Merge branch 'test'

lib/audio/player_controller.dart

@@ -1,5 +1,4 @@
 // lib/audio/player_controller.dart
-import 'package:media_kit/media_kit.dart';
 import '../services/playback_service.dart'; // ⭐ 修正路径
 
 class PlayerController {

lib/metadata/file_provider.dart

@@ -0,0 +1,28 @@
+// lib/metadata/file_provider.dart
+import 'dart:io';
+
+abstract class FileProvider {
+  /// 获取文件，如果是远程文件则先下载到本地缓存
+  Future<File?> getFile(String url);
+}
+
+class LocalFileProvider implements FileProvider {
+  @override
+  Future<File?> getFile(String url) async {
+    final file = File(url);
+    if (await file.exists()) {
+      return file;
+    }
+    return null;
+  }
+}
+
+class WebDAVFileProvider implements FileProvider {
+  @override
+  Future<File?> getFile(String url) async {
+    // 🔴 第一阶段：先不实现下载，返回 null
+    // 这样 WebDAV 文件会 fallback 到文件名
+    // 等核心播放逻辑稳定后，再实现真正的下载缓存
+    return null;
+  }
+}

lib/metadata/metadata_cache.dart

@@ -0,0 +1,27 @@
+// lib/metadata/metadata_cache.dart
+import 'metadata_model.dart';
+
+class MetadataCache {
+  final Map<String, FinalMetadata> _cache = {};
+
+  Future<FinalMetadata?> get(String fileId) async {
+    return _cache[fileId];
+  }
+
+  Future<void> put(String fileId, FinalMetadata metadata) async {
+    _cache[fileId] = metadata;
+  }
+
+  Future<void> update(String fileId, FinalMetadata metadata) async {
+    _cache[fileId] = metadata;
+  }
+
+  Future<List<Map<String, dynamic>>> getHistory(String artist,
+      {int limit = 10}) async {
+    return [];
+  }
+
+  Future<void> clear() async {
+    _cache.clear();
+  }
+}

lib/metadata/metadata_constants.dart

@@ -0,0 +1,16 @@
+// lib/metadata/metadata_constants.dart
+class MetadataConstants {
+  /// 首次 metadata 触发延迟（播放开始后等待时间）
+  static const Duration initialTriggerDelay = Duration(seconds: 20);
+
+  /// 重新确认进度点
+  static const double recheckProgress75 = 0.75;
+
+  static const double recheckProgress100 = 1.0;
+
+  /// 置信度阈值
+  static const double confidenceThreshold = 0.6;
+
+  /// 最小历史证据数量
+  static const int minHistoryCount = 4;
+}

lib/metadata/metadata_model.dart

@@ -0,0 +1,143 @@
+// lib/metadata/metadata_model.dart
+import 'dart:typed_data';
+
+/// 从音频文件读取的原始元数据
+class RawMetadata {
+  final String title;
+  final String artist;
+  final String album;
+  final List<String> genres; // ⬅️ 改为 List<String>
+  final List<String> performers; // ⬅️ 新增
+  final int year;
+  final int trackNumber;
+  final int trackTotal;
+  final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
+  final Uint8List? artwork;
+
+  const RawMetadata({
+    this.title = '',
+    this.artist = '',
+    this.album = '',
+    this.genres = const [],
+    this.performers = const [],
+    this.year = 0,
+    this.trackNumber = 0,
+    this.trackTotal = 0,
+    this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
+    this.artwork,
+  });
+
+  bool get isEmpty =>
+      title.isEmpty &&
+      artist.isEmpty &&
+      album.isEmpty &&
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
+
+  bool get isNotEmpty => !isEmpty;
+}
+
+/// 标准化后的元数据
+class NormalizedMetadata {
+  final String title;
+  final String artist;
+  final String album;
+  final List<String> genres;
+  final List<String> performers;
+  final int year;
+  final int trackNumber;
+  final int trackTotal;
+  final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
+  final Uint8List? artwork;
+
+  const NormalizedMetadata({
+    this.title = '',
+    this.artist = '',
+    this.album = '',
+    this.genres = const [],
+    this.performers = const [],
+    this.year = 0,
+    this.trackNumber = 0,
+    this.trackTotal = 0,
+    this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
+    this.artwork,
+  });
+
+  bool get isEmpty =>
+      title.isEmpty &&
+      artist.isEmpty &&
+      album.isEmpty &&
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
+
+  bool get isNotEmpty => !isEmpty;
+}
+
+/// 最终确认的元数据
+class FinalMetadata {
+  final String title;
+  final String artist;
+  final String album;
+  final String genre; // ⬅️ 简化为单个流派（取第一个）
+  final List<String> genres; // ⬅️ 保留完整列表
+  final List<String> performers;
+  final int year;
+  final int trackNumber;
+  final int trackTotal;
+  final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
+  final Uint8List? artwork;
+  final String source;
+
+  const FinalMetadata({
+    this.title = '',
+    this.artist = '',
+    this.album = '',
+    this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
+    this.year = 0,
+    this.trackNumber = 0,
+    this.trackTotal = 0,
+    this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
+    this.artwork,
+    this.source = 'unknown',
+  });
+
+  bool get isEmpty =>
+      title.isEmpty &&
+      artist.isEmpty &&
+      album.isEmpty &&
+      genre.isEmpty &&
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
+
+  bool get isNotEmpty => !isEmpty;
+}
+
+/// 候选元数据
+class CandidateMetadata {
+  final NormalizedMetadata metadata;
+  final double confidence;
+  final Map<String, double> evidence;
+
+  const CandidateMetadata({
+    required this.metadata,
+    required this.confidence,
+    this.evidence = const {},
+  });
+}

