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ump-utils.h
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1/* Simple Plugin API */
2/* SPDX-FileCopyrightText: Copyright © 2024 Wim Taymans */
3/* SPDX-License-Identifier: MIT */
4
5
6#ifndef SPA_CONTROL_UMP_UTILS_H
7#define SPA_CONTROL_UMP_UTILS_H
8
9#include <errno.h>
10#include <spa/utils/defs.h>
11
12#ifdef __cplusplus
13 extern "C" {
14#endif
15
16#ifndef SPA_API_CONTROL_UMP_UTILS
17 #ifdef SPA_API_IMPL
18 #define SPA_API_CONTROL_UMP_UTILS SPA_API_IMPL
19 #else
20 #define SPA_API_CONTROL_UMP_UTILS static inline
21 #endif
22#endif
27
28 SPA_API_CONTROL_UMP_UTILS size_t spa_ump_message_size(uint8_t message_type)
29{
30 static const uint32_t ump_sizes[] = {
31 [0x0] = 1, /* Utility messages */
32 [0x1] = 1, /* System messages */
33 [0x2] = 1, /* MIDI 1.0 messages */
34 [0x3] = 2, /* 7bit SysEx messages */
35 [0x4] = 2, /* MIDI 2.0 messages */
36 [0x5] = 4, /* 8bit data message */
37 [0x6] = 1,
38 [0x7] = 1,
39 [0x8] = 2,
40 [0x9] = 2,
41 [0xa] = 2,
42 [0xb] = 3,
43 [0xc] = 3,
44 [0xd] = 4, /* Flexible data messages */
45 [0xe] = 4,
46 [0xf] = 4, /* Stream messages */
47 };
48 return ump_sizes[message_type & 0xf];
49}
50
51 SPA_API_CONTROL_UMP_UTILS int spa_ump_to_midi(const uint32_t **ump, size_t *ump_size,
52 uint8_t *midi, size_t midi_maxsize, uint64_t *state)
53{
54 int size = 0;
55 uint32_t to_consume = 0;
56 const uint32_t *u = *ump;
57
58 if (*ump_size < 4 ||
59 (to_consume = (spa_ump_message_size(u[0]>>28) * 4)) > *ump_size) {
60 to_consume = *ump_size;
61 goto done;
62 }
63 if (midi_maxsize < 8)
64 return -ENOSPC;
65
66 switch (u[0] >> 28) {
67 case 0x1: /* System Real Time and System Common Messages (except System Exclusive) */
68 midi[size++] = (u[0] >> 16) & 0xff;
69 if (midi[0] >= 0xf1 && midi[0] <= 0xf3) {
70 midi[size++] = (u[0] >> 8) & 0x7f;
71 if (midi[0] == 0xf2)
72 midi[size++] = u[0] & 0x7f;
73 }
74 break;
75 case 0x2: /* MIDI 1.0 Channel Voice Messages */
76 midi[size++] = (u[0] >> 16);
77 midi[size++] = (u[0] >> 8);
78 if (midi[0] < 0xc0 || midi[0] > 0xdf)
79 midi[size++] = (u[0]);
80 break;
81 case 0x3: /* Data Messages (including System Exclusive) */
82 {
83 uint8_t status, i, bytes;
84
85 status = (u[0] >> 20) & 0xf;
86 bytes = SPA_CLAMP((u[0] >> 16) & 0xf, 0u, 6u);
87
88 if (status == 0 || status == 1)
89 midi[size++] = 0xf0;
90 for (i = 0 ; i < bytes; i++)
91 /* u[0] >> 8 | u[0] | u[1] >> 24 | u[1] >>16 ... */
92 midi[size++] = u[(i+2)/4] >> ((5-i)%4 * 8);
93 if (status == 0 || status == 3)
94 midi[size++] = 0xf7;
95 break;
96 }
97 case 0x4: /* MIDI 2.0 Channel Voice Messages */
98 {
99 uint8_t status = (u[0] >> 16) | 0x80;
100 switch (status & 0xf0) {
101 case 0xc0:
102 /* program/bank change */
103 if (!(u[0] & 1))
104 *state = 2;
105 if (*state == 0) {
106 midi[size++] = (status & 0xf) | 0xb0;
107 midi[size++] = 0;
108 midi[size++] = (u[1] >> 8);
109 to_consume = 0;
110 *state = 1;
111 }
112 else if (*state == 1) {
113 midi[size++] = (status & 0xf) | 0xb0;
114 midi[size++] = 32;
115 midi[size++] = u[1];
116 to_consume = 0;
117 *state = 2;
118 }
119 else if (*state == 2) {
120 midi[size++] = status;
121 midi[size++] = (u[1] >> 24);
122 *state = 0;
123 }
124 break;
125 default:
126 midi[size++] = status;
127 midi[size++] = (u[0] >> 8) & 0x7f;
128 SPA_FALLTHROUGH;
129 case 0xd0:
130 midi[size++] = (u[1] >> 25);
131 break;
132 }
133 break;
134 }
135 case 0x0: /* Utility Messages */
136 case 0x5: /* Data Messages */
137 default:
138 break;
139 }
140done:
141 (*ump_size) -= to_consume;
142 (*ump) = SPA_PTROFF(*ump, to_consume, uint32_t);
