ipa: rkisp1: algorithms: Add crosstalk algorithm

Add an algorithm module to the rkisp1 IPA for crosstalk correction.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 147 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/algorithms/ccm.cpp b/src/ipa/rkisp1/algorithms/ccm.cpp
new file mode 100644
index 00000000..c1f5403a
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/ccm.cpp
@@ -0,0 +1,147 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024, Ideas On Board
+ *
+ * RkISP1 Color Correction Matrix control algorithm
+ */
+
+#include "ccm.h"
+
+#include <algorithm>
+#include <chrono>
+#include <cmath>
+#include <tuple>
+#include <vector>
+
+#include <libcamera/base/log.h>
+#include <libcamera/base/utils.h>
+
+#include <libcamera/control_ids.h>
+
+#include <libcamera/ipa/core_ipa_interface.h>
+
+#include "libcamera/internal/yaml_parser.h"
+
+#include "../utils.h"
+#include "libipa/matrix_interpolator.h"
+
+/**
+ * \file ccm.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+/**
+ * \class Ccm
+ * \brief A color correction matrix algorithm
+ */
+
+LOG_DEFINE_CATEGORY(RkISP1Ccm)
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::init
+ */
+int Ccm::init([[maybe_unused]] IPAContext &context, const YamlObject &tuningData)
+{
+	int ret = ccm_.readYaml(tuningData["ccms"], "ct", "ccm");
+	if (ret < 0) {
+		LOG(RkISP1Ccm, Warning)
+			<< "Failed to parse 'ccm' "
+			<< "parameter from tuning file; falling back to unit matrix";
+		ccm_.reset();
+	}
+
+	ret = offsets_.readYaml(tuningData["ccms"], "ct", "offsets");
+	if (ret < 0) {
+		LOG(RkISP1Ccm, Warning)
+			<< "Failed to parse 'offsets' "
+			<< "parameter from tuning file; falling back to zero offsets";
+		/*
+		 * MatrixInterpolator::reset() resets to identity matrices
+		 * while here we need zero matrices so we need to construct it
+		 * ourselves.
+		 */
+		Matrix<int16_t, 3, 1> m({ 0, 0, 0 });
+		std::map<unsigned int, Matrix<int16_t, 3, 1>> matrices = { { 0, m } };
+		offsets_ = MatrixInterpolator<int16_t, 3, 1>(matrices);
+	}
+
+	return 0;
+}
+
+void Ccm::setParameters(rkisp1_params_cfg *params,
+			const Matrix<float, 3, 3> &matrix,
+			const Matrix<int16_t, 3, 1> &offsets)
+{
+	struct rkisp1_cif_isp_ctk_config &config = params->others.ctk_config;
+
+	/*
+	 * 4 bit integer and 7 bit fractional, ranging from -8 (0x400) to
+	 * +7.992 (0x3ff)
+	 */
+	for (unsigned int i = 0; i < 3; i++) {
+		for (unsigned int j = 0; j < 3; j++)
+			config.coeff[i][j] =
+				utils::floatingToFixedPoint<4, 7, uint16_t, double>(matrix[i][j]);
+	}
+
+	for (unsigned int i = 0; i < 3; i++)
+		config.ct_offset[i] = offsets[i][0] & 0xfff;
+
+	LOG(RkISP1Ccm, Debug) << "Setting matrix " << matrix;
+	LOG(RkISP1Ccm, Debug) << "Setting offsets " << offsets;
+
+	params->module_en_update |= RKISP1_CIF_ISP_MODULE_CTK;
+	params->module_ens |= RKISP1_CIF_ISP_MODULE_CTK;
+	params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_CTK;
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::prepare
+ */
+void Ccm::prepare(IPAContext &context, const uint32_t frame,
+		  IPAFrameContext &frameContext,
+		  rkisp1_params_cfg *params)
+{
+	uint32_t ct = context.activeState.awb.temperatureK;
+
+	/*
+	 * \todo The colour temperature will likely be noisy, add filtering to
+	 * avoid updating the CCM matrix all the time.
+	 */
+	if (frame > 0 && ct == ct_)
+		return;
+
+	ct_ = ct;
+	Matrix<float, 3, 3> ccm = ccm_.get(ct);
+	Matrix<int16_t, 3, 1> offsets = offsets_.get(ct);
+
+	frameContext.ccm.ccm = ccm;
+
+	setParameters(params, ccm, offsets);
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::process
+ */
+void Ccm::process([[maybe_unused]] IPAContext &context,
+		  [[maybe_unused]] const uint32_t frame,
+		  IPAFrameContext &frameContext,
+		  [[maybe_unused]] const rkisp1_stat_buffer *stats,
+		  ControlList &metadata)
+{
+	float m[9];
+	for (unsigned int i = 0; i < 3; i++) {
+		for (unsigned int j = 0; j < 3; j++)
+			m[i] = frameContext.ccm.ccm[i][j];
+	}
+	metadata.set(controls::ColourCorrectionMatrix, m);
+}
+
+REGISTER_IPA_ALGORITHM(Ccm, "Ccm")
+
+} /* namespace ipa::rkisp1::algorithms */
+
+} /* namespace libcamera */