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