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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2024, Ideas On Board
*
* RkISP1 Color Correction Matrix control algorithm
*/
#include "ccm.h"
#include <map>
#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(struct rkisp1_cif_isp_ctk_config &config,
const Matrix<float, 3, 3> &matrix,
const Matrix<int16_t, 3, 1> &offsets)
{
/*
* 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;
}
/**
* \copydoc libcamera::ipa::Algorithm::prepare
*/
void Ccm::prepare(IPAContext &context, const uint32_t frame,
IPAFrameContext &frameContext, RkISP1Params *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_) {
frameContext.ccm.ccm = context.activeState.ccm.ccm;
return;
}
ct_ = ct;
Matrix<float, 3, 3> ccm = ccm_.get(ct);
Matrix<int16_t, 3, 1> offsets = offsets_.get(ct);
context.activeState.ccm.ccm = ccm;
frameContext.ccm.ccm = ccm;
auto config = params->block<BlockType::Ctk>();
config.setEnabled(true);
setParameters(*config, 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 * 3 + j] = frameContext.ccm.ccm[i][j];
}
metadata.set(controls::ColourCorrectionMatrix, m);
}
REGISTER_IPA_ALGORITHM(Ccm, "Ccm")
} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */
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