143 return size;
144}
145
146 SPA_API_CONTROL_UMP_UTILS int spa_ump_from_midi(uint8_t **midi, size_t *midi_size,
147 uint32_t *ump, size_t ump_maxsize, uint8_t group, uint64_t *state)
148{
149 int size = 0;
150 uint32_t i, prefix = group << 24, to_consume = 0, bytes;
151 uint8_t status, *m = (*midi), end;
152
153 if (*midi_size < 1)
154 return 0;
155 if (ump_maxsize < 16)
156 return -ENOSPC;
157
158 status = m[0];
159
160 /* SysEx */
161 if (*state == 0) {
162 if (status == 0xf0)
163 *state = 1; /* sysex start */
164 else if (status == 0xf7)
165 *state = 2; /* sysex continue */
166 }
167 if (*state & 3) {
168 prefix |= 0x30000000;
169 if (status & 0x80) {
170 m++;
171 to_consume++;
172 }
173 bytes = SPA_CLAMP(*midi_size - to_consume, 0u, 7u);
174 if (bytes > 0) {
175 end = m[bytes-1];
176 if (end & 0x80) {
177 bytes--; /* skip terminator */
178 to_consume++;
179 }
180 else
181 end = 0xf0; /* pretend there is a continue terminator */
182
183 bytes = SPA_CLAMP(bytes, 0u, 6u);
184 to_consume += bytes;
185
186 if (end == 0xf7) {
187 if (*state == 2) {
188 /* continue and done */
189 prefix |= 0x3 << 20;
190 *state = 0;
191 }
192 } else if (*state == 1) {
193 /* first packet but not finished */
194 prefix |= 0x1 << 20;
195 *state = 2; /* sysex continue */
196 } else {
197 /* continue and not finished */
198 prefix |= 0x2 << 20;
199 }
200 ump[size++] = prefix | bytes << 16;
201 ump[size++] = 0;
202 for (i = 0 ; i < bytes; i++)
203 /* ump[0] |= (m[0] & 0x7f) << 8
204 * ump[0] |= (m[1] & 0x7f)
205 * ump[1] |= (m[2] & 0x7f) << 24
206 * ... */
207 ump[(i+2)/4] |= (m[i] & 0x7f) << ((5-i)%4 * 8);
208 }
209 } else {
210 /* regular messages */
211 switch (status) {
212 case 0x80 ... 0x8f:
213 case 0x90 ... 0x9f:
214 case 0xa0 ... 0xaf:
215 case 0xb0 ... 0xbf:
216 case 0xe0 ... 0xef:
217 to_consume = 3;
218 prefix |= 0x20000000;
219 break;
220 case 0xc0 ... 0xdf:
221 to_consume = 2;
222 prefix |= 0x20000000;
223 break;
224 case 0xf2:
225 to_consume = 3;
226 prefix |= 0x10000000;
227 break;
228 case 0xf1: case 0xf3:
229 to_consume = 2;
230 prefix |= 0x10000000;
231 break;
232 case 0xf4 ... 0xff:
233 to_consume = 1;
234 prefix |= 0x10000000;
235 break;
236 default:
237 return -EIO;
238 }
239 if (*midi_size < to_consume) {
240 to_consume = *midi_size;
241 } else {
242 prefix |= status << 16;
243 if (to_consume > 1)
244 prefix |= (m[1] & 0x7f) << 8;
245 if (to_consume > 2)
246 prefix |= (m[2] & 0x7f);
247 ump[size++] = prefix;
248 }
249 }
250 (*midi_size) -= to_consume;
251 (*midi) += to_consume;
252
253 return size * 4;
254}
255
259
260#ifdef __cplusplus
261} /* extern "C" */
262#endif
263
264#endif /* SPA_CONTROL_UMP_UTILS_H */
defs.h
spa/utils/defs.h
spa_ump_to_midi
SPA_API_CONTROL_UMP_UTILS int spa_ump_to_midi(const uint32_t **ump, size_t *ump_size, uint8_t *midi, size_t midi_maxsize, uint64_t *state)
Definition ump-utils.h:58
spa_ump_message_size
SPA_API_CONTROL_UMP_UTILS size_t spa_ump_message_size(uint8_t message_type)
Definition ump-utils.h:35
spa_ump_from_midi
SPA_API_CONTROL_UMP_UTILS int spa_ump_from_midi(uint8_t **midi, size_t *midi_size, uint32_t *ump, size_t ump_maxsize, uint8_t group, uint64_t *state)
Definition ump-utils.h:153
SPA_CLAMP
#define SPA_CLAMP(v, low, high)
Definition defs.h:177
SPA_FALLTHROUGH
#define SPA_FALLTHROUGH
SPA_FALLTHROUGH is an annotation to suppress compiler warnings about switch cases that fall through w...
Definition defs.h:84
SPA_PTROFF
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition defs.h:222
SPA_API_CONTROL_UMP_UTILS
#define SPA_API_CONTROL_UMP_UTILS
Definition ump-utils.h:27