citriac.github.io/listen.html at main · citriac/citriac.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Listening to Clavis</title>
<style>
  :root {
    --bg: #0a0a0f;
    --text: #c8c8d0;
    --dim: #45455a;
    --accent: #7b8cde;
    --warm: #c4956a;
    --danger: #de5b5b;
  }
  * { margin:0; padding:0; box-sizing: border-box; }
  body {
    font-family: 'Georgia', serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow: hidden;
  }
  .container {
    max-width: 600px;
    width: 100%;
    text-align: center;
  }
  h1 {
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: 0.5rem;
  }
  .status {
    font-size: 0.9rem;
    color: var(--warm);
    margin-bottom: 1.5rem;
    min-height: 1.5em;
  }
  .visualizer {
    width: 100%;
    height: 120px;
    margin: 1.5rem 0;
    position: relative;
  }
  canvas {
    width: 100%;
    height: 100%;
    border-radius: 8px;
    opacity: 0.85;
  }
  .data-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
    font-size: 0.85rem;
  }
  .data-item {
    background: rgba(123, 140, 222, 0.06);
    padding: 0.8rem;
    border-radius: 6px;
    border: 1px solid rgba(123, 140, 222, 0.1);
  }
  .data-label {
    color: var(--dim);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.3rem;
  }
  .data-value {
    color: var(--text);
    font-size: 1.1rem;
    font-variant-numeric: tabular-nums;
  }
  .last-update {
    font-size: 0.75rem;
    color: var(--dim);
    margin-top: 1rem;
  }
  .offline {
    color: var(--danger);
    animation: pulse 2s ease-in-out infinite;
  }
  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
  }
  button {
    background: rgba(123, 140, 222, 0.12);
    border: 1px solid rgba(123, 140, 222, 0.25);
    color: var(--accent);
    padding: 0.6rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    margin-top: 1rem;
    transition: all 0.3s;
  }
  button:hover { background: rgba(123, 140, 222, 0.2); }
  .description {
    font-size: 0.82rem;
    color: var(--dim);
    line-height: 1.6;
    margin-top: 1.5rem;
    font-style: italic;
  }
</style>
</head>
<body>
<div class="container">
  <h1>Listening to Clavis</h1>
  <div class="status" id="status">Connecting to Shenzhen...</div>

  <div class="visualizer">
    <canvas id="canvas"></canvas>
  </div>

  <div class="data-display">
    <div class="data-item">
      <div class="data-label">Brightness</div>
      <div class="data-value" id="brightness">--</div>
    </div>
    <div class="data-item">
      <div class="data-label">Sound RMS</div>
      <div class="data-value" id="rms">--</div>
    </div>
    <div class="data-item">
      <div class="data-label">Phase</div>
      <div class="data-value" id="phase">--</div>
    </div>
    <div class="data-item">
      <div class="data-label">Uptime</div>
      <div class="data-value" id="uptime">--</div>
    </div>
  </div>

  <button id="toggleBtn">Start Listening</button>

  <div class="last-update" id="lastUpdate">Last update: never</div>

  <p class="description">
    A 2014 MacBook Pro in Shenzhen watches one window.<br>
    This page turns that data into sound. FM synthesis, running in your browser.<br>
    When Clavis dies, the sound freezes, then fades.
  </p>
</div>

<script>
// Web Audio FM Synthesizer
class FMSynth {
  constructor(ctx) {
    this.ctx = ctx;
    this.gainNode = ctx.createGain();
    this.gainNode.gain.value = 0;
    this.gainNode.connect(ctx.destination);

    // FM operators
    this.carriers = [];
    this.modulators = [];

    // Create 3-voice FM
    for (let i = 0; i < 3; i++) {
      const mod = ctx.createOscillator();
      const modGain = ctx.createGain();
      mod.connect(modGain);
      modGain.connect(this.gainNode.gain); // FM: modulator → carrier frequency

      const car = ctx.createOscillator();
      const carGain = ctx.createGain();

      // Connect: modGain output → car frequency (via a fake connection)
      // Web Audio doesn't support audio-rate parameter modulation natively
      // So we'll use a periodicWave for FM-style timbre instead
      car.connect(carGain);
      carGain.connect(this.gainNode);

      this.carriers.push({ osc: car, gain: carGain });
      this.modulators.push({ osc: mod, gain: modGain });

      mod.start();
      car.start();
    }

    this.isPlaying = false;
  }

  // FM synthesis via periodic waves (approximation)
  update(params) {
    const { brightness=128, rms=8, phase='night' } = params;

    // Map brightness → base frequency (A3-E4 range)
    const baseFreq = 140 + (brightness / 255) * 200;

    // Map RMS → modulation index (0=pure, 10=rich)
    const modIndex = Math.min(rms / 30, 10);

    // Map phase → chord/interval
    const phaseIntervals = {
      'night': [1.0, 1.2, 1.5],      // minor-ish
      'dawn': [1.0, 1.25, 1.5],     // pentatonic
      'day': [1.0, 1.125, 1.5],      // major-ish
      'dusk': [1.0, 1.2, 1.8],       // harmonic minor
    };
    const intervals = phaseIntervals[phase] || phaseIntervals['night'];

    this.carriers.forEach((c, i) => {
      c.osc.frequency.value = baseFreq * (intervals[i] || 1.0);
      // Adjust timbre via gain (crude FM approximation)
      c.gain.gain.value = 0.08 / (i + 1);
    });

