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sound: seq_midi_event: fix decoding of (N)RPN events
[linux-2.6/mini2440.git] / sound / core / seq / seq_midi_event.c
blobb5d6ea4904c091c9b2733308d380cdaa995fe98d
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 <sound/core.h>
26 #include <sound/seq_kernel.h>
27 #include <sound/seq_midi_event.h>
28 #include <sound/asoundef.h>
29
30 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
31 MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
32 MODULE_LICENSE("GPL");
33
34 /* event type, index into status_event[] */
35 /* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
36 #define ST_INVALID 7
37 #define ST_SPECIAL 8
38 #define ST_SYSEX ST_SPECIAL
39 /* from 8 to 15 are events for 0xf0-0xf7 */
40
41
42 /*
43 * prototypes
44 */
45 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
46 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
47 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
48 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
49 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
50 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
51 static void note_decode(struct snd_seq_event *ev, unsigned char *buf);
52 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf);
53 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf);
54 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf);
55 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf);
56
57 /*
58 * event list
59 */
60 static struct status_event_list {
61 int event;
62 int qlen;
63 void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
64 void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
65 } status_event[] = {
66 /* 0x80 - 0xef */
67 {SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
68 {SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
69 {SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
70 {SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
71 {SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
72 {SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
73 {SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
74 /* invalid */
75 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL},
76 /* 0xf0 - 0xff */
77 {SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
78 {SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
79 {SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
80 {SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
81 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf4 */
82 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf5 */
83 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
84 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf7 */
85 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
86 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf9 */
87 {SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
88 {SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
89 {SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
90 {SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xfd */
91 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
92 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
93 };
94
95 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf, int len,
96 struct snd_seq_event *ev);
97 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf, int count,
98 struct snd_seq_event *ev);
99
100 static struct extra_event_list {
101 int event;
102 int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
103 struct snd_seq_event *ev);
104 } extra_event[] = {
105 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
106 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
107 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
108 };
109
110 /*
111 * new/delete record
112 */
113
114 int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
115 {
116 struct snd_midi_event *dev;
117
118 *rdev = NULL;
119 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
120 if (dev == NULL)
121 return -ENOMEM;
122 if (bufsize > 0) {
123 dev->buf = kmalloc(bufsize, GFP_KERNEL);
124 if (dev->buf == NULL) {
125 kfree(dev);
126 return -ENOMEM;
127 }
128 }
129 dev->bufsize = bufsize;
130 dev->lastcmd = 0xff;
131 dev->type = ST_INVALID;
132 spin_lock_init(&dev->lock);
133 *rdev = dev;
134 return 0;
135 }
136
137 void snd_midi_event_free(struct snd_midi_event *dev)
138 {
139 if (dev != NULL) {
140 kfree(dev->buf);
141 kfree(dev);
142 }
143 }
144
145 /*
146 * initialize record
147 */
148 static inline void reset_encode(struct snd_midi_event *dev)
149 {
150 dev->read = 0;
151 dev->qlen = 0;
152 dev->type = ST_INVALID;
153 }
154
155 void snd_midi_event_reset_encode(struct snd_midi_event *dev)
156 {
157 unsigned long flags;
158
159 spin_lock_irqsave(&dev->lock, flags);
160 reset_encode(dev);
161 spin_unlock_irqrestore(&dev->lock, flags);
162 }
163
164 void snd_midi_event_reset_decode(struct snd_midi_event *dev)
165 {
166 unsigned long flags;
167
168 spin_lock_irqsave(&dev->lock, flags);
169 dev->lastcmd = 0xff;
170 spin_unlock_irqrestore(&dev->lock, flags);
171 }
172
173 #if 0
174 void snd_midi_event_init(struct snd_midi_event *dev)
175 {
