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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021-2022, Ideas On Board
*
* RkISP1 Black Level Correction control
*/
#include "blc.h"
#include <linux/videodev2.h>
#include <libcamera/base/log.h>
#include <libcamera/control_ids.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()
{
/*
* This is a bit of a hack. In raw mode no black level correction
* happens. This flag is used to ensure the metadata gets populated with
* the black level which is needed to capture proper raw images for
* tuning.
*/
supportsRaw_ = true;
}
/**
* \copydoc libcamera::ipa::Algorithm::init
*/
int BlackLevelCorrection::init(IPAContext &context, const YamlObject &tuningData)
{
std::optional<int16_t> levelRed = tuningData["R"].get<int16_t>();
std::optional<int16_t> levelGreenR = tuningData["Gr"].get<int16_t>();
std::optional<int16_t> levelGreenB = tuningData["Gb"].get<int16_t>();
std::optional<int16_t> levelBlue = tuningData["B"].get<int16_t>();
bool tuningHasLevels = levelRed && levelGreenR && levelGreenB && levelBlue;
auto blackLevel = context.camHelper->blackLevel();
if (!blackLevel) {
/*
* Not all camera sensor helpers have been updated with black
* levels. Print a warning and fall back to the levels from the
* tuning data to preserve backward compatibility. This should
* be removed once all helpers provide the data.
*/
LOG(RkISP1Blc, Warning)
<< "No black levels provided by camera sensor helper"
<< ", please fix";
blackLevelRed_ = levelRed.value_or(4096);
blackLevelGreenR_ = levelGreenR.value_or(4096);
blackLevelGreenB_ = levelGreenB.value_or(4096);
blackLevelBlue_ = levelBlue.value_or(4096);
} else if (tuningHasLevels) {
/*
* If black levels are provided in the tuning file, use them to
* avoid breaking existing camera tuning. This is deprecated and
* will be removed.
*/
LOG(RkISP1Blc, Warning)
<< "Deprecated: black levels overwritten by tuning file";
blackLevelRed_ = *levelRed;
blackLevelGreenR_ = *levelGreenR;
blackLevelGreenB_ = *levelGreenB;
blackLevelBlue_ = *levelBlue;
} else {
blackLevelRed_ = *blackLevel;
blackLevelGreenR_ = *blackLevel;
blackLevelGreenB_ = *blackLevel;
blackLevelBlue_ = *blackLevel;
}
LOG(RkISP1Blc, Debug)
<< "Black levels: red " << blackLevelRed_
<< ", green (red) " << blackLevelGreenR_
<< ", green (blue) " << blackLevelGreenB_
<< ", blue " << blackLevelBlue_;
return 0;
}
int BlackLevelCorrection::configure(IPAContext &context,
[[maybe_unused]] const IPACameraSensorInfo &configInfo)
{
/*
* BLC on ISP versions that include the companding block requires usage
* of the extensible parameters format.
*/
supported_ = context.configuration.paramFormat == V4L2_META_FMT_RK_ISP1_EXT_PARAMS ||
!context.hw->compand;
if (!supported_)
LOG(RkISP1Blc, Warning)
<< "BLC in companding block requires extensible parameters";
return 0;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void BlackLevelCorrection::prepare(IPAContext &context,
const uint32_t frame,
[[maybe_unused]] IPAFrameContext &frameContext,
RkISP1Params *params)
{
if (context.configuration.raw)
return;
if (frame > 0)
return;
if (!supported_)
return;
if (context.hw->compand) {
auto config = params->block<BlockType::CompandBls>();
config.setEnabled(true);
/*
* Scale up to the 20-bit black levels used by the companding
* block.
*/
config->r = blackLevelRed_ << 4;
config->gr = blackLevelGreenR_ << 4;
config->gb = blackLevelGreenB_ << 4;
config->b = blackLevelBlue_ << 4;
} else {
auto config = params->block<BlockType::Bls>();
config.setEnabled(true);
config->enable_auto = 0;
/* Scale down to the 12-bit black levels used by the BLS block. */
config->fixed_val.r = blackLevelRed_ >> 4;
config->fixed_val.gr = blackLevelGreenR_ >> 4;
config->fixed_val.gb = blackLevelGreenB_ >> 4;
config->fixed_val.b = blackLevelBlue_ >> 4;
}
}
/**
* \copydoc libcamera::ipa::Algorithm::process
*/
void BlackLevelCorrection::process([[maybe_unused]] IPAContext &context,
[[maybe_unused]] const uint32_t frame,
[[maybe_unused]] IPAFrameContext &frameContext,
[[maybe_unused]] const rkisp1_stat_buffer *stats,
ControlList &metadata)
{
metadata.set(controls::SensorBlackLevels,
{ static_cast<int32_t>(blackLevelRed_),
static_cast<int32_t>(blackLevelGreenR_),
static_cast<int32_t>(blackLevelGreenB_),
static_cast<int32_t>(blackLevelBlue_) });
}
REGISTER_IPA_ALGORITHM(BlackLevelCorrection, "BlackLevelCorrection")
} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */
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