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decoderWorker.js
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// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
var Module = typeof Module !== 'undefined' ? Module : {};
// --pre-jses are emitted after the Module integration code, so that they can
// refer to Module (if they choose; they can also define Module)
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if(typeof define === 'function' && define.amd)
define([], factory);
else if(typeof exports === 'object')
exports["DecoderWorker"] = factory();
else
root["DecoderWorker"] = factory();
})(typeof self !== 'undefined' ? self : this, function() {
return /******/ (function(modules) { // webpackBootstrap
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/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ // Flag the module as loaded
/******/ module.l = true;
/******/
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/******/ return module.exports;
/******/ }
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/******/ __webpack_require__.m = modules;
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/******/ __webpack_require__.d = function(exports, name, getter) {
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/******/ __webpack_require__.r = function(exports) {
/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
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/******/ }
/******/ Object.defineProperty(exports, '__esModule', { value: true });
/******/ };
/******/
/******/ // create a fake namespace object
/******/ // mode & 1: value is a module id, require it
/******/ // mode & 2: merge all properties of value into the ns
/******/ // mode & 4: return value when already ns object
/******/ // mode & 8|1: behave like require
/******/ __webpack_require__.t = function(value, mode) {
/******/ if(mode & 1) value = __webpack_require__(value);
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/******/ var ns = Object.create(null);
/******/ __webpack_require__.r(ns);
/******/ Object.defineProperty(ns, 'default', { enumerable: true, value: value });
/******/ if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));
/******/ return ns;
/******/ };
/******/
/******/ // getDefaultExport function for compatibility with non-harmony modules
/******/ __webpack_require__.n = function(module) {
/******/ var getter = module && module.__esModule ?
/******/ function getDefault() { return module['default']; } :
/******/ function getModuleExports() { return module; };
/******/ __webpack_require__.d(getter, 'a', getter);
/******/ return getter;
/******/ };
/******/
/******/ // Object.prototype.hasOwnProperty.call
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
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/***/ "./node_modules/webpack/buildin/global.js":
/*!***********************************!*\
!*** (webpack)/buildin/global.js ***!
\***********************************/
/*! no static exports found */
/***/ (function(module, exports) {
eval("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//# sourceURL=[module]\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,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\n//# sourceURL=webpack-internal:///./node_modules/webpack/buildin/global.js\n");
/***/ }),
/***/ "./src/decoderWorker.js":
/*!******************************!*\
!*** ./src/decoderWorker.js ***!
\******************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
eval("/* WEBPACK VAR INJECTION */(function(global) {\n\nvar decoder;\nvar mainReadyResolve;\nvar mainReady = new Promise(function (resolve) {\n mainReadyResolve = resolve;\n});\n\nglobal['onmessage'] = function (e) {\n mainReady.then(function () {\n switch (e['data']['command']) {\n case 'decode':\n if (decoder) {\n decoder.decode(e['data']['pages']);\n }\n\n break;\n\n case 'decodeRawPacket':\n if (decoder) {\n decoder.decodeRawPacket(e['data']['rawPacket']);\n }\n\n break;\n\n case 'done':\n if (decoder) {\n decoder.sendLastBuffer();\n global['close']();\n }\n\n break;\n\n case 'init':\n decoder = new OggOpusDecoder(e['data'], Module);\n break;\n\n default:\n console.warn(\"Unsupported Message\");\n // Ignore any unknown commands and continue recieving commands\n }\n });\n};\n\nvar OggOpusDecoder = function OggOpusDecoder(config, Module) {\n if (!Module) {\n throw new Error('Module with exports required to initialize a decoder instance');\n }\n\n this.mainReady = mainReady; // Expose for unit testing\n\n this.config = Object.assign({\n bufferLength: 4096,\n // Define size of outgoing buffer\n decoderSampleRate: 48000,\n // Desired decoder sample rate.\n outputBufferSampleRate: 48000,\n // Desired output sample rate. Audio will be resampled\n resampleQuality: 3 // Value between 0 and 10 inclusive. 10 being highest quality.