세션 평가와 교수자 분석 보강

apps/web/public/worklets/voice-capture-worklet.js

@@ -4,6 +4,13 @@ class VoiceCaptureProcessor extends AudioWorkletProcessor {
     this.pending = [];
     this.pendingLength = 0;
     this.flushSamples = Math.max(1024, Math.floor(sampleRate * 0.25));
+    this.totalSamples = 0;
+    this.voiceSamples = 0;
+    this.silentSamples = 0;
+    this.trailingSilentSamples = 0;
+    this.sumSquares = 0;
+    this.peak = 0;
+    this.voiceThreshold = 0.018;
     this.port.onmessage = (event) => {
       if (event.data && event.data.type === "flush") {
         this.flush();
@@ -19,6 +26,17 @@ class VoiceCaptureProcessor extends AudioWorkletProcessor {
     const pcm = new Int16Array(channel.length);
     for (let i = 0; i < channel.length; i += 1) {
       const sample = Math.max(-1, Math.min(1, channel[i]));
+      const abs = Math.abs(sample);
+      this.totalSamples += 1;
+      this.sumSquares += sample * sample;
+      if (abs > this.peak) this.peak = abs;
+      if (abs >= this.voiceThreshold) {
+        this.voiceSamples += 1;
+        this.trailingSilentSamples = 0;
+      } else {
+        this.silentSamples += 1;
+        this.trailingSilentSamples += 1;
+      }
       pcm[i] = sample < 0 ? sample * 0x8000 : sample * 0x7fff;
     }
 
@@ -46,11 +64,28 @@ class VoiceCaptureProcessor extends AudioWorkletProcessor {
         sampleRate,
         channels: 1,
         sampleWidth: 2,
+        metrics: this.metrics(),
         pcm: merged.buffer,
       },
       [merged.buffer],
     );
   }
+
+  metrics() {
+    const durationMs = (this.totalSamples / sampleRate) * 1000;
+    const voiceMs = (this.voiceSamples / sampleRate) * 1000;
+    const silenceMs = (this.silentSamples / sampleRate) * 1000;
+    const trailingSilenceMs = (this.trailingSilentSamples / sampleRate) * 1000;
+    const rms = this.totalSamples > 0 ? Math.sqrt(this.sumSquares / this.totalSamples) : 0;
+    return {
+      durationMs,
+      voiceMs,
+      silenceMs,
+      trailingSilenceMs,
+      rms,
+      peak: this.peak,
+    };
+  }
 }
 
 registerProcessor("voice-capture-processor", VoiceCaptureProcessor);