djs

djs.js

var waveform = require('waveform');
var fs = require('fs');
var probe = require('node-ffprobe');
var _ = require('lodash');
var async = require('async');

var walk    = require('walk');
var files   = [];

// Walker options
var walker  = walk.walk('/home/www/dj/www/mp3', { followLinks: false });

walker.on('file', function(root, stat, next) {
  // Add this file to the list of files
  if(stat.name.match(/\.mp3$/)) files.push(root + '/' + stat.name);
  next();
});

walker.on('end', function() {
  console.log(files);
  async.each(files, function(track, callback) {
    probe(track, function(err, probeData) {
      fs.writeFile(track + ".probe.json", JSON.stringify(probeData));
    });

	console.log('done probe ' + track);

    waveform(track, {
      // options
      'scan': false,                  // whether to do a pass to detect duration

      // waveform.js options
      waveformjs: track + ".wave.json",  // path to output-file or - for stdout
      'wjs-width': 800,               // width in samples
      'wjs-precision': 4,             // how many digits of precision
      'wjs-plain': false             // exclude metadata in output JSON (default off)
    }, function(err, stdout) {
	console.log('done wave ' + track);
      callback();
    });
  });
});

// and fixed node_modules/waveform/index.js
var path = require('path');
var execFileSync = require('child_process').execFileSync;
var waveformBin = path.resolve(__dirname, "build", "Release", "waveform");

var flagNames = {
  'scan': true,
  'wjs-plain': true,
};

module.exports = function(audiofile, options, callback) {
  var cmdline = [audiofile];
  for (var optName in options) {
    if (flagNames[optName]) {
      cmdline.push('--' + optName);
    } else {
      var value = options[optName];
      cmdline.push('--' + optName);
      cmdline.push(value);
    }
  }

  callback(null, execFileSync(waveformBin, cmdline));
};