\n\n }, config);\n this._opus_decoder_create = Module._opus_decoder_create;\n this._opus_decoder_destroy = Module._opus_decoder_destroy;\n this._speex_resampler_process_interleaved_float = Module._speex_resampler_process_interleaved_float;\n this._speex_resampler_init = Module._speex_resampler_init;\n this._speex_resampler_destroy = Module._speex_resampler_destroy;\n this._opus_decode_float = Module._opus_decode_float;\n this._free = Module._free;\n this._malloc = Module._malloc;\n this.HEAPU8 = Module.HEAPU8;\n this.HEAP32 = Module.HEAP32;\n this.HEAPF32 = Module.HEAPF32;\n this.outputBuffers = [];\n};\n\nOggOpusDecoder.prototype.decodeRawPacket = function (typedArray) {\n if (!this.inited) {\n this.numberOfChannels = typedArray[0] & 0x04 ? 2 : 1;\n this.init();\n this.inited = true;\n }\n\n this.decoderBuffer.set(typedArray); // Decode raw opus packet\n\n var outputSampleLength = this._opus_decode_float(this.decoder, this.decoderBufferPointer, typedArray.length, this.decoderOutputPointer, this.decoderOutputMaxLength, 0);\n\n var resampledLength = Math.ceil(outputSampleLength * this.config.outputBufferSampleRate / this.config.decoderSampleRate);\n this.HEAP32[this.decoderOutputLengthPointer >> 2] = outputSampleLength;\n this.HEAP32[this.resampleOutputLengthPointer >> 2] = resampledLength;\n\n this._speex_resampler_process_interleaved_float(this.resampler, this.decoderOutputPointer, this.decoderOutputLengthPointer, this.resampleOutputBufferPointer, this.resampleOutputLengthPointer);\n\n this.sendToOutputBuffers(this.HEAPF32.subarray(this.resampleOutputBufferPointer >> 2, (this.resampleOutputBufferPointer >> 2) + resampledLength * this.numberOfChannels));\n this.decoderBufferIndex = 0;\n return;\n};\n\nOggOpusDecoder.prototype.decode = function (typedArray) {\n var dataView = new DataView(typedArray.buffer);\n this.getPageBoundaries(dataView).map(function (pageStart) {\n var headerType = dataView.getUint8(pageStart + 5, true);\n var pageIndex = dataView.getUint32(pageStart + 18, true); // Beginning of stream\n\n if (headerType & 2) {\n this.numberOfChannels = dataView.getUint8(pageStart + 37, true);\n this.init();\n } // Decode page\n\n\n if (pageIndex > 1) {\n var segmentTableLength = dataView.getUint8(pageStart + 26, true);\n var segmentTableIndex = pageStart + 27 + segmentTableLength;\n\n for (var i = 0; i < segmentTableLength; i++) {\n var packetLength = dataView.getUint8(pageStart + 27 + i, true);\n this.decoderBuffer.set(typedArray.subarray(segmentTableIndex, segmentTableIndex += packetLength), this.decoderBufferIndex);\n this.decoderBufferIndex += packetLength;\n\n if (packetLength < 255) {\n var outputSampleLength = this._opus_decode_float(this.decoder, this.decoderBufferPointer, this.decoderBufferIndex, this.decoderOutputPointer, this.decoderOutputMaxLength, 0);\n\n var resampledLength = Math.ceil(outputSampleLength * this.config.outputBufferSampleRate / this.config.decoderSampleRate);\n this.HEAP32[this.decoderOutputLengthPointer >> 2] = outputSampleLength;\n this.HEAP32[this.resampleOutputLengthPointer >> 2] = resampledLength;\n\n this._speex_resampler_process_interleaved_float(this.resampler, this.decoderOutputPointer, this.decoderOutputLengthPointer, this.resampleOutputBufferPointer, this.resampleOutputLengthPointer);\n\n this.sendToOutputBuffers(this.HEAPF32.subarray(this.resampleOutputBufferPointer >> 2, (this.resampleOutputBufferPointer >> 2) + resampledLength * this.numberOfChannels));\n this.decoderBufferIndex = 0;\n }\n } // End of stream\n\n\n if (headerType & 4) {\n this.sendLastBuffer();\n }\n }\n }, this);\n};\n\nOggOpusDecoder.prototype.getPageBoundaries = function (dataView) {\n var pageBoundaries = [];\n\n for (var i = 0; i < dataView.byteLength - 32; i++) {\n if (dataView.getUint32(i, true) == 1399285583) {\n pageBoundaries.push(i);\n }\n }\n\n return pageBoundaries;\n};\n\nOggOpusDecoder.prototype.init = function () {\n this.resetOutputBuffers();\n this.initCodec();\n this.initResampler();\n};\n\nOggOpusDecoder.prototype.initCodec = function () {\n if (this.decoder) {\n this._opus_decoder_destroy(this.decoder);\n\n this._free(this.decoderBufferPointer);\n\n this._free(this.decoderOutputLengthPointer);\n\n this._free(this.decoderOutputPointer);\n }\n\n var errReference = this._malloc(4);\n\n this.decoder = this._opus_decoder_create(this.config.decoderSampleRate, this.numberOfChannels, errReference);\n\n this._free(errReference);\n\n this.decoderBufferMaxLength = 4000;\n this.decoderBufferPointer = this._malloc(this.decoderBufferMaxLength);\n this.decoderBuffer = this.HEAPU8.subarray(this.decoderBufferPointer, this.decoderBufferPointer + this.decoderBufferMaxLength);\n this.decoderBufferIndex = 0;\n this.decoderOutputLengthPointer = this._malloc(4);\n this.decoderOutputMaxLength = this.config.decoderSampleRate * this.numberOfChannels * 120 / 1000; // Max 120ms frame size\n\n this.decoderOutputPointer = this._malloc(this.decoderOutputMaxLength * 4); // 4 bytes per sample\n};\n\nOggOpusDecoder.prototype.initResampler = function () {\n if (this.resampler) {\n this._speex_resampler_destroy(this.resampler);\n\n this._free(this.resampleOutputLengthPointer);\n\n this._free(this.resampleOutputBufferPointer);\n }\n\n var errLocation = this._malloc(4);\n\n this.resampler = this._speex_resampler_init(this.numberOfChannels, this.config.decoderSampleRate, this.config.outputBufferSampleRate, this.config.resampleQuality, errLocation);\n\n this._free(errLocation);\n\n this.resampleOutputLengthPointer = this._malloc(4);\n this.resampleOutputMaxLength = Math.ceil(this.decoderOutputMaxLength * this.config.outputBufferSampleRate / this.config.decoderSampleRate);\n this.resampleOutputBufferPointer = this._malloc(this.resampleOutputMaxLength * 4); // 4 bytes per sample\n};\n\nOggOpusDecoder.prototype.resetOutputBuffers = function () {\n this.outputBuffers = [];\n this.outputBufferArrayBuffers = [];\n this.outputBufferIndex = 0;\n\n for (var i = 0; i < this.numberOfChannels; i++) {\n this.outputBuffers.push(new Float32Array(this.config.bufferLength));\n this.outputBufferArrayBuffers.push(this.outputBuffers[i].buffer);\n }\n};\n\nOggOpusDecoder.prototype.sendLastBuffer = function () {\n this.sendToOutputBuffers(new Float32Array((this.config.bufferLength - this.outputBufferIndex) * this.numberOfChannels));\n global['postMessage'](null);\n};\n\nOggOpusDecoder.prototype.sendToOutputBuffers = function (mergedBuffers) {\n var dataIndex = 0;\n var mergedBufferLength = mergedBuffers.length / this.numberOfChannels;\n\n while (dataIndex < mergedBufferLength) {\n var amountToCopy = Math.min(mergedBufferLength - dataIndex, this.config.bufferLength - this.outputBufferIndex);\n\n if (this.numberOfChannels === 1) {\n this.outputBuffers[0].set(mergedBuffers.subarray(dataIndex, dataIndex + amountToCopy), this.outputBufferIndex);\n } // Deinterleave\n else {\n for (var i = 0; i < amountToCopy; i++) {\n this.outputBuffers.forEach(function (buffer, channelIndex) {\n buffer[this.outputBufferIndex + i] = mergedBuffers[(dataIndex + i) * this.numberOfChannels + channelIndex];\n }, this);\n }\n }\n\n dataIndex += amountToCopy;\n this.outputBufferIndex += amountToCopy;\n\n if (this.outputBufferIndex == this.config.bufferLength) {\n global['postMessage'](this.outputBuffers, this.outputBufferArrayBuffers);\n this.resetOutputBuffers();\n }\n }\n};\n\nif (!Module) {\n Module = {};\n}\n\nModule['mainReady'] = mainReady;\nModule['OggOpusDecoder'] = OggOpusDecoder;\nModule['onRuntimeInitialized'] = mainReadyResolve;\nmodule.exports = Module;\n/* WEBPACK VAR INJECTION */}.call(this, __webpack_require__(/*! ./../node_modules/webpack/buildin/global.js */ \"./node_modules/webpack/buildin/global.js\")))//# sourceURL=[module]\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"./src/decoderWorker.js.js","sources":["webpack://DecoderWorker/./src/decoderWorker.js?0c45"],"sourcesContent":["\"use strict\";\n\nvar decoder;\nvar mainReadyResolve;\nvar mainReady = new Promise(function(resolve){ mainReadyResolve = resolve; });\n\nglobal['onmessage'] = function( e ){\n  mainReady.then(function(){\n    switch( e['data']['command'] ){\n\n      case 'decode':\n        if (decoder){\n          decoder.decode( e['data']['pages'] );\n        }\n        break;\n\n      case 'decodeRawPacket':\n          if (decoder){\n            decoder.decodeRawPacket( e['data']['rawPacket'] );\n          }\n          break;        \n\n      case 'done':\n        if (decoder) {\n          decoder.sendLastBuffer();\n          global['close']();\n        }\n        break;\n\n      case 'init':\n        decoder = new OggOpusDecoder( e['data'], Module );\n        break;\n\n      default:\n        console.warn(\"Unsupported Message\");\n        // Ignore any unknown commands and continue recieving commands\n    }\n  });\n};\n\nvar OggOpusDecoder = function( config, Module ){\n\n  if ( !Module ) {\n    throw new Error('Module with exports required to initialize a decoder instance');\n  }\n\n  this.mainReady = mainReady; // Expose for unit testing\n  this.config = Object.assign({ \n    bufferLength: 4096, // Define size of outgoing buffer\n    decoderSampleRate: 48000, // Desired decoder sample rate.\n    outputBufferSampleRate: 48000, // Desired output sample rate. Audio will be resampled\n    resampleQuality: 3, // Value between 0 and 10 inclusive. 10 being highest quality.\n  }, config );\n\n  this._opus_decoder_create = Module._opus_decoder_create;\n  this._opus_decoder_destroy = Module._opus_decoder_destroy;\n  this._speex_resampler_process_interleaved_float = Module._speex_resampler_process_interleaved_float;\n  this._speex_resampler_init = Module._speex_resampler_init;\n  this._speex_resampler_destroy = Module._speex_resampler_destroy;\n  this._opus_decode_float = Module._opus_decode_float;\n  this._free = Module._free;\n  this._malloc = Module._malloc;\n  this.HEAPU8 = Module.HEAPU8;\n  this.HEAP32 = Module.HEAP32;\n  this.HEAPF32 = Module.HEAPF32;\n\n  this.outputBuffers = [];\n};\n\nOggOpusDecoder.prototype.decodeRawPacket = function(typedArray) {\n    if (!this.inited) {\n      this.numberOfChannels = typedArray[0] & 0x04 ? 