4_user_synchronous_all.cpp

// ------------------------- OpenPose Library Tutorial - Wrapper - Example 2 - Synchronous -------------------------
// Synchronous mode: ideal for performance. The user can add his own frames producer / post-processor / consumer to the OpenPose wrapper or use the
// default ones.

// This example shows the user how to use the OpenPose wrapper class:
    // 1. User reads images
    // 2. Extract and render keypoint / heatmap / PAF of that image
    // 3. Save the results on disk
    // 4. User displays the rendered pose
    // Everything in a multi-thread scenario
// In addition to the previous OpenPose modules, we also need to use:
    // 1. `core` module:
        // For the Array<float> class that the `pose` module needs
        // For the Datum struct that the `thread` module sends between the queues
    // 2. `utilities` module: for the error & logging functions, i.e. op::error & op::log respectively
// This file should only be used for the user to take specific examples.

// C++ std library dependencies
#include <chrono> // `std::chrono::` functions and classes, e.g. std::chrono::milliseconds
#include <thread> // std::this_thread
// Other 3rdparty dependencies
// GFlags: DEFINE_bool, _int32, _int64, _uint64, _double, _string
#include <gflags/gflags.h>
// Allow Google Flags in Ubuntu 14
#ifndef GFLAGS_GFLAGS_H_
    namespace gflags = google;
#endif
// OpenPose dependencies
#include <openpose/headers.hpp>

