├── .gitignore
├── .prettierrc
├── LICENSE
├── README.md
├── package-lock.json
├── package.json
├── public
    ├── assemblyai-voice-helper.js
    ├── index.html
    └── main.js
├── src
    ├── index.js
    ├── lib
    │   ├── assemblyai.js
    │   ├── microphone.js
    │   ├── recorder.js
    │   ├── request.js
    │   └── vad.js
    └── scss
    │   └── main.scss
└── webpack.config.js


/.gitignore:
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1 | node_modules/
2 | 
3 | .firebase/
4 | .firebaserc
5 | firebase.json


--------------------------------------------------------------------------------
/.prettierrc:
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1 | {
2 |   "tabWidth": 2,
3 |   "singleQuote": true,
4 |   "trailingComma": "none",
5 |   "arrowParens": "avoid"
6 | }
7 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2020 AssemblyAI, INC.
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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  1 | # AssemblyAI Voice Search Widget
  2 | 
  3 | Using this widget, you can effortlessly add voice search to your website and/or app. 
  4 | 
  5 | - [Getting Started](#getting-started)
  6 | - [Supported Platforms/Browsers](#supported-platforms-browsers)
  7 | - [Supported Languages](#supported-languages)
  8 | - [Getting an AssemblyAI API Token](#getting-an-assemblyai-api-token)
  9 | - [Feedback/Support](#feedback-and-support)
 10 | 
 11 | # Getting Started
 12 | 
 13 | ### 1: Include AssemblyAI
 14 | 
 15 | ```html
 16 | <script src="https://cdn.jsdelivr.net/gh/assemblyai/assemblyai-algolia-voice-widget/public/assemblyai-voice-helper.js"></script>
 17 | ```
 18 | 
 19 | ### 2. Configure Algolia InstantSearch
 20 | 
 21 | > The below Voice Search Widget requires you have an AssemblyAI Token, which you can get [here](#getting-an-assemblyai-api-token)
 22 | 
 23 | ```js
 24 | const search = instantsearch({
 25 |     indexName: '...',
 26 |     searchClient: algoliasearch('...', '...'),
 27 | });
 28 | 
 29 | search.addWidgets([
 30 |     instantsearch.widgets.hits({
 31 |       container: '#hits',
 32 |     }),
 33 |     instantsearch.widgets.searchBox({
 34 |       container: '#searchbox'
 35 |     }),
 36 |     instantsearch.widgets.voiceSearch({
 37 |       container: '#voicesearch',
 38 |       createVoiceSearchHelper: window.assemblyAIHelper(
 39 |         'xxxxxxxxxxxxxxx', // Your AssemblyAI API Token
 40 |         {
 41 |           word_boost: ['AssemblyAI', 'Google', 'Facebook'], // AssemblyAI word_boost parameter. See: https://docs.assemblyai.com/all-guides/synchronous-transcription-for-short-audio-files#boost
 42 |           format_text: true // AssemblyAI format_text parameter. See: https://docs.assemblyai.com/all-guides/synchronous-transcription-for-short-audio-files#format
 43 |         }
 44 |       ),
 45 |       cssClasses: {
 46 |         root: ['AssemblyAIHelper'] // Add AssemblyAI stylings or use your own
 47 |       },
 48 |       templates: {
 49 |         status: ({errorCode}) => Boolean(errorCode) ? `<div>${errorCode}</div>` : '' // AssemblyAI error handling
 50 |       }
 51 |     }),
 52 |     // ... other configurations
 53 | ]);
 54 | 
 55 | search.start();
 56 | 
 57 | ```
 58 | 
 59 | # Supported Platforms Browsers
 60 | 
 61 | 
 62 | | Browser  | Supported |
 63 | | ------------- | ------------- |
 64 | | Dekstop Safari  | Yes  |
 65 | | Desktop Chrome  | Yes  |
 66 | | Desktop Firefox | Yes |
 67 | | iOS Safari | Yes |
 68 | | iOS Chrome | No |
 69 | | iOS Firefox | No |
 70 | | Android Chrome | Yes |
 71 | | Android Firefox | Yes |
 72 | 
 73 | # Supported Languages
 74 | 
 75 | At this time, only **English** (all accents) is supported.
 76 | 
 77 | # Getting an AssemblyAI API Token
 78 | 
 79 | AssemblyAI is a [Speech-to-Text API](https://www.assemblyai.com/) that can convert voice into text. You must have an AssemblyAI API Token to use this voice search widget. 
 80 | 
 81 | 1. Register for an AssemblyAI API token [here](https://app.assemblyai.com/login/)
 82 | 1. Add a credit card to your AssemblyAI account [here](https://app.assemblyai.com/dashboard/account/)
 83 | 1. Pricing is billed at **$0.008 per request to AssemblyAI**. 
 84 | 
 85 | # Feedback and Support
 86 | 
 87 | For questions about AssemblyAI, please email support@assemblyai.com. For questions about Algolia, please visit Algolia's support center [here](https://www.algolia.com/support/).
 88 | 
 89 | # Dev
 90 | 
 91 | ## Build
 92 | 
 93 | ```js
 94 | https://github.com/AssemblyAI/assemblyai-algolia-voice-widget
 95 | cd assemblyai-voice-widget
 96 | npm install
 97 | npm run build
 98 | ```
 99 | 
100 | ## Development
101 | ```js
102 | https://github.com/AssemblyAI/assemblyai-algolia-voice-widget
103 | cd assemblyai-voice-widget
104 | npm install
105 | npm run dev // Server is running with webpack-dev-server (http://localhost:3000)
106 | ```
107 | 


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/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "assemblyai-voice-widget",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "public/assemblyai-voice-widget.js",
 6 |   "scripts": {
 7 |     "dev": "webpack-dev-server",
 8 |     "build": "webpack --mode=production"
 9 |   },
10 |   "author": "Max Blank",
11 |   "license": "ISC",
12 |   "devDependencies": {
13 |     "@babel/core": "^7.8.6",
14 |     "@babel/preset-env": "^7.8.6",
15 |     "babel-loader": "^8.0.6",
16 |     "babel-polyfill": "^6.26.0",
17 |     "css-loader": "^3.4.2",
18 |     "expose-loader": "^0.7.5",
19 |     "node-sass": "^4.13.1",
20 |     "sass-loader": "^8.0.2",
21 |     "style-loader": "^1.1.3",
22 |     "webpack": "^4.41.6",
23 |     "webpack-cli": "^3.3.11",
24 |     "webpack-dev-server": "^3.10.3"
25 |   },
26 |   "dependencies": {
27 |     "audio-resampler": "^1.0.1"
28 |   }
29 | }
30 | 