2 : 1;\n      this.init();\n      this.inited = true;\n    }\n    this.decoderBuffer.set( typedArray );\n\n    // Decode raw opus packet\n    var outputSampleLength = this._opus_decode_float( this.decoder, this.decoderBufferPointer, typedArray.length, this.decoderOutputPointer, this.decoderOutputMaxLength, 0);\n    var resampledLength = Math.ceil( outputSampleLength * this.config.outputBufferSampleRate / this.config.decoderSampleRate );\n    this.HEAP32[ this.decoderOutputLengthPointer >> 2 ] = outputSampleLength;\n    this.HEAP32[ this.resampleOutputLengthPointer >> 2 ] = resampledLength;\n    this._speex_resampler_process_interleaved_float( this.resampler, this.decoderOutputPointer, this.decoderOutputLengthPointer, this.resampleOutputBufferPointer, this.resampleOutputLengthPointer );\n    this.sendToOutputBuffers( this.HEAPF32.subarray( this.resampleOutputBufferPointer >> 2, (this.resampleOutputBufferPointer >> 2) + resampledLength * this.numberOfChannels ) );\n    this.decoderBufferIndex = 0;\n\n    return;  \n}\n\nOggOpusDecoder.prototype.decode = function( typedArray ) {\n  var dataView = new DataView( typedArray.buffer );\n  this.getPageBoundaries( dataView ).map( function( pageStart ) {\n    var headerType = dataView.getUint8( pageStart + 5, true );\n    var pageIndex = dataView.getUint32( pageStart + 18, true );\n\n    // Beginning of stream\n    if ( headerType & 2 ) {\n      this.numberOfChannels = dataView.getUint8( pageStart + 37, true );\n      this.init();\n    }\n\n    // Decode page\n    if ( pageIndex > 1 ) {\n      var segmentTableLength = dataView.getUint8( pageStart + 26, true );\n      var segmentTableIndex = pageStart + 27 + segmentTableLength;\n\n      for ( var i = 0; i < segmentTableLength; i++ ) {\n        var packetLength = dataView.getUint8( pageStart + 27 + i, true );\n        this.decoderBuffer.set( typedArray.subarray( segmentTableIndex, segmentTableIndex += packetLength ), this.decoderBufferIndex );\n        this.decoderBufferIndex += packetLength;\n\n        if ( packetLength < 255 ) {\n          var outputSampleLength = this._opus_decode_float( this.decoder, this.decoderBufferPointer, this.decoderBufferIndex, this.decoderOutputPointer, this.decoderOutputMaxLength, 0);\n          var resampledLength = Math.ceil( outputSampleLength * this.config.outputBufferSampleRate / this.config.decoderSampleRate );\n          this.HEAP32[ this.decoderOutputLengthPointer >> 2 ] = outputSampleLength;\n          this.HEAP32[ this.resampleOutputLengthPointer >> 2 ] = resampledLength;\n          this._speex_resampler_process_interleaved_float( this.resampler, this.decoderOutputPointer, this.decoderOutputLengthPointer, this.resampleOutputBufferPointer, this.resampleOutputLengthPointer );\n          this.sendToOutputBuffers( this.HEAPF32.subarray( this.resampleOutputBufferPointer >> 2, (this.resampleOutputBufferPointer >> 2) + resampledLength * this.numberOfChannels ) );\n          this.decoderBufferIndex = 0;\n        }\n      }\n\n      // End of stream\n      if ( headerType & 4 ) {\n        this.sendLastBuffer();\n      }\n    }\n  }, this );\n};\n\nOggOpusDecoder.prototype.getPageBoundaries = function( dataView ){\n  var pageBoundaries = [];\n\n  for ( var i = 0; i < dataView.byteLength - 32; i++ ) {\n    if ( dataView.getUint32( i, true ) == 1399285583 ) {\n      pageBoundaries.push( i );\n    }\n  }\n\n  return pageBoundaries;\n};\n\nOggOpusDecoder.prototype.init = function(){\n  this.resetOutputBuffers();\n  this.initCodec();\n  this.initResampler();\n};\n\nOggOpusDecoder.prototype.initCodec = function() {\n\n  if ( this.decoder ) {\n    this._opus_decoder_destroy( this.decoder );\n    this._free( this.decoderBufferPointer );\n    this._free( this.decoderOutputLengthPointer );\n    this._free( this.decoderOutputPointer );\n  }\n\n  var errReference = this._malloc( 4 );\n  this.decoder = this._opus_decoder_create( this.config.decoderSampleRate, this.numberOfChannels, errReference );\n  this._free( errReference );\n\n  this.decoderBufferMaxLength = 4000;\n  this.decoderBufferPointer = this._malloc( this.decoderBufferMaxLength );\n  this.decoderBuffer = this.HEAPU8.subarray( this.decoderBufferPointer, this.decoderBufferPointer + this.decoderBufferMaxLength );\n  this.decoderBufferIndex = 0;\n\n  this.decoderOutputLengthPointer = this._malloc( 4 );\n  this.decoderOutputMaxLength = this.config.decoderSampleRate * this.numberOfChannels * 120 / 1000; // Max 120ms frame size\n  this.decoderOutputPointer = this._malloc( this.decoderOutputMaxLength * 4 ); // 4 bytes per sample\n};\n\nOggOpusDecoder.prototype.initResampler = function() {\n\n  if ( this.resampler ) {\n    this._speex_resampler_destroy( this.resampler );\n    this._free( this.resampleOutputLengthPointer );\n    this._free( this.resampleOutputBufferPointer );\n  }\n\n  var errLocation = this._malloc( 4 );\n  this.resampler = this._speex_resampler_init( this.numberOfChannels, this.config.decoderSampleRate, this.config.outputBufferSampleRate, this.config.resampleQuality, errLocation );\n  this._free( errLocation );\n\n  this.resampleOutputLengthPointer = this._malloc( 4 );\n  this.resampleOutputMaxLength = Math.ceil( this.decoderOutputMaxLength * this.config.outputBufferSampleRate / this.config.decoderSampleRate );\n  this.resampleOutputBufferPointer = this._malloc( this.resampleOutputMaxLength * 4 ); // 4 bytes per sample\n};\n\nOggOpusDecoder.prototype.resetOutputBuffers = function(){\n  this.outputBuffers = [];\n  this.outputBufferArrayBuffers = [];\n  this.outputBufferIndex = 0;\n\n  for ( var i = 0; i < this.numberOfChannels; i++ ) {\n    this.outputBuffers.push( new Float32Array( this.config.bufferLength ) );\n    this.outputBufferArrayBuffers.push( this.outputBuffers[i].buffer );\n  }\n};\n\nOggOpusDecoder.prototype.sendLastBuffer = function(){\n  this.sendToOutputBuffers( new Float32Array( ( this.config.bufferLength - this.outputBufferIndex ) * this.numberOfChannels ) );\n  global['postMessage'](null);\n};\n\nOggOpusDecoder.prototype.sendToOutputBuffers = function( mergedBuffers ){\n  var dataIndex = 0;\n  var mergedBufferLength = mergedBuffers.length / this.numberOfChannels;\n\n  while ( dataIndex < mergedBufferLength ) {\n    var amountToCopy = Math.min( mergedBufferLength - dataIndex, this.config.bufferLength - this.outputBufferIndex );\n\n    if (this.numberOfChannels === 1) {\n      this.outputBuffers[0].set( mergedBuffers.subarray( dataIndex, dataIndex + amountToCopy ), this.outputBufferIndex );\n    }\n\n    // Deinterleave\n    else {\n      for ( var i = 0; i < amountToCopy; i++ ) {\n        this.outputBuffers.forEach( function( buffer, channelIndex ) {\n          buffer[ this.outputBufferIndex + i ] = mergedBuffers[ ( dataIndex + i ) * this.numberOfChannels + channelIndex ];\n        }, this);\n      }\n    }\n\n    dataIndex += amountToCopy;\n    this.outputBufferIndex += amountToCopy;\n\n    if ( this.outputBufferIndex == this.config.bufferLength ) {\n      global['postMessage']( this.outputBuffers, this.outputBufferArrayBuffers );\n      this.resetOutputBuffers();\n    }\n  }\n};\n\n\nif (!Module) {\n  Module = {};\n}\n\nModule['mainReady'] = mainReady;\nModule['OggOpusDecoder'] = OggOpusDecoder;\nModule['onRuntimeInitialized'] = mainReadyResolve;\n\nmodule.exports = Module;\n"],"mappings":"AAAA;AACA;AACA;AACA;AACA;AAAA;AAAA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AACA;AACA;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AA3BA;AA6BA;AACA;AACA;AACA;AAEA;AACA;AACA;AACA;AACA;AACA;AAAA;AACA;AAAA;AACA;AAAA;AACA;AAAA;AACA;AACA;AALA;AAOA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAAA;AACA;AAEA;AACA;AAAA;AACA;AACA;AACA;AAAA;AACA;AAAA;AACA;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAAA;AACA;AACA;AACA;AAAA;AACA;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AAAA;AACA;AAAA;AACA;AAAA;AACA;AACA;AACA;AACA;AAAA;AACA;AAAA;AACA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AAAA;AACA;AACA;AACA;AAEA;AACA;AACA;AAAA;AACA;AAAA;AACA;AACA;AACA;AACA;AAAA;AACA;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAFA;AAMA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AAEA;A","sourceRoot":""}\n//# sourceURL=webpack-internal:///./src/decoderWorker.js\n");
/***/ })
/******/ });
});
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// meant to overwrite the default module functionality. Here
// we collect those properties and reapply _after_ we configure
// the current environment's defaults to avoid having to be so
// defensive during initialization.
var moduleOverrides = {};
var key;
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if (Module.hasOwnProperty(key)) {
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var quit_ = function(status, toThrow) {
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var ENVIRONMENT_IS_NODE = false;
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var read_,
readAsync,
readBinary,
setWindowTitle;
var nodeFS;
var nodePath;
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scriptDirectory = require('path').dirname(scriptDirectory) + '/';
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scriptDirectory = __dirname + '/';
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filename = nodePath['normalize'](filename);
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ret = new Uint8Array(ret);
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assert(ret.buffer);
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process['on']('unhandledRejection', abort);
quit_ = function(status) {
process['exit'](status);
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Module['inspect'] = function () { return '[Emscripten Module object]'; };
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if (ENVIRONMENT_IS_SHELL) {
if (typeof read != 'undefined') {
read_ = function shell_read(f) {
return read(f);
};
}
readBinary = function readBinary(f) {
var data;
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return new Uint8Array(readbuffer(f));
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data = read(f, 'binary');
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};
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if (typeof console === 'undefined') console = /** @type{!Console} */({});
console.log = /** @type{!function(this:Console, ...*): undefined} */ (print);
console.warn = console.error = /** @type{!function(this:Console, ...*): undefined} */ (typeof printErr !== 'undefined' ? printErr : print);
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scriptDirectory = self.location.href;
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scriptDirectory = scriptDirectory.substr(0, scriptDirectory.lastIndexOf('/')+1);
} else {
scriptDirectory = '';
}
// Differentiate the Web Worker from the Node Worker case, as reading must
// be done differently.
