Audiobook Maker Pro v4.2 — production ready
This commit is contained in:
Ashim Kumar
827
templates/public_reader.html
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827
templates/public_reader.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Audiobook Reader</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
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<link rel="preconnect" href="https://fonts.googleapis.com">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Lora:ital,wght@0,400..700;1,400..700&family=Poppins:wght@500;700&display=swap" rel="stylesheet">
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<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
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<style>
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@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
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@keyframes spin { to { transform: rotate(360deg); } }
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html { scroll-behavior: smooth; }
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body {
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background-image: linear-gradient(to top, #f3e7e9 0%, #e3eeff 99%, #e3eeff 100%);
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color: #1f2937; font-family: "Lora", serif; margin: 0;
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}
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.top-nav {
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background: rgba(255,255,255,0.9);
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backdrop-filter: blur(12px);
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padding: 12px 24px;
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box-shadow: 0 2px 8px rgba(0,0,0,0.05);
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display: flex;
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align-items: center;
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justify-content: space-between;
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position: sticky;
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top: 0;
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z-index: 50;
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}
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.back-btn {
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display: flex;
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align-items: center;
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gap: 8px;
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color: #4a2c2a;
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text-decoration: none;
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font-weight: 600;
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font-family: 'Inter', sans-serif;
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font-size: 0.9rem;
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padding: 8px 14px;
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border-radius: 8px;
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transition: background 0.2s;
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}
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.back-btn:hover { background: rgba(74,44,42,0.08); color: #4a2c2a; }
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.story-title { font-family: "Poppins", sans-serif; font-weight: 700; font-size: 2.5rem; color: #111827; }
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.story-subtitle { font-family: "Poppins", sans-serif; color: #4b5563; font-weight: 500; font-size: 1.1rem; }
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.main-content-card {
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background-color: rgba(255,255,255,0.9); backdrop-filter: blur(12px);
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border-radius: 1rem; padding: 3rem 4rem; box-shadow: 0 10px 35px rgba(0,0,0,0.08);
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border: 1px solid rgba(255,255,255,0.2); max-width: 1400px; margin: 0 auto;
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animation: fadeIn 0.5s ease-in-out;
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}
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.reader-layout { display: flex; gap: 32px; align-items: flex-start; text-align: left; }
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.document-outline {
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width: 280px; flex-shrink: 0; position: sticky; top: 80px;
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background: white; border-radius: 12px; padding: 20px;
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box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
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border: 1px solid #e2e8f0; max-height: calc(100vh - 100px); overflow-y: auto;
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}
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.outline-title {
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font-family: "Poppins", sans-serif; font-weight: 700; font-size: 0.95rem;
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color: #64748b; text-transform: uppercase; margin-bottom: 16px;
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border-bottom: 1px solid #e2e8f0; padding-bottom: 12px;
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letter-spacing: 0.5px;
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}
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.outline-list { list-style: none; padding: 0; margin: 0; }
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.outline-list li {
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padding: 10px 14px; font-size: 0.9rem; color: #334155; cursor: pointer;
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border-radius: 8px; transition: all 0.2s; white-space: nowrap;
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overflow: hidden; text-overflow: ellipsis; font-family: "Inter", sans-serif;
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margin-bottom: 4px;
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border-left: 3px solid transparent;
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}
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.outline-list li:hover { background: #f8fafc; color: #4f46e5; }
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.outline-list li.active {
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background: #e0e7ff;
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color: #3730a3;
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font-weight: 600;
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border-left: 3px solid #4f46e5;
