Camera/main.cpp

Demonstrates:

• Initializing camera subsystem
• Capturing frames using libcamera + lccv
• Basic image/video handling

 
#include <spdlog/spdlog.h>
#include "lccv.hpp"
 
#include <opencv2/imgcodecs.hpp>
 
int main()
{
 
    // First find active camera id  
    spdlog::info("Initializing camera");
 
    PiCamera cam;
    cam.options->photo_width = 3280;
    cam.options->photo_height = 2464;
    cam.options->video_width = 1280;
    cam.options->video_height = 960;
    cam.options->framerate = 15;
    cam.options->verbose = true;
 
    // Single frame capture example
    if (cam.startPhoto())
    {
        cv::Mat frame_rgb;
        if (!cam.capturePhoto(frame_rgb))
        {
            spdlog::error("Camera read buffer failed at capture!");
            return -3;
        }
 
        cv::imwrite("capture.jpg", frame_rgb);
        spdlog::info("Frame saved!");
        cam.stopPhoto();
    }
 
    // Video frame capture example
    // 
    // This example uses an OpenCV imshow() window to display captured frames. (X11 forwarding over SSH)
    // However, you have several options to view the camera output.
    // Here are a few examples:
    // 1) Stream frames over the network (probably fast and best option, requires addditional coding)
    //      inside your capture loop:
    //      std::vector<uchar> jpeg;
    //      cv::imencode(".jpg", frame, jpeg); (optional: reduce JPEG quality for small data)
    //      -> send jpeg over socket / HTTP
    // 2) X11 forwarding over SSH (simple, but slow)
    // 
    // Note:
    // - The image window may NOT be displayed when running with root privileges
    //   (this can cause GTK/X11 permission errors).
    // - X11 forwarding is required to display the window over SSH.
    // - Make sure your SSH client supports X11 forwarding.
    //
    // To test whether X11 forwarding is working correctly:
    //   sudo apt install -y x11-apps
    //   xclock
    // If X11 is working, a clock window should appear.
    //
    // Also verify that DISPLAY is set:
    //   echo $DISPLAY
    // It should show something like "localhost:11.0"
    if (cam.startVideo())
    {
        spdlog::info("Video window is live! Press ESC to quit!");
 
        // make window size auto size
        cv::namedWindow("Camera", cv::WINDOW_NORMAL);
        cv::resizeWindow("Camera", 640, 480);
 
        int time_out_ms = 1500;
        int total_frame = 300;
 
        cv::Mat frame;
        cv::Mat frame_640x480;      
        while (total_frame-- > 0)
        {
            if (cam.getVideoFrame(frame, time_out_ms))
            {
                // resize frame for fast X11
                cv::resize(frame, frame_640x480, cv::Size(640, 480));
                cv::imshow("Camera", frame);
 
                int k = cv::waitKey(1);
                if (k == 27) break; // ESC
            }
            else
                spdlog::warn("getVideoFrame() timeout/fail");
        }
 
        cam.stopVideo();
    }
 
    return 0;
}