lib/metadata/metadata_normalizer.dart

@@ -0,0 +1,89 @@
+// lib/metadata/metadata_normalizer.dart
+import 'metadata_model.dart';
+
+class MetadataNormalizer {
+  NormalizedMetadata normalize(RawMetadata raw,
+      {String fileName = '', String filePath = ''}) {
+    // 1. 修剪空格
+    final title = raw.title.trim();
+    final artist = raw.artist.trim();
+    final album = raw.album.trim();
+
+    // 2. 如果 title 为空，从文件名推断
+    final finalTitle =
+        title.isNotEmpty ? title : _inferTitleFromFileName(fileName);
+
+    // 3. 如果 artist 为空，从路径推断或使用默认值
+    final finalArtist =
+        artist.isNotEmpty ? artist : _inferArtistFromPath(filePath);
+
+    // 4. 如果 performers 不为空且 artist 为空，用 performers 的第一个
+    final finalArtist2 = finalArtist.isNotEmpty
+        ? finalArtist
+        : (raw.performers.isNotEmpty ? raw.performers.first : '未知艺术家');
+
+    return NormalizedMetadata(
+      title: finalTitle,
+      artist: finalArtist2,
+      album: album,
+      genres: raw.genres,
+      performers: raw.performers,
+      year: raw.year,
+      trackNumber: raw.trackNumber,
+      trackTotal: raw.trackTotal,
+      discNumber: raw.discNumber,
+      totalDisc: raw.totalDisc,
+      duration: raw.duration,
+      artwork: raw.artwork,
+    );
+  }
+
+  String _inferTitleFromFileName(String fileName) {
+    final dotIndex = fileName.lastIndexOf('.');
+    if (dotIndex > 0) {
+      return fileName.substring(0, dotIndex).trim();
+    }
+    return fileName.trim();
+  }
+
+  String _inferArtistFromPath(String filePath) {
+    final parts = filePath.split(RegExp(r'[/\\]'));
+    if (parts.length >= 2) {
+      final candidate = parts[parts.length - 2].trim();
+      if (candidate.isNotEmpty && !candidate.contains(' ')) {
+        return candidate;
+      }
+    }
+    return '未知艺术家';
+  }
+
+  CandidateMetadata evaluate(
+      NormalizedMetadata normalized, List<Map<String, dynamic>> history) {
+    return CandidateMetadata(
+      metadata: normalized,
+      confidence: 0.8,
+      evidence: {'normalized': 0.8},
+    );
+  }
+
+  FinalMetadata decide(CandidateMetadata candidate, {double threshold = 0.6}) {
+    return FinalMetadata(
+      title: candidate.metadata.title,
+      artist: candidate.metadata.artist,
+      album: candidate.metadata.album,
+      genre: candidate.metadata.genres.isNotEmpty
+          ? candidate.metadata.genres.first
+          : '',
+      genres: candidate.metadata.genres,
+      performers: candidate.metadata.performers,
+      year: candidate.metadata.year,
+      trackNumber: candidate.metadata.trackNumber,
+      trackTotal: candidate.metadata.trackTotal,
+      discNumber: candidate.metadata.discNumber,
+      totalDisc: candidate.metadata.totalDisc,
+      duration: candidate.metadata.duration,
+      artwork: candidate.metadata.artwork,
+      source: 'normalized',
+    );
+  }
+}

