ente/lib/services/object_detection/utils/isolate_utils.dart

// import 'dart:isolate';
// import "dart:typed_data";

// import 'package:image/image.dart' as imgLib;
// import "package:photos/services/object_detection/models/predictions.dart";
// import "package:photos/services/object_detection/tflite/classifier.dart";
// import 'package:photos/services/object_detection/tflite/cocossd_classifier.dart';
// import "package:photos/services/object_detection/tflite/mobilenet_classifier.dart";
// import "package:photos/services/object_detection/tflite/scene_classifier.dart";
// import 'package:tflite_flutter/tflite_flutter.dart';

// /// Manages separate Isolate instance for inference
// class IsolateUtils {
//   static const String debugName = "InferenceIsolate";

//   late SendPort _sendPort;
//   final _receivePort = ReceivePort();

//   SendPort get sendPort => _sendPort;

//   Future<void> start() async {
//     await Isolate.spawn<SendPort>(
//       entryPoint,
//       _receivePort.sendPort,
//       debugName: debugName,
//     );

//     _sendPort = await _receivePort.first;
//   }

//   static void entryPoint(SendPort sendPort) async {
//     final port = ReceivePort();
//     sendPort.send(port.sendPort);

//     await for (final IsolateData isolateData in port) {
//       final classifier = _getClassifier(isolateData);
//       final image = imgLib.decodeImage(isolateData.input);
//       try {
//         final results = classifier.predict(image!);
//         isolateData.responsePort.send(results);
//       } catch (e) {
//         isolateData.responsePort.send(Predictions(null, null, error: e));
//       }
//     }
//   }

//   static Classifier _getClassifier(IsolateData isolateData) {
//     final interpreter = Interpreter.fromAddress(isolateData.interpreterAddress);
//     if (isolateData.type == ClassifierType.cocossd) {
//       return CocoSSDClassifier(
//         interpreter: interpreter,
//         labels: isolateData.labels,
//       );
//     } else if (isolateData.type == ClassifierType.mobilenet) {
//       return MobileNetClassifier(
//         interpreter: interpreter,
//         labels: isolateData.labels,
//       );
//     } else {
//       return SceneClassifier(
//         interpreter: interpreter,
//         labels: isolateData.labels,
//       );
//     }
//   }
// }

// /// Bundles data to pass between Isolate
// class IsolateData {
//   Uint8List input;
//   int interpreterAddress;
//   List<String> labels;
//   ClassifierType type;
//   late SendPort responsePort;

//   IsolateData(
//     this.input,
//     this.interpreterAddress,
//     this.labels,
//     this.type,
//   );
// }

// enum ClassifierType {
//   cocossd,
//   mobilenet,
//   scenes,
// }