176 snd_midi_event_reset_encode(dev);
177 snd_midi_event_reset_decode(dev);
178 }
179 #endif /* 0 */
180
181 void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
182 {
183 dev->nostat = on ? 1 : 0;
184 }
185
186 /*
187 * resize buffer
188 */
189 #if 0
190 int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
191 {
192 unsigned char *new_buf, *old_buf;
193 unsigned long flags;
194
195 if (bufsize == dev->bufsize)
196 return 0;
197 new_buf = kmalloc(bufsize, GFP_KERNEL);
198 if (new_buf == NULL)
199 return -ENOMEM;
200 spin_lock_irqsave(&dev->lock, flags);
201 old_buf = dev->buf;
202 dev->buf = new_buf;
203 dev->bufsize = bufsize;
204 reset_encode(dev);
205 spin_unlock_irqrestore(&dev->lock, flags);
206 kfree(old_buf);
207 return 0;
208 }
209 #endif /* 0 */
210
211 /*
212 * read bytes and encode to sequencer event if finished
213 * return the size of encoded bytes
214 */
215 long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
216 struct snd_seq_event *ev)
217 {
218 long result = 0;
219 int rc;
220
221 ev->type = SNDRV_SEQ_EVENT_NONE;
222
223 while (count-- > 0) {
224 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
225 result++;
226 if (rc < 0)
227 return rc;
228 else if (rc > 0)
229 return result;
230 }
231
232 return result;
233 }
234
235 /*
236 * read one byte and encode to sequencer event:
237 * return 1 if MIDI bytes are encoded to an event
238 * 0 data is not finished
239 * negative for error
240 */
241 int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
242 struct snd_seq_event *ev)
243 {
244 int rc = 0;
245 unsigned long flags;
246
247 c &= 0xff;
248
249 if (c >= MIDI_CMD_COMMON_CLOCK) {
250 /* real-time event */
251 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
252 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
253 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
254 return ev->type != SNDRV_SEQ_EVENT_NONE;
255 }
256
257 spin_lock_irqsave(&dev->lock, flags);
258 if ((c & 0x80) &&
259 (c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
260 /* new command */
261 dev->buf[0] = c;
262 if ((c & 0xf0) == 0xf0) /* system messages */
263 dev->type = (c & 0x0f) + ST_SPECIAL;
264 else
265 dev->type = (c >> 4) & 0x07;
266 dev->read = 1;
267 dev->qlen = status_event[dev->type].qlen;
268 } else {
269 if (dev->qlen > 0) {
270 /* rest of command */
271 dev->buf[dev->read++] = c;
272 if (dev->type != ST_SYSEX)
273 dev->qlen--;
274 } else {
275 /* running status */
276 dev->buf[1] = c;
277 dev->qlen = status_event[dev->type].qlen - 1;
278 dev->read = 2;
279 }
280 }
281 if (dev->qlen == 0) {
282 ev->type = status_event[dev->type].event;
283 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
284 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
285 if (status_event[dev->type].encode) /* set data values */
286 status_event[dev->type].encode(dev, ev);
287 if (dev->type >= ST_SPECIAL)
288 dev->type = ST_INVALID;
289 rc = 1;
290 } else if (dev->type == ST_SYSEX) {
291 if (c == MIDI_CMD_COMMON_SYSEX_END ||
292 dev->read >= dev->bufsize) {
293 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
294 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
295 ev->type = SNDRV_SEQ_EVENT_SYSEX;
296 ev->data.ext.len = dev->read;
297 ev->data.ext.ptr = dev->buf;
298 if (c != MIDI_CMD_COMMON_SYSEX_END)
299 dev->read = 0; /* continue to parse */
300 else
301 reset_encode(dev); /* all parsed */
302 rc = 1;
303 }
304 }
305
306 spin_unlock_irqrestore(&dev->lock, flags);
307 return rc;
308 }
309
310 /* encode note event */
311 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
312 {
313 ev->data.note.channel = dev->buf[0] & 0x0f;
314 ev->data.note.note = dev->buf[1];
315 ev->data.note.velocity = dev->buf[2];
316 }
317
318 /* encode one parameter controls */
319 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
320 {
321 ev->data.control.channel = dev->buf[0] & 0x0f;
322 ev->data.control.value = dev->buf[1];
323 }
324
325 /* encode pitch wheel change */
326 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
327 {
328 ev->data.control.channel = dev->buf[0] & 0x0f;
329 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
330 }
331
332 /* encode midi control change */
333 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
334 {
335 ev->data.control.channel = dev->buf[0] & 0x0f;
336 ev->data.control.param = dev->buf[1];
337 ev->data.control.value = dev->buf[2];
338 }
339
340 /* encode one parameter value*/
341 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
342 {
343 ev->data.control.value = dev->buf[1];
344 }
345
346 /* encode song position */
347 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
348 {
349 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
350 }
351
352 /*
353 * decode from a sequencer event to midi bytes
354 * return the size of decoded midi events
355 */
356 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
357 struct snd_seq_event *ev)
358 {
359 unsigned int cmd, type;
360
361 if (ev->type == SNDRV_SEQ_EVENT_NONE)
362 return -ENOENT;
363
364 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
365 if (ev->type == status_event[type].event)
366 goto __found;
367 }
368 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
