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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2021, Raspberry Pi (Trading) Limited
*
* cam_helper_ov9281.cpp - camera information for ov9281 sensor
*/
#include <assert.h>
#include "cam_helper.hpp"
using namespace RPiController;
class CamHelperOv9281 : public CamHelper
{
public:
CamHelperOv9281();
uint32_t GainCode(double gain) const override;
double Gain(uint32_t gain_code) const override;
void GetDelays(int &exposure_delay, int &gain_delay,
int &vblank_delay) const override;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 4;
};
/*
* OV9281 doesn't output metadata, so we have to use the "unicam parser" which
* works by counting frames.
*/
CamHelperOv9281::CamHelperOv9281()
: CamHelper({}, frameIntegrationDiff)
{
}
uint32_t CamHelperOv9281::GainCode(double gain) const
{
return static_cast<uint32_t>(gain * 16.0);
}
double CamHelperOv9281::Gain(uint32_t gain_code) const
{
return static_cast<double>(gain_code) / 16.0;
}
void CamHelperOv9281::GetDelays(int &exposure_delay, int &gain_delay,
int &vblank_delay) const
{
/* The driver appears to behave as follows: */
exposure_delay = 2;
gain_delay = 2;
vblank_delay = 2;
}
static CamHelper *Create()
{
return new CamHelperOv9281();
}
static RegisterCamHelper reg("ov9281", &Create);
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