From 27b97e584f835571378fd0ab3a6c051dd3020856 Mon Sep 17 00:00:00 2001 From: Fabio Manganiello Date: Wed, 23 May 2018 19:49:54 +0200 Subject: [PATCH] Added support for MIDI real-time events --- platypush/plugins/midi.py | 95 +++++++++++++++++++++++++++++++++++++++ setup.py | 1 + 2 files changed, 96 insertions(+) create mode 100644 platypush/plugins/midi.py diff --git a/platypush/plugins/midi.py b/platypush/plugins/midi.py new file mode 100644 index 00000000..9c84c437 --- /dev/null +++ b/platypush/plugins/midi.py @@ -0,0 +1,95 @@ +import logging +import rtmidi +import time + +from platypush.message.response import Response +from platypush.plugins import Plugin + + +class MidiPlugin(Plugin): + """ + Virtual MIDI controller plugin. + It requires python-rtmidi - https://pypi.org/project/python-rtmidi/ + """ + + _played_notes = set() + + def __init__(self, device_name='Platypush virtual MIDI output', + *args, **kwargs): + 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) + logging.info('Initialized MIDI plugin on port 0') + else: + self.open_virtual_port(self.device_name) + logging.info('Initialized MIDI plugin on virtual device {}'. + format(self.device_name)) + + + def send_message(self, values, *args, **kwargs): + """ + 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 + + Available MIDI commands: + 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) + """ + + self.midiout.send_message(values, *args, **kwargs) + return Response(output={'status':'ok'}) + + + def play_note(self, note, velocity, duration=0): + """ + Params: + - note: MIDI note in range 0-127 with #60 = C4 + - velocity: MIDI note velocity in range 0-127 + - duration: Note duration in (float) seconds. Pass 0 if you don't + want the note to get off + """ + + 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) + + + def release_note(self, note): + self.send_message([0x80, note, 0]) # Note off + self._played_notes.remove(note) + + + def release_all_notes(self): + played_notes = self._played_notes.copy() + for note in played_notes: + self.release_note(note) + +# vim:sw=4:ts=4:et: + diff --git a/setup.py b/setup.py index 264cd3d4..9a79bfc4 100755 --- a/setup.py +++ b/setup.py @@ -81,6 +81,7 @@ setup( 'Support for most of the HTTP poll backends': ['python-dateutil'], 'Support for Last.FM scrobbler plugin': ['pylast'], 'Support for custom hotword detection': ['snowboy'], + 'Support for real-time MIDI events': ['rtmidi'], 'Support for GPIO pins access': ['RPi.GPIO'], 'Support for MCP3008 analog-to-digital converter plugin': ['adafruit-mcp3008'], # 'Support for Leap Motion backend': ['git+ssh://git@github.com:BlackLight/leap-sdk-python3.git', 'redis'],