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diff --git a/src/ipa/raspberrypi/controller/algorithm.hpp b/src/ipa/raspberrypi/controller/algorithm.hpp
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+++ b/src/ipa/raspberrypi/controller/algorithm.hpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * algorithm.hpp - ISP control algorithm interface
+ */
+#pragma once
+
+// All algorithms should be derived from this class and made available to the
+// Controller.
+
+#include <string>
+#include <memory>
+#include <map>
+#include <atomic>
+
+#include "logging.hpp"
+#include "controller.hpp"
+
+#include <boost/property_tree/ptree.hpp>
+
+namespace RPi {
+
+// This defines the basic interface for all control algorithms.
+
+class Algorithm
+{
+public:
+	Algorithm(Controller *controller)
+		: controller_(controller), paused_(false)
+	{
+	}
+	virtual ~Algorithm() {}
+	virtual char const *Name() const = 0;
+	virtual bool IsPaused() const { return paused_; }
+	virtual void Pause() { paused_ = true; }
+	virtual void Resume() { paused_ = false; }
+	virtual void Read(boost::property_tree::ptree const &params);
+	virtual void Initialise();
+	virtual void SwitchMode(CameraMode const &camera_mode);
+	virtual void Prepare(Metadata *image_metadata);
+	virtual void Process(StatisticsPtr &stats, Metadata *image_metadata);
+	Metadata &GetGlobalMetadata() const
+	{
+		return controller_->GetGlobalMetadata();
+	}
+
+private:
+	Controller *controller_;
+	std::atomic<bool> paused_;
+};
+
+// This code is for automatic registration of Front End algorithms with the
+// system.
+
+typedef Algorithm *(*AlgoCreateFunc)(Controller *controller);
+struct RegisterAlgorithm {
+	RegisterAlgorithm(char const *name, AlgoCreateFunc create_func);
+};
+std::map<std::string, AlgoCreateFunc> const &GetAlgorithms();
+
+} // namespace RPi