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>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/lux.hpp b/src/ipa/raspberrypi/controller/rpi/lux.hpp
new file mode 100644
index 00000000..eb935409
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/rpi/lux.hpp
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * lux.hpp - Lux control algorithm
+ */
+#pragma once
+
+#include <atomic>
+#include <mutex>
+
+#include "../lux_status.h"
+#include "../algorithm.hpp"
+
+// This is our implementation of the "lux control algorithm".
+
+namespace RPi {
+
+class Lux : public Algorithm
+{
+public:
+	Lux(Controller *controller);
+	char const *Name() const override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void Prepare(Metadata *image_metadata) override;
+	void Process(StatisticsPtr &stats, Metadata *image_metadata) override;
+	void SetCurrentAperture(double aperture);
+
+private:
+	// These values define the conditions of the reference image, against
+	// which we compare the new image.
+	double reference_shutter_speed_; // in micro-seconds
+	double reference_gain_;
+	double reference_aperture_; // units of 1/f
+	double reference_Y_; // out of 65536
+	double reference_lux_;
+	std::atomic<double> current_aperture_;
+	LuxStatus status_;
+	std::mutex mutex_;
+};
+
+} // namespace RPi