fsphil / ssdv
Licence: GPL-3.0 license
A robust version of the JPEG image format, for transmission over an unreliable medium.
Stars: ✭ 74
SSDV - simple command line app for encoding / decoding SSDV image data Created by Philip Heron <[email protected]> http://www.sanslogic.co.uk/ssdv/ A robust packetised version of the JPEG image format. Uses the Reed-Solomon codec written by Phil Karn, KA9Q. ENCODING $ ssdv -e -c TEST01 -i ID input.jpeg output.bin This encodes the 'input.jpeg' image file into SSDV packets stored in the 'output.bin' file. TEST01 (the callsign, an alphanumeric string up to 6 characters) and ID (a number from 0-255) are encoded into the header of each packet. The ID should be changed for each new image transmitted to allow the decoder to identify when a new image begins. The output file contains a series of SSDV packets, each packet always being 256 bytes in length. Additional data may be transmitted between each packet, the decoder will ignore this. DECODING $ ssdv -d input.bin output.jpeg This decodes a file 'input.bin' containing a series of SSDV packets into the JPEG file 'output.jpeg'. LIMITATIONS Only JPEG files are supported, with the following limitations: - Greyscale or YUV/YCbCr colour formats - Width and height must be a multiple of 16 (up to a resolution of 4080 x 4080) - Baseline DCT only - The total number of MCU blocks must not exceed 65535 INSTALLING make TODO * Allow the decoder to handle multiple images in the input stream. * Experiment with adaptive or multiple huffman tables.
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