Math Sequence to MIDI
Project description
rmidipy
This python library is intended to open midi files as python objects. Midi file is binary files, list in form of tracks. Every track contains sequence of events. Each event is assosiated delta time, which refers to time from perivous event, current event should occur.
In same structure rmidi has MIDI as base class, MIDI.Track for track representation and MIDI.Track.Event to represent each event.
Getting Started
rmidi is available on python pip. You can install library through below command.
$ pip install rmidi
MIDI
>>> from rmidi import MIDI
>>> y = MIDI.parse_midi(<midi_file_path>)
OUTPUT
| Absolute Time | Duration | Delta Time | ETYPE | Event ID | META | LENGTH | DATA
|______________________________________________________________________________________________________________________________ . . .
| 0.000000 | 0.000000 | 0x0 | META | 0xff | 0x58 | 0x4 | 0x04 0x02 0x18 0x08
| 0.000000 | 0.000000 | 0x0 | META | 0xff | 0x59 | 0x2 | 0x00 0x00
| 0.000000 | 0.000000 | 0x0 | META | 0xff | 0x51 | 0x3 | 0x07 0xa1 0x20
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x79 0x00
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0xc0 | 0 | 0x1 | 0x00
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x07 0x64
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x0a 0x40
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x5b 0x00
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x5d 0x00
| 0.000000 | 0.000000 | 0x0 | META | 0xff | 0x21 | 0x1 | 0x00
| 0.000000 | 0.000000 | 0x0 | CHANNEL | 0x90 | 0 | 0x2 | 0x48 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x48 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4a 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x4a 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4c 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x4c 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4d 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x4d 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4f 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x4f 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x51 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x51 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x53 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x53 0x00
| 0.000000 | 0.000000 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x54 0x50
| 0.000000 | 0.000000 | 0x71f | CHANNEL | 0x90 | 0 | 0x2 | 0x54 0x00
| 0.000000 | 0.000000 | 0x1 | META | 0xff | 0x2f | 0x0 |
Absolute midi
Absolute Midi is defined as its time from start, in seconds.
>>> from rmidi import MIDI, AbosluteMidi
>>> y = MIDI.parse_midi(<midi-file-path>)
>>> yabs = AbsoluteMidi.to_abs_midi(y)
>>> print(yabs)
OUTPUT
| Absolute Time | Duration | Note Time | Delta Time | ETYPE | Event ID | META | LENGTH | DATA
|______________________________________________________________________________________________________________________________ . . .
| 0.000000 | 0.000000 | 0 | 0x0 | META | 0xff | 0x58 | 0x4 | 0x04 0x02 0x18 0x08
| 0.000000 | 0.000000 | 0 | 0x0 | META | 0xff | 0x59 | 0x2 | 0x00 0x00
| 0.000000 | 0.000000 | 0 | 0x0 | META | 0xff | 0x51 | 0x3 | 0x07 0xa1 0x20
| 0.000000 | 0.000000 | 0 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x79 0x00
| 0.000000 | 0.000000 | 0 | 0x0 | CHANNEL | 0xc0 | 0 | 0x1 | 0x00
| 0.000000 | 0.000000 | 0 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x07 0x64
| 0.000000 | 0.000000 | 0 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x0a 0x40
| 0.000000 | 0.000000 | 0 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x5b 0x00
| 0.000000 | 0.000000 | 0 | 0x0 | CHANNEL | 0xb0 | 0 | 0x2 | 0x5d 0x00
| 0.000000 | 0.000000 | 0 | 0x0 | META | 0xff | 0x21 | 0x1 | 0x00
| 0.000000 | 31.649306 | 1.0666666666666667 | 0x0 | CHANNEL | 0x90 | 0 | 0x2 | 0x48 0x50
| 33.333333 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4a 0x50
| 66.666667 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4c 0x50
| 100.000000 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4d 0x50
| 133.333333 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x4f 0x50
| 166.666667 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x51 0x50
| 200.000000 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x53 0x50
| 233.333333 | 31.649306 | 1.0666666666666667 | 0x61 | CHANNEL | 0x90 | 0 | 0x2 | 0x54 0x50
