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_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 add_note_off_abs(track,
pitch,
end,
channel,
resolution=default_resolution):
off = NoteOffEvent(tick=int(resolution * end),
channel=channel,
pitch=pitch)
track.append(off)
return track
def tonal_space_note_events(coord,
start,
duration,
origin_note=60,
velocity=100):
"""
Creates the MIDI events needed to play the given tonal space
coordinate. These will be a single-note tuning event (to retune
the appropriate note), a note-on event and a note-off event.
@type coord: tuple
@param coord: 3D tonal space coordinate
@type start: int
@param start: start time of note in ticks
@type duration: int
@param duration: length of the note in ticks
@type origin_note: int
@param origin_note: midi note number to assume the origin of the
tonal space is equal to in pitch (default 60, middle C)
@rtype: tuple
@return: (tuning event, note on event, note off event)
"""
# Work out what note to retune for the root and how
change = tonal_space_tuning(coord)
note = change[0]
# Create the tuning event
tuning = single_note_tuning_event([change])
tuning.tick = start
# Play the note
note_on = NoteOnEvent()
note_on.pitch = note
note_on.velocity = velocity
note_on.tick = start
# Stop the note
note_off = NoteOffEvent()
note_off.pitch = note
note_off.tick = start + duration
note_off.velocity = velocity
return (tuning, note_on, note_off)
def tonal_space_note_events(coord, start, duration, origin_note=60, velocity=100):
"""
Creates the MIDI events needed to play the given tonal space
coordinate. These will be a single-note tuning event (to retune
the appropriate note), a note-on event and a note-off event.
@type coord: tuple
@param coord: 3D tonal space coordinate
@type start: int
@param start: start time of note in ticks
@type duration: int
@param duration: length of the note in ticks
@type origin_note: int
@param origin_note: midi note number to assume the origin of the
tonal space is equal to in pitch (default 60, middle C)
@rtype: tuple
@return: (tuning event, note on event, note off event)
"""
# Work out what note to retune for the root and how
change = tonal_space_tuning(coord)
note = change[0]
# Create the tuning event
tuning = single_note_tuning_event([change])
tuning.tick = start
# Play the note
note_on = NoteOnEvent()
note_on.pitch = note
note_on.velocity = velocity
note_on.tick = start
# Stop the note
note_off = NoteOffEvent()
note_off.pitch = note
note_off.tick = start+duration
note_off.velocity = velocity
return (tuning, note_on, note_off)
def generate(self, overlay=None, offset=0):
"""
Generates a midi stream.
"""
octaves = 1
if overlay is not None:
stream = overlay
# Use organ sound
instrument = 23
# Find the last channel used in the file we're overlaying
channel = max(ev.channel for ev in stream.trackpool) + 1
volume = 50
else:
stream = EventStream()
stream.resolution = self.resolution
# Just use piano
instrument = 0
channel = 0
volume = 127
stream.add_track()
pc = ProgramChangeEvent()
pc.value = instrument
pc.tick = 0
pc.channel = channel
stream.add_event(pc)
# Length of each chord in midi ticks
chord_length = int(self.resolution * self.chord_length)
times = [i * chord_length + offset for i in range(len(self.labels))]
pending_note_offs = []
for label, time in zip(self.labels, times):
chord_root = label.root
# Work out the notes for this chord
triad_notes = [(chord_root + note) % (octaves*12) + 72 for \
note in self.chord_vocab[label.label]]
# Add the root in the octave two below
triad_notes.append(chord_root + 48)
# Add note offs for notes already on
for noff in pending_note_offs:
noff.tick = time - 1
stream.add_event(noff)
pending_note_offs = []
if self.text_events:
# Add a text event to represent the chord label
tevent = LyricsEvent()
tevent.data = "%s\n" % label
tevent.tick = time
stream.add_event(tevent)
# Add a note-on and off event for each note
for note in triad_notes:
non = NoteOnEvent()
non.tick = time
non.pitch = note
non.channel = channel
non.velocity = volume
stream.add_event(non)
# Hold the note until the next chord is played
noff = NoteOffEvent()
noff.pitch = note
noff.channel = channel
noff.velocity = volume
pending_note_offs.append(noff)
# Add the last remaining note offs
for noff in pending_note_offs:
noff.tick = time + chord_length
stream.add_event(noff)
return stream
def generate(self, overlay=None, offset=0):
"""
Generates a midi stream.