// See all the available parameter options withe the `--help` flag. E.g. `build/examples/openpose/openpose.bin --help`
// Note: This command will show you flags for other unnecessary 3rdparty files. Check only the flags for the OpenPose
// executable. E.g. for `openpose.bin`, look for `Flags from examples/openpose/openpose.cpp:`.
// Debugging/Other
DEFINE_int32(logging_level,             3,              "The logging level. Integer in the range [0, 255]. 0 will output any log() message, while"
                                                        " 255 will not output any. Current OpenPose library messages are in the range 0-4: 1 for"
                                                        " low priority messages and 4 for important ones.");
DEFINE_bool(disable_multi_thread,       false,          "It would slightly reduce the frame rate in order to highly reduce the lag. Mainly useful"
                                                        " for 1) Cases where it is needed a low latency (e.g. webcam in real-time scenarios with"
                                                        " low-range GPU devices); and 2) Debugging OpenPose when it is crashing to locate the"
                                                        " error.");
DEFINE_int32(profile_speed,             1000,           "If PROFILER_ENABLED was set in CMake or Makefile.config files, OpenPose will show some"
                                                        " runtime statistics at this frame number.");
// Producer
DEFINE_string(image_dir,                "examples/media/",      "Process a directory of images. Read all standard formats (jpg, png, bmp, etc.).");
DEFINE_double(camera_fps,               30.0,           "Frame rate for the webcam (also used when saving video). Set this value to the minimum"
                                                        " value between the OpenPose displayed speed and the webcam real frame rate.");
// OpenPose
DEFINE_string(model_folder,             "models/",      "Folder path (absolute or relative) where the models (pose, face, ...) are located.");
DEFINE_string(output_resolution,        "-1x-1",        "The image resolution (display and output). Use \"-1x-1\" to force the program to use the"
                                                        " input image resolution.");
DEFINE_int32(num_gpu,                   -1,             "The number of GPU devices to use. If negative, it will use all the available GPUs in your"
                                                        " machine.");
DEFINE_int32(num_gpu_start,             0,              "GPU device start number.");
DEFINE_int32(keypoint_scale,            0,              "Scaling of the (x,y) coordinates of the final pose data array, i.e. the scale of the (x,y)"
                                                        " coordinates that will be saved with the `write_json` & `write_keypoint` flags."
                                                        " Select `0` to scale it to the original source resolution; `1`to scale it to the net output"
                                                        " size (set with `net_resolution`); `2` to scale it to the final output size (set with"
                                                        " `resolution`); `3` to scale it in the range [0,1], where (0,0) would be the top-left"
                                                        " corner of the image, and (1,1) the bottom-right one; and 4 for range [-1,1], where"
                                                        " (-1,-1) would be the top-left corner of the image, and (1,1) the bottom-right one. Non"
                                                        " related with `scale_number` and `scale_gap`.");
DEFINE_int32(number_people_max,         -1,             "This parameter will limit the maximum number of people detected, by keeping the people with"
                                                        " top scores. The score is based in person area over the image, body part score, as well as"
                                                        " joint score (between each pair of connected body parts). Useful if you know the exact"
                                                        " number of people in the scene, so it can remove false positives (if all the people have"
                                                        " been detected. However, it might also include false negatives by removing very small or"
                                                        " highly occluded people. -1 will keep them all.");
// OpenPose Body Pose
DEFINE_bool(body_disable,               false,          "Disable body keypoint detection. Option only possible for faster (but less accurate) face"
                                                        " keypoint detection.");
DEFINE_string(model_pose,               "BODY_25",      "Model to be used. E.g. `COCO` (18 keypoints), `MPI` (15 keypoints, ~10% faster), "
                                                        "`MPI_4_layers` (15 keypoints, even faster but less accurate).");
DEFINE_string(net_resolution,           "-1x368",       "Multiples of 16. If it is increased, the accuracy potentially increases. If it is"
                                                        " decreased, the speed increases. For maximum speed-accuracy balance, it should keep the"
                                                        " closest aspect ratio possible to the images or videos to be processed. Using `-1` in"
                                                        " any of the dimensions, OP will choose the optimal aspect ratio depending on the user's"
                                                        " input value. E.g. the default `-1x368` is equivalent to `656x368` in 16:9 resolutions,"
                                                        " e.g. full HD (1980x1080) and HD (1280x720) resolutions.");
DEFINE_int32(scale_number,              1,              "Number of scales to average.");
DEFINE_double(scale_gap,                0.3,            "Scale gap between scales. No effect unless scale_number > 1. Initial scale is always 1."
                                                        " If you want to change the initial scale, you actually want to multiply the"
                                                        " `net_resolution` by your desired initial scale.");
// OpenPose Body Pose Heatmaps and Part Candidates
DEFINE_bool(heatmaps_add_parts,         false,          "If true, it will fill op::Datum::poseHeatMaps array with the body part heatmaps, and"
                                                        " analogously face & hand heatmaps to op::Datum::faceHeatMaps & op::Datum::handHeatMaps."
                                                        " If more than one `add_heatmaps_X` flag is enabled, it will place then in sequential"
                                                        " memory order: body parts + bkg + PAFs. It will follow the order on"
