Send cv::Mat with FIFO

code/C++/FIFO_w_OpenCV/writer.cpp

@@ -0,0 +1,59 @@
+#include <random>
+#include <vector>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <opencv2/opencv.hpp>
+
+#define FIFO_NAME "cvMat"
+
+// const std::vector<std::string> imageFiles = {"bus.jpg", "cat_dog.jpg", "girl_faces.png"};
+const std::vector<std::string> imageFiles = {"bus.jpg"};
+
+cv::Mat getFrame(const std::string source);
+std::string getRandomImage(std::vector<std::string> images);
+
+int main(int argc, char const *argv[]) {
+  if (!mkfifo(FIFO_NAME, 0666)) {
+    std::perror("open");
+    return EXIT_FAILURE;
+  }
+
+  cv::Mat frame = getFrame(getRandomImage(imageFiles));
+  cv::Mat flat = frame.reshape(1, frame.total() * frame.channels());
+  std::vector<uchar> buffer = frame.isContinuous() ? flat : flat.clone();
+
+  int fd = open(FIFO_NAME, O_WRONLY);
+  write(fd, buffer.data(), buffer.size());
+  printf("Sended: %d\n", buffer.size());
+  close(fd);
+
+  cv::Mat my_mat = cv::Mat(frame.rows, frame.cols, frame.type(), buffer.data());
+  cv::imwrite("sended.png", my_mat);
+
+  return EXIT_SUCCESS;
+}
+
+cv::Mat getFrame(const std::string source) {
+  cv::Mat image = cv::imread(source, cv::IMREAD_COLOR);
+
+  if (image.empty()) {
+    std::perror("failed to load image");
+    const cv::Mat emptyFrame(480, 640, CV_8UC3, cv::Scalar(44, 44, 44));
+    return emptyFrame;
+  } else {
+    return image;
+  }
+}
+
+std::string getRandomImage(std::vector<std::string> images) {
+  std::random_device rd;
+  std::mt19937 gen(rd());
+  std::uniform_int_distribution<> dis(0, images.size() - 1);
+  int randomIndex = dis(gen);
+  std::string randomString = images[randomIndex];
+
+  return randomString;
+}