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TOMOYO Linux Cross Reference
Linux/sound/core/seq/seq_midi_event.c

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  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 
138 void snd_midi_event_free(struct snd_midi_event *dev)
139 {
140         if (dev != NULL) {
141                 kfree(dev->buf);
142                 kfree(dev);
143         }
144 }
145 
146 /*
147  * initialize record
148  */
149 static inline void reset_encode(struct snd_midi_event *dev)
150 {
151         dev->read = 0;
152         dev->qlen = 0;
153         dev->type = ST_INVALID;
154 }
155 
156 void snd_midi_event_reset_encode(struct snd_midi_event *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(struct snd_midi_event *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(struct snd_midi_event *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(struct snd_midi_event *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(struct snd_midi_event *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(struct snd_midi_event *dev, unsigned char *buf, long count,
217                            struct snd_seq_event *ev)
218 {
219         long result = 0;
220         int rc;
221 
222         ev->type = SNDRV_SEQ_EVENT_NONE;
223 
224         while (count-- > 0) {
225                 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
226                 result++;
227                 if (rc < 0)
228                         return rc;
229                 else if (rc > 0)
230                         return result;
231         }
232 
233         return result;
234 }
235 
236 /*
237  *  read one byte and encode to sequencer event:
238  *  return 1 if MIDI bytes are encoded to an event
239  *         0 data is not finished
240  *         negative for error
241  */
242 int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
243                                struct snd_seq_event *ev)
244 {
245         int rc = 0;
246         unsigned long flags;
247 
248         c &= 0xff;
249 
250         if (c >= MIDI_CMD_COMMON_CLOCK) {
251                 /* real-time event */
252                 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
253                 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
254                 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
255                 return ev->type != SNDRV_SEQ_EVENT_NONE;
256         }
257 
258         spin_lock_irqsave(&dev->lock, flags);
259         if ((c & 0x80) &&
260             (c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
261                 /* new command */
262                 dev->buf[0] = c;
263                 if ((c & 0xf0) == 0xf0) /* system messages */
264                         dev->type = (c & 0x0f) + ST_SPECIAL;
265                 else
266                         dev->type = (c >> 4) & 0x07;
267                 dev->read = 1;
268                 dev->qlen = status_event[dev->type].qlen;
269         } else {
270                 if (dev->qlen > 0) {
271                         /* rest of command */
272                         dev->buf[dev->read++] = c;
273                         if (dev->type != ST_SYSEX)
274                                 dev->qlen--;
275                 } else {
276                         /* running status */
277                         dev->buf[1] = c;
278                         dev->qlen = status_event[dev->type].qlen - 1;
279                         dev->read = 2;
280                 }
281         }
282         if (dev->qlen == 0) {
283                 ev->type = status_event[dev->type].event;
284                 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
285                 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
286                 if (status_event[dev->type].encode) /* set data values */
287                         status_event[dev->type].encode(dev, ev);
288                 if (dev->type >= ST_SPECIAL)
289                         dev->type = ST_INVALID;
290                 rc = 1;
291         } else  if (dev->type == ST_SYSEX) {
292                 if (c == MIDI_CMD_COMMON_SYSEX_END ||
293                     dev->read >= dev->bufsize) {
294                         ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
295                         ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
296                         ev->type = SNDRV_SEQ_EVENT_SYSEX;
297                         ev->data.ext.len = dev->read;
298                         ev->data.ext.ptr = dev->buf;
299                         if (c != MIDI_CMD_COMMON_SYSEX_END)
300                                 dev->read = 0; /* continue to parse */
301                         else
302                                 reset_encode(dev); /* all parsed */
303                         rc = 1;
304                 }
305         }
306 
307         spin_unlock_irqrestore(&dev->lock, flags);
308         return rc;
309 }
310 
311 /* encode note event */
312 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
313 {
314         ev->data.note.channel = dev->buf[0] & 0x0f;
315         ev->data.note.note = dev->buf[1];
316         ev->data.note.velocity = dev->buf[2];
317 }
318 
319 /* encode one parameter controls */
320 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
321 {
322         ev->data.control.channel = dev->buf[0] & 0x0f;
323         ev->data.control.value = dev->buf[1];
324 }
325 
326 /* encode pitch wheel change */
327 static void pitchbend_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 = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
331 }
332 
333 /* encode midi control change */
334 static void two_param_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.param = dev->buf[1];
338         ev->data.control.value = dev->buf[2];
339 }
340 
341 /* encode one parameter value*/
342 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
343 {
344         ev->data.control.value = dev->buf[1];
345 }
346 
347 /* encode song position */
348 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
349 {
350         ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
351 }
352 
353 /*
354  * decode from a sequencer event to midi bytes
355  * return the size of decoded midi events
356  */
357 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
358                            struct snd_seq_event *ev)
359 {
360         unsigned int cmd, type;
361 
362         if (ev->type == SNDRV_SEQ_EVENT_NONE)
363                 return -ENOENT;
364 
365         for (type = 0; type < ARRAY_SIZE(status_event); type++) {
366                 if (ev->type == status_event[type].event)
367                         goto __found;
368         }
369         for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
370                 if (ev->type == extra_event[type].event)
371                         return extra_event[type].decode(dev, buf, count, ev);