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/public/assemblyai-voice-helper.js:
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e=n.buffer,r=new(window.AudioContext||window.webkitAudioContext),i=r.createBuffer(1,e[0].length,r.sampleRate);return i.getChannelData(0).set(e[0]),t.resample(i)})).then((function(n){console.log("audio",n);var e=t._createWaveFileData(n);return t._transcribe(btoa(t._uint8ToString(e)))})).then(n).catch((function(t){return console.log(t),n()}))}},{key:"on",value:function(t,n){switch(t){case"start":this.callbacks.start=n;break;case"stop":this.callbacks.stop=n;break;case"complete":this.callbacks.complete=n;break;case"error":this.callbacks.error=n;break;default:console.error("Event ".concat(t," does not exist."))}}},{key:"_transcribe",value:function(t){var n=this;return i("https://api.assemblyai.com/v2/stream/avs",{method:"POST",body:JSON.stringify(w({audio_data:t,sample_rate:this.PCM_DATA_SAMPLE_RATE},this.params)),headers:{authorization:this.token,"Content-Type":"application/json; charset=utf-8"}}).then((function(t){return t.json()})).then((function(t){if(!t.text)return n.callbacks.error({error:"No speech detected. Please try again"});n.callbacks.complete(t)})).catch((function(t){n.callbacks.error(t)}))}},{key:"resample",value:function(t){var n=this;return 44100===this.PCM_DATA_SAMPLE_RATE?Promise.resolve(t):new Promise((function(e){m()(t,n.PCM_DATA_SAMPLE_RATE,(function(t){var n=t.getAudioBuffer;e(n())}))}))}},{key:"_uint8ToString",value:function(t){return Array.prototype.map.call(t,(function(t){return String.fromCharCode(t)})).join("")}},{key:"_createWaveFileData",value:function(t){var n=t.length,e=t.numberOfChannels,r=t.sampleRate,i=r*e*16/8,o=16*e/8,u=n*e*2,a=new Uint8Array(44+u),c=u,s=28+(8+c);return this._writeString("RIFF",a,0),this._writeInt32(s,a,4),this._writeString("WAVE",a,8),this._writeString("fmt ",a,12),this._writeInt32(16,a,16),this._writeInt16(1,a,20),this._writeInt16(e,a,22),this._writeInt32(r,a,24),this._writeInt32(i,a,28),this._writeInt16(o,a,32),this._writeInt32(16,a,34),this._writeString("data",a,36),this._writeInt32(c,a,40),this._writeAudioBuffer(t,a,44),a}},{key:"_writeString",value:function(t,n,e){for(var r=0;r<t.length;++r)n[e+r]=t.charCodeAt(r)}},{key:"_writeInt16",value:function(t,n,e){t=Math.floor(t),n[e+0]=255&t,n[e+1]=t>>8&255}},{key:"_writeInt32",value:function(t,n,e){t=Math.floor(t),n[e+0]=255&t,n[e+1]=t>>8&255,n[e+2]=t>>16&255,n[e+3]=t>>24&255}},{key:"_writeAudioBuffer",value:function(t,n,e){for(var r=t.length,i=t.numberOfChannels,o=0;o<r;++o)for(var u=0;u<i;++u){var a=32768*t.getChannelData(u)[o];a<-32768&&(a=-32768),a>32767&&(a=32767),this._writeInt16(a,n,e),e+=2}}}])&&S(n.prototype,e),o&&S(n,o),t}();e(340);function O(t,n){var e=Object.keys(t);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(t);n&&(r=r.filter((function(n){return Object.getOwnPropertyDescriptor(t,n).enumerable}))),e.push.apply(e,r)}return e}function E(t){for(var n=1;n<arguments.length;n++){var e=null!=arguments[n]?arguments[n]:{};n%2?O(Object(e),!0).forEach((function(n){P(t,n,e[n])})):Object.getOwnPropertyDescriptors?Object.defineProperties(t,Object.getOwnPropertyDescriptors(e)):O(Object(e)).forEach((function(n){Object.defineProperty(t,n,Object.getOwnPropertyDescriptor(e,n))}))}return t}function P(t,n,e){return n in t?Object.defineProperty(t,n,{value:e,enumerable:!0,configurable:!0,writable:!0}):t[n]=e,t}e.d(n,"assemblyAIHelper",(function(){return M}));var M=function(t,n){return function(e){var r=e.searchAsYouSpeak,i=e.onQueryChange,o=e.onStateChange;r&&console.warn("the assemblyAI voice helper doesn't support searchAsYouSpeak");var u=function(t){return{status:t,transcript:"",isSpeechFinal:!1,errorCode:void 0}},a=u("initial"),c=new A(t,n);c.on("start",(function(){f({status:"recognizing"})})),c.on("error",(function(t){f({status:"error",errorCode:t.error||"Something went wrong"})})),c.on("stop",(function(){f({status:"finished"})})),c.on("complete",(function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},n=t.text;f({transcript:n}),i(n)}));var s=function(){return"askingPermission"===a.status||"recognizing"===a.status},f=function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};a=E({},a,{},t),document.querySelector(".AssemblyAIHelper")&&(s()?document.querySelector(".AssemblyAIHelper").classList.add("AssemblyAIHelper--listening"):document.querySelector(".AssemblyAIHelper").classList.remove("AssemblyAIHelper--listening")),o()},l=function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"initial";f(u(t))};return{getState:function(){return a},isBrowserSupported:function(){return Boolean(window.AudioContext||window.webkitAudioContext)&&Boolean(navigator.mediaDevices&&navigator.mediaDevices.getUserMedia)},isListening:s,startListening:function(){c&&(l("askingPermission"),c.start())},stopListening:function(){c.stop(),l("finished")},dispose:function(){c&&(c.stop(),c=void function(t){throw new Error('"'+t+'" is read-only')}("assembly"))}}}}}]).assemblyAIHelper;


--------------------------------------------------------------------------------
/public/index.html:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <meta name="viewport" content="width=device-width, initial-scale=1" />
 6 |     <link
 7 |       rel="stylesheet"
 8 |       href="https://cdn.jsdelivr.net/npm/instantsearch.css@7.1.0/themes/reset-min.css"
 9 |     />
10 |     <link
11 |       rel="stylesheet"
12 |       href="https://cdn.jsdelivr.net/npm/instantsearch.css@7.1.0/themes/algolia-min.css"
13 |     />
14 |     <title>AssemblyAI Voice Search</title>
15 | 
16 |     <style>
17 |       body {
18 |         padding: 0;
19 |         margin: 0;
20 |         background-color: #f1f1f1;
21 |         font-family: 'Open Sans', sans-serif;
22 |       }
23 | 
24 |       .container {
25 |         padding: 0 24px;
26 |       }
27 | 
28 |       #pagination {
29 |         margin-top: 1rem;
30 |       }
31 | 
32 |       #voicesearch{
33 |         margin-top: .75rem;
34 |       }
35 |     </style>
36 |   </head>
37 | 
38 |   <body>
39 |     <div class="container">
40 |       <h1>Algolia Voice Search</h1>
41 | 
42 |       <main>
43 |         <div id="searchbox"></div>
44 |         <div id="voicesearch"></div>
45 |         <div id="stats"></div>
46 |         <div id="hits"></div>
47 |         <div id="pagination"></div>
48 |       </main>
49 |     </div>
50 |   </body>
51 | 
52 |   <script src="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/js/all.min.js"></script>
53 |   <script src="https://cdn.jsdelivr.net/npm/algoliasearch@3.32.0/dist/algoliasearchLite.min.js"></script>
54 |   <script src="https://cdn.jsdelivr.net/npm/instantsearch.js@4.5.0/dist/instantsearch.production.min.js"></script>
55 | 
56 |   <script src="assemblyai-voice-helper.js"></script>
57 |   <script src="main.js" type="module"></script>
58 | </html>
59 | 


