camera_sensor.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * A camera sensor
 */

#pragma once

#include <memory>
#include <string>
#include <variant>
#include <vector>

#include <libcamera/base/class.h>

#include <libcamera/control_ids.h>
#include <libcamera/controls.h>
#include <libcamera/geometry.h>
#include <libcamera/orientation.h>
#include <libcamera/transform.h>

#include "libcamera/internal/bayer_format.h"
#include "libcamera/internal/v4l2_subdevice.h"

namespace libcamera {

class CameraLens;
class MediaEntity;
class SensorConfiguration;

enum class Orientation;

struct IPACameraSensorInfo;

class CameraSensor
{
public:
    virtual ~CameraSensor();

    virtual const std::string &model() const = 0;
    virtual const std::string &id() const = 0;

    virtual const MediaEntity *entity() const = 0;
    virtual V4L2Subdevice *device() = 0;

    virtual CameraLens *focusLens() = 0;

    virtual const std::vector<unsigned int> &mbusCodes() const = 0;
    virtual std::vector<Size> sizes(unsigned int mbusCode) const = 0;
    virtual Size resolution() const = 0;

    virtual V4L2SubdeviceFormat
    getFormat(const std::vector<unsigned int> &mbusCodes,
          const Size &size) const = 0;
    virtual int setFormat(V4L2SubdeviceFormat *format,
                  Transform transform = Transform::Identity) = 0;
    virtual int tryFormat(V4L2SubdeviceFormat *format) const = 0;

    virtual int applyConfiguration(const SensorConfiguration &config,
                       Transform transform = Transform::Identity,
                       V4L2SubdeviceFormat *sensorFormat = nullptr) = 0;

    virtual const ControlList &properties() const = 0;
    virtual int sensorInfo(IPACameraSensorInfo *info) const = 0;
    virtual Transform computeTransform(Orientation *orientation) const = 0;
    virtual BayerFormat::Order bayerOrder(Transform t) const = 0;

    virtual const ControlInfoMap &controls() const = 0;
    virtual ControlList getControls(const std::vector<uint32_t> &ids) = 0;
    virtual int setControls(ControlList *ctrls) = 0;

    virtual const std::vector<controls::draft::TestPatternModeEnum> &
    testPatternModes() const = 0;
    virtual int setTestPatternMode(controls::draft::TestPatternModeEnum mode) = 0;
};

class CameraSensorFactoryBase
{
public:
    CameraSensorFactoryBase(const char *name, int priority);
    virtual ~CameraSensorFactoryBase() = default;

    static std::unique_ptr<CameraSensor> create(MediaEntity *entity);

    const std::string &name() const { return name_; }
    int priority() const { return priority_; }

private:
    LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorFactoryBase)

    static std::vector<CameraSensorFactoryBase *> &factories();

    static void registerFactory(CameraSensorFactoryBase *factory);

    virtual std::variant<std::unique_ptr<CameraSensor>, int>
    match(MediaEntity *entity) const = 0;

    std::string name_;
    int priority_;
};

template<typename _CameraSensor>
class CameraSensorFactory final : public CameraSensorFactoryBase
{
public:
    CameraSensorFactory(const char *name, int priority)
        : CameraSensorFactoryBase(name, priority)
    {
    }

private:
    std::variant<std::unique_ptr<CameraSensor>, int>
    match(MediaEntity *entity) const override
    {
        return _CameraSensor::match(entity);
    }
};

#define REGISTER_CAMERA_SENSOR(sensor, priority) \
static CameraSensorFactory<sensor> global_##sensor##Factory{ #sensor, priority };

} /* namespace libcamera */