Binary MLG (MLVLG) log files converter

Simple tool for parsing and converting EFI Analytics (TunerStudio, MegaLogViewer) binary log files (.mlg) to a human readable formats like:

• .csv - semicolon (;) separated (Virtual Dyno, spreadsheets, etc.)
• .json - JSON raw data
• .msl - ASCII format (TunerStudio, MegaLogViewer)

Or just can be used as a Node library producing JS plain object.

Caveats

• MLVLG also carries data type called Markers (graphical marks used for indicating specific events). They will be stripped in .csv files.
• minimum Node version: 14.x.

# single file, multiple formats
npx mlg-converter --format=csv,msl,json log1.mlg

# single format, multiple files
npx mlg-converter --format=msl log1.mlg log2.mlg log3.mlg

Using parser as a npm package

npm install --save mlg-converter

const fs = require('fs');
const { Parser } = require('mlg-converter');

const b = fs.readFileSync('./test/data/short.mlg');
const arrayBuffer = b.buffer.slice(b.byteOffset, b.byteOffset + b.byteLength);
const result = new Parser(arrayBuffer)
  .parse((percent) => console.log(percent));

console.dir(result, { maxArrayLength: 1 }); // =>

{
  fileFormat: 'MLVLG',
  formatVersion: 1,
  timestamp: 2020-12-28T12:30:43.000Z,
  info: 'speeduino 202009-dev: Speeduino 2020.09-dev\n' +
    'Capture Date: Mon Dec 28 13:30:43 CET 2020',
  bitFieldNames: "",
  fields: [
    {
      name: 'Time',
      units: 's',
      displayStyle: 'Float',
      scale: 1,
      transform: 0,
      digits: 3
    },
    ... 68 more items
  ],
  records: [
    {
      type: 'field',
      timestamp: 15081,
      Time: 0,
      SecL: 8,
      RPM: 0,
      MAP: 10,
      MAPxRPM: 0,
      TPS: 0,
      AFR: 110,
      Lambda: 0.7482993006706238,
      IAT: 54,
      CLT: 68,
      Engine: 0,
      DFCO: 0,
      Gego: 100,
      Gair: 0,
      Gbattery: 100,
      Gwarm: 0,
      Gbaro: 0,
      Gammae: 0,
      'Accel Enrich': 0,
      'Current VE': 70,
      VE1: 70,
      VE2: 0,
      PW: 0,
      'AFR Target': 0,
      'Lambda Target': 0,
      PW2: 0,
      DutyCycle1: 0,
      DutyCycle2: 0,
      'TPS DOT': 0,
      Advance: 24,
      Dwell: 0,
      'Battery V': 71,
      'rpm/s': 0,
      'Boost PSI': -13.198457717895508,
      'Boost Target': 0,
      'Boost Duty': 0,
      'Boost cut': 0,
      'Hard Launch': 0,
      'Hard Limiter': 0,
      'Idle Control': 1,
      'IAC value': 34,
      'Idle Target RPM': 85,
      'Idle RPM Delta': 850,
      'Baro Pressure': 101,
      'Sync Loss #': 0,
      VSS_RAW: 0,
      Clutch_RAW: 1,
      Aux2: 0,
      Aux3: 0,
      Aux4: 0,
      Aux5: 0,
      Aux6: 0,
      Aux7: 0,
      Aux8: 0,
      Aux9: 0,
      Aux10: 0,
      Aux11: 0,
      Aux12: 0,
      Aux13: 0,
      Aux14: 0,
      Aux15: 0,
      'Advance 1': 24,
      'Advance 2': 0,
      'Trip Meter Miles': 0,
      'Odometer Miles': 11.340239524841309,
      'Vehicle Speed': 0,
      Power: 0,
      Torque: 0,
      Odometer_Miles: 11.340239524841309
    },
    ... 51 more items
  ]
}

Developing

npm install
npm run build
npm test

License