                                                        " POSE_BODY_PART_MAPPING in `src/openpose/pose/poseParameters.cpp`. Program speed will"
                                                        " considerably decrease. Not required for OpenPose, enable it only if you intend to"
                                                        " explicitly use this information later.");
DEFINE_bool(heatmaps_add_bkg,           false,          "Same functionality as `add_heatmaps_parts`, but adding the heatmap corresponding to"
                                                        " background.");
DEFINE_bool(heatmaps_add_PAFs,          false,          "Same functionality as `add_heatmaps_parts`, but adding the PAFs.");
DEFINE_int32(heatmaps_scale,            2,              "Set 0 to scale op::Datum::poseHeatMaps in the range [-1,1], 1 for [0,1]; 2 for integer"
                                                        " rounded [0,255]; and 3 for no scaling.");
DEFINE_bool(part_candidates,            false,          "Also enable `write_json` in order to save this information. If true, it will fill the"
                                                        " op::Datum::poseCandidates array with the body part candidates. Candidates refer to all"
                                                        " the detected body parts, before being assembled into people. Note that the number of"
                                                        " candidates is equal or higher than the number of final body parts (i.e. after being"
                                                        " assembled into people). The empty body parts are filled with 0s. Program speed will"
                                                        " slightly decrease. Not required for OpenPose, enable it only if you intend to explicitly"
                                                        " use this information.");
// OpenPose Face
DEFINE_bool(face,                       false,          "Enables face keypoint detection. It will share some parameters from the body pose, e.g."
                                                        " `model_folder`. Note that this will considerable slow down the performance and increse"
                                                        " the required GPU memory. In addition, the greater number of people on the image, the"
                                                        " slower OpenPose will be.");
DEFINE_string(face_net_resolution,      "368x368",      "Multiples of 16 and squared. Analogous to `net_resolution` but applied to the face keypoint"
                                                        " detector. 320x320 usually works fine while giving a substantial speed up when multiple"
                                                        " faces on the image.");
// OpenPose Hand
DEFINE_bool(hand,                       false,          "Enables hand keypoint detection. It will share some parameters from the body pose, e.g."
                                                        " `model_folder`. Analogously to `--face`, it will also slow down the performance, increase"
                                                        " the required GPU memory and its speed depends on the number of people.");
DEFINE_string(hand_net_resolution,      "368x368",      "Multiples of 16 and squared. Analogous to `net_resolution` but applied to the hand keypoint"
                                                        " detector.");
DEFINE_int32(hand_scale_number,         1,              "Analogous to `scale_number` but applied to the hand keypoint detector. Our best results"
                                                        " were found with `hand_scale_number` = 6 and `hand_scale_range` = 0.4.");
DEFINE_double(hand_scale_range,         0.4,            "Analogous purpose than `scale_gap` but applied to the hand keypoint detector. Total range"
                                                        " between smallest and biggest scale. The scales will be centered in ratio 1. E.g. if"
                                                        " scaleRange = 0.4 and scalesNumber = 2, then there will be 2 scales, 0.8 and 1.2.");
DEFINE_bool(hand_tracking,              false,          "Adding hand tracking might improve hand keypoints detection for webcam (if the frame rate"
                                                        " is high enough, i.e. >7 FPS per GPU) and video. This is not person ID tracking, it"
                                                        " simply looks for hands in positions at which hands were located in previous frames, but"
                                                        " it does not guarantee the same person ID among frames.");
// OpenPose 3-D Reconstruction
DEFINE_bool(3d,                         false,          "Running OpenPose 3-D reconstruction demo: 1) Reading from a stereo camera system."
                                                        " 2) Performing 3-D reconstruction from the multiple views. 3) Displaying 3-D reconstruction"
                                                        " results. Note that it will only display 1 person. If multiple people is present, it will"
                                                        " fail.");
DEFINE_int32(3d_min_views,              -1,             "Minimum number of views required to reconstruct each keypoint. By default (-1), it will"
                                                        " require all the cameras to see the keypoint in order to reconstruct it.");
DEFINE_int32(3d_views,                  1,              "Complementary option to `--image_dir` or `--video`. OpenPose will read as many images per"
                                                        " iteration, allowing tasks such as stereo camera processing (`--3d`). Note that"
                                                        " `--camera_parameters_folder` must be set. OpenPose must find as many `xml` files in the"
                                                        " parameter folder as this number indicates.");
// Extra algorithms
DEFINE_bool(identification,             false,          "Experimental, not available yet. Whether to enable people identification across frames.");
DEFINE_int32(tracking,                  -1,             "Experimental, not available yet. Whether to enable people tracking across frames. The"
                                                        " value indicates the number of frames where tracking is run between each OpenPose keypoint"
                                                        " detection. Select -1 (default) to disable it or 0 to run simultaneously OpenPose keypoint"
                                                        " detector and tracking for potentially higher accurary than only OpenPose.");
DEFINE_int32(ik_threads,                0,              "Experimental, not available yet. Whether to enable inverse kinematics (IK) from 3-D"
                                                        " keypoints to obtain 3-D joint angles. By default (0 threads), it is disabled. Increasing"
