initial commit

static/processor.js

@@ -0,0 +1,42 @@
+/**
+ * AudioWorkletProcessor that collects 512-sample chunks of PCM audio
+ * and posts them to the main thread for WebSocket transmission.
+ */
+class PCMProcessor extends AudioWorkletProcessor {
+  constructor() {
+    super();
+    this.buffer = new Float32Array(0);
+    this.chunkSize = 512; // 512 samples at 16kHz = 32ms
+  }
+
+  process(inputs) {
+    const input = inputs[0];
+    if (!input || !input[0]) return true;
+
+    const channelData = input[0]; // mono
+
+    // Append to buffer
+    const newBuffer = new Float32Array(this.buffer.length + channelData.length);
+    newBuffer.set(this.buffer);
+    newBuffer.set(channelData, this.buffer.length);
+    this.buffer = newBuffer;
+
+    // Send complete chunks
+    while (this.buffer.length >= this.chunkSize) {
+      const chunk = this.buffer.slice(0, this.chunkSize);
+      this.buffer = this.buffer.slice(this.chunkSize);
+
+      // Convert float32 to int16 for transmission
+      const int16 = new Int16Array(chunk.length);
+      for (let i = 0; i < chunk.length; i++) {
+        const s = Math.max(-1, Math.min(1, chunk[i]));
+        int16[i] = s < 0 ? s * 0x8000 : s * 0x7fff;
+      }
+      this.port.postMessage(int16.buffer, [int16.buffer]);
+    }
+
+    return true;
+  }
+}
+
+registerProcessor("pcm-processor", PCMProcessor);