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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 ¶ms)
{
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;
return 0;
}
void Noise::prepare(Metadata *imageMetadata)
{
struct DeviceStatus deviceStatus;
deviceStatus.analogueGain = 1.0; /* keep compiler calm */
if (imageMetadata->get("device.status", deviceStatus) == 0) {
/*
* There is a slight question as to exactly how the noise
* profile, specifically the constant part of it, scales. For
* now we assume it all scales the same, and we'll revisit this
* if it proves substantially wrong. NOTE: we may also want to
* make some adjustments based on the camera mode (such as
* binning), if we knew how to discover it...
*/
double factor = sqrt(deviceStatus.analogueGain) / modeFactor_;
struct NoiseStatus status;
status.noiseConstant = referenceConstant_ * factor;
status.noiseSlope = referenceSlope_ * factor;
imageMetadata->set("noise.status", status);
LOG(RPiNoise, Debug)
<< "constant " << status.noiseConstant
<< " slope " << status.noiseSlope;
} else
LOG(RPiNoise, Warning) << " no metadata";
}
/* Register algorithm with the system. */
static Algorithm *create(Controller *controller)
{
return new Noise(controller);
}
static RegisterAlgorithm reg(NAME, &create);
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