add first version

2026-03-02 22:57:35 +08:00
parent d517195df7
commit d9631fbb80
17 changed files with 1631 additions and 93 deletions
--- a/aisee_flutter/lib/services/camera_service.dart
+++ b/aisee_flutter/lib/services/camera_service.dart
@@ -0,0 +1,158 @@
+import 'dart:async';
+import 'dart:typed_data';
+import 'package:camera/camera.dart';
+import 'package:flutter/foundation.dart';
+import 'package:image/image.dart' as img;
+import '../utils/app_config.dart';
+
+class CameraService extends ChangeNotifier {
+  CameraController? _controller;
+  List<CameraDescription> _cameras = [];
+  bool _isInitialized = false;
+  bool _isStreaming = false;
+  Timer? _captureTimer;
+
+  CameraController? get controller => _controller;
+  bool get isInitialized => _isInitialized;
+  bool get isStreaming => _isStreaming;
+
+  /// 初始化相机
+  Future<void> initialize() async {
+    try {
+      _cameras = await availableCameras();
+      if (_cameras.isEmpty) {
+        print('没有可用的相机');
+        return;
+      }
+
+      // 使用后置摄像头
+      final camera = _cameras.firstWhere(
+        (camera) => camera.lensDirection == CameraLensDirection.back,
+        orElse: () => _cameras.first,
+      );
+
+      _controller = CameraController(
+        camera,
+        ResolutionPreset.medium, // 中等分辨率，平衡质量和性能
+        enableAudio: false,
+        imageFormatGroup: ImageFormatGroup.jpeg,
+      );
+
+      await _controller!.initialize();
+      _isInitialized = true;
+      notifyListeners();
+
+      print('相机初始化成功');
+    } catch (e) {
+      print('相机初始化失败: $e');
+      _isInitialized = false;
+    }
+  }
+
+  /// 拍摄单张照片
+  Future<Uint8List?> takePicture() async {
+    if (!_isInitialized || _controller == null) return null;
+
+    try {
+      final XFile image = await _controller!.takePicture();
+      final bytes = await image.readAsBytes();
+
+      // 压缩图像
+      final compressedBytes = await _compressImage(bytes);
+      return compressedBytes;
+    } catch (e) {
+      print('拍照失败: $e');
+      return null;
+    }
+  }
+
+  /// 开始实时捕获（定时拍照）
+  void startStreaming(Function(Uint8List) onImageCaptured) {
+    if (_isStreaming) return;
+
+    _isStreaming = true;
+    notifyListeners();
+
+    _captureTimer = Timer.periodic(AppConfig.captureInterval, (timer) async {
+      if (!_isStreaming) {
+        timer.cancel();
+        return;
+      }
+
+      final imageBytes = await takePicture();
+      if (imageBytes != null) {
+        onImageCaptured(imageBytes);
+      }
+    });
+
+    print('开始实时捕获，间隔: ${AppConfig.captureInterval.inMilliseconds}ms');
+  }
+
+  /// 停止实时捕获
+  void stopStreaming() {
+    _isStreaming = false;
+    _captureTimer?.cancel();
+    _captureTimer = null;
+    notifyListeners();
+    print('停止实时捕获');
+  }
+
+  /// 压缩图像
+  Future<Uint8List> _compressImage(Uint8List bytes) async {
+    return await compute(_compressImageIsolate, bytes);
+  }
+
+  /// 在独立 Isolate 中压缩图像（避免阻塞 UI）
+  static Uint8List _compressImageIsolate(Uint8List bytes) {
+    // 解码图像
+    img.Image? image = img.decodeImage(bytes);
+    if (image == null) return bytes;
+
+    // 调整大小
+    if (image.width > AppConfig.imageMaxWidth ||
+        image.height > AppConfig.imageMaxHeight) {
+      image = img.copyResize(
+        image,
+        width: AppConfig.imageMaxWidth,
+        height: AppConfig.imageMaxHeight,
+      );
+    }
+
+    // 压缩为 JPEG
+    final compressed = img.encodeJpg(image, quality: AppConfig.imageQuality);
+
+    print('图像压缩: ${bytes.length} bytes -> ${compressed.length} bytes');
+    return Uint8List.fromList(compressed);
+  }
+
+  /// 切换摄像头
+  Future<void> switchCamera() async {
+    if (_cameras.length < 2) return;
+
+    final currentLens = _controller?.description.lensDirection;
+    final newCamera = _cameras.firstWhere(
+      (camera) => camera.lensDirection != currentLens,
+      orElse: () => _cameras.first,
+    );
+
+    await _controller?.dispose();
+
+    _controller = CameraController(
+      newCamera,
+      ResolutionPreset.medium,
+      enableAudio: false,
+      imageFormatGroup: ImageFormatGroup.jpeg,
+    );
+
+    await _controller!.initialize();
+    notifyListeners();
+  }
+
+  /// 释放资源
+  @override
+  void dispose() {
+    stopStreaming();
+    _controller?.dispose();
+    super.dispose();
+  }
+}