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samples/app_des_sample.cpp

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+#include "../nodes/vp_file_src_node.h"
+#include "../nodes/infers/vp_yunet_face_detector_node.h"
+#include "../nodes/osd/vp_face_osd_node.h"
+#include "../nodes/vp_app_des_node.h"
+
+#include "../utils/analysis_board/vp_analysis_board.h"
+
+/*
+* ## app_des_sample ##
+* 1. reading video from file
+* 2. detect faces and draw results
+* 3. display on screen in host code using cv::imshow(...)
+* using vp_app_des_node INSTEAD OF vp_screen_des_node for displaying.
+*/
+
+int main() {
+    VP_SET_LOG_LEVEL(vp_utils::vp_log_level::INFO);
+    VP_LOGGER_INIT();
+
+    // create nodes
+    auto file_src_0 = std::make_shared<vp_nodes::vp_file_src_node>("file_src_0", 0, "./vp_data/test_video/face.mp4");
+    auto yunet_face_detector_0 = std::make_shared<vp_nodes::vp_yunet_face_detector_node>("yunet_face_detector_0", "./vp_data/models/face/face_detection_yunet_2022mar.onnx");
+    auto osd_0 = std::make_shared<vp_nodes::vp_face_osd_node>("osd_0");
+    auto app_des_0 = std::make_shared<vp_nodes::vp_app_des_node>("app_des_0", 0);
+
+    // register callback to display result
+    std::string ori_win_title = "original frame using cv::imshow(...)";
+    std::string osd_win_title = "osd frame using cv::imshow(...)";
+    cv::namedWindow(ori_win_title,cv::WindowFlags::WINDOW_NORMAL);
+    cv::namedWindow(osd_win_title,cv::WindowFlags::WINDOW_NORMAL);
+    app_des_0->set_app_des_result_hooker([&](std::string node_name, std::shared_ptr<vp_objects::vp_meta> meta) {
+        // only deal with frame meta
+        if (meta->meta_type == vp_objects::vp_meta_type::FRAME) {
+            auto frame_meta = std::dynamic_pointer_cast<vp_objects::vp_frame_meta>(meta);
+            cv::imshow(ori_win_title, frame_meta->frame);
+
+            // osd frame may be empty
+            if (!frame_meta->osd_frame.empty()) {
+                cv::imshow(osd_win_title, frame_meta->osd_frame);
+            }
+        }
+    });
+
+    // construct pipeline
+    yunet_face_detector_0->attach_to({file_src_0});
+    osd_0->attach_to({yunet_face_detector_0});
+    app_des_0->attach_to({osd_0});
+
+    // start pipeline
+    file_src_0->start();
+
+    // for debug purpose
+    vp_utils::vp_analysis_board board({file_src_0});
+    board.display();
+}