control_serializer.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * Control (de)serializer
 */

#pragma once

#include <map>
#include <memory>
#include <vector>

#include <libcamera/controls.h>

namespace libcamera {

class ByteStreamBuffer;

class ControlSerializer
{
public:
    enum class Role {
        Proxy,
        Worker
    };

    ControlSerializer(Role role);

    void reset();

    static size_t binarySize(const ControlInfoMap &infoMap);
    static size_t binarySize(const ControlList &list);

    int serialize(const ControlInfoMap &infoMap, ByteStreamBuffer &buffer);
    int serialize(const ControlList &list, ByteStreamBuffer &buffer);

    template<typename T>
    T deserialize(ByteStreamBuffer &buffer);

    bool isCached(const ControlInfoMap &infoMap);

private:
    static size_t binarySize(const ControlValue &value);
    static size_t binarySize(const ControlInfo &info);

    static void store(const ControlValue &value, ByteStreamBuffer &buffer);
    static void store(const ControlInfo &info, ByteStreamBuffer &buffer);

    ControlValue loadControlValue(ByteStreamBuffer &buffer,
                      bool isArray = false, unsigned int count = 1);
    ControlInfo loadControlInfo(ByteStreamBuffer &buffer);

    unsigned int serial_;
    unsigned int serialSeed_;
    std::vector<std::unique_ptr<ControlId>> controlIds_;
    std::vector<std::unique_ptr<ControlIdMap>> controlIdMaps_;
    std::map<unsigned int, ControlInfoMap> infoMaps_;
    std::map<const ControlInfoMap *, unsigned int> infoMapHandles_;
};

} /* namespace libcamera */