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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2025, Raspberry Pi Ltd
*
* camera helper for imx415 sensor
*/
#include <cmath>
#include "cam_helper.h"
using namespace RPiController;
class CamHelperImx415 : public CamHelper
{
public:
CamHelperImx415();
uint32_t gainCode(double gain) const override;
double gain(uint32_t gainCode) const override;
unsigned int hideFramesStartup() const override;
unsigned int hideFramesModeSwitch() const override;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 8;
};
CamHelperImx415::CamHelperImx415()
: CamHelper({}, frameIntegrationDiff)
{
}
uint32_t CamHelperImx415::gainCode(double gain) const
{
int code = 66.6667 * std::log10(gain);
return std::max(0, std::min(code, 0xf0));
}
double CamHelperImx415::gain(uint32_t gainCode) const
{
return std::pow(10, 0.015 * gainCode);
}
unsigned int CamHelperImx415::hideFramesStartup() const
{
/* On startup, we seem to get 1 bad frame. */
return 1;
}
unsigned int CamHelperImx415::hideFramesModeSwitch() const
{
/* After a mode switch, we seem to get 1 bad frame. */
return 1;
}
static CamHelper *create()
{
return new CamHelperImx415();
}
static RegisterCamHelper reg("imx415", &create);
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