def separate_track(original_track, num_track=1, default_tempo=100):
set_tempo_event = SetTempoEvent()
set_tempo_event.set_bpm(default_tempo)
original_track.make_ticks_abs()
channel_set = set()
for event in original_track:
if type(event) is NoteOnEvent or type(event) is NoteOffEvent:
channel_set.add(event.channel)
if type(event) is SetTempoEvent:
set_tempo_event = event
channel_track_map = {}
index = 0
for channel in channel_set:
channel_track_map[channel] = index
index += 1
tracks = []
for i in range(max(num_track, len(channel_set))):
tracks.append(
Track(events=[MIDI.copy_event(set_tempo_event)],
tick_relative=False))
for event in original_track:
if type(event) is NoteOnEvent or type(event) is NoteOffEvent:
copied_event = MIDI.copy_event(event)
tracks[channel_track_map[copied_event.channel]].append(
copied_event)
for track in tracks:
track.sort()
track.make_ticks_rel()
original_track.make_ticks_rel()
return tracks
def to_midi(self):
"""
Constructs a L{MIDI EventStream<midi.EventStream>} from the
data in this stream.
This can then be output to a file to be played.
Note that TPCNotes will be output as normal MIDI notes. We
can't do anything of the clever tuning stuff that we can do
with tonal space coordinates, since we'd need to do a further
step of analysis to work out the fully specified TS point from
the pitch class.
"""
tempo = 120
from midi import EventStream, NoteOffEvent, NoteOnEvent, SetTempoEvent
mid = EventStream()
mid.add_track()
# Set the tempo first at the beginning
temp = SetTempoEvent()
temp.tempo = tempo
temp.tick = 0
mid.add_event(temp)
# Work out how many ticks there are in a millisecond
ticks_per_ms = float(mid.resolution) * tempo / 60000
# Create midi events for every event in our stream
for ev in self.events:
if isinstance(ev, TPCNoteEvent):
# Create note-on and note-off events
note = ev.note
noteon = NoteOnEvent()
noteon.pitch = note
noteon.tick = int(ev.start * ticks_per_ms)
noteon.velocity = 100
mid.add_event(noteon)
noteoff = NoteOffEvent()
noteoff.pitch = note
noteoff.tick = int(ev.end * ticks_per_ms)
noteoff.velocity = 100
mid.add_event(noteoff)
elif isinstance(ev, (ChordEvent,BeatEvent)):
# These events don't affect the midi data
continue
else:
raise TypeError, "event type %s not recognised by "\
"MIDI converter." % type(ev).__name__
return mid
def to_midi(self):
"""
Constructs a L{MIDI EventStream<midi.EventStream>} from the
data in this stream.
This can then be output to a file to be played.
Note that TPCNotes will be output as normal MIDI notes. We
can't do anything of the clever tuning stuff that we can do
with tonal space coordinates, since we'd need to do a further
step of analysis to work out the fully specified TS point from
the pitch class.
"""
tempo = 120
from midi import EventStream, NoteOffEvent, NoteOnEvent, SetTempoEvent
mid = EventStream()
mid.add_track()
# Set the tempo first at the beginning
temp = SetTempoEvent()
temp.tempo = tempo
temp.tick = 0
mid.add_event(temp)
# Work out how many ticks there are in a millisecond
ticks_per_ms = float(mid.resolution) * tempo / 60000
# Create midi events for every event in our stream
for ev in self.events:
if isinstance(ev, TPCNoteEvent):
# Create note-on and note-off events
note = ev.note
noteon = NoteOnEvent()
noteon.pitch = note
noteon.tick = int(ev.start * ticks_per_ms)
noteon.velocity = 100
mid.add_event(noteon)
noteoff = NoteOffEvent()
noteoff.pitch = note
noteoff.tick = int(ev.end * ticks_per_ms)
noteoff.velocity = 100
mid.add_event(noteoff)
elif isinstance(ev, (ChordEvent, BeatEvent)):
# These events don't affect the midi data
continue
else:
raise TypeError, "event type %s not recognised by "\
"MIDI converter." % type(ev).__name__
return mid
def copy_track(original_track, channel_offset=1, default_tempo=100):
set_tempo_event = SetTempoEvent()
set_tempo_event.set_bpm(default_tempo)
for event in original_track:
if type(event) is SetTempoEvent:
set_tempo_event = event
new_track = Track(events=[MIDI.copy_event(set_tempo_event)],
tick_relative=True)
for event in original_track:
if type(event) is NoteOnEvent or type(event) is NoteOffEvent:
copied_event = MIDI.copy_event(event)
copied_event.channel += channel_offset
new_track.append(copied_event)
return new_track
def from_data(data, directives):
# Build the tone matrix straight up
state = {
'equal_temperament' : False,
'double_root' : False,
'envelope' : None,
'origin' : 440,
'time' : 0.0,
}
tone_matrix = ToneMatrix()
#### Prepare a midi stream
mid = EventStream()
mid.add_track()
# Add a tempo event
tempo = SetTempoEvent()
tempo.tempo = directives['tempo']
tempo.tick = 0
mid.add_event(tempo)
# Each line represents a single chord or some kind of directive
for line in data:
first_word = line.split()[0].lower()
if "=" in line:
# This is an assignment
key, __, value = line.partition("=")
key = key.strip()
value = value.strip()
# Check it's valid
if key == "equal_temperament":
if value not in ['off','on']:
raise HarmonicalInputFileReadError, \
"equal_temperament must be 'off' or 'on', "\
"not '%s'" % value
value = (value == 'on')
elif key == "origin":
try:
value = int(value)
except ValueError:
# Try interpreting as a coordinate
try:
coord = _read_coord(value)
except HarmonicalInputFileReadError:
raise HarmonicalInputFileReadError, "origin "\
"value must be an integer or a coordinate."
