polyfill.js

(()=>{"use strict";let t,e=window.AudioContext||window.webkitAudioContext,s=t=>{let e=new Event("error");return e.data=new Error("Wrong state for "+t),e};class i{constructor(t,e=null){this.stream=t,this.config=e,this.state="inactive",this.em=document.createDocumentFragment(),this.encoder=(t=>{let e=t.toString().replace(/^(\(\)\s*=>|function\s*\(\))\s*{/,"").replace(/}$/,""),s=new Blob([e]);return new Worker(URL.createObjectURL(s))})(i.encoder);let s=this;this.encoder.addEventListener("message",(t=>{let e=new Event("dataavailable");e.data=new Blob([t.data],{type:s.mimeType}),s.em.dispatchEvent(e),"inactive"===s.state&&s.em.dispatchEvent(new Event("stop"))}))}start(i){if("inactive"!==this.state)return this.em.dispatchEvent(s("start"));this.state="recording",t||(t=new e(this.config)),this.clone=this.stream.clone(),this.input=t.createMediaStreamSource(this.clone),this.processor=t.createScriptProcessor(2048,1,1),this.encoder.postMessage(["init",t.sampleRate]),this.processor.onaudioprocess=t=>{"recording"===this.state&&this.encoder.postMessage(["encode",t.inputBuffer.getChannelData(0)])},this.input.connect(this.processor),this.processor.connect(t.destination),this.em.dispatchEvent(new Event("start")),i&&(this.slicing=setInterval((()=>{"recording"===this.state&&this.requestData()}),i))}stop(){return"inactive"===this.state?this.em.dispatchEvent(s("stop")):(this.requestData(),this.state="inactive",this.clone.getTracks().forEach((t=>{t.stop()})),this.processor.disconnect(),this.input.disconnect(),clearInterval(this.slicing))}pause(){return"recording"!==this.state?this.em.dispatchEvent(s("pause")):(this.state="paused",this.em.dispatchEvent(new Event("pause")))}resume(){return"paused"!==this.state?this.em.dispatchEvent(s("resume")):(this.state="recording",this.em.dispatchEvent(new Event("resume")))}requestData(){return"inactive"===this.state?this.em.dispatchEvent(s("requestData")):this.encoder.postMessage(["dump",t.sampleRate])}addEventListener(...t){this.em.addEventListener(...t)}removeEventListener(...t){this.em.removeEventListener(...t)}dispatchEvent(...t){this.em.dispatchEvent(...t)}}i.prototype.mimeType="audio/wav",i.isTypeSupported=t=>i.prototype.mimeType===t,i.notSupported=!navigator.mediaDevices||!e,i.encoder=()=>{let t=[];onmessage=e=>{"encode"===e.data[0]?function(e){let s=e.length,i=new Uint8Array(2*s);for(let t=0;t<s;t++){let s=2*t,n=e[t];n>1?n=1:n<-1&&(n=-1),n*=32768,i[s]=n,i[s+1]=n>>8}t.push(i)}(e.data[1]):"dump"===e.data[0]&&function(e){let s=t.length?t[0].length:0,i=t.length*s,n=new Uint8Array(44+i),a=new DataView(n.buffer);a.setUint32(0,1380533830,!1),a.setUint32(4,36+i,!0),a.setUint32(8,1463899717,!1),a.setUint32(12,1718449184,!1),a.setUint32(16,16,!0),a.setUint16(20,1,!0),a.setUint16(22,1,!0),a.setUint32(24,e,!0),a.setUint32(28,2*e,!0),a.setUint16(32,2,!0),a.setUint16(34,16,!0),a.setUint32(36,1684108385,!1),a.setUint32(40,i,!0);for(let e=0;e<t.length;e++)n.set(t[e],e*s+44);t=[],postMessage(n.buffer,[n.buffer])}(e.data[1])}};const n=i;console.log("using polyfill"),window.MediaRecorder=n})();