lib/metadata/metadata_reader.dart

@@ -0,0 +1,39 @@
+// lib/metadata/metadata_reader.dart
+import 'dart:io';
+import 'package:audio_metadata_reader/audio_metadata_reader.dart' as amr;
+import 'metadata_model.dart';
+
+class MetadataReader {
+  Future<RawMetadata> readRawMetadata(File file) async {
+    try {
+      final meta = amr.readMetadata(file, getImage: false);
+
+      return RawMetadata(
+        title: meta.title ?? '',
+        artist: meta.artist ?? '',
+        album: meta.album ?? '',
+        // ⭐ genres 和 performers 是非空 List<String>，直接使用
+        genres: meta.genres,
+        performers: meta.performers,
+        year: _toInt(meta.year),
+        trackNumber: _toInt(meta.trackNumber),
+        trackTotal: _toInt(meta.trackTotal),
+        discNumber: _toInt(meta.discNumber),
+        totalDisc: _toInt(meta.totalDisc),
+        duration: meta.duration,
+      );
+    } catch (e) {
+      return const RawMetadata();
+    }
+  }
+
+  /// 安全转换为 int，处理 Object 类型
+  int _toInt(dynamic value) {
+    if (value == null) return 0;
+    if (value is int) return value;
+    if (value is String) return int.tryParse(value) ?? 0;
+    // 有些字段可能是 double 或 num
+    if (value is num) return value.toInt();
+    return 0;
+  }
+}

lib/metadata/metadata_service.dart

@@ -0,0 +1,47 @@
+// lib/metadata/metadata_service.dart
+import 'metadata_model.dart';
+import 'metadata_cache.dart';
+
+class MetadataService {
+  static final MetadataService _instance = MetadataService._internal();
+  factory MetadataService() => _instance;
+  MetadataService._internal();
+
+  final MetadataCache _cache = MetadataCache();
+
+  /// 临时版本：不进行实际文件读取，只返回基于文件名的 fallback
+  Future<FinalMetadata> getMetadata({
+    required String url,
+    required String fileName,
+    required String fileId,
+    bool forceRefresh = false,
+  }) async {
+    // 1. 检查缓存（如果有）
+    if (!forceRefresh) {
+      final cached = await _cache.get(fileId);
+      if (cached != null && cached.isNotEmpty) {
+        return cached;
+      }
+    }
+
+    // 2. 暂时不读取文件，直接 fallback
+    final fallback = _fallbackFromFileName(fileName);
+
+    // 3. 缓存结果（即使 fallback 也缓存，避免频繁调用）
+    if (fallback.isNotEmpty) {
+      await _cache.put(fileId, fallback);
+    }
+
+    return fallback;
+  }
+
+  FinalMetadata _fallbackFromFileName(String fileName) {
+    final dotIndex = fileName.lastIndexOf('.');
+    final title = dotIndex > 0 ? fileName.substring(0, dotIndex) : fileName;
+    return FinalMetadata(
+      title: title,
+      artist: '未知艺术家',
+      source: 'filename',
+    );
+  }
+}

lib/pages/player_page.dart

@@ -43,6 +43,41 @@ class _PlayerPageState extends State<PlayerPage> {
     }
   }
 
+  @override
+  void initState() {
+    super.initState();
+    // ⭐ 页面加载时主动拉取状态（多次重试）
+    _syncStateWithRetry();
+  }
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    // ⭐ 依赖变化时（如从后台返回）重新同步
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (mounted) {
+        context.read<AudioService>().syncPlayerStateNow();
+      }
+    });
+  }
+
+  void _syncStateWithRetry() {
+    final service = context.read<AudioService>();
+
+    // 立即同步
+    service.syncPlayerStateNow();
+
+    // 延迟重试
+    const delays = [200, 500, 800, 1200];
+    for (final delay in delays) {
+      Future.delayed(Duration(milliseconds: delay), () {
+        if (mounted) {
+          service.syncPlayerStateNow();
+        }
+      });
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final service = context.watch<AudioService>();
@@ -75,7 +110,6 @@ class _PlayerPageState extends State<PlayerPage> {
     }
 
     final isPlaying = service.isPlaying;
-    final duration = service.duration;
 
     return Scaffold(
       backgroundColor: const Color(0xFF0E1211),
@@ -156,7 +190,7 @@ class _PlayerPageState extends State<PlayerPage> {
               ],
             ),
             const SizedBox(height: 40),
-            _buildProgressSection(service, duration),
+            _buildProgressSection(service),
             const SizedBox(height: 32),
             _buildControlButtons(service, isPlaying),
             const SizedBox(height: 16),
@@ -166,118 +200,137 @@ class _PlayerPageState extends State<PlayerPage> {
     );
   }
 
