refactors design to flutter driven service core.

2026-05-16 20:52:39 -07:00
parent 533a3d74f3
commit 5ea7442c7c
8 changed files with 532 additions and 400 deletions
@@ -1,48 +1,94 @@
 import 'dart:async';

-import 'package:audio_session/audio_session.dart';
+import 'package:audio_service/audio_service.dart';
 import 'package:flutter/foundation.dart';
-import 'package:just_audio_background/just_audio_background.dart';
-import 'package:just_audio/just_audio.dart';
+
+import 'kryz_audio_handler.dart';
+import 'live_info_business_object.dart';

 enum StreamingPlaybackStatus { stopped, buffering, playing }

 class StreamingAudioBusinessObject extends ChangeNotifier {
-  StreamingAudioBusinessObject({
-    this.streamUrl = 'https://kryz.out.airtime.pro/kryz_a',
-  }) {
-    _playerStateSubscription = _player.playerStateStream.listen((state) {
-      _setPlaybackStatus(_mapPlayerStateToStatus(state));
-    });
+  StreamingAudioBusinessObject() {
+    if (_audioHandler == null && _audioHandlerInitFuture == null) {
+      initializeBackgroundAudio();
+    }
+
+    final initFuture = _audioHandlerInitFuture;
+    if (initFuture != null) {
+      initFuture.then((handler) {
+        if (_isDisposed) {
+          return;
+        }
+        _attachHandler(handler);
+      });
+    }
+
+    final handler = _audioHandler;
+    if (handler != null) {
+      _attachHandler(handler);
+    }
  }

-  final String streamUrl;
-  final AudioPlayer _player = AudioPlayer();
-  late final StreamSubscription<PlayerState> _playerStateSubscription;
-  bool _isSourceLoaded = false;
+  static AudioHandler? _audioHandler;
+  static Future<AudioHandler>? _audioHandlerInitFuture;
+
+  static Future<void> initializeBackgroundAudio() async {
+    if (_audioHandler != null) {
+      return;
+    }
+
+    _audioHandlerInitFuture ??= AudioService.init(
+      builder: () => KryzAudioHandler(),
+      config: const AudioServiceConfig(
+        androidNotificationChannelId: 'com.kryzgoflutter.audio.channel',
+        androidNotificationChannelName: 'KRYZ Audio Playback',
+        androidNotificationOngoing: true,
+        androidStopForegroundOnPause: true,
+      ),
+    ).then((handler) {
+      _audioHandler = handler;
+      return handler;
+    }).catchError((error) {
+      _audioHandlerInitFuture = null;
+      throw error;
+    });
+
+    await _audioHandlerInitFuture;
+  }
+
+  String get streamUrl => KryzAudioHandler.streamUrl;
+
+  StreamSubscription<PlaybackState>? _playbackStateSubscription;
+  StreamSubscription<MediaItem?>? _mediaItemSubscription;
  StreamingPlaybackStatus _playbackStatus = StreamingPlaybackStatus.stopped;
-  bool _isAudioSessionConfigured = false;
-  bool _playRequested = false;
+  bool _isDisposed = false;
+  bool _isAttached = false;
+  String _currentTitle = 'KRYZ Live Stream';
+  String _currentSubtitle = 'KRYZ Radio';

  StreamingPlaybackStatus get playbackStatus => _playbackStatus;
  bool get isPlaying => _playbackStatus == StreamingPlaybackStatus.playing;
  bool get isBuffering => _playbackStatus == StreamingPlaybackStatus.buffering;
  bool get isStopped => _playbackStatus == StreamingPlaybackStatus.stopped;
+  String get currentTitle => _currentTitle;
+  String get currentSubtitle => _currentSubtitle;

