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[PATCH] kprobes: fix single-step out of line - take2
[linux-2.6/linux-2.6-openrd.git] / sound / core / seq / seq_midi_event.c
blobdf1e2bb397458f1cea7d5388f250f95ff760b0b2
1 /*
2 * MIDI byte <-> sequencer event coder
3 *
4 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
5 * Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23 #include <linux/slab.h>
24 #include <linux/errno.h>
25 #include <linux/string.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@suse.cz>");
32 MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
33 MODULE_LICENSE("GPL");
34
35 /* queue type */
36 /* from 0 to 7 are normal commands (note off, on, etc.) */
37 #define ST_NOTEOFF 0
38 #define ST_NOTEON 1
39 #define ST_SPECIAL 8
40 #define ST_SYSEX ST_SPECIAL
41 /* from 8 to 15 are events for 0xf0-0xf7 */
42
43
44 /* status event types */
45 typedef void (*event_encode_t)(snd_midi_event_t *dev, snd_seq_event_t *ev);
46 typedef void (*event_decode_t)(snd_seq_event_t *ev, unsigned char *buf);
47
48 /*
49 * prototypes
50 */
51 static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
52 static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
53 static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
54 static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
55 static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
56 static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
57 static void note_decode(snd_seq_event_t *ev, unsigned char *buf);
58 static void one_param_decode(snd_seq_event_t *ev, unsigned char *buf);
59 static void pitchbend_decode(snd_seq_event_t *ev, unsigned char *buf);
60 static void two_param_decode(snd_seq_event_t *ev, unsigned char *buf);
61 static void songpos_decode(snd_seq_event_t *ev, unsigned char *buf);
62
63 /*
64 * event list
65 */
66 static struct status_event_list_t {
67 int event;
68 int qlen;
69 event_encode_t encode;
70 event_decode_t decode;
71 } status_event[] = {
72 /* 0x80 - 0xf0 */
73 {SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
74 {SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
75 {SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
76 {SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
77 {SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
78 {SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
79 {SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
80 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf0 */
81 /* 0xf0 - 0xff */
82 {SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
83 {SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
84 {SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
85 {SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
86 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */
87 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
88 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
89 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
90 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
91 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */
92 {SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
93 {SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
94 {SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
95 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */
96 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
97 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
98 };
99
100 static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int len, snd_seq_event_t *ev);
101 static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *ev);
102
103 static struct extra_event_list_t {
104 int event;
105 int (*decode)(snd_midi_event_t *dev, unsigned char *buf, int len, snd_seq_event_t *ev);
106 } extra_event[] = {
107 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
108 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
109 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
110 };
111
112 /*
113 * new/delete record
114 */
115
116 int snd_midi_event_new(int bufsize, snd_midi_event_t **rdev)
117 {
118 snd_midi_event_t *dev;
119
120 *rdev = NULL;
121 dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);
122 if (dev == NULL)
123 return -ENOMEM;
124 if (bufsize > 0) {
125 dev->buf = kmalloc(bufsize, GFP_KERNEL);
126 if (dev->buf == NULL) {
127 kfree(dev);
128 return -ENOMEM;
129 }
130 }
131 dev->bufsize = bufsize;
132 dev->lastcmd = 0xff;
133 spin_lock_init(&dev->lock);
134 *rdev = dev;
135 return 0;
136 }
137
138 void snd_midi_event_free(snd_midi_event_t *dev)
139 {
140 if (dev != NULL) {
141 kfree(dev->buf);
142 kfree(dev);
143 }
144 }
145
146 /*
147 * initialize record
148 */
149 inline static void reset_encode(snd_midi_event_t *dev)
150 {
151 dev->read = 0;
152 dev->qlen = 0;
153 dev->type = 0;
154 }
155
156 void snd_midi_event_reset_encode(snd_midi_event_t *dev)
157 {
158 unsigned long flags;
159
160 spin_lock_irqsave(&dev->lock, flags);
161 reset_encode(dev);
162 spin_unlock_irqrestore(&dev->lock, flags);
163 }
