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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / sound / core / seq / seq_midi_event.c
blob90bbbdbeba03b4d5b2cc62fc8b9cad65c9635624
1 /*
2 * MIDI byte <-> sequencer event coder
3 *
4 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
5 * Jaroslav Kysela <perex@perex.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/module.h>
26 #include <sound/core.h>
27 #include <sound/seq_kernel.h>
28 #include <sound/seq_midi_event.h>
29 #include <sound/asoundef.h>
30
31 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
32 MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
33 MODULE_LICENSE("GPL");
34
35 /* event type, index into status_event[] */
36 /* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
37 #define ST_INVALID 7
38 #define ST_SPECIAL 8
39 #define ST_SYSEX ST_SPECIAL
40 /* from 8 to 15 are events for 0xf0-0xf7 */
41
42
43 /*
44 * prototypes
45 */
46 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
47 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
48 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
49 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
50 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
51 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
52 static void note_decode(struct snd_seq_event *ev, unsigned char *buf);
53 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf);
54 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf);
55 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf);
56 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf);
57
58 /*
59 * event list
60 */
61 static struct status_event_list {
62 int event;
63 int qlen;
64 void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
65 void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
66 } status_event[] = {
67 /* 0x80 - 0xef */
68 {SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
69 {SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
70 {SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
71 {SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
72 {SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
73 {SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
74 {SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
75 /* invalid */
76 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL},
77 /* 0xf0 - 0xff */
78 {SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
79 {SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
80 {SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
81 {SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
82 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf4 */
83 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf5 */
84 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
85 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf7 */
86 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
87 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf9 */
88 {SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
89 {SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
90 {SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
91 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xfd */
92 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
93 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
94 };
95
96 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf, int len,
97 struct snd_seq_event *ev);
98 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf, int count,
99 struct snd_seq_event *ev);
100
101 static struct extra_event_list {
102 int event;
103 int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
104 struct snd_seq_event *ev);
105 } extra_event[] = {
106 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
107 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
108 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
109 };
110
111 /*
112 * new/delete record
113 */
114
115 int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
116 {
117 struct snd_midi_event *dev;
118
119 *rdev = NULL;
120 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
121 if (dev == NULL)
122 return -ENOMEM;
123 if (bufsize > 0) {
124 dev->buf = kmalloc(bufsize, GFP_KERNEL);
125 if (dev->buf == NULL) {
126 kfree(dev);
127 return -ENOMEM;
128 }
129 }
130 dev->bufsize = bufsize;
131 dev->lastcmd = 0xff;
132 dev->type = ST_INVALID;
133 spin_lock_init(&dev->lock);
134 *rdev = dev;
135 return 0;
136 }
137 EXPORT_SYMBOL(snd_midi_event_new);
138
139 void snd_midi_event_free(struct snd_midi_event *dev)
140 {
141 if (dev != NULL) {
142 kfree(dev->buf);
143 kfree(dev);
144 }
145 }
146 EXPORT_SYMBOL(snd_midi_event_free);
147
148 /*
149 * initialize record
150 */
151 static inline void reset_encode(struct snd_midi_event *dev)
152 {
153 dev->read = 0;
154 dev->qlen = 0;
155 dev->type = ST_INVALID;
156 }
157
158 void snd_midi_event_reset_encode(struct snd_midi_event *dev)
159 {
160 unsigned long flags;
161
162 spin_lock_irqsave(&dev->lock, flags);
163 reset_encode(dev);
164 spin_unlock_irqrestore(&dev->lock, flags);
165 }
166 EXPORT_SYMBOL(snd_midi_event_reset_encode);
167
168 void snd_midi_event_reset_decode(struct snd_midi_event *dev)
169 {
