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midi.py
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midi.py
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# -*- coding: utf-8 -*-
# Songwrite 2
# Copyright (C) 2001-2010 Jean-Baptiste LAMY -- [email protected]
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# More info on Rich Tablature Midi format here:
# http://www.tabledit.com/midi/rich_midi_tablature_format.html
# MIDI info:
# http://wearcam.org/ece516/MIDIspec.htm
import sys, struct, math
import songwrite2.model as model
def apply_syncope(mesure, time):
if (mesure.rythm1 == 6) and (mesure.rythm2 == 8): # Jig
t = (time - mesure.time) % 144
if t < 48: t = t * 1.2 # First half, longer
elif t < 96: t = t * 0.8 + 19.2 # Second half, shorter
# Third half is normal
return mesure.time + ((time - mesure.time) // 144) * 144 + int(t)
else: # Ternary syncope
t = (time - mesure.time) % 96
if t < 48: t = t * 1.333333333 # First half, longer
else: t = t * 0.666666666 + 32 # Second half, shorter
return mesure.time + ((time - mesure.time) // 96) * 96 + int(t)
class TooManyChannelError(model.SongwriteError): pass
class MidiBaseChannel(object): # A midi channel, for internal use
def __init__(self, midi, id):
if id >= 16: raise TooManyChannelError
self.midi = midi
self.special_id = self.id = id
def set_init_events(self, init_events):
self.init_events = init_events
self.midi.events.extend(init_events)
def __int__(self): return self.id
class MidiChannel(MidiBaseChannel): # A normal midi channel, for internal use
def __init__(self, midi):
MidiBaseChannel.__init__(self, midi, midi.next_channel_id)
midi.next_channel_id += 1
if midi.next_channel_id == 9: # Channel 9 is reserved for Drums !
midi.next_channel_id += 1
def fork_for_special_notes(self):
self.special_id = self.midi.next_channel_id
if self.special_id >= 16: raise TooManyChannelError
self.midi.next_channel_id += 1
self.midi.events.extend(map( # Transpose the initing events so it apply to the new channel -- the special channel must be initialized as the normal was !
lambda data: (data[0], data[1], chr(ord(data[2][0]) - self.id + self.special_id) + data[2][1:]),
self.init_events,
))
class Midi(object): # A midifier, for internal use
def __init__(self, rich_midi_tablature = 0):
self.next_channel_id = 0
self.events = []
self.drums_channel = MidiBaseChannel(self, 9) # Play drums on channel 9 (10 if we start counting at 1)
self.rich_midi_tablature = rich_midi_tablature
self.partition_2_channel = {}
def data(self, mesures, playlist = None, trackable = 0):
self.events.sort()
lasttime = 0
events2 = []
time_factor = 1.0
old_tempo = mesures[0].tempo
real_time = 0
if playlist and playlist.playlist_items:
events1 = []
mesure2events = dict(map(lambda mesure: (mesure, []), mesures))
for time_event in self.events:
# Before event is a Midi meta-event that be stay JUST BEFORE event (this is for the Rich Tablature Midi Format)
if len(time_event) == 3:
time, mesure, event = time_event
source = None
else: time, mesure, event, source = time_event
if mesure is None:
events2.append(varLength(0) + event)
continue
if time < 0: time = 0
if mesure.syncope: time = apply_syncope(mesure, time)
mesure2events[mesure].append((time, event, source))
lasttime = time
mesuretime = 0
lasttime = 0
for item in playlist.playlist_items:
for mesure in mesures[item.from_mesure : item.to_mesure + 1]:
if mesure.tempo != old_tempo:
time_factor = time_factor * old_tempo / mesure.tempo
old_tempo = mesure.tempo
for time_event in mesure2events[mesure]:
time2, event, source = time_event
time = time2 - mesure.time + mesuretime
delta_time = (time - lasttime) * time_factor
real_time += delta_time
if self.rich_midi_tablature and source: # Add the rich midi tablature note event JUST BEFORE the event
