Add download progress bar for model loading

- Create Progress component showing file download progress
- Track initiate/progress/done messages from parakeet.js
- Display progress bars with file name, percentage, and total size
- Forward progress callback from fromHub to main thread
- Show download status during model loading phase

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

assets/index-B70hdNPb.css

@@ -0,0 +1 @@
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assets/worker-DM89LVm6.js

@@ -0,0 +1 @@
+async function u(t,r={}){const{getParakeetModel:e}=await import("./hub-BlMT648A.js"),{ParakeetModel:s}=await import("./parakeet-xcg-VHSn.js"),{MODELS:n}=await import("./models-Dq2DCePq.js"),a=n[t]?.repoId||t,o=await e(a,r);return s.fromUrls({...o.urls,filenames:o.filenames,preprocessorBackend:o.preprocessorBackend,...r})}let c=null,l=!1;async function g(t="parakeet-tdt-0.6b-v3",r={}){if(l)return{status:"loading",message:"Model is already loading..."};if(c)return{status:"ready",message:"Model already loaded"};try{l=!0;const e=r.device==="webgpu"?"webgpu-hybrid":"wasm";self.postMessage({status:"loading",message:`Downloading Parakeet ${t}... (~2.1GB, this may take 1-2 minutes)`}),console.log(`[Worker] Loading model with backend: ${e}`),c=await u(t,{backend:e,...e==="wasm"?{encoderQuant:"int8",decoderQuant:"int8",preprocessor:"nemo128"}:{encoderQuant:"fp32",decoderQuant:"int8",preprocessor:"nemo128"},progress:i=>{self.postMessage(i)}});const a=c.session?.executionProviders?.[0]||e;console.log(`[Worker] Model loaded. Requested: ${e}, Actual provider: ${a}`),self.postMessage({status:"loading",message:"Model downloaded, warming up..."});const o=new Float32Array(16e3);return await c.transcribe(o,16e3),self.postMessage({status:"ready",message:`Parakeet ${t} loaded successfully!`,device:e,modelVersion:t}),{status:"ready",device:e}}catch(e){return console.error("Failed to load model:",e),self.postMessage({status:"error",message:`Failed to load model: ${e.message}`,error:e.toString()}),{status:"error",error:e.toString()}}finally{l=!1}}async function m(t,r=null){if(!c)throw new Error("Model not loaded. Call load() first.");try{const e=performance.now(),s=await c.transcribe(t,16e3,{returnTimestamps:!0,returnConfidences:!0,temperature:1}),a=(performance.now()-e)/1e3,o=t.length/16e3,i=o/a,d=p(s.words||[]);return{text:s.utterance_text||"",sentences:d,words:s.words||[],chunks:s.words||[],metadata:{latency:a,audioDuration:o,rtf:i,language:r,confidence:s.confidence_scores,metrics:s.metrics}}}catch(e){throw console.error("Transcription error:",e),e}}function p(t){if(!t||t.length===0)return[];const r=[];let e=[],s=t[0].start_time||0;for(let n=0;n<t.length;n++){const a=t[n];e.push(a.text),(/[.!?]$/.test(a.text)||n===t.length-1)&&(r.push({text:e.join(" ").trim(),start:s,end:a.end_time||a.start_time||0}),n<t.length-1&&(e=[],s=t[n+1].start_time||a.end_time||0))}return r}self.onmessage=async t=>{const{type:r,data:e}=t.data;try{switch(r){case"load":await g(e?.modelVersion,e?.options||{});break;case"transcribe":const s=await m(e.audio,e.language);self.postMessage({status:"transcription",result:s});break;case"ping":self.postMessage({status:"pong"});break;default:self.postMessage({status:"error",message:`Unknown message type: ${r}`})}}catch(s){self.postMessage({status:"error",message:s.message,error:s.toString()})}};

index.html

@@ -6,8 +6,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="description" content="Real-time speech recognition with Parakeet STT and WebGPU acceleration. Progressive transcription demo." />
     <title>Parakeet STT Progressive Transcription | WebGPU Demo</title>
-    <script type="module" crossorigin src="/assets/index-BBJjCKoR.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-B9t0_3v7.css">
+    <script type="module" crossorigin src="/assets/index-DVS7G44a.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-B70hdNPb.css">
   </head>
   <body>
     <div id="root"></div>

source/src/App.jsx

@@ -7,6 +7,7 @@
 import { useState, useEffect, useRef } from 'react';
 import TranscriptionDisplay from './components/TranscriptionDisplay';
 import PerformanceMetrics from './components/PerformanceMetrics';
+import Progress from './components/Progress';
 import { AudioRecorder, AudioProcessor } from './utils/audio';
 import { SmartProgressiveStreamingHandler } from './utils/progressive-streaming';
 
