现在的问题比较大，因为metadata的引入导致原有的部分播放进度信息推送错误

lib/services/audio_player_handler.dart

@@ -39,6 +39,7 @@ class AudioPlayerHandler extends audio_service.BaseAudioHandler {
     });
 
     _player.durationStream.listen((duration) {
+      debugPrint('🎯 [durationStream] duration=$duration');
       _state.updateDuration(duration);
       if (_currentId != null && _currentTitle != null) {
         _updateMediaItem(

lib/services/audio_service.dart

@@ -3,7 +3,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:media_kit/media_kit.dart';
 import 'playback_service.dart';
-import '../metadata/metadata_service.dart'; // ⭐ 新增
+import '../metadata/metadata_service.dart';
 
 enum PlayMode {
   sequential,
@@ -30,7 +30,7 @@ class AudioService extends ChangeNotifier {
   factory AudioService() => _instance;
   AudioService._internal();
 
-  // ---- 基础状态（低频，触发 UI 重建） ----
+  // ---- 基础状态 ----
   Song? _currentSong;
   bool _isPlaying = false;
   PlayMode _playMode = PlayMode.sequential;
@@ -41,7 +41,7 @@ class AudioService extends ChangeNotifier {
   List<int> _shuffledIndices = [];
   int _shuffledIndex = -1;
 
-  // ---- ⭐ 高频进度（用 ValueNotifier，不触发全局重建） ----
+  // ---- 高频进度 ----
   final ValueNotifier<Duration> positionNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> durationNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> bufferedNotifier = ValueNotifier(Duration.zero);
@@ -49,13 +49,10 @@ class AudioService extends ChangeNotifier {
   bool _listening = false;
   final List<StreamSubscription> _subscriptions = [];
 
-  // ⭐ 防重入标志
   bool _handlingCompletion = false;
-
-  // ⭐ 歌曲切换回调（用于通知 Handler 更新 MediaItem）
   void Function(Song)? _onSongChanged;
 
-  // ---- Getter（高频字段不走 ChangeNotifier） ----
+  // ---- Getter ----
   Song? get currentSong => _currentSong;
   bool get isPlaying => _isPlaying;
   PlayMode get playMode => _playMode;
@@ -63,7 +60,6 @@ class AudioService extends ChangeNotifier {
   int get currentIndex => _currentIndex;
   bool get hasQueue => _queue.isNotEmpty;
 
-  // ---- 兼容旧代码：提供 getter 返回 ValueNotifier 的值 ----
   Duration get position => positionNotifier.value;
   Duration get duration => durationNotifier.value;
   Duration get bufferedPosition => bufferedNotifier.value;
@@ -79,12 +75,10 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 注册歌曲切换回调 ----
   void setOnSongChanged(void Function(Song) callback) {
     _onSongChanged = callback;
   }
 
-  // ---- 切换播放模式 ----
   void togglePlayMode() {
     switch (_playMode) {
       case PlayMode.sequential:
@@ -100,7 +94,6 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 设置播放队列 ----
   void setQueue(List<Song> queue, {int startIndex = 0}) {
     if (queue.isEmpty) {
       _clearQueue();
@@ -129,7 +122,6 @@ class AudioService extends ChangeNotifier {
     stopPlay();
   }
 
-  // ---- 播放指定歌曲 ----
   Future<void> playSong(Song song) async {
     if (_queue.isEmpty || _queue[_currentIndex].id != song.id) {
       setQueue([song], startIndex: 0);
@@ -138,6 +130,9 @@ class AudioService extends ChangeNotifier {
     }
   }
 
+  // ============================================================
+  // 核心播放逻辑
+  // ============================================================
   void _playCurrent() {
     if (_currentIndex < 0 || _currentIndex >= _queue.length) {
       stopPlay();
@@ -147,13 +142,8 @@ class AudioService extends ChangeNotifier {
     final song = _queue[_currentIndex];
     _currentSong = song;
 
-    // ⭐ 切歌时触发回调（通知 Handler 更新 MediaItem）
-    _onSongChanged?.call(song);
-
-    // ⭐ 重置进度（用 ValueNotifier）
-    positionNotifier.value = Duration.zero;
-    durationNotifier.value = Duration.zero;
-    bufferedNotifier.value = Duration.zero;
+    // ⭐ 不重置任何 Notifier，完全依赖 stream 推送
+    // position / duration / buffered 由播放器自然更新
 