| 0.000000 | 0.000000 | 0 | 0x1 | META | 0xff | 0x2f | 0x0 |
*******************************************************************************************************************
NoteSequence
rmidi.dataset.NoteSequence is simliar object to that of Magenta.NoteSequence, It holds everthing in dict, whole midi file is express as python nested dictionary
>>> from rmidi.dataset import notesequence
>>> ns = NoteSequence(<midi-file-path>)
>>> print(ns)
Output
[
{
"track-0": [
[
"type : meta",
"deltatime : 0",
"time : 0",
"duration : 0",
"subtype : time_sig",
"length : 4",
"data : 0x04 0x02 0x18 0x08 \n"
],
[
"type : meta",
"deltatime : 0",
"time : 0",
"duration : 0",
"subtype : key_sig",
"length : 2",
"data : 0x00 0x00 \n"
],
[
"type : meta",
"deltatime : 0",
"time : 0",
"duration : 0",
"subtype : set_tempo",
"length : 3",
"data : 0x07 0xa1 0x20 \n"
],
[
"type : cntroller",
"deltatime : 0",
"event_id : 176",
"time : 0",
"duaration : 0",
"pitch : None",
"velocity : None",
"is_drum : False",
"subtype : mode_messages_0"
],
[
"type : program_change",
"deltatime : 0",
"event_id : 192",
"time : 0",
"duaration : 0",
"pitch : None",
"velocity : None",
"is_drum : False"
],
[
"type : cntroller",
"deltatime : 0",
"event_id : 176",
"time : 0",
"duaration : 0",
"pitch : None",
"velocity : None",
"is_drum : False",
"subtype : main_volume"
],
[
"type : cntroller",
"deltatime : 0",
"event_id : 176",
"time : 0",
"duaration : 0",
"pitch : None",
"velocity : None",
"is_drum : False",
"subtype : pan"
],
[
"type : cntroller",
"deltatime : 0",
"event_id : 176",
"time : 0",
"duaration : 0",
"pitch : None",
"velocity : None",
"is_drum : False",
"subtype : effects_depth_0"
],
[
"type : cntroller",
"deltatime : 0",
"event_id : 176",
"time : 0",
"duaration : 0",
"pitch : None",
"velocity : None",
"is_drum : False",
"subtype : effects_depth_2"
],
[
"type : meta",
"deltatime : 0",
"time : 0",
"duration : 0",
"subtype : midi_port",
"length : 1",
"data : 0x00 \n"
],
[
"type : note_on",
"deltatime : 0",
"event_id : 144",
"time : 0.0",
"duaration : 31.649305555555554",
"pitch : 72",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 33.33333333333333",
"duaration : 31.649305555555557",
"pitch : 74",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 66.66666666666666",
"duaration : 31.649305555555557",
"pitch : 76",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 99.99999999999999",
"duaration : 31.649305555555557",
"pitch : 77",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 133.33333333333331",
"duaration : 31.649305555555543",
"pitch : 79",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 166.66666666666663",
"duaration : 31.649305555555543",
"pitch : 81",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 199.99999999999994",
"duaration : 31.649305555555543",
"pitch : 83",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 233.33333333333326",
"duaration : 31.649305555555543",
"pitch : 84",
"velocity : 80",
"is_drum : False"
],
[
"type : meta",
"deltatime : 1",
"time : 0",
"duration : 0",
"subtype : end_of_track",
"length : 0",
"data : \n"
]
]
}
]
NoteSequence@tostring
Converts the dict to pretty string
from rmidi.dataset import NoteSequence
dict_ = {0: OrderedDict([(17, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 233.33333333333326, 'duaration': 31.649305555555543, 'pitch': 84, 'velocity': 80, 'is_drum': False}), (16, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 199.99999999999994, 'duaration': 31.649305555555543, 'pitch': 83, 'velocity': 80, 'is_drum': False}), (15, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 166.66666666666663, 'duaration': 31.649305555555543, 'pitch': 81, 'velocity': 80, 'is_drum': False}), (14, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 133.33333333333331, 'duaration': 31.649305555555543, 'pitch': 79, 'velocity': 80, 'is_drum': False}), (13, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 99.99999999999999, 'duaration': 31.649305555555557, 'pitch': 77, 'velocity': 80, 'is_drum': False}), (12, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 66.66666666666666, 'duaration': 31.649305555555557, 'pitch': 76, 'velocity': 80, 'is_drum': False}), (11, {'type': 'note_on', 'deltatime': 97, 'event_id': 144, 'time': 33.33333333333333, 'duaration': 31.649305555555557, 'pitch': 74, 'velocity': 80, 'is_drum': False}), (10, {'type': 'note_on', 'deltatime': 0, 'event_id': 144, 'time': 0.0, 'duaration': 31.649305555555554, 'pitch': 72, 'velocity': 80, 'is_drum': False})])}
