agc.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021, Ideas On Board
 *
 * agc.h - IPU3 AGC/AEC mean-based control algorithm
 */
 
#pragma once
 
#include <linux/intel-ipu3.h>
 
#include <libcamera/base/utils.h>
 
#include <libcamera/geometry.h>
 
#include "algorithm.h"
 
namespace libcamera {
 
struct IPACameraSensorInfo;
 
namespace ipa::ipu3::algorithms {
 
class Agc : public Algorithm
{
public:
    Agc();
    ~Agc() = default;
 
    int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
    void process(IPAContext &context, const uint32_t frame,
             IPAFrameContext &frameContext,
             const ipu3_uapi_stats_3a *stats,
             ControlList &metadata) override;
 
private:
    double measureBrightness(const ipu3_uapi_stats_3a *stats,
                 const ipu3_uapi_grid_config &grid) const;
    utils::Duration filterExposure(utils::Duration currentExposure);
    void computeExposure(IPAContext &context, IPAFrameContext &frameContext,
                 double yGain, double iqMeanGain);
    double estimateLuminance(IPAActiveState &activeState,
                 const ipu3_uapi_grid_config &grid,
                 const ipu3_uapi_stats_3a *stats,
                 double gain);
 
    uint64_t frameCount_;
 
    utils::Duration minShutterSpeed_;
    utils::Duration maxShutterSpeed_;
 
    double minAnalogueGain_;
    double maxAnalogueGain_;
 
    utils::Duration filteredExposure_;
 
    uint32_t stride_;
};
 
} /* namespace ipa::ipu3::algorithms */
 
} /* namespace libcamera */