godot/core/os/midi_driver.cpp

/*************************************************************************/
/*  midi_driver.cpp                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "midi_driver.h"

#include "core/os/os.h"
#include "main/input_default.h"

MIDIDriver *MIDIDriver::singleton = NULL;
MIDIDriver *MIDIDriver::get_singleton() {

	return singleton;
}

void MIDIDriver::set_singleton() {

	singleton = this;
}

void MIDIDriver::receive_input_packet(uint64_t timestamp, uint8_t *data, uint32_t length) {

	Ref<InputEventMIDI> event;
	event.instance();

	if (length >= 1) {
		event->set_channel(data[0] & 0xF);
		event->set_message(data[0] >> 4);
	}

	switch (event->get_message()) {
		case MIDI_MESSAGE_AFTERTOUCH:
			if (length >= 3) {
				event->set_pitch(data[1]);
				event->set_pressure(data[2]);
			}
			break;

		case MIDI_MESSAGE_CONTROL_CHANGE:
			if (length >= 3) {
				event->set_controller_number(data[1]);
				event->set_controller_value(data[2]);
			}
			break;

		case MIDI_MESSAGE_NOTE_ON:
		case MIDI_MESSAGE_NOTE_OFF:
		case MIDI_MESSAGE_PITCH_BEND:
			if (length >= 3) {
				event->set_pitch(data[1]);
				event->set_velocity(data[2]);

				if (event->get_message() == MIDI_MESSAGE_NOTE_ON && event->get_velocity() == 0) {
					// https://www.midi.org/forum/228-writing-midi-software-send-note-off,-or-zero-velocity-note-on
					event->set_message(MIDI_MESSAGE_NOTE_OFF);
				}
			}
			break;

		case MIDI_MESSAGE_PROGRAM_CHANGE:
			if (length >= 2) {
				event->set_instrument(data[1]);
			}
			break;

		case MIDI_MESSAGE_CHANNEL_PRESSURE:
			if (length >= 2) {
				event->set_pressure(data[1]);
			}
			break;
	}

	InputDefault *id = Object::cast_to<InputDefault>(Input::get_singleton());
	id->parse_input_event(event);
}

PoolStringArray MIDIDriver::get_connected_inputs() {

	PoolStringArray list;
	return list;
}

MIDIDriver::MIDIDriver() {

	set_singleton();
}