rs_processing.hpp

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// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2017 RealSense, Inc. All Rights Reserved.
 
#ifndef LIBREALSENSE_RS2_PROCESSING_HPP
#define LIBREALSENSE_RS2_PROCESSING_HPP
 
#include "rs_frame.hpp"
#include "rs_options.hpp"
 
namespace rs2
{
    class frame_source
    {
    public:
        frame allocate_video_frame(const stream_profile& profile,
            const frame& original,
            int new_bpp = 0,
            int new_width = 0,
            int new_height = 0,
            int new_stride = 0,
            rs2_extension frame_type = RS2_EXTENSION_VIDEO_FRAME) const
        {
            rs2_error* e = nullptr;
            auto result = rs2_allocate_synthetic_video_frame(_source, profile.get(),
                original.get(), new_bpp, new_width, new_height, new_stride, frame_type, &e);
            error::handle(e);
            return result;
        }

        frame allocate_motion_frame(const stream_profile& profile,
            const frame& original,
            rs2_extension frame_type = RS2_EXTENSION_MOTION_FRAME) const
        {
            rs2_error* e = nullptr;
            auto result = rs2_allocate_synthetic_motion_frame(_source, profile.get(),
                original.get(), frame_type, &e);
            error::handle(e);
            return result;
        }
 
        frame allocate_points(const stream_profile& profile,
            const frame& original) const
        {
            rs2_error* e = nullptr;
            auto result = rs2_allocate_points(_source, profile.get(), original.get(), &e);
            error::handle(e);
            return result;
        }

        frame allocate_composite_frame(std::vector<frame> frames) const
        {
            rs2_error* e = nullptr;
 
            std::vector<rs2_frame*> refs(frames.size(), (rs2_frame*)nullptr);
            for (size_t i = 0; i < frames.size(); i++)
                std::swap(refs[i], frames[i].frame_ref);
 
            auto result = rs2_allocate_composite_frame(_source, refs.data(), (int)refs.size(), &e);
            error::handle(e);
            return result;
        }

        void frame_ready(frame result) const
        {
            rs2_error* e = nullptr;
            rs2_synthetic_frame_ready(_source, result.get(), &e);
            error::handle(e);
            result.frame_ref = nullptr;
        }
 
        rs2_source* _source;
    private:
        template<class T>
        friend class frame_processor_callback;
 
        frame_source(rs2_source* source) : _source(source) {}
        frame_source(const frame_source&) = delete;
 
    };
 
    template<class T>
    class frame_processor_callback : public rs2_frame_processor_callback
    {
        T on_frame_function;
    public:
        explicit frame_processor_callback(T on_frame) : on_frame_function(on_frame) {}
 
        void on_frame(rs2_frame* f, rs2_source * source) override
        {
            frame_source src(source);
            frame frm(f);
            on_frame_function(std::move(frm), src);
        }
 
        void release() override { delete this; }
    };
 
    class frame_queue
    {
    public:
        explicit frame_queue(unsigned int capacity, bool keep_frames = false) : _capacity(capacity), _keep(keep_frames)
        {
            rs2_error* e = nullptr;
            _queue = std::shared_ptr<rs2_frame_queue>(
                rs2_create_frame_queue(capacity, &e),
                rs2_delete_frame_queue);
            error::handle(e);
        }
 
        frame_queue() : frame_queue(1) {}

        void enqueue(frame f) const
        {
            if (_keep) f.keep();
            rs2_enqueue_frame(f.frame_ref, _queue.get()); // noexcept
            f.frame_ref = nullptr; // frame has been essentially moved from
        }

        frame wait_for_frame(unsigned int timeout_ms = 5000) const
        {
            rs2_error* e = nullptr;
            auto frame_ref = rs2_wait_for_frame(_queue.get(), timeout_ms, &e);
            error::handle(e);
            return{ frame_ref };
        }

        template<typename T>
        typename std::enable_if<std::is_base_of<rs2::frame, T>::value, bool>::type poll_for_frame(T* output) const
        {
            rs2_error* e = nullptr;
            rs2_frame* frame_ref = nullptr;
            auto res = rs2_poll_for_frame(_queue.get(), &frame_ref, &e);
            error::handle(e);
            frame f{ frame_ref };
            if (res) *output = f;
            return res > 0;
        }
 