--------------------------------------------------------------------------------
/public/main.js:
--------------------------------------------------------------------------------
 1 | window.onload = () => {
 2 |   const search = instantsearch({
 3 |     indexName: 'movies',
 4 |     searchClient: algoliasearch('latency', 'algolia-api-token')
 5 |   });
 6 | 
 7 |   search.addWidgets([
 8 |     instantsearch.widgets.configure({
 9 |       hitsPerPage: 12
10 |     }),
11 |     instantsearch.widgets.hits({
12 |       container: '#hits',
13 |       templates: {
14 |         empty: 'No results',
15 |         item: `<span>{{{title}}} ({{{year}}})</span>`
16 |       }
17 |     }),
18 |     instantsearch.widgets.searchBox({
19 |       container: '#searchbox'
20 |     }),
21 |     instantsearch.widgets.voiceSearch({
22 |       container: '#voicesearch',
23 |       // TODO: this requires https://github.com/algolia/instantsearch.js/pull/4363
24 |       createVoiceSearchHelper: window.assemblyAIHelper(
25 |         'assemblyai-api-token'
26 |       ),
27 |       cssClasses: {
28 |         root: ['AssemblyAIHelper'] // Add AssemblyAI stylings or use your own
29 |       },
30 |       templates: {
31 |         status: ({errorCode}) => Boolean(errorCode) ? `<div>${errorCode}</div>` : ''
32 |       }
33 |     }),
34 |     instantsearch.widgets.pagination({
35 |       container: '#pagination'
36 |     }),
37 |     instantsearch.widgets.stats({
38 |       container: '#stats'
39 |     })
40 |   ]);
41 | 
42 |   search.start();
43 | };
44 | 


--------------------------------------------------------------------------------
/src/index.js:
--------------------------------------------------------------------------------
  1 | import 'babel-polyfill';
  2 | import AssemblyAI from './lib/assemblyai';
  3 | 
  4 | import './scss/main.scss';
  5 | 
  6 | export const assemblyAIHelper = (token, params) => ({
  7 |   // language,
  8 |   searchAsYouSpeak,
  9 |   onQueryChange,
 10 |   onStateChange
 11 | }) => {
 12 |   if (searchAsYouSpeak) {
 13 |     console.warn(
 14 |       "the assemblyAI voice helper doesn't support searchAsYouSpeak"
 15 |     );
 16 |   }
 17 | 
 18 |   const getDefaultState = status => ({
 19 |     status,
 20 |     transcript: '',
 21 |     isSpeechFinal: false,
 22 |     errorCode: undefined
 23 |   });
 24 |   let state = getDefaultState('initial');
 25 |   const assembly = new AssemblyAI(token, params);
 26 | 
 27 |   // TODO: can be done?
 28 |   // if (language) {
 29 |   //   assembly.lang = language;
 30 |   // }
 31 | 
 32 |   assembly.on('start', () => {
 33 |     setState({
 34 |       status: 'recognizing'
 35 |     });
 36 |   });
 37 | 
 38 |   assembly.on('error', event => {
 39 |     setState({
 40 |       status: 'error',
 41 |       errorCode: event.error || 'Something went wrong'
 42 |     });
 43 |   });
 44 | 
 45 |   assembly.on('stop', () => {
 46 |     setState({
 47 |       status: 'finished'
 48 |     });
 49 |   });
 50 | 
 51 |   assembly.on('complete', ({ text } = {}) => {
 52 |     setState({
 53 |       transcript: text
 54 |     });
 55 |     onQueryChange(text);
 56 |   });
 57 | 
 58 |   const isBrowserSupported = () =>
 59 |     Boolean(window.AudioContext || window.webkitAudioContext) &&
 60 |     Boolean(navigator.mediaDevices && navigator.mediaDevices.getUserMedia);
 61 | 
 62 |   const isListening = () =>
 63 |     state.status === 'askingPermission' || state.status === 'recognizing';
 64 | 
 65 |   const setState = (newState = {}) => {
 66 |     state = { ...state, ...newState };
 67 | 
 68 |     if (document.querySelector('.AssemblyAIHelper')) {
 69 |       if (isListening()) {
 70 |         document
 71 |           .querySelector('.AssemblyAIHelper')
 72 |           .classList.add('AssemblyAIHelper--listening');
 73 |       } else {
 74 |         document
 75 |           .querySelector('.AssemblyAIHelper')
 76 |           .classList.remove('AssemblyAIHelper--listening');
 77 |       }
 78 |     }
 79 | 
 80 |     onStateChange();
 81 |   };
 82 | 
 83 |   const resetState = (status = 'initial') => {
 84 |     setState(getDefaultState(status));
 85 |   };
 86 | 
 87 |   const getState = () => state;
 88 | 
 89 |   const startListening = () => {
 90 |     if (!assembly) {
 91 |       return;
 92 |     }
 93 | 
 94 |     resetState('askingPermission');
 95 | 
 96 |     assembly.start();
 97 |   };
 98 | 
 99 |   const dispose = () => {
100 |     if (!assembly) {
101 |       return;
102 |     }
103 |     assembly.stop();
104 | 
105 |     assembly = undefined;
106 |   };
107 | 
108 |   const stopListening = () => {
109 |     assembly.stop();
110 |     // Because `dispose` removes event listeners, `end` listener is not called.
111 |     // So we're setting the `status` as `finished` here.
112 |     // If we don't do it, it will be still `waiting` or `recognizing`.
113 |     resetState('finished');
114 |   };
115 | 
116 |   return {
117 |     getState,
118 |     isBrowserSupported,
119 |     isListening,
120 |     startListening,
121 |     stopListening,
122 |     dispose
123 |   };
124 | };
125 | 


