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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.h"
using namespace RPiController;
class CamHelperOv5647 : public CamHelper
{
public:
CamHelperOv5647();
uint32_t gainCode(double gain) const override;
double gain(uint32_t gainCode) const override;
void getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay) 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;
};
/*
* OV5647 doesn't output metadata, so we have to use the "unicam parser" which
* works by counting frames.
*/
CamHelperOv5647::CamHelperOv5647()
: CamHelper({}, frameIntegrationDiff)
{
}
uint32_t CamHelperOv5647::gainCode(double gain) const
{
return static_cast<uint32_t>(gain * 16.0);
}
double CamHelperOv5647::gain(uint32_t gainCode) const
{
return static_cast<double>(gainCode) / 16.0;
}
void CamHelperOv5647::getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay) 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".
*/
exposureDelay = 2;
gainDelay = 2;
vblankDelay = 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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