                                                        " the number of threads will increase the speed but also the global system latency.");
// OpenPose Rendering
DEFINE_int32(part_to_show,              0,              "Prediction channel to visualize (default: 0). 0 for all the body parts, 1-18 for each body"
                                                        " part heat map, 19 for the background heat map, 20 for all the body part heat maps"
                                                        " together, 21 for all the PAFs, 22-40 for each body part pair PAF.");
DEFINE_bool(disable_blending,           false,          "If enabled, it will render the results (keypoint skeletons or heatmaps) on a black"
                                                        " background, instead of being rendered into the original image. Related: `part_to_show`,"
                                                        " `alpha_pose`, and `alpha_pose`.");
// OpenPose Rendering Pose
DEFINE_double(render_threshold,         0.05,           "Only estimated keypoints whose score confidences are higher than this threshold will be"
                                                        " rendered. Generally, a high threshold (> 0.5) will only render very clear body parts;"
                                                        " while small thresholds (~0.1) will also output guessed and occluded keypoints, but also"
                                                        " more false positives (i.e. wrong detections).");
DEFINE_int32(render_pose,               -1,             "Set to 0 for no rendering, 1 for CPU rendering (slightly faster), and 2 for GPU rendering"
                                                        " (slower but greater functionality, e.g. `alpha_X` flags). If -1, it will pick CPU if"
                                                        " CPU_ONLY is enabled, or GPU if CUDA is enabled. If rendering is enabled, it will render"
                                                        " both `outputData` and `cvOutputData` with the original image and desired body part to be"
                                                        " shown (i.e. keypoints, heat maps or PAFs).");
DEFINE_double(alpha_pose,               0.6,            "Blending factor (range 0-1) for the body part rendering. 1 will show it completely, 0 will"
                                                        " hide it. Only valid for GPU rendering.");
DEFINE_double(alpha_heatmap,            0.7,            "Blending factor (range 0-1) between heatmap and original frame. 1 will only show the"
                                                        " heatmap, 0 will only show the frame. Only valid for GPU rendering.");
// OpenPose Rendering Face
DEFINE_double(face_render_threshold,    0.4,            "Analogous to `render_threshold`, but applied to the face keypoints.");
DEFINE_int32(face_render,               -1,             "Analogous to `render_pose` but applied to the face. Extra option: -1 to use the same"
                                                        " configuration that `render_pose` is using.");
DEFINE_double(face_alpha_pose,          0.6,            "Analogous to `alpha_pose` but applied to face.");
DEFINE_double(face_alpha_heatmap,       0.7,            "Analogous to `alpha_heatmap` but applied to face.");
// OpenPose Rendering Hand
DEFINE_double(hand_render_threshold,    0.2,            "Analogous to `render_threshold`, but applied to the hand keypoints.");
DEFINE_int32(hand_render,               -1,             "Analogous to `render_pose` but applied to the hand. Extra option: -1 to use the same"
                                                        " configuration that `render_pose` is using.");
DEFINE_double(hand_alpha_pose,          0.6,            "Analogous to `alpha_pose` but applied to hand.");
DEFINE_double(hand_alpha_heatmap,       0.7,            "Analogous to `alpha_heatmap` but applied to hand.");
// Result Saving
DEFINE_string(write_images,             "",             "Directory to write rendered frames in `write_images_format` image format.");
DEFINE_string(write_images_format,      "png",          "File extension and format for `write_images`, e.g. png, jpg or bmp. Check the OpenCV"
                                                        " function cv::imwrite for all compatible extensions.");
DEFINE_string(write_video,              "",             "Full file path to write rendered frames in motion JPEG video format. It might fail if the"
                                                        " final path does not finish in `.avi`. It internally uses cv::VideoWriter. Flag"
                                                        " `camera_fps` controls FPS.");
DEFINE_string(write_json,               "",             "Directory to write OpenPose output in JSON format. It includes body, hand, and face pose"
                                                        " keypoints (2-D and 3-D), as well as pose candidates (if `--part_candidates` enabled).");
DEFINE_string(write_coco_json,          "",             "Full file path to write people pose data with JSON COCO validation format.");
DEFINE_string(write_coco_foot_json,     "",             "Full file path to write people foot pose data with JSON COCO validation format.");
DEFINE_string(write_heatmaps,           "",             "Directory to write body pose heatmaps in PNG format. At least 1 `add_heatmaps_X` flag"
                                                        " must be enabled.");
DEFINE_string(write_heatmaps_format,    "png",          "File extension and format for `write_heatmaps`, analogous to `write_images_format`."
                                                        " For lossless compression, recommended `png` for integer `heatmaps_scale` and `float` for"
                                                        " floating values.");
DEFINE_string(write_keypoint,           "",             "(Deprecated, use `write_json`) Directory to write the people pose keypoint data. Set format"
                                                        " with `write_keypoint_format`.");
DEFINE_string(write_keypoint_format,    "yml",          "(Deprecated, use `write_json`) File extension and format for `write_keypoint`: json, xml,"
                                                        " yaml & yml. Json not available for OpenCV < 3.0, use `write_json` instead.");
// Result Saving - Extra Algorithms
DEFINE_string(write_video_adam,         "",             "Experimental, not available yet. E.g.: `~/Desktop/adamResult.avi`. Flag `camera_fps`"
                                                        " controls FPS.");
DEFINE_string(write_bvh,                "",             "Experimental, not available yet. E.g.: `~/Desktop/mocapResult.bvh`.");
// UDP communication
DEFINE_string(udp_host,                 "",             "Experimental, not available yet. IP for UDP communication. E.g., `192.168.0.1`.");
DEFINE_string(udp_port,                 "8051",         "Experimental, not available yet. Port number for UDP communication.");


