User:Brijsri/recorder.js

/* Matt Diamond's Recorder.js -- START */ (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.Recorder = f}})(function{var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){ "use strict";

module.exports = require("./recorder").Recorder;

},{"./recorder":2}],2:[function(require,module,exports){ 'use strict';

var _createClass = (function {    function defineProperties(target, props) {        for (var i = 0; i < props.length; i++) {            var descriptor = props[i];descriptor.enumerable = descriptor.enumerable || false;descriptor.configurable = true;if ("value" in descriptor) descriptor.writable = true;Object.defineProperty(target, descriptor.key, descriptor);        }    }return function (Constructor, protoProps, staticProps) {        if (protoProps) defineProperties(Constructor.prototype, protoProps);if (staticProps) defineProperties(Constructor, staticProps);return Constructor;    }; });

Object.defineProperty(exports, "__esModule", {   value: true }); exports.Recorder = undefined;

var _inlineWorker = require('inline-worker');

var _inlineWorker2 = _interopRequireDefault(_inlineWorker);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Recorder = exports.Recorder = (function {    function Recorder(source, cfg) {        var _this = this;

_classCallCheck(this, Recorder);

this.config = { bufferLen: 4096, numChannels: 2, mimeType: 'audio/wav' };       this.recording = false; this.callbacks = { getBuffer: [], exportWAV: [] };

Object.assign(this.config, cfg); this.context = source.context; this.node = (this.context.createScriptProcessor || this.context.createJavaScriptNode).call(this.context, this.config.bufferLen, this.config.numChannels, this.config.numChannels);

this.node.onaudioprocess = function (e) { if (!_this.recording) return;

var buffer = []; for (var channel = 0; channel < _this.config.numChannels; channel++) { buffer.push(e.inputBuffer.getChannelData(channel)); }           _this.worker.postMessage({                command: 'record',                buffer: buffer            }); };

source.connect(this.node); this.node.connect(this.context.destination); //this should not be necessary

var self = {}; this.worker = new _inlineWorker2.default(function {            var recLength = 0,                recBuffers = [],                sampleRate = undefined,                numChannels = undefined;

self.onmessage = function (e) { switch (e.data.command) { case 'init': init(e.data.config); break; case 'record': record(e.data.buffer); break; case 'exportWAV': exportWAV(e.data.type); break; case 'getBuffer': getBuffer; break; case 'clear': clear; break; }           };

function init(config) { sampleRate = config.sampleRate; numChannels = config.numChannels; initBuffers; }

function record(inputBuffer) { for (var channel = 0; channel < numChannels; channel++) { recBuffers[channel].push(inputBuffer[channel]); }               recLength += inputBuffer[0].length; }

function exportWAV(type) { var buffers = []; for (var channel = 0; channel < numChannels; channel++) { buffers.push(mergeBuffers(recBuffers[channel], recLength)); }               var interleaved = undefined; if (numChannels === 2) { interleaved = interleave(buffers[0], buffers[1]); } else { interleaved = buffers[0]; }               var dataview = encodeWAV(interleaved); var audioBlob = new Blob([dataview], { type: type });

self.postMessage({ command: 'exportWAV', data: audioBlob }); }

function getBuffer { var buffers = []; for (var channel = 0; channel < numChannels; channel++) { buffers.push(mergeBuffers(recBuffers[channel], recLength)); }               self.postMessage({ command: 'getBuffer', data: buffers }); }

function clear { recLength = 0; recBuffers = []; initBuffers; }

function initBuffers { for (var channel = 0; channel < numChannels; channel++) { recBuffers[channel] = []; }           }

function mergeBuffers(recBuffers, recLength) { var result = new Float32Array(recLength); var offset = 0; for (var i = 0; i < recBuffers.length; i++) { result.set(recBuffers[i], offset); offset += recBuffers[i].length; }               return result; }

function interleave(inputL, inputR) { var length = inputL.length + inputR.length; var result = new Float32Array(length);

var index = 0, inputIndex = 0;

while (index < length) { result[index++] = inputL[inputIndex]; result[index++] = inputR[inputIndex]; inputIndex++; }               return result; }

function floatTo16BitPCM(output, offset, input) { for (var i = 0; i < input.length; i++, offset += 2) { var s = Math.max(-1, Math.min(1, input[i])); output.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true); }           }

function writeString(view, offset, string) { for (var i = 0; i < string.length; i++) { view.setUint8(offset + i, string.charCodeAt(i)); }           }

function encodeWAV(samples) { var buffer = new ArrayBuffer(44 + samples.length * 2); var view = new DataView(buffer);

