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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* alsc.hpp - ALSC (auto lens shading correction) control algorithm
*/
#pragma once
#include <mutex>
#include <condition_variable>
#include <thread>
#include "../algorithm.hpp"
#include "../alsc_status.h"
namespace RPiController {
// Algorithm to generate automagic LSC (Lens Shading Correction) tables.
struct AlscCalibration {
double ct;
double table[ALSC_CELLS_X * ALSC_CELLS_Y];
};
struct AlscConfig {
// Only repeat the ALSC calculation every "this many" frames
uint16_t frame_period;
// number of initial frames for which speed taken as 1.0 (maximum)
uint16_t startup_frames;
// IIR filter speed applied to algorithm results
double speed;
double sigma_Cr;
double sigma_Cb;
double min_count;
uint16_t min_G;
double omega;
uint32_t n_iter;
double luminance_lut[ALSC_CELLS_X * ALSC_CELLS_Y];
double luminance_strength;
std::vector<AlscCalibration> calibrations_Cr;
std::vector<AlscCalibration> calibrations_Cb;
double default_ct; // colour temperature if no metadata found
double threshold; // iteration termination threshold
double lambda_bound; // upper/lower bound for lambda from a value of 1
};
class Alsc : public Algorithm
{
public:
Alsc(Controller *controller = NULL);
~Alsc();
char const *Name() const override;
void Initialise() override;
void SwitchMode(CameraMode const &camera_mode, Metadata *metadata) override;
void Read(boost::property_tree::ptree const ¶ms) override;
void Prepare(Metadata *image_metadata) override;
void Process(StatisticsPtr &stats, Metadata *image_metadata) override;
private:
// configuration is read-only, and available to both threads
AlscConfig config_;
bool first_time_;
CameraMode camera_mode_;
double luminance_table_[ALSC_CELLS_X * ALSC_CELLS_Y];
std::thread async_thread_;
void asyncFunc(); // asynchronous thread function
std::mutex mutex_;
// condvar for async thread to wait on
std::condition_variable async_signal_;
// condvar for synchronous thread to wait on
std::condition_variable sync_signal_;
// for sync thread to check if async thread finished (requires mutex)
bool async_finished_;
// for async thread to check if it's been told to run (requires mutex)
bool async_start_;
// for async thread to check if it's been told to quit (requires mutex)
bool async_abort_;
// The following are only for the synchronous thread to use:
// for sync thread to note its has asked async thread to run
bool async_started_;
// counts up to frame_period before restarting the async thread
int frame_phase_;
// counts up to startup_frames
int frame_count_;
// counts up to startup_frames for Process function
int frame_count2_;
double sync_results_[3][ALSC_CELLS_Y][ALSC_CELLS_X];
double prev_sync_results_[3][ALSC_CELLS_Y][ALSC_CELLS_X];
void waitForAysncThread();
// The following are for the asynchronous thread to use, though the main
// thread can set/reset them if the async thread is known to be idle:
void restartAsync(StatisticsPtr &stats, Metadata *image_metadata);
// copy out the results from the async thread so that it can be restarted
void fetchAsyncResults();
double ct_;
bcm2835_isp_stats_region statistics_[ALSC_CELLS_Y * ALSC_CELLS_X];
double async_results_[3][ALSC_CELLS_Y][ALSC_CELLS_X];
double async_lambda_r_[ALSC_CELLS_X * ALSC_CELLS_Y];
double async_lambda_b_[ALSC_CELLS_X * ALSC_CELLS_Y];
void doAlsc();
double lambda_r_[ALSC_CELLS_X * ALSC_CELLS_Y];
double lambda_b_[ALSC_CELLS_X * ALSC_CELLS_Y];
};
} // namespace RPiController
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