1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*************************************************************************/
/* midi_driver_alsamidi.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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/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 = (MIDIDriverALSAMidi *)p_udata;
uint64_t timestamp = 0;
uint8_t buffer[256];
int expected_size = 255;
int bytes = 0;
while (!md->exit_thread) {
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 = false;
thread = Thread::create(MIDIDriverALSAMidi::thread_func, this);
return OK;
}
void MIDIDriverALSAMidi::close() {
if (thread) {
exit_thread = true;
Thread::wait_to_finish(thread);
memdelete(thread);
thread = nullptr;
}
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() {
thread = nullptr;
exit_thread = false;
}
MIDIDriverALSAMidi::~MIDIDriverALSAMidi() {
close();
}
#endif // ALSAMIDI_ENABLED
|