src/v4l2/libcamerify.in


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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-or-later

help() {
	echo "$0: Load an application with libcamera V4L2 compatibility layer preload"
	echo " $0 [OPTIONS...] executable [args]"
	echo " -d, --debug	Increase log level"
}

debug=0
while [ $# -gt 0 ]; do
	case $1 in
		-d|--debug)
			debug=$((debug+1))
			;;
		-h)
			help;
			exit 0
			;;
		--)
			shift;
			break;;
		-*)
			echo "Unrecognised option: $1";
			help;
			exit 1
			;;
		*)
			break
			;;
	esac
	shift
done

[ $debug -gt 0 ] && loglevel=V4L2Compat:0
[ $debug -gt 1 ] && loglevel=0
[ "$loglevel" != "" ] && export LIBCAMERA_LOG_LEVELS=$loglevel

if [ "$LD_PRELOAD" = "" ] ; then
   LD_PRELOAD='@LIBCAMERA_V4L2_SO@'
else
   LD_PRELOAD="$LD_PRELOAD "'@LIBCAMERA_V4L2_SO@'
fi

export LD_PRELOAD

exec "$@"
/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2021, Raspberry Pi Ltd
 *
 * cam_helper_imx290.cpp - camera helper for imx290 sensor
 */

#include <math.h>

#include "cam_helper.h"

using namespace RPiController;

class CamHelperImx290 : public CamHelper
{
public:
	CamHelperImx290();
	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 hideFramesModeSwitch() const override;

private:
	/*
	 * Smallest difference between the frame length and integration time,
	 * in units of lines.
	 */
	static constexpr int frameIntegrationDiff = 2;
};

CamHelperImx290::CamHelperImx290()
	: CamHelper({}, frameIntegrationDiff)
{
}

uint32_t CamHelperImx290::gainCode(double gain) const
{
	int code = 66.6667 * log10(gain);
	return std::max(0, std::min(code, 0xf0));
}

double CamHelperImx290::gain(uint32_t gainCode) const
{
	return pow(10, 0.015 * gainCode);
}

void CamHelperImx290::getDelays(int &exposureDelay, int &gainDelay,
				int &vblankDelay) const
{
	exposureDelay = 2;
	gainDelay = 2;
	vblankDelay = 2;
}

unsigned int CamHelperImx290::hideFramesModeSwitch() const
{
	/* After a mode switch, we seem to get 1 bad frame. */
	return 1;
}

static CamHelper *create()
{
	return new CamHelperImx290();
}

static RegisterCamHelper reg("imx290", &create);