This library is a fork of the UDP Live Image Streaming library by chenxiaoqino. The main() functions in Server.cpp and Client.cpp were combined into one library called Library.cpp, and a JNI wrapper is wrapped around it for use in Java code. This fork is mainly prepared for Abington Friends School's Roobotics Robotics Team's entry into the 2017 FIRST Robotics Competition.
This project is inspired by https://www.cs.utexas.edu/~teammco/misc/udp_video/ , where images are grabbed from camera on one machine and transfered to another machine via UDP, resulting in negligible latency.
Parameters such as stream size or quality can be adjusted in config.h before re-compile the program.
The code grabs video stream from OpenCV's default input video device. To change input source, simply change the argument passed to cv::VideoCapture() accordingly.
To avoid latency altogether there is no video codec involved during this process. Every frame is individually encoded to jpeg format by OpenCV to drastically reduce the bandwidth consumption.
If passing raw image is preferred, consider changing jpeg to bmp.
Run the following command to see stream your camera through localhost: (CMake and OpenCV required)
git clone https://github.com/chenxiaoqino/udp-image-streaming.git
cd udp-image-streaming/
cmake . && make
./server 10000 &
./client 127.0.0.1 10000
You should see two windows, one with the original grabbed image (before encoding) and one with received live-stream image (after encoding/decoding).
This project is built upon various open-sourced libraries, like Practical C++ Sockets and OpenCV 3 ; please refer to their original license accordingly (GPL/BSD). Code of this project is puslished under MIT License.