors/energy';\nimport spectralSlope from './extractors/spectralSlope';\nimport spectralCentroid from './extractors/spectralCentroid';\nimport spectralRolloff from './extractors/spectralRolloff';\nimport spectralFlatness from './extractors/spectralFlatness';\nimport spectralSpread from './extractors/spectralSpread';\nimport spectralSkewness from './extractors/spectralSkewness';\nimport spectralKurtosis from './extractors/spectralKurtosis';\nimport zcr from './extractors/zcr';\nimport loudness from './extractors/loudness';\nimport perceptualSpread from './extractors/perceptualSpread';\nimport perceptualSharpness from './extractors/perceptualSharpness';\nimport mfcc from './extractors/mfcc';\nimport chroma from './extractors/chroma';\nimport powerSpectrum from './extractors/powerSpectrum';\nimport spectralFlux from './extractors/spectralFlux';\n\nlet buffer = function(args) {\n  return args.signal;\n};\n\nlet complexSpectrum = function (args) {\n  return args.complexSpectrum;\n};\n\nlet amplitudeSpectrum = function (args) {\n  return args.ampSpectrum;\n};\n\nexport {\n  buffer,\n  rms,\n  energy,\n  complexSpectrum,\n\n  spectralSlope,\n  spectralCentroid,\n  spectralRolloff,\n  spectralFlatness,\n  spectralSpread,\n  spectralSkewness,\n  spectralKurtosis,\n  amplitudeSpectrum,\n\n  zcr,\n  loudness,\n  perceptualSpread,\n  perceptualSharpness,\n  powerSpectrum,\n  mfcc,\n  chroma,\n  spectralFlux\n};\n","module.exports = require('./main').default;","import * as utilities from './utilities';\nimport * as extractors from './featureExtractors';\nimport {fft, ifft} from 'fftjs';\nimport {MeydaAnalyzer} from './meyda-wa';\n\n/**\n * Meyda Module\n * @module meyda\n */\n\n/**\n * Options for constructing a MeydaAnalyzer\n * @typedef {Object} MeydaOptions\n * @property {AudioContext} audioContext - The Audio Context for the MeydaAnalyzer to operate in.\n * @property {AudioNode} source - The Audio Node for Meyda to listen to.\n * @property {number} [bufferSize] - The size of the buffer.\n * @property {number} [hopSize] - The hop size between buffers.\n * @property {number} [sampleRate] - The number of samples per second in the audio context.\n * @property {Function} [callback] - A function to receive the frames of audio features\n * @property {string} [windowingFunction] - The Windowing Function to apply to the signal before transformation to the frequency domain\n * @property {string|Array.<string>} [featureExtractors] - Specify the feature extractors you want to run on the audio.\n * @property {boolean} [startImmediately] - Pass `true` to start feature extraction immediately\n * @property {number} [numberOfMFCCCoefficients] - The number of MFCC co-efficients that the MFCC feature extractor should return\n */\n\n /**\n  * Web Audio context\n  * Either an {@link AudioContext|https://developer.mozilla.org/en-US/docs/Web/API/AudioContext}\n  * or an {@link OfflineAudioContext|https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext}\n  * @typedef {Object} AudioContext\n  */\n\n/**\n * AudioNode\n * A Web AudioNode\n * @typedef {Object} AudioNode\n */\n\n/**\n * ScriptProcessorNode\n * A Web Audio ScriptProcessorNode\n * @typedef {Object} ScriptProcessorNode\n */\n\n/**\n * @class Meyda\n * @hideconstructor\n * @classdesc\n * The schema for the default export of the Meyda library.\n * @example\n * var Meyda = require('meyda');\n */\nvar Meyda = {\n  /**\n   * Meyda stores a reference to the relevant audio context here for use inside\n   * the Web Audio API.\n   * @instance\n   * @member {AudioContext}\n   */\n  audioContext: null,\n  /**\n   * Meyda keeps an internal ScriptProcessorNode in which it runs audio feature\n   * extraction. The ScriptProcessorNode is stored in this member variable.