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MIDI Visualizer

Parsing & visualizing MIDI files in a user-friendly format.

MIDI Visualizer in action

All contained in an HTML web page & minimal JavaScript.

Functionality

MIDI Visualizer processes MIDI files to synthesize the song and create a full visualization of the notes played, using a popular visualization library called d3. I used d3 to construct the piano with lots of lines and rectangles. Similarly, the played notes of the MIDI file are SVG rectangles that overlay on top of the piano with a pink fill.

The music synthesized from the MIDI files comes from a library called MIDIjs, an open-source MIDI synthesizer built for pure JavaScript. As such, everything is portable and contained within a website. You can try out the project here.

As of now, the visualizer only plays a few preset MIDI files, but I am planning to add functionality for users to try uploading their own MIDI file to synthesize. (It's going to take some time, as I need to have server-side interaction on the webpage, which means I need to redesign my existing website to allow for that.) Update 7/08/2020: This feature is now live on my linked website! Try uploading your own MIDI files to see the animation.

If you find bugs with the upload or anything else, please let me know in the Issues section.

How to use

Give the browser some time to download the necessary assets for MIDI synthesis. On a good connection, it shouldn't take longer than ~2 seconds. Once it is ready to play the animation, the button will turn from red to green, which means you can click it to play the animation. Enjoy!

Changelog

  • July 11th, 2020
    • Revamped & diversified the colors for each MIDI track.
    • Decorated the file upload button.
  • July 8th, 2020
    • User upload feature allows for any MIDI file to be parsed, animated, and played
  • April 20th, 2020
    • Added new song, "아무것도 두려워말라 (Don't Be Afraid)"
  • April 2nd, 2020
    • README file updated
    • Originally uploaded the "finalized" project around late March, as seen in commit history

Known bugs

  • Sometimes, clicking the button the split second it is ready may cause the visual animation to start without the music.
  • On a similar note (ha) to this, sometimes the music will play even though nothing was clicked.
  • Currently, changing tempos aren't supported. The animation will play in the original tempo throughout the duration of the song.