将视频字幕嵌入

public/css/style.css

@@ -647,6 +647,50 @@ header p {
     margin-bottom: 0.5rem;
 }
 
+.now-playing-actions {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+    margin-top: 1rem;
+    flex-wrap: wrap;
+}
+
+.subtitle-panel {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    background: var(--panel-bg);
+    border: 1px solid var(--panel-border);
+    padding: 0.5rem 0.8rem;
+    border-radius: 12px;
+}
+
+.subtitle-panel label {
+    font-size: 0.85rem;
+    font-weight: 600;
+    color: var(--text-secondary);
+    white-space: nowrap;
+    margin: 0;
+    text-transform: none;
+    letter-spacing: normal;
+}
+
+.subtitle-panel select {
+    background: transparent;
+    border: none;
+    color: var(--text-primary);
+    font-size: 0.9rem;
+    font-weight: 600;
+    outline: none;
+    cursor: pointer;
+    min-width: 100px;
+}
+
+.subtitle-panel select option {
+    background: var(--bg-dark);
+    color: var(--text-primary);
+}
+
 .now-playing p {
     font-size: 1.25rem;
     font-weight: 600;

public/index.html

@@ -140,6 +140,12 @@
                     <h3>Now Playing</h3>
                     <p id="current-video-title">video.mp4</p>
                     <div class="now-playing-actions">
+                        <div id="subtitle-panel" class="subtitle-panel hidden">
+                            <label for="subtitle-selector">字幕：</label>
+                            <select id="subtitle-selector">
+                                <option value="-1">无字幕</option>
+                            </select>
+                        </div>
                         <button id="transcode-btn" class="play-btn hidden">开始播放</button>
                         <button id="stop-transcode-btn" class="play-btn stop-btn hidden">停止播放</button>
                         <button id="clear-playing-download-cache-btn" class="play-btn stop-btn hidden">清空下载缓存</button>

public/js/main.js

@@ -23,6 +23,8 @@ document.addEventListener('DOMContentLoaded', () => {
     const themeSelector = document.getElementById('theme-selector');
     const videoListHeader = document.getElementById('video-list-header');
     const logoutBtn = document.getElementById('logout-btn');
+    const subtitlePanel = document.getElementById('subtitle-panel');
+    const subtitleSelector = document.getElementById('subtitle-selector');
     const topBannerTitle = document.getElementById('top-banner-title');
     const playBtn = document.getElementById('play-btn');
     const topBanner = document.getElementById('top-banner');
@@ -143,6 +145,12 @@ document.addEventListener('DOMContentLoaded', () => {
         const decoder = 'auto';
         const encoder = encoderSelect?.value || 'h264_rkmpp';
         let streamUrl = `/api/hls/playlist.m3u8?bucket=${encodeURIComponent(selectedBucket)}&key=${encodeURIComponent(selectedKey)}&decoder=${encodeURIComponent(decoder)}&encoder=${encodeURIComponent(encoder)}`;
+        
+        const subIndex = subtitleSelector?.value;
+        if (subIndex && subIndex !== '-1') {
+            streamUrl += `&subtitleIndex=${encodeURIComponent(subIndex)}`;
+        }
+
         const sessionId = localStorage.getItem('sessionId');
         if (sessionId) {
             streamUrl += `&sessionId=${encodeURIComponent(sessionId)}`;
@@ -265,16 +273,22 @@ document.addEventListener('DOMContentLoaded', () => {
     };
 
     const subscribeToKey = (key) => {
-        subscribedKey = key;
+        let subscriptionKey = key;
+        const subIndex = subtitleSelector?.value;
+        if (subIndex && subIndex !== '-1') {
+            subscriptionKey = `${key}-sub${subIndex}`;
+        }
+        
+        subscribedKey = subscriptionKey;
         if (wsConnected) {
-            sendWsMessage({ type: 'subscribe', key });
+            sendWsMessage({ type: 'subscribe', key: subscriptionKey });
         }
     };
 
     const handleWsMessage = (event) => {
         try {
             const message = JSON.parse(event.data);
-            if (message.key !== currentVideoKey) return;
+            if (message.key !== subscribedKey) return;
 
             if (message.type === 'duration' && message.duration) {
                 videoDuration = message.duration;
@@ -891,6 +905,51 @@ document.addEventListener('DOMContentLoaded', () => {
 
         nowPlaying.classList.remove('hidden');
         currentVideoTitle.textContent = key.split('/').pop();
+
+        // Fetch subtitle metadata
+        fetchVideoMetadata(selectedBucket, key);
+    };
+
+    const handleSubtitleChange = () => {
+        if (!selectedKey) return;
+        subscribeToKey(selectedKey);
+    };
+    if (subtitleSelector) {
+        subtitleSelector.addEventListener('change', handleSubtitleChange);
+    }
+
+    const fetchVideoMetadata = async (bucket, key) => {
+        if (!subtitlePanel || !subtitleSelector) return;
+        
+        subtitlePanel.classList.add('hidden');
+        subtitleSelector.innerHTML = '<option value="-1">正在加载字幕...</option>';
+        subtitleSelector.disabled = true;
+
+        try {
+            const res = await fetch(`/api/video-metadata?bucket=${encodeURIComponent(bucket)}&key=${encodeURIComponent(key)}`, { headers: s3AuthHeaders });
+            if (!res.ok) throw new Error('Failed to fetch metadata');
+            const data = await res.json();
+            
+            subtitleSelector.innerHTML = '<option value="-1">无字幕</option>';
+            if (data.subtitleStreams && data.subtitleStreams.length > 0) {
+                data.subtitleStreams.forEach(sub => {
+                    const option = document.createElement('option');
+                    option.value = sub.subIndex;
+                    option.textContent = `[${sub.language}] ${sub.title}`;
+                    subtitleSelector.appendChild(option);
+                });
+                subtitlePanel.classList.remove('hidden');
+            } else {
+                subtitleSelector.innerHTML = '<option value="-1">无嵌入字幕</option>';
+                subtitlePanel.classList.remove('hidden');
+            }
+        } catch (err) {
+            console.error('Fetch metadata failed:', err);
+            subtitleSelector.innerHTML = '<option value="-1">无法加载字幕</option>';
+            subtitlePanel.classList.remove('hidden');
+        } finally {
+            subtitleSelector.disabled = false;
+        }
     };
 
     const startTranscode = async () => {