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padding-left: 11px;
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}
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.reader-content-area { flex: 1; min-width: 0; }
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.story-text-container { font-size: 32px; line-height: 2.1; color: #1f2937; cursor: pointer; }
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.story-text-container h1, .story-text-container h2, .story-text-container h3 {
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font-family: "Poppins", sans-serif; color: #111827; line-height: 1.8;
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margin-top: 1.5em; margin-bottom: 0.8em;
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}
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.story-text-container p { margin-bottom: 1.2em; }
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.story-text-container img { max-width: 100%; height: auto; border-radius: 8px; margin: 16px auto; display: block; }
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.block-loading-spinner {
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display: inline-flex; align-items: center; gap: 8px;
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color: #6b7280; font-size: 0.9rem; font-family: "Inter", sans-serif;
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padding: 8px 0;
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}
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.block-loading-spinner::before {
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content: ''; width: 16px; height: 16px;
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border: 2px solid #e2e8f0; border-top-color: #5753c9;
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border-radius: 50%; animation: spin 0.8s linear infinite;
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}
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.word { transition: all 0.15s ease; border-radius: 3px; cursor: pointer; }
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.word:hover { background-color: #f1f5f9; }
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.current-sentence-bg {
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-webkit-box-decoration-break: clone; box-decoration-break: clone;
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background-color: #e0e7ff; padding: 0.1em 0.25em; margin: 0 -0.2em; border-radius: 8px;
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}
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.current-word { color: #3d4e81; text-decoration: underline; text-decoration-thickness: 3px; text-underline-offset: 3px; font-weight: 700; }
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.story-image-block { text-align: center; margin: 24px 0; }
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.story-image-block img { max-width: 100%; height: auto; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
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/* Floating Player Button — Fixed RIGHT side */
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#floating-player-btn {
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position: fixed;
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top: 5rem;
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right: 24px;
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height: 56px;
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min-width: 56px;
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padding: 0 24px;
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border-radius: 30px;
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background-image: linear-gradient(45deg, #3d4e81 0%, #5753c9 50%, #6e78da 100%);
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border: none;
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color: white;
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box-shadow: 0 8px 25px rgba(0,0,0,0.3);
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display: none;
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align-items: center;
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justify-content: center;
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cursor: pointer;
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z-index: 60;
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transition: transform 0.2s, opacity 0.3s, width 0.3s, padding 0.3s, border-radius 0.3s;
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gap: 8px;
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}
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#floating-player-btn.visible { display: flex; }
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#floating-player-btn:hover { transform: scale(1.05); }
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#floating-player-btn:active { transform: scale(0.95); }
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#floating-player-btn svg { width: 24px; height: 24px; }
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#fp-start-text {
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font-weight: 600;
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font-family: "Poppins", sans-serif;
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font-size: 1rem;
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}
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#floating-player-btn.active-mode {
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width: 56px;
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padding: 0;
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border-radius: 50%;
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gap: 0;
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}
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#floating-player-btn.active-mode #fp-start-text { display: none; }
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#floating-player-btn.loading { background: linear-gradient(45deg, #6b7280, #9ca3af); cursor: wait; }
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#fp-loading-spinner {
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width: 24px; height: 24px;
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border: 3px solid rgba(255,255,255,0.3); border-top-color: white;
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border-radius: 50%; animation: spin 0.8s linear infinite;
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display: none;
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}
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#floating-player-btn.loading #fp-loading-spinner { display: block; }
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#floating-player-btn.loading #fp-play-icon,
