Source Code added

mobile/lib/services/gcast.service.dart

@@ -0,0 +1,250 @@
+import 'dart:async';
+
+import 'package:cast/session.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/models/cast/cast_manager_state.dart';
+import 'package:immich_mobile/models/sessions/session_create_response.model.dart';
+import 'package:immich_mobile/repositories/asset_api.repository.dart';
+import 'package:immich_mobile/repositories/gcast.repository.dart';
+import 'package:immich_mobile/repositories/sessions_api.repository.dart';
+import 'package:immich_mobile/utils/image_url_builder.dart';
+// ignore: import_rule_openapi, we are only using the AssetMediaSize enum
+import 'package:openapi/api.dart';
+
+final gCastServiceProvider = Provider(
+  (ref) => GCastService(
+    ref.watch(gCastRepositoryProvider),
+    ref.watch(sessionsAPIRepositoryProvider),
+    ref.watch(assetApiRepositoryProvider),
+  ),
+);
+
+class GCastService {
+  final GCastRepository _gCastRepository;
+  final SessionsAPIRepository _sessionsApiService;
+  final AssetApiRepository _assetApiRepository;
+
+  SessionCreateResponse? sessionKey;
+  String? currentAssetId;
+  bool isConnected = false;
+  int? _sessionId;
+  Timer? _mediaStatusPollingTimer;
+
+  void Function(bool)? onConnectionState;
+
+  void Function(Duration)? onCurrentTime;
+
+  void Function(Duration)? onDuration;
+
+  void Function(String)? onReceiverName;
+
+  void Function(CastState)? onCastState;
+
+  GCastService(this._gCastRepository, this._sessionsApiService, this._assetApiRepository) {
+    _gCastRepository.onCastStatus = _onCastStatusCallback;
+    _gCastRepository.onCastMessage = _onCastMessageCallback;
+  }
+
+  void _onCastStatusCallback(CastSessionState state) {
+    if (state == CastSessionState.connected) {
+      onConnectionState?.call(true);
+      isConnected = true;
+    } else if (state == CastSessionState.closed) {
+      onConnectionState?.call(false);
+      isConnected = false;
+      onReceiverName?.call("");
+      currentAssetId = null;
+    }
+  }
+
+  void _onCastMessageCallback(Map<String, dynamic> message) {
+    switch (message['type']) {
+      case "MEDIA_STATUS":
+        _handleMediaStatus(message);
+        break;
+    }
+  }
+
+  void _handleMediaStatus(Map<String, dynamic> message) {
+    final statusList = (message['status'] as List).whereType<Map<String, dynamic>>().toList();
+
+    if (statusList.isEmpty) {
+      return;
+    }
+
+    final status = statusList[0];
+    switch (status['playerState']) {
+      case "PLAYING":
+        onCastState?.call(CastState.playing);
+        break;
+      case "PAUSED":
+        onCastState?.call(CastState.paused);
+        break;
+      case "BUFFERING":
+        onCastState?.call(CastState.buffering);
+        break;
+      case "IDLE":
+        onCastState?.call(CastState.idle);
+
+        // stop polling for media status if the video finished playing
+        if (status["idleReason"] == "FINISHED") {
+          _mediaStatusPollingTimer?.cancel();
+        }
+
+        break;
+    }
+
+    if (status["media"] != null && status["media"]["duration"] != null) {
+      final duration = Duration(milliseconds: (status["media"]["duration"] * 1000 ?? 0).toInt());
+      onDuration?.call(duration);
+    }
+
+    if (status["mediaSessionId"] != null) {
+      _sessionId = status["mediaSessionId"];
+    }
+
+    if (status["currentTime"] != null) {
+      final currentTime = Duration(milliseconds: (status["currentTime"] * 1000 ?? 0).toInt());
+      onCurrentTime?.call(currentTime);
+    }
+  }
+
+  Future<void> connect(dynamic device) async {
+    await _gCastRepository.connect(device);
+
+    onReceiverName?.call(device.extras["fn"] ?? "Google Cast");
+  }
+
+  CastDestinationType getType() {
+    return CastDestinationType.googleCast;
+  }
+
+  Future<bool> initialize() async {
+    // there is nothing blocking us from using Google Cast that we can check for
