Imgsrv

imgsrv - Simple and fast HTTP server to provide still images and metadata acquired by the camera

Overview

This server was developed to increase the transfer rate of individual images acquired by the Elphel 353 series cameras as the CGI (and even fastCGI applications) connected through the universal web servers (Boa, included with Axis SDK, currently on the default port 80 in camera and lighttpd - now used in Elphel cameras together with php in fast CGI mode, port 81) failed to reach the top speed of the 100mbps network. Specialized imgsrv is connected through a different port (currently listens to 8081) and writes GET responses directly to the socket (reading image data from the [circbuf] using zero-copy memory mapping mmap), reaching 9-10MB/sec - virtually the full bandwidth of the network. This server does not provide any control over the sensor or FPGA compressor operation, it's only purpose is to get data acquired to the (currently 19 MB) circular buffer in the system RAM.