sync: update from private repo (2336949a)

2026-09-17 11:29:31 +00:00
parent 28f74c4e37
commit 57702b4f34
2139 changed files with 321270 additions and 17494 deletions
@@ -0,0 +1,56 @@
+/* Stateful box-filter resampling: phase and integration survive render quanta. */
+class TranscriptionPCM extends AudioWorkletProcessor {
+  constructor() {
+    super();
+    this.ratio = sampleRate / 16000;
+    this.weight = 0;
+    this.sum = 0;
+    this.samples = [];
+    this.stopped = false;
+    this.port.onmessage = ({ data }) => {
+      if (data.type === 'flush') {
+        this.stopped = true;
+        if (this.weight > 0) this.samples.push(this.sum / this.weight);
+        this.emit();
+        this.port.postMessage({ type: 'flushed' });
+      }
+    };
+  }
+  emit() {
+    if (!this.samples.length) return;
+    const buffer = new ArrayBuffer(this.samples.length * 2);
+    const view = new DataView(buffer);
+    let energy = 0;
+    this.samples.forEach((value, index) => {
+      const sample = Math.max(-1, Math.min(1, value));
+      view.setInt16(index * 2, Math.round(sample * (sample < 0 ? 32768 : 32767)), true);
+      energy += sample * sample;
+    });
+    this.port.postMessage({ type: 'pcm', buffer, level: Math.sqrt(energy / this.samples.length) }, [buffer]);
+    this.samples = [];
+  }
+  process(inputs) {
+    if (this.stopped) return false;
+    const channels = inputs[0];
+    if (!channels?.length) return true;
+    for (let i = 0; i < channels[0].length; i++) {
+      let value = 0;
+      for (const channel of channels) value += channel[i] / channels.length;
+      let remaining = 1;
+      while (remaining > 1e-9) {
+        const take = Math.min(remaining, this.ratio - this.weight);
+        this.sum += value * take;
+        this.weight += take;
+        remaining -= take;
+        if (this.weight >= this.ratio - 1e-9) {
+          this.samples.push(this.sum / this.ratio);
+          this.sum = 0;
+          this.weight = 0;
+          if (this.samples.length >= 2400) this.emit();
+        }
+      }
+    }
+    return true;
+  }
+}
+registerProcessor('transcription-pcm', TranscriptionPCM);