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#floating-player-btn.loading #fp-pause-icon,
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#floating-player-btn.loading #fp-start-text { display: none !important; }
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.reader-toast {
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position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
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background: rgba(30, 41, 59, 0.95); color: white;
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padding: 12px 24px; border-radius: 24px;
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font-family: "Inter", sans-serif; font-size: 0.9rem;
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box-shadow: 0 8px 24px rgba(0,0,0,0.2);
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z-index: 1100; opacity: 0; transition: opacity 0.3s;
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pointer-events: none; display: flex; align-items: center; gap: 8px;
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}
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.reader-toast.visible { opacity: 1; }
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.reader-toast .spinner {
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width: 14px; height: 14px;
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border: 2px solid rgba(255,255,255,0.3); border-top-color: white;
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border-radius: 50%; animation: spin 0.8s linear infinite;
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}
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/* Block highlight on outline click */
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.story-block.highlight-section,
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.story-image-block.highlight-section {
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animation: highlightPulse 2s ease-out;
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border-radius: 12px;
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}
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@keyframes highlightPulse {
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0% {
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background-color: rgba(79, 70, 229, 0.18);
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box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.25);
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}
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100% {
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background-color: transparent;
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box-shadow: 0 0 0 0 transparent;
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}
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}
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@media (max-width: 992px) {
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.reader-layout { flex-direction: column; }
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.document-outline { width: 100%; position: relative; top: 0; max-height: 300px; }
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}
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@media (max-width: 768px) {
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.main-content-card { padding: 1.5rem; }
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.story-text-container { font-size: 22px; line-height: 1.9; }
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#floating-player-btn {
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top: auto;
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bottom: 1rem;
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right: 1rem;
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height: 50px;
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min-width: 50px;
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}
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#floating-player-btn.active-mode { width: 50px; }
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}
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</style>
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</head>
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<body>
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<nav class="top-nav">
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<a href="/home" class="back-btn">
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<svg width="18" height="18" fill="currentColor" viewBox="0 0 16 16">
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<path d="M15 8a.5.5 0 0 0-.5-.5H2.707l3.147-3.146a.5.5 0 1 0-.708-.708l-4 4a.5.5 0 0 0 0 .708l4 4a.5.5 0 0 0 .708-.708L2.707 8.5H14.5A.5.5 0 0 0 15 8z"/>
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</svg>
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Back to Library
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</a>
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</nav>
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<button id="floating-player-btn">
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<svg id="fp-play-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M8 5v14l11-7z"/></svg>
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<svg id="fp-pause-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" style="display:none;"><path d="M6 19h4V5H6v14zm8-14v14h4V5h-4z"/></svg>
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<span id="fp-start-text">Start</span>
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<div id="fp-loading-spinner"></div>
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</button>
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<div id="reader-toast" class="reader-toast">
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<div class="spinner"></div>
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<span id="reader-toast-text">Loading…</span>
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</div>
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<div class="container-fluid my-4 px-md-5">
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<main id="main-content" class="main-content-card">
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<header class="text-center mb-5" id="main-header">
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<h1 class="story-title" id="book-title">Loading...</h1>
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<p class="story-subtitle" id="book-subtitle">Please wait</p>
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</header>
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<div class="reader-layout">
