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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* cam_helper_ov5647.cpp - camera information for ov5647 sensor
*/
#include <assert.h>
#include "cam_helper.hpp"
#include "md_parser_rpi.hpp"
using namespace RPiController;
class CamHelperOv5647 : public CamHelper
{
public:
CamHelperOv5647();
uint32_t GainCode(double gain) const override;
double Gain(uint32_t gain_code) const override;
void GetDelays(int &exposure_delay, int &gain_delay) const override;
unsigned int HideFramesStartup() const override;
unsigned int HideFramesModeSwitch() const override;
unsigned int MistrustFramesStartup() const override;
unsigned int MistrustFramesModeSwitch() const override;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 4;
/* Largest possible frame length, in units of lines. */
static constexpr int maxFrameLength = 0xffff;
};
/*
* OV5647 doesn't output metadata, so we have to use the "unicam parser" which
* works by counting frames.
*/
CamHelperOv5647::CamHelperOv5647()
: CamHelper(new MdParserRPi(), maxFrameLength, frameIntegrationDiff)
{
}
uint32_t CamHelperOv5647::GainCode(double gain) const
{
return static_cast<uint32_t>(gain * 16.0);
}
double CamHelperOv5647::Gain(uint32_t gain_code) const
{
return static_cast<double>(gain_code) / 16.0;
}
void CamHelperOv5647::GetDelays(int &exposure_delay, int &gain_delay) const
{
/*
* We run this sensor in a mode where the gain delay is bumped up to
* 2. It seems to be the only way to make the delays "predictable".
*/
exposure_delay = 2;
gain_delay = 2;
}
unsigned int CamHelperOv5647::HideFramesStartup() const
{
/*
* On startup, we get a couple of under-exposed frames which
* we don't want shown.
*/
return 2;
}
unsigned int CamHelperOv5647::HideFramesModeSwitch() const
{
/*
* After a mode switch, we get a couple of under-exposed frames which
* we don't want shown.
*/
return 2;
}
unsigned int CamHelperOv5647::MistrustFramesStartup() const
{
/*
* First couple of frames are under-exposed and are no good for control
* algos.
*/
return 2;
}
unsigned int CamHelperOv5647::MistrustFramesModeSwitch() const
{
/*
* First couple of frames are under-exposed even after a simple
* mode switch, and are no good for control algos.
*/
return 2;
}
static CamHelper *Create()
{
return new CamHelperOv5647();
}
static RegisterCamHelper reg("ov5647", &Create);
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