baseOptions method

Implementation

ffi.Pointer<bindings.MpBaseOptions> baseOptions(BaseOptions options) {
  final ffi.Pointer<bindings.MpBaseOptions> result = _arena<bindings.MpBaseOptions>();
  final bindings.MpBaseOptions value = result.ref;
  value
    ..model_asset_buffer = ffi.nullptr
    ..model_asset_buffer_count = 0
    ..model_asset_path = ffi.nullptr
    ..file_descriptor = -1
    ..delegate = _delegate(options.delegate)
    ..host_environment = _hostEnvironment()
    ..host_system = _hostSystem()
    // The host version reaches MediaPipe's usage-logging path, so send a
    // stable SDK label rather than the Dart VM's full version string, which
    // also embeds OS details. See the privacy guide for the full contract.
    ..host_version = string('mp-dart-1')
    ..ca_bundle_path = ffi.nullptr
    ..app_id = ffi.nullptr
    ..app_version = ffi.nullptr;

  switch (options.modelAsset) {
    case ModelAssetPath(path: final String path):
      value.model_asset_path = string(path);
    case ModelAssetBytes(bytes: final Uint8List bytes):
      final ffi.Pointer<ffi.Uint8> buffer = _arena<ffi.Uint8>(bytes.length);
      buffer.asTypedList(bytes.length).setAll(0, bytes);
      value
        ..model_asset_buffer = buffer.cast<ffi.Char>()
        ..model_asset_buffer_count = bytes.length;
    case ModelAssetUri():
      throw const MpException(
        MpStatus.failedPrecondition,
        'Resolve URI-backed model assets before creating native options.',
      );
  }
  return result;
}