93 lines
3.2 KiB
Dart
93 lines
3.2 KiB
Dart
import 'package:camera/camera.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/services.dart';
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import 'frame_analyzer.dart';
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/// camera 插件封装：后摄图像流（对应 Kotlin CameraController）。
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class AppCameraController {
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final List<CameraDescription> cameras;
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CameraController? controller;
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/// 图像流回调实际触发次数（诊断用，与 analyzer 帧计数区分）
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int streamCallbacks = 0;
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AppCameraController._(this.cameras);
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static Future<AppCameraController?> create() async {
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final cameras = await availableCameras();
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if (cameras.isEmpty) return null;
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return AppCameraController._(cameras);
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}
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bool get isInitialized => controller?.value.isInitialized ?? false;
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CameraController get currentController =>
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controller ?? (throw StateError('camera not initialized'));
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/// 图像流送达时的旋转角（传感器 → 竖屏显示所需的顺时针旋转）。
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/// 与 CameraX rotationDegrees 同公式；预览本身由平台旋转，检测框 overlay
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/// 用同一角度映射即可对齐。
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int get rotationDegrees {
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final c = controller;
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if (c == null) return 0;
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final deviceDegrees = switch (c.value.deviceOrientation) {
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DeviceOrientation.portraitUp => 0,
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DeviceOrientation.landscapeLeft => 90,
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DeviceOrientation.portraitDown => 180,
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DeviceOrientation.landscapeRight => 270,
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};
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final sensor = c.description.sensorOrientation;
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final isFront =
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c.description.lensDirection == CameraLensDirection.front;
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final degrees = (isFront ? sensor + deviceDegrees : sensor - deviceDegrees) % 360;
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return degrees < 0 ? degrees + 360 : degrees;
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}
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Future<void> start(FrameAnalyzer analyzer) async {
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await stop();
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final desc = cameras.firstWhere(
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(c) => c.lensDirection == CameraLensDirection.back,
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orElse: () => cameras.first);
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// iOS 用默认 bgra8888（420v 在部分 iOS 版本上视频输出静默不送帧），
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// Android 用 yuv420 多平面。
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final fmt = defaultTargetPlatform == TargetPlatform.iOS
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? ImageFormatGroup.bgra8888
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: ImageFormatGroup.yuv420;
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final c = CameraController(desc, ResolutionPreset.high,
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enableAudio: false, imageFormatGroup: fmt);
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controller = c;
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await c.initialize();
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// 相机（重新）启动后重置运动/背景参考与抽帧节流，避免旧场景残留
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analyzer.reset();
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analyzer.worker?.reset();
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debugPrint('[camera] initialized, starting image stream');
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try {
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await c.startImageStream((image) {
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streamCallbacks++;
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try {
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analyzer.analyze(image, rotationDegrees);
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} catch (e, st) {
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debugPrint('[camera] analyze error: $e\n$st');
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analyzer.recordStreamError('analyze: $e');
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}
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});
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debugPrint('[camera] startImageStream ok');
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} catch (e, st) {
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debugPrint('[camera] startImageStream FAILED: $e\n$st');
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analyzer.recordStreamError('startImageStream: $e');
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rethrow;
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}
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}
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Future<void> stop() async {
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final c = controller;
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if (c == null) return;
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controller = null;
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try {
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await c.stopImageStream();
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} catch (_) {}
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await c.dispose();
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}
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}
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