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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021-2022, Ideas On Board
*
* lsc.cpp - RkISP1 Lens Shading Correction control
*/
#include "lsc.h"
#include <cmath>
#include <numeric>
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include "libcamera/internal/yaml_parser.h"
#include "linux/rkisp1-config.h"
/**
* \file lsc.h
*/
namespace libcamera {
namespace ipa::rkisp1::algorithms {
/**
* \class LensShadingCorrection
* \brief RkISP1 Lens Shading Correction control
*
* Due to the optical characteristics of the lens, the light intensity received
* by the sensor is not uniform.
*
* The Lens Shading Correction algorithm applies multipliers to all pixels
* to compensate for the lens shading effect. The coefficients are
* specified in a downscaled table in the YAML tuning file.
*/
LOG_DEFINE_CATEGORY(RkISP1Lsc)
static std::vector<double> parseSizes(const YamlObject &tuningData,
const char *prop)
{
std::vector<double> sizes =
tuningData[prop].getList<double>().value_or(utils::defopt);
if (sizes.size() != RKISP1_CIF_ISP_LSC_SECTORS_TBL_SIZE) {
LOG(RkISP1Lsc, Error)
<< "Invalid '" << prop << "' values: expected "
<< RKISP1_CIF_ISP_LSC_SECTORS_TBL_SIZE
<< " elements, got " << sizes.size();
return {};
}
/*
* The sum of all elements must be 0.5 to satisfy hardware constraints.
* Validate it here, allowing a 1% tolerance as rounding errors may
* prevent an exact match (further adjustments will be performed in
* LensShadingCorrection::prepare()).
*/
double sum = std::accumulate(sizes.begin(), sizes.end(), 0.0);
if (sum < 0.495 || sum > 0.505) {
LOG(RkISP1Lsc, Error)
<< "Invalid '" << prop << "' values: sum of the elements"
<< " should be 0.5, got " << sum;
return {};
}
return sizes;
}
static std::vector<uint16_t> parseTable(const YamlObject &tuningData,
const char *prop)
{
static constexpr unsigned int kLscNumSamples =
RKISP1_CIF_ISP_LSC_SAMPLES_MAX * RKISP1_CIF_ISP_LSC_SAMPLES_MAX;
std::vector<uint16_t> table =
tuningData[prop].getList<uint16_t>().value_or(utils::defopt);
if (table.size() != kLscNumSamples) {
LOG(RkISP1Lsc, Error)
<< "Invalid '" << prop << "' values: expected "
<< kLscNumSamples
<< " elements, got " << table.size();
return {};
}
return table;
}
LensShadingCorrection::LensShadingCorrection()
: initialized_(false)
{
}
/**
* \copydoc libcamera::ipa::Algorithm::init
*/
int LensShadingCorrection::init([[maybe_unused]] IPAContext &context,
const YamlObject &tuningData)
{
xSize_ = parseSizes(tuningData, "x-size");
ySize_ = parseSizes(tuningData, "y-size");
if (xSize_.empty() || ySize_.empty())
return -EINVAL;
rData_ = parseTable(tuningData, "r");
grData_ = parseTable(tuningData, "gr");
gbData_ = parseTable(tuningData, "gb");
bData_ = parseTable(tuningData, "b");
if (rData_.empty() || grData_.empty() ||
gbData_.empty() || bData_.empty())
return -EINVAL;
initialized_ = true;
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::configure
*/
int LensShadingCorrection::configure(IPAContext &context,
[[maybe_unused]] const IPACameraSensorInfo &configInfo)
{
context.configuration.lsc.enabled = initialized_;
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void LensShadingCorrection::prepare(IPAContext &context,
rkisp1_params_cfg *params)
{
if (context.frameContext.frameCount > 0)
return;
if (!initialized_)
return;
struct rkisp1_cif_isp_lsc_config &config = params->others.lsc_config;
const Size &size = context.configuration.sensor.size;
Size totalSize{};
for (unsigned int i = 0; i < RKISP1_CIF_ISP_LSC_SECTORS_TBL_SIZE; ++i) {
config.x_size_tbl[i] = xSize_[i] * size.width;
config.y_size_tbl[i] = ySize_[i] * size.height;
/*
* To prevent unexpected behavior of the ISP, the sum of x_size_tbl and
* y_size_tbl items shall be equal to respectively size.width/2 and
* size.height/2. Enforce it by computing the last tables value to avoid
* rounding-induced errors.
*/
if (i == RKISP1_CIF_ISP_LSC_SECTORS_TBL_SIZE - 1) {
config.x_size_tbl[i] = size.width / 2 - totalSize.width;
config.y_size_tbl[i] = size.height / 2 - totalSize.height;
}
totalSize.width += config.x_size_tbl[i];
totalSize.height += config.y_size_tbl[i];
config.x_grad_tbl[i] = std::round(32768 / config.x_size_tbl[i]);
config.y_grad_tbl[i] = std::round(32768 / config.y_size_tbl[i]);
}
std::copy(rData_.begin(), rData_.end(),
¶ms->others.lsc_config.r_data_tbl[0][0]);
std::copy(grData_.begin(), grData_.end(),
¶ms->others.lsc_config.gr_data_tbl[0][0]);
std::copy(gbData_.begin(), gbData_.end(),
¶ms->others.lsc_config.gb_data_tbl[0][0]);
std::copy(bData_.begin(), bData_.end(),
¶ms->others.lsc_config.b_data_tbl[0][0]);
params->module_en_update |= RKISP1_CIF_ISP_MODULE_LSC;
params->module_ens |= RKISP1_CIF_ISP_MODULE_LSC;
params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_LSC;
}
REGISTER_IPA_ALGORITHM(LensShadingCorrection, "LensShadingCorrection")
} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */
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