"""
octaves = 1
if overlay is not None:
stream = overlay
# Use organ sound
instrument = 23
# Find the last channel used in the file we're overlaying
channel = max(ev.channel for ev in stream.trackpool) + 1
volume = 50
else:
stream = EventStream()
stream.resolution = self.resolution
# Just use piano
instrument = 0
channel = 0
volume = 127
stream.add_track()
pc = ProgramChangeEvent()
pc.value = instrument
pc.tick = 0
pc.channel = channel
stream.add_event(pc)
# Length of each chord in midi ticks
chord_length = int(self.resolution * self.chord_length)
times = [i*chord_length + offset for i in range(len(self.labels))]
pending_note_offs = []
for label,time in zip(self.labels, times):
chord_root = label.root
# Work out the notes for this chord
triad_notes = [(chord_root + note) % (octaves*12) + 72 for \
note in self.chord_vocab[label.label]]
# Add the root in the octave two below
triad_notes.append(chord_root + 48)
# Add note offs for notes already on
for noff in pending_note_offs:
noff.tick = time-1
stream.add_event(noff)
pending_note_offs = []
if self.text_events:
# Add a text event to represent the chord label
tevent = LyricsEvent()
tevent.data = "%s\n" % label
tevent.tick = time
stream.add_event(tevent)
# Add a note-on and off event for each note
for note in triad_notes:
non = NoteOnEvent()
non.tick = time
non.pitch = note
non.channel = channel
non.velocity = volume
stream.add_event(non)
# Hold the note until the next chord is played
noff = NoteOffEvent()
noff.pitch = note
noff.channel = channel
noff.velocity = volume
pending_note_offs.append(noff)
# Add the last remaining note offs
for noff in pending_note_offs:
noff.tick = time+chord_length
stream.add_event(noff)
return stream
def generate(self, overlay=None, offset=0):
"""
Generates a midi stream.
"""
octaves = 1
if overlay is not None:
stream = overlay
# Use organ sound
instrument = 23
# Find the last channel used in the file we're overlaying
channel = max(ev.channel for ev in stream.trackpool) + 1
volume = 30
else:
stream = EventStream()
stream.resolution = self.resolution
# Just use piano
instrument = 0
channel = 0
volume = 127
stream.add_track()
pc = ProgramChangeEvent()
pc.value = instrument
pc.tick = 0
pc.channel = channel
stream.add_event(pc)
# Length of each chord in midi ticks
chord_length = int(self.resolution * self.chord_length)
if self.times is None:
times = [
i * chord_length + offset for i in range(len(self.labels))
]
else:
times = [t + offset for t in self.times]
formatter = getattr(self, 'formatter')
pending_note_offs = []
for (tonic, mode, chord), time in zip(self.labels, times):
scale_chord_root = constants.CHORD_NOTES[mode][chord][0]
chord_root = (tonic + scale_chord_root) % 12
triad_type = constants.SCALE_TRIADS[mode][chord]
# Work out the notes for this chord
triad_notes = [(chord_root + note) % (octaves * 12) + 72
for note in constants.TRIAD_NOTES[triad_type]]
# Add the root in the octave two below
triad_notes.append(chord_root + 48)
# Add note offs for notes already on
for noff in pending_note_offs:
noff.tick = time - 1
stream.add_event(noff)
pending_note_offs = []
if self.text_events:
# Add a text event to represent the chord label
tevent = LyricsEvent()
label = formatter((tonic, mode, chord))
tevent.data = "%s\n" % label
tevent.tick = time
stream.add_event(tevent)
# Add a note-on and off event for each note
for note in triad_notes:
non = NoteOnEvent()
non.tick = time
non.pitch = note
non.channel = channel
non.velocity = volume
stream.add_event(non)
# Hold the note until the next chord is played
noff = NoteOffEvent()
noff.pitch = note
noff.channel = channel
noff.velocity = volume
pending_note_offs.append(noff)
# Add the last remaining note offs
for noff in pending_note_offs:
noff.tick = time + chord_length
stream.add_event(noff)
return stream
def generate(self, overlay=None, offset=0):
"""
Generates a midi stream.