372         }
373         return -ENOENT;
374 
375       __found:
376         if (type >= ST_SPECIAL)
377                 cmd = 0xf0 + (type - ST_SPECIAL);
378         else
379                 /* data.note.channel and data.control.channel is identical */
380                 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
381 
382 
383         if (cmd == MIDI_CMD_COMMON_SYSEX) {
384                 snd_midi_event_reset_decode(dev);
385                 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
386         } else {
387                 int qlen;
388                 unsigned char xbuf[4];
389                 unsigned long flags;
390 
391                 spin_lock_irqsave(&dev->lock, flags);
392                 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
393                         dev->lastcmd = cmd;
394                         spin_unlock_irqrestore(&dev->lock, flags);
395                         xbuf[0] = cmd;
396                         if (status_event[type].decode)
397                                 status_event[type].decode(ev, xbuf + 1);
398                         qlen = status_event[type].qlen + 1;
399                 } else {
400                         spin_unlock_irqrestore(&dev->lock, flags);
401                         if (status_event[type].decode)
402                                 status_event[type].decode(ev, xbuf + 0);
403                         qlen = status_event[type].qlen;
404                 }
405                 if (count < qlen)
406                         return -ENOMEM;
407                 memcpy(buf, xbuf, qlen);
408                 return qlen;
409         }
410 }
411 
412 
413 /* decode note event */
414 static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
415 {
416         buf[0] = ev->data.note.note & 0x7f;
417         buf[1] = ev->data.note.velocity & 0x7f;
418 }
419 
420 /* decode one parameter controls */
421 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
422 {
423         buf[0] = ev->data.control.value & 0x7f;
424 }
425 
426 /* decode pitch wheel change */
427 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
428 {
429         int value = ev->data.control.value + 8192;
430         buf[0] = value & 0x7f;
431         buf[1] = (value >> 7) & 0x7f;
432 }
433 
434 /* decode midi control change */
435 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
436 {
437         buf[0] = ev->data.control.param & 0x7f;
438         buf[1] = ev->data.control.value & 0x7f;
439 }
440 
441 /* decode song position */
442 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
443 {
444         buf[0] = ev->data.control.value & 0x7f;
445         buf[1] = (ev->data.control.value >> 7) & 0x7f;
446 }
447 
448 /* decode 14bit control */
449 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
450                                int count, struct snd_seq_event *ev)
451 {
452         unsigned char cmd;
453         int idx = 0;
454 
455         cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
456         if (ev->data.control.param < 0x20) {
457                 if (count < 4)
458                         return -ENOMEM;
459                 if (dev->nostat && count < 6)
460                         return -ENOMEM;
461                 if (cmd != dev->lastcmd || dev->nostat) {
462                         if (count < 5)
463                                 return -ENOMEM;
464                         buf[idx++] = dev->lastcmd = cmd;
465                 }
466                 buf[idx++] = ev->data.control.param;
467                 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
468                 if (dev->nostat)
469                         buf[idx++] = cmd;
470                 buf[idx++] = ev->data.control.param + 0x20;
471                 buf[idx++] = ev->data.control.value & 0x7f;
472         } else {
473                 if (count < 2)
474                         return -ENOMEM;
475                 if (cmd != dev->lastcmd || dev->nostat) {
476                         if (count < 3)
477                                 return -ENOMEM;
478                         buf[idx++] = dev->lastcmd = cmd;
479                 }
480                 buf[idx++] = ev->data.control.param & 0x7f;
481                 buf[idx++] = ev->data.control.value & 0x7f;
482         }
483         return idx;
484 }
485 
486 /* decode reg/nonreg param */
487 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
488                              int count, struct snd_seq_event *ev)
489 {
490         unsigned char cmd;
491         char *cbytes;
492         static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
493                                        MIDI_CTL_NONREG_PARM_NUM_LSB,
494                                        MIDI_CTL_MSB_DATA_ENTRY,
495                                        MIDI_CTL_LSB_DATA_ENTRY };
496         static char cbytes_rpn[4] =  { MIDI_CTL_REGIST_PARM_NUM_MSB,
497                                        MIDI_CTL_REGIST_PARM_NUM_LSB,
498                                        MIDI_CTL_MSB_DATA_ENTRY,
499                                        MIDI_CTL_LSB_DATA_ENTRY };
500         unsigned char bytes[4];
501         int idx = 0, i;
502 
503         if (count < 8)
504                 return -ENOMEM;
505         if (dev->nostat && count < 12)
506                 return -ENOMEM;
507         cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
508         bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
509         bytes[1] = ev->data.control.param & 0x007f;
510         bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
511         bytes[3] = ev->data.control.value & 0x007f;
512         if (cmd != dev->lastcmd && !dev->nostat) {
513                 if (count < 9)
514                         return -ENOMEM;
515                 buf[idx++] = dev->lastcmd = cmd;
516         }
517         cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
518         for (i = 0; i < 4; i++) {
519                 if (dev->nostat)
520                         buf[idx++] = dev->lastcmd = cmd;
521                 buf[idx++] = cbytes[i];
522                 buf[idx++] = bytes[i];
523         }
524         return idx;
525 }
526 
527 /*
528  *  exports
529  */
530  
531 EXPORT_SYMBOL(snd_midi_event_new);
532 EXPORT_SYMBOL(snd_midi_event_free);
533 EXPORT_SYMBOL(snd_midi_event_reset_encode);
534 EXPORT_SYMBOL(snd_midi_event_reset_decode);
535 EXPORT_SYMBOL(snd_midi_event_no_status);
536 EXPORT_SYMBOL(snd_midi_event_encode);
537 EXPORT_SYMBOL(snd_midi_event_encode_byte);
538 EXPORT_SYMBOL(snd_midi_event_decode);
539 
540 static int __init alsa_seq_midi_event_init(void)
541 {
542         return 0;
543 }
544 
545 static void __exit alsa_seq_midi_event_exit(void)
546 {
547 }
548 
549 module_init(alsa_seq_midi_event_init)
550 module_exit(alsa_seq_midi_event_exit)
551 

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