{
read_ = function shell_read(url) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.send(null);
return xhr.responseText;
};
if (ENVIRONMENT_IS_WORKER) {
readBinary = function readBinary(url) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.responseType = 'arraybuffer';
xhr.send(null);
return new Uint8Array(/** @type{!ArrayBuffer} */(xhr.response));
};
}
readAsync = function readAsync(url, onload, onerror) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'arraybuffer';
xhr.onload = function xhr_onload() {
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onload(xhr.response);
return;
}
onerror();
};
xhr.onerror = onerror;
xhr.send(null);
};
}
setWindowTitle = function(title) { document.title = title };
} else
{
}
// Set up the out() and err() hooks, which are how we can print to stdout or
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var out = Module['print'] || console.log.bind(console);
var err = Module['printErr'] || console.warn.bind(console);
// Merge back in the overrides
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Module[key] = moduleOverrides[key];
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if (Module['arguments']) arguments_ = Module['arguments'];
if (Module['thisProgram']) thisProgram = Module['thisProgram'];
if (Module['quit']) quit_ = Module['quit'];
// perform assertions in shell.js after we set up out() and err(), as otherwise if an assertion fails it cannot print the message
// {{PREAMBLE_ADDITIONS}}
var STACK_ALIGN = 16;
function dynamicAlloc(size) {
var ret = HEAP32[DYNAMICTOP_PTR>>2];
var end = (ret + size + 15) & -16;
HEAP32[DYNAMICTOP_PTR>>2] = end;
return ret;
}
function alignMemory(size, factor) {
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function getNativeTypeSize(type) {
switch (type) {
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case 'i32': return 4;
case 'i64': return 8;
case 'float': return 4;
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default: {
if (type[type.length-1] === '*') {
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var bits = Number(type.substr(1));
assert(bits % 8 === 0, 'getNativeTypeSize invalid bits ' + bits + ', type ' + type);
return bits / 8;
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return 0;
}
}
}
}
function warnOnce(text) {
if (!warnOnce.shown) warnOnce.shown = {};
if (!warnOnce.shown[text]) {
warnOnce.shown[text] = 1;
err(text);
}
}
var asm2wasmImports = { // special asm2wasm imports
"f64-rem": function(x, y) {
return x % y;
},
"debugger": function() {
}
};
var jsCallStartIndex = 1;
var functionPointers = new Array(0);
// Wraps a JS function as a wasm function with a given signature.
function convertJsFunctionToWasm(func, sig) {
// If the type reflection proposal is available, use the new
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// Otherwise, construct a minimal wasm module importing the JS function and
// re-exporting it.
if (typeof WebAssembly.Function === "function") {
var typeNames = {
'i': 'i32',
'j': 'i64',
'f': 'f32',
'd': 'f64'
};
var type = {
parameters: [],
results: sig[0] == 'v' ? [] : [typeNames[sig[0]]]
};
for (var i = 1; i < sig.length; ++i) {
type.parameters.push(typeNames[sig[i]]);
}
return new WebAssembly.Function(type, func);
}
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// generated based on the signature passed in.
var typeSection = [
0x01, // id: section,
0x00, // length: 0 (placeholder)
0x01, // count: 1
0x60, // form: func
];
var sigRet = sig.slice(0, 1);
var sigParam = sig.slice(1);
var typeCodes = {
'i': 0x7f, // i32
'j': 0x7e, // i64
'f': 0x7d, // f32
'd': 0x7c, // f64
};
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typeSection.push(sigParam.length);
for (var i = 0; i < sigParam.length; ++i) {
typeSection.push(typeCodes[sigParam[i]]);
}
// Return values, length + signatures
// With no multi-return in MVP, either 0 (void) or 1 (anything else)
if (sigRet == 'v') {
typeSection.push(0x00);
} else {
typeSection = typeSection.concat([0x01, typeCodes[sigRet]]);
}
// Write the overall length of the type section back into the section header
// (excepting the 2 bytes for the section id and length)
typeSection[1] = typeSection.length - 2;
// Rest of the module is static
var bytes = new Uint8Array([
0x00, 0x61, 0x73, 0x6d, // magic ("\0asm")
0x01, 0x00, 0x00, 0x00, // version: 1
].concat(typeSection, [
0x02, 0x07, // import section
// (import "e" "f" (func 0 (type 0)))
0x01, 0x01, 0x65, 0x01, 0x66, 0x00, 0x00,
0x07, 0x05, // export section
// (export "f" (func 0 (type 0)))
0x01, 0x01, 0x66, 0x00, 0x00,
]));
// We can compile this wasm module synchronously because it is very small.
// This accepts an import (at "e.f"), that it reroutes to an export (at "f")
var module = new WebAssembly.Module(bytes);
var instance = new WebAssembly.Instance(module, {
'e': {
'f': func
}
});
var wrappedFunc = instance.exports['f'];
return wrappedFunc;
}
var freeTableIndexes = [];
// Weak map of functions in the table to their indexes, created on first use.
var functionsInTableMap;
// Add a wasm function to the table.
function addFunctionWasm(func, sig) {
var table = wasmTable;
// Check if the function is already in the table, to ensure each function
// gets a unique index. First, create the map if this is the first use.
if (!functionsInTableMap) {
functionsInTableMap = new WeakMap();
for (var i = 0; i < table.length; i++) {
var item = table.get(i);
// Ignore null values.
if (item) {
functionsInTableMap.set(item, i);
}
}
}
if (functionsInTableMap.has(func)) {
return functionsInTableMap.get(func);
}
// It's not in the table, add it now.
var ret;
// Reuse a free index if there is one, otherwise grow.
if (freeTableIndexes.length) {
ret = freeTableIndexes.pop();
} else {
ret = table.length;
// Grow the table
try {
table.grow(1);
} catch (err) {
if (!(err instanceof RangeError)) {
throw err;
}
throw 'Unable to grow wasm table. Use a higher value for RESERVED_FUNCTION_POINTERS or set ALLOW_TABLE_GROWTH.';
}
}
// Set the new value.
try {
// Attempting to call this with JS function will cause of table.set() to fail
table.set(ret, func);
} catch (err) {
if (!(err instanceof TypeError)) {
throw err;
}
var wrapped = convertJsFunctionToWasm(func, sig);
table.set(ret, wrapped);
}
functionsInTableMap.set(func, ret);
return ret;
}
function removeFunctionWasm(index) {
functionsInTableMap.delete(wasmTable.get(index));
freeTableIndexes.push(index);
}
// 'sig' parameter is required for the llvm backend but only when func is not
// already a WebAssembly function.
