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"""MIDI output.
This module contains a class implementing a MIDI output device.
"""
__author__ = 'Florian Krause <florian@expyriment.org>, \
Oliver Lindemann <oliver@expyriment.org>'
__version__ = '0.7.0'
__revision__ = '55a4e7e'
__date__ = 'Wed Mar 26 14:33:37 2014 +0100'
import _midiout_defaults as defaults
import expyriment
from expyriment.io._input_output import Output
try:
from pygame import midi as _midi
_midi.init()
except:
_midi = None
class MidiOut(Output):
"""A class implementing a MIDI output.
**EXPERIMENTAL!**
Due to a bug in Pygame's midi module, closing a MidiOut (or the programme)
will cause an error message. Until this is fixed in Pygame, MidiOut will
stay in extras.
"""
@staticmethod
def get_devices():
"""Get a list of all MIDI output devices connected to the system."""
if _midi is None:
return
outdevices = []
all_ids = _midi.get_count()
for device_id in all_ids:
info = _midi.get_device_info(device_id)
if info[3] == 1:
outdevices.add([device_id, info[1]])
return outdevices
def __init__(self, device, latency=None, buffer_size=None):
"""Create a MIDI output.
Parameters
----------
device : int or str
id or name of the MIDI device
latency : int, optional
delay in ms applied to timestamp
buffer_size : int, optional
number of events to be buffered
"""
import types
if type(_midi) is not types.ModuleType:
raise ImportError("""Sorry, MIDI output is not supported on this computer.""")
if not expyriment._active_exp.is_initialized:
raise RuntimeError(
"Cannot create MidiOut before expyriment.initialize()!")
_midi.init()
Output.__init__(self)
self._id = device
if buffer_size is None:
buffer_size = defaults.midiout_buffer_size
self._buffer_size = buffer_size
if latency is None:
latency = defaults.midiout_latency
self._latency = latency
self.output = _midi.Output(device, latency, buffer_size)
@property
def id(self):
"""Getter for id."""
return self._id
@property
def buffer_size(self):
"""Getter for buffer_size."""
return self._buffer_size
@property
def latency(self):
"""Getter for latency."""
return self._latency
def close(self, abort=False):
"""Close the MIDI interface.
Parameters
----------
abort : bool, optional
abort messages in the buffer (default=True)
"""
if abort:
self.output.abort()
self.output.close()
def abort(self):
"""Terminates outgoing messages immediately."""
self.output.abort()
def send(self, event_list):
"""Send a list of MIDI events.
Each event should have the following format:
[status, data1, data2, data3], timestamp]
Notes
-----
The data fields are optional.
Parameters
----------
event_list : list
list of events to send
"""
self.output.write(event_list)
def send_short(self, status, data1=0, data2=0):
"""Send MIDI events of 3 bytes or less.
Parameters
----------
status : int
status of the event to send
data1 : int, optional
data1 of the event to send
data2 : int, optional
data2 of the event to send
"""
self.output.write_short(status, data1, data2)
def send_sysex(self, timestamp, message):
"""Send a System Exlusive message.
Parameters
----------
timestamp : int
when (in ms) to send the message
message : sit or list
message to send
"""
self.output.wirte_sys_ex(timestamp, message)
def select_instrument(self, instrument_id, channel=0):
"""Select an instrument.
Parameters
----------
instrument_id : int
id (0-127) of the instrument
channel : int, optional
MIDI channel for the instrument (default=0)
"""
self.output.set_instrument(instrument_id, channel)
def send_note_on(self, note, velocity=None, channel=0):
"""Send a note-on event.
Parameters
----------
note : int
note value
velocity : int, optional
velocity of the note
channel : int, optional
MIDI channel of the note (default=0)
"""
self.output.note_on(note, velocity, channel)
def send_note_off(self, note, velocity=None, channel=0):
"""Send a note-off event.
Parameters
----------
note : int
note value
velocity : int, optional
velocity of the note
channel : int, optional
MIDI channel of the note (default=0)
"""
self.output.note_off(note, velocity, channel)
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