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, 63 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/sdn.cpp b/src/ipa/raspberrypi/controller/rpi/sdn.cpp
new file mode 100644
index 00000000..28d9d983
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/rpi/sdn.cpp
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * sdn.cpp - SDN (spatial denoise) control algorithm
+ */
+
+#include "../noise_status.h"
+#include "../sdn_status.h"
+
+#include "sdn.hpp"
+
+using namespace RPi;
+
+// Calculate settings for the spatial denoise block using the noise profile in
+// the image metadata.
+
+#define NAME "rpi.sdn"
+
+Sdn::Sdn(Controller *controller)
+	: Algorithm(controller)
+{
+}
+
+char const *Sdn::Name() const
+{
+	return NAME;
+}
+
+void Sdn::Read(boost::property_tree::ptree const &params)
+{
+	deviation_ = params.get<double>("deviation", 3.2);
+	strength_ = params.get<double>("strength", 0.75);
+}
+
+void Sdn::Initialise() {}
+
+void Sdn::Prepare(Metadata *image_metadata)
+{
+	struct NoiseStatus noise_status = {};
+	noise_status.noise_slope = 3.0; // in case no metadata
+	if (image_metadata->Get("noise.status", noise_status) != 0)
+		RPI_WARN("Sdn: no noise profile found");
+	RPI_LOG("Noise profile: constant " << noise_status.noise_constant
+					   << " slope "
+					   << noise_status.noise_slope);
+	struct SdnStatus status;
+	status.noise_constant = noise_status.noise_constant * deviation_;
+	status.noise_slope = noise_status.noise_slope * deviation_;
+	status.strength = strength_;
+	image_metadata->Set("sdn.status", status);
+	RPI_LOG("Sdn: programmed constant " << status.noise_constant
+					    << " slope " << status.noise_slope
+					    << " strength "
+					    << status.strength);
+}
+
+// Register algorithm with the system.
+static Algorithm *Create(Controller *controller)
+{
+	return (Algorithm *)new Sdn(controller);
+}
+static RegisterAlgorithm reg(NAME, &Create);