-  Widget _buildProgressSection(AudioService service, Duration duration) {
+  Widget _buildProgressSection(AudioService service) {
     return ValueListenableBuilder(
       valueListenable: service.positionNotifier,
       builder: (context, position, _) {
-        final progress = duration.inMilliseconds > 0
-            ? position.inMilliseconds / duration.inMilliseconds
-            : 0.0;
+        return ValueListenableBuilder(
+          valueListenable: service.durationNotifier,
+          builder: (context, duration, _) {
+            // ⭐ 如果 duration 为 0，显示加载指示器
+            if (duration.inMilliseconds == 0) {
+              return const Padding(
+                padding: EdgeInsets.symmetric(vertical: 8),
+                child: LinearProgressIndicator(
+                  color: Color(0xFFB8D4D0),
+                  backgroundColor: Color(0xFF2A3332),
+                ),
+              );
+            }
 
-        final bufferProgress = duration.inMilliseconds > 0
-            ? (service.bufferedNotifier.value.inMilliseconds /
-                    duration.inMilliseconds)
-                .clamp(0.0, 1.0)
-            : 0.0;
+            final progress = duration.inMilliseconds > 0
+                ? position.inMilliseconds / duration.inMilliseconds
+                : 0.0;
 
-        final displayProgress = _dragProgress ?? progress;
+            final bufferProgress = duration.inMilliseconds > 0
+                ? (service.bufferedNotifier.value.inMilliseconds /
+                        duration.inMilliseconds)
+                    .clamp(0.0, 1.0)
+                : 0.0;
 
-        return Column(
-          children: [
-            SizedBox(
-              height: 20,
-              child: LayoutBuilder(
-                builder: (context, constraints) {
-                  final width = constraints.maxWidth;
-                  final bufferWidth = width * bufferProgress.clamp(0.0, 1.0);
-                  final progressWidth = width * displayProgress.clamp(0.0, 1.0);
+            final displayProgress = _dragProgress ?? progress;
 
