udp_streamer

A library for transmitting video over UDP with minimal delays. The OpenCV library is used to capture and encode images. This project is inspired by udp-image-streaming.

Demo

The "demo" folder contains examples of receiver and transmitter code. Build and run the demo:

mkdir build
cd build
cmake -DDemo:=ON ..
cmake --build .
cd Demo
# First terminal
.\udp_transmitter
# second terminal
.\udp_receiver

Examples

// udp_transmitter
#include "opencv2/opencv.hpp"
#include "udp_streamer/udp_streamer.hpp"
#include <iostream>

int main()
{
    udp_streamer::Transmitter transmitter;
    transmitter.set_socket("127.0.0.1", 8000);
    transmitter.set_pack_size(4096);
    transmitter.set_interval(50);
    transmitter.set_encode_quality(70);

    cv::VideoCapture cap(0);
    if (!cap.isOpened())
    {
        std::cerr << "Err: Failed to open camera" << std::endl;
        exit(1);
    }
    cv::namedWindow("Transmitter", cv::WINDOW_AUTOSIZE);
    cv::Mat original_img;

    while (true)
    {
        if (!cap.read(original_img))
        {
            std::cerr << "Err: Read camera error" << std::endl;
            break;
        }

        if (original_img.empty())
        {
            std::cerr << "Err: No data" << std::endl;
            break;
        }

        cv::imshow("Transmitter", original_img);

        transmitter.send_img(original_img);

        if (cv::waitKey(1) == (int)'q')
        {
            break;
        }
    }

    return 0;
}

// udp_receiver
#include "opencv2/opencv.hpp"
#include "udp_streamer/udp_streamer.hpp"
#include <iostream>

int main()
{
    udp_streamer::Receiver receiver;
    receiver.set_socket("", 8000);
    receiver.socket_bind();

    cv::namedWindow("Receiver", cv::WINDOW_AUTOSIZE);

    cv::Mat output_img;

    while (true)
    {
        receiver.receive_img(output_img);

        if (!output_img.empty())
        {
            cv::imshow("Receiver", output_img);
        }

        if (cv::waitKey(1) == (int)'q')
        {
            break;
        }
    }

    return 0;
}