seq_midi_event.c 15 KB

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