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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2023, Raspberry Pi Ltd
*
* hdr.h - HDR control algorithm
*/
#pragma once
#include <map>
#include <string>
#include <vector>
#include "../hdr_algorithm.h"
#include "../hdr_status.h"
#include "../pwl.h"
/* This is our implementation of an HDR algorithm. */
namespace RPiController {
struct HdrConfig {
std::string name;
std::vector<unsigned int> cadence;
std::map<unsigned int, std::string> channelMap;
/* Tonemap related parameters. */
bool tonemapEnable;
uint16_t detailConstant;
double detailSlope;
double iirStrength;
double strength;
/* We must have either an explicit tonemap curve, or the other parameters. */
Pwl tonemap;
Pwl target; /* maps histogram quatile to desired target output value */
Pwl maxSlope; /* the maximum slope allowed at each point in the mapping */
double minSlope; /* the minimum allowed slope */
double maxGain; /* limit to the max absolute gain */
double step; /* the histogram granularity for building the mapping */
double speed; /* rate at which tonemap is updated */
/* Stitch related parameters. */
bool stitchEnable;
uint16_t thresholdLo;
uint8_t diffPower;
double motionThreshold;
void read(const libcamera::YamlObject ¶ms, const std::string &name);
};
class Hdr : public HdrAlgorithm
{
public:
Hdr(Controller *controller);
char const *name() const override;
void switchMode(CameraMode const &cameraMode, Metadata *metadata) override;
int read(const libcamera::YamlObject ¶ms) override;
void process(StatisticsPtr &stats, Metadata *imageMetadata) override;
int setMode(std::string const &mode) override;
std::vector<unsigned int> getChannels() const override;
private:
void updateAgcStatus(Metadata *metadata);
bool updateTonemap(StatisticsPtr &stats, HdrConfig &config);
std::map<std::string, HdrConfig> config_;
HdrStatus status_; /* track the current HDR mode and channel */
HdrStatus delayedStatus_; /* track the delayed HDR mode and channel */
std::string previousMode_;
Pwl tonemap_;
};
} /* namespace RPiController */
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