Restored to '84d7de2da64f8f2fd1e2d64959817c64c8fb7c04'

Replit-Restored-To: 84d7de2da6

client/replit_integrations/audio/audio-utils.ts

@@ -0,0 +1,36 @@
+/**
+ * Audio utility functions for voice chat.
+ * Handles PCM16 decoding and AudioContext initialization.
+ */
+
+/**
+ * Decode base64 PCM16 audio to Float32Array for Web Audio API
+ */
+export function decodePCM16ToFloat32(base64Audio: string): Float32Array {
+  const raw = atob(base64Audio);
+  const bytes = new Uint8Array(raw.length);
+  for (let i = 0; i < raw.length; i++) {
+    bytes[i] = raw.charCodeAt(i);
+  }
+  const pcm16 = new Int16Array(bytes.buffer);
+  const float32 = new Float32Array(pcm16.length);
+  for (let i = 0; i < pcm16.length; i++) {
+    float32[i] = pcm16[i] / 32768;
+  }
+  return float32;
+}
+
+/**
+ * Create and initialize AudioContext with worklet
+ */
+export async function createAudioPlaybackContext(
+  workletPath = "/audio-playback-worklet.js",
+  sampleRate = 24000
+): Promise<{ ctx: AudioContext; worklet: AudioWorkletNode }> {
+  const ctx = new AudioContext({ sampleRate });
+  await ctx.audioWorklet.addModule(workletPath);
+  const worklet = new AudioWorkletNode(ctx, "audio-playback-processor");
+  worklet.connect(ctx.destination);
+  return { ctx, worklet };
+}
+