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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021-2022, Ideas On Board
*
* blc.cpp - RkISP1 Black Level Correction control
*/
#include "blc.h"
#include <libcamera/base/log.h>
#include "libcamera/internal/yaml_parser.h"
/**
* \file blc.h
*/
namespace libcamera {
namespace ipa::rkisp1::algorithms {
/**
* \class BlackLevelCorrection
* \brief RkISP1 Black Level Correction control
*
* The pixels output by the camera normally include a black level, because
* sensors do not always report a signal level of '0' for black. Pixels at or
* below this level should be considered black. To achieve that, the RkISP BLC
* algorithm subtracts a configurable offset from all pixels.
*
* The black level can be measured at runtime from an optical dark region of the
* camera sensor, or measured during the camera tuning process. The first option
* isn't currently supported.
*/
LOG_DEFINE_CATEGORY(RkISP1Blc)
BlackLevelCorrection::BlackLevelCorrection()
: tuningParameters_(false)
{
}
/**
* \copydoc libcamera::ipa::Algorithm::init
*/
int BlackLevelCorrection::init([[maybe_unused]] IPAContext &context,
const YamlObject &tuningData)
{
blackLevelRed_ = tuningData["R"].get<int16_t>(256);
blackLevelGreenR_ = tuningData["Gr"].get<int16_t>(256);
blackLevelGreenB_ = tuningData["Gb"].get<int16_t>(256);
blackLevelBlue_ = tuningData["B"].get<int16_t>(256);
tuningParameters_ = true;
LOG(RkISP1Blc, Debug)
<< "Black levels: red " << blackLevelRed_
<< ", green (red) " << blackLevelGreenR_
<< ", green (blue) " << blackLevelGreenB_
<< ", blue " << blackLevelBlue_;
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void BlackLevelCorrection::prepare(IPAContext &context,
[[maybe_unused]] const uint32_t frame,
[[maybe_unused]] IPAFrameContext &frameContext,
rkisp1_params_cfg *params)
{
if (context.frameContext.frameCount > 0)
return;
if (!tuningParameters_)
return;
params->others.bls_config.enable_auto = 0;
params->others.bls_config.fixed_val.r = blackLevelRed_;
params->others.bls_config.fixed_val.gr = blackLevelGreenR_;
params->others.bls_config.fixed_val.gb = blackLevelGreenB_;
params->others.bls_config.fixed_val.b = blackLevelBlue_;
params->module_en_update |= RKISP1_CIF_ISP_MODULE_BLS;
params->module_ens |= RKISP1_CIF_ISP_MODULE_BLS;
params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_BLS;
}
REGISTER_IPA_ALGORITHM(BlackLevelCorrection, "BlackLevelCorrection")
} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */
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