forked from platypush/platypush
128 lines
3.9 KiB
Python
128 lines
3.9 KiB
Python
import time
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from platypush.plugins import Plugin, action
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class MidiPlugin(Plugin):
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"""
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Virtual MIDI controller plugin. It allows you to send custom MIDI messages
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to any connected devices.
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Requires:
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* **python-rtmidi** (``pip install python-rtmidi``)
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"""
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_played_notes = set()
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def __init__(self, device_name='Platypush virtual MIDI output', **kwargs):
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"""
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:param device_name: MIDI virtual device name (default: *Platypush virtual MIDI output*)
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:type device_name: str
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"""
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import rtmidi
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super().__init__(**kwargs)
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self.device_name = device_name
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self.midiout = rtmidi.MidiOut()
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available_ports = self.midiout.get_ports()
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if available_ports:
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self.midiout.open_port(0)
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self.logger.info('Initialized MIDI plugin on port 0')
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else:
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self.midiout.open_virtual_port(self.device_name)
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self.logger.info('Initialized MIDI plugin on virtual device {}'.format(self.device_name))
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@action
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def send_message(self, values):
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"""
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:param values: Values is expected to be a list containing the MIDI command code and the command parameters -
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see reference at https://ccrma.stanford.edu/~craig/articles/linuxmidi/misc/essenmidi.html
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:type values: list[int]
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Available MIDI commands:
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* ``0x80`` Note Off
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* ``0x90`` Note On
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* ``0xA0`` Aftertouch
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* ``0xB0`` Continuous controller
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* ``0xC0`` Patch change
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* ``0xD0`` Channel Pressure
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* ``0xE0`` Pitch bend
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* ``0xF0`` Start of system exclusive message
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* ``0xF1`` MIDI Time Code Quarter Frame (Sys Common)
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* ``0xF2`` Song Position Pointer (Sys Common)
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* ``0xF3`` Song Select
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* ``0xF6`` Tune Request (Sys Common)
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* ``0xF7`` End of system exclusive message
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* ``0xF8`` Timing Clock (Sys Realtime)
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* ``0xFA`` Start (Sys Realtime)
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* ``0xFB`` Continue (Sys Realtime)
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* ``0xFC`` Stop (Sys Realtime)
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* ``0xFE`` Active Sensing (Sys Realtime)
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* ``0xFF`` System Reset (Sys Realtime)
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"""
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self.midiout.send_message(values)
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@action
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def play_note(self, note, velocity, duration=0):
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"""
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Play a note with selected velocity and duration.
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:param note: MIDI note in range 0-127 with #60 = C4
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:type note: int
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:param velocity: MIDI note velocity in range 0-127
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:type velocity: int
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:param duration: Note duration in seconds. Pass 0 if you don't want the note to get off
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:type duration: float
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"""
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self.send_message([0x90, note, velocity]) # Note on
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self._played_notes.add(note)
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if duration:
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time.sleep(duration)
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self.send_message([0x80, note, 0]) # Note off
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self._played_notes.remove(note)
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@action
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def release_note(self, note):
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"""
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Release a played note.
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:param note: MIDI note in range 0-127 with #60 = C4
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:type note: int
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"""
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self.send_message([0x80, note, 0]) # Note off
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self._played_notes.remove(note)
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@action
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def release_all_notes(self):
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"""
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Release all the notes being played.
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"""
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played_notes = self._played_notes.copy()
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for note in played_notes:
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self.release_note(note)
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@action
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def query_ports(self):
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"""
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:returns: dict: A list of the available MIDI ports with index and name
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"""
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import rtmidi
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in_ports = rtmidi.MidiIn().get_ports()
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out_ports = rtmidi.MidiOut().get_ports()
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return {
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'in': {i: port for i, port in enumerate(in_ports)},
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'out': {i: port for i, port in enumerate(out_ports)},
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}
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# vim:sw=4:ts=4:et:
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