// If the user needs his own variables, he can inherit the op::Datum struct and add them
// UserDatum can be directly used by the OpenPose wrapper because it inherits from op::Datum, just define
// Wrapper<UserDatum> instead of Wrapper<op::Datum>
struct UserDatum : public op::Datum
{
    bool boolThatUserNeedsForSomeReason;

    UserDatum(const bool boolThatUserNeedsForSomeReason_ = false) :
        boolThatUserNeedsForSomeReason{boolThatUserNeedsForSomeReason_}
    {}
};

// The W-classes can be implemented either as a template or as simple classes given
// that the user usually knows which kind of data he will move between the queues,
// in this case we assume a std::shared_ptr of a std::vector of UserDatum

// This worker will just read and return all the jpg files in a directory
class WUserInput : public op::WorkerProducer<std::shared_ptr<std::vector<UserDatum>>>
{
public:
    WUserInput(const std::string& directoryPath) :
        mImageFiles{op::getFilesOnDirectory(directoryPath, "jpg")},
        // If we want "jpg" + "png" images
        // mImageFiles{op::getFilesOnDirectory(directoryPath, std::vector<std::string>{"jpg", "png"})},
        mCounter{0}
    {
        if (mImageFiles.empty())
            op::error("No images found on: " + directoryPath, __LINE__, __FUNCTION__, __FILE__);
    }

    void initializationOnThread() {}

    std::shared_ptr<std::vector<UserDatum>> workProducer()
    {
        try
        {
            // Close program when empty frame
            if (mImageFiles.size() <= mCounter)
            {
                op::log("Last frame read and added to queue. Closing program after it is processed.",
                        op::Priority::High);
                // This funtion stops this worker, which will eventually stop the whole thread system once all the
                // frames have been processed
                this->stop();
                return nullptr;
            }
            else
            {
                // Create new datum
                auto datumsPtr = std::make_shared<std::vector<UserDatum>>();
                datumsPtr->emplace_back();
                auto& datum = datumsPtr->at(0);

                // Fill datum
                datum.cvInputData = cv::imread(mImageFiles.at(mCounter++));

                // If empty frame -> return nullptr
                if (datum.cvInputData.empty())
                {
                    op::log("Empty frame detected on path: " + mImageFiles.at(mCounter-1) + ". Closing program.",
                        op::Priority::High);
                    this->stop();
                    datumsPtr = nullptr;
                }

                return datumsPtr;
            }
        }
        catch (const std::exception& e)
        {
            this->stop();
            op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
            return nullptr;
        }
    }

private:
    const std::vector<std::string> mImageFiles;
    unsigned long long mCounter;
};

// This worker will just invert the image
class WUserPostProcessing : public op::Worker<std::shared_ptr<std::vector<UserDatum>>>
{
public:
    WUserPostProcessing()
    {
        // User's constructor here
    }

    void initializationOnThread() {}

    void work(std::shared_ptr<std::vector<UserDatum>>& datumsPtr)
    {
        // User's post-processing (after OpenPose processing & before OpenPose outputs) here
            // datum.cvOutputData: rendered frame with pose or heatmaps
            // datum.poseKeypoints: Array<float> with the estimated pose
        try
        {
            if (datumsPtr != nullptr && !datumsPtr->empty())
                for (auto& datum : *datumsPtr)
                    cv::bitwise_not(datum.cvOutputData, datum.cvOutputData);
        }
        catch (const std::exception& e)
        {
            this->stop();
            op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
        }
    }
};