170 unsigned long flags;
171
172 spin_lock_irqsave(&dev->lock, flags);
173 dev->lastcmd = 0xff;
174 spin_unlock_irqrestore(&dev->lock, flags);
175 }
176 EXPORT_SYMBOL(snd_midi_event_reset_decode);
177
178 #if 0
179 void snd_midi_event_init(struct snd_midi_event *dev)
180 {
181 snd_midi_event_reset_encode(dev);
182 snd_midi_event_reset_decode(dev);
183 }
184 #endif /* 0 */
185
186 void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
187 {
188 dev->nostat = on ? 1 : 0;
189 }
190 EXPORT_SYMBOL(snd_midi_event_no_status);
191
192 /*
193 * resize buffer
194 */
195 #if 0
196 int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
197 {
198 unsigned char *new_buf, *old_buf;
199 unsigned long flags;
200
201 if (bufsize == dev->bufsize)
202 return 0;
203 new_buf = kmalloc(bufsize, GFP_KERNEL);
204 if (new_buf == NULL)
205 return -ENOMEM;
206 spin_lock_irqsave(&dev->lock, flags);
207 old_buf = dev->buf;
208 dev->buf = new_buf;
209 dev->bufsize = bufsize;
210 reset_encode(dev);
211 spin_unlock_irqrestore(&dev->lock, flags);
212 kfree(old_buf);
213 return 0;
214 }
215 #endif /* 0 */
216
217 /*
218 * read bytes and encode to sequencer event if finished
219 * return the size of encoded bytes
220 */
221 long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
222 struct snd_seq_event *ev)
223 {
224 long result = 0;
225 int rc;
226
227 ev->type = SNDRV_SEQ_EVENT_NONE;
228
229 while (count-- > 0) {
230 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
231 result++;
232 if (rc < 0)
233 return rc;
234 else if (rc > 0)
235 return result;
236 }
237
238 return result;
239 }
240 EXPORT_SYMBOL(snd_midi_event_encode);
241
242 /*
243 * read one byte and encode to sequencer event:
244 * return 1 if MIDI bytes are encoded to an event
245 * 0 data is not finished
246 * negative for error
247 */
248 int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
249 struct snd_seq_event *ev)
250 {
251 int rc = 0;
252 unsigned long flags;
253
254 c &= 0xff;
255
256 if (c >= MIDI_CMD_COMMON_CLOCK) {
257 /* real-time event */
258 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
259 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
260 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
261 return ev->type != SNDRV_SEQ_EVENT_NONE;
262 }
263
264 spin_lock_irqsave(&dev->lock, flags);
265 if ((c & 0x80) &&
266 (c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
267 /* new command */
268 dev->buf[0] = c;
269 if ((c & 0xf0) == 0xf0) /* system messages */
270 dev->type = (c & 0x0f) + ST_SPECIAL;
271 else
272 dev->type = (c >> 4) & 0x07;
273 dev->read = 1;
274 dev->qlen = status_event[dev->type].qlen;
275 } else {
276 if (dev->qlen > 0) {
277 /* rest of command */
278 dev->buf[dev->read++] = c;
279 if (dev->type != ST_SYSEX)
280 dev->qlen--;
281 } else {
282 /* running status */
283 dev->buf[1] = c;
284 dev->qlen = status_event[dev->type].qlen - 1;
285 dev->read = 2;
286 }
287 }
288 if (dev->qlen == 0) {
289 ev->type = status_event[dev->type].event;
290 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
291 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
292 if (status_event[dev->type].encode) /* set data values */
293 status_event[dev->type].encode(dev, ev);
294 if (dev->type >= ST_SPECIAL)
295 dev->type = ST_INVALID;
296 rc = 1;
297 } else if (dev->type == ST_SYSEX) {
298 if (c == MIDI_CMD_COMMON_SYSEX_END ||
299 dev->read >= dev->bufsize) {
300 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
301 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
302 ev->type = SNDRV_SEQ_EVENT_SYSEX;
303 ev->data.ext.len = dev->read;
304 ev->data.ext.ptr = dev->buf;
305 if (c != MIDI_CMD_COMMON_SYSEX_END)
306 dev->read = 0; /* continue to parse */
307 else
308 reset_encode(dev); /* all parsed */
309 rc = 1;
310 }
311 }
312
313 spin_unlock_irqrestore(&dev->lock, flags);
314 return rc;
315 }
316 EXPORT_SYMBOL(snd_midi_event_encode_byte);
317
318 /* encode note event */
319 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
320 {
321 ev->data.note.channel = dev->buf[0] & 0x0f;
322 ev->data.note.note = dev->buf[1];
323 ev->data.note.velocity = dev->buf[2];
324 }
325
326 /* encode one parameter controls */
327 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
328 {
329 ev->data.control.channel = dev->buf[0] & 0x0f;
330 ev->data.control.value = dev->buf[1];
331 }
332
333 /* encode pitch wheel change */
334 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
335 {
336 ev->data.control.channel = dev->buf[0] & 0x0f;
337 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
338 }
339
340 /* encode midi control change */
341 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
342 {
343 ev->data.control.channel = dev->buf[0] & 0x0f;
344 ev->data.control.param = dev->buf[1];
345 ev->data.control.value = dev->buf[2];
346 }
347
348 /* encode one parameter value*/
349 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
350 {
351 ev->data.control.value = dev->buf[1];
352 }
353
354 /* encode song position */
355 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
356 {
357 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
358 }
359
360 /*
361 * decode from a sequencer event to midi bytes
362 * return the size of decoded midi events
