Divert WebRTC Audio to ClutchCall

import { MoqtClient, captureMicrophone, OpusPlayer } from "@clutchcall/sdk/moqt";

async function divertToQuic(sid: string, token: string) {
  // requireEncodedTransform: refuse to connect if this browser can't run the
  // worker RTCRtpScriptTransform, so the encoded-frame rule holds all session.
  const client = await MoqtClient.connect(
    "quic://relay.clutchcall.dev",
    token,
    (state) => console.log("moqt", state),
    { requireEncodedTransform: true },
  );

  // Uplink: publish the mic track (distinct name from the speaker track so the
  // relay never fans your own audio back to you).
  const uplink = client.publishAudio(`moqtaudio/${sid}`, "mic", {
    capability: "agent.mic.opus",
  });

  // captureMicrophone runs the loopback pc + worker transform and writes each
  // encoded Opus frame straight to `uplink` (raw PCM never crosses the wire).
  const mic = await captureMicrophone(uplink, {
    audioConstraints: {
      echoCancellation: true,
      autoGainControl: true,
      noiseSuppression: true,
    },
  });

  // Downlink: decode the agent/caller audio and play it back.
  const ctx = new AudioContext();
  const player = new OpusPlayer(ctx, { sampleRate: 48000, channels: 1 });
  await player.start();
  client.subscribeAudio(`moqtaudio/${sid}`, "spk", (tsUs, opus) => player.push(tsUs, opus));

  return function hangUp() {
    mic.stop();        // tears down the capture graph (not the publication)
    player.close();
    client.close();
  };
}