fix(player): preserve default codec preferences after upgrade (#2444)

* fix(player): preserve default codec preferences after upgrade

* update

---------

Co-authored-by: dom <githubaccount56556@proton.me>

lib/pages/setting/models/video_settings.dart

@@ -127,10 +127,8 @@ List<SettingsModel> get videoSettings => [
   NormalModel(
     title: '首选解码格式',
     leading: const Icon(Icons.movie_creation_outlined),
-    getSubtitle: () {
-      final list = Pref.preferCodecs;
-      return '首选解码格式：${(list.isEmpty ? '第一个可用' : list.map((i) => i.name).join(","))}，请根据设备支持情况与需求调整';
-    },
+    getSubtitle: () =>
+        '首选解码格式：${(Pref.preferCodecs.map((i) => i.name).join(","))}，请根据设备支持情况与需求调整',
     onTap: _showCodecsDialog,
   ),
   if (kDebugMode || Platform.isAndroid)
@@ -356,13 +354,11 @@ Future<void> _showCodecsDialog(
       values: {for (final e in VideoDecodeFormatType.values) e: e.name},
     ),
   );
-  if (res != null) {
-    await (res.isEmpty
-        ? GStorage.setting.delete(SettingBoxKey.preferCodecs)
-        : GStorage.setting.put(
-            SettingBoxKey.preferCodecs,
-            res.map((i) => i.name).toList(),
-          ));
+  if (res != null && res.isNotEmpty) {
+    await GStorage.setting.put(
+      SettingBoxKey.preferCodecs,
+      res.map((i) => i.name).toList(),
+    );
     setState();
   }
 }

lib/utils/storage_pref.dart

@@ -267,10 +267,10 @@ abstract final class Pref {
     }
 
     final codecs = _setting.get(SettingBoxKey.preferCodecs);
-    if (codecs is List && codecs.isNotEmpty) {
+    if (codecs is List) {
       return codecs.map((i) => VideoDecodeFormatType.values.byName(i)).toList();
     }
-    return const [];
+    return const <VideoDecodeFormatType>[.AVC, .AV1];
   }
 
   static String get hardwareDecoding => _setting.get(