@@ -18,6 +19,7 @@ function App() {
   const [modelStatus, setModelStatus] = useState('not_loaded');
   const [modelMessage, setModelMessage] = useState('');
   const [device, setDevice] = useState(null);
+  const [progressItems, setProgressItems] = useState([]);
 
   // Microphone device selection
   const [audioDevices, setAudioDevices] = useState([]);
@@ -80,10 +82,29 @@ function App() {
         setModelStatus('ready');
         setModelMessage(message);
         setDevice(deviceType);
+        setProgressItems([]); // Clear progress on ready
       } else if (status === 'error') {
         setModelStatus('error');
         setModelMessage(message);
         console.error('Worker error:', event.data);
+      } else if (status === 'initiate') {
+        // New file download started
+        setProgressItems((prev) => [...prev, event.data]);
+      } else if (status === 'progress') {
+        // Update progress for a file
+        setProgressItems((prev) =>
+          prev.map((item) => {
+            if (item.file === event.data.file) {
+              return { ...item, ...event.data };
+            }
+            return item;
+          })
+        );
+      } else if (status === 'done') {
+        // File download completed
+        setProgressItems((prev) =>
+          prev.filter((item) => item.file !== event.data.file)
+        );
       } else if (status === 'transcription' && result) {
         // Update performance metrics
         if (result.metadata) {
@@ -401,9 +422,27 @@ function App() {
                 </button>
               )}
               {modelStatus === 'loading' && (
-                <div className="px-6 py-3 bg-gray-700 rounded-lg font-semibold flex items-center gap-3">
-                  <div className="w-5 h-5 border-2 border-cyan-400 border-t-transparent rounded-full animate-spin"></div>
-                  Loading...
+                <div className="w-full max-w-md">
+                  <div className="mb-4 text-gray-300 text-sm">
+                    {modelMessage}
+                  </div>
+                  {progressItems.length > 0 ? (
+                    <div className="bg-gray-800/50 rounded-lg p-4">
+                      {progressItems.map((item, i) => (
+                        <Progress
+                          key={i}
+                          text={item.file}
+                          percentage={item.progress}
+                          total={item.total}
+                        />
+                      ))}
+                    </div>
+                  ) : (
+                    <div className="flex items-center gap-3 text-gray-300">
+                      <div className="w-5 h-5 border-2 border-cyan-400 border-t-transparent rounded-full animate-spin"></div>
+                      <span>Initializing...</span>
+                    </div>
+                  )}
                 </div>
               )}
               {modelStatus === 'ready' && (

source/src/components/Progress.jsx

@@ -0,0 +1,37 @@
+/**
+ * Progress Component
+ *
+ * Displays download progress for model files
+ */
+
+export default function Progress({ text, percentage, total }) {
+  const formatBytes = (bytes) => {
+    if (bytes === 0) return '0 B';
+    const k = 1024;
+    const sizes = ['B', 'KB', 'MB', 'GB'];
+    const i = Math.floor(Math.log(bytes) / Math.log(k));
+    return `${(bytes / Math.pow(k, i)).toFixed(1)} ${sizes[i]}`;
+  };
+
+  const progress = percentage || 0;
+  const totalSize = total ? formatBytes(total) : '';
+
+  return (
+    <div className="w-full mb-3">
+      <div className="flex justify-between items-center mb-1">
+        <span className="text-sm text-gray-300 truncate flex-1 mr-2">
+          {text}
+        </span>
+        <span className="text-xs text-gray-400 whitespace-nowrap">
+          {progress}% {totalSize && `(${totalSize})`}
+        </span>
+      </div>
+      <div className="w-full bg-gray-700 rounded-full h-2">
+        <div
+          className="bg-blue-500 h-2 rounded-full transition-all duration-300"
+          style={{ width: `${progress}%` }}
+        />
+      </div>
+    </div>
+  );
+}

source/src/worker.js

@@ -42,7 +42,17 @@ async function loadModel(modelVersion = 'parakeet-tdt-0.6b-v3', options = {}) {
     const quantization = backend === 'wasm'
       ? { encoderQuant: 'int8', decoderQuant: 'int8', preprocessor: 'nemo128' }  // WASM: both INT8
       : { encoderQuant: 'fp32', decoderQuant: 'int8', preprocessor: 'nemo128' };  // WebGPU-hybrid: FP32 encoder + INT8 decoder
-    model = await fromHub(modelVersion, { backend, ...quantization });
+
+    // Progress callback to forward download progress
+    const progressCallback = (progressData) => {
+      self.postMessage(progressData);
+    };
+
+    model = await fromHub(modelVersion, {
+      backend,
+      ...quantization,
+      progress: progressCallback
+    });
 
     // Check actual backend being used (parakeet.js may have fallen back)
     const actualBackend = model.session?.executionProviders?.[0] || backend;