converter.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Laurent Pinchart
 * Copyright 2022 NXP
 *
 * Generic format converter interface
 */
 
#pragma once
 
#include <functional>
#include <initializer_list>
#include <map>
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
 
#include <libcamera/base/class.h>
#include <libcamera/base/flags.h>
#include <libcamera/base/signal.h>
 
#include <libcamera/geometry.h>
#include "libcamera/internal/v4l2_request.h"
 
namespace libcamera {
 
class FrameBuffer;
class MediaDevice;
class PixelFormat;
class Stream;
struct StreamConfiguration;
 
class Converter
{
public:
    enum class Feature {
        None = 0,
        InputCrop = (1 << 0),
    };
 
    using Features = Flags<Feature>;
 
    enum class Alignment {
        Down = 0,
        Up,
    };
 
    Converter(std::shared_ptr<MediaDevice> media, Features features = Feature::None);
    virtual ~Converter();
 
    virtual int loadConfiguration(const std::string &filename) = 0;
 
    virtual bool isValid() const = 0;
 
    virtual std::vector<PixelFormat> formats(PixelFormat input) = 0;
    virtual SizeRange sizes(const Size &input) = 0;
 
    virtual Size adjustInputSize(const PixelFormat &pixFmt,
                     const Size &size,
                     Alignment align = Alignment::Down) = 0;
    virtual Size adjustOutputSize(const PixelFormat &pixFmt,
                      const Size &size,
                      Alignment align = Alignment::Down) = 0;
 
    virtual std::tuple<unsigned int, unsigned int>
    strideAndFrameSize(const PixelFormat &pixelFormat, const Size &size) = 0;
 
    virtual int validateOutput(StreamConfiguration *cfg, bool *adjusted,
                   Alignment align = Alignment::Down) = 0;
 
    virtual int configure(const StreamConfiguration &inputCfg,
                  const std::vector<std::reference_wrapper<StreamConfiguration>> &outputCfgs) = 0;
    virtual bool isConfigured(const Stream *stream) const = 0;
    virtual int exportBuffers(const Stream *stream, unsigned int count,
                  std::vector<std::unique_ptr<FrameBuffer>> *buffers) = 0;
 
    virtual int start() = 0;
    virtual void stop() = 0;
 
    virtual int queueBuffers(FrameBuffer *input,
                 const std::map<const Stream *, FrameBuffer *> &outputs,
                 const V4L2Request *request = nullptr) = 0;
 
    virtual int setInputCrop(const Stream *stream, Rectangle *rect) = 0;
    virtual std::pair<Rectangle, Rectangle> inputCropBounds() = 0;
    virtual std::pair<Rectangle, Rectangle> inputCropBounds(const Stream *stream) = 0;
 
    Signal<FrameBuffer *> inputBufferReady;
    Signal<FrameBuffer *> outputBufferReady;
 
    const std::string &deviceNode() const { return deviceNode_; }
 
    Features features() const { return features_; }
 
protected:
    Features features_;
 
private:
    std::string deviceNode_;
};
 
class ConverterFactoryBase
{
public:
    ConverterFactoryBase(const std::string name, std::initializer_list<std::string> compatibles);
    virtual ~ConverterFactoryBase() = default;
 
    const std::vector<std::string> &compatibles() const { return compatibles_; }
 
    static std::unique_ptr<Converter> create(std::shared_ptr<MediaDevice> media);
    static std::vector<ConverterFactoryBase *> &factories();
    static std::vector<std::string> names();
 
private:
    LIBCAMERA_DISABLE_COPY_AND_MOVE(ConverterFactoryBase)
 
    static void registerType(ConverterFactoryBase *factory);
 
    virtual std::unique_ptr<Converter>
    createInstance(std::shared_ptr<MediaDevice> media) const = 0;
 
    std::string name_;
    std::vector<std::string> compatibles_;
};
 
template<typename _Converter>
class ConverterFactory : public ConverterFactoryBase
{
public:
    ConverterFactory(const char *name, std::initializer_list<std::string> compatibles)
        : ConverterFactoryBase(name, compatibles)
    {
    }
 
    std::unique_ptr<Converter> createInstance(std::shared_ptr<MediaDevice> media) const override
    {
        return std::make_unique<_Converter>(media);
    }
};
 
#define REGISTER_CONVERTER(name, converter, compatibles) \
    static ConverterFactory<converter> global_##converter##Factory(name, compatibles);
 
} /* namespace libcamera */