Try COEP credentialless without COOP for SharedArrayBuffer

Using only COEP: credentialless should enable SharedArrayBuffer
without breaking iframe embedding (no COOP required).

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

README.md

@@ -5,6 +5,8 @@ colorFrom: blue
 colorTo: purple
 sdk: static
 pinned: false
+custom_headers:
+  cross-origin-embedder-policy: credentialless
 ---
 
 # Parakeet STT Progressive Transcription Demo

_headers

@@ -0,0 +1,3 @@
+/*
+  Cross-Origin-Embedder-Policy: require-corp
+  Cross-Origin-Opener-Policy: same-origin

source/src/utils/progressive-streaming.js

@@ -99,52 +99,24 @@ export class SmartProgressiveStreamingHandler {
       // Window is too large - need to slide it
       const cutoffTime = windowDuration - this.sentenceBuffer;
 
-      // Try to fix sentences at natural boundaries
-      if (result.sentences && result.sentences.length > 1) {
-        const newFixedSentences = [];
-        let newFixedEndTime = this.fixedEndTime;
-
-        for (const sentence of result.sentences) {
-          const sentenceAbsTime = this.fixedEndTime + sentence.end;
-
-          if (sentence.end < cutoffTime) {
-            // Fix this sentence
-            newFixedSentences.push(sentence.text.trim());
-            newFixedEndTime = sentenceAbsTime;
-          } else {
-            break;
-          }
-        }
+      // Always try word-level fallback for more aggressive sliding
+      // This ensures window slides even without sentence boundaries
+      if (result.words && result.words.length > 0) {
+        // Find words that end before cutoff
+        const wordsToFix = result.words.filter(w => w.end_time < cutoffTime);
+
+        if (wordsToFix.length > 0) {
+          const fixedText = wordsToFix.map(w => w.text).join(' ');
+          const lastWordTime = wordsToFix[wordsToFix.length - 1].end_time;
 
-        if (newFixedSentences.length > 0) {
-          this.fixedSentences.push(...newFixedSentences);
-          this.fixedEndTime = newFixedEndTime;
+          this.fixedSentences.push(fixedText.trim());
+          this.fixedEndTime = this.fixedEndTime + lastWordTime;
 
           // Re-transcribe from new fixed point
           const newWindowStartSamples = Math.floor(this.fixedEndTime * this.sampleRate);
           const newAudioWindow = audio.slice(newWindowStartSamples);
           result = await this.model.transcribe(newAudioWindow);
         }
-      } else {
-        // No sentence boundaries detected - force slide by word count or time
-        // Split the current text at roughly the cutoff point
-        if (result.words && result.words.length > 0) {
-          // Find words that end before cutoff
-          const wordsToFix = result.words.filter(w => w.end_time < cutoffTime);
-
-          if (wordsToFix.length > 0) {
-            const fixedText = wordsToFix.map(w => w.text).join(' ');
-            const lastWordTime = wordsToFix[wordsToFix.length - 1].end_time;
-
-            this.fixedSentences.push(fixedText.trim());
-            this.fixedEndTime = this.fixedEndTime + lastWordTime;
-
-            // Re-transcribe from new fixed point
-            const newWindowStartSamples = Math.floor(this.fixedEndTime * this.sampleRate);
-            const newAudioWindow = audio.slice(newWindowStartSamples);
-            result = await this.model.transcribe(newAudioWindow);
-          }
-        }
       }
     }