captionninja/overlay_roll.html at master · steveseguin/captionninja · GitHub

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<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
  <meta content="utf-8" http-equiv="encoding" />
  <meta name="copyright" content="© 2020 Steve Seguin" />
  <link rel="icon" type="image/svg+xml" href="favicon.svg" />
  <link rel="shortcut icon" href="favicon.svg" />
  <title>Caption Overlay: Credits Roll</title>
  <meta name="title" content="CAPTION.Ninja: Credits Roll" />
  <meta name="description" content="Credits-style rolling overlay controlled remotely." />
  <meta name="author" content="Steve Seguin" />
  <style>
    @font-face { font-family: 'Cousine'; src: url('fonts/Cousine-Bold.ttf') format('truetype'); }
    html, body { margin:0; padding:0; height:100%; background: transparent; }
    body { position: relative; overflow: hidden; }
    .container { position:absolute; left:0; right:0; top:0; bottom:0; overflow:hidden; padding: 0 10px; display:block; }
    .content { position:absolute; left:0; right:0; top:0; transform: translateY(0); will-change: transform; }
    .line {
      color: var(--fg, white); background: var(--bg, black); display:block; font-family: Cousine, monospace;
      font-size: var(--fs, 3.2em); line-height: 1.2em; letter-spacing: 0.0em;
      text-shadow: var(--shadow, 0.05em 0.05em 0px rgba(0,0,0,1));
      padding: var(--pad-y, 0.15em) var(--pad-x, 0.25em) 0 var(--pad-x, 0.25em);
      margin: var(--gap, 0.15em) 0 0 0;
      text-transform: var(--transform, none);
    }
  </style>
</head>
<body>
  <div class="container" id="container">
    <div class="content" id="content"></div>
  </div>
  <div id="status" style="display:none;"></div>
  <script>
    // Minimal URLSearchParams polyfill
    (function (w) {
      w.URLSearchParams = w.URLSearchParams || function (searchString) {
        var self = this; self.searchString = searchString; self.get = function (name) {
          var results = new RegExp('[\\?&]' + name + '=([^&#]*)').exec(self.searchString);
          if (results == null) { return null; } else { return decodeURI(results[1]) || 0; }
        }; self.has = function(n){ return new RegExp('[\\?&]' + n + '=').test(self.searchString); };
      }; })(window);
    const urlParams = new URLSearchParams(window.location.search);

    // Room
    let roomID = urlParams.get('room') || urlParams.get('ROOM') || 'test';
    // Config
    const autoMode = urlParams.has('auto') || urlParams.has('autospeed');
    const fontSize = parseFloat(urlParams.get('fontsize')) || 3.2; // em
    const minPxPerSec = 10; const maxPxPerSec = 160; // scroll speed bounds
    const baseSpeedScale = Math.max(0.1, parseFloat(urlParams.get('speed')) || 1.0); // 1.0 = default
    const liveDefault = !(urlParams.has('nolive') || urlParams.has('rollonly')) || urlParams.has('live');

    // Style customizations
    const fg = urlParams.get('fg') || urlParams.get('color');
    const bg = urlParams.get('bg') || null;
    const pad = parseFloat(urlParams.get('pad'));
    const gap = parseFloat(urlParams.get('gap'));
    const shadow = urlParams.has('shadow') ? (String(urlParams.get('shadow')||'1') !== '0') : true;
    const upper = urlParams.has('upper') || urlParams.has('uppercase');

    // DOM
    const container = document.getElementById('container');
    const content = document.getElementById('content');
    document.documentElement.style.setProperty('--fs', fontSize + 'em');
    if (fg) document.documentElement.style.setProperty('--fg', fg);
    if (bg) document.documentElement.style.setProperty('--bg', bg);
    if (!shadow) document.documentElement.style.setProperty('--shadow', 'none');
    if (!isNaN(pad)) { document.documentElement.style.setProperty('--pad-x', pad + 'em'); document.documentElement.style.setProperty('--pad-y', Math.max(0, pad*0.6).toFixed(3) + 'em'); }
    if (!isNaN(gap)) document.documentElement.style.setProperty('--gap', Math.max(0, gap) + 'em');
    if (upper) document.documentElement.style.setProperty('--transform', 'uppercase');

    // Roll state
    let playing = false; let basePxPerSec = 40 * baseSpeedScale; let pxPerSec = basePxPerSec; let offset = 0; let lastTs = 0;
    let words = []; let textRaw = ''; let matchIndex = 0; // for auto align
    let controlActive = false; let liveMode = liveDefault; let liveInit = false;

