libcamera: ipa: Raspberry Pi IPA

Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and
associated libraries.

All code is licensed under the BSD-2-Clause terms.
Copyright (c) 2019-2020 Raspberry Pi Trading Ltd.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/raspberrypi/controller/device_status.h

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * device_status.h - device (image sensor) status
+ */
+#pragma once
+
+// Definition of "device metadata" which stores things like shutter time and
+// analogue gain that downstream control algorithms will want to know.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct DeviceStatus {
+	// time shutter is open, in microseconds
+	double shutter_speed;
+	double analogue_gain;
+	// 1.0/distance-in-metres, or 0 if unknown
+	double lens_position;
+	// 1/f so that brightness quadruples when this doubles, or 0 if unknown
+	double aperture;
+	// proportional to brightness with 0 = no flash, 1 = maximum flash
+	double flash_intensity;
+};
+
+#ifdef __cplusplus
+}
+#endif