if isinstance(source, model.Partition): rich_midi_event = partition_2_rich_midi_events(source, self)
else: rich_midi_event = note_2_rich_midi_events(source)
if rich_midi_event: events1.append((real_time, rich_midi_event))
events1.append((real_time, event))
if trackable and isinstance(source, model.Note):
if 144 <= ord(event[0]) < 160:
label = str(int(source.time))
events1.append((real_time, struct.pack(">BB", 0xFF, 0x05) + varLength(1+len(label)) + label + "\n"))
lasttime = time
mesuretime += mesure.duration
events1.sort()
lasttime = time
for time, event in events1:
events2.append(varLength(int(time - lasttime)) + event)
lasttime = time
else:
for time_event in self.events:
# Before event is a Midi meta-event that be stay JUST BEFORE event (this is for the Rich Tablature Midi Format)
if len(time_event) == 3:
time, mesure, event = time_event
source = None
else: time, mesure, event, source = time_event
if time < 0: time = 0
if mesure:
if mesure.syncope: time = apply_syncope(mesure, time)
if mesure.tempo != old_tempo:
time_factor = time_factor * old_tempo / mesure.tempo
old_tempo = mesure.tempo
delta_time = (time - lasttime) * time_factor
real_time += delta_time
if self.rich_midi_tablature and source: # Add the rich midi tablature note event JUST BEFORE the event
if isinstance(source, model.Partition): rich_midi_event = partition_2_rich_midi_events(source, self)
else: rich_midi_event = note_2_rich_midi_events(source)
if rich_midi_event:
events2.append(varLength(int(delta_time)) + rich_midi_event)
lasttime = time
delta_time = 0
events2.append(varLength(int(delta_time)) + event)
if trackable and isinstance(source, model.Note):
label = str(int(source.time))
events2.append(varLength(0) + struct.pack(">BB", 0xFF, 0x05) + varLength(1+len(label)) + label + "\n")
lasttime = time
if trackable:
events2.append(varLength(0) + struct.pack(">BB", 0xFF, 0x05) + varLength(3) + "-1\n")
events2.append(varLength(0) + END_TRACK)
return chunk("MThd", struct.pack(">hhh", 0, 1, mesures[0].tempo)) + chunk("MTrk", "".join(events2))
def song_2_midi(self, start_time = 0, end_time = sys.maxint, rich_midi_tablature = 0, trackable = 0):
midi = Midi(rich_midi_tablature)
for partition in self.partitions:
if isinstance(partition, model.Partition):
#delta = getattr(partition, "capo", 0)
delta = 0
for note in partition.notes:
note._real_value = note.value + delta
for partition in self.partitions:
if isinstance(partition, model.Partition):
partition_2_midi(partition, midi, start_time, end_time)
if start_time != 0:
return midi.data(self.mesures, (), trackable)
else:
return midi.data(self.mesures, self.playlist, trackable)
ME_SYSEX_GS_LSB
def partition_2_midi(self, midi, start_time, end_time):
if not self.muted:
if self.instrument == 128: # 128 means Drums
channel = midi.partition_2_channel[self] = midi.drums_channel
channel.set_init_events((
(-1, None, struct.pack(">BBB", 0xB0 + channel.id, 0x5B, self.reverb )), # Reverb
(-1, None, struct.pack(">BBB", 0xB0 + channel.id, 0x5D, self.chorus )), # Chorus
(-1, None, struct.pack(">BBB", 0xB0 + channel.id, 0x07, self.volume / 2)), # Volume
))
else:
channel = midi.partition_2_channel[self] = MidiChannel(midi)
channel.set_init_events((
(-1, None, struct.pack(">BB" , 0xC0 + channel.id, self.instrument), self), # Instrument selection
(-1, None, struct.pack(">BBB", 0xB0 + channel.id, 0x5B, self.reverb )), # Reverb
(-1, None, struct.pack(">BBB", 0xB0 + channel.id, 0x5D, self.chorus )), # Chorus
(-1, None, struct.pack(">BBB", 0xB0 + channel.id, 0x07, self.volume / 2)), # Volume
))
# Check if some "special notes" (hammer, ...) are played at the same time that normal notes, and if so, play them on a different channel.