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<aside class="document-outline" id="story-nav" style="display: none;">
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<h6 class="outline-title">Table of Sections</h6>
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<ul class="outline-list" id="story-nav-list"></ul>
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</aside>
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<div class="reader-content-area">
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<div id="stories-main-container"></div>
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</div>
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</div>
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</main>
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</div>
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<script>
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/**
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* Public Reader — Smart Preload Architecture (v3)
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*
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* Loading Strategy:
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* 1. TEXT + TIMESTAMPS: loaded eagerly from /api/public/books/<id> in single batch.
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* 2. AUDIO: base64 → Blob URL conversion is DEFERRED until needed.
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* 3. Smart preload: when block N plays, preload blob URLs for N+1, N+2.
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* At 70% mark of N, ensure N+1 is ready (safety net).
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* 4. Memory cap: keep at most MAX_AUDIO_LOADED blob URLs alive;
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* revoke distant past audio to free browser memory.
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*
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* Scroll Strategy:
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* - Manual navigation (Start / outline click / word click): scroll to block.
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* - Auto-advance (audio ended → next): NO block scroll — word highlighter carries user.
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*/
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const pathParts = window.location.pathname.split('/');
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const BOOK_ID = parseInt(pathParts[pathParts.length - 1], 10);
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document.addEventListener("DOMContentLoaded", async () => {
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const mainContainer = document.getElementById("stories-main-container");
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const floatingPlayerBtn = document.getElementById("floating-player-btn");
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const storyNav = document.getElementById("story-nav");
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const storyNavList = document.getElementById("story-nav-list");
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const toastEl = document.getElementById("reader-toast");
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const toastText = document.getElementById("reader-toast-text");
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let storyInstances = [];
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let currentlyPlayingInstance = null;
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let currentlyPlayingIndex = -1;
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let hasStarted = false;
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let navObserver = null;
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// Tunables (matches reader_templates/index.html)
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const PRELOAD_AHEAD = 2;
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const MID_PRELOAD_THRESHOLD = 0.7;
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const MAX_AUDIO_LOADED = 5;
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const KEEP_BEHIND = 1;
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floatingPlayerBtn.addEventListener("click", handleFloatingBtnClick);
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mainContainer.addEventListener("click", handleTextClick);
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// ===================================================
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// UI Helpers
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// ===================================================
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function showToast(msg) { toastText.textContent = msg; toastEl.classList.add("visible"); }
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function hideToast() { toastEl.classList.remove("visible"); }
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function setButtonLoading(b) { floatingPlayerBtn.classList.toggle("loading", b); }
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function updateFloatingButton(state) {
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const fpPauseIcon = document.getElementById("fp-pause-icon");
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const fpPlayIcon = document.getElementById("fp-play-icon");
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if (hasStarted) {
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floatingPlayerBtn.classList.add("active-mode");
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}
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if (state === "playing") {
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fpPauseIcon.style.display = "block";
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fpPlayIcon.style.display = "none";
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} else {
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fpPauseIcon.style.display = "none";
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fpPlayIcon.style.display = "block";
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}
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}
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// ===================================================
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// INITIAL LOAD
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// ===================================================
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try {
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const resp = await fetch(`/api/public/books/${BOOK_ID}`);
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if (!resp.ok) throw new Error('Failed to load book');
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const book = await resp.json();
