def parse_nottingham_to_sequence(input_filename, time_step, verbose=False):
"""
input_filename: a MIDI filename
returns a [T x D] matrix representing a sequence with T time steps over
D dimensions
"""
sequence = []
pattern = midi.read_midifile(input_filename)
metadata = {
"path": input_filename,
"name": input_filename.split("/")[-1].split(".")[0]
}
# Most nottingham midi's have 3 tracks. metadata info, melody, harmony
# throw away any tracks that don't fit this
if len(pattern) != 3:
if verbose:
"Skipping track with {} tracks".format(len(pattern))
return (metadata, None)
# ticks_per_quarter = -1
for msg in pattern[0]:
if isinstance(msg, midi.TimeSignatureEvent):
metadata["ticks_per_quarter"] = msg.get_metronome()
ticks_per_quarter = msg.get_metronome()
if verbose:
print("{}".format(input_filename))
print("Track resolution: {}".format(pattern.resolution))
print("Number of tracks: {}".format(len(pattern)))
print("Time step: {}".format(time_step))
print("Ticks per quarter: {}".format(ticks_per_quarter))
# Track ingestion stage
track_ticks = 0
melody_notes, melody_ticks = midi_util.ingest_notes(pattern[1])
harmony_notes, harmony_ticks = midi_util.ingest_notes(pattern[2])
track_ticks = midi_util.round_tick(max(melody_ticks, harmony_ticks),
time_step)
if verbose:
print("Track ticks (rounded): {} ({} time steps)".format(
track_ticks, track_ticks / time_step))
melody_sequence = midi_util.round_notes(melody_notes,
track_ticks,
time_step,
R=NOTTINGHAM_MELODY_RANGE,
O=NOTTINGHAM_MELODY_MIN)
for i in range(melody_sequence.shape[0]):
if np.count_nonzero(melody_sequence[i, :]) > 1:
if verbose:
print("Double note found: {}: {} ({})".format(
i, np.nonzero(melody_sequence[i, :]), input_filename))
return (metadata, None)
harmony_sequence = midi_util.round_notes(harmony_notes, track_ticks,
time_step)
harmonies = []
for i in range(harmony_sequence.shape[0]):
notes = np.where(harmony_sequence[i] == 1)[0]
if len(notes) > 0:
notes_shift = [
mingus.core.notes.int_to_note(h % 12) for h in notes
]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
# try flat combinations
notes_shift = [
SHARPS_TO_FLATS[n] if n in SHARPS_TO_FLATS else n
for n in notes_shift
]
chord = mingus.core.chords.determine(notes_shift,
shorthand=True)
if len(chord) == 0:
if verbose:
print("Could not determine chord: {} ({}, {}), defaulting to last steps chord" \
.format(notes_shift, input_filename, i))
if len(harmonies) > 0:
harmonies.append(harmonies[-1])
else:
harmonies.append(NO_CHORD)
else:
resolved = resolve_chord(chord[0])
if resolved:
harmonies.append(resolved)
else:
harmonies.append(NO_CHORD)
else:
harmonies.append(NO_CHORD)
return (metadata, (melody_sequence, harmonies))
harmony_notes, harmony_ticks = midi_util.ingest_notes(pattern[2])
track_ticks = midi_util.round_tick(max(melody_ticks, harmony_ticks), time_step)
if verbose:
print ("Track ticks (rounded): {} ({} time steps)".format(track_ticks, track_ticks/time_step))
melody_sequence = midi_util.round_notes(melody_notes, track_ticks, time_step,
R=NOTTINGHAM_MELODY_RANGE, O=NOTTINGHAM_MELODY_MIN)
for i in range(melody_sequence.shape[0]):
if np.count_nonzero(melody_sequence[i, :]) > 1:
if verbose:
print ("Double note found: {}: {} ({})".format(i, np.nonzero(melody_sequence[i, :]), input_filename))
return (metadata, None)
harmony_sequence = midi_util.round_notes(harmony_notes, track_ticks, time_step)
harmonies = []
for i in range(harmony_sequence.shape[0]):
notes = np.where(harmony_sequence[i] == 1)[0]
if len(notes) > 0:
notes_shift = [ mingus.core.notes.int_to_note(h%12) for h in notes]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
# try flat combinations
notes_shift = [ SHARPS_TO_FLATS[n] if n in SHARPS_TO_FLATS else n for n in notes_shift]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
if verbose:
print ("Could not determine chord: {} ({}, {}), defaulting to last steps chord" \
.format(notes_shift, input_filename, i))
