recorder.min.js

"use strict";window.AudioContext=window.AudioContext||window.webkitAudioContext,navigator.getUserMedia=navigator.getUserMedia||navigator.webkitGetUserMedia||navigator.mozGetUserMedia;var Recorder=function(e){if(!Recorder.isRecordingSupported())throw"Recording is not supported in this browser";this.config=e=e||{},this.config.command="init",this.config.bufferLength=e.bufferLength||4096,this.config.monitorGain=e.monitorGain||0,this.config.numberOfChannels=e.numberOfChannels||1,this.config.originalSampleRate=this.audioContext.sampleRate,this.config.encoderSampleRate=e.encoderSampleRate||48e3,this.config.encoderPath=e.encoderPath||"encoderWorker.min.js",this.config.streamPages=e.streamPages||!1,this.config.leaveStreamOpen=e.leaveStreamOpen||!1,this.config.maxBuffersPerPage=e.maxBuffersPerPage||40,this.config.encoderApplication=e.encoderApplication||2049,this.config.encoderFrameSize=e.encoderFrameSize||20,this.config.resampleQuality=e.resampleQuality||3,this.config.streamOptions=e.streamOptions||{optional:[],mandatory:{googEchoCancellation:!1,googAutoGainControl:!1,googNoiseSuppression:!1,googHighpassFilter:!1}},this.state="inactive",this.eventTarget=document.createDocumentFragment(),this.createAudioNodes()};Recorder.isRecordingSupported=function(){return window.AudioContext&&navigator.getUserMedia},Recorder.prototype.addEventListener=function(e,t,o){this.eventTarget.addEventListener(e,t,o)},Recorder.prototype.audioContext=new window.AudioContext,Recorder.prototype.clearStream=function(){this.stream&&(this.stream.getTracks?this.stream.getTracks().forEach(function(e){e.stop()}):this.stream.stop(),delete this.stream)},Recorder.prototype.createAudioNodes=function(){var e=this;this.scriptProcessorNode=this.audioContext.createScriptProcessor(this.config.bufferLength,this.config.numberOfChannels,this.config.numberOfChannels),this.scriptProcessorNode.onaudioprocess=function(t){e.encodeBuffers(t.inputBuffer)},this.monitorNode=this.audioContext.createGain(),this.setMonitorGain(this.config.monitorGain)},Recorder.prototype.encodeBuffers=function(e){if("recording"===this.state){for(var t=[],o=0;o<e.numberOfChannels;o++)t[o]=e.getChannelData(o);this.encoder.postMessage({command:"encode",buffers:t})}},Recorder.prototype.initStream=function(){if(this.stream)return void this.eventTarget.dispatchEvent(new Event("streamReady"));var e=this;navigator.getUserMedia({audio:this.config.streamOptions},function(t){e.stream=t,e.sourceNode=e.audioContext.createMediaStreamSource(t),e.sourceNode.connect(e.scriptProcessorNode),e.sourceNode.connect(e.monitorNode),e.eventTarget.dispatchEvent(new Event("streamReady"))},function(t){e.eventTarget.dispatchEvent(new ErrorEvent("streamError",{error:t}))})},Recorder.prototype.pause=function(){"recording"===this.state&&(this.state="paused",this.eventTarget.dispatchEvent(new Event("pause")))},Recorder.prototype.removeEventListener=function(e,t,o){this.eventTarget.removeEventListener(e,t,o)},Recorder.prototype.resume=function(){"paused"===this.state&&(this.state="recording",this.eventTarget.dispatchEvent(new Event("resume")))},Recorder.prototype.setMonitorGain=function(e){this.monitorNode.gain.value=e},Recorder.prototype.start=function(){if("inactive"===this.state&&this.stream){var e=this;this.encoder=new Worker(this.config.encoderPath),this.config.streamPages?this.encoder.addEventListener("message",function(t){e.streamPage(t.data)}):(this.recordedPages=[],this.totalLength=0,this.encoder.addEventListener("message",function(t){e.storePage(t.data)})),this.encodeBuffers=function(){delete this.encodeBuffers},this.state="recording",this.monitorNode.connect(this.audioContext.destination),this.scriptProcessorNode.connect(this.audioContext.destination),this.eventTarget.dispatchEvent(new Event("start")),this.encoder.postMessage(this.config)}},Recorder.prototype.stop=function(){"inactive"!==this.state&&(this.state="inactive",this.monitorNode.disconnect(),this.scriptProcessorNode.disconnect(),this.config.leaveStreamOpen||this.clearStream(),this.encoder.postMessage({command:"done"}))},Recorder.prototype.storePage=function(e){if(this.recordedPages.push(e),this.totalLength+=e.length,4&e[5]){for(var t=new Uint8Array(this.totalLength),o=0,i=0;i<this.recordedPages.length;i++)t.set(this.recordedPages[i],o),o+=this.recordedPages[i].length;this.eventTarget.dispatchEvent(new CustomEvent("dataAvailable",{detail:t})),this.recordedPages=[],this.eventTarget.dispatchEvent(new Event("stop"))}},Recorder.prototype.streamPage=function(e){this.eventTarget.dispatchEvent(new CustomEvent("dataAvailable",{detail:e})),4&e[5]&&this.eventTarget.dispatchEvent(new Event("stop"))};