function addFunction(func, sig) {
var base = 0;
for (var i = base; i < base + 0; i++) {
if (!functionPointers[i]) {
functionPointers[i] = func;
return jsCallStartIndex + i;
}
}
throw 'Finished up all reserved function pointers. Use a higher value for RESERVED_FUNCTION_POINTERS.';
}
function removeFunction(index) {
functionPointers[index-jsCallStartIndex] = null;
}
var funcWrappers = {};
function getFuncWrapper(func, sig) {
if (!func) return; // on null pointer, return undefined
assert(sig);
if (!funcWrappers[sig]) {
funcWrappers[sig] = {};
}
var sigCache = funcWrappers[sig];
if (!sigCache[func]) {
// optimize away arguments usage in common cases
if (sig.length === 1) {
sigCache[func] = function dynCall_wrapper() {
return dynCall(sig, func);
};
} else if (sig.length === 2) {
sigCache[func] = function dynCall_wrapper(arg) {
return dynCall(sig, func, [arg]);
};
} else {
// general case
sigCache[func] = function dynCall_wrapper() {
return dynCall(sig, func, Array.prototype.slice.call(arguments));
};
}
}
return sigCache[func];
}
function makeBigInt(low, high, unsigned) {
return unsigned ? ((+((low>>>0)))+((+((high>>>0)))*4294967296.0)) : ((+((low>>>0)))+((+((high|0)))*4294967296.0));
}
/** @param {Array=} args */
function dynCall(sig, ptr, args) {
if (args && args.length) {
return Module['dynCall_' + sig].apply(null, [ptr].concat(args));
} else {
return Module['dynCall_' + sig].call(null, ptr);
}
}
var tempRet0 = 0;
var setTempRet0 = function(value) {
tempRet0 = value;
};
var getTempRet0 = function() {
return tempRet0;
};
// The address globals begin at. Very low in memory, for code size and optimization opportunities.
// Above 0 is static memory, starting with globals.
// Then the stack.
// Then 'dynamic' memory for sbrk.
var GLOBAL_BASE = 1024;
// === Preamble library stuff ===
// Documentation for the public APIs defined in this file must be updated in:
// site/source/docs/api_reference/preamble.js.rst
// A prebuilt local version of the documentation is available at:
// site/build/text/docs/api_reference/preamble.js.txt
// You can also build docs locally as HTML or other formats in site/
// An online HTML version (which may be of a different version of Emscripten)
// is up at http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html
var wasmBinary;if (Module['wasmBinary']) wasmBinary = Module['wasmBinary'];
var noExitRuntime;if (Module['noExitRuntime']) noExitRuntime = Module['noExitRuntime'];
if (typeof WebAssembly !== 'object') {
abort('no native wasm support detected');
}
// In MINIMAL_RUNTIME, setValue() and getValue() are only available when building with safe heap enabled, for heap safety checking.
// In traditional runtime, setValue() and getValue() are always available (although their use is highly discouraged due to perf penalties)
/** @param {number} ptr
@param {number} value
@param {string} type
@param {number|boolean=} noSafe */
function setValue(ptr, value, type, noSafe) {
type = type || 'i8';
if (type.charAt(type.length-1) === '*') type = 'i32'; // pointers are 32-bit
switch(type) {
case 'i1': HEAP8[((ptr)>>0)]=value; break;
case 'i8': HEAP8[((ptr)>>0)]=value; break;
case 'i16': HEAP16[((ptr)>>1)]=value; break;
case 'i32': HEAP32[((ptr)>>2)]=value; break;
case 'i64': (tempI64 = [value>>>0,(tempDouble=value,(+(Math_abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math_min((+(Math_floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math_ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[((ptr)>>2)]=tempI64[0],HEAP32[(((ptr)+(4))>>2)]=tempI64[1]); break;
case 'float': HEAPF32[((ptr)>>2)]=value; break;
case 'double': HEAPF64[((ptr)>>3)]=value; break;
default: abort('invalid type for setValue: ' + type);
}
}
/** @param {number} ptr
@param {string} type
@param {number|boolean=} noSafe */
function getValue(ptr, type, noSafe) {
type = type || 'i8';
if (type.charAt(type.length-1) === '*') type = 'i32'; // pointers are 32-bit
switch(type) {
case 'i1': return HEAP8[((ptr)>>0)];
case 'i8': return HEAP8[((ptr)>>0)];
case 'i16': return HEAP16[((ptr)>>1)];
case 'i32': return HEAP32[((ptr)>>2)];
case 'i64': return HEAP32[((ptr)>>2)];
case 'float': return HEAPF32[((ptr)>>2)];
case 'double': return HEAPF64[((ptr)>>3)];
default: abort('invalid type for getValue: ' + type);
}
return null;
}
// Wasm globals
var wasmMemory;
// In fastcomp asm.js, we don't need a wasm Table at all.
// In the wasm backend, we polyfill the WebAssembly object,
// so this creates a (non-native-wasm) table for us.
var wasmTable = new WebAssembly.Table({
'initial': 484,
'maximum': 484,
'element': 'anyfunc'
});
//========================================
// Runtime essentials
//========================================
// whether we are quitting the application. no code should run after this.
// set in exit() and abort()
var ABORT = false;
// set by exit() and abort(). Passed to 'onExit' handler.
// NOTE: This is also used as the process return code code in shell environments
// but only when noExitRuntime is false.
var EXITSTATUS = 0;
/** @type {function(*, string=)} */
function assert(condition, text) {
if (!condition) {
abort('Assertion failed: ' + text);
}
}
// Returns the C function with a specified identifier (for C++, you need to do manual name mangling)
function getCFunc(ident) {
var func = Module['_' + ident]; // closure exported function
assert(func, 'Cannot call unknown function ' + ident + ', make sure it is exported');
return func;
}
// C calling interface.
