2 * MIDI byte <-> sequencer event coder
4 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
5 * Jaroslav Kysela <perex@suse.cz>
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.
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.
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
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>
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");
35 /* event type, index into status_event[] */
36 /* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
39 #define ST_SYSEX ST_SPECIAL
40 /* from 8 to 15 are events for 0xf0-0xf7 */
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);
61 static struct status_event_list {
64 void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
65 void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
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},
76 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL},
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, 0, NULL, NULL}, /* 0xf4 */
83 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
84 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
85 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
86 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
87 {SNDRV_SEQ_EVENT_NONE, 0, 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, 0, NULL, NULL}, /* 0xfd */
92 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
93 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
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);
101 static struct extra_event_list {
103 int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
104 struct snd_seq_event *ev);
106 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
107 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
108 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
115 int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
117 struct snd_midi_event *dev;
120 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
124 dev->buf = kmalloc(bufsize, GFP_KERNEL);
125 if (dev->buf == NULL) {
130 dev->bufsize = bufsize;
132 dev->type = ST_INVALID;
133 spin_lock_init(&dev->lock);
138 void snd_midi_event_free(struct snd_midi_event *dev)
149 static inline void reset_encode(struct snd_midi_event *dev)
153 dev->type = ST_INVALID;
156 void snd_midi_event_reset_encode(struct snd_midi_event *dev)
160 spin_lock_irqsave(&dev->lock, flags);
162 spin_unlock_irqrestore(&dev->lock, flags);
165 void snd_midi_event_reset_decode(struct snd_midi_event *dev)
169 spin_lock_irqsave(&dev->lock, flags);
171 spin_unlock_irqrestore(&dev->lock, flags);
175 void snd_midi_event_init(struct snd_midi_event *dev)
177 snd_midi_event_reset_encode(dev);
178 snd_midi_event_reset_decode(dev);
182 void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
184 dev->nostat = on ? 1 : 0;
191 int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
193 unsigned char *new_buf, *old_buf;
196 if (bufsize == dev->bufsize)
198 new_buf = kmalloc(bufsize, GFP_KERNEL);
201 spin_lock_irqsave(&dev->lock, flags);
204 dev->bufsize = bufsize;
206 spin_unlock_irqrestore(&dev->lock, flags);
213 * read bytes and encode to sequencer event if finished
214 * return the size of encoded bytes
216 long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
217 struct snd_seq_event *ev)
222 ev->type = SNDRV_SEQ_EVENT_NONE;
224 while (count-- > 0) {
225 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
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
242 int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
243 struct snd_seq_event *ev)
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;
258 spin_lock_irqsave(&dev->lock, flags);
260 /* rest of command */
261 dev->buf[dev->read++] = c;
262 if (dev->type != ST_SYSEX)
269 if ((c & 0xf0) == 0xf0) /* special events */
270 dev->type = (c & 0x0f) + ST_SPECIAL;
272 dev->type = (c >> 4) & 0x07;
273 dev->qlen = status_event[dev->type].qlen;
275 /* process this byte as argument */
276 dev->buf[dev->read++] = c;
277 dev->qlen = status_event[dev->type].qlen - 1;
280 if (dev->qlen == 0) {
281 ev->type = status_event[dev->type].event;
282 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
283 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
284 if (status_event[dev->type].encode) /* set data values */
285 status_event[dev->type].encode(dev, ev);
286 if (dev->type >= ST_SPECIAL)
287 dev->type = ST_INVALID;
289 } else if (dev->type == ST_SYSEX) {
290 if (c == MIDI_CMD_COMMON_SYSEX_END ||
291 dev->read >= dev->bufsize) {
292 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
293 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
294 ev->type = SNDRV_SEQ_EVENT_SYSEX;
295 ev->data.ext.len = dev->read;
296 ev->data.ext.ptr = dev->buf;
297 if (c != MIDI_CMD_COMMON_SYSEX_END)
298 dev->read = 0; /* continue to parse */
300 reset_encode(dev); /* all parsed */
305 spin_unlock_irqrestore(&dev->lock, flags);
309 /* encode note event */
310 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
312 ev->data.note.channel = dev->buf[0] & 0x0f;
313 ev->data.note.note = dev->buf[1];
314 ev->data.note.velocity = dev->buf[2];
317 /* encode one parameter controls */
318 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
320 ev->data.control.channel = dev->buf[0] & 0x0f;