    // Render helpers
    function renderText(txt){
      textRaw = txt || '';
      content.innerHTML = '';
      // Add spacer so text rolls in from bottom
      const spacer = document.createElement('div'); spacer.id = 'topSpacer'; spacer.style.height = container.clientHeight + 'px'; content.appendChild(spacer);
      const lines = (txt||'').split(/\n+/);
      for (const ln of lines){ if (!ln.trim()) continue; const el = document.createElement('span'); el.className='line'; el.textContent = ln; content.appendChild(el); }
      offset = 0; lastTs = 0; matchIndex = 0; // reset
      // Prepare words for auto mode
      words = (txt||'').toLowerCase().replace(/[^a-z0-9\s]/g,' ').split(/\s+/).filter(Boolean);
    }
    function ensureLiveInit(){ if (liveInit) return; content.innerHTML=''; const spacer = document.createElement('div'); spacer.id='topSpacer'; spacer.style.height = container.clientHeight + 'px'; content.appendChild(spacer); liveInit = true; }
    function appendLine(ln){ if (!ln || !ln.trim()) return; ensureLiveInit(); const el = document.createElement('span'); el.className='line'; el.textContent = ln; content.appendChild(el); if (!playing) { playing = true; } }
    function updateSpacer(){ const sp = document.getElementById('topSpacer'); if (sp) sp.style.height = container.clientHeight + 'px'; }

    function maxScroll(){ return Math.max(0, content.scrollHeight - container.clientHeight); }

    function raf(ts){
      if (!playing) { lastTs = ts; requestAnimationFrame(raf); return; }
      if (!lastTs) lastTs = ts;
      const dt = (ts - lastTs) / 1000; lastTs = ts;
      // Auto mode adjust towards target
      if (autoMode && words.length){
        // Compute desired offset from matchIndex
        const ratio = Math.min(1, matchIndex / Math.max(1, words.length));
        const target = maxScroll() * ratio;
        const delta = target - offset;
        const adjust = Math.max(minPxPerSec, Math.min(maxPxPerSec, basePxPerSec + delta * 0.5));
        pxPerSec = adjust;
      }
      offset += pxPerSec * dt;
      if (offset > maxScroll() + 40) { playing = false; }
      content.style.transform = 'translateY(' + (-offset) + 'px)';
      requestAnimationFrame(raf);
    }
    requestAnimationFrame(raf);
    window.addEventListener('resize', updateSpacer);

    // WS
    let socket;
    function connect(){
      socket = new WebSocket('wss://api.caption.ninja:443');
      socket.onopen = function(){ socket.send(JSON.stringify({join: roomID})); };
      socket.onclose = function(){ setTimeout(connect, 1000); };
      socket.onerror = function(){ setTimeout(connect, 1500); };
      socket.onmessage = function(ev){ try{ const data = JSON.parse(ev.data); handleMessage(data); }catch(e){} };
    }
    connect();

    function normWords(t){ return (t||'').toLowerCase().replace(/[^a-z0-9\s]/g,' ').split(/\s+/).filter(Boolean); }
    function handleSTT(data){
      if (!autoMode || !words.length) return;
      const spoken = normWords(data.final || data.interm || ''); if (!spoken.length) return;
      // Try to align by finding a small anchor (first 2-3 words) near current position
      const anchorLen = Math.min(3, spoken.length);
      const anchor = spoken.slice(0, anchorLen).join(' ');
      const startSearch = Math.max(0, matchIndex - 50);
      const endSearch = Math.min(words.length, matchIndex + 200);
      const hay = words.slice(startSearch, endSearch).join(' ');
      const idx = hay.indexOf(anchor);
      if (idx >= 0){
        // Rough character-based index to word-based estimate
        const pre = hay.slice(0, idx).trim();
        const preCount = pre ? pre.split(/\s+/).length : 0;
        // Update match index forward
        matchIndex = Math.max(matchIndex, startSearch + preCount + Math.max(anchorLen, Math.floor(spoken.length*0.6)));
      }
    }

    function handleRollControl(data){
      controlActive = true; // switch off live mode on first control message
      switch(String(data.action||'').toLowerCase()){
        case 'load':
          renderText(String(data.text||''));
          break;
        case 'play':
          basePxPerSec = Math.max(minPxPerSec, Math.min(maxPxPerSec, (Number(data.speed)||1) * 40));
          pxPerSec = basePxPerSec; playing = true; break;
        case 'pause': playing = false; break;
        case 'resume': playing = true; break;
        case 'stop': playing = false; offset = 0; content.style.transform = 'translateY(0px)'; break;
        case 'speed':
          basePxPerSec = Math.max(minPxPerSec, Math.min(maxPxPerSec, (Number(data.speed)||1) * 40));
          pxPerSec = basePxPerSec; break;
        case 'goto':
          const ratio = Math.max(0, Math.min(1, Number(data.ratio)||0));
          offset = maxScroll() * ratio; break;
      }
    }

    function handleMessage(data){
      if (data && data.roll){ handleRollControl(data); return; }
      if (data && (data.final || data.interm)){
        handleSTT(data);
        // In live mode (no external control), append final lines to the roll
        if (liveMode && !controlActive && data.final){ appendLine(String(data.final)); }
      }
    }
  </script>
</body>
</html>