value = _get_pitch(coord)
elif key == "double_root":
if value not in ['off','on']:
raise HarmonicalInputFileReadError, \
"double_root must be 'off' or 'on', "\
"not '%s'" % value
value = (value == 'on')
elif key == "envelope":
if value not in ENVELOPES:
raise HarmonicalInputFileReadError, "unknown "\
"envelope '%s'. Must be one of: %s" % \
(value, ", ".join(ENVELOPES.keys()))
value = ENVELOPES[value]()
elif key == "program":
# Midi program change
try:
value = int(value)
if value > 127 or value < 0:
raise ValueError
except ValueError:
raise HarmonicalInputFileReadError, "invalid program "\
"change: %s. Should be an integer 0-127" % value
pchange = ProgramChangeEvent()
pchange.value = value
pchange.tick = int(state['time'] * mid.resolution)
mid.add_event(pchange)
else:
raise HarmonicalInputFileReadError, "invalid "\
"assignment key: '%s'" % key
# Make this assignment when we get to it in the score
state[key] = value
elif first_word == "rest":
tokens = line.split()
duration = _get_duration(tokens)
# Just move the time counter on without doing anything
state['time'] += duration
elif first_word == "chord":
tokens = line.lstrip("chord").split()
duration = _get_duration(tokens)
root = _get_root(tokens)
volume = _get_volume(tokens)
sec_duration = _qn_to_seconds(duration)
# Must be just a chord type left
if len(tokens) > 1:
raise HarmonicalInputFileReadError, "chord must "\
"include just a chord type"
if len(tokens) == 0:
ctype = ''
else:
ctype = tokens[0]
# Add the chord to the tone matrix
tone_matrix.add_tone(
_qn_to_seconds(state['time']),
SineChordEvent(
_get_pitch(root),
ctype,
duration=sec_duration,
amplitude=volume,
equal_temperament=state['equal_temperament'],
double_root=state['double_root'],
envelope=state['envelope']
)
)
# Add the same chord to the midi file
tick_time = int(mid.resolution * state['time'])
tick_duration = int(duration * mid.resolution)
# TODO: currently this will always treat C as the origin
# even if you change it with directives
events = events_for_chord(root,
ctype,
tick_time,
tick_duration,
velocity = int(volume*127),
equal_temperament=state['equal_temperament'],
double_root=state['double_root'])
for ev in events:
mid.add_event(ev)
# Move the timer on ready for the next chord
state['time'] += duration
elif first_word in ["tones", "t"]:
# Must be a chord made up of coordinates
tokens = line.lstrip("tones").split()
duration = _get_duration(tokens)
root = _get_root(tokens)
volume = _get_volume(tokens)
sec_duration = _qn_to_seconds(duration)
# The rest should be the list of coordinates
coordinates = [_read_coord(token) for token in tokens]
# Add the chord to the tone matrix
tone_matrix.add_tone(
_qn_to_seconds(state['time']),
SineClusterEvent(
_get_pitch(root),
coordinates,
duration=sec_duration,
amplitude=volume,
equal_temperament=state['equal_temperament'],
double_root=state['double_root'],
envelope=state['envelope']
)
)
# Add the same chord to the midi file
tick_time = int(mid.resolution * state['time'])
tick_duration = int(duration * mid.resolution)
for note in coordinates:
# TODO: currently this will always treat C as the origin
# even if you change it with directives
events = tonal_space_note_events(note,
tick_time,
tick_duration,
velocity = int(volume*127))
if state['equal_temperament']:
# Omit tuning event (the first one)
events = events[1:]
for ev in events:
mid.add_event(ev)
# Move the timer on ready for the next chord
state['time'] += duration
else:
raise HarmonicalInputFileReadError, "could not make sense "\
"of the line: %s" % line
return ChordInputFile(tone_matrix, midi_file=mid)
def render(self):
"""
Creates MIDI data from the path and chord types.