        template<typename T>
        typename std::enable_if<std::is_base_of<rs2::frame, T>::value, bool>::type try_wait_for_frame(T* output, unsigned int timeout_ms = 5000) const
        {
            rs2_error* e = nullptr;
            rs2_frame* frame_ref = nullptr;
            auto res = rs2_try_wait_for_frame(_queue.get(), timeout_ms, &frame_ref, &e);
            error::handle(e);
            frame f{ frame_ref };
            if (res) *output = f;
            return res > 0;
        }

        void operator()(frame f) const
        {
            enqueue(std::move(f));
        }

        size_t size() const
        {
            rs2_error* e = nullptr;
            auto res = rs2_frame_queue_size(_queue.get(), &e);
            error::handle(e);
            return static_cast<size_t>(res);
        }

        size_t capacity() const { return _capacity; }
        bool keep_frames() const { return _keep; }

        std::shared_ptr<rs2_frame_queue> get() { return _queue; }
 
    private:
        std::shared_ptr<rs2_frame_queue> _queue;
        size_t _capacity;
        bool _keep;
    };

    class processing_block : public options
    {
    public:
        using options::supports;

        template<class S>
        void start(S on_frame)
        {
            rs2_error* e = nullptr;
            rs2_start_processing(get(), new frame_callback<S>(on_frame), &e);
            error::handle(e);
        }

        template<class S>
        S& operator>>(S& on_frame)
        {
            start(on_frame);
            return on_frame;
        }

        void invoke(frame f) const
        {
            rs2_frame* ptr = nullptr;
            std::swap(f.frame_ref, ptr);
 
            rs2_error* e = nullptr;
            rs2_process_frame(get(), ptr, &e);
            error::handle(e);
        }

        processing_block(std::shared_ptr<rs2_processing_block> block)
            : options((rs2_options*)block.get()), _block(block)
        {
        }

        template<class S>
        processing_block(S processing_function)
        {
            rs2_error* e = nullptr;
            _block = std::shared_ptr<rs2_processing_block>(
                rs2_create_processing_block(new frame_processor_callback<S>(processing_function), &e),
                rs2_delete_processing_block);
            options::operator=(_block);
            error::handle(e);
        }
 
        operator rs2_options*() const { return (rs2_options*)get(); }
        rs2_processing_block* get() const { return _block.get(); }

        bool supports(rs2_camera_info info) const
        {
            rs2_error* e = nullptr;
            auto is_supported = rs2_supports_processing_block_info(_block.get(), info, &e);
            error::handle(e);
            return is_supported > 0;
        }

        const char* get_info(rs2_camera_info info) const
        {
            rs2_error* e = nullptr;
            auto result = rs2_get_processing_block_info(_block.get(), info, &e);
            error::handle(e);
            return result;
        }
    protected:
        void register_simple_option(rs2_option option_id, option_range range) {
            rs2_error * e = nullptr;
            rs2_processing_block_register_simple_option(_block.get(), option_id,
                    range.min, range.max, range.step, range.def, &e);
            error::handle(e);
        }
        std::shared_ptr<rs2_processing_block> _block;
    };

    class filter : public processing_block, public filter_interface
    {
    public:
        rs2::frame process(rs2::frame frame) const override
        {
            invoke(frame);
            rs2::frame f;
            if (!_queue.poll_for_frame(&f))
                throw std::runtime_error("Error occured during execution of the processing block! See the log for more info");
            return f;
        }

        filter(std::shared_ptr<rs2_processing_block> block, int queue_size = 1)
            : processing_block(block),
            _queue(queue_size)
        {
            start(_queue);
        }

        template<class S>
        filter(S processing_function, int queue_size = 1) :
            processing_block(processing_function),
            _queue(queue_size)
        {
            start(_queue);
        }
 
 
        frame_queue get_queue() { return _queue; }
        rs2_processing_block* get() const { return _block.get(); }
 
        template<class T>
        bool is() const
        {
            T extension(*this);
            return extension;
        }
 
        template<class T>
        T as() const
        {
            T extension(*this);
            return extension;
        }
 
        operator bool() const { return _block.get() != nullptr; }
    protected:
        frame_queue _queue;
    };

