show snapshot of first video file for video directories

lib/DirScanner.php

@@ -815,22 +815,19 @@ Class DirScanner {
             RecursiveIteratorIterator::SELF_FIRST
         );
 
-        $imgUrl = '';
+        $imgData = null;
         foreach ($iterator as $item) {
             if ($item->isFile()) {
                 $extension = $item->getExtension();
                 if (in_array(strtolower($extension), $imgExts)) {
                     $imgPath = $item->getPath() . '/' . $item->getFilename();
                     $imgData = $this->getFileData($imgPath);
-                    if (!empty($imgData['path'])) {
-                        $imgUrl = $imgData['path'];
-                    }
                     break;
                 }
             }
         }
 
-        return $imgUrl;
+        return $imgData;
     }
 
 }

themes/beauty/controller/SiteController.php

@@ -187,16 +187,28 @@ Class SiteController extends Controller {
                 $scanner->setRootDir($realpath);
 
                 $imgExts = !empty(FSC::$app['config']['supportedImageExts']) ? FSC::$app['config']['supportedImageExts'] : array('jpg', 'jpeg', 'png', 'webp', 'gif');
-                $url = $scanner->getSnapshotImage($realpath, $imgExts);
+                $imgFile = $scanner->getSnapshotImage($realpath, $imgExts);
+
                 
                 //支持视频目录
-                if (empty($url)) {
+                if (empty($imgFile)) {
                     $videoExts = !empty(FSC::$app['config']['supportedVideoExts']) ? FSC::$app['config']['supportedVideoExts'] : array('mp4', 'mov', 'm3u8');
-                    $firstVideoPath = $scanner->getSnapshotImage($realpath, $videoExts);
-                    if (!empty($firstVideoPath)) {
+                    $firstVideo = $scanner->getSnapshotImage($realpath, $videoExts);
+                    if (!empty($firstVideo)) {
                         $url = '/img/beauty/video_dir.png';
+
+                        //尝试从缓存数据中获取封面图
+                        $cacheKey = $firstVideo['id'];
+                        $expireSeconds = 86400*30;  //有效期30天
+                        $cacheSubDir = 'video';
+                        $cachedData = Common::getCacheFromFile($cacheKey, $expireSeconds, $cacheSubDir);
+                        if (!empty($cachedData)) {
+                            $url = $cachedData['snapshot'];
                         }
                     }
+                }else {
+                    $url = $imgFile['path'];
+                }
             }else {
                 $code = 0;
                 $msg = '缓存数据已失效，请刷新网页';