expyriment.io.extras.MidiOut

class expyriment.io.extras.MidiOut(device, latency=None, buffer_size=None)

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.

Methods

__init__(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

abort()

Terminates outgoing messages immediately.

buffer_size

Getter for buffer_size.

close(abort=False)

Close the MIDI interface.

Parameters :

abort : bool, optional

abort messages in the buffer (default=True)

static get_devices()

Get a list of all MIDI output devices connected to the system.

id

Getter for id.

latency

Getter for latency.

select_instrument(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)

send(event_list)

Send a list of MIDI events.

Each event should have the following format:

[status, data1, data2, data3], timestamp]

Parameters :

event_list : list

list of events to send

Notes

The data fields are optional.

send_note_off(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)

send_note_on(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)

send_short(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

send_sysex(timestamp, message)

Send a System Exlusive message.

Parameters :

timestamp : int

when (in ms) to send the message

message : sit or list

message to send