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/controller.cpp

@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * controller.cpp - ISP controller
+ */
+
+#include "algorithm.hpp"
+#include "controller.hpp"
+
+#include <boost/property_tree/json_parser.hpp>
+#include <boost/property_tree/ptree.hpp>
+
+using namespace RPi;
+
+Controller::Controller()
+	: switch_mode_called_(false) {}
+
+Controller::Controller(char const *json_filename)
+	: switch_mode_called_(false)
+{
+	Read(json_filename);
+	Initialise();
+}
+
+Controller::~Controller() {}
+
+void Controller::Read(char const *filename)
+{
+	RPI_LOG("Controller starting");
+	boost::property_tree::ptree root;
+	boost::property_tree::read_json(filename, root);
+	for (auto const &key_and_value : root) {
+		Algorithm *algo = CreateAlgorithm(key_and_value.first.c_str());
+		if (algo) {
+			algo->Read(key_and_value.second);
+			algorithms_.push_back(AlgorithmPtr(algo));
+		} else
+			RPI_LOG("WARNING: No algorithm found for \""
+				<< key_and_value.first << "\"");
+	}
+	RPI_LOG("Controller finished");
+}
+
+Algorithm *Controller::CreateAlgorithm(char const *name)
+{
+	auto it = GetAlgorithms().find(std::string(name));
+	return it != GetAlgorithms().end() ? (*it->second)(this) : nullptr;
+}
+
+void Controller::Initialise()
+{
+	RPI_LOG("Controller starting");
+	for (auto &algo : algorithms_)
+		algo->Initialise();
+	RPI_LOG("Controller finished");
+}
+
+void Controller::SwitchMode(CameraMode const &camera_mode)
+{
+	RPI_LOG("Controller starting");
+	for (auto &algo : algorithms_)
+		algo->SwitchMode(camera_mode);
+	switch_mode_called_ = true;
+	RPI_LOG("Controller finished");
+}
+
+void Controller::Prepare(Metadata *image_metadata)
+{
+	RPI_LOG("Controller::Prepare starting");
+	assert(switch_mode_called_);
+	for (auto &algo : algorithms_)
+		if (!algo->IsPaused())
+			algo->Prepare(image_metadata);
+	RPI_LOG("Controller::Prepare finished");
+}
+
+void Controller::Process(StatisticsPtr stats, Metadata *image_metadata)
+{
+	RPI_LOG("Controller::Process starting");
+	assert(switch_mode_called_);
+	for (auto &algo : algorithms_)
+		if (!algo->IsPaused())
+			algo->Process(stats, image_metadata);
+	RPI_LOG("Controller::Process finished");
+}
+
+Metadata &Controller::GetGlobalMetadata()
+{
+	return global_metadata_;
+}
+
+Algorithm *Controller::GetAlgorithm(std::string const &name) const
+{
+	// The passed name must be the entire algorithm name, or must match the
+	// last part of it with a period (.) just before.
+	size_t name_len = name.length();
+	for (auto &algo : algorithms_) {
+		char const *algo_name = algo->Name();
+		size_t algo_name_len = strlen(algo_name);
+		if (algo_name_len >= name_len &&
+		    strcasecmp(name.c_str(),
+			       algo_name + algo_name_len - name_len) == 0 &&
+		    (name_len == algo_name_len ||
+		     algo_name[algo_name_len - name_len - 1] == '.'))
+			return algo.get();
+	}
+	return nullptr;
+}