\n   * @instance\n   * @member {ScriptProcessorNode}\n   */\n  spn: null,\n  /**\n   * The length of each buffer that Meyda will extract audio on. When recieving\n   * input via the Web Audio API, the Script Processor Node chunks incoming audio\n   * into arrays of this length. Longer buffers allow for more precision in the\n   * frequency domain, but increase the amount of time it takes for Meyda to\n   * output a set of audio features for the buffer. You can calculate how many\n   * sets of audio features Meyda will output per second by dividing the\n   * buffer size by the sample rate. If you're using Meyda for visualisation,\n   * make sure that you're collecting audio features at a rate that's faster\n   * than or equal to the video frame rate you expect.\n   * @instance\n   * @member {number}\n   */\n  bufferSize: 512,\n  /**\n   * The number of samples per second of the incoming audio. This affects\n   * feature extraction outside of the context of the Web Audio API, and must be\n   * set accurately - otherwise calculations will be off.\n   * @instance\n   * @member {number}\n   */\n  sampleRate: 44100,\n  /**\n   * The number of Mel bands to use in the Mel Frequency Cepstral Co-efficients\n   * feature extractor\n   * @instance\n   * @member {number}\n   */\n  melBands: 26,\n  /**\n   * The number of bands to divide the spectrum into for the Chroma feature\n   * extractor. 12 is the standard number of semitones per octave in the western\n   * music tradition, but Meyda can use an arbitrary number of bands, which\n   * can be useful for microtonal music.\n   * @instance\n   * @member {number}\n   */\n  chromaBands: 12,\n  /**\n   * A function you can provide that will be called for each buffer that Meyda\n   * receives from its source node\n   * @instance\n   * @member {Function}\n   */\n  callback: null,\n  /**\n   * Specify the windowing function to apply to the buffer before the\n   * transformation from the time domain to the frequency domain is performed\n   *\n   * The default windowing function is the hanning window.\n   *\n   * @instance\n   * @member {string}\n   */\n  windowingFunction: 'hanning',\n  /**\n   * @member {object}\n   */\n  featureExtractors: extractors,\n  EXTRACTION_STARTED: false,\n  /**\n   * The number of MFCC co-efficients that the MFCC feature extractor should return\n   * @instance\n   * @member {number}\n   */\n  numberOfMFCCCoefficients: 13,\n  _featuresToExtract: [],\n  windowing: utilities.applyWindow,\n  _errors: {\n    notPow2: new Error(\n        'Meyda: Buffer size must be a power of 2, e.g. 64 or 512'),\n    featureUndef: new Error('Meyda: No features defined.'),\n    invalidFeatureFmt: new Error('Meyda: Invalid feature format'),\n    invalidInput: new Error('Meyda: Invalid input.'),\n    noAC: new Error('Meyda: No AudioContext specified.'),\n    noSource: new Error('Meyda: No source node specified.'),\n  },\n\n  /**\n   * @summary\n   * Create a MeydaAnalyzer\n   *\n   * A factory function for creating a MeydaAnalyzer, the interface for using\n   * Meyda in the context of Web Audio.\n   *\n   * @method\n   * @param {MeydaOptions} options Options - an object containing configuration\n   * @returns {MeydaAnalyzer}\n   * @example\n   * const analyzer = Meyda.createMeydaAnalyzer({\n   *   \"audioContext\": audioContext,\n   *   \"source\": source,\n   *   \"bufferSize\": 512,\n   *   \"featureExtractors\": [\"rms\"],\n   *   \"inputs\": 2,\n   *   \"callback\": features => {\n   *     levelRangeElement.value = features.rms;\n   *   }\n   * });\n   */\n  createMeydaAnalyzer: function (options) {\n    return new MeydaAnalyzer(options, Object.assign({}, Meyda));\n  },\n\n  /**\n   * Extract an audio feature from a buffer\n   *\n   * Unless `meyda.windowingFunction` is set otherwise, `extract` will\n   * internally apply a hanning window to the buffer prior to conversion into\n   * the frequency domain.\n   *\n   * @function\n   * @param {(string|Array.