--------------------------------------------------------------------------------
/src/lib/assemblyai.js:
--------------------------------------------------------------------------------
  1 | import VAD from './vad';
  2 | import { request } from './request';
  3 | import Recorder from './recorder';
  4 | import resampler from 'audio-resampler';
  5 | 
  6 | const API_ENDPOINT = 'https://api.assemblyai.com/v2/stream/avs';
  7 | 
  8 | export default class AssemblyAI {
  9 |   constructor(token, params = {}) {
 10 |     this.token = token;
 11 | 
 12 |     const browser = navigator && /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
 13 | 
 14 |     this.PCM_DATA_SAMPLE_RATE = browser ? 44100 : 16000;
 15 | 
 16 |     console.log(`Running on Safari: ${browser}`);
 17 | 
 18 |     // Default callbacks
 19 |     this.callbacks = {
 20 |       start: () => {},
 21 |       stop: () => {},
 22 |       complete: () => {},
 23 |       error: () => {}
 24 |     };
 25 | 
 26 |     const _params = {};
 27 | 
 28 |     if(params.word_boost){
 29 |       if(params.word_boost.length > 100){
 30 |         setTimeout(() => {
 31 |           this.callbacks.error({error: 'The word_boost parameter can be a max of 100 terms'});
 32 |         }, 4);
 33 |         return;
 34 |       }
 35 |       if(!params.word_boost.every(v => typeof v === 'string')){
 36 |         setTimeout(() => {
 37 |           this.callbacks.error({error: 'The word_boost parameter only accepts string terms'});
 38 |         }, 4);
 39 |         return;
 40 |       }
 41 |       _params['word_boost'] = params.word_boost;
 42 |     }
 43 | 
 44 |     if(params.format_text !== undefined){
 45 |       if(typeof params.format_text !== 'boolean'){
 46 |         setTimeout(() => {
 47 |           this.callbacks.error({error: 'The format_text parameter only accepts boolean values (true / false)'});
 48 |         }, 4);
 49 |         return;
 50 |       }
 51 | 
 52 |       _params['format_text'] = params.format_text;
 53 |     }
 54 | 
 55 |     this.params = _params;
 56 |   }
 57 | 
 58 |   /**
 59 |    * Function that starts the recording
 60 |    */
 61 |   start() {
 62 |     if (
 63 |       this.source &&
 64 |       this.source.context &&
 65 |       typeof this.source.context.resume === 'function'
 66 |     ) {
 67 |       this.source.context.resume();
 68 |     }
 69 | 
 70 |     return Promise.resolve()
 71 |       .then(() => {
 72 |         if (!this.recorder) {
 73 |           const audioContext = new (window.AudioContext ||
 74 |             window.webkitAudioContext)();
 75 | 
 76 |           let onaudioprocess;
 77 | 
 78 |           new VAD({
 79 |             context: audioContext,
 80 |             onaudioprocess: (func) => {
 81 |               onaudioprocess = func;
 82 |             },
 83 |             voice_stop: () => {
 84 |               if (this.isRecording) {
 85 |                 this.stop();
 86 |               }
 87 |             }
 88 |           });
 89 | 
 90 |           this.recorder = new Recorder(audioContext, {
 91 |             onAnalysed: ({data}) => onaudioprocess && onaudioprocess(data)
 92 |           });
 93 | 
 94 |           return navigator.mediaDevices
 95 |             .getUserMedia({
 96 |               audio: {
 97 |                 echoCancellation: false,
 98 |                 noiseSuppression: false,
 99 |                 autoGainControl: false,
100 |                 channelCount: 1
101 |               }
102 |             })
103 |             .then(stream => {
104 |               this.recorder.init(stream);
105 | 
106 |               this.recordingTimer = setTimeout(() => {
107 |                 console.log('AssemblyAI: Recording stopped because it has reached the limit of 15 seconds.');
108 |                 this.stop();
109 |               }, 15000);
110 |             })
111 |             .catch(err => {
112 |               this.callbacks.error(err);
113 |             });
114 |         }
115 |       })
116 |       .then(() => {
117 |         this.recorder.start().then(() => {
118 |           this.isRecording = true;
119 |           this.callbacks.start();
120 |         });
121 |       });
122 |   }
123 | 
124 |   /**
125 |    * Function that stops the recording
126 |    */
127 |   stop() {
128 |     this.isRecording = false;
129 |     this.callbacks.stop();
130 | 
131 |     if(this.recordingTimer){
132 |       clearTimeout(this.recordingTimer);
133 |     }
134 | 
135 |     const stopRecording = () => {
136 |       if (
137 |         this.source &&
138 |         this.source.mediaStream &&
139 |         typeof this.source.mediaStream.getTracks === 'function'
140 |       ) {
141 |         const tracks = this.source.mediaStream.getTracks();
142 |         // we need to make a new recorder for every time the user presses the button,
143 |         // otherwise we keep recording.
144 |         tracks.forEach(track => track.stop());
145 |         this.recorder = undefined;
146 |       }
147 |     };
148 | 
149 |     return Promise.resolve()
150 |       .then(() => {
151 |         if (this.recorder) {
152 |           return this.recorder.stop();
153 |         }
154 |         throw new Error('no recorder');
155 |       })
156 |       .then(({ buffer }) => {
157 |         const audioContext = new (window.AudioContext || window.webkitAudioContext)();
158 |         const newBuffer = audioContext.createBuffer( 1, buffer[0].length, audioContext.sampleRate );
159 |         newBuffer.getChannelData(0).set(buffer[0]);
160 | 
161 |         return this.resample(newBuffer);
162 |       })
163 |       .then((buffer) => {
164 |         console.log('audio', buffer);
165 |         const wav = this._createWaveFileData(buffer);
166 | 
167 |         return this._transcribe(btoa(this._uint8ToString(wav)));
168 |       })
169 |       .then(stopRecording)
170 |       .catch(e => {
171 |         console.log(e);
172 | 
173 |         return stopRecording();
174 |       });
175 |   }
176 | 
177 |   /**
178 |    * Function that registers event listeners.
179 |    * @param {string} event Event name. Valid options: start, stop, complete, error.
180 |    * @param {function} callback Function that will be called when event is fired.
181 |    */
182 |   on(event, callback) {
183 |     switch (event) {
184 |       case 'start': {
185 |         this.callbacks.start = callback;
186 |         break;
187 |       }
188 |       case 'stop': {
189 |         this.callbacks.stop = callback;
190 |         break;
191 |       }
192 |       case 'complete': {
193 |         this.callbacks.complete = callback;
194 |         break;
195 |       }
196 |       case 'error': {
197 |         this.callbacks.error = callback;
198 |         break;
199 |       }
200 |       default: {
201 |         console.error(`Event ${event} does not exist.`);
202 |       }
203 |     }
204 |   }
205 | 
206 |   /**
207 |    * Function that gets a transcript from AssemblyAI API.
208 |    * @param {base64} audio_data Audio recording.
209 |    */
210 |   _transcribe(audio_data) {
211 |     return request(API_ENDPOINT, {
212 |       method: 'POST',
213 |       body: JSON.stringify({ audio_data, sample_rate: this.PCM_DATA_SAMPLE_RATE, ...this.params}),
214 |       headers: {
215 |         authorization: this.token,
216 |         'Content-Type': 'application/json; charset=utf-8'
217 |       }
218 |     })
219 |       .then(res => res.json())
220 |       .then(data => {
221 |         if(!data.text){
222 |           return this.callbacks.error({error: 'No speech detected. Please try again'});
223 |         }
224 | 
225 |         this.callbacks.complete(data);
226 |       })
227 |       .catch((e) => {
228 |         this.callbacks.error(e);
229 |       });
230 |   }
231 | 
232 |   resample(buffer){
233 |     if(this.PCM_DATA_SAMPLE_RATE === 44100){
234 |       return Promise.resolve(buffer);
235 |     }
236 | 
237 |     return new Promise((resolve) => {
238 |       resampler(
239 |         buffer,
240 |         this.PCM_DATA_SAMPLE_RATE,
241 |         ({ getAudioBuffer }) => {
242 |           resolve(getAudioBuffer());
243 |         }
244 |       );
245 |     })
246 |   }
247 | 
248 |   _uint8ToString(buf) {
249 |     return Array.prototype.map.call(buf, i => String.fromCharCode(i)).join('');
250 |   }
251 | 
252 |   _createWaveFileData(audioBuffer) {
253 |     const frameLength = audioBuffer.length;
254 |     const numberOfChannels = audioBuffer.numberOfChannels;
255 |     const sampleRate = audioBuffer.sampleRate;
256 |     const bitsPerSample = 16;
257 |     const byteRate = (sampleRate * numberOfChannels * bitsPerSample) / 8;
258 |     const blockAlign = (numberOfChannels * bitsPerSample) / 8;
259 |     const wavDataByteLength = frameLength * numberOfChannels * 2; // 16-bit audio
260 |     const headerByteLength = 44;
261 |     const totalLength = headerByteLength + wavDataByteLength;
262 | 
263 |     const waveFileData = new Uint8Array(totalLength);
264 | 
265 |     const subChunk1Size = 16; // for linear PCM
266 |     const subChunk2Size = wavDataByteLength;
267 |     const chunkSize = 4 + (8 + subChunk1Size) + (8 + subChunk2Size);
268 | 
269 |     this._writeString('RIFF', waveFileData, 0);
270 |     this._writeInt32(chunkSize, waveFileData, 4);
271 |     this._writeString('WAVE', waveFileData, 8);
272 |     this._writeString('fmt ', waveFileData, 12);
273 | 
274 |     this._writeInt32(subChunk1Size, waveFileData, 16); // SubChunk1Size (4)
275 |     this._writeInt16(1, waveFileData, 20); // AudioFormat (2)
276 |     this._writeInt16(numberOfChannels, waveFileData, 22); // NumChannels (2)
277 |     this._writeInt32(sampleRate, waveFileData, 24); // SampleRate (4)
278 |     this._writeInt32(byteRate, waveFileData, 28); // ByteRate (4)
279 |     this._writeInt16(blockAlign, waveFileData, 32); // BlockAlign (2)
280 |     this._writeInt32(bitsPerSample, waveFileData, 34); // BitsPerSample (4)
281 | 
282 |     this._writeString('data', waveFileData, 36);
283 |     this._writeInt32(subChunk2Size, waveFileData, 40); // SubChunk2Size (4)
284 | 
285 |     // Write actual audio data starting at offset 44.
286 |     this._writeAudioBuffer(audioBuffer, waveFileData, 44);
287 | 
288 |     return waveFileData;
289 |   }
290 | 
291 |   _writeString(s, a, offset) {
292 |     for (let i = 0; i < s.length; ++i) {
293 |       a[offset + i] = s.charCodeAt(i);
294 |     }
295 |   }
296 | 
297 |   _writeInt16(n, a, offset) {
298 |     n = Math.floor(n);
299 | 
300 |     a[offset + 0] = n & 255;
301 |     a[offset + 1] = (n >> 8) & 255;
302 |   }
303 | 
304 |   _writeInt32(n, a, offset) {
305 |     n = Math.floor(n);
306 | 
307 |     a[offset + 0] = n & 255;
308 |     a[offset + 1] = (n >> 8) & 255;
309 |     a[offset + 2] = (n >> 16) & 255;
310 |     a[offset + 3] = (n >> 24) & 255;
311 |   }
312 | 
313 |   _writeAudioBuffer(audioBuffer, a, offset) {
314 |     let n = audioBuffer.length;
315 |     let channels = audioBuffer.numberOfChannels;
316 | 
317 |     for (let i = 0; i < n; ++i) {
318 |       for (let k = 0; k < channels; ++k) {
319 |         let buffer = audioBuffer.getChannelData(k);
320 |         let sample = buffer[i] * 32768.0;
321 | 
322 |         // Clip samples to the limitations of 16-bit.
323 |         // If we don't do this then we'll get nasty wrap-around distortion.
324 |         if (sample < -32768) sample = -32768;
325 |         if (sample > 32767) sample = 32767;
326 | 
327 |         this._writeInt16(sample, a, offset);
328 |         offset += 2;
329 |       }
330 |     }
331 |   }
332 | }