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document.getElementById("book-title").textContent = book.name;
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document.getElementById("book-subtitle").textContent = book.author ? `by ${book.author}` : 'An interactive audiobook';
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document.title = book.name + ' - Audiobook Reader';
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// Build flat list of blocks across chapters
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let globalIdx = 0;
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for (const chapter of book.chapters) {
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let firstInChapter = true;
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for (const block of chapter.blocks) {
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const isImage = block.block_type === 'image' ||
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(block.content && block.content.trim().startsWith(');
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if (isImage) {
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const imgBlockId = `img-block-${globalIdx}`;
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let imgHtml = `<div id="${imgBlockId}" class="story-image-block" data-chapter="${chapter.chapter_number}">`;
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if (block.images && block.images.length > 0) {
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for (const img of block.images) {
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if (img.data) {
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imgHtml += `<img src="data:image/${img.format};base64,${img.data}" alt="Image" loading="lazy">`;
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}
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}
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}
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imgHtml += '</div>';
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mainContainer.insertAdjacentHTML("beforeend", imgHtml);
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if (firstInChapter) addOutlineEntry(chapter.title, chapter.chapter_number, imgBlockId);
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firstInChapter = false;
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globalIdx++;
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continue;
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}
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if (!block.audio_data) continue;
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const blockId = `story-block-${globalIdx}`;
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if (firstInChapter) addOutlineEntry(chapter.title, chapter.chapter_number, blockId);
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firstInChapter = false;
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mainContainer.insertAdjacentHTML("beforeend", `
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<div id="${blockId}" class="story-block mt-4" data-instance-index="${storyInstances.length}" data-chapter="${chapter.chapter_number}">
|
||||
<article class="story-text-container"></article>
|
||||
<audio class="audio-player" preload="none" style="display:none;"></audio>
|
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</div>
|
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`);
|
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storyInstances.push({
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index: storyInstances.length,
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blockEl: document.getElementById(blockId),
|
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block: block,
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chapter: chapter,
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audio: null,
|
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audioUrl: null, // blob URL ref for cleanup
|
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audioReady: false,
|
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audioLoadingPromise: null,
|
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midPreloadTriggered: false,
|
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wordSpans: [],
|
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wordMap: [],
|
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sentenceData: [],
|
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animFrameId: null,
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lastWordSpan: null,
|
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lastSentenceSpans: []
|
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});
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|
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globalIdx++;
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}
|
||||
}
|
||||
|
||||
// Render text + sync for each instance (cheap, in-memory)
|
||||
for (const inst of storyInstances) {
|
||||
renderMarkdownInto(inst);
|
||||
smartSync(inst);
|
||||
}
|
||||
|
||||
storyNav.style.display = 'block';
|
||||
floatingPlayerBtn.classList.add("visible");
|
||||
setupNavObserver();
|
||||
|
||||
} catch (e) {
|
||||
console.error(e);
|
||||
mainContainer.innerHTML = `<p class="text-center text-danger">Error loading book: ${e.message}</p>`;
|
||||
}
|
||||
|
||||
// ===================================================
|
||||
// Outline / Navigation
|
||||
// ===================================================
|
||||
function addOutlineEntry(title, chapter, targetId) {
|
||||
const li = document.createElement("li");
|
||||
li.textContent = title;
|
||||
li.title = title;
|
||||
li.dataset.chapter = chapter;
|
||||
li.dataset.targetId = targetId;
|
||||
li.onclick = () => {
|
||||
const target = document.getElementById(targetId);
|
||||
if (!target) return;
|
||||
|
||||
const offset = target.getBoundingClientRect().top + window.pageYOffset - 80;
|
||||
window.scrollTo({ top: offset, behavior: 'smooth' });
|
||||
|
||||
target.classList.remove('highlight-section');
|
||||
void target.offsetWidth;
|
||||
target.classList.add('highlight-section');
|
||||
setTimeout(() => target.classList.remove('highlight-section'), 2000);
|
||||
|
||||
storyNavList.querySelectorAll('li').forEach(l => l.classList.remove('active'));
|
||||
li.classList.add('active');
|
||||
};
|
||||
storyNavList.appendChild(li);
|
||||
}
|
||||
|
||||
function setupNavObserver() {
|
||||
if (navObserver) navObserver.disconnect();
|
||||
navObserver = new IntersectionObserver((entries) => {
|
||||
entries.forEach(entry => {
|
||||
if (entry.isIntersecting) {
|
||||
const chapter = entry.target.dataset.chapter;
|
||||
if (chapter) {