     _startListening();
     notifyListeners();
@@ -164,27 +154,27 @@ class AudioService extends ChangeNotifier {
 
     PlaybackService().play(song.url!);
 
-    // ⭐ 异步加载 metadata（不阻塞播放）
+    // ⭐ 兜底：主动同步一次播放器状态（解决首次加载时 stream 未推送的问题）
+    _syncPlayerStateDelayed();
+
     _loadMetadataForCurrentSong();
   }
 
-  // ⭐ 新增：加载当前歌曲的 metadata
+  // ============================================================
+  // Metadata 加载
+  // ============================================================
   Future<void> _loadMetadataForCurrentSong() async {
     if (_currentIndex < 0 || _currentIndex >= _queue.length) return;
-
     final song = _queue[_currentIndex];
     if (song.url == null || song.url!.isEmpty) return;
 
     try {
-      // 注意：filePath 需要是本地文件路径
-      // WebDAV 文件可能需要先缓存到本地
       final metadata = await MetadataService().getMetadata(
-        filePath: song.url!,
+        url: song.url!,
         fileName: song.title,
         fileId: song.id,
       );
 
-      // 如果 metadata 有效且与当前不同，更新 Song
       if (metadata.isNotEmpty) {
         final updatedSong = Song(
           id: song.id,
@@ -198,12 +188,13 @@ class AudioService extends ChangeNotifier {
         _onSongChanged?.call(updatedSong);
       }
     } catch (e) {
-      // 读取失败，保持原有信息
       debugPrint('⚠️ [AudioService] metadata load failed: $e');
     }
   }
 
-  // ---- 下一首 ----
+  // ============================================================
+  // 播放控制
+  // ============================================================
   void next() {
     if (_queue.isEmpty) return;
 
@@ -221,7 +212,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 上一首 ----
   void previous() {
     if (_queue.isEmpty) return;
 
@@ -247,7 +237,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 播放/暂停 ----
   void togglePlay() {
     if (_currentSong == null) return;
 
@@ -282,7 +271,38 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 监听 media_kit 状态 ----
+  // ============================================================
+  // 播放器状态同步（兜底机制）
+  // ============================================================
+  void _syncPlayerStateDelayed() {
+    _syncPlayerStateNow();
+    Future.delayed(const Duration(milliseconds: 200), () {
+      _syncPlayerStateNow();
+    });
+    Future.delayed(const Duration(milliseconds: 500), () {
+      _syncPlayerStateNow();
+    });
+  }
+
+  void _syncPlayerStateNow() {
+    final player = PlaybackService().player;
+    final dur = player.state.duration;
+    final buf = player.state.buffer;
+
+    if (dur.inMilliseconds > 0 && durationNotifier.value.inMilliseconds == 0) {
+      durationNotifier.value = dur;
+      debugPrint('🎯 [AudioService] sync duration: $dur');
+    }
+
+    if (buf.inMilliseconds > 0 && bufferedNotifier.value.inMilliseconds == 0) {
+      bufferedNotifier.value = buf;
+      debugPrint('🎯 [AudioService] sync buffer: $buf');
+    }
+  }
+
+  // ============================================================
+  // media_kit 状态监听
+  // ============================================================
   void _startListening() {
     if (_listening) return;
     _listening = true;
@@ -306,7 +326,11 @@ class AudioService extends ChangeNotifier {
 
     _subscriptions.add(
       player.stream.duration.listen((duration) {
-        durationNotifier.value = duration;
+        debugPrint('🎯 [AudioService] durationStream: $duration');
+        // 只接受 > 0 的值，避免 0 覆盖正确值
+        if (duration.inMilliseconds > 0) {
+          durationNotifier.value = duration;
+        }
       }),
     );
 
@@ -331,7 +355,9 @@ class AudioService extends ChangeNotifier {
     _subscriptions.clear();
   }
 
-  // ⭐ 防重入的完成事件处理
+  // ============================================================
+  // 播放完成处理
+  // ============================================================
   void _onPlaybackCompleted() {
     if (_handlingCompletion) {
       debugPrint('⚠️ [service] completed ignored: already handling');