--------------------------------------------------------------------------------
/src/lib/microphone.js:
--------------------------------------------------------------------------------
  1 | /* eslint-disable */
  2 | /**
  3 |  * License (MIT)
  4 |  *
  5 |  * Copyright © 2013 Matt Diamond
  6 |  *
  7 |  * Permission is hereby granted, free of charge, to any person obtaining a
  8 |  * copy of this software and associated documentation files (the "Software"),
  9 |  * to deal in the Software without restriction, including without limitation
 10 |  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 11 |  * and/or sell copies of the Software, and to permit persons to whom the
 12 |  * Software is furnished to do so, subject to the following conditions:
 13 |  *
 14 |  * The above copyright notice and this permission notice shall be included
 15 |  * in all copies or substantial portions of the Software.
 16 |  *
 17 |  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 18 |  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 19 |  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 20 |  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 21 |  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 22 |  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 23 |  *
 24 |  */
 25 | import InlineWorker from 'inline-worker';
 26 | 
 27 | const defaultConfig = {
 28 |   bufferLen: 4096,
 29 |   numChannels: 2,
 30 |   mimeType: 'audio/wav',
 31 | };
 32 | 
 33 | class Microphone {
 34 |   constructor(source, config) {
 35 |     this.config = Object.assign({}, defaultConfig, config);
 36 | 
 37 |     this.recording = false;
 38 | 
 39 |     this.callbacks = {
 40 |       getBuffer: [],
 41 |       exportWAV: []
 42 |     };
 43 | 
 44 |     this.context = source.context;
 45 |     this.node = (this.context.createScriptProcessor ||
 46 |     this.context.createJavaScriptNode).call(this.context,
 47 |       this.config.bufferLen, this.config.numChannels, this.config.numChannels);
 48 | 
 49 |     this.node.onaudioprocess = (e) => {
 50 |       if (!this.recording) return;
 51 | 
 52 |       var buffer = [];
 53 |       for (var channel = 0; channel < this.config.numChannels; channel++) {
 54 |         buffer.push(e.inputBuffer.getChannelData(channel));
 55 |       }
 56 |       this.worker.postMessage({
 57 |         command: 'record',
 58 |         buffer: buffer
 59 |       });
 60 |     };
 61 | 
 62 |     source.connect(this.node);
 63 |     this.node.connect(this.context.destination);    //this should not be necessary
 64 | 
 65 |     let self = {};
 66 |     this.worker = new InlineWorker(function () {
 67 |       let recLength = 0,
 68 |         recBuffers = [],
 69 |         sampleRate,
 70 |         numChannels;
 71 | 
 72 |       this.onmessage = function (e) {
 73 |         switch (e.data.command) {
 74 |           case 'init':
 75 |             init(e.data.config);
 76 |             break;
 77 |           case 'record':
 78 |             record(e.data.buffer);
 79 |             break;
 80 |           case 'exportWAV':
 81 |             exportWAV(e.data.type);
 82 |             break;
 83 |           case 'getBuffer':
 84 |             getBuffer();
 85 |             break;
 86 |           case 'clear':
 87 |             clear();
 88 |             break;
 89 |         }
 90 |       };
 91 | 
 92 |       function init(config) {
 93 |         sampleRate = config.sampleRate;
 94 |         numChannels = config.numChannels;
 95 |         initBuffers();
 96 |       }
 97 | 
 98 |       function record(inputBuffer) {
 99 |         for (var channel = 0; channel < numChannels; channel++) {
100 |           recBuffers[channel].push(inputBuffer[channel]);
101 |         }
102 |         recLength += inputBuffer[0].length;
103 |       }
104 | 
105 |       function exportWAV(type) {
106 |         let buffers = [];
107 |         for (let channel = 0; channel < numChannels; channel++) {
108 |           buffers.push(mergeBuffers(recBuffers[channel], recLength));
109 |         }
110 |         let interleaved;
111 |         if (numChannels === 2) {
112 |           interleaved = interleave(buffers[0], buffers[1]);
113 |         } else {
114 |           interleaved = buffers[0];
115 |         }
116 |         let dataview = encodeWAV(interleaved);
117 |         let audioBlob = new Blob([dataview], {type: type});
118 | 
119 |         this.postMessage({command: 'exportWAV', data: audioBlob});
120 |       }
121 | 
122 |       function getBuffer() {
123 |         let buffers = [];
124 |         for (let channel = 0; channel < numChannels; channel++) {
125 |           buffers.push(mergeBuffers(recBuffers[channel], recLength));
126 |         }
127 |         this.postMessage({command: 'getBuffer', data: buffers});
128 |       }
129 | 
130 |       function clear() {
131 |         recLength = 0;
132 |         recBuffers = [];
133 |         initBuffers();
134 |       }
135 | 
136 |       function initBuffers() {
137 |         for (let channel = 0; channel < numChannels; channel++) {
138 |           recBuffers[channel] = [];
139 |         }
140 |       }
141 | 
142 |       function mergeBuffers(recBuffers, recLength) {
143 |         let result = new Float32Array(recLength);
144 |         let offset = 0;
145 |         for (let i = 0; i < recBuffers.length; i++) {
146 |           result.set(recBuffers[i], offset);
147 |           offset += recBuffers[i].length;
148 |         }
149 |         return result;
150 |       }
151 | 
152 |       function interleave(inputL, inputR) {
153 |         let length = inputL.length + inputR.length;
154 |         let result = new Float32Array(length);
155 | 
156 |         let index = 0,
157 |           inputIndex = 0;
158 | 
159 |         while (index < length) {
160 |           result[index++] = inputL[inputIndex];
161 |           result[index++] = inputR[inputIndex];
162 |           inputIndex++;
163 |         }
164 |         return result;
165 |       }
166 | 
167 |       function floatTo16BitPCM(output, offset, input) {
168 |         for (let i = 0; i < input.length; i++, offset += 2) {
169 |           let s = Math.max(-1, Math.min(1, input[i]));
170 |           output.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
171 |         }
172 |       }
173 | 
174 |       function writeString(view, offset, string) {
175 |         for (let i = 0; i < string.length; i += 1) {
176 |           view.setUint8(offset + i, string.charCodeAt(i));
177 |         }
178 |       }
179 | 
180 |       function encodeWAV(samples) {
181 |         const buffer = new ArrayBuffer(44 + (samples.length * 2));
182 |         const view = new DataView(buffer);
183 | 
184 |         /* RIFF identifier */
185 |         writeString(view, 0, 'RIFF');
186 |         /* RIFF chunk length */
187 |         view.setUint32(4, 36 + (samples.length * 2), true);
188 |         /* RIFF type */
189 |         writeString(view, 8, 'WAVE');
190 |         /* format chunk identifier */
191 |         writeString(view, 12, 'fmt ');
192 |         /* format chunk length */
193 |         view.setUint32(16, 16, true);
194 |         /* sample format (raw) */
195 |         view.setUint16(20, 1, true);
196 |         /* channel count */
197 |         view.setUint16(22, numChannels, true);
198 |         /* sample rate */
199 |         view.setUint32(24, sampleRate, true);
200 |         /* byte rate (sample rate * block align) */
201 |         view.setUint32(28, sampleRate * 4, true);
202 |         /* block align (channel count * bytes per sample) */
203 |         view.setUint16(32, numChannels * 2, true);
204 |         /* bits per sample */
205 |         view.setUint16(34, 16, true);
206 |         /* data chunk identifier */
207 |         writeString(view, 36, 'data');
208 |         /* data chunk length */
209 |         view.setUint32(40, samples.length * 2, true);
210 | 
211 |         floatTo16BitPCM(view, 44, samples);
212 | 
213 |         return view;
214 |       }
215 |     }, self);
216 | 
217 |     this.worker.postMessage({
218 |       command: 'init',
219 |       config: {
220 |         sampleRate: this.context.sampleRate,
221 |         numChannels: this.config.numChannels,
222 |       },
223 |     });
224 | 
225 |     this.worker.onmessage = (e) => {
226 |       const cb = this.callbacks[e.data.command].pop();
227 |       if (typeof cb === 'function') {
228 |         cb(e.data.data);
229 |       }
230 |     };
231 |   }
232 | 
233 | 
234 |   record() {
235 |     this.recording = true;
236 |   }
237 | 
238 |   stop() {
239 |     this.recording = false;
240 |   }
241 | 
242 |   clear() {
243 |     this.worker.postMessage({command: 'clear'});
244 |   }
245 | 
246 |   getBuffer(cb) {
247 |     cb = cb || this.config.callback;
248 | 
249 |     if (!cb) throw new Error('Callback not set');
250 | 
251 |     this.callbacks.getBuffer.push(cb);
252 | 
253 |     this.worker.postMessage({command: 'getBuffer'});
254 |   }
255 | 
256 |   exportWAV(cb, mimeType) {
257 |     mimeType = mimeType || this.config.mimeType;
258 |     cb = cb || this.config.callback;
259 | 
260 |     if (!cb) throw new Error('Callback not set');
261 | 
262 |     this.callbacks.exportWAV.push(cb);
263 | 
264 |     this.worker.postMessage({
265 |       command: 'exportWAV',
266 |       type: mimeType,
267 |     });
268 |   }
269 | }
270 | 
271 | Microphone.forceDownload = function forceDownload(blob, filename) {
272 |     const a = document.createElement('a');
273 | 
274 |     a.style = 'display: none';
275 |     document.body.appendChild(a);
276 | 
277 |     var url = window.URL.createObjectURL(blob);
278 | 
279 |     a.href = url;
280 |     a.download = filename;
281 |     a.click();
282 | 
283 |     window.URL.revokeObjectURL(url);
284 | 
285 |     document.body.removeChild(a);
286 | };
287 | 
288 | export default Microphone;


