sfxr-to-wav

#!/usr/bin/env node

sfxr = require('./sfxr.js');
var fs = require('fs');

// defaults
var outfile = "sfxr-sound.wav";

// set up initial sound parameters object
var parameters = new sfxr.Params();
parameters.sound_vol = 0.25;
parameters.sample_rate = 44100;
parameters.sample_size = 8;

// parse arguments
for (a=2; a<process.argv.length; a++) {
  if (process.argv[a] == "-h" || process.argv[a] == "--help") {
    console.log("Usage: ./sfxr-to-wav SYNTH-DEFINITION [FILENAME.wav]");
    console.log("SYNTH-DEFINITION is the encoded synth as found in the share URL at sfxr.me");
    console.log("You can also pipe the JSON Serialized version of the synth into the script like `cat my-sound.sfxr.json | ./sfxr-to-wav my-sound.wav`");
    process.exit();
  } else if (process.argv[a].indexOf(".wav") != -1) {
    outfile = process.argv[a];
  } else {
    // grab the b58 synth definition from the command line
    parameters.fromB58(process.argv[a]);
    parameters.set = true;
    if (outfile == "sfxr-sound.wav") {
      outfile = process.argv[a] + ".wav";
    }
  }
}

if (!parameters.set) {
  // we're getting json from stdin
  parameters.fromJSON(
    JSON.parse(
      fs.readFileSync('/dev/stdin').toString()));
}

// get jsfxr to generate the sound
var sound = new sfxr.SoundEffect(parameters).generate();

// write the wav out to a file
var regex = /^data:.+\/(.+);base64,(.*)$/;
var matches = sound.dataURI.match(regex);
var ext = matches[1];
var data = matches[2];
var buffer = new Buffer(data, 'base64');
fs.writeFileSync(outfile, buffer);