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/*************************************************************************/
/* midi_driver_alsamidi.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef ALSAMIDI_ENABLED
#include "midi_driver_alsamidi.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
#include <errno.h>
static int get_message_size(uint8_t message) {
switch (message & 0xF0) {
case 0x80: // note off
case 0x90: // note on
case 0xA0: // aftertouch
case 0xB0: // continuous controller
case 0xE0: // pitch bend
case 0xF2: // song position pointer
return 3;
case 0xC0: // patch change
case 0xD0: // channel pressure
case 0xF1: // time code quarter frame
case 0xF3: // song select
return 2;
case 0xF0: // SysEx start
case 0xF4: // reserved
case 0xF5: // reserved
case 0xF6: // tune request
case 0xF7: // SysEx end
case 0xF8: // timing clock
case 0xF9: // reserved
case 0xFA: // start
case 0xFB: // continue
case 0xFC: // stop
case 0xFD: // reserved
case 0xFE: // active sensing
case 0xFF: // reset
return 1;
}
return 256;
}
void MIDIDriverALSAMidi::thread_func(void *p_udata) {
MIDIDriverALSAMidi *md = static_cast<MIDIDriverALSAMidi *>(p_udata);
uint64_t timestamp = 0;
uint8_t buffer[256];
int expected_size = 255;
int bytes = 0;
while (!md->exit_thread.is_set()) {
int ret;
md->lock();
for (int i = 0; i < md->connected_inputs.size(); i++) {
snd_rawmidi_t *midi_in = md->connected_inputs[i];
do {
uint8_t byte = 0;
ret = snd_rawmidi_read(midi_in, &byte, 1);
if (ret < 0) {
if (ret != -EAGAIN) {
ERR_PRINT("snd_rawmidi_read error: " + String(snd_strerror(ret)));
}
} else {
if (byte & 0x80) {
// Flush previous packet if there is any
if (bytes) {
md->receive_input_packet(timestamp, buffer, bytes);
bytes = 0;
}
expected_size = get_message_size(byte);
// After a SysEx start, all bytes are data until a SysEx end, so
// we're going to end the command at the SES, and let the common
// driver ignore the following data bytes.
}
if (bytes < 256) {
buffer[bytes++] = byte;
// If we know the size of the current packet receive it if it reached the expected size
if (bytes >= expected_size) {
md->receive_input_packet(timestamp, buffer, bytes);
bytes = 0;
}
}
}
} while (ret > 0);
}
md->unlock();
OS::get_singleton()->delay_usec(1000);
}
}
Error MIDIDriverALSAMidi::open() {
void **hints;
if (snd_device_name_hint(-1, "rawmidi", &hints) < 0) {
return ERR_CANT_OPEN;
}
int i = 0;
for (void **n = hints; *n != nullptr; n++) {
char *name = snd_device_name_get_hint(*n, "NAME");
if (name != nullptr) {
snd_rawmidi_t *midi_in;
int ret = snd_rawmidi_open(&midi_in, nullptr, name, SND_RAWMIDI_NONBLOCK);
if (ret >= 0) {
connected_inputs.insert(i++, midi_in);
}
}
if (name != nullptr) {
free(name);
}
}
snd_device_name_free_hint(hints);
exit_thread.clear();
thread.start(MIDIDriverALSAMidi::thread_func, this);
return OK;
}
void MIDIDriverALSAMidi::close() {
exit_thread.set();
thread.wait_to_finish();
for (int i = 0; i < connected_inputs.size(); i++) {
snd_rawmidi_t *midi_in = connected_inputs[i];
snd_rawmidi_close(midi_in);
}
connected_inputs.clear();
}
void MIDIDriverALSAMidi::lock() const {
mutex.lock();
}
void MIDIDriverALSAMidi::unlock() const {
mutex.unlock();
}
PackedStringArray MIDIDriverALSAMidi::get_connected_inputs() {
PackedStringArray list;
lock();
for (int i = 0; i < connected_inputs.size(); i++) {
snd_rawmidi_t *midi_in = connected_inputs[i];
snd_rawmidi_info_t *info;
snd_rawmidi_info_malloc(&info);
snd_rawmidi_info(midi_in, info);
list.push_back(snd_rawmidi_info_get_name(info));
snd_rawmidi_info_free(info);
}
unlock();
return list;
}
MIDIDriverALSAMidi::MIDIDriverALSAMidi() {
exit_thread.clear();
}
MIDIDriverALSAMidi::~MIDIDriverALSAMidi() {
close();
}
#endif // ALSAMIDI_ENABLED
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