--------------------------------------------------------------------------------
/src/lib/recorder.js:
--------------------------------------------------------------------------------
  1 | import Microphone from './microphone';
  2 | 
  3 | const defaultConfig = {
  4 |   nFrequencyBars: 255,
  5 |   onAnalysed: null,
  6 | };
  7 | 
  8 | const microphoneConfigOptions = ['bufferLen', 'numChannels', 'mimeType'];
  9 | 
 10 | class Recorder {
 11 |   constructor(audioContext, config = {}) {
 12 |     this.config = Object.assign({}, defaultConfig, config);
 13 | 
 14 |     this.audioContext = audioContext;
 15 |     this.audioInput = null;
 16 |     this.realAudioInput = null;
 17 |     this.inputPoint = null;
 18 |     this.audioRecorder = null;
 19 |     this.rafID = null;
 20 |     this.analyserContext = null;
 21 |     this.recIndex = 0;
 22 |     this.stream = null;
 23 | 
 24 |     this.microphoneConfig = microphoneConfigOptions.reduce((a, c) => {
 25 |       if (config[c]) {
 26 |         a[c] = config[c];
 27 |       }
 28 |       return a;
 29 |     }, {});
 30 | 
 31 |     this.updateAnalysers = this.updateAnalysers.bind(this);
 32 |   }
 33 | 
 34 |   init(stream) {
 35 |     return new Promise((resolve) => {
 36 |       this.inputPoint = this.audioContext.createGain();
 37 | 
 38 |       this.stream = stream;
 39 | 
 40 |       this.realAudioInput = this.audioContext.createMediaStreamSource(stream);
 41 |       this.audioInput = this.realAudioInput;
 42 |       this.audioInput.connect(this.inputPoint);
 43 | 
 44 |       this.analyserNode = this.audioContext.createAnalyser();
 45 |       this.analyserNode.fftSize = 512;
 46 |       this.analyserNode.smoothingTimeConstant = 0.99;
 47 |       this.inputPoint.connect(this.analyserNode);
 48 | 
 49 |       this.audioRecorder = new Microphone(this.inputPoint, this.microphoneConfig);
 50 | 
 51 |       const zeroGain = this.audioContext.createGain();
 52 |       zeroGain.gain.value = 0.0;
 53 | 
 54 |       this.inputPoint.connect(zeroGain);
 55 |       zeroGain.connect(this.audioContext.destination);
 56 | 
 57 |       this.updateAnalysers();
 58 | 
 59 |       resolve();
 60 |     });
 61 |   }
 62 | 
 63 |   start() {
 64 |     return new Promise((resolve, reject) => {
 65 |       if (!this.audioRecorder) {
 66 |         reject('Not currently recording');
 67 |         return;
 68 |       }
 69 | 
 70 |       this.audioRecorder.clear();
 71 |       this.audioRecorder.record();
 72 | 
 73 |       resolve(this.stream);
 74 |     });
 75 |   }
 76 | 
 77 |   stop() {
 78 |     return new Promise((resolve) => {
 79 |       this.audioRecorder.stop();
 80 | 
 81 |       this.audioRecorder.getBuffer((buffer) => {
 82 |         this.audioRecorder.exportWAV(blob => resolve({buffer, blob}));
 83 |       });
 84 |     });
 85 |   }
 86 | 
 87 |   updateAnalysers() {
 88 |     if (this.config.onAnalysed) {
 89 |       requestAnimationFrame(this.updateAnalysers);
 90 | 
 91 |       const freqByteData = new Uint8Array(this.analyserNode.frequencyBinCount);
 92 | 
 93 |       this.analyserNode.getByteFrequencyData(freqByteData);
 94 | 
 95 |       const data = new Array(255);
 96 |       let lastNonZero = 0;
 97 |       let datum;
 98 | 
 99 |       for (let idx = 0; idx < 255; idx += 1) {
100 |         datum = Math.floor(freqByteData[idx]) - (Math.floor(freqByteData[idx]) % 5);
101 | 
102 |         if (datum !== 0) {
103 |           lastNonZero = idx;
104 |         }
105 | 
106 |         data[idx] = datum;
107 |       }
108 | 
109 |       this.config.onAnalysed({data, lineTo: lastNonZero});
110 |     }
111 |   }
112 | 
113 |   setOnAnalysed(handler) {
114 |     this.config.onAnalysed = handler;
115 |   }
116 | }
117 | 
118 | Recorder.download = function download(blob, filename = 'audio') {
119 |   Microphone.forceDownload(blob, `${filename}.wav`);
120 | };
121 | 
122 | export default Recorder;


