Laurent Pinchart
de012767e7
The standard way in C++17 to specify that a function or function argument may be unused it to specify the [[maybe_unused]] attribute. Replace manual void casts to silence compiler warnings. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2019, Raspberry Pi (Trading) Limited
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*
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* noise.cpp - Noise control algorithm
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*/
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#include <math.h>
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#include "../device_status.h"
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#include "../logging.hpp"
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#include "../noise_status.h"
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#include "noise.hpp"
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using namespace RPi;
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#define NAME "rpi.noise"
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Noise::Noise(Controller *controller)
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: Algorithm(controller), mode_factor_(1.0)
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{
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}
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char const *Noise::Name() const
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{
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return NAME;
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}
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void Noise::SwitchMode(CameraMode const &camera_mode,
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[[maybe_unused]] Metadata *metadata)
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{
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// For example, we would expect a 2x2 binned mode to have a "noise
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// factor" of sqrt(2x2) = 2. (can't be less than one, right?)
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mode_factor_ = std::max(1.0, camera_mode.noise_factor);
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}
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void Noise::Read(boost::property_tree::ptree const ¶ms)
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{
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RPI_LOG(Name());
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reference_constant_ = params.get<double>("reference_constant");
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reference_slope_ = params.get<double>("reference_slope");
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}
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void Noise::Prepare(Metadata *image_metadata)
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{
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struct DeviceStatus device_status;
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device_status.analogue_gain = 1.0; // keep compiler calm
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if (image_metadata->Get("device.status", device_status) == 0) {
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// There is a slight question as to exactly how the noise
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// profile, specifically the constant part of it, scales. For
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// now we assume it all scales the same, and we'll revisit this
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// if it proves substantially wrong. NOTE: we may also want to
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// make some adjustments based on the camera mode (such as
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// binning), if we knew how to discover it...
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double factor = sqrt(device_status.analogue_gain) / mode_factor_;
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struct NoiseStatus status;
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status.noise_constant = reference_constant_ * factor;
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status.noise_slope = reference_slope_ * factor;
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image_metadata->Set("noise.status", status);
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RPI_LOG(Name() << ": constant " << status.noise_constant
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<< " slope " << status.noise_slope);
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} else
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RPI_WARN(Name() << " no metadata");
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}
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// Register algorithm with the system.
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static Algorithm *Create(Controller *controller)
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{
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return new Noise(controller);
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}
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static RegisterAlgorithm reg(NAME, &Create);
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