print(NoteSequence.tostring(dict_))
Output
[
{
"track-0": [
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 233.33333333333326",
"duaration : 31.649305555555543",
"pitch : 84",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 199.99999999999994",
"duaration : 31.649305555555543",
"pitch : 83",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 166.66666666666663",
"duaration : 31.649305555555543",
"pitch : 81",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 133.33333333333331",
"duaration : 31.649305555555543",
"pitch : 79",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 99.99999999999999",
"duaration : 31.649305555555557",
"pitch : 77",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 66.66666666666666",
"duaration : 31.649305555555557",
"pitch : 76",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 33.33333333333333",
"duaration : 31.649305555555557",
"pitch : 74",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 0",
"event_id : 144",
"time : 0.0",
"duaration : 31.649305555555554",
"pitch : 72",
"velocity : 80",
"is_drum : False"
]
]
}
]
NoteSequence@notes
To get just notes, i.e. just note_on and note_off event, you can call NoteSequence object as ns.notes
>>> from rmidi.dataset import NoteSequence
>>> ns = NoteSequence(<midi-file-path>)
>>> notes = ns.notes
>>> print(notes)
>>> print(ns.tostring(notes)) # to pretty print
Output
[
{
"track-0": [
[
"type : note_on",
"deltatime : 0",
"event_id : 144",
"time : 0.0",
"duaration : 31.649305555555554",
"pitch : 72",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 33.33333333333333",
"duaration : 31.649305555555557",
"pitch : 74",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 66.66666666666666",
"duaration : 31.649305555555557",
"pitch : 76",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 99.99999999999999",
"duaration : 31.649305555555557",
"pitch : 77",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 133.33333333333331",
"duaration : 31.649305555555543",
"pitch : 79",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 166.66666666666663",
"duaration : 31.649305555555543",
"pitch : 81",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 199.99999999999994",
"duaration : 31.649305555555543",
"pitch : 83",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 233.33333333333326",
"duaration : 31.649305555555543",
"pitch : 84",
"velocity : 80",
"is_drum : False"
]
]
}
]
Notesequence@order_by
It orders the events within track base on event attribute, order by is intended to work for attributes 'time', 'duration', 'pitch', deltatime
>>> from rmidi.dataset import NoteSequence
>>> ns = NoteSequence(filepath)
>>> ordered = ns.order_by(<attribute_name>, reverse=True)
>>> print(ordered) # Output for pitch sorted in reverse
Output
$
[
{
"track-0": [
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 233.33333333333326",
"duaration : 31.649305555555543",
"pitch : 84",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 199.99999999999994",
"duaration : 31.649305555555543",
"pitch : 83",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 166.66666666666663",
"duaration : 31.649305555555543",
"pitch : 81",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 133.33333333333331",
"duaration : 31.649305555555543",
"pitch : 79",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 99.99999999999999",
"duaration : 31.649305555555557",
"pitch : 77",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 66.66666666666666",
"duaration : 31.649305555555557",
"pitch : 76",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 97",
"event_id : 144",
"time : 33.33333333333333",
"duaration : 31.649305555555557",
"pitch : 74",
"velocity : 80",
"is_drum : False"
],
[
"type : note_on",
"deltatime : 0",
"event_id : 144",
"time : 0.0",
"duaration : 31.649305555555554",
"pitch : 72",
"velocity : 80",
"is_drum : False"
]
]
}
]
Notesequence@to_abs_midi
Convert NoteSequece to AbsoluteMidi object.
>>> from rmidi.dataset import NoteSequence
>>> ns = NoteSequence(filepath)
>>> absmidi = ns.to_abs_midi()
>>> print(type(absmidi))
Output
<class 'rmidi.absolutemidi.AbsoluteMidi'>
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