"""
octaves = 1
if overlay is not None:
stream = overlay
# Use organ sound
instrument = 23
# Find the last channel used in the file we're overlaying
channel = max(ev.channel for ev in stream.trackpool) + 1
volume = 30
else:
stream = EventStream()
stream.resolution = self.resolution
# Just use piano
instrument = 0
channel = 0
volume = 127
stream.add_track()
pc = ProgramChangeEvent()
pc.value = instrument
pc.tick = 0
pc.channel = channel
stream.add_event(pc)
# Length of each chord in midi ticks
chord_length = int(self.resolution * self.chord_length)
if self.times is None:
times = [i*chord_length + offset for i in range(len(self.labels))]
else:
times = [t+offset for t in self.times]
formatter = getattr(self, 'formatter')
pending_note_offs = []
for (tonic,mode,chord),time in zip(self.labels, times):
scale_chord_root = constants.CHORD_NOTES[mode][chord][0]
chord_root = (tonic+scale_chord_root) % 12
triad_type = constants.SCALE_TRIADS[mode][chord]
# Work out the notes for this chord
triad_notes = [(chord_root + note) % (octaves*12) + 72 for note in constants.TRIAD_NOTES[triad_type]]
# Add the root in the octave two below
triad_notes.append(chord_root + 48)
# Add note offs for notes already on
for noff in pending_note_offs:
noff.tick = time-1
stream.add_event(noff)
pending_note_offs = []
if self.text_events:
# Add a text event to represent the chord label
tevent = LyricsEvent()
label = formatter((tonic,mode,chord))
tevent.data = "%s\n" % label
tevent.tick = time
stream.add_event(tevent)
# Add a note-on and off event for each note
for note in triad_notes:
non = NoteOnEvent()
non.tick = time
non.pitch = note
non.channel = channel
non.velocity = volume
stream.add_event(non)
# Hold the note until the next chord is played
noff = NoteOffEvent()
noff.pitch = note
noff.channel = channel
noff.velocity = volume
pending_note_offs.append(noff)
# Add the last remaining note offs
for noff in pending_note_offs:
noff.tick = time+chord_length
stream.add_event(noff)
return stream
def remove_duplicate_notes(stream, replay=False):
"""
Some processing operations, like L{simplify}, can leave a midi file with
the same note being played twice at the same time.
To avoid the confusion this leads to, it's best to remove these. This
function will remove multiple instances of the same note being played
simultaneously (in the same track and channel) and insert note-off events
before a note is replayed that's already being played.
This can lead to some strange effects if multiple instruments have been
reduced to one, as in the case of L{simplify}. You may wish to keep
seperate instruments on separate channels to avoid this.
@type replay: bool
@param replay: if True, notes that are played while they're already sounding
while be replayed - taken off and put back on. Otherwise, such notes
will be ignored.
