program w/o threading

Author: AriNguyen

main2.cpp

@@ -0,0 +1,70 @@
+/**
+ *  @file main.cpp
+ *  @brief opencv webcam stream and testing multithreading efficiency
+ *  @author Ari Nguyen 
+ */
+#include <chrono>
+#include <iostream>
+#include <stdio.h>
+#include <string>
+#include <opencv2/opencv.hpp>
+
+#include "src/utils.h"
+
+int main(int argc, char *argv[]) {
+    int numFrames = 100;  // default
+    int apiID = cv::CAP_ANY; // 0 = autodetect default API
+    int device_id = 0; 
+
+    cv::VideoCapture ws;
+    FPS fps;
+    cv::Mat frame;
+
+    // set numFrames;
+    if (argc > 1) {
+        try {
+            numFrames = atoi(argv[1]);
+        }
+        catch (std::exception const & e) {
+            std::cout<< "error: " << e.what() << std::endl;
+            exit(1);
+        }
+    }
+
+    // start streaming video
+    ws.open(device_id, apiID);
+    if (!ws.isOpened()) {
+        std::cerr << "(!)ERROR: Unable to open camera\n";
+        exit(2);
+    }
+    
+    fps.start();
+    while (fps.getNumFrames() < numFrames) {
+        ws.read(frame);
+        if (frame.empty()) { //check if succeeded
+            std::cerr << "(!)Error2: Blank frame grabbed\n";
+            exit(3);
+        }
+
+        // show live and wait for a key with timeout long enough to show images
+        cv::imshow("Live", frame);
+        if (cv::waitKey(5) >= 0) {
+            break;
+        }
+        fps.update();
+    }
+
+    
+    // stop measuring fps
+    fps.stop();
+
+    // display info
+    std::cout << "[INFO] Total Frames: " << numFrames << std::endl;
+    std::cout << "[INFO] Elasped time: " << fps.elapsed() << " seconds\n";
+    std::cout << "[INFO] Approx. FPS: " << fps.fps() << std::endl;
+
+    // cleanup
+    cv::destroyAllWindows();
+
+    exit(0);
+}