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diff --git a/src/ipa/raspberrypi/controller/camera_mode.h b/src/ipa/raspberrypi/controller/camera_mode.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019-2020, Raspberry Pi (Trading) Limited
+ *
+ * camera_mode.h - description of a particular operating mode of a sensor
+ */
+#pragma once
+
+// Description of a "camera mode", holding enough information for control
+// algorithms to adapt their behaviour to the different modes of the camera,
+// including binning, scaling, cropping etc.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CAMERA_MODE_NAME_LEN 32
+
+struct CameraMode {
+ // bit depth of the raw camera output
+ uint32_t bitdepth;
+ // size in pixels of frames in this mode
+ uint16_t width, height;
+ // size of full resolution uncropped frame ("sensor frame")
+ uint16_t sensor_width, sensor_height;
+ // binning factor (1 = no binning, 2 = 2-pixel binning etc.)
+ uint8_t bin_x, bin_y;
+ // location of top left pixel in the sensor frame
+ uint16_t crop_x, crop_y;
+ // scaling factor (so if uncropped, width*scale_x is sensor_width)
+ double scale_x, scale_y;
+ // scaling of the noise compared to the native sensor mode
+ double noise_factor;
+ // line time in nanoseconds
+ double line_length;
+};
+
+#ifdef __cplusplus
+}
+#endif