cameraImageToInputImage function

InputImage? cameraImageToInputImage(CameraImage image, int sensorOrientation)

Convert a CameraImage to an InputImage for ML Kit processing.

Returns null if the image format or rotation cannot be determined.

Implementation

InputImage? cameraImageToInputImage(
  CameraImage image,
  int sensorOrientation,
) {
  final rotation = InputImageRotationValue.fromRawValue(sensorOrientation);
  if (rotation == null) return null;

  final format = InputImageFormatValue.fromRawValue(image.format.raw);
  if (format == null) return null;

  // nv21 (Android) and bgra8888 (iOS) are single-plane formats.
  // yuv420 (Android fallback) has multiple planes that must be concatenated.
  final Uint8List bytes;
  if (image.planes.length == 1) {
    bytes = image.planes[0].bytes;
  } else {
    bytes = _concatenatePlanes(image.planes);
  }

  return InputImage.fromBytes(
    bytes: bytes,
    metadata: InputImageMetadata(
      size: Size(image.width.toDouble(), image.height.toDouble()),
      rotation: rotation,
      format: format,
      bytesPerRow: image.planes[0].bytesPerRow,
    ),
  );
}