    class pointcloud : public filter
    {
    public:
        pointcloud() : filter(init(), 1) {}
 
        pointcloud(rs2_stream stream, int index = 0) : filter(init(), 1)
        {
            set_option(RS2_OPTION_STREAM_FILTER, float(stream));
            set_option(RS2_OPTION_STREAM_INDEX_FILTER, float(index));
        }

        points calculate(frame depth) const
        {
            auto res = process(depth);
            if (res.as<points>())
                return res;
 
            if (auto set = res.as <frameset>())
            {
                for (auto f : set)
                {
                    if(f.as<points>())
                        return f;
                }
            }
            throw std::runtime_error("Error occured during execution of the processing block! See the log for more info");
        }

        void map_to(frame mapped)
        {
            set_option(RS2_OPTION_STREAM_FILTER, float(mapped.get_profile().stream_type()));
            set_option(RS2_OPTION_STREAM_FORMAT_FILTER, float(mapped.get_profile().format()));
            set_option(RS2_OPTION_STREAM_INDEX_FILTER, float(mapped.get_profile().stream_index()));
            process(mapped);
        }
 
    protected:
        pointcloud(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
 
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_pointcloud(&e),
                rs2_delete_processing_block);
 
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(pb);
            return block;
        }
    };
 
    class yuy_decoder : public filter
    {
    public:
        yuy_decoder() : filter(init(), 1) { }
 
    protected:
        yuy_decoder(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_yuy_decoder(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class m420_decoder : public filter
    {
    public:
        m420_decoder() : filter(init(), 1) { }
 
    protected:
        m420_decoder(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_m420_decoder(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class y411_decoder : public filter
    {
    public:
        y411_decoder() : filter(init()) { }
 
    protected:
        y411_decoder(std::shared_ptr<rs2_processing_block> block) : filter(block) {}
 
    private:
        static std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_y411_decoder(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
  class threshold_filter : public filter
    {
    public:
        threshold_filter(float min_dist = 0.15f, float max_dist = 4.f)
            : filter(init(), 1)
        {
            set_option(RS2_OPTION_MIN_DISTANCE, min_dist);
            set_option(RS2_OPTION_MAX_DISTANCE, max_dist);
        }
 
        threshold_filter(filter f) : filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_THRESHOLD_FILTER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
 
    protected:
        threshold_filter(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_threshold(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class units_transform : public filter
    {
    public:
        units_transform() : filter(init(), 1) {}
 
    protected:
        units_transform(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_units_transform(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class asynchronous_syncer : public processing_block
    {
    public:
        asynchronous_syncer() : processing_block(init()) {}
 
    private:
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_sync_processing_block(&e),
                rs2_delete_processing_block);
 
            error::handle(e);
            return block;
        }
    };
 
    class syncer
    {
    public:
        syncer(int queue_size = 1)
            :_results(queue_size)
        {
            _sync.start(_results);
        }

        frameset wait_for_frames(unsigned int timeout_ms = 5000) const
        {
            return frameset(_results.wait_for_frame(timeout_ms));
        }

        bool poll_for_frames(frameset* fs) const
        {
            frame result;
            if (_results.poll_for_frame(&result))
            {
                *fs = frameset(result);
                return true;
            }
            return false;
        }

        bool try_wait_for_frames(frameset* fs, unsigned int timeout_ms = 5000) const
        {
            frame result;
            if (_results.try_wait_for_frame(&result, timeout_ms))
            {
                *fs = frameset(result);
                return true;
            }
            return false;
        }
 
        void operator()(frame f) const
        {
            _sync.invoke(std::move(f));
        }
    private:
        asynchronous_syncer _sync;
        frame_queue _results;
    };

    class align : public filter
    {
    public:
        align(rs2_stream align_to) : filter(init(align_to), 1) {}
 
        using filter::process;

        frameset process(frameset frames)
        {
            return filter::process(frames);
        }
 
    protected:
        align(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        friend class context;
        std::shared_ptr<rs2_processing_block> init(rs2_stream align_to)
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_align(align_to, &e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class colorizer : public filter
    {
    public:
        colorizer() : filter(init(), 1) { }
        colorizer(float color_scheme) : filter(init(), 1)
        {
            set_option(RS2_OPTION_COLOR_SCHEME, float(color_scheme));
        }