-  StreamingPlaybackStatus _mapPlayerStateToStatus(PlayerState state) {
-    if (state.processingState == ProcessingState.completed) {
+  StreamingPlaybackStatus _mapPlaybackStateToStatus(PlaybackState state) {
+    if (state.processingState == AudioProcessingState.completed) {
      return StreamingPlaybackStatus.stopped;
    }

    if (state.playing) {
-      if (state.processingState == ProcessingState.ready) {
+      if (state.processingState == AudioProcessingState.ready) {
        return StreamingPlaybackStatus.playing;
      }

      return StreamingPlaybackStatus.buffering;
    }

-    if (_playRequested && state.processingState != ProcessingState.completed) {
+    if (state.processingState == AudioProcessingState.buffering ||
+        state.processingState == AudioProcessingState.loading) {
      return StreamingPlaybackStatus.buffering;
    }

@@ -58,58 +104,66 @@ class StreamingAudioBusinessObject extends ChangeNotifier {
    notifyListeners();
  }

-  Future<void> _configureAudioSessionIfNeeded() async {
-    if (_isAudioSessionConfigured) {
-      return;
-    }
-
-    final session = await AudioSession.instance;
-    await session.configure(const AudioSessionConfiguration.music());
-    _isAudioSessionConfigured = true;
-  }
-
  Future<void> play() async {
-    _playRequested = true;
-    await _configureAudioSessionIfNeeded();
    _setPlaybackStatus(StreamingPlaybackStatus.buffering);
-
-    try {
-      if (!_isSourceLoaded) {
-        await _player.setAudioSource(
-          AudioSource.uri(
-            Uri.parse(streamUrl),
-            tag: const MediaItem(
-              id: 'kryz-live-stream',
-              title: 'KRYZ Live Stream',
-              artist: 'KRYZ Radio',
-              album: 'Live',
-            ),
-          ),
-        );
-        _isSourceLoaded = true;
-      }
-
-      final session = await AudioSession.instance;
-      await session.setActive(true);
-      await _player.play();
-    } catch (_) {
-      _playRequested = false;
-      _setPlaybackStatus(StreamingPlaybackStatus.stopped);
-      rethrow;
-    }
+    final handler = await _requireHandler();
+    await handler.play();
  }

  Future<void> stop() async {
-    _playRequested = false;
-    _isSourceLoaded = false;
+    final handler = await _requireHandler();
+    await handler.stop();
    _setPlaybackStatus(StreamingPlaybackStatus.stopped);
-    await _player.stop();
+  }
+
+  Future<void> updateMetadataFromLiveInfo(LiveInfoSnapshot? snapshot) async {
+    final handler = await _requireHandler();
+    await handler.updateMetadataFromLiveInfo(snapshot);
+  }
+
+  Future<KryzAudioHandler> _requireHandler() async {
+    await initializeBackgroundAudio();
+    final handler = _audioHandler;
+    if (handler is! KryzAudioHandler) {
+      throw StateError('KryzAudioHandler is not initialized');
+    }
+    _attachHandler(handler);
+    return handler;
+  }
+
+  void _attachHandler(AudioHandler handler) {
+    if (_isAttached) {
+      return;
+    }
+
+    _isAttached = true;
+    _playbackStateSubscription = handler.playbackState.listen((state) {
+      _setPlaybackStatus(_mapPlaybackStateToStatus(state));
+    });
+    _mediaItemSubscription = handler.mediaItem.listen((item) {
+      if (item == null) {
+        return;
+      }
+
+      final title = item.title.trim().isEmpty ? 'KRYZ Live Stream' : item.title;
+      final subtitle =
+          (item.artist ?? '').trim().isEmpty ? 'KRYZ Radio' : item.artist!.trim();
+
+      if (title == _currentTitle && subtitle == _currentSubtitle) {
+        return;
+      }
+
+      _currentTitle = title;
+      _currentSubtitle = subtitle;
+      notifyListeners();
+    });
  }

  @override
  void dispose() {
-    _playerStateSubscription.cancel();
-    _player.dispose();
+    _isDisposed = true;
+    _playbackStateSubscription?.cancel();
+    _mediaItemSubscription?.cancel();
    super.dispose();
  }
 }