converter_v4l2_m2m.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Laurent Pinchart
 * Copyright 2022 NXP
 *
 * converter_v4l2_m2m.h - V4l2 M2M Format converter interface
 */
 
#pragma once
 
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <tuple>
#include <vector>
 
#include <libcamera/base/log.h>
#include <libcamera/base/signal.h>
 
#include <libcamera/pixel_format.h>
 
#include "libcamera/internal/converter.h"
 
namespace libcamera {
 
class FrameBuffer;
class MediaDevice;
class Size;
class SizeRange;
struct StreamConfiguration;
class V4L2M2MDevice;
 
class V4L2M2MConverter : public Converter
{
public:
    V4L2M2MConverter(MediaDevice *media);
 
    int loadConfiguration([[maybe_unused]] const std::string &filename) { return 0; }
    bool isValid() const { return m2m_ != nullptr; }
 
    std::vector<PixelFormat> formats(PixelFormat input);
    SizeRange sizes(const Size &input);
 
    std::tuple<unsigned int, unsigned int>
    strideAndFrameSize(const PixelFormat &pixelFormat, const Size &size);
 
    int configure(const StreamConfiguration &inputCfg,
              const std::vector<std::reference_wrapper<StreamConfiguration>> &outputCfg);
    int exportBuffers(unsigned int ouput, unsigned int count,
              std::vector<std::unique_ptr<FrameBuffer>> *buffers);
 
    int start();
    void stop();
 
    int queueBuffers(FrameBuffer *input,
             const std::map<unsigned int, FrameBuffer *> &outputs);
 
private:
    class Stream : protected Loggable
    {
    public:
        Stream(V4L2M2MConverter *converter, unsigned int index);
 
        bool isValid() const { return m2m_ != nullptr; }
 
        int configure(const StreamConfiguration &inputCfg,
                  const StreamConfiguration &outputCfg);
        int exportBuffers(unsigned int count,
                  std::vector<std::unique_ptr<FrameBuffer>> *buffers);
 
        int start();
        void stop();
 
        int queueBuffers(FrameBuffer *input, FrameBuffer *output);
 
    protected:
        std::string logPrefix() const override;
 
    private:
        void captureBufferReady(FrameBuffer *buffer);
        void outputBufferReady(FrameBuffer *buffer);
 
        V4L2M2MConverter *converter_;
        unsigned int index_;
        std::unique_ptr<V4L2M2MDevice> m2m_;
 
        unsigned int inputBufferCount_;
        unsigned int outputBufferCount_;
    };
 
    std::unique_ptr<V4L2M2MDevice> m2m_;
 
    std::vector<Stream> streams_;
    std::map<FrameBuffer *, unsigned int> queue_;
};
 
} /* namespace libcamera */