        video_frame colorize(frame depth) const
        {
            return process(depth);
        }
 
    protected:
        colorizer(std::shared_ptr<rs2_processing_block> block) : filter(block, 1) {}
 
    private:
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_colorizer(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(pb);
 
            return block;
        }
    };
 
    class decimation_filter : public filter
    {
    public:
        decimation_filter() : filter(init(), 1) {}
        decimation_filter(float magnitude) : filter(init(), 1)
        {
            set_option(RS2_OPTION_FILTER_MAGNITUDE, magnitude);
        }
 
        decimation_filter(filter f) : filter(f)
        {
             rs2_error* e = nullptr;
             if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_DECIMATION_FILTER, &e) && !e)
             {
                 _block.reset();
             }
             error::handle(e);
        }
 
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_decimation_filter_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(this);
 
            return block;
        }
    };
 
    class rotation_filter : public filter
    {
    public:
        rotation_filter()
            : filter( init( std::vector< rs2_stream >{ RS2_STREAM_DEPTH } ), 1 )
        {
        }
 
        rotation_filter( std::vector< rs2_stream > streams_to_rotate )
            : filter( init( streams_to_rotate ), 1 )
        {
        }
 
        rotation_filter( std::vector< rs2_stream > streams_to_rotate, float value )
            : filter( init( streams_to_rotate ), 1 )
        {
            set_option( RS2_OPTION_ROTATION, value );
        }
 
        rotation_filter( filter f )
            : filter( f )
        {
            rs2_error * e = nullptr;
            if( ! rs2_is_processing_block_extendable_to( f.get(), RS2_EXTENSION_ROTATION_FILTER, &e ) && ! e )
            {
                _block.reset();
            }
            error::handle( e );
        }
 
    private:
        friend class context;
 
        std::shared_ptr< rs2_processing_block > init( std::vector< rs2_stream > streams_to_rotate )
        {
            rs2_error * e = nullptr;
 
            rs2_streams_list streams_list;
            streams_list.list = std::move( streams_to_rotate ); 
 
            auto block = std::shared_ptr< rs2_processing_block >( rs2_create_rotation_filter_block( streams_list, &e ),
                                                                  rs2_delete_processing_block );
            error::handle( e );
            return block;
        }
    };
 
    class temporal_filter : public filter
    {
    public:
        temporal_filter() : filter(init(), 1) {}
        temporal_filter(float smooth_alpha, float smooth_delta, int persistence_control) : filter(init(), 1)
        {
            set_option(RS2_OPTION_HOLES_FILL, float(persistence_control));
            set_option(RS2_OPTION_FILTER_SMOOTH_ALPHA, float(smooth_alpha));
            set_option(RS2_OPTION_FILTER_SMOOTH_DELTA, float(smooth_delta));
        }
 
        temporal_filter(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_TEMPORAL_FILTER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_temporal_filter_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(pb);
 
            return block;
        }
    };
 
    class spatial_filter : public filter
    {
    public:
        spatial_filter() : filter(init(), 1) { }

        spatial_filter(float smooth_alpha, float smooth_delta, float magnitude, float hole_fill) : filter(init(), 1)
        {
            set_option(RS2_OPTION_FILTER_SMOOTH_ALPHA, float(smooth_alpha));
            set_option(RS2_OPTION_FILTER_SMOOTH_DELTA, float(smooth_delta));
            set_option(RS2_OPTION_FILTER_MAGNITUDE, magnitude);
            set_option(RS2_OPTION_HOLES_FILL, hole_fill);
        }
 
        spatial_filter(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_SPATIAL_FILTER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_spatial_filter_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(pb);
 
            return block;
        }
    };
 
    class disparity_transform : public filter
    {
    public:
        disparity_transform(bool transform_to_disparity = true) : filter(init(transform_to_disparity), 1) { }
 
        disparity_transform(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_DISPARITY_FILTER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
    private:
        friend class context;
        std::shared_ptr<rs2_processing_block> init(bool transform_to_disparity)
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_disparity_transform_block(uint8_t(transform_to_disparity), &e),
                rs2_delete_processing_block);
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(pb);
 
            return block;
        }
    };
 
    class depth_huffman_decoder : public filter
    {
    public:
        depth_huffman_decoder() : filter(init())
        {}
 
        depth_huffman_decoder(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_DEPTH_HUFFMAN_DECODER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
 