369 if (ev->type == extra_event[type].event)
370 return extra_event[type].decode(dev, buf, count, ev);
371 }
372 return -ENOENT;
373
374 __found:
375 if (type >= ST_SPECIAL)
376 cmd = 0xf0 + (type - ST_SPECIAL);
377 else
378 /* data.note.channel and data.control.channel is identical */
379 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
380
381
382 if (cmd == MIDI_CMD_COMMON_SYSEX) {
383 snd_midi_event_reset_decode(dev);
384 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
385 } else {
386 int qlen;
387 unsigned char xbuf[4];
388 unsigned long flags;
389
390 spin_lock_irqsave(&dev->lock, flags);
391 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
392 dev->lastcmd = cmd;
393 spin_unlock_irqrestore(&dev->lock, flags);
394 xbuf[0] = cmd;
395 if (status_event[type].decode)
396 status_event[type].decode(ev, xbuf + 1);
397 qlen = status_event[type].qlen + 1;
398 } else {
399 spin_unlock_irqrestore(&dev->lock, flags);
400 if (status_event[type].decode)
401 status_event[type].decode(ev, xbuf + 0);
402 qlen = status_event[type].qlen;
403 }
404 if (count < qlen)
405 return -ENOMEM;
406 memcpy(buf, xbuf, qlen);
407 return qlen;
408 }
409 }
410
411
412 /* decode note event */
413 static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
414 {
415 buf[0] = ev->data.note.note & 0x7f;
416 buf[1] = ev->data.note.velocity & 0x7f;
417 }
418
419 /* decode one parameter controls */
420 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
421 {
422 buf[0] = ev->data.control.value & 0x7f;
423 }
424
425 /* decode pitch wheel change */
426 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
427 {
428 int value = ev->data.control.value + 8192;
429 buf[0] = value & 0x7f;
430 buf[1] = (value >> 7) & 0x7f;
431 }
432
433 /* decode midi control change */
434 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
435 {
436 buf[0] = ev->data.control.param & 0x7f;
437 buf[1] = ev->data.control.value & 0x7f;
438 }
439
440 /* decode song position */
441 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
442 {
443 buf[0] = ev->data.control.value & 0x7f;
444 buf[1] = (ev->data.control.value >> 7) & 0x7f;
445 }
446
447 /* decode 14bit control */
448 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
449 int count, struct snd_seq_event *ev)
450 {
451 unsigned char cmd;
452 int idx = 0;
453
454 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
455 if (ev->data.control.param < 0x20) {
456 if (count < 4)
457 return -ENOMEM;
458 if (dev->nostat && count < 6)
459 return -ENOMEM;
460 if (cmd != dev->lastcmd || dev->nostat) {
461 if (count < 5)
462 return -ENOMEM;
463 buf[idx++] = dev->lastcmd = cmd;
464 }
465 buf[idx++] = ev->data.control.param;
466 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
467 if (dev->nostat)
468 buf[idx++] = cmd;
469 buf[idx++] = ev->data.control.param + 0x20;
470 buf[idx++] = ev->data.control.value & 0x7f;
471 } else {
472 if (count < 2)
473 return -ENOMEM;
474 if (cmd != dev->lastcmd || dev->nostat) {
475 if (count < 3)
476 return -ENOMEM;
477 buf[idx++] = dev->lastcmd = cmd;
478 }
479 buf[idx++] = ev->data.control.param & 0x7f;
480 buf[idx++] = ev->data.control.value & 0x7f;
481 }
482 return idx;
483 }
484
485 /* decode reg/nonreg param */
486 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
487 int count, struct snd_seq_event *ev)
488 {
489 unsigned char cmd;
490 char *cbytes;
491 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
492 MIDI_CTL_NONREG_PARM_NUM_LSB,
493 MIDI_CTL_MSB_DATA_ENTRY,
494 MIDI_CTL_LSB_DATA_ENTRY };
495 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
496 MIDI_CTL_REGIST_PARM_NUM_LSB,
497 MIDI_CTL_MSB_DATA_ENTRY,
498 MIDI_CTL_LSB_DATA_ENTRY };
499 unsigned char bytes[4];
500 int idx = 0, i;
501
502 if (count < 8)
503 return -ENOMEM;
504 if (dev->nostat && count < 12)
505 return -ENOMEM;
506 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
507 bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
508 bytes[1] = ev->data.control.param & 0x007f;
509 bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
510 bytes[3] = ev->data.control.value & 0x007f;
511 if (cmd != dev->lastcmd && !dev->nostat) {
512 if (count < 9)
513 return -ENOMEM;
514 buf[idx++] = dev->lastcmd = cmd;
515 }
516 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
517 for (i = 0; i < 4; i++) {
518 if (dev->nostat)
519 buf[idx++] = dev->lastcmd = cmd;
520 buf[idx++] = cbytes[i];
521 buf[idx++] = bytes[i];
522 }
523 return idx;
524 }
525
526 /*
527 * exports
528 */
529
530 EXPORT_SYMBOL(snd_midi_event_new);
531 EXPORT_SYMBOL(snd_midi_event_free);
532 EXPORT_SYMBOL(snd_midi_event_reset_encode);
533 EXPORT_SYMBOL(snd_midi_event_reset_decode);
534 EXPORT_SYMBOL(snd_midi_event_no_status);
535 EXPORT_SYMBOL(snd_midi_event_encode);
536 EXPORT_SYMBOL(snd_midi_event_encode_byte);
537 EXPORT_SYMBOL(snd_midi_event_decode);
538
539 static int __init alsa_seq_midi_event_init(void)
540 {
541 return 0;
542 }
543
544 static void __exit alsa_seq_midi_event_exit(void)
545 {
546 }
547
548 module_init(alsa_seq_midi_event_init)
549 module_exit(alsa_seq_midi_event_exit)
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