/* RIFF identifier */ writeString(view, 0, 'RIFF'); /* RIFF chunk length */ view.setUint32(4, 36 + samples.length * 2, true); /* RIFF type */ writeString(view, 8, 'WAVE'); /* format chunk identifier */ writeString(view, 12, 'fmt '); /* format chunk length */ view.setUint32(16, 16, true); /* sample format (raw) */ view.setUint16(20, 1, true); /* channel count */ view.setUint16(22, numChannels, true); /* sample rate */ view.setUint32(24, sampleRate, true); /* byte rate (sample rate * block align) */ view.setUint32(28, sampleRate * 4, true); /* block align (channel count * bytes per sample) */ view.setUint16(32, numChannels * 2, true); /* bits per sample */ view.setUint16(34, 16, true); /* data chunk identifier */ writeString(view, 36, 'data'); /* data chunk length */ view.setUint32(40, samples.length * 2, true);

floatTo16BitPCM(view, 44, samples);

return view; }       }, self);

this.worker.postMessage({           command: 'init',            config: {                sampleRate: this.context.sampleRate,                numChannels: this.config.numChannels            }        });

this.worker.onmessage = function (e) { var cb = _this.callbacks[e.data.command].pop; if (typeof cb == 'function') { cb(e.data.data); }       };    }

_createClass(Recorder, [{       key: 'record',        value: function record {            this.recording = true;        }    }, {        key: 'stop',        value: function stop {            this.recording = false;        }    }, {        key: 'clear',        value: function clear {            this.worker.postMessage({ command: 'clear' });        }    }, {        key: 'getBuffer',        value: function getBuffer(cb) {            cb = cb || this.config.callback;            if (!cb) throw new Error('Callback not set');

this.callbacks.getBuffer.push(cb);

this.worker.postMessage({ command: 'getBuffer' }); }   }, {        key: 'exportWAV', value: function exportWAV(cb, mimeType) { mimeType = mimeType || this.config.mimeType; cb = cb || this.config.callback; if (!cb) throw new Error('Callback not set');

this.callbacks.exportWAV.push(cb);

this.worker.postMessage({               command: 'exportWAV',                type: mimeType            }); }   }], [{        key: 'forceDownload', value: function forceDownload(blob, filename) { var url = (window.URL || window.webkitURL).createObjectURL(blob); var link = window.document.createElement('a'); link.href = url; link.download = filename || 'output.wav'; var click = document.createEvent("Event"); click.initEvent("click", true, true); link.dispatchEvent(click); }   }]);

return Recorder; });

exports.default = Recorder;

},{"inline-worker":3}],3:[function(require,module,exports){ "use strict";

module.exports = require("./inline-worker"); },{"./inline-worker":4}],4:[function(require,module,exports){ (function (global){ "use strict";

var _createClass = (function { function defineProperties(target, props) { for (var key in props) { var prop = props[key]; prop.configurable = true; if (prop.value) prop.writable = true; } Object.defineProperties(target, props); } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; });

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

var WORKER_ENABLED = !!(global === global.window && global.URL && global.Blob && global.Worker);

var InlineWorker = (function {  function InlineWorker(func, self) {    var _this = this;

_classCallCheck(this, InlineWorker);

if (WORKER_ENABLED) { var functionBody = func.toString.trim.match(/^function\s*\w*\s*\([\w\s,]*\)\s*{([\w\W]*?)}$/)[1]; var url = global.URL.createObjectURL(new global.Blob([functionBody], { type: "text/javascript" }));

return new global.Worker(url); }

this.self = self; this.self.postMessage = function (data) { setTimeout(function {        _this.onmessage({ data: data });      }, 0); };

setTimeout(function {      func.call(self);    }, 0); }

_createClass(InlineWorker, {   postMessage: {      value: function postMessage(data) {        var _this = this;

setTimeout(function {          _this.self.onmessage({ data: data });        }, 0); }   }  });

return InlineWorker; });

module.exports = InlineWorker; }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}) },{}]},{},[1])(1) }); /* Matt Diamond's Recorder.js -- END */