/** @param {string|null=} returnType
@param {Array=} argTypes
@param {Arguments|Array=} args
@param {Object=} opts */
function ccall(ident, returnType, argTypes, args, opts) {
// For fast lookup of conversion functions
var toC = {
'string': function(str) {
var ret = 0;
if (str !== null && str !== undefined && str !== 0) { // null string
// at most 4 bytes per UTF-8 code point, +1 for the trailing '\0'
var len = (str.length << 2) + 1;
ret = stackAlloc(len);
stringToUTF8(str, ret, len);
}
return ret;
},
'array': function(arr) {
var ret = stackAlloc(arr.length);
writeArrayToMemory(arr, ret);
return ret;
}
};
function convertReturnValue(ret) {
if (returnType === 'string') return UTF8ToString(ret);
if (returnType === 'boolean') return Boolean(ret);
return ret;
}
var func = getCFunc(ident);
var cArgs = [];
var stack = 0;
if (args) {
for (var i = 0; i < args.length; i++) {
var converter = toC[argTypes[i]];
if (converter) {
if (stack === 0) stack = stackSave();
cArgs[i] = converter(args[i]);
} else {
cArgs[i] = args[i];
}
}
}
var ret = func.apply(null, cArgs);
ret = convertReturnValue(ret);
if (stack !== 0) stackRestore(stack);
return ret;
}
/** @param {string=} returnType
@param {Array=} argTypes
@param {Object=} opts */
function cwrap(ident, returnType, argTypes, opts) {
argTypes = argTypes || [];
// When the function takes numbers and returns a number, we can just return
// the original function
var numericArgs = argTypes.every(function(type){ return type === 'number'});
var numericRet = returnType !== 'string';
if (numericRet && numericArgs && !opts) {
return getCFunc(ident);
}
return function() {
return ccall(ident, returnType, argTypes, arguments, opts);
}
}
var ALLOC_NORMAL = 0; // Tries to use _malloc()
var ALLOC_STACK = 1; // Lives for the duration of the current function call
var ALLOC_DYNAMIC = 2; // Cannot be freed except through sbrk
var ALLOC_NONE = 3; // Do not allocate
// allocate(): This is for internal use. You can use it yourself as well, but the interface
// is a little tricky (see docs right below). The reason is that it is optimized
// for multiple syntaxes to save space in generated code. So you should
// normally not use allocate(), and instead allocate memory using _malloc(),
// initialize it with setValue(), and so forth.
// @slab: An array of data, or a number. If a number, then the size of the block to allocate,
// in *bytes* (note that this is sometimes confusing: the next parameter does not
// affect this!)
// @types: Either an array of types, one for each byte (or 0 if no type at that position),
// or a single type which is used for the entire block. This only matters if there
// is initial data - if @slab is a number, then this does not matter at all and is
// ignored.
// @allocator: How to allocate memory, see ALLOC_*
/** @type {function((TypedArray|Array<number>|number), string, number, number=)} */
function allocate(slab, types, allocator, ptr) {
var zeroinit, size;
if (typeof slab === 'number') {
zeroinit = true;
size = slab;
} else {
zeroinit = false;
size = slab.length;
}
var singleType = typeof types === 'string' ? types : null;
var ret;
if (allocator == ALLOC_NONE) {
ret = ptr;
} else {
ret = [_malloc,
stackAlloc,
dynamicAlloc][allocator](Math.max(size, singleType ? 1 : types.length));
}
if (zeroinit) {
var stop;
ptr = ret;
assert((ret & 3) == 0);
stop = ret + (size & ~3);
for (; ptr < stop; ptr += 4) {
HEAP32[((ptr)>>2)]=0;
}
stop = ret + size;
while (ptr < stop) {
HEAP8[((ptr++)>>0)]=0;
}
return ret;
}
if (singleType === 'i8') {
if (slab.subarray || slab.slice) {
HEAPU8.set(/** @type {!Uint8Array} */ (slab), ret);
} else {
HEAPU8.set(new Uint8Array(slab), ret);
}
return ret;
}
var i = 0, type, typeSize, previousType;
while (i < size) {
var curr = slab[i];
type = singleType || types[i];
if (type === 0) {
i++;
continue;
}
if (type == 'i64') type = 'i32'; // special case: we have one i32 here, and one i32 later
setValue(ret+i, curr, type);
// no need to look up size unless type changes, so cache it
if (previousType !== type) {
typeSize = getNativeTypeSize(type);
previousType = type;
}
i += typeSize;
}
return ret;
}
// Allocate memory during any stage of startup - static memory early on, dynamic memory later, malloc when ready
function getMemory(size) {
if (!runtimeInitialized) return dynamicAlloc(size);
return _malloc(size);
}
// runtime_strings.js: Strings related runtime functions that are part of both MINIMAL_RUNTIME and regular runtime.
// Given a pointer 'ptr' to a null-terminated UTF8-encoded string in the given array that contains uint8 values, returns
// a copy of that string as a Javascript String object.
var UTF8Decoder = typeof TextDecoder !== 'undefined' ? new TextDecoder('utf8') : undefined;
/**
* @param {number} idx
* @param {number=} maxBytesToRead
* @return {string}
*/
function UTF8ArrayToString(heap, idx, maxBytesToRead) {
var endIdx = idx + maxBytesToRead;
var endPtr = idx;
// TextDecoder needs to know the byte length in advance, it doesn't stop on null terminator by itself.
// Also, use the length info to avoid running tiny strings through TextDecoder, since .subarray() allocates garbage.
// (As a tiny code save trick, compare endPtr against endIdx using a negation, so that undefined means Infinity)
while (heap[endPtr] && !(endPtr >= endIdx)) ++endPtr;