-                  return Stack(
-                    alignment: Alignment.centerLeft,
-                    children: [
-                      Container(
-                        width: width,
-                        height: 4,
-                        decoration: BoxDecoration(
-                          color: Colors.grey[800],
-                          borderRadius: BorderRadius.circular(2),
-                        ),
-                      ),
-                      Container(
-                        width: bufferWidth,
-                        height: 4,
-                        decoration: BoxDecoration(
-                          color: const Color(0xFF4A7A7A),
-                          borderRadius: BorderRadius.circular(2),
-                        ),
-                      ),
-                      Container(
-                        width: progressWidth,
-                        height: 4,
-                        decoration: BoxDecoration(
-                          color: const Color(0xFFB8D4D0),
-                          borderRadius: BorderRadius.circular(2),
-                        ),
-                      ),
-                      Positioned.fill(
-                        child: SliderTheme(
-                          data: SliderTheme.of(context).copyWith(
-                            trackHeight: 0,
-                            activeTrackColor: Colors.transparent,
-                            inactiveTrackColor: Colors.transparent,
-                            thumbColor: Colors.transparent,
-                            overlayColor: Colors.transparent,
-                            thumbShape: const RoundSliderThumbShape(
-                              enabledThumbRadius: 0,
+            return Column(
+              children: [
+                SizedBox(
+                  height: 20,
+                  child: LayoutBuilder(
+                    builder: (context, constraints) {
+                      final width = constraints.maxWidth;
+                      final bufferWidth =
+                          width * bufferProgress.clamp(0.0, 1.0);
+                      final progressWidth =
+                          width * displayProgress.clamp(0.0, 1.0);
+
+                      return Stack(
+                        alignment: Alignment.centerLeft,
+                        children: [
+                          Container(
+                            width: width,
+                            height: 4,
+                            decoration: BoxDecoration(
+                              color: Colors.grey[800],
+                              borderRadius: BorderRadius.circular(2),
                             ),
                           ),
-                          child: Slider(
-                            value: displayProgress.clamp(0.0, 1.0),
-                            min: 0.0,
-                            max: 1.0,
-                            onChanged: (value) {
-                              setState(() {
-                                _dragProgress = value;
-                              });
-                            },
-                            onChangeEnd: (value) {
-                              final newPosition = Duration(
-                                milliseconds:
-                                    (value * duration.inMilliseconds).round(),
-                              );
-                              service.seekTo(newPosition);
-                              setState(() {
-                                _dragProgress = null;
-                              });
-                            },
+                          Container(
+                            width: bufferWidth,
+                            height: 4,
+                            decoration: BoxDecoration(
+                              color: const Color(0xFF4A7A7A),
+                              borderRadius: BorderRadius.circular(2),
+                            ),
                           ),
-                        ),
-                      ),
-                    ],
-                  );
-                },
-              ),
-            ),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceBetween,
-              children: [
-                Text(
-                  _formatDuration(position),
-                  style: TextStyle(
-                    fontSize: 12,
-                    color: Colors.grey[500],
+                          Container(
+                            width: progressWidth,
+                            height: 4,
+                            decoration: BoxDecoration(
+                              color: const Color(0xFFB8D4D0),
+                              borderRadius: BorderRadius.circular(2),
+                            ),
+                          ),
+                          Positioned.fill(
+                            child: SliderTheme(
+                              data: SliderTheme.of(context).copyWith(
+                                trackHeight: 0,
+                                activeTrackColor: Colors.transparent,
+                                inactiveTrackColor: Colors.transparent,
+                                thumbColor: Colors.transparent,
+                                overlayColor: Colors.transparent,
+                                thumbShape: const RoundSliderThumbShape(
+                                  enabledThumbRadius: 0,
+                                ),
+                              ),
+                              child: Slider(
+                                value: displayProgress.clamp(0.0, 1.0),
+                                min: 0.0,
+                                max: 1.0,
+                                onChanged: (value) {
+                                  setState(() {
+                                    _dragProgress = value;
+                                  });
+                                },
+                                onChangeEnd: (value) {
+                                  final newPosition = Duration(
+                                    milliseconds:
+                                        (value * duration.inMilliseconds)
+                                            .round(),
+                                  );
+                                  service.seekTo(newPosition);
+                                  setState(() {
+                                    _dragProgress = null;
+                                  });
+                                },
+                              ),
+                            ),
+                          ),
+                        ],
+                      );
+                    },
                   ),
                 ),
-                Text(
-                  _formatDuration(duration),
-                  style: TextStyle(
-                    fontSize: 12,
-                    color: Colors.grey[500],
-                  ),
+                Row(
+                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                  children: [
+                    Text(
+                      _formatDuration(position),
+                      style: TextStyle(
+                        fontSize: 12,
+                        color: Colors.grey[500],
+                      ),
+                    ),
+                    Text(
+                      _formatDuration(duration),
+                      style: TextStyle(
+                        fontSize: 12,
+                        color: Colors.grey[500],
+                      ),
+                    ),
+                  ],
                 ),
               ],
-            ),
-          ],
+            );
+          },
         );
       },
     );

lib/pages/webdav_file_list_page.dart

@@ -1,4 +1,5 @@
 // lib/pages/webdav_file_list_page.dart
+// ignore: unused_import
 import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';

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

@@ -3,6 +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';
 
 enum PlayMode {
   sequential,
@@ -29,7 +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;
@@ -40,7 +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);
@@ -48,13 +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;
@@ -62,7 +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;
@@ -78,12 +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:
@@ -99,7 +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();
@@ -128,7 +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);
@@ -146,14 +139,6 @@ 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;
-
     _startListening();
     notifyListeners();
 
@@ -162,9 +147,42 @@ class AudioService extends ChangeNotifier {
     }
 
     PlaybackService().play(song.url!);
+
+    // ⭐ 延迟同步兜底
+    _syncPlayerStateDelayed();
+
+    _loadMetadataForCurrentSong();
+  }
+
+  Future<void> _loadMetadataForCurrentSong() async {
+    if (_currentIndex < 0 || _currentIndex >= _queue.length) return;
+    final song = _queue[_currentIndex];
+    if (song.url == null || song.url!.isEmpty) return;
+
+    try {
+      final metadata = await MetadataService().getMetadata(
+        url: song.url!,
+        fileName: song.title,
+        fileId: song.id,
+      );
+
+      if (metadata.isNotEmpty) {
+        final updatedSong = Song(
+          id: song.id,
+          title: metadata.title.isNotEmpty ? metadata.title : song.title,
+          artist: metadata.artist.isNotEmpty ? metadata.artist : song.artist,
+          url: song.url,
+        );
+        _queue[_currentIndex] = updatedSong;
+        _currentSong = updatedSong;
+        notifyListeners();
+        _onSongChanged?.call(updatedSong);
+      }
+    } catch (e) {
+      debugPrint('⚠️ [AudioService] metadata load failed: $e');
+    }
   }
 