--------------------------------------------------------------------------------
/src/lib/request.js:
--------------------------------------------------------------------------------
 1 | // orig. developit/unfetch
 2 | export function request(url, options) {
 3 |   options = options || {};
 4 |   return new Promise((resolve, reject) => {
 5 |     const request = new XMLHttpRequest();
 6 | 
 7 |     const keys = [];
 8 |     const all = [];
 9 |     const headers = {};
10 | 
11 |     const response = () => ({
12 |       ok: ((request.status / 100) | 0) == 2, // 200-299
13 |       statusText: request.statusText,
14 |       status: request.status,
15 |       url: request.responseURL,
16 |       text: () => Promise.resolve(request.responseText),
17 |       json: () => Promise.resolve(request.responseText).then(JSON.parse),
18 |       blob: () => Promise.resolve(new Blob([request.response])),
19 |       clone: response,
20 |       headers: {
21 |         keys: () => keys,
22 |         entries: () => all,
23 |         get: n => headers[n.toLowerCase()],
24 |         has: n => n.toLowerCase() in headers
25 |       }
26 |     });
27 | 
28 |     request.open(options.method || 'get', url, true);
29 | 
30 |     request.onload = () => {
31 |       request
32 |         .getAllResponseHeaders()
33 |         .replace(/^(.*?):[^\S\n]*([\s\S]*?)$/gm, (m, key, value) => {
34 |           keys.push((key = key.toLowerCase()));
35 |           all.push([key, value]);
36 |           headers[key] = headers[key] ? `${headers[key]},${value}` : value;
37 |         });
38 |         const res = response();
39 | 
40 |         if(!res.ok){
41 |           return reject(JSON.parse(request.responseText));
42 |         }
43 | 
44 |       resolve(res);
45 |     };
46 | 
47 |     request.onerror = reject;
48 | 
49 |     request.withCredentials = options.credentials == 'include';
50 | 
51 |     for (const i in options.headers) {
52 |       request.setRequestHeader(i, options.headers[i]);
53 |     }
54 | 
55 |     request.send(options.body || null);
56 |   });
57 | }
58 | 