fx_notes = filter(lambda note: note.fx or note.link_fx, self.notes)
if fx_notes and not midi.rich_midi_tablature:
# We must ALWAYS fork since we don't know when a note really ends...
channel.fork_for_special_notes()
mesure = self.song.mesures[0]
mesure_id = 0
if midi.rich_midi_tablature: note_2_events = note_2_midi_events_without_special_effect
else: note_2_events = note_2_midi_events
for note in self.notes:
while note.time >= mesure.end_time():
mesure_id += 1
mesure = self.song.mesures[mesure_id]
midi.events.extend(note_2_events(note, channel, mesure, start_time, end_time))
def partition_2_rich_midi_events(self, midi):
if not hasattr(self.view, "strings"): return None
channel = midi.partition_2_channel[self]
return "\xff\x10%s%s%s%s" % (struct.pack(">B", len(self.view.strings) + 2),
struct.pack(">B", channel.id + 1),
struct.pack(">B", getattr(self, "capo", 0)),
"".join(map(lambda string: struct.pack(">B", string.base_note), self.view.strings)))
def note_2_midi_events_without_special_effect(self, channel, mesure, start_time, end_time):
if start_time <= self.time <= end_time:
return (
(self.time - start_time , mesure, struct.pack(">BBB", 0x90 + channel.id, self._real_value, self.volume), self),
(self.time - start_time + self.duration, mesure, struct.pack(">BBB", 0x80 + channel.id, self._real_value, self.volume)),
)
return ()
def note_2_midi_events(self, channel, mesure, start_time, end_time):
if start_time <= self.time <= end_time:
if self.link_fx:
func = globals().get("_note_2_midi_events_%s" % self.link_fx)
if func: return func(self, channel, mesure, start_time, end_time)
elif self.fx:
func = globals().get("_note_2_midi_events_%s" % self.fx)
if func: return func(self, channel, mesure, start_time, end_time)
if self.linked_from: return ()
real_time = self.real_time()
if getattr(self.partition, "let_ring", 0):
next = self.next()
if next: duration = min(next.time - self.time, 384)
else: duration = 384
else: duration = self.duration
return (
(real_time - start_time , mesure, struct.pack(">BBB", 0x90 + channel.id, self._real_value, self.volume), self),
(real_time - start_time + duration, mesure, struct.pack(">BBB", 0x80 + channel.id, self._real_value, self.volume)),
)
return ()
def _note_2_midi_events_link(self, channel, mesure, start_time, end_time):
real_time = self.real_time()
first_value = self.link_first_real_value()
_min, _max = self.link_min_max_real_values()
delta = max(first_value - _min, _max - first_value)
midi_events = [] # Here we'll use the "special ID" channel, and not the channel normal ID, to avoid to change other notes played in parallel on the normal channel
duration = self.link_duration()
if getattr(self.partition, "let_ring", 0):
next = self.next()
while next and next.time < self.time + duration:
next = next.next()
if next: duration = min(next.time - self.time, 384)
else: duration = 384
if not self.linked_from:
if delta:
midi_set_pitch_bend_delta(midi_events, real_time - start_time, mesure, channel.special_id, delta)
if self.fx == u"harmonic":
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value - 12, self.volume), self))
midi_events.append((real_time - start_time + duration, mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value - 12, self.volume)))
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, int(63.0 + 63.0 * 12.0 / delta)))) # Reset initial pitch bend
else:
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value, self.volume), self))
midi_events.append((real_time - start_time + duration, mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value, self.volume)))
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 63))) # Reset initial pitch bend
midi_events.append((real_time - start_time + duration - 1, mesure, struct.pack(">BBB", 0xB0 + channel.special_id, 0x7B, 127))) # Stop all sound on the special channel, because we are going to modify the pitch bend !
