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"""
MIDI input package
provides a dock which allows to capture midi events and insert notes
- input is static, not dynamic
- special midi events (e. g. damper pedal) can modify notes (e. g. duration)
or insert elements (e. g. slurs)
current limitations:
- special events not implemented yet
TODO:
dynamic input
"""
import time
import weakref
from PyQt5.QtCore import QObject, QSettings, QThread, pyqtSignal
import midihub
import midifile.event
import midifile.parser
import documentinfo
from . import elements
class MidiIn(object):
def __init__(self, widget):
self._widget = weakref.ref(widget)
self._portmidiinput = None
self._listener = None
self._chord = None
def __del__(self):
if isinstance(self._listener, Listener):
self.capturestop()
def widget(self):
return self._widget()
def open(self):
s = QSettings()
self._portname = s.value("midi/midi/input_port", midihub.default_input(), str)
self._pollingtime = s.value("midi/polling_time", 10, int)
self._portmidiinput = midihub.input_by_name(self._portname)
self._listener = Listener(self._portmidiinput, self._pollingtime)
self._listener.NoteEventSignal.connect(self.analyzeevent)
def close(self):
# self._portmidiinput.close()
# this will end in segfault with pyportmidi 0.0.7 in ubuntu
# see https://groups.google.com/d/msg/pygame-mirror-on-google-groups/UA16GbFsUDE/RkYxb9SzZFwJ
# so we cleanup ourself and invoke __dealloc__() by garbage collection
# so discard any reference to a pypm.Input instance
if self._portmidiinput:
self._portmidiinput._input = None
self._portmidiinput = None
self._listener = None
def capture(self):
if not self._portmidiinput:
self.open()
if not self._portmidiinput:
return
doc = self.widget().mainwindow().currentDocument()
self._language = documentinfo.docinfo(doc).language() or 'nederlands'
self._activenotes = 0
self._listener.start()
def capturestop(self):
self._listener.stop()
if not self._listener.isFinished():
self._listener.wait()
self._activenotes = 0
self.close()
def analyzeevent(self, event):
if isinstance(event, midifile.event.NoteEvent):
self.noteevent(event.type, event.channel, event.note, event.value)
def noteevent(self, notetype, channel, notenumber, value):
targetchannel = self.widget().channel()
if channel == targetchannel or targetchannel == 0: # '0' captures all
if notetype == 9 and value > 0: # note on with velocity > 0
notemapping = elements.NoteMapping(self.widget().keysignature(), self.widget().accidentals()=='sharps')
note = elements.Note(notenumber, notemapping)
if self.widget().chordmode():
if not self._chord: # no Chord instance?
self._chord = elements.Chord()
self._chord.add(note)
self._activenotes += 1
else:
self.printwithspace(note.output(self.widget().relativemode(), self._language))
elif (notetype == 8 or (notetype == 9 and value == 0)) and self.widget().chordmode():
self._activenotes -= 1
if self._activenotes <= 0: # activenotes could get negative under strange conditions
if self._chord:
self.printwithspace(self._chord.output(self.widget().relativemode(), self._language))
self._activenotes = 0 # reset in case it was negative
self._chord = None
def printwithspace(self, text):
cursor = self.widget().mainwindow().textCursor()
# check if there is a space before cursor or beginning of line
posinblock = cursor.position() - cursor.block().position()
charbeforecursor = cursor.block().text()[posinblock-1:posinblock]
if charbeforecursor.isspace() or cursor.atBlockStart():
cursor.insertText(text)
else:
cursor.insertText(' ' + text)
class Listener(QThread):
NoteEventSignal = pyqtSignal(midifile.event.NoteEvent)
def __init__(self, portmidiinput, pollingtime):
QThread.__init__(self)
self._portmidiinput = portmidiinput
self._pollingtime = pollingtime
def run(self):
self._capturing = True
while self._capturing:
while not self._portmidiinput.poll():
time.sleep(self._pollingtime/1000.)
if not self._capturing:
break
if not self._capturing:
break
data = self._portmidiinput.read(1)
# midifile.parser.parse_midi_events is a generator which expects a long "byte string" from a file,
# so we feed it one. But since it's just one event, we only need the first "generated" element.
# First byte is time, which is unnecessary in our case, so we feed a dummy byte 77
# and strip output by just using [1]. 77 is chosen randomly ;)
s = bytearray([77, data[0][0][0], data[0][0][1], data[0][0][2], data[0][0][3]])
event = next(midifile.parser.parse_midi_events(s))[1]
if isinstance(event,midifile.event.NoteEvent):
self.NoteEventSignal.emit(event)
def stop(self):
self._capturing = False
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