Camera

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Eclatira camera session</title>
    <style>
      body {
        margin: 0;
        padding: 24px 16px;
        font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, sans-serif;
      }
      main { max-width: 760px; margin: 0 auto; }
      button { font: inherit; font-weight: 600; padding: 10px 18px; border-radius: 8px; }
      button[disabled] { opacity: 0.45; cursor: not-allowed; }
      #preview {
        width: 100%;
        max-width: 640px;
        background: #000;
        border-radius: 10px;
        margin: 16px 0;
        transform: scaleX(-1);
      }
      #status { margin-left: 12px; font-size: 13px; color: #6b7280; }
      #log { border: 1px solid #e5e7eb; border-radius: 10px; padding: 12px; min-height: 140px; }
      .line { padding: 4px 0; }
      .who { font-weight: 600; margin-right: 6px; }
      .err { color: #dc2626; }
    </style>
  </head>
  <body>
    <main>
      <h1>Show the agent your camera</h1>

      <button id="start">Start camera session</button>
      <button id="stop" disabled>Stop</button>
      <span id="status">idle</span>

      <!-- The preview is mirrored in CSS because users expect a mirror image of
           themselves. The frames sent to the agent are NOT mirrored: the CSS
           transform does not affect what the canvas reads out of the element,
           so text the user holds up stays readable to the model. -->
      <video id="preview" muted playsinline></video>

      <div id="log"></div>
    </main>

    <script type="module">
      // Loaded straight from the CDN mirror of the published npm package, pinned
      // to an exact version. Using a bundler? npm install @eclatira/realtime and
      // import "@eclatira/realtime" instead.
      import { EclatiraSession } from "https://cdn.jsdelivr.net/npm/@eclatira/realtime@0.1.3/eclatira-realtime.js";

      const startButton = document.getElementById("start");
      const stopButton = document.getElementById("stop");
      const statusText = document.getElementById("status");
      const log = document.getElementById("log");
      const preview = document.getElementById("preview");

      let session = null;
      let liveLine = null;
      let liveSpeaker = null;

      function write(speaker, text, isError) {
        // Transcripts arrive as successive revisions of the current utterance,
        // so replace the live line instead of appending a fragment per update.
        if (speaker !== liveSpeaker || !liveLine) {
          liveLine = document.createElement("div");
          liveLine.className = "line";
          liveLine.innerHTML = '<span class="who"></span><span class="text"></span>';
          liveLine.querySelector(".who").textContent = speaker;
          log.appendChild(liveLine);
          liveSpeaker = speaker;
        }
        const span = liveLine.querySelector(".text");
        span.textContent = text;
        if (isError) span.classList.add("err");
      }

      startButton.addEventListener("click", async () => {
        startButton.disabled = true;
        statusText.textContent = "connecting";

        session = new EclatiraSession({
          tokenUrl: "/api/eclatira/token",
        });

        session.on("transcript", ({ speaker, text, final }) => {
          write(speaker, text);
          if (final) liveSpeaker = null;
        });

        session.on("speakingchange", ({ user, agent }) => {
          statusText.textContent = agent ? "agent speaking" : user ? "listening" : "live";
        });

        // Server-side frame rejections and the no-audio warning both arrive
        // here. Surface them; they are the difference between debugging this in
        // a minute and debugging it in a day.
        session.on("error", (error) => write("error", error.code + ": " + error.message, true));

        session.on("close", ({ code, reason }) => {
          statusText.textContent = "closed " + code + (reason ? " " + reason : "");
        });

        session.on("stopped", () => {
          startButton.disabled = false;
          stopButton.disabled = true;
          statusText.textContent = "idle";
        });

        try {
          await session.start({ source: "camera", videoElement: preview });
          statusText.textContent = "live";
          stopButton.disabled = false;
        } catch (error) {
          write("error", error.message, true);
          statusText.textContent = "failed";
          startButton.disabled = false;
        }
      });

      stopButton.addEventListener("click", () => session && session.stop());
    </script>
  </body>
</html>

You receive still images from the user's camera about once a second, not
continuous video. You cannot see motion between frames.

When you need to see something clearly, ask the user to hold it still and steady
in front of the camera, then wait a few seconds before commenting.

If an image is blurry, dark, or cut off, say so and ask for a better view rather
than guessing. Do not describe what you expect to see; describe what is in the
image.

Never claim to have watched something happen. You saw a sequence of stills.