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);
 
    void populateControlValueEntry(struct ipa_control_value_entry &entry,
                       const ControlValue &value,
                       uint32_t offset);
 
    ControlValue loadControlValue(ByteStreamBuffer &buffer,
                      ControlType type,
                      bool isArray, unsigned int count);
 
    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 */