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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_device.h - Common base for V4L2 video devices and subdevices
*/
#pragma once
#include <map>
#include <memory>
#include <optional>
#include <vector>
#include <linux/videodev2.h>
#include <libcamera/base/log.h>
#include <libcamera/base/signal.h>
#include <libcamera/base/span.h>
#include <libcamera/base/unique_fd.h>
#include <libcamera/color_space.h>
#include <libcamera/controls.h>
#include "libcamera/internal/formats.h"
namespace libcamera {
class EventNotifier;
class V4L2Device : protected Loggable
{
public:
void close();
bool isOpen() const { return fd_.isValid(); }
const ControlInfoMap &controls() const { return controls_; }
ControlList getControls(const std::vector<uint32_t> &ids);
int setControls(ControlList *ctrls);
const struct v4l2_query_ext_ctrl *controlInfo(uint32_t id) const;
const std::string &deviceNode() const { return deviceNode_; }
std::string devicePath() const;
int setFrameStartEnabled(bool enable);
Signal<uint32_t> frameStart;
void updateControlInfo();
protected:
V4L2Device(const std::string &deviceNode);
~V4L2Device();
int open(unsigned int flags);
int setFd(UniqueFD fd);
int ioctl(unsigned long request, void *argp);
int fd() const { return fd_.get(); }
template<typename T>
static std::optional<ColorSpace> toColorSpace(const T &v4l2Format,
PixelFormatInfo::ColourEncoding colourEncoding);
template<typename T>
static int fromColorSpace(const std::optional<ColorSpace> &colorSpace, T &v4l2Format);
private:
static ControlType v4l2CtrlType(uint32_t ctrlType);
static std::unique_ptr<ControlId> v4l2ControlId(const v4l2_query_ext_ctrl &ctrl);
std::optional<ControlInfo> v4l2ControlInfo(const v4l2_query_ext_ctrl &ctrl);
std::optional<ControlInfo> v4l2MenuControlInfo(const v4l2_query_ext_ctrl &ctrl);
void listControls();
void updateControls(ControlList *ctrls,
Span<const v4l2_ext_control> v4l2Ctrls);
void eventAvailable();
std::map<unsigned int, struct v4l2_query_ext_ctrl> controlInfo_;
std::vector<std::unique_ptr<ControlId>> controlIds_;
ControlIdMap controlIdMap_;
ControlInfoMap controls_;
std::string deviceNode_;
UniqueFD fd_;
EventNotifier *fdEventNotifier_;
bool frameStartEnabled_;
};
} /* namespace libcamera */
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