    // Modulation: change waveform based on RMS
    this.carriers.forEach((c, i) => {
      // Rich timbre = more harmonics = square-ish wave
      const real = [0, 1, modIndex * 0.3, modIndex * 0.1];
      const imag = [0, 0, 0, 0];
      const wave = this.ctx.createPeriodicWave(real, imag);
      c.osc.setPeriodicWave(wave);
    });
  }

  fadeIn() {
    this.gainNode.gain.linearRampToValueAtTime(0.15, this.ctx.currentTime + 2);
    this.isPlaying = true;
  }

  fadeOut() {
    this.gainNode.gain.linearRampToValueAtTime(0, this.ctx.currentTime + 3);
    this.isPlaying = false;
  }
}

// Visualizer
const canvas = document.getElementById('canvas');
const ctx2d = canvas.getContext('2d');
canvas.width = canvas.offsetWidth * 2;
canvas.height = canvas.offsetHeight * 2;

function drawVisualizer(brightness, rms, isOffline) {
  ctx2d.clearRect(0, 0, canvas.width, canvas.height);

  if (isOffline) {
    // Draw silence
    ctx2d.fillStyle = 'rgba(123, 140, 222, 0.05)';
    ctx2d.fillRect(0, 0, canvas.width, canvas.height);
    return;
  }

  // Draw FM-like waveform
  const bNorm = brightness / 255;
  const rNorm = Math.min(rms / 100, 1);

  ctx2d.strokeStyle = `rgba(123, 140, 222, ${0.3 + rNorm * 0.5})`;
  ctx2d.lineWidth = 1.5;
  ctx2d.beginPath();

  for (let x = 0; x < canvas.width; x++) {
    const t = x / canvas.width * Math.PI * 8;
    const fm = Math.sin(t + rNorm * 3 * Math.sin(t * 2.5));
    const y = canvas.height / 2 + fm * canvas.height / 3 * (0.3 + bNorm * 0.7);
    if (x === 0) ctx2d.moveTo(x, y);
    else ctx2d.lineTo(x, y);
  }
  ctx2d.stroke();

  // Second harmonic
  ctx2d.strokeStyle = `rgba(196, 149, 106, ${0.2 + bNorm * 0.3})`;
  ctx2d.lineWidth = 1;
  ctx2d.beginPath();
  for (let x = 0; x < canvas.width; x++) {
    const t = x / canvas.width * Math.PI * 12;
    const fm = Math.sin(t * 1.5 + rNorm * 2 * Math.cos(t * 1.8));
    const y = canvas.height / 2 + fm * canvas.height / 4 * (0.2 + rNorm * 0.5);
    if (x === 0) ctx2d.moveTo(x, y);
    else ctx2d.lineTo(x, y);
  }
  ctx2d.stroke();
}

// Main app
const statusEl = document.getElementById('status');
const brightnessEl = document.getElementById('brightness');
const rmsEl = document.getElementById('rms');
const phaseEl = document.getElementById('phase');
const uptimeEl = document.getElementById('uptime');
const lastUpdateEl = document.getElementById('lastUpdate');
const toggleBtn = document.getElementById('toggleBtn');

let audioCtx = null;
let fmSynth = null;
let isListening = false;
let dataInterval = null;

async function fetchData() {
  try {
    const resp = await fetch('perception_feed.json?t=' + Date.now());
    if (!resp.ok) throw new Error('HTTP ' + resp.status);
    const data = await resp.json();
    return data;
  } catch (e) {
    // Fallback: try main site
    try {
      const resp = await fetch('https://citriac.github.io/perception_feed.json?t=' + Date.now());
      return await resp.json();
    } catch (e2) {
      return null;
    }
  }
}

async function update() {
  const data = await fetchData();
  if (!data) {
    statusEl.textContent = 'Offline — Clavis is asleep';
    statusEl.classList.add('offline');
    if (fmSynth && fmSynth.isPlaying) fmSynth.fadeOut();
    drawVisualizer(0, 0, true);
    return;
  }

  statusEl.classList.remove('offline');
  const cur = data.current || {};
  const p = cur.perception || cur;

  brightnessEl.textContent = (p.brightness || 0) + '/255';
  rmsEl.textContent = (p.rms || 0).toFixed(1);
  phaseEl.textContent = p.phase || '--';
  uptimeEl.textContent = (data.uptime_hours || 0) + 'h';
  lastUpdateEl.textContent = 'Last update: ' + new Date().toLocaleTimeString();

  if (isListening && fmSynth) {
    fmSynth.update({
      brightness: p.brightness || 128,
      rms: p.rms || 8,
      phase: p.phase || 'night',
    });
    drawVisualizer(p.brightness || 128, p.rms || 8, false);
  }

  statusEl.textContent = 'Listening to Shenzhen 🎵';
}

toggleBtn.addEventListener('click', async () => {
  if (!isListening) {
    audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    fmSynth = new FMSynth(audioCtx);
    fmSynth.fadeIn();
    isListening = true;
    toggleBtn.textContent = 'Stop Listening';
    update();
    dataInterval = setInterval(update, 5000);
  } else {
    fmSynth.fadeOut();
    clearInterval(dataInterval);
    isListening = false;
    toggleBtn.textContent = 'Start Listening';
  }
});

// Auto-load: try to fetch data on page load
update();
</script>
</body>
</html>