2022-11-25 21:57:46 +00:00
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<!doctype html>
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<html lang="en-us">
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<head>
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<title>stream : Real-time Whisper transcription in WebAssembly</title>
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<style>
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#output {
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width: 100%;
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height: 100%;
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margin: 0 auto;
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margin-top: 10px;
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border-left: 0px;
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border-right: 0px;
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padding-left: 0px;
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padding-right: 0px;
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display: block;
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background-color: black;
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color: white;
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font-size: 10px;
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font-family: 'Lucida Console', Monaco, monospace;
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outline: none;
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white-space: pre;
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overflow-wrap: normal;
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overflow-x: scroll;
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}
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</style>
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</head>
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<body>
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<div id="main-container">
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<b>stream : Real-time Whisper transcription in WebAssembly</b>
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<br><br>
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You can find more about this project on <a href="https://github.com/ggerganov/whisper.cpp/tree/master/examples/stream.wasm">GitHub</a>.
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<br><br>
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<hr>
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Select the model you would like to use, click the "Start" button and start speaking
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<br><br>
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<div id="model-whisper">
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Whisper model: <span id="model-whisper-status"></span>
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<button id="fetch-whisper-tiny-en" onclick="loadWhisper('tiny.en')">tiny.en (75 MB)</button>
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<button id="fetch-whisper-base-en" onclick="loadWhisper('base.en')">base.en (142 MB)</button>
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<span id="fetch-whisper-progress"></span>
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<!--
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<input type="file" id="file" name="file" onchange="loadFile(event, 'whisper.bin')" />
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-->
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</div>
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<br>
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<div id="input">
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<button id="start" onclick="onStart()" disabled>Start</button>
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<button id="stop" onclick="onStop()" disabled>Stop</button>
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<button id="clear" onclick="clearCache()">Clear Cache</button>
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</div>
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<br>
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<div id="state">
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Status: <b><span id="state-status">not started</span></b>
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<pre id="state-transcribed">[The transcribed text will be displayed here]</pre>
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</div>
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<hr>
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Debug output:
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<textarea id="output" rows="20"></textarea>
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<br>
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<b>Troubleshooting</b>
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<br><br>
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The page does some heavy computations, so make sure:
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<ul>
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<li>To use a modern web browser (e.g. Chrome, Firefox)</li>
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<li>To use a fast desktop or laptop computer (i.e. not a mobile phone)</li>
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<li>Your browser supports WASM <a href="https://webassembly.org/roadmap/">Fixed-width SIMD</a></li>
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</ul>
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<div class="cell-version">
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<span>
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Build time: <span class="nav-link">@GIT_DATE@</span> |
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Commit hash: <a class="nav-link" href="https://github.com/ggerganov/whisper.cpp/commit/@GIT_SHA1@">@GIT_SHA1@</a> |
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Commit subject: <span class="nav-link">@GIT_COMMIT_SUBJECT@</span> |
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<a class="nav-link" href="https://github.com/ggerganov/whisper.cpp/tree/master/examples/stream.wasm">Source Code</a> |
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</span>
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</div>
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</div>
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<script type="text/javascript" src="helpers.js"></script>
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<script type='text/javascript'>
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// web audio context
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var context = null;
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// audio data
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var audio = null;
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var audio0 = null;
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// the stream instance
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var instance = null;
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// model name
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var model_whisper = null;
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var Module = {
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print: printTextarea,
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printErr: printTextarea,
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setStatus: function(text) {
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printTextarea('js: ' + text);
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},
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monitorRunDependencies: function(left) {
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},
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preRun: function() {
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printTextarea('js: Preparing ...');
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},
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postRun: function() {
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printTextarea('js: Initialized successfully!');
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}
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};
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//
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// fetch models
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//
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let dbVersion = 1
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let dbName = 'whisper.ggerganov.com';
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let indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB
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function storeFS(fname, buf) {
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// write to WASM file using FS_createDataFile
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// if the file exists, delete it
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try {
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Module.FS_unlink(fname);
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} catch (e) {
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// ignore
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}
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Module.FS_createDataFile("/", fname, buf, true, true);
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printTextarea('storeFS: stored model: ' + fname + ' size: ' + buf.length);
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document.getElementById('model-whisper-status').innerHTML = 'loaded "' + model_whisper + '"!';
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if (model_whisper != null) {
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document.getElementById('start').disabled = false;
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document.getElementById('stop' ).disabled = true;
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}
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}
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function loadWhisper(model) {
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let urls = {
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'tiny.en': 'https://whisper.ggerganov.com/ggml-model-whisper-tiny.en.bin',
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'base.en': 'https://whisper.ggerganov.com/ggml-model-whisper-base.en.bin',
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};
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let sizes = {
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'tiny.en': 75,
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'base.en': 142,
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};
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let url = urls[model];
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let dst = 'whisper.bin';
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let size_mb = sizes[model];
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model_whisper = model;
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document.getElementById('fetch-whisper-tiny-en').style.display = 'none';
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document.getElementById('fetch-whisper-base-en').style.display = 'none';
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document.getElementById('model-whisper-status').innerHTML = 'loading "' + model + '" ... ';
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cbProgress = function(p) {
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let el = document.getElementById('fetch-whisper-progress');
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el.innerHTML = Math.round(100*p) + '%';
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};
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cbCancel = function() {
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var el;
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el = document.getElementById('fetch-whisper-tiny-en'); if (el) el.style.display = 'inline-block';
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el = document.getElementById('fetch-whisper-base-en'); if (el) el.style.display = 'inline-block';
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el = document.getElementById('model-whisper-status'); if (el) el.innerHTML = '';
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};
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loadRemote(url, dst, size_mb, cbProgress, storeFS, cbCancel, printTextarea);
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}
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//
