camera_feature1.dart

static List<CameraDescription> _cameras = [];
CameraController? _controller;
  
Future _startLiveFeed() async {
    final camera = _cameras[_cameraIndex];
    _controller = CameraController(
      camera,
      // Set to ResolutionPreset.high. Do NOT set it to ResolutionPreset.max because for some phones does NOT work.
      ResolutionPreset.high,

      enableAudio: false,
      imageFormatGroup: Platform.isAndroid
          ? ImageFormatGroup.nv21
          : ImageFormatGroup.bgra8888,
    );

    _controller?.initialize().then((_) {
      if (!mounted) {
        return;
      }

      _controller?.getMinZoomLevel().then((value) {
        _currentZoomLevel = value;
        _minAvailableZoom = value;
      });
      _controller?.getMaxZoomLevel().then((value) {
        _maxAvailableZoom = value;
      });
      _currentExposureOffset = 0.0;
      _controller?.getMinExposureOffset().then((value) {
        _minAvailableExposureOffset = value;
      });
      _controller?.getMaxExposureOffset().then((value) {
        _maxAvailableExposureOffset = value;
      });
      _controller?.startImageStream(_processCameraImage).then((value) {
        if (widget.onCameraFeedReady != null) {
          widget.onCameraFeedReady!();
        }
        if (widget.onCameraLensDirectionChanged != null) {
          widget.onCameraLensDirectionChanged!(camera.lensDirection);
        }
      });
      setState(() {});
    });
  }