|
||||
storyNavList.querySelectorAll('li').forEach(l => l.classList.remove('active'));
|
||||
const active = storyNavList.querySelector(`li[data-chapter='${chapter}']`);
|
||||
if (active) active.classList.add('active');
|
||||
}
|
||||
}
|
||||
});
|
||||
}, { threshold: 0.3, rootMargin: '-80px 0px -40% 0px' });
|
||||
|
||||
document.querySelectorAll('.story-block, .story-image-block').forEach(b => navObserver.observe(b));
|
||||
}
|
||||
|
||||
// ===================================================
|
||||
// Render & Sync
|
||||
// ===================================================
|
||||
function renderMarkdownInto(inst) {
|
||||
const container = inst.blockEl.querySelector(".story-text-container");
|
||||
container.innerHTML = "";
|
||||
inst.wordSpans = [];
|
||||
const div = document.createElement("div");
|
||||
div.innerHTML = marked.parse(inst.block.content, { breaks: true, gfm: true });
|
||||
|
||||
(function processNode(node) {
|
||||
if (node.nodeType === Node.TEXT_NODE) {
|
||||
const words = node.textContent.split(/(\s+)/);
|
||||
const frag = document.createDocumentFragment();
|
||||
words.forEach(part => {
|
||||
if (part.trim().length > 0) {
|
||||
const span = document.createElement("span");
|
||||
span.className = "word";
|
||||
span.textContent = part;
|
||||
inst.wordSpans.push(span);
|
||||
frag.appendChild(span);
|
||||
} else frag.appendChild(document.createTextNode(part));
|
||||
});
|
||||
node.parentNode.replaceChild(frag, node);
|
||||
} else if (node.nodeType === Node.ELEMENT_NODE) {
|
||||
Array.from(node.childNodes).forEach(processNode);
|
||||
}
|
||||
})(div);
|
||||
|
||||
while (div.firstChild) container.appendChild(div.firstChild);
|
||||
}
|
||||
|
||||
function smartSync(inst) {
|
||||
const transcription = inst.block.transcription || [];
|
||||
inst.wordMap = new Array(inst.wordSpans.length).fill(undefined);
|
||||
let ai = 0;
|
||||
inst.wordSpans.forEach((span, i) => {
|
||||
const tw = span.textContent.toLowerCase().replace(/[^\w]/g, "");
|
||||
for (let o = 0; o < 5; o++) {
|
||||
if (ai + o >= transcription.length) break;
|
||||
const aw = transcription[ai + o].word.toLowerCase().replace(/[^\w]/g, "");
|
||||
if (tw === aw) { inst.wordMap[i] = ai + o; ai += o + 1; return; }
|
||||
}
|
||||
});
|
||||
|
||||
inst.sentenceData = [];
|
||||
let buf = [], si = 0;
|
||||
inst.wordSpans.forEach((s, i) => {
|
||||
buf.push(s);
|
||||
if (/[.!?]["'\u201D\u2019]?$/.test(s.textContent.trim())) {
|
||||
let sT = 0, eT = 0;
|
||||
for (let k = si; k <= i; k++) if (inst.wordMap[k] !== undefined) { sT = transcription[inst.wordMap[k]].start; break; }
|
||||
for (let k = i; k >= si; k--) if (inst.wordMap[k] !== undefined) { eT = transcription[inst.wordMap[k]].end; break; }
|
||||
if (eT > sT) inst.sentenceData.push({ spans: [...buf], startTime: sT, endTime: eT });
|
||||
buf = []; si = i + 1;
|
||||
}
|
||||
});
|
||||
if (buf.length > 0) {
|
||||
let sT = 0, eT = 0;
|
||||
for (let k = si; k < inst.wordSpans.length; k++) if (inst.wordMap[k] !== undefined) { sT = transcription[inst.wordMap[k]].start; break; }
|
||||
for (let k = inst.wordSpans.length - 1; k >= si; k--) if (inst.wordMap[k] !== undefined) { eT = transcription[inst.wordMap[k]].end; break; }
|
||||
if (eT > sT) inst.sentenceData.push({ spans: [...buf], startTime: sT, endTime: eT });
|
||||
}
|
||||
}
|
||||
|
||||
// ===================================================
|
||||
// AUDIO LAZY LOADING + MEMORY MANAGEMENT
|
||||
// ===================================================
|
||||
function ensureAudioLoaded(inst) {
|
||||
if (inst.audioReady && inst.audio) return Promise.resolve(inst);
|
||||
if (inst.audioLoadingPromise) return inst.audioLoadingPromise;
|
||||
|
||||
inst.audioLoadingPromise = new Promise((resolve, reject) => {
|
||||
if (!inst.block.audio_data) {
|
||||
inst.audioLoadingPromise = null;
|
||||
return reject(new Error('No audio data'));
|
||||
}
|
||||
|
||||
try {
|
||||
const audio = inst.blockEl.querySelector('.audio-player');
|
||||
const blob = base64ToBlob(inst.block.audio_data, `audio/${inst.block.audio_format || 'mp3'}`);
|
||||
const url = URL.createObjectURL(blob);
|
||||
|
||||
const onCanPlay = () => {
|
||||
audio.removeEventListener('error', onError);
|
||||
inst.audio = audio;
|
||||
inst.audioUrl = url;
|
||||
inst.audioReady = true;
|
||||
wireAudioEvents(inst);
|
||||
resolve(inst);
|
||||
};
|
||||
const onError = () => {
|
||||
audio.removeEventListener('canplay', onCanPlay);
|
||||
try { URL.revokeObjectURL(url); } catch (e) {}
|
||||
inst.audioLoadingPromise = null;
|
||||
reject(new Error('Audio failed to load'));
|
||||
};
|
||||
|
||||
audio.addEventListener('canplay', onCanPlay, { once: true });
|
||||
audio.addEventListener('error', onError, { once: true });
|
||||
|
||||
audio.preload = 'auto';
|
||||
audio.src = url;
|
||||
audio.load();
|
||||
} catch (err) {
|
||||
inst.audioLoadingPromise = null;
|
||||
reject(err);
|
||||
}
|
||||
});
|
||||
return inst.audioLoadingPromise;
|
||||
}
|
||||
|
||||
function wireAudioEvents(inst) {
|
||||
const audio = inst.audio;
|
||||
|
||||
audio.addEventListener('play', () => {
|
||||
startHighlightLoop(inst);
|
||||
updateFloatingButton('playing');
|
||||
});
|
||||
audio.addEventListener('pause', () => {
|
||||
stopHighlightLoop(inst);
|
||||
updateFloatingButton('paused');
|
||||
});
|
||||
audio.addEventListener('ended', () => {
|
||||
stopHighlightLoop(inst);
|
||||
clearHighlights(inst);
|
||||
const nextIdx = inst.index + 1;
|
||||
if (nextIdx < storyInstances.length) {
|
||||
playInstance(nextIdx, 0, { autoAdvance: true });
|
||||
} else {
|
||||
currentlyPlayingInstance = null;
|
||||
currentlyPlayingIndex = -1;
|
||||
updateFloatingButton('paused');
|
||||
}
|
||||
});
|
||||
// Mid-play safety net
|
||||
audio.addEventListener('timeupdate', () => {
|
||||
if (inst.midPreloadTriggered) return;
|
||||
if (!audio.duration || isNaN(audio.duration)) return;
|
||||
if ((audio.currentTime / audio.duration) >= MID_PRELOAD_THRESHOLD) {
|
||||
inst.midPreloadTriggered = true;
|
||||
const nextIdx = inst.index + 1;
|
||||
if (nextIdx < storyInstances.length) {
|
||||
ensureAudioLoaded(storyInstances[nextIdx]).catch(() => {});
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Preload N audio blocks ahead (fire-and-forget).
|
||||
*/
|
||||
function preloadAhead(fromIndex) {
|
||||
for (let i = 1; i <= PRELOAD_AHEAD; i++) {
|
||||
const idx = fromIndex + i;
|
||||
if (idx >= storyInstances.length) break;
|
||||
ensureAudioLoaded(storyInstances[idx]).catch(() => {});
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Memory management: keep only sliding window of audio elements loaded.
|
||||
* Window = [currentIndex - KEEP_BEHIND, currentIndex + PRELOAD_AHEAD]
|
||||
* Bounded to MAX_AUDIO_LOADED total.