def Data_to_Sequence(midFile, timeStep):
unkChord = 'NONE' # for unknown chords
harmony = []
# get MIDI evet messages from each file
midData = midi.read_midifile(midFile)
# store file path and name as meta info
meta = {"path": midFile, "name": midFile.split("/")[-1].split(".")[0]}
# check for length , 3 tracks for meta , melody and harmony
if len(midData) != 3:
return (meta, None)
for msg in midData[0]:
if isinstance(msg, midi.TimeSignatureEvent):
# get PPQN (Pulse per Quarter Note)for MIDI resolution
meta["ticks_per_quarter_note"] = msg.get_metronome()
# get time signature values
num = midData[0][2].data[0]
dem = 2**(midData[0][2].data[1])
sig = (num, dem)
meta["signature"] = sig
# Measure time signatur frequency
if sig not in sigs:
sigs[sig] = 1
else:
sigs[sig] += 1
# Filter out sequences with time signature 4/4 based on flag
if fourByFour == True:
if (num == 3 or num == 6) or (dem != 4):
return (meta, None)
# Track ingestion
nTicks = 0
# get melody and harmony notes and ticks from midi Data
melNotes, melTicks = midi_util.ingest_notes(midData[1])
harNotes, harTicks = midi_util.ingest_notes(midData[2])
# round number of ticks with given time step value
nTicks = midi_util.round_tick(max(melTicks, harTicks), timeStep)
# get melody encodings mapped to defined melody range
melSequence = midi_util.round_notes(melNotes,
nTicks,
timeStep,
R=melodyRange,
O=melodyMin)
# filter out sequences with a double note is found in melody
for i in range(melSequence.shape[0]):
if np.count_nonzero(melSequence[i, :]) > 1:
return (meta, None)
# get harmony sequence and process with Mingus
harSequence = midi_util.round_notes(harNotes, nTicks, timeStep)
# convert sharps to flats to consider compositional considerations
flat_note = {
"A#": "Bb",
"B#": "C",
"C#": "Db",
"D#": "Eb",
"E#": "F",
"F#": "Gb",
"G#": "Ab",
}
# use Mingus to identify chords from harmony notes
for i in range(harSequence.shape[0]):
# get note data
notes = np.where(harSequence[i] == 1)[0]
if len(notes) > 0:
# get note names without octave information
noteName = [
mingus.core.notes.int_to_note(note % 12) for note in notes
]
chordName = mingus.core.chords.determine(noteName, shorthand=True)
if len(chordName) == 0:
# convert to flat if chord not identified and try again
noteName = [
flat_note[n] if n in flat_note else n for n in noteName
]
chordName = mingus.core.chords.determine(noteName,
shorthand=True)
if len(chordName) == 0:
# if chord does not exist, label as NONE
if len(harmony) > 0:
harmony.append(harmony[-1])
else:
harmony.append(unkChord)
# resolve chords as major or minor for other types of chord
else:
resolvedChord = Resolve_Chords(chordName[0])
if resolvedChord:
harmony.append(resolvedChord)
else:
harmony.append(unkChord)
else:
# label as unresolve after all attempts
harmony.append(unkChord)
return (meta, (melSequence, harmony))
def parse_nottingham_to_sequence(input_filename, time_step, verbose=False):
"""
input_filename: a MIDI filename
returns a [T x D] matrix representing a sequence with T time steps over
D dimensions
"""
sequence = []
pattern = midi.read_midifile(input_filename)
metadata = {
"path": input_filename,
"name": input_filename.split("/")[-1].split(".")[0]
}
# Most nottingham midi's have 3 tracks. metadata info, melody, harmony
# throw away any tracks that don't fit this
if len(pattern) != 3:
if verbose:
"Skipping track with {} tracks".format(len(pattern))
return (metadata, None)
# ticks_per_quarter = -1
for msg in pattern[0]:
if isinstance(msg, midi.TimeSignatureEvent):
metadata["ticks_per_quarter"] = msg.get_metronome()
ticks_per_quarter = msg.get_metronome()
if verbose:
print "{}".format(input_filename)
print "Track resolution: {}".format(pattern.resolution)
print "Number of tracks: {}".format(len(pattern))
print "Time step: {}".format(time_step)
print "Ticks per quarter: {}".format(ticks_per_quarter)
# Track ingestion stage
track_ticks = 0
melody_notes, melody_ticks = midi_util.ingest_notes(pattern[1])