--------------------------------------------------------------------------------
/src/lib/vad.js:
--------------------------------------------------------------------------------
  1 | export default function VAD(options) {
  2 |   // Default options
  3 |   this.options = {
  4 |     fftSize: 512,
  5 |     bufferLen: 512,
  6 |     voice_stop: function() {},
  7 |     voice_start: function() {},
  8 |     smoothingTimeConstant: 0.99,
  9 |     energy_offset: 1e-8, // The initial offset.
 10 |     energy_threshold_ratio_pos: 2, // Signal must be twice the offset
 11 |     energy_threshold_ratio_neg: 0.5, // Signal must be half the offset
 12 |     energy_integration: 1, // Size of integration change compared to the signal per second.
 13 |     filter: [
 14 |       { f: 200, v: 0 }, // 0 -> 200 is 0
 15 |       { f: 2000, v: 1 } // 200 -> 2k is 1
 16 |     ],
 17 |     source: null,
 18 |     context: null
 19 |   };
 20 | 
 21 |   // User options
 22 |   for (var option in options) {
 23 |     if (options.hasOwnProperty(option)) {
 24 |       this.options[option] = options[option];
 25 |     }
 26 |   }
 27 | 
 28 |   // Calculate time relationships
 29 |   this.hertzPerBin = this.options.context.sampleRate / this.options.fftSize;
 30 |   this.iterationFrequency =
 31 |     this.options.context.sampleRate / this.options.bufferLen;
 32 |   this.iterationPeriod = 1 / this.iterationFrequency;
 33 | 
 34 |   var DEBUG = true;
 35 |   if (DEBUG)
 36 |     console.log(
 37 |       'Vad' +
 38 |         ' | sampleRate: ' +
 39 |         this.options.context.sampleRate +
 40 |         ' | hertzPerBin: ' +
 41 |         this.hertzPerBin +
 42 |         ' | iterationFrequency: ' +
 43 |         this.iterationFrequency +
 44 |         ' | iterationPeriod: ' +
 45 |         this.iterationPeriod
 46 |     );
 47 | 
 48 |   this.setFilter = function(shape) {
 49 |     this.filter = [];
 50 |     for (var i = 0, iLen = this.options.fftSize / 2; i < iLen; i++) {
 51 |       this.filter[i] = 0;
 52 |       for (var j = 0, jLen = shape.length; j < jLen; j++) {
 53 |         if (i * this.hertzPerBin < shape[j].f) {
 54 |           this.filter[i] = shape[j].v;
 55 |           break; // Exit j loop
 56 |         }
 57 |       }
 58 |     }
 59 |   };
 60 | 
 61 |   this.setFilter(this.options.filter);
 62 | 
 63 |   this.ready = {};
 64 |   this.vadState = false; // True when Voice Activity Detected
 65 | 
 66 |   // Energy detector props
 67 |   this.energy_offset = this.options.energy_offset;
 68 |   this.energy_threshold_pos =
 69 |     this.energy_offset * this.options.energy_threshold_ratio_pos;
 70 |   this.energy_threshold_neg =
 71 |     this.energy_offset * this.options.energy_threshold_ratio_neg;
 72 | 
 73 |   this.voiceTrend = 0;
 74 |   this.voiceTrendMax = 10;
 75 |   this.voiceTrendMin = -10;
 76 |   this.voiceTrendStart = 5;
 77 |   this.voiceTrendEnd = -5;
 78 | 
 79 |   this.floatFrequencyData = new Float32Array(255);
 80 | 
 81 |   // Setup local storage of the Linear FFT data
 82 |   this.floatFrequencyDataLinear = new Float32Array(255);
 83 | 
 84 |   // Create callback to update/analyze floatFrequencyData
 85 |   options.onaudioprocess((data) => {
 86 |     this.floatFrequencyData = data;
 87 |     this.update();
 88 |     this.monitor();
 89 |   })
 90 | 
 91 |   // log stuff
 92 |   this.logging = false;
 93 |   this.log_i = 0;
 94 |   this.log_limit = 100;
 95 | 
 96 |   this.triggerLog = function(limit) {
 97 |     this.logging = true;
 98 |     this.log_i = 0;
 99 |     this.log_limit = typeof limit === 'number' ? limit : this.log_limit;
100 |   };
101 | 
102 |   this.log = function(msg) {
103 |     if (this.logging && this.log_i < this.log_limit) {
104 |       this.log_i++;
105 |       console.log(msg);
106 |     } else {
107 |       this.logging = false;
108 |     }
109 |   };
110 | 
111 |   this.update = function() {
112 |     // Update the local version of the Linear FFT
113 |     var fft = this.floatFrequencyData;
114 |     for (var i = 0, iLen = fft.length; i < iLen; i++) {
115 |       this.floatFrequencyDataLinear[i] = Math.pow(10, fft[i] / 10);
116 |     }
117 |     this.ready = {};
118 |   };
119 | 
120 |   this.getEnergy = function() {
121 |     if (this.ready.energy) {
122 |       return this.energy;
123 |     }
124 | 
125 |     var energy = 0;
126 |     var fft = this.floatFrequencyDataLinear;
127 | 
128 |     for (var i = 0, iLen = fft.length; i < iLen; i++) {
129 |       energy += this.filter[i] * fft[i] * fft[i];
130 |     }
131 | 
132 |     this.energy = energy;
133 |     this.ready.energy = true;
134 | 
135 |     return energy;
136 |   };
137 | 
138 |   this.monitor = function() {
139 |     var energy = this.getEnergy();
140 |     var signal = energy - this.energy_offset;
141 | 
142 |     if (signal > this.energy_threshold_pos) {
143 |       this.voiceTrend =
144 |         this.voiceTrend + 1 > this.voiceTrendMax
145 |           ? this.voiceTrendMax
146 |           : this.voiceTrend + 1;
147 |     } else if (signal < -this.energy_threshold_neg) {
148 |       this.voiceTrend =
149 |         this.voiceTrend - 1 < this.voiceTrendMin
150 |           ? this.voiceTrendMin
151 |           : this.voiceTrend - 1;
152 |     } else {
153 |       // voiceTrend gets smaller
154 |       if (this.voiceTrend > 0) {
155 |         this.voiceTrend--;
156 |       } else if (this.voiceTrend < 0) {
157 |         this.voiceTrend++;
158 |       }
159 |     }
160 | 
161 |     var start = false,
162 |       end = false;
163 |     if (this.voiceTrend > this.voiceTrendStart) {
164 |       // Start of speech detected
165 |       start = true;
166 |     } else if (this.voiceTrend < this.voiceTrendEnd) {
167 |       // End of speech detected
168 |       end = true;
169 |     }
170 | 
171 |     // Integration brings in the real-time aspect through the relationship with the frequency this functions is called.
172 |     var integration =
173 |       signal * this.iterationPeriod * this.options.energy_integration;
174 | 
175 |     // Idea?: The integration is affected by the voiceTrend magnitude? - Not sure. Not doing atm.
176 | 
177 |     // The !end limits the offset delta boost till after the end is detected.
178 |     if (integration > 0 || !end) {
179 |       this.energy_offset += integration;
180 |     } else {
181 |       this.energy_offset += integration * 10;
182 |     }
183 |     this.energy_offset = this.energy_offset < 0 ? 0 : this.energy_offset;
184 |     this.energy_threshold_pos =
185 |       this.energy_offset * this.options.energy_threshold_ratio_pos;
186 |     this.energy_threshold_neg =
187 |       this.energy_offset * this.options.energy_threshold_ratio_neg;
188 | 
189 |     // Broadcast the messages
190 |     if (start && !this.vadState) {
191 |       this.vadState = true;
192 |       this.options.voice_start();
193 |     }
194 |     if (end && this.vadState) {
195 |       this.vadState = false;
196 |       this.options.voice_stop();
197 |     }
198 | 
199 |     this.log(
200 |       'e: ' +
201 |         energy +
202 |         ' | e_of: ' +
203 |         this.energy_offset +
204 |         ' | e+_th: ' +
205 |         this.energy_threshold_pos +
206 |         ' | e-_th: ' +
207 |         this.energy_threshold_neg +
208 |         ' | signal: ' +
209 |         signal +
210 |         ' | int: ' +
211 |         integration +
212 |         ' | voiceTrend: ' +
213 |         this.voiceTrend +
214 |         ' | start: ' +
215 |         start +
216 |         ' | end: ' +
217 |         end
218 |     );
219 | 
220 |     return signal;
221 |   };
222 | }
223 | 


--------------------------------------------------------------------------------
/src/scss/main.scss:
--------------------------------------------------------------------------------
 1 | .AssemblyAIHelper{
 2 |     .ais-VoiceSearch{
 3 |         &-button{
 4 |             width: 140px;
 5 |             display: inline-block;
 6 |             font-weight: 400;
 7 |             background-color: #3392FE;
 8 |             color: white;
 9 |             text-align: center;
10 |             white-space: nowrap;
11 |             vertical-align: middle;
12 |             -webkit-user-select: none;
13 |             -moz-user-select: none;
14 |             -ms-user-select: none;
15 |             user-select: none;
16 |             border: 1px solid transparent;
17 |             padding: .375rem .75rem;
18 |             font-size: 1rem;
19 |             line-height: 1.5;
20 |             border-radius: .25rem;
21 |             transition: background-color .15s ease-in-out;
22 |             cursor: pointer;
23 | 
24 |             &:active, &:focus, &:hover{
25 |                 outline: none;
26 |                 background-color: #2E80DC;
27 |             }
28 |         }
29 | 
30 |         &-status > div{
31 |             padding: .75rem 1.25rem;
32 |             margin: 1rem 0;
33 |             border: 1px solid #f5c6cb;
34 |             border-radius: .25rem;
35 |             background-color: #f8d7da;
36 |             color: #721c24;
37 |         }
38 |     }
39 | 
40 |     &--listening{
41 |         .ais-VoiceSearch-button{
42 |             background-color: #E74C3C;
43 | 
44 |             animation: assemblyaihelper-pulse 1s infinite;
45 | 
46 |             &:hover, &:active, &:focus{
47 |                 background-color: #E74C3C;
48 |             }
49 |         }
50 |     }
51 | }
52 | 
53 | @keyframes assemblyaihelper-pulse{
54 |     0% {
55 |         box-shadow: 0 0 0 0px rgba(0, 0, 0, 0.2);
56 |     }
57 |     100% {
58 |         box-shadow: 0 0 0 10px rgba(0, 0, 0, 0);
59 |     }
60 | }


--------------------------------------------------------------------------------
/webpack.config.js:
--------------------------------------------------------------------------------
 1 | const path = require('path');
 2 | 
 3 | module.exports = {
 4 |   mode: 'development',
 5 |   entry: './src/index.js',
 6 |   output: {
 7 |     path: path.resolve(__dirname, 'public'),
 8 |     filename: 'assemblyai-voice-helper.js',
 9 |     library: 'assemblyAIHelper',
10 |     libraryTarget: 'var',
11 |     libraryExport: 'assemblyAIHelper'
12 |   },
13 |   module: {
14 |     rules: [
15 |       {
16 |         test: /\.(s*)css$/,
17 |         use: ['style-loader', 'css-loader', 'sass-loader']
18 |       },
19 |       {
20 |         test: /\.m?js$/,
21 |         exclude: /(node_modules|bower_components)/,
22 |         use: [
23 |           {
24 |             loader: 'babel-loader',
25 |             options: {
26 |               presets: ['@babel/preset-env']
27 |             }
28 |           }
29 |         ]
30 |       }
31 |     ]
32 |   },
33 |   devServer: {
34 |     contentBase: path.join(__dirname, 'public'),
35 |     compress: true,
36 |     port: 3000
37 |   }
38 | };
39 | 


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