inputImageFromCameraImage static method

InputImage? inputImageFromCameraImage({ required CameraImage image, required CameraController? controller, required List<CameraDescription> cameras, required int cameraIndex, })

Generates an input image from a camera image.

image is the image data from the camera. controller is the camera controller. cameras is the list of available cameras. cameraIndex is the index of the camera to use. Returns an InputImage object if successful, otherwise returns null.

Implementation

static InputImage? inputImageFromCameraImage({
  required CameraImage image,
  required CameraController? controller,
  required List<CameraDescription> cameras,
  required int cameraIndex,
}) {
  if (controller == null) {
    return null;
  }
  final camera = cameras[cameraIndex];
  final sensorOrientation = camera.sensorOrientation;
  InputImageRotation? rotation;
  if (Platform.isIOS) {
    rotation = InputImageRotationValue.fromRawValue(sensorOrientation);
  } else if (Platform.isAndroid) {
    int? rotationCompensation =
        _orientations[controller.value.deviceOrientation];
    if (rotationCompensation == null) {
      return null;
    }
    if (camera.lensDirection == CameraLensDirection.front) {
      rotationCompensation = (sensorOrientation + rotationCompensation) % 360;
    } else {
      rotationCompensation =
          (sensorOrientation - rotationCompensation + 360) % 360;
    }
    rotation = InputImageRotationValue.fromRawValue(rotationCompensation);
  }
  if (rotation == null) {
    return null;
  }
  final format = InputImageFormatValue.fromRawValue(image.format.raw);
  final bool isValidFormat = format == null ||
      (Platform.isAndroid && format != InputImageFormat.nv21) ||
      (Platform.isIOS && format != InputImageFormat.bgra8888);
  if (isValidFormat) {
    return null;
  }
  if (image.planes.length != 1) {
    return null;
  }
  final plane = image.planes.first;
  final size = Size(image.width.toDouble(), image.height.toDouble());
  return InputImage.fromBytes(
    bytes: plane.bytes,
    metadata: InputImageMetadata(
      size: size,
      rotation: rotation,
      format: format,
      bytesPerRow: plane.bytesPerRow,
    ),
  );
}