spessasynth_lib/midi_parser/README.md

This is the MIDI file parsing folder.

The code here is responsible for parsing the MIDI files and interpreting the messsages. All the events are defined in the midi_message.js file.

MIDI Classes hierarchy

MIDI Sequence

• The most basic class, containing all the metadata that inheritors have.
• It does not contain track data or embedded sound bank.
• Contains the function for calculating time from ticks.
• Contains the copying code.

MIDI Data

• Inherits from MIDI Sequence.
• Has an isEmbedded property to mark the existence of embedded bank. This is the class that is available in sequencer.midiData.

Basic MIDI

• Inherits from MIDI Sequence.
• The actual MIDI representation, containing the track data and embedded sound banks.
• Contains the code for parsing the MIDI and filling in the metadata automatically.
• Contains the SMF/RMI writing functions.
• Contains the code for determining used channels on tracks.

MIDI Builder

• Inherits from Basic MIDI.
• Used for building MIDIs from scratch.

MIDI

• Inherits from Basic MIDI.
• The SMF/RMI/XMF file parser.
• Called by the sequencer if an ArrayBuffer is provided.