<string>)} feature - the feature you want to extract\n   * @param {Array.<number>} signal\n   * An array of numbers that represents the signal. It should be of length\n   * `meyda.bufferSize`\n   * @param {Array.<number>} [previousSignal] - the previous buffer\n   * @returns {object} Features\n   * @example\n   * meyda.bufferSize = 2048;\n   * const features = meyda.extract(['zcr', 'spectralCentroid'], signal);\n   */\n  extract: function (feature, signal, previousSignal) {\n    if (!signal)\n        throw this._errors.invalidInput;\n    else if (typeof signal != 'object')\n        throw this._errors.invalidInput;\n    else if (!feature)\n        throw this._errors.featureUndef;\n    else if (!utilities.isPowerOfTwo(signal.length))\n        throw this._errors.notPow2;\n\n    if (typeof this.barkScale == 'undefined' ||\n            this.barkScale.length != this.bufferSize) {\n      this.barkScale = utilities.createBarkScale(\n          this.bufferSize,\n          this.sampleRate,\n          this.bufferSize\n      );\n    }\n\n    // Recalculate mel bank if buffer length changed\n    if (typeof this.melFilterBank == 'undefined' ||\n            this.barkScale.length != this.bufferSize ||\n            this.melFilterBank.length != this.melBands) {\n      this.melFilterBank = utilities.createMelFilterBank(\n          Math.max(this.melBands, this.numberOfMFCCCoefficients),\n          this.sampleRate,\n          this.bufferSize);\n    }\n\n    // Recalculate chroma bank if buffer length changed\n    if (typeof this.chromaFilterBank == 'undefined' ||\n            this.chromaFilterBank.length != this.chromaBands) {\n      this.chromaFilterBank = utilities.createChromaFilterBank(\n          this.chromaBands,\n          this.sampleRate,\n          this.bufferSize);\n    }\n\n    if (typeof signal.buffer == 'undefined') {\n      //signal is a normal array, convert to F32A\n      this.signal = utilities.arrayToTyped(signal);\n    } else {\n      this.signal = signal;\n    }\n\n    let preparedSignal = prepareSignalWithSpectrum(\n            signal,\n            this.windowingFunction,\n            this.bufferSize);\n\n    this.signal = preparedSignal.windowedSignal;\n    this.complexSpectrum = preparedSignal.complexSpectrum;\n    this.ampSpectrum = preparedSignal.ampSpectrum;\n\n    if (previousSignal) {\n      let preparedSignal = prepareSignalWithSpectrum(previousSignal,\n              this.windowingFunction,\n              this.bufferSize);\n\n      this.previousSignal = preparedSignal.windowedSignal;\n      this.previousComplexSpectrum = preparedSignal.complexSpectrum;\n      this.previousAmpSpectrum = preparedSignal.ampSpectrum;\n    }\n\n    const extract = (feature) => {\n      return this.featureExtractors[feature]({\n        ampSpectrum:this.ampSpectrum,\n        chromaFilterBank: this.chromaFilterBank,\n        complexSpectrum:this.complexSpectrum,\n        signal:this.signal,\n        bufferSize:this.bufferSize,\n        sampleRate:this.sampleRate,\n        barkScale:this.barkScale,\n        melFilterBank:this.melFilterBank,\n        previousSignal:this.previousSignal,\n        previousAmpSpectrum:this.previousAmpSpectrum,\n        previousComplexSpectrum:this.previousComplexSpectrum,\n        numberOfMFCCCoefficients:this.numberOfMFCCCoefficients,\n      });\n    };\n\n    if (typeof feature === 'object') {\n      return feature.reduce((acc, el) =>\n        Object.assign({}, acc, {\n          [el]: extract(el),\n        }), {});\n    } else if (typeof feature === 'string') {\n      return extract(feature);\n    } else {\n      throw this._errors.invalidFeatureFmt;\n    }\n  },\n};\n\nvar prepareSignalWithSpectrum = function (signal,\n  windowingFunction,\n  bufferSize) {\n  var preparedSignal = {};\n\n  if (typeof signal.buffer == 'undefined') {\n    //signal is a normal array, convert to F32A\n    