// This worker will just read and return all the jpg files in a directory
class WUserOutput : public op::WorkerConsumer<std::shared_ptr<std::vector<UserDatum>>>
{
public:
    void initializationOnThread() {}

    void workConsumer(const std::shared_ptr<std::vector<UserDatum>>& datumsPtr)
    {
        try
        {
            // User's displaying/saving/other processing here
                // datum.cvOutputData: rendered frame with pose or heatmaps
                // datum.poseKeypoints: Array<float> with the estimated pose
            if (datumsPtr != nullptr && !datumsPtr->empty())
            {
                // Show in command line the resulting pose keypoints for body, face and hands
                op::log("\nKeypoints:");
                // Accesing each element of the keypoints
                const auto& poseKeypoints = datumsPtr->at(0).poseKeypoints;
                op::log("Person pose keypoints:");
                for (auto person = 0 ; person < poseKeypoints.getSize(0) ; person++)
                {
                    op::log("Person " + std::to_string(person) + " (x, y, score):");
                    for (auto bodyPart = 0 ; bodyPart < poseKeypoints.getSize(1) ; bodyPart++)
                    {
                        std::string valueToPrint;
                        for (auto xyscore = 0 ; xyscore < poseKeypoints.getSize(2) ; xyscore++)
                        {
                            valueToPrint += std::to_string(   poseKeypoints[{person, bodyPart, xyscore}]   ) + " ";
                        }
                        op::log(valueToPrint);
                    }
                }
                op::log(" ");
                // Alternative: just getting std::string equivalent
                op::log("Face keypoints: " + datumsPtr->at(0).faceKeypoints.toString());
                op::log("Left hand keypoints: " + datumsPtr->at(0).handKeypoints[0].toString());
                op::log("Right hand keypoints: " + datumsPtr->at(0).handKeypoints[1].toString());
                // Heatmaps
                const auto& poseHeatMaps = datumsPtr->at(0).poseHeatMaps;
                if (!poseHeatMaps.empty())
                {
                    op::log("Pose heatmaps size: [" + std::to_string(poseHeatMaps.getSize(0)) + ", "
                            + std::to_string(poseHeatMaps.getSize(1)) + ", "
                            + std::to_string(poseHeatMaps.getSize(2)) + "]");
                    const auto& faceHeatMaps = datumsPtr->at(0).faceHeatMaps;
                    op::log("Face heatmaps size: [" + std::to_string(faceHeatMaps.getSize(0)) + ", "
                            + std::to_string(faceHeatMaps.getSize(1)) + ", "
                            + std::to_string(faceHeatMaps.getSize(2)) + ", "
                            + std::to_string(faceHeatMaps.getSize(3)) + "]");
                    const auto& handHeatMaps = datumsPtr->at(0).handHeatMaps;
                    op::log("Left hand heatmaps size: [" + std::to_string(handHeatMaps[0].getSize(0)) + ", "
                            + std::to_string(handHeatMaps[0].getSize(1)) + ", "
                            + std::to_string(handHeatMaps[0].getSize(2)) + ", "
                            + std::to_string(handHeatMaps[0].getSize(3)) + "]");
                    op::log("Right hand heatmaps size: [" + std::to_string(handHeatMaps[1].getSize(0)) + ", "
                            + std::to_string(handHeatMaps[1].getSize(1)) + ", "
                            + std::to_string(handHeatMaps[1].getSize(2)) + ", "
                            + std::to_string(handHeatMaps[1].getSize(3)) + "]");
                }

                // Display rendered output image
                cv::imshow("User worker GUI", datumsPtr->at(0).cvOutputData);
                // Display image and sleeps at least 1 ms (it usually sleeps ~5-10 msec to display the image)
                const char key = (char)cv::waitKey(1);
                if (key == 27)
                    this->stop();
            }
        }
        catch (const std::exception& e)
        {
            this->stop();
            op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
        }
    }
};

int openPoseTutorialWrapper2()
{
    try
    {
        op::log("Starting OpenPose demo...", op::Priority::High);
        const auto timerBegin = std::chrono::high_resolution_clock::now();