164
165 void snd_midi_event_reset_decode(snd_midi_event_t *dev)
166 {
167 unsigned long flags;
168
169 spin_lock_irqsave(&dev->lock, flags);
170 dev->lastcmd = 0xff;
171 spin_unlock_irqrestore(&dev->lock, flags);
172 }
173
174 #if 0
175 void snd_midi_event_init(snd_midi_event_t *dev)
176 {
177 snd_midi_event_reset_encode(dev);
178 snd_midi_event_reset_decode(dev);
179 }
180 #endif /* 0 */
181
182 void snd_midi_event_no_status(snd_midi_event_t *dev, int on)
183 {
184 dev->nostat = on ? 1 : 0;
185 }
186
187 /*
188 * resize buffer
189 */
190 #if 0
191 int snd_midi_event_resize_buffer(snd_midi_event_t *dev, int bufsize)
192 {
193 unsigned char *new_buf, *old_buf;
194 unsigned long flags;
195
196 if (bufsize == dev->bufsize)
197 return 0;
198 new_buf = kmalloc(bufsize, GFP_KERNEL);
199 if (new_buf == NULL)
200 return -ENOMEM;
201 spin_lock_irqsave(&dev->lock, flags);
202 old_buf = dev->buf;
203 dev->buf = new_buf;
204 dev->bufsize = bufsize;
205 reset_encode(dev);
206 spin_unlock_irqrestore(&dev->lock, flags);
207 kfree(old_buf);
208 return 0;
209 }
210 #endif /* 0 */
211
212 /*
213 * read bytes and encode to sequencer event if finished
214 * return the size of encoded bytes
215 */
216 long snd_midi_event_encode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *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(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
242 {
243 int rc = 0;
244 unsigned long flags;
245
246 c &= 0xff;
247
248 if (c >= MIDI_CMD_COMMON_CLOCK) {
249 /* real-time event */
250 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
251 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
252 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
253 return 1;
254 }
255
256 spin_lock_irqsave(&dev->lock, flags);
257 if (dev->qlen > 0) {
258 /* rest of command */
259 dev->buf[dev->read++] = c;
260 if (dev->type != ST_SYSEX)
261 dev->qlen--;
262 } else {
263 /* new command */
264 dev->read = 1;
265 if (c & 0x80) {
266 dev->buf[0] = c;
267 if ((c & 0xf0) == 0xf0) /* special events */
268 dev->type = (c & 0x0f) + ST_SPECIAL;
269 else
270 dev->type = (c >> 4) & 0x07;
271 dev->qlen = status_event[dev->type].qlen;
272 } else {
273 /* process this byte as argument */
274 dev->buf[dev->read++] = c;
275 dev->qlen = status_event[dev->type].qlen - 1;
276 }
277 }
278 if (dev->qlen == 0) {
279 ev->type = status_event[dev->type].event;
280 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
281 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
282 if (status_event[dev->type].encode) /* set data values */
283 status_event[dev->type].encode(dev, ev);
284 rc = 1;
285 } else if (dev->type == ST_SYSEX) {
286 if (c == MIDI_CMD_COMMON_SYSEX_END ||
287 dev->read >= dev->bufsize) {
288 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
289 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
290 ev->type = SNDRV_SEQ_EVENT_SYSEX;
291 ev->data.ext.len = dev->read;
292 ev->data.ext.ptr = dev->buf;
293 if (c != MIDI_CMD_COMMON_SYSEX_END)
294 dev->read = 0; /* continue to parse */
295 else
296 reset_encode(dev); /* all parsed */
297 rc = 1;
298 }
299 }
300
301 spin_unlock_irqrestore(&dev->lock, flags);
302 return rc;
303 }
304
305 /* encode note event */
306 static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
307 {
308 ev->data.note.channel = dev->buf[0] & 0x0f;
309 ev->data.note.note = dev->buf[1];
310 ev->data.note.velocity = dev->buf[2];
311 }
312
313 /* encode one parameter controls */
314 static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
315 {
316 ev->data.control.channel = dev->buf[0] & 0x0f;
317 ev->data.control.value = dev->buf[1];
318 }
319
320 /* encode pitch wheel change */
321 static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
322 {
323 ev->data.control.channel = dev->buf[0] & 0x0f;
324 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
325 }
326
327 /* encode midi control change */
328 static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
329 {
330 ev->data.control.channel = dev->buf[0] & 0x0f;
331 ev->data.control.param = dev->buf[1];
332 ev->data.control.value = dev->buf[2];
333 }
334
335 /* encode one parameter value*/
336 static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
337 {
338 ev->data.control.value = dev->buf[1];
339 }
340
341 /* encode song position */
342 static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
343 {
344 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
345 }
346
347 /*
348 * decode from a sequencer event to midi bytes
349 * return the size of decoded midi events
350 */
351 long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *ev)
352 {
353 unsigned int cmd, type;
354
355 if (ev->type == SNDRV_SEQ_EVENT_NONE)
356 return -ENOENT;
357
358 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
359 if (ev->type == status_event[type].event)
360 goto __found;
361 }
362 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
363 if (ev->type == extra_event[type].event)
364 return extra_event[type].decode(dev, buf, count, ev);
365 }
