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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2020, Raspberry Pi Ltd
*
* cam_helper_imx296.cpp - Camera helper for IMX296 sensor
*/
#include <algorithm>
#include <cmath>
#include <stddef.h>
#include "cam_helper.h"
using namespace RPiController;
using libcamera::utils::Duration;
using namespace std::literals::chrono_literals;
class CamHelperImx296 : public CamHelper
{
public:
CamHelperImx296();
uint32_t gainCode(double gain) const override;
double gain(uint32_t gainCode) const override;
uint32_t exposureLines(const Duration exposure, const Duration lineLength) const override;
Duration exposure(uint32_t exposureLines, const Duration lineLength) const override;
void getDelays(int &exposureDelay, int &gainDelay, int &vblankDelay) const override;
private:
static constexpr uint32_t minExposureLines = 1;
static constexpr uint32_t maxGainCode = 239;
static constexpr Duration timePerLine = 550.0 / 37.125e6 * 1.0s;
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 4;
};
CamHelperImx296::CamHelperImx296()
: CamHelper(nullptr, frameIntegrationDiff)
{
}
uint32_t CamHelperImx296::gainCode(double gain) const
{
uint32_t code = 20 * std::log10(gain) * 10;
return std::min(code, maxGainCode);
}
double CamHelperImx296::gain(uint32_t gainCode) const
{
return std::pow(10.0, gainCode / 200.0);
}
uint32_t CamHelperImx296::exposureLines(const Duration exposure,
[[maybe_unused]] const Duration lineLength) const
{
return std::max<uint32_t>(minExposureLines, (exposure - 14.26us) / timePerLine);
}
Duration CamHelperImx296::exposure(uint32_t exposureLines,
[[maybe_unused]] const Duration lineLength) const
{
return std::max<uint32_t>(minExposureLines, exposureLines) * timePerLine + 14.26us;
}
void CamHelperImx296::getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay) const
{
exposureDelay = 2;
gainDelay = 2;
vblankDelay = 2;
}
static CamHelper *create()
{
return new CamHelperImx296();
}
static RegisterCamHelper reg("imx296", &create);
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