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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019, Raspberry Pi Ltd
 *
 * noise.cpp - Noise control algorithm
 */

#include <math.h>

#include <libcamera/base/log.h>

#include "../device_status.h"
#include "../noise_status.h"

#include "noise.h"

using namespace RPiController;
using namespace libcamera;

LOG_DEFINE_CATEGORY(RPiNoise)

#define NAME "rpi.noise"

Noise::Noise(Controller *controller)
	: Algorithm(controller), modeFactor_(1.0)
{
}

char const *Noise::name() const
{
	return NAME;
}

void Noise::switchMode(CameraMode const &cameraMode,
		       [[maybe_unused]] Metadata *metadata)
{
	/*
	 * For example, we would expect a 2x2 binned mode to have a "noise
	 * factor" of sqrt(2x2) = 2. (can't be less than one, right?)
	 */
	modeFactor_ = std::max(1.0, cameraMode.noiseFactor);
}

int Noise::read(const libcamera::YamlObject &params)
{
	auto value = params["reference_constant"].get<double>();
	if (!value)
		return -EINVAL;
	referenceConstant_ = *value;

	value = params["reference_slope"].get<double>();
	if (!value)
		return -EINVAL;
	referenceSlope_ = *value;