preparedSignal.signal = utilities.arrayToTyped(signal);\n  }  else {\n    preparedSignal.signal = signal;\n  }\n\n  preparedSignal.windowedSignal = utilities.applyWindow(\n    preparedSignal.signal,\n    windowingFunction);\n\n  preparedSignal.complexSpectrum = fft(preparedSignal.windowedSignal);\n  preparedSignal.ampSpectrum = new Float32Array(bufferSize / 2);\n  for (var i = 0; i < bufferSize / 2; i++) {\n    preparedSignal.ampSpectrum[i] = Math.sqrt(\n      Math.pow(preparedSignal.complexSpectrum.real[i], 2) +\n      Math.pow(preparedSignal.complexSpectrum.imag[i], 2));\n  }\n\n  return preparedSignal;\n};\n\n/**\n * The Meyda class\n * @type {Meyda}\n */\nexport default Meyda;\n\nif (typeof window !== 'undefined') window.Meyda = Meyda;\n","import * as utilities from './utilities';\nimport * as featureExtractors from './featureExtractors';\n\n/**\n  * MeydaAnalyzer\n  * @classdesc\n  * Meyda's interface to the Web Audio API. MeydaAnalyzer abstracts an API on\n  * top of the Web Audio API's ScriptProcessorNode, running the Meyda audio\n  * feature extractors inside that context.\n  *\n  * MeydaAnalyzer's constructor should not be called directly - MeydaAnalyzer\n  * objects should be generated using the {@link Meyda.createMeydaAnalyzer}\n  * factory function in the main Meyda class.\n  *\n  * @example\n  * const analyzer = Meyda.createMeydaAnalyzer({\n  *   \"audioContext\": audioContext,\n  *   \"source\": source,\n  *   \"bufferSize\": 512,\n  *   \"featureExtractors\": [\"rms\"],\n  *   \"inputs\": 2,\n  *   \"numberOfMFCCCoefficients\": 20\n  *   \"callback\": features => {\n  *     levelRangeElement.value = features.rms;\n  *   }\n  * });\n  * @hideconstructor\n  */\nexport class MeydaAnalyzer {\n  constructor(options, _this) {\n    this._m = _this;\n    if (!options.audioContext) {\n      throw this._m.errors.noAC;\n    }\n    else if (options.bufferSize &&\n      !utilities.isPowerOfTwo(options.bufferSize)) {\n      throw this._m._errors.notPow2;\n    }\n    else if (!options.source) {\n      throw this._m._errors.noSource;\n    }\n\n    this._m.audioContext = options.audioContext;\n\n    // TODO: validate options\n    this._m.bufferSize = options.bufferSize || this._m.bufferSize || 256;\n    this._m.hopSize = options.hopSize || this._m.hopSize || this._m.bufferSize;\n    this._m.sampleRate = options.sampleRate\n      || this._m.audioContext.sampleRate || 44100;\n    this._m.callback = options.callback;\n    this._m.windowingFunction = options.windowingFunction || 'hanning';\n    this._m.featureExtractors = featureExtractors;\n    this._m.EXTRACTION_STARTED = options.startImmediately || false;\n    this._m.channel = typeof options.channel === 'number' ? options.channel : 0;\n    this._m.inputs = options.inputs || 1;\n    this._m.outputs = options.outputs || 1;\n    this._m.numberOfMFCCCoefficients = options.numberOfMFCCCoefficients || this._m.numberOfMFCCCoefficients || 13;\n\n    //create nodes\n    this._m.spn = this._m.audioContext.createScriptProcessor(\n      this._m.bufferSize,\n      this._m.inputs,\n      this._m.outputs);\n    this._m.spn.connect(this._m.audioContext.destination);\n\n    this._m._featuresToExtract = options.featureExtractors || [];\n\n    //always recalculate BS and MFB when a new Meyda analyzer is created.\n    this._m.barkScale = utilities.createBarkScale(\n      this._m.bufferSize,\n      this._m.sampleRate,\n      this._m.bufferSize);\n    this._m.melFilterBank = utilities.createMelFilterBank(\n      Math.max(this._m.melBands, this._m.numberOfMFCCCoefficients),\n      this._m.sampleRate,\n      this._m.bufferSize);\n\n    this._m.inputData = null;\n    this._m.previousInputData = null;\n\n    this._m.frame = null;\n    this._m.previousFrame = null;\n\n    this.setSource(options.source);\n\n    this._m.spn.onaudioprocess = (e)=> {\n      if (this._m.inputData !