|
||||
*/
|
||||
function pruneLoadedAudio(currentIndex) {
|
||||
const loaded = storyInstances.filter(i => i.audioReady && i.audio && i.audioUrl);
|
||||
if (loaded.length <= MAX_AUDIO_LOADED) return;
|
||||
|
||||
const keepLow = currentIndex - KEEP_BEHIND;
|
||||
const keepHigh = currentIndex + PRELOAD_AHEAD;
|
||||
|
||||
const candidates = loaded
|
||||
.filter(inst => inst !== currentlyPlayingInstance)
|
||||
.map(inst => ({
|
||||
inst,
|
||||
inWindow: inst.index >= keepLow && inst.index <= keepHigh,
|
||||
distance: Math.abs(inst.index - currentIndex)
|
||||
}))
|
||||
.sort((a, b) => {
|
||||
if (a.inWindow !== b.inWindow) return a.inWindow ? 1 : -1;
|
||||
return b.distance - a.distance;
|
||||
});
|
||||
|
||||
let toEvict = loaded.length - MAX_AUDIO_LOADED;
|
||||
for (const c of candidates) {
|
||||
if (toEvict <= 0) break;
|
||||
releaseAudio(c.inst);
|
||||
toEvict--;
|
||||
}
|
||||
}
|
||||
|
||||
function releaseAudio(inst) {
|
||||
if (!inst.audio) return;
|
||||
try {
|
||||
inst.audio.pause();
|
||||
inst.audio.removeAttribute('src');
|
||||
inst.audio.load();
|
||||
} catch (e) { /* ignore */ }
|
||||
if (inst.audioUrl) {
|
||||
try { URL.revokeObjectURL(inst.audioUrl); } catch (e) {}
|
||||
inst.audioUrl = null;
|
||||
}
|
||||
inst.audioReady = false;
|
||||
inst.audioLoadingPromise = null;
|
||||
inst.midPreloadTriggered = false;
|
||||
}
|
||||
|
||||
// ===================================================
|
||||
// PLAYBACK
|
||||
// ===================================================
|
||||
async function playInstance(idx, ts = 0, opts = {}) {
|
||||
if (idx < 0 || idx >= storyInstances.length) return;
|
||||
const inst = storyInstances[idx];
|
||||
const isAutoAdvance = opts.autoAdvance === true;
|
||||
|
||||
if (currentlyPlayingInstance && currentlyPlayingInstance !== inst) {
|
||||
stopAndResetInstance(currentlyPlayingInstance);
|
||||
}
|
||||
currentlyPlayingInstance = inst;
|
||||
currentlyPlayingIndex = idx;
|
||||
hasStarted = true;
|
||||
inst.midPreloadTriggered = false;
|
||||
|
||||
const needsLoad = !inst.audioReady;
|
||||
if (needsLoad) {
|
||||
setButtonLoading(true);
|
||||
showToast("Loading audio…");
|
||||
}
|
||||
|
||||
try {
|
||||
await ensureAudioLoaded(inst);
|
||||
|
||||
if (needsLoad) {
|
||||
hideToast();
|
||||
setButtonLoading(false);
|
||||
}
|
||||
|
||||
inst.audio.currentTime = ts;
|
||||
await inst.audio.play();
|
||||
updateFloatingButton('playing');
|
||||
|
||||
// Block-level scroll ONLY for manual navigation
|
||||
if (!isAutoAdvance) {
|
||||
const rect = inst.blockEl.getBoundingClientRect();
|
||||
if (rect.top < 0 || rect.top > window.innerHeight * 0.6) {
|
||||
inst.blockEl.scrollIntoView({ behavior: 'smooth', block: 'start' });
|
||||
}
|
||||
}
|
||||
|
||||
preloadAhead(idx);
|
||||
pruneLoadedAudio(idx);
|
||||
} catch (err) {
|
||||
console.error(err);
|
||||
setButtonLoading(false);
|
||||
showToast("Failed to load audio. Tap again to retry.");
|
||||
setTimeout(hideToast, 3000);
|
||||
updateFloatingButton('paused');
|
||||
}
|
||||
}
|
||||
|
||||
function stopAndResetInstance(inst) {
|
||||
if (inst.audio) {
|
||||
try {
|
||||
inst.audio.pause();
|
||||
inst.audio.currentTime = 0;
|
||||
} catch (e) {}
|
||||
}
|
||||
stopHighlightLoop(inst);
|
||||
clearHighlights(inst);
|
||||
}
|
||||
|
||||
function handleFloatingBtnClick() {
|
||||
if (!hasStarted) { playInstance(0, 0); return; }
