ChunkReader.h

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#ifndef OPENSHOT_CHUNK_READER_H
#define OPENSHOT_CHUNK_READER_H
 
#include <string>
#include <memory>
 
#include "ReaderBase.h"
#include "Json.h"
 
namespace openshot
{
    class CacheBase;
    class Frame;
    struct ChunkLocation
    {
        int64_t number; 
        int64_t frame; 
    };
 
    enum ChunkVersion
    {
        THUMBNAIL,  
        PREVIEW,    
        FINAL       
    };
 
    class ChunkReader : public ReaderBase
    {
    private:
        std::string path;
        bool is_open;
        int64_t chunk_size;
        openshot::ReaderBase *local_reader;
        ChunkLocation previous_location;
        ChunkVersion version;
        std::shared_ptr<openshot::Frame> last_frame;
 
        bool does_folder_exist(std::string path);
 
        ChunkLocation find_chunk_frame(int64_t requested_frame);
 
        std::string get_chunk_path(int64_t chunk_number, std::string folder, std::string extension);
 
        void load_json();
 
    public:
 
        ChunkReader(std::string path, ChunkVersion chunk_version);
 
        void Close() override;
 
        int64_t GetChunkSize() { return chunk_size; };
 
        void SetChunkSize(int64_t new_size) { chunk_size = new_size; };
 
        openshot::CacheBase* GetCache() override { return nullptr; };
 
        std::shared_ptr<openshot::Frame> GetFrame(int64_t requested_frame) override;
 
        bool IsOpen() override { return is_open; };
 
        std::string Name() override { return "ChunkReader"; };
 
        // Get and Set JSON methods
        std::string Json() const override; 
        void SetJson(const std::string value) override; 
        Json::Value JsonValue() const override; 
        void SetJsonValue(const Json::Value root) override; 
 
        void Open() override;
    };
 
}
 
#endif