platypush/platypush/plugins/midi.py

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import rtmidi
import time
from platypush.plugins import Plugin, action
class MidiPlugin(Plugin):
"""
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Virtual MIDI controller plugin. It allows you to send custom MIDI messages
to any connected devices.
Requires:
* **python-rtmidi** (``pip install python-rtmidi``)
"""
_played_notes = set()
def __init__(self, device_name='Platypush virtual MIDI output',
*args, **kwargs):
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"""
:param device_name: MIDI virtual device name (default: *Platypush virtual MIDI output*)
:type device_name: str
"""
super().__init__(*args, **kwargs)
self.device_name = device_name
self.midiout = rtmidi.MidiOut()
available_ports = self.midiout.get_ports()
if available_ports:
self.midiout.open_port(0)
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self.logger.info('Initialized MIDI plugin on port 0')
else:
self.open_virtual_port(self.device_name)
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self.logger.info('Initialized MIDI plugin on virtual device {}'.
format(self.device_name))
@action
def send_message(self, values, *args, **kwargs):
"""
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:param values: Values is expected to be a list containing the MIDI command code and the command parameters - see reference at https://ccrma.stanford.edu/~craig/articles/linuxmidi/misc/essenmidi.html
:type values: list[int]
Available MIDI commands:
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* ``0x80`` Note Off
* ``0x90`` Note On
* ``0xA0`` Aftertouch
* ``0xB0`` Continuous controller
* ``0xC0`` Patch change
* ``0xD0`` Channel Pressure
* ``0xE0`` Pitch bend
* ``0xF0`` Start of system exclusive message
* ``0xF1`` MIDI Time Code Quarter Frame (Sys Common)
* ``0xF2`` Song Position Pointer (Sys Common)
* ``0xF3`` Song Select
* ``0xF6`` Tune Request (Sys Common)
* ``0xF7`` End of system exclusive message
* ``0xF8`` Timing Clock (Sys Realtime)
* ``0xFA`` Start (Sys Realtime)
* ``0xFB`` Continue (Sys Realtime)
* ``0xFC`` Stop (Sys Realtime)
* ``0xFE`` Active Sensing (Sys Realtime)
* ``0xFF`` System Reset (Sys Realtime)
:param args: Extra args that will be passed to ``rtmidi.send_message``
:param kwargs: Extra kwargs that will be passed to ``rtmidi.send_message``
"""
self.midiout.send_message(values, *args, **kwargs)
@action
def play_note(self, note, velocity, duration=0):
"""
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Play a note with selected velocity and duration.
:param note: MIDI note in range 0-127 with #60 = C4
:type note: int
:param velocity: MIDI note velocity in range 0-127
:type velocity: int
:param duration: Note duration in seconds. Pass 0 if you don't want the note to get off
:type duration: float
"""
self.send_message([0x90, note, velocity]) # Note on
self._played_notes.add(note)
if duration:
time.sleep(duration)
self.send_message([0x80, note, 0]) # Note off
self._played_notes.remove(note)
@action
def release_note(self, note):
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"""
Release a played note.
:param note: MIDI note in range 0-127 with #60 = C4
:type note: int
"""
self.send_message([0x80, note, 0]) # Note off
self._played_notes.remove(note)
@action
def release_all_notes(self):
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"""
Release all the notes being played.
"""
played_notes = self._played_notes.copy()
for note in played_notes:
self.release_note(note)
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