@rtype: midi.EventStream
@return: an event stream containing all the midi events
"""
mid = EventStream()
mid.add_track()
# Set the tempo at the beginning
tempo = SetTempoEvent()
tempo.tempo = self.tempo
mid.add_event(tempo)
# Set the instrument at the beginning
instr = ProgramChangeEvent()
instr.value = self.instrument
mid.add_event(instr)
beat_length = mid.resolution
# Work out when each root change occurs
time = Fraction(0)
root_times = []
for root, length in self.path:
root_times.append((root, time))
time += length
def _root_at_time(time):
current_root = root_times[0][0]
for root, rtime in root_times[1:]:
# Move through root until we get the first one that
# occurs after the previous time
if rtime > time:
return current_root
current_root = root
# If we're beyond the time of the last root, use that one
return current_root
# Add each chord
time = Fraction(0)
bass_events = []
bass = self.bass_root is not None
for chord_type, length in self.chord_types:
tick_length = length * beat_length - 10
tick_time = time * beat_length
# Find out what root we're on at this time
root = _root_at_time(time)
# Add all the necessary events for this chord
chord_events = events_for_chord(
root,
chord_type,
int(tick_time),
int(tick_length),
equal_temperament=self.equal_temperament,
root_octave=self.root_octave,
double_root=(self.double_root or bass))
if bass:
# Add the bass note to the bass track
bass_events.extend([copy.copy(ev) for ev in chord_events[-1]])
if bass and not self.double_root:
# Remove the doubled root that we got for the bass line
chord_events = sum(chord_events[:-1], [])
# Add the main chord notes to the midi track
for ev in chord_events:
mid.add_event(ev)
time += length
if bass:
bass_channel = 1
# Add another track to the midi file for the bass notes
mid.add_track()
# Select a bass instrument - picked bass
instr = ProgramChangeEvent()
instr.value = 33
instr.channel = bass_channel
mid.add_event(instr)
# Add all the bass notes
for ev in bass_events:
ev.channel = bass_channel
mid.add_event(ev)
return mid
def render(self):
"""
Creates MIDI data from the path and chord types.
@rtype: midi.EventStream
@return: an event stream containing all the midi events
"""
mid = EventStream()
mid.add_track()
# Set the tempo at the beginning
tempo = SetTempoEvent()
tempo.tempo = self.tempo
mid.add_event(tempo)
# Set the instrument at the beginning
instr = ProgramChangeEvent()
instr.value = self.instrument
mid.add_event(instr)
beat_length = mid.resolution
# Work out when each root change occurs
time = Fraction(0)
root_times = []
for root,length in self.path:
root_times.append((root,time))
time += length
def _root_at_time(time):
current_root = root_times[0][0]
for root,rtime in root_times[1:]:
# Move through root until we get the first one that
# occurs after the previous time
if rtime > time:
return current_root
current_root = root
# If we're beyond the time of the last root, use that one
return current_root
# Add each chord
time = Fraction(0)
bass_events = []
bass = self.bass_root is not None
for chord_type,length in self.chord_types:
tick_length = length * beat_length - 10
tick_time = time * beat_length
# Find out what root we're on at this time
root = _root_at_time(time)
# Add all the necessary events for this chord
chord_events = events_for_chord(root, chord_type, int(tick_time),
int(tick_length),
equal_temperament=self.equal_temperament,
root_octave=self.root_octave,
double_root=(self.double_root or bass))
if bass:
# Add the bass note to the bass track
bass_events.extend([copy.copy(ev) for ev in chord_events[-1]])
if bass and not self.double_root:
# Remove the doubled root that we got for the bass line
chord_events = sum(chord_events[:-1], [])
# Add the main chord notes to the midi track
for ev in chord_events:
mid.add_event(ev)
time += length
if bass:
bass_channel = 1
# Add another track to the midi file for the bass notes
mid.add_track()
# Select a bass instrument - picked bass
instr = ProgramChangeEvent()
instr.value = 33
instr.channel = bass_channel
mid.add_event(instr)
# Add all the bass notes
for ev in bass_events:
ev.channel = bass_channel
mid.add_event(ev)
return mid
def copy_event(event):
if type(event) is SetTempoEvent:
new_event = SetTempoEvent()
new_event.tick = event.tick
new_event.data[0] = event.data[0]
new_event.data[1] = event.data[1]
new_event.data[2] = event.data[2]
return new_event
elif type(event) is NoteOnEvent:
new_event = NoteOnEvent()
new_event.tick = event.tick
new_event.channel = event.channel
new_event.data[0] = event.data[0]
new_event.data[1] = event.data[1]
return new_event
elif type(event) is NoteOffEvent:
new_event = NoteOffEvent()
new_event.tick = event.tick
new_event.channel = event.channel
new_event.data[0] = event.data[0]
new_event.data[1] = event.data[1]
return new_event
elif type(event) is ProgramChangeEvent:
new_event = ProgramChangeEvent
new_event.tick = event.tick
new_event.channel = event.channel
new_event.data[0] = event.data[0]
return new_event
else:
raise ('Not Supported')
def new_track(tempo=100):
track = Track()
set_tempo_event = SetTempoEvent()
set_tempo_event.set_bpm(tempo)
track.append(set_tempo_event)
return track