if delta:
if self.linked_to.fx == u"harmonic":
midi_events.append((self.linked_to.real_time() - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, int(63.0 + 63.0 * (self.linked_to._real_value + 12.0 - self.link_first_real_value()) / delta)))) # Pitch bend
else:
midi_events.append((self.linked_to.real_time() - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, int(63.0 + 63.0 * (self.linked_to._real_value - self.link_first_real_value()) / delta)))) # Pitch bend
return tuple(midi_events)
def _note_2_midi_events_slide(self, channel, mesure, start_time, end_time):
real_time = self.real_time()
first_value = self.link_first_real_value()
_min, _max = self.link_min_max_real_values()
delta = max(first_value - _min, _max - first_value)
midi_events = [] # Here we'll use the "special ID" channel, and not the channel normal ID, to avoid to change other notes played in parallel on the normal channel
if not self.linked_from:
if delta:
midi_set_pitch_bend_delta(midi_events, real_time - start_time, mesure, channel.special_id, delta)
midi_events.append((real_time - start_time , mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value, self.volume), self))
midi_events.append((real_time - start_time + self.link_duration(), mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value, self.volume)))
midi_events.append((real_time - start_time , mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 63))) # Reset initial pitch bend
delta_time = self.linked_to.real_time() - real_time
delta_value = self.linked_to._real_value - self.link_first_real_value()
for i in xrange(1, 11):
value = (i / 10.0) * self.linked_to._real_value + ((10 - i) / 10.0) * self._real_value
f = i / 10.0
midi_events.append((real_time + int(f * delta_time) - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, int(63.0 + 63.0 * (value - self.link_first_real_value()) / delta)))) # Pitch bend
return tuple(midi_events)
def _note_2_midi_events_bend(self, channel, mesure, start_time, end_time):
real_time = self.real_time()
midi_events = [] # Here we'll use the "special ID" channel, and not the channel normal ID, to avoid to change other notes played in parallel on the normal channel
midi_events.append((real_time - start_time , mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value, self.volume), self))
midi_events.append((real_time - start_time + self.link_duration(), mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value, self.volume)))
midi_events.append((real_time - start_time , mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 63))) # Reset initial pitch bend
delta_time = self.duration
delta_value = 2.0 * self.bend_pitch
for i in xrange(10):
f = i / 10.0
midi_events.append((real_time + int(f * delta_time) - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, int(31.5 * (f * delta_value + 2))))) # Pitch bend
return tuple(midi_events)
def _note_2_midi_events_tremolo(self, channel, mesure, start_time, end_time):
real_time = self.real_time()
midi_events = [] # Here we'll use the "special ID" channel, and not the channel normal ID, to avoid to change other notes played in parallel on the normal channel
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value, self.volume), self))
midi_events.append((real_time - start_time + self.link_duration(), mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value, self.volume)))
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 63))) # Reset initial pitch bend
val = 0.0
for time in xrange(int(real_time - start_time), int(real_time - start_time + self.duration), 2):
midi_events.append((time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, int(31.5 * (math.sin(val) * 0.3 + 2))))) # Pitch bend
val += 0.3
return tuple(midi_events)
def _note_2_midi_events_dead(self, channel, mesure, start_time, end_time):
real_time = self.real_time()
midi_events = [] # Here we'll use the "special ID" channel, and not the channel normal ID, to avoid to change other notes played in parallel on the normal channel
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value, self.volume), self))
midi_events.append((real_time - start_time + self.link_duration(), mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value, self.volume)))
midi_events.append((real_time - start_time, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 63))) # Reset initial pitch bend
midi_events.append((real_time - start_time + 16, mesure, struct.pack(">BBB", 0xB0 + channel.special_id, 120, 0))) # Stop all sounds
return tuple(midi_events)
def _note_2_midi_events_harmonic(self, channel, mesure, start_time, end_time):
if self.linked_from: return ()
real_time = self.real_time()
if getattr(self.partition, "let_ring", 0):
next = self.next()
if next: duration = min(next.time - self.time, 384)
else: duration = 384
else: duration = self.duration
midi_events = [] # Here we'll use the "special ID" channel, and not the channel normal ID, to avoid to change other notes played in parallel on the normal channel
midi_set_pitch_bend_delta(midi_events, real_time - start_time, mesure, channel.special_id, 12)
midi_events.append((real_time - start_time , mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 127)))
midi_events.append((real_time - start_time + duration, mesure, struct.pack(">BBB", 0xE0 + channel.special_id, 63, 63))) # Reset pitch bend
midi_events.append((real_time - start_time , mesure, struct.pack(">BBB", 0x90 + channel.special_id, self._real_value - 12, self.volume), self))
midi_events.append((real_time - start_time + duration, mesure, struct.pack(">BBB", 0x80 + channel.special_id, self._real_value - 12, self.volume)))
return tuple(midi_events)
def midi_set_pitch_bend_delta(midi_events, time, mesure, channel_id, delta):
if time >= 1:
midi_events.append((time - 1, mesure, struct.pack(">BBB", 0xB0 + channel_id, 0x7B, 120))) # Stop all sound on the special channel, because we are going to modify the pitch bend !