== null) {\n        this._m.previousInputData = this._m.inputData;\n      }\n\n      this._m.inputData = e.inputBuffer.getChannelData(this._m.channel);\n\n      if (!this._m.previousInputData) {\n        var buffer = this._m.inputData;\n      } else  {\n        var buffer = new Float32Array(this._m.previousInputData.length + this._m.inputData.length - this._m.hopSize);\n        buffer.set(this._m.previousInputData.slice(this._m.hopSize));\n        buffer.set(this._m.inputData, this._m.previousInputData.length - this._m.hopSize);\n      };\n\n      var frames = utilities.frame(buffer, this._m.bufferSize, this._m.hopSize);\n\n      frames.forEach(f => {\n        this._m.frame = f;\n\n        var features = this._m.extract(\n          this._m._featuresToExtract,\n          this._m.frame,\n          this._m.previousFrame);\n\n        // call callback if applicable\n        if (typeof this._m.callback === 'function' && this._m.EXTRACTION_STARTED) {\n          this._m.callback(features);\n        }\n\n        this._m.previousFrame = this._m.frame;\n      });\n    };\n  }\n\n  /**\n   * Start feature extraction\n   * The audio features will be passed to the callback function that was defined\n   * in the MeydaOptions that were passed to the factory when constructing the\n   * MeydaAnalyzer.\n   * @param {(string|Array.<string>)} [features]\n   * Change the features that Meyda is extracting. Defaults to the features that\n   * were set upon construction in the options parameter.\n   * @example\n   * analyzer.start('chroma');\n   */\n  start(features) {\n    this._m._featuresToExtract = features || this._m._featuresToExtract;\n    this._m.EXTRACTION_STARTED = true;\n  }\n\n  /**\n   * Stop feature extraction.\n   * @example\n   * analyzer.stop();\n   */\n  stop() {\n    this._m.EXTRACTION_STARTED = false;\n  }\n\n  /**\n   * Set the Audio Node for Meyda to listen to.\n   * @param {AudioNode} source - The Audio Node for Meyda to listen to\n   * @example\n   * analyzer.setSource(audioSourceNode);\n   */\n  setSource(source) {\n    this._m.source && this._m.source.disconnect(this._m.spn);\n    this._m.source = source;\n    this._m.source.connect(this._m.spn);\n  }\n\n  /**\n   * Set the channel of the audio node for Meyda to listen to\n   * @param {number} channel - the index of the channel on the input audio node\n   * for Meyda to listen to.\n   * @example\n   * analyzer.setChannel(0);\n   */\n  setChannel(channel) {\n    if (channel <= this._m.inputs) {\n      this._m.channel = channel;\n    } else {\n      console.error(`Channel ${channel} does not exist. Make sure you've provided a value for 'inputs' that is greater than ${channel} when instantiating the MeydaAnalyzer`);\n    }\n  }\n\n  /**\n   * Get a set of features from the current frame.\n   * @param {(string|Array.<string>)} [features]\n   * Change the features that Meyda is extracting\n   * @example\n   * analyzer.get('spectralFlatness');\n   */\n  get(features) {\n    if (this._m.inputData) {\n      return this._m.extract(\n              (features || this._m._featuresToExtract),\n              this._m.inputData,\n              this._m.previousInputData);\n    } else {\n      return null;\n    }\n  }\n}\n","import * as windowing from './windowing';\n\nlet windows = {};\n\nexport function isPowerOfTwo(num) {\n  while (((num % 2) === 0) && num > 1) {\n    num /= 2;\n  }\n\n  return (num === 1);\n}\n\nexport function error(message) {\n  throw new Error('Meyda: ' + message);\n}\n\nexport function pointwiseBufferMult(a, b) {\n  let c = [];\n  for (let i = 0; i < Math.min(a.length, b.length); i++) {\n    c[i] = a[i] * b[i];\n  }\n\n  return c;\n}\n\nexport function applyWindow(signal, windowname) {\n  if (windowname !