midi

EDO# midi

A collection of functions to import and manipulate a midi file

Methods

# (static) chordify(parsed_midi, ticksopt, uniqueopt, as_PCopt, orderedopt) → {Array.<Array.<Number>>}

Gets a midi file and chunks all notes to partitions of a certain timeframe

Remark: "pitch classes" conform to the current tuning system used. E.g., 0-11 in 12EDO, 0-16 in 17EDO, etc.

Parameters:
Name Type Attributes Default Description
parsed_midi JSON

The returned JSON from EDO.midi.import()
ticks Number <optional>
 480

The number of ticks for each partition (the "harmonic rhythm")
unique Boolean <optional>
 true

When true, even if a note is repeated within a given timeframe it will appear once.
as_PC Boolean <optional>
 false

When true, instead of returning the midi note number, the pitches will be returned as pitch classes
ordered Boolean <optional>
 false

When true, each chord will be sorted by pitch height (rather than the order in which it appeared in the midi file)
Source:
See:
Returns:

The midi file returns as array of chords corresponding the to the given timeframe

Type
Array.<Array.<Number>>
Example 
let edo = new EDO(12) // define a tuning system
let bach = edo.midi.import('midi/Bach - Prelude1.mid') //parsing Bach prelude in C major midi file
bach = edo.midi.chordify(bach,960,true,false,true) //chordifying
edo.convert.midi_to_name(bach) //replacing the midi values with note names
//returns
[
 [ 'C4', 'E4', 'G4', 'C5', 'E5' ],
 [ 'C4', 'D4', 'A4', 'D5', 'F5' ],
 [ 'B3', 'D4', 'G4', 'D5', 'F5' ],
 [ 'C4', 'E4', 'G4', 'C5', 'E5' ],
 [ 'C4', 'E4', 'A4', 'E5', 'A5' ],
 [ 'C4', 'D4', 'F#4', 'A4', 'D5' ],
 [ 'B3', 'D4', 'G4', 'D5', 'G5' ],
 [ 'B3', 'C4', 'E4', 'G4', 'C5' ],
 [ 'A3', 'C4', 'E4', 'G4', 'C5' ],
 [ 'D3', 'A3', 'D4', 'F#4', 'C5' ],
 [ 'G3', 'B3', 'D4', 'G4', 'B4' ],
 [ 'G3', 'Bb3', 'E4', 'G4', 'C#5' ],
 [ 'F3', 'A3', 'D4', 'A4', 'D5' ],
 [ 'F3', 'Ab3', 'D4', 'F4', 'B4' ],
 [ 'E3', 'G3', 'C4', 'G4', 'C5' ],
 [ 'E3', 'F3', 'A3', 'C4', 'F4' ],
 [ 'D3', 'F3', 'A3', 'C4', 'F4' ],
 [ 'G2', 'D3', 'G3', 'B3', 'F4' ],
 [ 'C3', 'E3', 'G3', 'C4', 'E4' ],
 [ 'C3', 'G3', 'Bb3', 'C4', 'E4' ],
 [ 'F2', 'F3', 'A3', 'C4', 'E4' ],
 [ 'F#2', 'C3', 'A3', 'C4', 'Eb4' ],
 [ 'Ab2', 'F3', 'B3', 'C4', 'D4' ],
 [ 'G2', 'F3', 'G3', 'B3', 'D4' ],
 [ 'G2', 'E3', 'G3', 'C4', 'E4' ],
 [ 'G2', 'D3', 'G3', 'C4', 'F4' ],
 [ 'G2', 'D3', 'G3', 'B3', 'F4' ],
 [ 'G2', 'Eb3', 'A3', 'C4', 'F#4' ],
 [ 'G2', 'E3', 'G3', 'C4', 'G4' ],
 [ 'G2', 'D3', 'G3', 'C4', 'F4' ],
 [ 'G2', 'D3', 'G3', 'B3', 'F4' ],
 [ 'C2', 'C3', 'G3', 'Bb3', 'E4' ],
 ['C2', 'C3', 'D3', 'F3', 'A3', 'C4', 'F4'],
 ['C2', 'B2', 'D4', 'E4', 'F4', 'G4', 'B4', 'D5', 'F5'],
 [ 'C2', 'C3', 'E4', 'G4', 'C5' ]
]

# (static) import(file_path) → {JSON}

Imports a midi file

Parameters:
Name Type Description
file_path String

The path of the file
Source:
Returns:

the midi file as JSON

Type
JSON

# (static) strip(parsed_midi) → {Array.<(Number|Array.<Number>)>}

Gets a midi file and returns only the note on events from all tracks in correct order as one big array

Parameters:
Name Type Description
parsed_midi JSON

The returned JSON from EDO.midi.import()
Source:
See:
Returns:

Returns an array of pitches (or arrays of pitches if there's more than one note played simultaneously)

Type
Array.<(Number|Array.<Number>)>
Example 
let edo = new EDO(12) // define a tuning system
let bach = edo.midi.import('midi/Bach - Prelude1.mid') //parsing Bach prelude in C major midi file which has multiple tracks
edo.midi.strip(bach) //returns all tracks as one array of pitches
[
    60, 64, 67, 72, 76, 67, 72, 76, 60, 64, 67, 72,
    76, 67, 72, 76, 60, 62, 69, 74, 77, 69, 74, 77,
    60, 62, 69, 74, 77, 69, 74, 77, 59, 62, 67, 74,
    77, 67, 74, 77, 59, 62, 67, 74, 77, 67, 74, 77,
    60, 64, 67, 72, 76, 67, 72, 76, 60, 64, 67, 72,
    76, 67, 72, 76, 60, 64, 69, 76, 81, 69, 76, 81,
    60, 64, 69, 76, 81, 69, 76, 81, 60, 62, 66, 69,
    74, 66, 69, 74, 60, 62, 66, 69, 74, 66, 69, 74,
    59, 62, 67, 74,
    ... 441 more items
]