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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* geq.cpp - GEQ (green equalisation) control algorithm
*/
#include <libcamera/base/log.h>
#include "../device_status.h"
#include "../lux_status.h"
#include "../pwl.h"
#include "geq.h"
using namespace RPiController;
using namespace libcamera;
LOG_DEFINE_CATEGORY(RPiGeq)
/*
* We use the lux status so that we can apply stronger settings in darkness (if
* necessary).
*/
#define NAME "rpi.geq"
Geq::Geq(Controller *controller)
: Algorithm(controller)
{
}
char const *Geq::name() const
{
return NAME;
}
void Geq::read(boost::property_tree::ptree const ¶ms)
{
config_.offset = params.get<uint16_t>("offset", 0);
config_.slope = params.get<double>("slope", 0.0);
if (config_.slope < 0.0 || config_.slope >= 1.0)
throw std::runtime_error("Geq: bad slope value");
if (params.get_child_optional("strength"))
config_.strength.read(params.get_child("strength"));
}
void Geq::prepare(Metadata *imageMetadata)
{
LuxStatus luxStatus = {};
luxStatus.lux = 400;
if (imageMetadata->get("lux.status", luxStatus))
LOG(RPiGeq, Warning) << "no lux data found";
DeviceStatus deviceStatus;
deviceStatus.analogueGain = 1.0; /* in case not found */
if (imageMetadata->get("device.status", deviceStatus))
LOG(RPiGeq, Warning)
<< "no device metadata - use analogue gain of 1x";
GeqStatus geqStatus = {};
double strength = config_.strength.empty()
? 1.0
: config_.strength.eval(config_.strength.domain().clip(luxStatus.lux));
strength *= deviceStatus.analogueGain;
double offset = config_.offset * strength;
double slope = config_.slope * strength;
geqStatus.offset = std::min(65535.0, std::max(0.0, offset));
geqStatus.slope = std::min(.99999, std::max(0.0, slope));
LOG(RPiGeq, Debug)
<< "offset " << geqStatus.offset << " slope "
<< geqStatus.slope << " (analogue gain "
<< deviceStatus.analogueGain << " lux "
<< luxStatus.lux << ")";
imageMetadata->set("geq.status", geqStatus);
}
/* Register algorithm with the system. */
static Algorithm *create(Controller *controller)
{
return (Algorithm *)new Geq(controller);
}
static RegisterAlgorithm reg(NAME, &create);
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