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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2023, Raspberry Pi Ltd
*
* agc_channel.h - AGC/AEC control algorithm
*/
#pragma once
#include <map>
#include <string>
#include <vector>
#include <libcamera/base/utils.h>
#include "../agc_status.h"
#include "../awb_status.h"
#include "../controller.h"
#include "../pwl.h"
/* This is our implementation of AGC. */
namespace RPiController {
using AgcChannelTotalExposures = std::vector<libcamera::utils::Duration>;
struct AgcMeteringMode {
std::vector<double> weights;
int read(const libcamera::YamlObject ¶ms);
};
struct AgcExposureMode {
std::vector<libcamera::utils::Duration> shutter;
std::vector<double> gain;
int read(const libcamera::YamlObject ¶ms);
};
struct AgcConstraint {
enum class Bound { LOWER = 0,
UPPER = 1 };
Bound bound;
double qLo;
double qHi;
Pwl yTarget;
int read(const libcamera::YamlObject ¶ms);
};
typedef std::vector<AgcConstraint> AgcConstraintMode;
struct AgcChannelConstraint {
enum class Bound { LOWER = 0,
UPPER = 1 };
Bound bound;
unsigned int channel;
double factor;
int read(const libcamera::YamlObject ¶ms);
};
struct AgcConfig {
int read(const libcamera::YamlObject ¶ms);
std::map<std::string, AgcMeteringMode> meteringModes;
std::map<std::string, AgcExposureMode> exposureModes;
std::map<std::string, AgcConstraintMode> constraintModes;
std::vector<AgcChannelConstraint> channelConstraints;
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;
double stableRegion;
bool desaturate;
};
class AgcChannel
{
public:
AgcChannel();
int read(const libcamera::YamlObject ¶ms,
const Controller::HardwareConfig &hardwareConfig);
unsigned int getConvergenceFrames() const;
std::vector<double> const &getWeights() const;
void setEv(double ev);
void setFlickerPeriod(libcamera::utils::Duration flickerPeriod);
void setMaxShutter(libcamera::utils::Duration maxShutter);
void setFixedShutter(libcamera::utils::Duration fixedShutter);
void setFixedAnalogueGain(double fixedAnalogueGain);
void setMeteringMode(std::string const &meteringModeName);
void setExposureMode(std::string const &exposureModeName);
void setConstraintMode(std::string const &contraintModeName);
void enableAuto();
void disableAuto();
void switchMode(CameraMode const &cameraMode, Metadata *metadata);
void prepare(Metadata *imageMetadata);
void process(StatisticsPtr &stats, DeviceStatus const &deviceStatus, Metadata *imageMetadata,
const AgcChannelTotalExposures &channelTotalExposures);
private:
bool updateLockStatus(DeviceStatus const &deviceStatus);
AgcConfig config_;
void housekeepConfig();
void fetchCurrentExposure(DeviceStatus const &deviceStatus);
void fetchAwbStatus(Metadata *imageMetadata);
void computeGain(StatisticsPtr &statistics, Metadata *imageMetadata,
double &gain, double &targetY);
void computeTargetExposure(double gain);
void filterExposure();
bool applyChannelConstraints(const AgcChannelTotalExposures &channelTotalExposures);
bool applyDigitalGain(double gain, double targetY, bool channelBound);
void divideUpExposure();
void writeAndFinish(Metadata *imageMetadata, bool desaturate);
libcamera::utils::Duration limitShutter(libcamera::utils::Duration shutter);
double limitGain(double gain) const;
AgcMeteringMode *meteringMode_;
AgcExposureMode *exposureMode_;
AgcConstraintMode *constraintMode_;
CameraMode mode_;
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_;
/* 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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