363 */
364 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
365 struct snd_seq_event *ev)
366 {
367 unsigned int cmd, type;
368
369 if (ev->type == SNDRV_SEQ_EVENT_NONE)
370 return -ENOENT;
371
372 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
373 if (ev->type == status_event[type].event)
374 goto __found;
375 }
376 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
377 if (ev->type == extra_event[type].event)
378 return extra_event[type].decode(dev, buf, count, ev);
379 }
380 return -ENOENT;
381
382 __found:
383 if (type >= ST_SPECIAL)
384 cmd = 0xf0 + (type - ST_SPECIAL);
385 else
386 /* data.note.channel and data.control.channel is identical */
387 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
388
389
390 if (cmd == MIDI_CMD_COMMON_SYSEX) {
391 snd_midi_event_reset_decode(dev);
392 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
393 } else {
394 int qlen;
395 unsigned char xbuf[4];
396 unsigned long flags;
397
398 spin_lock_irqsave(&dev->lock, flags);
399 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
400 dev->lastcmd = cmd;
401 spin_unlock_irqrestore(&dev->lock, flags);
402 xbuf[0] = cmd;
403 if (status_event[type].decode)
404 status_event[type].decode(ev, xbuf + 1);
405 qlen = status_event[type].qlen + 1;
406 } else {
407 spin_unlock_irqrestore(&dev->lock, flags);
408 if (status_event[type].decode)
409 status_event[type].decode(ev, xbuf + 0);
410 qlen = status_event[type].qlen;
411 }
412 if (count < qlen)
413 return -ENOMEM;
414 memcpy(buf, xbuf, qlen);
415 return qlen;
416 }
417 }
418 EXPORT_SYMBOL(snd_midi_event_decode);
419
420
421 /* decode note event */
422 static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
423 {
424 buf[0] = ev->data.note.note & 0x7f;
425 buf[1] = ev->data.note.velocity & 0x7f;
426 }
427
428 /* decode one parameter controls */
429 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
430 {
431 buf[0] = ev->data.control.value & 0x7f;
432 }
433
434 /* decode pitch wheel change */
435 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
436 {
437 int value = ev->data.control.value + 8192;
438 buf[0] = value & 0x7f;
439 buf[1] = (value >> 7) & 0x7f;
440 }
441
442 /* decode midi control change */
443 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
444 {
445 buf[0] = ev->data.control.param & 0x7f;
446 buf[1] = ev->data.control.value & 0x7f;
447 }
448
449 /* decode song position */
450 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
451 {
452 buf[0] = ev->data.control.value & 0x7f;
453 buf[1] = (ev->data.control.value >> 7) & 0x7f;
454 }
455
456 /* decode 14bit control */
457 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
458 int count, struct snd_seq_event *ev)
459 {
460 unsigned char cmd;
461 int idx = 0;
462
463 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
464 if (ev->data.control.param < 0x20) {
465 if (count < 4)
466 return -ENOMEM;
467 if (dev->nostat && count < 6)
468 return -ENOMEM;
469 if (cmd != dev->lastcmd || dev->nostat) {
470 if (count < 5)
471 return -ENOMEM;
472 buf[idx++] = dev->lastcmd = cmd;
473 }
474 buf[idx++] = ev->data.control.param;
475 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
476 if (dev->nostat)
477 buf[idx++] = cmd;
478 buf[idx++] = ev->data.control.param + 0x20;
479 buf[idx++] = ev->data.control.value & 0x7f;
480 } else {
481 if (count < 2)
482 return -ENOMEM;
483 if (cmd != dev->lastcmd || dev->nostat) {
484 if (count < 3)
485 return -ENOMEM;
486 buf[idx++] = dev->lastcmd = cmd;
487 }
488 buf[idx++] = ev->data.control.param & 0x7f;
489 buf[idx++] = ev->data.control.value & 0x7f;
490 }
491 return idx;
492 }
493
494 /* decode reg/nonreg param */
495 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
496 int count, struct snd_seq_event *ev)
497 {
498 unsigned char cmd;
499 char *cbytes;
500 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
501 MIDI_CTL_NONREG_PARM_NUM_LSB,
502 MIDI_CTL_MSB_DATA_ENTRY,
503 MIDI_CTL_LSB_DATA_ENTRY };
504 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
505 MIDI_CTL_REGIST_PARM_NUM_LSB,
506 MIDI_CTL_MSB_DATA_ENTRY,
507 MIDI_CTL_LSB_DATA_ENTRY };
508 unsigned char bytes[4];
509 int idx = 0, i;
510
511 if (count < 8)
512 return -ENOMEM;
513 if (dev->nostat && count < 12)
514 return -ENOMEM;
515 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
516 bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
517 bytes[1] = ev->data.control.param & 0x007f;
518 bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
519 bytes[3] = ev->data.control.value & 0x007f;
520 if (cmd != dev->lastcmd && !dev->nostat) {
521 if (count < 9)
522 return -ENOMEM;
523 buf[idx++] = dev->lastcmd = cmd;
524 }
525 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
526 for (i = 0; i < 4; i++) {
527 if (dev->nostat)
528 buf[idx++] = dev->lastcmd = cmd;
529 buf[idx++] = cbytes[i];
530 buf[idx++] = bytes[i];
531 }
532 return idx;
533 }
534
535 static int __init alsa_seq_midi_event_init(void)
536 {
537 return 0;
538 }
539
540 static void __exit alsa_seq_midi_event_exit(void)
541 {
542 }
543
544 module_init(alsa_seq_midi_event_init)
545 module_exit(alsa_seq_midi_event_exit)
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