"""
to_remove = []
to_add = {}
for i, track in stream.tracklist.items():
notes_on = {}
last_instance = {}
for ev in sorted(track):
if type(ev) == NoteOnEvent and ev.velocity > 0:
# Note on
if ev.channel in notes_on and \
ev.pitch in notes_on[ev.channel]:
# Note is already being played
previous = last_instance[ev.channel][ev.pitch]
if not replay or previous.tick == ev.tick:
# Simultaneous duplicate, or we don't want to replay
# resounded notes
# Remove this one
to_remove.append(ev)
else:
# Replay: insert a note-off
note_off = NoteOffEvent()
note_off.pitch = ev.pitch
note_off.channel = ev.channel
note_off.velocity = 127
note_off.tick = ev.tick - 1
to_add.setdefault(i, []).append(note_off)
# Increase the count of instances of this note being played
notes_on.setdefault(ev.channel, {}).setdefault(ev.pitch, 0)
notes_on[ev.channel][ev.pitch] += 1
last_instance.setdefault(ev.channel, {})[ev.pitch] = ev
elif type(ev) == NoteOffEvent or \
(type(ev) == NoteOnEvent and ev.velocity == 0):
# Note off
if ev.channel not in notes_on or \
ev.pitch not in notes_on[ev.channel]:
# Note is not currently being played
# Remove this note off
to_remove.append(ev)
else:
# Decrease the count of instances of this note being played
notes_on[ev.channel][ev.pitch] -= 1
if notes_on[ev.channel][ev.pitch] == 0:
# Note was only being played once
# Leave the note off in there
del notes_on[ev.channel][ev.pitch]
else:
# Note was being played multiple times
# Decrease the count, but don't include this note off
to_remove.append(ev)
# Remove all events scheduled for removal
stream.remove_event_instances(to_remove)
# Add all events scheduled to addition
for trk, evs in to_add.items():
stream.curtrack = trk
for ev in evs:
stream.add_event(ev)
def simplify(stream,
remove_drums=False,
remove_pc=False,
remove_all_text=False,
one_track=False,
remove_tempo=False,
remove_control=False,
one_channel=False,
remove_misc_control=False,
real_note_offs=False,
remove_duplicates=False):
"""
Filters a midi L{midi.EventStream} to simplify it. This is useful
as a preprocessing step before taking midi input to an algorithm,
for example, to make it clearer what the algorithm is using.
Use kwargs to determine what filters will be applied. Without any
kwargs, the stream will just be left as it was.
Returns a filtered copy of the stream.
@type remove_drums: bool
@param remove_drums: filter out all channel 10 events
@type remove_pc: bool
@param remove_pc: filter out all program change events
@type remove_all_text: bool
@param remove_all_text: filter out any text events. This includes
copyright, text, track name, lyrics.
@type one_track: bool
@param one_track: reduce everything to just one track
@type remove_tempo: bool
@param remove_tempo: filter out all tempo events
@type remove_control: bool
@param remove_control: filter out all control change events
@type one_channel: bool
@param one_channel: use only one channel: set the channel of
every event to 0
@type remove_misc_control: bool
@param remove_misc_control: filters a miscellany of device
control events: aftertouch, channel aftertouch, pitch wheel,
sysex, port
@type real_note_offs: bool
@param real_note_offs: replace 0-velocity note-ons with actual
note-offs. Some midi files use one, some the other
"""
from midi import EventStream, TextEvent, ProgramChangeEvent, \
CopyrightEvent, TrackNameEvent, \
SetTempoEvent, ControlChangeEvent, AfterTouchEvent, \
ChannelAfterTouchEvent, PitchWheelEvent, SysExEvent, \
LyricsEvent, PortEvent, CuePointEvent, MarkerEvent, EndOfTrackEvent
import copy
# Empty stream to which we'll add the events we don't filter
new_stream = EventStream()
new_stream.resolution = stream.resolution
new_stream.format = stream.format
# Work out when the first note starts in the input stream
input_start = first_note_tick(stream)
# Filter track by track
for track in stream:
track_events = []
for ev in sorted(track):
# Don't add EOTs - they get added automatically
if type(ev) == EndOfTrackEvent:
continue
ev = copy.deepcopy(ev)
# Each filter may modify the event or continue to filter it altogether
if remove_drums:
# Filter out any channel 10 events, which is typically
# reserved for drums
if ev.channel == 9 and \
type(ev) in (NoteOnEvent, NoteOffEvent):
continue
if remove_pc:
# Filter out any program change events
if type(ev) == ProgramChangeEvent:
continue
if remove_all_text:
# Filter out any types of text event
if type(ev) in (TextEvent, CopyrightEvent, TrackNameEvent,
LyricsEvent, CuePointEvent, MarkerEvent):
continue
if remove_tempo:
# Filter out any tempo events
if type(ev) == SetTempoEvent:
