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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2024 Ideas on Board Oy
*
agc_mean_luminance.h - Base class for mean luminance AGC algorithms
*/
#pragma once
#include <map>
#include <memory>
#include <tuple>
#include <vector>
#include <libcamera/base/utils.h>
#include <libcamera/controls.h>
#include "libcamera/internal/yaml_parser.h"
#include "exposure_mode_helper.h"
#include "histogram.h"
namespace libcamera {
namespace ipa {
class AgcMeanLuminance
{
public:
AgcMeanLuminance();
virtual ~AgcMeanLuminance();
struct AgcConstraint {
enum class Bound {
Lower = 0,
Upper = 1
};
Bound bound;
double qLo;
double qHi;
double yTarget;
};
int parseTuningData(const YamlObject &tuningData);
void setLimits(utils::Duration minExposureTime, utils::Duration maxExposureTime,
double minGain, double maxGain);
std::map<int32_t, std::vector<AgcConstraint>> constraintModes()
{
return constraintModes_;
}
std::map<int32_t, std::shared_ptr<ExposureModeHelper>> exposureModeHelpers()
{
return exposureModeHelpers_;
}
ControlInfoMap::Map controls()
{
return controls_;
}
std::tuple<utils::Duration, double, double>
calculateNewEv(uint32_t constraintModeIndex, uint32_t exposureModeIndex,
const Histogram &yHist, utils::Duration effectiveExposureValue);
void resetFrameCount()
{
frameCount_ = 0;
}
private:
virtual double estimateLuminance(const double gain) const = 0;
void parseRelativeLuminanceTarget(const YamlObject &tuningData);
void parseConstraint(const YamlObject &modeDict, int32_t id);
int parseConstraintModes(const YamlObject &tuningData);
int parseExposureModes(const YamlObject &tuningData);
double estimateInitialGain() const;
double constraintClampGain(uint32_t constraintModeIndex,
const Histogram &hist,
double gain);
utils::Duration filterExposure(utils::Duration exposureValue);
uint64_t frameCount_;
utils::Duration filteredExposure_;
double relativeLuminanceTarget_;
std::map<int32_t, std::vector<AgcConstraint>> constraintModes_;
std::map<int32_t, std::shared_ptr<ExposureModeHelper>> exposureModeHelpers_;
ControlInfoMap::Map controls_;
};
} /* namespace ipa */
} /* namespace libcamera */
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