summaryrefslogtreecommitdiff
path: root/src/v4l2/v4l2_camera_file.cpp
blob: a07679b587cef2923e8958bdd34a7cb073c1ea81 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Google Inc.
 *
 * v4l2_camera_file.h - V4L2 compatibility camera file information
 */

#include "v4l2_camera_file.h"

#include <linux/videodev2.h>

#include "v4l2_camera_proxy.h"

using namespace libcamera;

V4L2CameraFile::V4L2CameraFile(int efd, bool nonBlocking, V4L2CameraProxy *proxy)
	: proxy_(proxy), nonBlocking_(nonBlocking), efd_(efd),
	  priority_(V4L2_PRIORITY_DEFAULT)
{
	proxy_->open(this);
}

V4L2CameraFile::~V4L2CameraFile()
{
	proxy_->close(this);
}
pan class="hl ppc">#include <math.h> #include "libcamera/internal/log.h" #include "../device_status.h" #include "../noise_status.h" #include "noise.hpp" using namespace RPiController; using namespace libcamera; LOG_DEFINE_CATEGORY(RPiNoise) #define NAME "rpi.noise" Noise::Noise(Controller *controller) : Algorithm(controller), mode_factor_(1.0) { } char const *Noise::Name() const { return NAME; } void Noise::SwitchMode(CameraMode const &camera_mode, [[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?) mode_factor_ = std::max(1.0, camera_mode.noise_factor); } void Noise::Read(boost::property_tree::ptree const &params) { reference_constant_ = params.get<double>("reference_constant"); reference_slope_ = params.get<double>("reference_slope"); } void Noise::Prepare(Metadata *image_metadata) { struct DeviceStatus device_status; device_status.analogue_gain = 1.0; // keep compiler calm if (image_metadata->Get("device.status", device_status) == 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(device_status.analogue_gain) / mode_factor_; struct NoiseStatus status; status.noise_constant = reference_constant_ * factor; status.noise_slope = reference_slope_ * factor; image_metadata->Set("noise.status", status); LOG(RPiNoise, Debug) << "constant " << status.noise_constant << " slope " << status.noise_slope; } 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);