continue
if remove_control:
# Filter out any control change events
if type(ev) == ControlChangeEvent:
continue
if remove_misc_control:
# Filter out various types of control events
if type(ev) in (AfterTouchEvent, ChannelAfterTouchEvent,
ChannelAfterTouchEvent, PitchWheelEvent,
SysExEvent, PortEvent):
continue
if real_note_offs:
# Replace 0-velocity note-ons with note-offs
if type(ev) == NoteOnEvent and ev.velocity == 0:
new_ev = NoteOffEvent()
new_ev.pitch = ev.pitch
new_ev.channel = ev.channel
new_ev.tick = ev.tick
ev = new_ev
if one_channel:
ev.channel = 0
track_events.append(ev)
# If there are events left in the track, add them all as a new track
if len(track_events) > 1:
if not one_track or len(new_stream.tracklist) == 0:
new_stream.add_track()
for ev in track_events:
new_stream.add_event(ev)
track_events = []
for track in stream:
track.sort()
# Work out when the first note happens now
result_start = first_note_tick(new_stream)
# Move all events after and including this sooner so the music
# starts at the same point it did before
shift = result_start - input_start
before_start = max(input_start - 1, 0)
if shift > 0:
for ev in new_stream.trackpool:
if ev.tick >= result_start:
ev.tick -= shift
elif ev.tick < result_start and ev.tick >= input_start:
# This event happened in a region that no longer contains notes
# Move it back to before what's now the first note
ev.tick = before_start
new_stream.trackpool.sort()
if remove_duplicates:
# Get rid of now duplicate events
remove_duplicate_notes(new_stream, replay=True)
return new_stream
def remove_duplicate_notes(stream, replay=False):
"""
Some processing operations, like L{simplify}, can leave a midi file with
the same note being played twice at the same time.
To avoid the confusion this leads to, it's best to remove these. This
function will remove multiple instances of the same note being played
simultaneously (in the same track and channel) and insert note-off events
before a note is replayed that's already being played.
This can lead to some strange effects if multiple instruments have been
reduced to one, as in the case of L{simplify}. You may wish to keep
seperate instruments on separate channels to avoid this.
@type replay: bool
@param replay: if True, notes that are played while they're already sounding
while be replayed - taken off and put back on. Otherwise, such notes
will be ignored.
"""
to_remove = []
to_add = {}
for i,track in stream.tracklist.items():
notes_on = {}
last_instance = {}
for ev in sorted(track):
if type(ev) == NoteOnEvent and ev.velocity > 0:
# Note on
if ev.channel in notes_on and \
ev.pitch in notes_on[ev.channel]:
# Note is already being played
previous = last_instance[ev.channel][ev.pitch]
if not replay or previous.tick == ev.tick:
# Simultaneous duplicate, or we don't want to replay
# resounded notes
# Remove this one
to_remove.append(ev)
else:
# Replay: insert a note-off
note_off = NoteOffEvent()
note_off.pitch = ev.pitch
note_off.channel = ev.channel
note_off.velocity = 127
note_off.tick = ev.tick-1
to_add.setdefault(i, []).append(note_off)
# Increase the count of instances of this note being played
notes_on.setdefault(ev.channel, {}).setdefault(ev.pitch, 0)
notes_on[ev.channel][ev.pitch] += 1
last_instance.setdefault(ev.channel, {})[ev.pitch] = ev
elif type(ev) == NoteOffEvent or \
(type(ev) == NoteOnEvent and ev.velocity == 0):
# Note off
if ev.channel not in notes_on or \
ev.pitch not in notes_on[ev.channel]:
# Note is not currently being played
# Remove this note off
to_remove.append(ev)
else:
# Decrease the count of instances of this note being played
notes_on[ev.channel][ev.pitch] -= 1
if notes_on[ev.channel][ev.pitch] == 0:
# Note was only being played once
# Leave the note off in there
del notes_on[ev.channel][ev.pitch]
else:
# Note was being played multiple times
# Decrease the count, but don't include this note off
to_remove.append(ev)
# Remove all events scheduled for removal
stream.remove_event_instances(to_remove)
# Add all events scheduled to addition
for trk,evs in to_add.items():
stream.curtrack = trk
for ev in evs:
stream.add_event(ev)
def simplify(stream, remove_drums=False, remove_pc=False,
remove_all_text=False, one_track=False, remove_tempo=False,
remove_control=False, one_channel=False,
remove_misc_control=False, real_note_offs=False, remove_duplicates=False):
"""
Filters a midi L{midi.EventStream} to simplify it. This is useful
as a preprocessing step before taking midi input to an algorithm,
for example, to make it clearer what the algorithm is using.
