JSMidi is a lightweight JavaScript library that can generate and play Standard MIDI (scm) files on the fly directly from your browser or JavaScript server.
Disclaimer: This is Work In Progress, and it is by no means finished yet.
JSMidi generates a Base64 string that can be saved as a MIDI file or played directly in the browser using HTML5 tag.
This is a very simple example showing how to create a single track with 3 notes. Since timings are not specified the defaults will be taken.
// We pass some notes to |MidiWriter.createNote| to create the MIDI
// events that define the notes that will be in the final MIDI stream. If
// no other parameters are specified to |createNote|, a NoteOff event
// will be inserted automatically, instead of letting the note ring forever.
// Disregard the |push.apply|, it is used here simply to flatten the
// resulting array, since |createNote| returns an array of events.
var noteEvents = [];
["C4", "E4", "G4"].forEach(function(note) {
Array.prototype.push.apply(noteEvents, MidiEvent.createNote(note));
});
// Create a track that contains the events to play the notes above
var track = new MidiTrack({ events: noteEvents });
// Creates an object that contains the final MIDI track in base64 and some
// useful methods.
var song = MidiWriter({ tracks: [track] });
// Alert the base64 representation of the MIDI file
alert(song.b64);
// Play the song
song.play();
// Play/save the song (depending of MIDI plugins in the browser). It opens
// a new window and loads the generated MIDI file with the proper MIME type
song.save();
- MetaEvents won't be processed properly right now (this is important, and will be solved soon).
- MetaEvents shortcuts
- Reading MIDI files (it only writes to them now)
- MIDI Type 0 & 1 differences and validations
- Sergi Mansilla [email protected]
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