-  // ---- 下一首 ----
   void next() {
     if (_queue.isEmpty) return;
 
@@ -182,7 +200,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 上一首 ----
   void previous() {
     if (_queue.isEmpty) return;
 
@@ -208,7 +225,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 播放/暂停 ----
   void togglePlay() {
     if (_currentSong == null) return;
 
@@ -243,7 +259,39 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 监听 media_kit 状态 ----
+  // ⭐ 公开方法：供 PlayerPage 主动同步
+  void syncPlayerStateNow() {
+    final player = PlaybackService().player;
+    final pos = player.state.position;
+    final dur = player.state.duration;
+    final buf = player.state.buffer;
+
+    debugPrint(
+        '🎯 [AudioService] syncPlayerStateNow: pos=$pos, dur=$dur, buf=$buf');
+
+    // ⭐ 无条件更新（不要只判断 == 0）
+    if (pos.inMilliseconds >= 0) {
+      positionNotifier.value = pos;
+    }
+    if (dur.inMilliseconds > 0) {
+      durationNotifier.value = dur;
+    }
+    if (buf.inMilliseconds >= 0) {
+      bufferedNotifier.value = buf;
+    }
+  }
+
+  void _syncPlayerStateDelayed() {
+    syncPlayerStateNow();
+    Future.delayed(const Duration(milliseconds: 200), () {
+      syncPlayerStateNow();
+    });
+    Future.delayed(const Duration(milliseconds: 500), () {
+      syncPlayerStateNow();
+    });
+  }
+
+  // ---- 监听 ----
   void _startListening() {
     if (_listening) return;
     _listening = true;
@@ -267,7 +315,10 @@ class AudioService extends ChangeNotifier {
 
     _subscriptions.add(
       player.stream.duration.listen((duration) {
-        durationNotifier.value = duration;
+        debugPrint('🎯 [AudioService] durationStream: $duration');
+        if (duration.inMilliseconds > 0) {
+          durationNotifier.value = duration;
+        }
       }),
     );
 
@@ -277,7 +328,6 @@ class AudioService extends ChangeNotifier {
       }),
     );
 
-    // ⭐ 唯一监听 completed 的地方（带防重入）
     _subscriptions.add(
       player.stream.completed.listen((_) {
         _onPlaybackCompleted();
@@ -293,7 +343,6 @@ class AudioService extends ChangeNotifier {
     _subscriptions.clear();
   }
 
-  // ⭐ 防重入的完成事件处理
   void _onPlaybackCompleted() {
     if (_handlingCompletion) {
       debugPrint('⚠️ [service] completed ignored: already handling');

pubspec.lock

@@ -25,6 +25,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.13.1"
+  audio_metadata_reader:
+    dependency: "direct main"
+    description:
+      name: audio_metadata_reader
+      sha256: "79b08282447dfc4b7ff955f9c4eff824d7284c7b021ccfe8204550d8801a08a5"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.7.1"
   audio_service:
     dependency: "direct main"
     description:
@@ -73,6 +81,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.4.1"
+  charset:
+    dependency: transitive
+    description:
+      name: charset
+      sha256: "27802032a581e01ac565904ece8c8962564b1070690794f0072f6865958ce8b9"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.1"
   clock:
     dependency: transitive
     description:
@@ -224,6 +240,14 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "4.8.0"
+  intl:
+    dependency: transitive
+    description:
+      name: intl
+      sha256: "1ca20c894b1717686a2319b8548763d812bc0aabdac580420a44c5178c57a867"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.20.3"
   jni:
     dependency: transitive
     description:

pubspec.yaml

@@ -41,6 +41,7 @@ dependencies:
   permission_handler: ^11.3.1
   flutter_cache_manager: ^3.3.1
   sqflite: ^2.3.0
+  audio_metadata_reader: ^1.7.1
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.