node-sstv

(Another) SSTV image encoder for NodeJS. Inspired by echicken/node-sstv.

This library attempts to implement the encoding process of SSTV modes by following the Proposal for SSTV Mode Specifications paper by JL Barber, and echicken/node-sstv's repository as reference for the PCM generation and scanline sampling.

API

Refer to the generated documentation.

Examples

• Creates a SSTV stream using mode Pakoson 7 into a file.

  const { SSTVStream, Mode, PCMFormat } = require('node-sstv')
  const fs = require('node:fs')
  
  new SSTVStream(Mode.PASOKON_7, 'cute_tako.png', {
      pcmFormat: PCMFormat.SIGNED_16_LE,
      sampleRate: 44100
  }).pipe(fs.createWriteStream('sstv_tako.pcm'))

• Creates a SSTV stream and plays it out of the speakers (using ffplay)

  const { SSTVStream, Mode, PCMFormat } = require('node-sstv')
  const { spawn } = require('node:child_process')
  
  const ffplay = spawn('ffplay', [
      '-f', 's16le',
      '-ar', '44100',
      '-ac', '1',
      '-autoexit',
      '-'
  ])
  
  new SSTVStream(Mode.PASOKON_7, 'cute_tako.png', {
      pcmFormat: PCMFormat.SIGNED_16_LE,
      sampleRate: 44100
  }).pipe(ffplay.stdin)

Supported modes

|Mode|Alias| |-|-| |Scottie 1|Mode.SCOTTIE_1| |Scottie 2|Mode.SCOTTIE_2| |Scottie DX|Mode.SCOTTIE_DX| |Martin 1|Mode.MARTIN_1| |Martin 2|Mode.MARTIN_2| |Robot Color 36|Mode.ROBOT_36| |Robot Color 72|Mode.ROBOT_72| |Wrasse SC2-180|Mode.SC2_180| |Pasokon 3|Mode.PASOKON_3| |Pasokon 5|Mode.PASOKON_5| |Pasokon 7|Mode.PASOKON_7| |PD50|Mode.PD50| |PD90|Mode.PD90| |PD120|Mode.PD120| |PD160|Mode.PD160| |PD180|Mode.PD180| |PD240|Mode.PD240| |PD290|Mode.PD290| |FAX480|Mode.FAX480|

License

MIT