Use kwargs to determine what filters will be applied. Without any
kwargs, the stream will just be left as it was.
Returns a filtered copy of the stream.
@type remove_drums: bool
@param remove_drums: filter out all channel 10 events
@type remove_pc: bool
@param remove_pc: filter out all program change events
@type remove_all_text: bool
@param remove_all_text: filter out any text events. This includes
copyright, text, track name, lyrics.
@type one_track: bool
@param one_track: reduce everything to just one track
@type remove_tempo: bool
@param remove_tempo: filter out all tempo events
@type remove_control: bool
@param remove_control: filter out all control change events
@type one_channel: bool
@param one_channel: use only one channel: set the channel of
every event to 0
@type remove_misc_control: bool
@param remove_misc_control: filters a miscellany of device
control events: aftertouch, channel aftertouch, pitch wheel,
sysex, port
@type real_note_offs: bool
@param real_note_offs: replace 0-velocity note-ons with actual
note-offs. Some midi files use one, some the other
"""
from midi import EventStream, TextEvent, ProgramChangeEvent, \
CopyrightEvent, TrackNameEvent, \
SetTempoEvent, ControlChangeEvent, AfterTouchEvent, \
ChannelAfterTouchEvent, PitchWheelEvent, SysExEvent, \
LyricsEvent, PortEvent, CuePointEvent, MarkerEvent, EndOfTrackEvent
import copy
# Empty stream to which we'll add the events we don't filter
new_stream = EventStream()
new_stream.resolution = stream.resolution
new_stream.format = stream.format
# Work out when the first note starts in the input stream
input_start = first_note_tick(stream)
# Filter track by track
for track in stream:
track_events = []
for ev in sorted(track):
# Don't add EOTs - they get added automatically
if type(ev) == EndOfTrackEvent:
continue
ev = copy.deepcopy(ev)
# Each filter may modify the event or continue to filter it altogether
if remove_drums:
# Filter out any channel 10 events, which is typically
# reserved for drums
if ev.channel == 9 and \
type(ev) in (NoteOnEvent, NoteOffEvent):
continue
if remove_pc:
# Filter out any program change events
if type(ev) == ProgramChangeEvent:
continue
if remove_all_text:
# Filter out any types of text event
if type(ev) in (TextEvent, CopyrightEvent, TrackNameEvent,
LyricsEvent, CuePointEvent, MarkerEvent):
continue
if remove_tempo:
# Filter out any tempo events
if type(ev) == SetTempoEvent:
continue
if remove_control:
# Filter out any control change events
if type(ev) == ControlChangeEvent:
continue
if remove_misc_control:
# Filter out various types of control events
if type(ev) in (AfterTouchEvent, ChannelAfterTouchEvent,
ChannelAfterTouchEvent, PitchWheelEvent,
SysExEvent, PortEvent):
continue
if real_note_offs:
# Replace 0-velocity note-ons with note-offs
if type(ev) == NoteOnEvent and ev.velocity == 0:
new_ev = NoteOffEvent()
new_ev.pitch = ev.pitch
new_ev.channel = ev.channel
new_ev.tick = ev.tick
ev = new_ev
if one_channel:
ev.channel = 0
track_events.append(ev)
# If there are events left in the track, add them all as a new track
if len(track_events) > 1:
if not one_track or len(new_stream.tracklist) == 0:
new_stream.add_track()
for ev in track_events:
new_stream.add_event(ev)
track_events = []
for track in stream:
track.sort()
# Work out when the first note happens now
result_start = first_note_tick(new_stream)
# Move all events after and including this sooner so the music
# starts at the same point it did before
shift = result_start - input_start
before_start = max(input_start-1, 0)
if shift > 0:
for ev in new_stream.trackpool:
if ev.tick >= result_start:
ev.tick -= shift
elif ev.tick < result_start and ev.tick >= input_start:
# This event happened in a region that no longer contains notes
# Move it back to before what's now the first note
ev.tick = before_start
new_stream.trackpool.sort()
if remove_duplicates:
# Get rid of now duplicate events
remove_duplicate_notes(new_stream, replay=True)
return new_stream