harmony_notes, harmony_ticks = midi_util.ingest_notes(pattern[2])
track_ticks = midi_util.round_tick(max(melody_ticks, harmony_ticks), time_step)
if verbose:
print "Track ticks (rounded): {} ({} time steps)".format(track_ticks, track_ticks/time_step)
melody_sequence = midi_util.round_notes(melody_notes, track_ticks, time_step,
R=NOTTINGHAM_MELODY_RANGE, O=NOTTINGHAM_MELODY_MIN)
for i in range(melody_sequence.shape[0]):
if np.count_nonzero(melody_sequence[i, :]) > 1:
if verbose:
print "Double note found: {}: {} ({})".format(i, np.nonzero(melody_sequence[i, :]), input_filename)
return (metadata, None)
harmony_sequence = midi_util.round_notes(harmony_notes, track_ticks, time_step)
harmonies = []
for i in range(harmony_sequence.shape[0]):
notes = np.where(harmony_sequence[i] == 1)[0]
if len(notes) > 0:
notes_shift = [ mingus.core.notes.int_to_note(h%12) for h in notes]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
# try flat combinations
notes_shift = [ SHARPS_TO_FLATS[n] if n in SHARPS_TO_FLATS else n for n in notes_shift]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
if verbose:
print "Could not determine chord: {} ({}, {}), defaulting to last steps chord" \
.format(notes_shift, input_filename, i)
if len(harmonies) > 0:
harmonies.append(harmonies[-1])
else:
harmonies.append(NO_CHORD)
else:
resolved = resolve_chord(chord[0])
if resolved:
harmonies.append(resolved)
else:
harmonies.append(NO_CHORD)
else:
harmonies.append(NO_CHORD)
return (metadata, (melody_sequence, harmonies))
def Data_to_Sequence(input_filename, time_step, verbose=False):
pattern = midi.read_midifile(input_filename)
metadata = {
"path": input_filename,
"name": input_filename.split("/")[-1].split(".")[0]
}
if len(pattern) != 3:
return (metadata, None)
# ticks_per_quarter = -1
for msg in pattern[0]:
if isinstance(msg, midi.TimeSignatureEvent):
metadata["ticks_per_quarter"] = msg.get_metronome()
num = pattern[0][2].data[0]
dem = 2** (pattern[0][2].data[1])
sig = (num, dem)
metadata["signature"] = sig
if sig not in sigs:
sigs[sig] = 1
else:
sigs[sig] += 1
if fourByFour == True:
if (num == 3 or num == 6) or (dem !=4):
return (metadata, None)
# Track ingestion stage
track_ticks = 0
melody_notes, melody_ticks = midi_util.ingest_notes(pattern[1])
harmony_notes, harmony_ticks = midi_util.ingest_notes(pattern[2])
track_ticks = midi_util.round_tick(max(melody_ticks, harmony_ticks), time_step)
if verbose:
print "Track ticks (rounded): {} ({} time steps)".format(track_ticks, track_ticks/time_step)
melody_sequence = midi_util.round_notes(melody_notes, track_ticks, time_step,
R=Melody_Range, O=Melody_Min)
for i in range(melody_sequence.shape[0]):
if np.count_nonzero(melody_sequence[i, :]) > 1:
if verbose:
print "Double note found: {}: {} ({})".format(i, np.nonzero(melody_sequence[i, :]), input_filename)
return (metadata, None)
harmony_sequence = midi_util.round_notes(harmony_notes, track_ticks, time_step)
harmonies = []
flat_note = {"A#": "Bb", "B#": "C", "C#": "Db", "D#": "Eb", "E#": "F", "F#": "Gb", "G#": "Ab",}
#Identify chords from track 1 notes using mingus library
for i in range(harmony_sequence.shape[0]):
notes = np.where(harmony_sequence[i] == 1)[0]
if len(notes) > 0:
notes_shift = [ mingus.core.notes.int_to_note(h%12) for h in notes]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
# try flat combinations
notes_shift = [ flat_note[n] if n in flat_note else n for n in notes_shift]
chord = mingus.core.chords.determine(notes_shift, shorthand=True)
if len(chord) == 0:
#print "Could not determine chord: {} ({}, {}), defaulting to last steps chord" \
# .format(notes_shift, input_filename, i)
if len(harmonies) > 0:
harmonies.append(harmonies[-1])
else:
harmonies.append(unkChord)
else:
resolved = resolve_chord(chord[0])
if resolved:
harmonies.append(resolved)
else:
harmonies.append(unkChord)
else:
harmonies.append(unkChord)
return (metadata, (melody_sequence, harmonies))