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_huffman_depth_decompress_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class hole_filling_filter : public filter
    {
    public:
        hole_filling_filter() : filter(init(), 1) {}

        hole_filling_filter(int mode) : filter(init(), 1)
        {
            set_option(RS2_OPTION_HOLES_FILL, float(mode));
        }
 
        hole_filling_filter(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_HOLE_FILLING_FILTER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_hole_filling_filter_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            // Redirect options API to the processing block
            //options::operator=(_block);
 
            return block;
        }
    };
 
    class rates_printer : public filter
    {
    public:
        rates_printer() : filter(init(), 1) {}
 
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_rates_printer_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class hdr_merge : public filter
    {
    public:
        hdr_merge() : filter(init()) {}
 
        hdr_merge(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_HDR_MERGE, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
 
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_hdr_merge_processing_block(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
    class sequence_id_filter : public filter
    {
    public:
        sequence_id_filter() : filter(init()) {}

        sequence_id_filter(float sequence_id) : filter(init(), 1)
        {
            set_option(RS2_OPTION_SEQUENCE_ID, sequence_id);
        }
 
        sequence_id_filter(filter f) :filter(f)
        {
            rs2_error* e = nullptr;
            if (!rs2_is_processing_block_extendable_to(f.get(), RS2_EXTENSION_SEQUENCE_ID_FILTER, &e) && !e)
            {
                _block.reset();
            }
            error::handle(e);
        }
 
    private:
        friend class context;
 
        std::shared_ptr<rs2_processing_block> init()
        {
            rs2_error* e = nullptr;
            auto block = std::shared_ptr<rs2_processing_block>(
                rs2_create_sequence_id_filter(&e),
                rs2_delete_processing_block);
            error::handle(e);
 
            return block;
        }
    };
 
 
    class embedded_filter : public options
    {
    public:
        embedded_filter(std::shared_ptr<rs2_embedded_filter> filter)
            : _embedded_filter(filter)
            , options((rs2_options*)filter.get())
        {
        }
 
        rs2_embedded_filter_type get_type() const
        {
            rs2_error* e = nullptr;
            auto filter_type = rs2_get_embedded_filter_type(_embedded_filter.get(), &e);
            error::handle(e);
            return filter_type;
        }
 
        operator bool() const
        {
            return _embedded_filter != nullptr;
        }
 
        const std::shared_ptr<rs2_embedded_filter>& get() const
        {
            return _embedded_filter;
        }
 
        template<class T>
        bool is() const
        {
            T extension(*this);
            return extension;
        }
 
        template<class T>
        T as() const
        {
            T extension(*this);
            return extension;
        }
 
    protected:
        std::shared_ptr<rs2_embedded_filter> _embedded_filter;
    };
 
    class embedded_decimation_filter : public embedded_filter
    {
    public:
        embedded_decimation_filter(embedded_filter filter)
            : embedded_filter(filter.get())
        {
            rs2_error* e = nullptr;
            if (!_embedded_filter || (rs2_is_embedded_filter_extendable_to(_embedded_filter.get(), 
                RS2_EXTENSION_DECIMATION_EMBEDDED_FILTER, &e) == 0 && !e))
            {
                _embedded_filter.reset();
            }
            error::handle(e);
        }
        operator bool() const { return _embedded_filter.get() != nullptr; }
    };
 
    class embedded_temporal_filter : public embedded_filter
    {
    public:
        embedded_temporal_filter(embedded_filter filter)
            : embedded_filter(filter.get())
        {
            rs2_error* e = nullptr;
            if (!_embedded_filter || (rs2_is_embedded_filter_extendable_to(_embedded_filter.get(), 
                RS2_EXTENSION_TEMPORAL_EMBEDDED_FILTER, &e) == 0 && !e))
            {
                _embedded_filter.reset();
            }
            error::handle(e);
        }
        operator bool() const { return _embedded_filter.get() != nullptr; }
    };
}
#endif // LIBREALSENSE_RS2_PROCESSING_HPP