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// microphone
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//
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2022-11-26 09:40:06 +00:00
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const kSampleRate = 16000;
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const kRestartRecording_s = 120;
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const kIntervalAudio_ms = 5000; // pass the recorded audio to the C++ instance at this rate
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2022-11-25 21:57:46 +00:00
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var mediaRecorder = null;
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var doRecording = false;
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var startTime = 0;
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2022-11-26 09:40:06 +00:00
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window.AudioContext = window.AudioContext || window.webkitAudioContext;
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window.OfflineAudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
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2022-11-25 21:57:46 +00:00
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function stopRecording() {
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Module.set_status("paused");
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doRecording = false;
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audio0 = null;
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audio = null;
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context = null;
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}
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function startRecording() {
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if (!context) {
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context = new AudioContext({
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2022-11-26 09:40:06 +00:00
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sampleRate: kSampleRate,
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2022-11-25 21:57:46 +00:00
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channelCount: 1,
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echoCancellation: false,
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autoGainControl: true,
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noiseSuppression: true,
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});
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}
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Module.set_status("");
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document.getElementById('start').disabled = true;
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document.getElementById('stop').disabled = false;
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doRecording = true;
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startTime = Date.now();
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var chunks = [];
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var stream = null;
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navigator.mediaDevices.getUserMedia({audio: true, video: false})
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.then(function(s) {
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stream = s;
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mediaRecorder = new MediaRecorder(stream);
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mediaRecorder.ondataavailable = function(e) {
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chunks.push(e.data);
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var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
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var reader = new FileReader();
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reader.onload = function(event) {
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var buf = new Uint8Array(reader.result);
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if (!context) {
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return;
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}
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context.decodeAudioData(buf.buffer, function(audioBuffer) {
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var offlineContext = new OfflineAudioContext(audioBuffer.numberOfChannels, audioBuffer.length, audioBuffer.sampleRate);
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var source = offlineContext.createBufferSource();
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source.buffer = audioBuffer;
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source.connect(offlineContext.destination);
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source.start(0);
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offlineContext.startRendering().then(function(renderedBuffer) {
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audio = renderedBuffer.getChannelData(0);
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//printTextarea('js: audio recorded, size: ' + audio.length + ', old size: ' + (audio0 == null ? 0 : audio0.length));
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var audioAll = new Float32Array(audio0 == null ? audio.length : audio0.length + audio.length);
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if (audio0 != null) {
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audioAll.set(audio0, 0);
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}
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audioAll.set(audio, audio0 == null ? 0 : audio0.length);
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if (instance) {
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Module.set_audio(instance, audioAll);
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}
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});
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}, function(e) {
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audio = null;
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});
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}
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reader.readAsArrayBuffer(blob);
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};
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mediaRecorder.onstop = function(e) {
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if (doRecording) {
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setTimeout(function() {
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startRecording();
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});
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}
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};
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2022-11-26 09:40:06 +00:00
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mediaRecorder.start(kIntervalAudio_ms);
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})
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.catch(function(err) {
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printTextarea('js: error getting audio stream: ' + err);
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});
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var interval = setInterval(function() {
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if (!doRecording) {
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clearInterval(interval);
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mediaRecorder.stop();
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stream.getTracks().forEach(function(track) {
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track.stop();
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});
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document.getElementById('start').disabled = false;
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document.getElementById('stop').disabled = true;
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mediaRecorder = null;
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}
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// if audio length is more than kRestartRecording_s seconds, restart recording
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if (audio != null && audio.length > kSampleRate*kRestartRecording_s) {
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if (doRecording) {
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//printTextarea('js: restarting recording');
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clearInterval(interval);
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audio0 = audio;
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audio = null;
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mediaRecorder.stop();
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stream.getTracks().forEach(function(track) {
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track.stop();
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});
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}
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}
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2022-11-26 09:40:06 +00:00
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}, 100);
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2022-11-25 21:57:46 +00:00
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}
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//
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// main
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//
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var nLines = 0;
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var intervalUpdate = null;
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var transcribedAll = '';
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function onStart() {
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if (!instance) {
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instance = Module.init('whisper.bin');
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if (instance) {
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printTextarea("js: whisper initialized, instance: " + instance);
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}
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}
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if (!instance) {
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printTextarea("js: failed to initialize whisper");
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return;
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}
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startRecording();
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intervalUpdate = setInterval(function() {
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var transcribed = Module.get_transcribed();
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if (transcribed != null && transcribed.length > 1) {
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transcribedAll += transcribed + '<br>';
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nLines++;
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// if more than 10 lines, remove the first line
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if (nLines > 10) {
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var i = transcribedAll.indexOf('<br>');
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if (i > 0) {
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transcribedAll = transcribedAll.substring(i + 4);
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nLines--;
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}
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}
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}
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document.getElementById('state-status').innerHTML = Module.get_status();
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document.getElementById('state-transcribed').innerHTML = transcribedAll;
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}, 100);
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}
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function onStop() {
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stopRecording();
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}
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</script>
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<script type="text/javascript" src="stream.js"></script>
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</body>
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</html>
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