godot/drivers/winmidi/midi_driver_winmidi.cpp

/*************************************************************************/
/*  midi_driver_winmidi.cpp                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifdef WINMIDI_ENABLED

#include "midi_driver_winmidi.h"

#include "core/string/print_string.h"

void MIDIDriverWinMidi::read(HMIDIIN hMidiIn, UINT wMsg, DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2) {
	if (wMsg == MIM_DATA) {
		receive_input_packet((uint64_t)dwParam2, (uint8_t *)&dwParam1, 3);
	}
}

Error MIDIDriverWinMidi::open() {
	for (UINT i = 0; i < midiInGetNumDevs(); i++) {
		HMIDIIN midi_in;

		MMRESULT res = midiInOpen(&midi_in, i, (DWORD_PTR)read, (DWORD_PTR)this, CALLBACK_FUNCTION);
		if (res == MMSYSERR_NOERROR) {
			midiInStart(midi_in);
			connected_sources.insert(i, midi_in);
		} else {
			char err[256];
			midiInGetErrorText(res, err, 256);
			ERR_PRINT("midiInOpen error: " + String(err));

			MIDIINCAPS caps;
			res = midiInGetDevCaps(i, &caps, sizeof(MIDIINCAPS));
			if (res == MMSYSERR_NOERROR) {
				ERR_PRINT("Can't open MIDI device \"" + String(caps.szPname) + "\", is it being used by another application?");
			}
		}
	}

	return OK;
}

PackedStringArray MIDIDriverWinMidi::get_connected_inputs() {
	PackedStringArray list;

	for (int i = 0; i < connected_sources.size(); i++) {
		HMIDIIN midi_in = connected_sources[i];
		UINT id = 0;
		MMRESULT res = midiInGetID(midi_in, &id);
		if (res == MMSYSERR_NOERROR) {
			MIDIINCAPS caps;
			res = midiInGetDevCaps(i, &caps, sizeof(MIDIINCAPS));
			if (res == MMSYSERR_NOERROR) {
				list.push_back(caps.szPname);
			}
		}
	}

	return list;
}

void MIDIDriverWinMidi::close() {
	for (int i = 0; i < connected_sources.size(); i++) {
		HMIDIIN midi_in = connected_sources[i];
		midiInStop(midi_in);
		midiInClose(midi_in);
	}
	connected_sources.clear();
}

MIDIDriverWinMidi::MIDIDriverWinMidi() {
}

MIDIDriverWinMidi::~MIDIDriverWinMidi() {
	close();
}

#endif // WINMIDI_ENABLED