366 return -ENOENT;
367
368 __found:
369 if (type >= ST_SPECIAL)
370 cmd = 0xf0 + (type - ST_SPECIAL);
371 else
372 /* data.note.channel and data.control.channel is identical */
373 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
374
375
376 if (cmd == MIDI_CMD_COMMON_SYSEX) {
377 snd_midi_event_reset_decode(dev);
378 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
379 } else {
380 int qlen;
381 unsigned char xbuf[4];
382 unsigned long flags;
383
384 spin_lock_irqsave(&dev->lock, flags);
385 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
386 dev->lastcmd = cmd;
387 spin_unlock_irqrestore(&dev->lock, flags);
388 xbuf[0] = cmd;
389 if (status_event[type].decode)
390 status_event[type].decode(ev, xbuf + 1);
391 qlen = status_event[type].qlen + 1;
392 } else {
393 spin_unlock_irqrestore(&dev->lock, flags);
394 if (status_event[type].decode)
395 status_event[type].decode(ev, xbuf + 0);
396 qlen = status_event[type].qlen;
397 }
398 if (count < qlen)
399 return -ENOMEM;
400 memcpy(buf, xbuf, qlen);
401 return qlen;
402 }
403 }
404
405
406 /* decode note event */
407 static void note_decode(snd_seq_event_t *ev, unsigned char *buf)
408 {
409 buf[0] = ev->data.note.note & 0x7f;
410 buf[1] = ev->data.note.velocity & 0x7f;
411 }
412
413 /* decode one parameter controls */
414 static void one_param_decode(snd_seq_event_t *ev, unsigned char *buf)
415 {
416 buf[0] = ev->data.control.value & 0x7f;
417 }
418
419 /* decode pitch wheel change */
420 static void pitchbend_decode(snd_seq_event_t *ev, unsigned char *buf)
421 {
422 int value = ev->data.control.value + 8192;
423 buf[0] = value & 0x7f;
424 buf[1] = (value >> 7) & 0x7f;
425 }
426
427 /* decode midi control change */
428 static void two_param_decode(snd_seq_event_t *ev, unsigned char *buf)
429 {
430 buf[0] = ev->data.control.param & 0x7f;
431 buf[1] = ev->data.control.value & 0x7f;
432 }
433
434 /* decode song position */
435 static void songpos_decode(snd_seq_event_t *ev, unsigned char *buf)
436 {
437 buf[0] = ev->data.control.value & 0x7f;
438 buf[1] = (ev->data.control.value >> 7) & 0x7f;
439 }
440
441 /* decode 14bit control */
442 static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *ev)
443 {
444 unsigned char cmd;
445 int idx = 0;
446
447 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
448 if (ev->data.control.param < 0x20) {
449 if (count < 4)
450 return -ENOMEM;
451 if (dev->nostat && count < 6)
452 return -ENOMEM;
453 if (cmd != dev->lastcmd || dev->nostat) {
454 if (count < 5)
455 return -ENOMEM;
456 buf[idx++] = dev->lastcmd = cmd;
457 }
458 buf[idx++] = ev->data.control.param;
459 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
460 if (dev->nostat)
461 buf[idx++] = cmd;
462 buf[idx++] = ev->data.control.param + 0x20;
463 buf[idx++] = ev->data.control.value & 0x7f;
464 } else {
465 if (count < 2)
466 return -ENOMEM;
467 if (cmd != dev->lastcmd || dev->nostat) {
468 if (count < 3)
469 return -ENOMEM;
470 buf[idx++] = dev->lastcmd = cmd;
471 }
472 buf[idx++] = ev->data.control.param & 0x7f;
473 buf[idx++] = ev->data.control.value & 0x7f;
474 }
475 return idx;
476 }
477
478 /* decode reg/nonreg param */
479 static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *ev)
480 {
481 unsigned char cmd;
482 char *cbytes;
483 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
484 MIDI_CTL_NONREG_PARM_NUM_LSB,
485 MIDI_CTL_MSB_DATA_ENTRY,
486 MIDI_CTL_LSB_DATA_ENTRY };
487 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
488 MIDI_CTL_REGIST_PARM_NUM_LSB,
489 MIDI_CTL_MSB_DATA_ENTRY,
490 MIDI_CTL_LSB_DATA_ENTRY };
491 unsigned char bytes[4];
492 int idx = 0, i;
493
494 if (count < 8)
495 return -ENOMEM;
496 if (dev->nostat && count < 12)
497 return -ENOMEM;
498 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
499 bytes[0] = ev->data.control.param & 0x007f;
500 bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
501 bytes[2] = ev->data.control.value & 0x007f;
502 bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
503 if (cmd != dev->lastcmd && !dev->nostat) {
504 if (count < 9)
505 return -ENOMEM;
506 buf[idx++] = dev->lastcmd = cmd;
507 }
508 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
509 for (i = 0; i < 4; i++) {
510 if (dev->nostat)
511 buf[idx++] = dev->lastcmd = cmd;
512 buf[idx++] = cbytes[i];
513 buf[idx++] = bytes[i];
514 }
515 return idx;
516 }
517
518 /*
519 * exports
520 */
521
522 EXPORT_SYMBOL(snd_midi_event_new);
523 EXPORT_SYMBOL(snd_midi_event_free);
524 EXPORT_SYMBOL(snd_midi_event_reset_encode);
525 EXPORT_SYMBOL(snd_midi_event_reset_decode);
526 EXPORT_SYMBOL(snd_midi_event_no_status);
527 EXPORT_SYMBOL(snd_midi_event_encode);
528 EXPORT_SYMBOL(snd_midi_event_encode_byte);
529 EXPORT_SYMBOL(snd_midi_event_decode);
530
531 static int __init alsa_seq_midi_event_init(void)
532 {
533 return 0;
534 }
535
536 static void __exit alsa_seq_midi_event_exit(void)
537 {
538 }
539
540 module_init(alsa_seq_midi_event_init)
541 module_exit(alsa_seq_midi_event_exit)
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