midi_events.append ((time , mesure, struct.pack(">BBB", 0xB0 + channel_id, 0x64, 0x00)))
midi_events.append ((time , mesure, struct.pack(">BBB", 0xB0 + channel_id, 0x65, 0x00)))
midi_events.append ((time , mesure, struct.pack(">BBB", 0xB0 + channel_id, 0x06, delta)))
def note_2_rich_midi_events(self):
if not hasattr(self, "string_id"): return None
if self.fx: return globals()["_note_2_rich_midi_events_%s" % self.fx](self)
return "\xff\x11\x01%s" % struct.pack(">b", self.string_id)
def _note_2_rich_midi_events_link(self):
dif = cmp(self._real_value, self.linked_to._real_value)
if dif < 0: return "\xff\x11\x02%s\x01" % struct.pack(">b", self.string_id)
elif dif > 0: return "\xff\x11\x02%s\x02" % struct.pack(">b", self.string_id)
else: return "\xff\x11\x02%s\x01" % struct.pack(">b", self.string_id) # Not supported by Rich Tablature Midi ???
def _note_2_rich_midi_events_slide(self):
if self._real_value < self.linked_to._real_value: return "\xff\x11\x02%s\x03" % struct.pack(">b", self.string_id)
else: return "\xff\x11\x02%s\x04" % struct.pack(">b", self.string_id)
def _note_2_rich_midi_events_bend(self):
return "\xff\x11\x03%s\x0C%s" % (struct.pack(">b", self.string_id), struct.pack(">b", int(round(self.bend_pitch / 0.25))))
def _note_2_rich_midi_events_tremolo(self):
return "\xff\x11\x02%s\x0A" % struct.pack(">b", self.string_id)
def _note_2_rich_midi_events_dead(self):
return "\xff\x11\x02%s\x0E" % struct.pack(">b", self.string_id)
def _note_2_rich_midi_events_roll(self):
notes = self.chord_notes()
if (not notes) or (self._real_value is min([note._real_value for note in notes])):
return "\xff\x11\x02%s\x06" % struct.pack(">b", self.string_id)
else:
return "\xff\x11\x01" + struct.pack(">b", self.string_id) # Same as normal notes
def _note_2_rich_midi_events_harmonic(self):
return "\xff\x11\x02%s\x07" % struct.pack(">b", self.string_id)
def chunk(name, data): return struct.pack(">4si", name, len(data)) + data
def varLength(i):
array = [i & 0x7F]
while i >= 128:
i = i >> 7
array.append((i & 0x7F) | 0x80)
array.reverse()
return struct.pack(">" + "B" * len(array), *array)
def readVarLength(file):
result = 0
while 1:
b = struct.unpack(">B", file.read(1))[0]
result = result | (b & 0x7F)
if (b & 0x80) != 0x80: break
result = result << 7
return result
END_TRACK = "\xff\x2f\x00"