diff --git a/modules/camera/3_4/metadata/converter_interface.h b/modules/camera/3_4/metadata/converter_interface.h
new file mode 100644
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+++ b/modules/camera/3_4/metadata/converter_interface.h
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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef V4L2_CAMERA_HAL_METADATA_CONVERTER_INTERFACE_H_
+#define V4L2_CAMERA_HAL_METADATA_CONVERTER_INTERFACE_H_
+
+#include "../common.h"
+
+namespace v4l2_camera_hal {
+
+// A ConverterInterface converts metadata values to V4L2 values vice-versa.
+template <typename T_metadata, typename T_V4L2>
+class ConverterInterface {
+ public:
+  virtual ~ConverterInterface(){};
+
+  // Convert.
+  virtual int MetadataToV4L2(T_metadata value, T_V4L2* conversion) = 0;
+  virtual int V4L2ToMetadata(T_V4L2 value, T_metadata* conversion) = 0;
+};
+
+}  // namespace v4l2_camera_hal
+
+#endif  // V4L2_CAMERA_HAL_METADATA_CONVERTER_INTERFACE_H_