+    return true;
+  }
+
+  Future<void> disconnect() async {
+    onReceiverName?.call("");
+    currentAssetId = null;
+    await _gCastRepository.disconnect();
+  }
+
+  bool isSessionValid() {
+    // check if we already have a session token
+    // we should always have a expiration date
+    if (sessionKey == null || sessionKey?.expiresAt == null) {
+      return false;
+    }
+
+    final tokenExpiration = DateTime.parse(sessionKey!.expiresAt!);
+
+    // we want to make sure we have at least 10 seconds remaining in the session
+    // this is to account for network latency and other delays when sending the request
+    final bufferedExpiration = tokenExpiration.subtract(const Duration(seconds: 10));
+
+    return bufferedExpiration.isAfter(DateTime.now());
+  }
+
+  void loadMedia(RemoteAsset asset, bool reload) async {
+    if (!isConnected) {
+      return;
+    } else if (asset.id == currentAssetId && !reload) {
+      return;
+    }
+
+    // create a session key
+    if (!isSessionValid()) {
+      sessionKey = await _sessionsApiService.createSession(
+        "Cast",
+        "Google Cast",
+        duration: const Duration(minutes: 15).inSeconds,
+      );
+    }
+
+    final unauthenticatedUrl = asset.isVideo
+        ? getPlaybackUrlForRemoteId(asset.id)
+        : getThumbnailUrlForRemoteId(asset.id, type: AssetMediaSize.fullsize);
+
+    final authenticatedURL = "$unauthenticatedUrl&sessionKey=${sessionKey?.token}";
+
+    // get image mime type
+    final mimeType = await _assetApiRepository.getAssetMIMEType(asset.id);
+
+    if (mimeType == null) {
+      return;
+    }
+
+    _gCastRepository.sendMessage(CastSession.kNamespaceMedia, {
+      "type": "LOAD",
+      "media": {
+        "contentId": authenticatedURL,
+        "streamType": "BUFFERED",
+        "contentType": mimeType,
+        "contentUrl": authenticatedURL,
+      },
+      "autoplay": true,
+    });
+
+    currentAssetId = asset.id;
+
+    // we need to poll for media status since the cast device does not
+    // send a message when the media is loaded for whatever reason
+    // only do this on videos
+    _mediaStatusPollingTimer?.cancel();
+
+    if (asset.isVideo) {
+      _mediaStatusPollingTimer = Timer.periodic(const Duration(milliseconds: 500), (timer) {
+        if (isConnected) {
+          _gCastRepository.sendMessage(CastSession.kNamespaceMedia, {
+            "type": "GET_STATUS",
+            "mediaSessionId": _sessionId,
+          });
+        } else {
+          timer.cancel();
+        }
+      });
+    }
+  }
+
+  void play() {
+    _gCastRepository.sendMessage(CastSession.kNamespaceMedia, {"type": "PLAY", "mediaSessionId": _sessionId});
+  }
+
+  void pause() {
+    _gCastRepository.sendMessage(CastSession.kNamespaceMedia, {"type": "PAUSE", "mediaSessionId": _sessionId});
+  }
+
+  void seekTo(Duration position) {
+    _gCastRepository.sendMessage(CastSession.kNamespaceMedia, {
+      "type": "SEEK",
+      "mediaSessionId": _sessionId,
+      "currentTime": position.inSeconds,
+    });
+  }
+
+  void stop() {
+    _gCastRepository.sendMessage(CastSession.kNamespaceMedia, {"type": "STOP", "mediaSessionId": _sessionId});
+    _mediaStatusPollingTimer?.cancel();
+
+    currentAssetId = null;
+  }
+
+  // 0x01 is display capability bitmask
+  bool isDisplay(int ca) => (ca & 0x01) != 0;
+
+  Future<List<(String, CastDestinationType, dynamic)>> getDevices() async {
+    final dests = await _gCastRepository.listDestinations();
+
+    return dests
+        .map((device) => (device.extras["fn"] ?? "Google Cast", CastDestinationType.googleCast, device))
+        .where((device) {
+          final caString = device.$3.extras["ca"];
+          final caNumber = int.tryParse(caString ?? "0") ?? 0;
+
+          return isDisplay(caNumber);
+        })
+        .toList(growable: false);
+  }
+}