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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi Ltd
*
* agc.h - AGC/AEC control algorithm
*/
#pragma once
#include <vector>
#include <mutex>
#include <libcamera/base/utils.h>
#include "../agc_algorithm.h"
#include "../agc_status.h"
#include "../pwl.h"
/* This is our implementation of AGC. */
/*
* This is the number actually set up by the firmware, not the maximum possible
* number (which is 16).
*/
constexpr unsigned int AgcStatsSize = 15;
namespace RPiController {
struct AgcMeteringMode {
double weights[AgcStatsSize];
void read(boost::property_tree::ptree const ¶ms);
};
struct AgcExposureMode {
std::vector<libcamera::utils::Duration> shutter;
std::vector<double> gain;
void read(boost::property_tree::ptree const ¶ms);
};
struct AgcConstraint {
enum class Bound { LOWER = 0, UPPER = 1 };
Bound bound;
double qLo;
double qHi;
Pwl yTarget;
void read(boost::property_tree::ptree const ¶ms);
};
typedef std::vector<AgcConstraint> AgcConstraintMode;
struct AgcConfig {
void read(boost::property_tree::ptree const ¶ms);
std::map<std::string, AgcMeteringMode> meteringModes;
std::map<std::string, AgcExposureMode> exposureModes;
std::map<std::string, AgcConstraintMode> constraintModes;
Pwl yTarget;
double speed;
uint16_t startupFrames;
unsigned int convergenceFrames;
double maxChange;
double minChange;
double fastReduceThreshold;
double speedUpThreshold;
std::string defaultMeteringMode;
std::string defaultExposureMode;
std::string defaultConstraintMode;
double baseEv;
libcamera::utils::Duration defaultExposureTime;
double defaultAnalogueGain;
};
class Agc : public AgcAlgorithm
{
public:
Agc(Controller *controller);
char const *name() const override;
void read(boost::property_tree::ptree const ¶ms) override;
/* AGC handles "pausing" for itself. */
bool isPaused() const override;
void pause() override;
void resume() override;
unsigned int getConvergenceFrames() const override;
void setEv(double ev) override;
void setFlickerPeriod(libcamera::utils::Duration flickerPeriod) override;
void setMaxShutter(libcamera::utils::Duration maxShutter) override;
void setFixedShutter(libcamera::utils::Duration fixedShutter) override;
void setFixedAnalogueGain(double fixedAnalogueGain) override;
void setMeteringMode(std::string const &meteringModeName) override;
void setExposureMode(std::string const &exposureModeName) override;
void setConstraintMode(std::string const &contraintModeName) override;
void switchMode(CameraMode const &cameraMode, Metadata *metadata) override;
void prepare(Metadata *imageMetadata) override;
void process(StatisticsPtr &stats, Metadata *imageMetadata) override;
private:
void updateLockStatus(DeviceStatus const &deviceStatus);
AgcConfig config_;
void housekeepConfig();
void fetchCurrentExposure(Metadata *imageMetadata);
void fetchAwbStatus(Metadata *imageMetadata);
void computeGain(bcm2835_isp_stats *statistics, Metadata *imageMetadata,
double &gain, double &targetY);
void computeTargetExposure(double gain);
bool applyDigitalGain(double gain, double targetY);
void filterExposure(bool desaturate);
void divideUpExposure();
void writeAndFinish(Metadata *imageMetadata, bool desaturate);
libcamera::utils::Duration clipShutter(libcamera::utils::Duration shutter);
AgcMeteringMode *meteringMode_;
AgcExposureMode *exposureMode_;
AgcConstraintMode *constraintMode_;
uint64_t frameCount_;
AwbStatus awb_;
struct ExposureValues {
ExposureValues();
libcamera::utils::Duration shutter;
double analogueGain;
libcamera::utils::Duration totalExposure;
libcamera::utils::Duration totalExposureNoDG; /* without digital gain */
};
ExposureValues current_; /* values for the current frame */
ExposureValues target_; /* calculate the values we want here */
ExposureValues filtered_; /* these values are filtered towards target */
AgcStatus status_;
int lockCount_;
DeviceStatus lastDeviceStatus_;
libcamera::utils::Duration lastTargetExposure_;
double lastSensitivity_; /* sensitivity of the previous camera mode */
/* Below here the "settings" that applications can change. */
std::string meteringModeName_;
std::string exposureModeName_;
std::string constraintModeName_;
double ev_;
libcamera::utils::Duration flickerPeriod_;
libcamera::utils::Duration maxShutter_;
libcamera::utils::Duration fixedShutter_;
double fixedAnalogueGain_;
};
} /* namespace RPiController */
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