|
||||
if (currentlyPlayingInstance && currentlyPlayingInstance.audio) {
|
||||
const audio = currentlyPlayingInstance.audio;
|
||||
if (audio.paused) {
|
||||
audio.play().catch(console.error);
|
||||
updateFloatingButton('playing');
|
||||
} else {
|
||||
audio.pause();
|
||||
updateFloatingButton('paused');
|
||||
}
|
||||
} else {
|
||||
playInstance(0, 0);
|
||||
}
|
||||
}
|
||||
|
||||
function handleTextClick(e) {
|
||||
const wordSpan = e.target.closest('.word');
|
||||
if (!wordSpan) return;
|
||||
const block = e.target.closest('.story-block');
|
||||
if (!block) return;
|
||||
const idx = parseInt(block.dataset.instanceIndex, 10);
|
||||
const inst = storyInstances[idx];
|
||||
if (!inst) return;
|
||||
const wordIdx = inst.wordSpans.indexOf(wordSpan);
|
||||
const aiIdx = inst.wordMap[wordIdx];
|
||||
if (aiIdx === undefined) return;
|
||||
playInstance(idx, inst.block.transcription[aiIdx].start);
|
||||
}
|
||||
|
||||
// ===================================================
|
||||
// Highlighting
|
||||
// ===================================================
|
||||
function startHighlightLoop(inst) {
|
||||
cancelAnimationFrame(inst.animFrameId);
|
||||
inst.animFrameId = requestAnimationFrame(() => highlightLoop(inst));
|
||||
}
|
||||
function stopHighlightLoop(inst) { cancelAnimationFrame(inst.animFrameId); }
|
||||
|
||||
function highlightLoop(inst) {
|
||||
if (!inst.audio || inst.audio.paused) return;
|
||||
const t = inst.audio.currentTime;
|
||||
const transcription = inst.block.transcription || [];
|
||||
const ai = transcription.findIndex(w => t >= w.start && t < w.end);
|
||||
if (ai !== -1) {
|
||||
const ti = inst.wordMap.findIndex(i => i === ai);
|
||||
if (ti !== -1) {
|
||||
const sp = inst.wordSpans[ti];
|
||||
if (sp !== inst.lastWordSpan) {
|
||||
if (inst.lastWordSpan) inst.lastWordSpan.classList.remove('current-word');
|
||||
sp.classList.add('current-word');
|
||||
const r = sp.getBoundingClientRect();
|
||||
if (r.top < window.innerHeight * 0.2 || r.bottom > window.innerHeight * 0.8) {
|
||||
sp.scrollIntoView({ behavior: 'smooth', block: 'center' });
|
||||
}
|
||||
inst.lastWordSpan = sp;
|
||||
}
|
||||
}
|
||||
}
|
||||
const sent = inst.sentenceData.find(s => t >= s.startTime && t <= s.endTime);
|
||||
if (sent && sent.spans !== inst.lastSentenceSpans) {
|
||||
inst.lastSentenceSpans.forEach(s => s.classList.remove('current-sentence-bg'));
|
||||
sent.spans.forEach(s => s.classList.add('current-sentence-bg'));
|
||||
inst.lastSentenceSpans = sent.spans;
|
||||
}
|
||||
inst.animFrameId = requestAnimationFrame(() => highlightLoop(inst));
|
||||
}
|
||||
|
||||
function clearHighlights(inst) {
|
||||
if (inst.lastWordSpan) inst.lastWordSpan.classList.remove('current-word');
|
||||
inst.lastSentenceSpans.forEach(s => s.classList.remove('current-sentence-bg'));
|
||||
inst.lastWordSpan = null;
|
||||
inst.lastSentenceSpans = [];
|
||||
}
|
||||
|
||||
// ===================================================
|
||||
// Utility
|
||||
// ===================================================
|
||||
function base64ToBlob(b64, mime) {
|
||||
const bin = atob(b64);
|
||||
const arr = new Uint8Array(bin.length);
|
||||
for (let i = 0; i < bin.length; i++) arr[i] = bin.charCodeAt(i);
|
||||
return new Blob([arr], { type: mime });
|
||||
}
|
||||
});
|
||||
</script>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user