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authorFlorian Sylvestre <fsylvestre@baylibre.com>2022-07-27 10:40:49 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-07-28 14:54:50 +0300
commita9bffb72221b43e49cdb60f0f6d663d973056011 (patch)
tree76d3b224b635ddc6b1361e37cfcbc6ab0d15dfe9 /src/ipa/rkisp1/algorithms/gsl.cpp
parent03b555a901cd5bcca007e3fc8b9170b5e19420a4 (diff)
ipa: rkisp1: Add support of Gamma Sensor Linearization control
The GammaSensorLinearization algorithm linearizes the sensor output to compensate the sensor non-linearities by applying piecewise linear functions to the red, green and blue channels. Signed-off-by: Florian Sylvestre <fsylvestre@baylibre.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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diff --git a/src/ipa/rkisp1/algorithms/gsl.cpp b/src/ipa/rkisp1/algorithms/gsl.cpp
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * gsl.cpp - RkISP1 Gamma Sensor Linearization control
+ */
+
+#include "gsl.h"
+
+#include <libcamera/base/log.h>
+#include <libcamera/base/utils.h>
+
+#include "libcamera/internal/yaml_parser.h"
+
+#include "linux/rkisp1-config.h"
+
+/**
+ * \file gsl.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+/**
+ * \class GammaSensorLinearization
+ * \brief RkISP1 Gamma Sensor Linearization control
+ *
+ * This algorithm linearizes the sensor output to compensate the sensor
+ * non-linearities by applying piecewise linear functions to the red, green and
+ * blue channels.
+ *
+ * The curves are specified in the tuning data and defined using 17 points.
+ *
+ * - The X coordinates are expressed using 16 intervals, with the first point
+ * at X coordinate 0. Each interval is expressed as a 2-bit value DX (from
+ * GAMMA_DX_1 to GAMMA_DX_16), stored in the RKISP1_CIF_ISP_GAMMA_DX_LO and
+ * RKISP1_CIF_ISP_GAMMA_DX_HI registers. The real interval is equal to
+ * \f$2^{dx+4}\f$. X coordinates are shared between the red, green and blue
+ * curves.
+ *
+ * - The Y coordinates are specified as 17 values separately for the
+ * red, green and blue channels, with a 12-bit resolution. Each value must be
+ * in the [-2048, 2047] range compared to the previous value.
+ */
+
+LOG_DEFINE_CATEGORY(RkISP1Gsl)
+
+static constexpr unsigned int kDegammaXIntervals = 16;
+
+GammaSensorLinearization::GammaSensorLinearization()
+ : initialized_(false)
+{
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::init
+ */
+int GammaSensorLinearization::init([[maybe_unused]] IPAContext &context,
+ const YamlObject &tuningData)
+{
+ std::vector<uint16_t> xIntervals =
+ tuningData["x-intervals"].getList<uint16_t>().value_or(utils::defopt);
+ if (xIntervals.size() != kDegammaXIntervals) {
+ LOG(RkISP1Gsl, Error)
+ << "Invalid 'x' coordinates: expected "
+ << kDegammaXIntervals << " elements, got "
+ << xIntervals.size();
+
+ return -EINVAL;
+ }
+
+ /* Compute gammaDx_ intervals from xIntervals values */
+ gammaDx_[0] = 0;
+ gammaDx_[1] = 0;
+ for (unsigned int i = 0; i < kDegammaXIntervals; ++i)
+ gammaDx_[i / 8] |= (xIntervals[i] & 0x07) << ((i % 8) * 4);
+
+ const YamlObject &yObject = tuningData["y"];
+ if (!yObject.isDictionary()) {
+ LOG(RkISP1Gsl, Error)
+ << "Issue while parsing 'y' in tuning file: "
+ << "entry must be a dictionary";
+ return -EINVAL;
+ }
+
+ curveYr_ = yObject["red"].getList<uint16_t>().value_or(utils::defopt);
+ if (curveYr_.size() != RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE) {
+ LOG(RkISP1Gsl, Error)
+ << "Invalid 'y:red' coordinates: expected "
+ << RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE
+ << " elements, got " << curveYr_.size();
+ return -EINVAL;
+ }
+
+ curveYg_ = yObject["green"].getList<uint16_t>().value_or(utils::defopt);
+ if (curveYg_.size() != RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE) {
+ LOG(RkISP1Gsl, Error)
+ << "Invalid 'y:green' coordinates: expected "
+ << RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE
+ << " elements, got " << curveYg_.size();
+ return -EINVAL;
+ }
+
+ curveYb_ = yObject["blue"].getList<uint16_t>().value_or(utils::defopt);
+ if (curveYb_.size() != RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE) {
+ LOG(RkISP1Gsl, Error)
+ << "Invalid 'y:blue' coordinates: expected "
+ << RKISP1_CIF_ISP_DEGAMMA_CURVE_SIZE
+ << " elements, got " << curveYb_.size();
+ return -EINVAL;
+ }
+
+ initialized_ = true;
+ return 0;
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::prepare
+ */
+void GammaSensorLinearization::prepare(IPAContext &context,
+ rkisp1_params_cfg *params)
+{
+ if (context.frameContext.frameCount > 0)
+ return;
+
+ if (!initialized_)
+ return;
+
+ params->others.sdg_config.xa_pnts.gamma_dx0 = gammaDx_[0];
+ params->others.sdg_config.xa_pnts.gamma_dx1 = gammaDx_[1];
+
+ std::copy(curveYr_.begin(), curveYr_.end(),
+ params->others.sdg_config.curve_r.gamma_y);
+ std::copy(curveYg_.begin(), curveYg_.end(),
+ params->others.sdg_config.curve_g.gamma_y);
+ std::copy(curveYb_.begin(), curveYb_.end(),
+ params->others.sdg_config.curve_b.gamma_y);
+
+ params->module_en_update |= RKISP1_CIF_ISP_MODULE_SDG;
+ params->module_ens |= RKISP1_CIF_ISP_MODULE_SDG;
+ params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_SDG;
+}
+
+REGISTER_IPA_ALGORITHM(GammaSensorLinearization, "GammaSensorLinearization")
+
+} /* namespace ipa::rkisp1::algorithms */
+
+} /* namespace libcamera */