        // logging_level
        op::check(0 <= FLAGS_logging_level && FLAGS_logging_level <= 255, "Wrong logging_level value.",
                  __LINE__, __FUNCTION__, __FILE__);
        op::ConfigureLog::setPriorityThreshold((op::Priority)FLAGS_logging_level);
        op::Profiler::setDefaultX(FLAGS_profile_speed);

        // Applying user defined configuration - Google flags to program variables
        // outputSize
        const auto outputSize = op::flagsToPoint(FLAGS_output_resolution, "-1x-1");
        // netInputSize
        const auto netInputSize = op::flagsToPoint(FLAGS_net_resolution, "-1x368");
        // faceNetInputSize
        const auto faceNetInputSize = op::flagsToPoint(FLAGS_face_net_resolution, "368x368 (multiples of 16)");
        // handNetInputSize
        const auto handNetInputSize = op::flagsToPoint(FLAGS_hand_net_resolution, "368x368 (multiples of 16)");
        // poseModel
        const auto poseModel = op::flagsToPoseModel(FLAGS_model_pose);
        // JSON saving
        if (!FLAGS_write_keypoint.empty())
            op::log("Flag `write_keypoint` is deprecated and will eventually be removed."
                    " Please, use `write_json` instead.", op::Priority::Max);
        // keypointScale
        const auto keypointScale = op::flagsToScaleMode(FLAGS_keypoint_scale);
        // heatmaps to add
        const auto heatMapTypes = op::flagsToHeatMaps(FLAGS_heatmaps_add_parts, FLAGS_heatmaps_add_bkg,
                                                      FLAGS_heatmaps_add_PAFs);
        const auto heatMapScale = op::flagsToHeatMapScaleMode(FLAGS_heatmaps_scale);
        // >1 camera view?
        const auto multipleView = (FLAGS_3d || FLAGS_3d_views > 1);
        // Enabling Google Logging
        const bool enableGoogleLogging = true;
        // Logging
        op::log("", op::Priority::Low, __LINE__, __FUNCTION__, __FILE__);

        // Initializing the user custom classes
        // Frames producer (e.g. video, webcam, ...)
        auto wUserInput = std::make_shared<WUserInput>(FLAGS_image_dir);
        // Processing
        auto wUserPostProcessing = std::make_shared<WUserPostProcessing>();
        // GUI (Display)
        auto wUserOutput = std::make_shared<WUserOutput>();

