createUint8Tensor method

Pointer<Uint8> createUint8Tensor(Pointer<Pointer<OrtValue>> inputTensorPointer, { required Pointer<OrtMemoryInfo> memoryInfo, required List<int> values, })

You MUST call calloc.free on the returned pointer when you are done with it, i.e. once inference is complete.

Implementation

Pointer<Uint8> createUint8Tensor(
  Pointer<Pointer<OrtValue>> inputTensorPointer, {
  required Pointer<OrtMemoryInfo> memoryInfo,
  required List<int> values,
}) {
  final sizeOfUint8 = sizeOf<Uint8>();
  final inputTensorNative = calloc<Uint8>(values.length * sizeOfUint8);
  for (var i = 0; i < values.length; i++) {
    inputTensorNative[i] = values[i];
  }
  final inputShape = calloc<Int64>(2 * sizeOf<Int64>());
  inputShape[0] = 1;
  inputShape[1] = values.length;
  final status = createTensorWithDataAsOrtValue(
    inputTensorPointer,
    memoryInfo: memoryInfo,
    inputData: inputTensorNative.cast<Void>(),
    inputDataLengthInBytes: values.length * sizeOfUint8,
    inputShape: inputShape,
    inputShapeLengthInBytes: 2,
    onnxTensorElementDataType:
        ONNXTensorElementDataType.ONNX_TENSOR_ELEMENT_DATA_TYPE_UINT8.value,
  );
  if (status.isError) {
    final error =
        'Code: ${getErrorCodeMessage(status)}\n'
        'Message: ${consumeErrorMessage(status)}';
    calloc.free(inputTensorNative);
    calloc.free(inputShape);
    throw Exception(error);
  }
  calloc.free(inputShape);
  return inputTensorNative;
}