321 ev->data.control.value = dev->buf[1];
324 /* encode pitch wheel change */
325 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
327 ev->data.control.channel = dev->buf[0] & 0x0f;
328 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
331 /* encode midi control change */
332 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
334 ev->data.control.channel = dev->buf[0] & 0x0f;
335 ev->data.control.param = dev->buf[1];
336 ev->data.control.value = dev->buf[2];
339 /* encode one parameter value*/
340 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
342 ev->data.control.value = dev->buf[1];
345 /* encode song position */
346 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
348 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
352 * decode from a sequencer event to midi bytes
353 * return the size of decoded midi events
355 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
356 struct snd_seq_event *ev)
358 unsigned int cmd, type;
360 if (ev->type == SNDRV_SEQ_EVENT_NONE)
363 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
364 if (ev->type == status_event[type].event)
367 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
368 if (ev->type == extra_event[type].event)
369 return extra_event[type].decode(dev, buf, count, ev);
374 if (type >= ST_SPECIAL)
375 cmd = 0xf0 + (type - ST_SPECIAL);
377 /* data.note.channel and data.control.channel is identical */
378 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
381 if (cmd == MIDI_CMD_COMMON_SYSEX) {
382 snd_midi_event_reset_decode(dev);
383 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
386 unsigned char xbuf[4];
389 spin_lock_irqsave(&dev->lock, flags);
390 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
392 spin_unlock_irqrestore(&dev->lock, flags);
394 if (status_event[type].decode)
395 status_event[type].decode(ev, xbuf + 1);
396 qlen = status_event[type].qlen + 1;
398 spin_unlock_irqrestore(&dev->lock, flags);
399 if (status_event[type].decode)
400 status_event[type].decode(ev, xbuf + 0);
401 qlen = status_event[type].qlen;
405 memcpy(buf, xbuf, qlen);
411 /* decode note event */
412 static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
414 buf[0] = ev->data.note.note & 0x7f;
415 buf[1] = ev->data.note.velocity & 0x7f;
418 /* decode one parameter controls */
419 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
421 buf[0] = ev->data.control.value & 0x7f;
424 /* decode pitch wheel change */
425 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
427 int value = ev->data.control.value + 8192;
428 buf[0] = value & 0x7f;
429 buf[1] = (value >> 7) & 0x7f;
432 /* decode midi control change */
433 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
435 buf[0] = ev->data.control.param & 0x7f;
436 buf[1] = ev->data.control.value & 0x7f;
439 /* decode song position */
440 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
442 buf[0] = ev->data.control.value & 0x7f;
443 buf[1] = (ev->data.control.value >> 7) & 0x7f;
446 /* decode 14bit control */
447 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
448 int count, struct snd_seq_event *ev)
453 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
454 if (ev->data.control.param < 0x20) {
457 if (dev->nostat && count < 6)
459 if (cmd != dev->lastcmd || dev->nostat) {
462 buf[idx++] = dev->lastcmd = cmd;
464 buf[idx++] = ev->data.control.param;
465 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
468 buf[idx++] = ev->data.control.param + 0x20;
469 buf[idx++] = ev->data.control.value & 0x7f;
473 if (cmd != dev->lastcmd || dev->nostat) {
476 buf[idx++] = dev->lastcmd = cmd;
478 buf[idx++] = ev->data.control.param & 0x7f;
479 buf[idx++] = ev->data.control.value & 0x7f;
484 /* decode reg/nonreg param */
485 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
486 int count, struct snd_seq_event *ev)
490 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
491 MIDI_CTL_NONREG_PARM_NUM_LSB,
492 MIDI_CTL_MSB_DATA_ENTRY,
493 MIDI_CTL_LSB_DATA_ENTRY };
494 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
495 MIDI_CTL_REGIST_PARM_NUM_LSB,
496 MIDI_CTL_MSB_DATA_ENTRY,
497 MIDI_CTL_LSB_DATA_ENTRY };
498 unsigned char bytes[4];
503 if (dev->nostat && count < 12)
505 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
506 bytes[0] = ev->data.control.param & 0x007f;
507 bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
508 bytes[2] = ev->data.control.value & 0x007f;
509 bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
510 if (cmd != dev->lastcmd && !dev->nostat) {
513 buf[idx++] = dev->lastcmd = cmd;
515 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
516 for (i = 0; i < 4; i++) {
518 buf[idx++] = dev->lastcmd = cmd;
519 buf[idx++] = cbytes[i];
520 buf[idx++] = bytes[i];
529 EXPORT_SYMBOL(snd_midi_event_new);
530 EXPORT_SYMBOL(snd_midi_event_free);
531 EXPORT_SYMBOL(snd_midi_event_reset_encode);
532 EXPORT_SYMBOL(snd_midi_event_reset_decode);
533 EXPORT_SYMBOL(snd_midi_event_no_status);
534 EXPORT_SYMBOL(snd_midi_event_encode);
535 EXPORT_SYMBOL(snd_midi_event_encode_byte);
536 EXPORT_SYMBOL(snd_midi_event_decode);
538 static int __init alsa_seq_midi_event_init(void)
543 static void __exit alsa_seq_midi_event_exit(void)
547 module_init(alsa_seq_midi_event_init)
548 module_exit(alsa_seq_midi_event_exit)