        op::Wrapper<std::vector<UserDatum>> opWrapper;
        // Add custom input
        const auto workerInputOnNewThread = false;
        opWrapper.setWorkerInput(wUserInput, workerInputOnNewThread);
        // Add custom processing
        const auto workerProcessingOnNewThread = false;
        opWrapper.setWorkerPostProcessing(wUserPostProcessing, workerProcessingOnNewThread);
        // Add custom output
        const auto workerOutputOnNewThread = true;
        opWrapper.setWorkerOutput(wUserOutput, workerOutputOnNewThread);
        // Configure OpenPose
        op::log("Configuring OpenPose wrapper...", op::Priority::Low, __LINE__, __FUNCTION__, __FILE__);
        const op::WrapperStructPose wrapperStructPose{
            !FLAGS_body_disable, netInputSize, outputSize, keypointScale, FLAGS_num_gpu, FLAGS_num_gpu_start,
            FLAGS_scale_number, (float)FLAGS_scale_gap, op::flagsToRenderMode(FLAGS_render_pose, multipleView),
            poseModel, !FLAGS_disable_blending, (float)FLAGS_alpha_pose, (float)FLAGS_alpha_heatmap,
            FLAGS_part_to_show, FLAGS_model_folder, heatMapTypes, heatMapScale, FLAGS_part_candidates,
            (float)FLAGS_render_threshold, FLAGS_number_people_max, enableGoogleLogging};
        // Face configuration (use op::WrapperStructFace{} to disable it)
        const op::WrapperStructFace wrapperStructFace{
            FLAGS_face, faceNetInputSize, op::flagsToRenderMode(FLAGS_face_render, multipleView, FLAGS_render_pose),
            (float)FLAGS_face_alpha_pose, (float)FLAGS_face_alpha_heatmap, (float)FLAGS_face_render_threshold};
        // Hand configuration (use op::WrapperStructHand{} to disable it)
        const op::WrapperStructHand wrapperStructHand{
            FLAGS_hand, handNetInputSize, FLAGS_hand_scale_number, (float)FLAGS_hand_scale_range, FLAGS_hand_tracking,
            op::flagsToRenderMode(FLAGS_hand_render, multipleView, FLAGS_render_pose), (float)FLAGS_hand_alpha_pose,
            (float)FLAGS_hand_alpha_heatmap, (float)FLAGS_hand_render_threshold};
        // Extra functionality configuration (use op::WrapperStructExtra{} to disable it)
        const op::WrapperStructExtra wrapperStructExtra{
            FLAGS_3d, FLAGS_3d_min_views, FLAGS_identification, FLAGS_tracking, FLAGS_ik_threads};
        // Consumer (comment or use default argument to disable any output)
        const auto displayMode = op::DisplayMode::NoDisplay;
        const bool guiVerbose = false;
        const bool fullScreen = false;
        const op::WrapperStructOutput wrapperStructOutput{
            displayMode, guiVerbose, fullScreen, FLAGS_write_keypoint,
            op::stringToDataFormat(FLAGS_write_keypoint_format), FLAGS_write_json, FLAGS_write_coco_json,
            FLAGS_write_coco_foot_json, FLAGS_write_images, FLAGS_write_images_format, FLAGS_write_video,
            FLAGS_camera_fps, FLAGS_write_heatmaps, FLAGS_write_heatmaps_format, FLAGS_write_video_adam,
            FLAGS_write_bvh, FLAGS_udp_host, FLAGS_udp_port};
        // Configure wrapper
        opWrapper.configure(wrapperStructPose, wrapperStructFace, wrapperStructHand, wrapperStructExtra,
                            op::WrapperStructInput{}, wrapperStructOutput);
        // Set to single-thread running (to debug and/or reduce latency)
        if (FLAGS_disable_multi_thread)
            opWrapper.disableMultiThreading();

        op::log("Starting thread(s)...", op::Priority::High);
        // Two different ways of running the program on multithread environment
        // Option a) Recommended - Also using the main thread (this thread) for processing (it saves 1 thread)
        // Start, run & stop threads - it blocks this thread until all others have finished
        opWrapper.exec();

        // Option b) Keeping this thread free in case you want to do something else meanwhile, e.g. profiling the GPU memory
        // // VERY IMPORTANT NOTE: if OpenCV is compiled with Qt support, this option will not work. Qt needs the main
        // // thread to plot visual results, so the final GUI (which uses OpenCV) would return an exception similar to:
        // // `QMetaMethod::invoke: Unable to invoke methods with return values in queued connections`
        // // Start threads
        // opWrapper.start();
        // // Profile used GPU memory
        //     // 1: wait ~10sec so the memory has been totally loaded on GPU
        //     // 2: profile the GPU memory
        // std::this_thread::sleep_for(std::chrono::milliseconds{1000});
        // op::log("Random task here...", op::Priority::High);
        // // Keep program alive while running threads
        // while (opWrapper.isRunning())
        //     std::this_thread::sleep_for(std::chrono::milliseconds{33});
        // // Stop and join threads
        // op::log("Stopping thread(s)", op::Priority::High);
        // opWrapper.stop();

        // Measuring total time
        const auto now = std::chrono::high_resolution_clock::now();
        const auto totalTimeSec = (double)std::chrono::duration_cast<std::chrono::nanoseconds>(now-timerBegin).count()
                                * 1e-9;
        const auto message = "OpenPose demo successfully finished. Total time: "
                           + std::to_string(totalTimeSec) + " seconds.";
        op::log(message, op::Priority::High);

        // Return successful message
        return 0;
    }
    catch (const std::exception& e)
    {
        op::error(e.what(), __LINE__, __FUNCTION__, __FILE__);
        return -1;
    }
}

int main(int argc, char *argv[])
{
    // Parsing command line flags
    gflags::ParseCommandLineFlags(&argc, &argv, true);

    // Running openPoseTutorialWrapper2
    return openPoseTutorialWrapper2();
}