== 'rect') {\n    if (windowname === '' || !windowname) windowname = 'hanning';\n    if (!windows[windowname]) windows[windowname] = {};\n\n    if (!windows[windowname][signal.length]) {\n      try {\n        windows[windowname][signal.length] = windowing[windowname](\n                    signal.length\n                );\n      }\n      catch (e) {\n        throw new Error('Invalid windowing function');\n      }\n    }\n\n    signal = pointwiseBufferMult(signal, windows[windowname][signal.length]);\n  }\n\n  return signal;\n}\n\nexport function createBarkScale(length, sampleRate, bufferSize) {\n  let barkScale = new Float32Array(length);\n\n  for (var i = 0; i < barkScale.length; i++) {\n    barkScale[i] = i * sampleRate / (bufferSize);\n    barkScale[i] = 13 * Math.atan(barkScale[i] / 1315.8) +\n            3.5 * Math.atan(Math.pow((barkScale[i] / 7518), 2));\n  }\n\n  return barkScale;\n}\n\nexport function typedToArray(t) {\n  // utility to convert typed arrays to normal arrays\n  return Array.prototype.slice.call(t);\n}\n\nexport function arrayToTyped(t) {\n  // utility to convert arrays to typed F32 arrays\n  return Float32Array.from(t);\n}\n\nexport function _normalize(num, range) {\n  return num / range;\n}\n\nexport function normalize(a, range) {\n  return a.map(function (n) { return _normalize(n, range); });\n}\n\nexport function normalizeToOne(a) {\n  var max = Math.max.apply(null, a);\n\n  return a.map(function (n) {\n    return n / max;\n  });\n}\n\nexport function mean(a) {\n  return a.reduce(function (prev, cur) {  return prev + cur;  }) / a.length;\n}\n\nfunction _melToFreq(melValue) {\n  var freqValue = 700 * (Math.exp(melValue / 1125) - 1);\n  return freqValue;\n}\n\nfunction _freqToMel(freqValue) {\n  var melValue = 1125 * Math.log(1 + (freqValue / 700));\n  return melValue;\n}\n\nexport function melToFreq(mV) { return _melToFreq(mV); }\n\nexport function freqToMel(fV) { return _freqToMel(fV); }\n\nexport function createMelFilterBank(numFilters, sampleRate, bufferSize) {\n  //the +2 is the upper and lower limits\n  let melValues = new Float32Array(numFilters + 2);\n  let melValuesInFreq = new Float32Array(numFilters + 2);\n\n  //Generate limits in Hz - from 0 to the nyquist.\n  let lowerLimitFreq = 0;\n  let upperLimitFreq = sampleRate / 2;\n\n  //Convert the limits to Mel\n  let lowerLimitMel = _freqToMel(lowerLimitFreq);\n  let upperLimitMel = _freqToMel(upperLimitFreq);\n\n  //Find the range\n  let range = upperLimitMel - lowerLimitMel;\n\n  //Find the range as part of the linear interpolation\n  let valueToAdd = range / (numFilters + 1);\n\n  let fftBinsOfFreq = Array(numFilters + 2);\n\n  for (let i = 0; i < melValues.length; i++) {\n    // Initialising the mel frequencies\n    // They're a linear interpolation between the lower and upper limits.\n    melValues[i] = i * valueToAdd;\n\n    // Convert back to Hz\n    melValuesInFreq[i] = _melToFreq(melValues[i]);\n\n    // Find the corresponding bins\n    fftBinsOfFreq[i] = Math.floor((bufferSize + 1) *\n                           melValuesInFreq[i] / sampleRate);\n  }\n\n  var filterBank = Array(numFilters);\n  for (let j = 0; j < filterBank.length; j++) {\n    // Create a two dimensional array of size numFilters * (buffersize/2)+1\n    // pre-populating the arrays with 0s.\n    filterBank[j] = Array.apply(\n            null,\n            new Array((bufferSize / 2) + 1)).map(Number.prototype.valueOf, 0);\n\n    //creating the lower and upper slopes for each bin\n    for (let i = fftBinsOfFreq[j]; i < fftBinsOfFreq[j + 1]; i++) {\n      filterBank[j][i] = (i - fftBinsOfFreq[j]) /\n                (fftBinsOfFreq[j + 1] - fftBinsOfFreq[j]);\n    }\n\n    for (let i = fftBinsOfFreq[j + 1]; i < fftBinsOfFreq[j + 2]; i++) {\n      filterBank[j][i] = (fftBinsOfFreq[j + 2] - i) /\n                (fftBinsOfFreq[j + 2] - fftBinsOfFreq[j + 1]);\n    }\n  }\n\n  return filterBank;\n}\n\nexport function hzToOctaves(freq, A440) {\n  return Math.log2(16 * freq / A440);\n}\n\nexport function normalizeByColumn (a) {\n  var emptyRow = a[0].map(() => 0);\n  var colDenominators = a.reduce((acc, row) => {\n    row.forEach((cell, j) => {\n      acc[j] += Math.pow(cell, 2);\n    });\n    return acc;\n  }, emptyRow).map(Math.sqrt);\n  return a.map((row, i) => row.map((v, j) => v / (colDenominators[j] || 1) ));\n};\n\nexport function createChromaFilterBank(numFilters, sampleRate, bufferSize, centerOctave=5, octaveWidth=2, baseC=true, A440=440) {\n  var numOutputBins = Math.floor(bufferSize / 2) + 1;\n\n\n  var frequencyBins = new Array(bufferSize).fill(0)\n    .map((_, i) => numFilters * hzToOctaves(sampleRate * i / bufferSize, A440));\n\n  // Set a value for the 0 Hz bin that is 1.5 octaves below bin 1\n  // (so chroma is 50% rotated from bin 1, and bin width is broad)\n  frequencyBins[0] = frequencyBins[1] - 1.5 * numFilters;\n\n  var binWidthBins = frequencyBins\n    .slice(1)\n    .map((v, i) => Math.max(v - frequencyBins[i]), 1)\n    .concat([1]);\n\n  var halfNumFilters = Math.round(numFilters / 2);\n\n  var filterPeaks = new Array(numFilters).fill(0)\n    .map((_, i) => frequencyBins.map(frq =>\n      ((10 * numFilters + halfNumFilters + frq - i) % numFilters) - halfNumFilters\n    ));\n\n  var weights = filterPeaks.map((row, i) => row.map((_, j) => (\n    Math.exp(-0.5 * Math.pow(2 * filterPeaks[i][j] / binWidthBins[j], 2))\n  )));\n\n  weights = normalizeByColumn(weights);\n\n  if (octaveWidth) {\n    var octaveWeights = frequencyBins.map(v =>\n      Math.exp(-0.5 * Math.pow((v / numFilters - centerOctave) / octaveWidth, 2))\n    );\n    weights = weights.map(row => row.map((cell, j) => cell * octaveWeights[j]));\n  }\n\n  if (baseC) {\n    weights = [...weights.slice(3), ...weights.slice(0, 3)];\n  }\n\n  return weights.map(row => row.slice(0, numOutputBins));\n}\n\nexport function frame(buffer, frameLength, hopLength) {\n  if (buffer.length < frameLength) {\n    throw new Error('Buffer is too short for frame length');\n  }\n  if (hopLength < 1) {\n    throw new Error('Hop length cannot be less that 1');\n  }\n  if (frameLength < 1) {\n    throw new Error('Frame length cannot be less that 1');\n  }\n\n  const numFrames = 1 + Math.floor((buffer.length - frameLength) / hopLength);\n\n  return new Array(numFrames).fill(0).map((_, i) =>\n    buffer.slice(i * hopLength, (i * hopLength) + frameLength));\n}\n","export function blackman(size) {\n  let blackmanBuffer = new Float32Array(size);\n  let coeff1 = 2 * Math.PI / (size - 1);\n  let coeff2 = 2 * coeff1;\n\n  //According to http://uk.mathworks.com/help/signal/ref/blackman.html\n  //first half of the window\n  for (let i = 0; i < size / 2; i++) {\n    blackmanBuffer[i] = 0.42 - 0.5 * Math.cos(i * coeff1) +\n            0.08 * Math.cos(i * coeff2);\n  }\n\n  //second half of the window\n  for (let i = size / 2; i > 0; i--) {\n    blackmanBuffer[size - i] = blackmanBuffer[i - 1];\n  }\n\n  return blackmanBuffer;\n}\n\nexport function sine(size) {\n  let coeff = Math.PI / (size - 1);\n  let sineBuffer = new Float32Array(size);\n\n  for (let i = 0; i < size; i++) {\n    sineBuffer[i] = Math.sin(coeff * i);\n  }\n\n  return sineBuffer;\n}\n\nexport function hanning(size) {\n  let hanningBuffer = new Float32Array(size);\n  for (let i = 0; i < size; i++) {\n    // According to the R documentation\n    // http://ugrad.stat.ubc.ca/R/library/e1071/html/hanning.window.html\n    hanningBuffer[i] = 0.5 - 0.5 * Math.cos(2 * Math.PI * i / (size - 1));\n  }\n\n  return hanningBuffer;\n}\n\nexport function hamming(size) {\n  let hammingBuffer = new Float32Array(size);\n  for (let i = 0; i < size; i++) {\n    //According to http://uk.mathworks.com/help/signal/ref/hamming.html\n    hammingBuffer[i] = 0.54 - 0.46 * Math.cos(2 * Math.PI * (i / size - 1));\n  }\n\n  return hammingBuffer;\n}\n"],"sourceRoot":""}