1 /* DSSI ALSA compatibility library
2 *
3 * This library provides for non-ALSA systems the ALSA snd_seq_event_t handling
4 * necessary to compile and run DSSI. It was extracted from alsa-lib 1.0.8.
5 *
6 * See ./alsa/README for more information.
7 */
8
9 #include <stdlib.h>
10 #include <errno.h>
11
12 #include "alsa/asoundef.h"
13 #include "alsa/sound/asequencer.h"
14 #include "alsa/seq.h"
15 #include "alsa/seq_event.h"
16 #include "alsa/seq_midi_event.h"
17
18 /**
19 * \file seq/seq_event.c
20 * \brief Sequencer Event Types
21 * \author Takashi Iwai <tiwai@suse.de>
22 * \date 2001
23 */
24
25 #define FIXED_EV(x) (_SND_SEQ_TYPE(SND_SEQ_EVFLG_FIXED) | _SND_SEQ_TYPE(x))
26
27 /** Event types conversion array */
28 /*
29 const unsigned int snd_seq_event_types[256] = {
30 [SND_SEQ_EVENT_SYSTEM ... SND_SEQ_EVENT_RESULT]
31 = FIXED_EV(SND_SEQ_EVFLG_RESULT),
32 [SND_SEQ_EVENT_NOTE]
33 = FIXED_EV(SND_SEQ_EVFLG_NOTE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_NOTE_TWOARG),
34 [SND_SEQ_EVENT_NOTEON ... SND_SEQ_EVENT_KEYPRESS]
35 = FIXED_EV(SND_SEQ_EVFLG_NOTE),
36 [SND_SEQ_EVENT_CONTROLLER ... SND_SEQ_EVENT_REGPARAM]
37 = FIXED_EV(SND_SEQ_EVFLG_CONTROL),
38 [SND_SEQ_EVENT_START ... SND_SEQ_EVENT_STOP]
39 = FIXED_EV(SND_SEQ_EVFLG_QUEUE),
40 [SND_SEQ_EVENT_SETPOS_TICK]
41 = FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TICK),
42 [SND_SEQ_EVENT_SETPOS_TIME]
43 = FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TIME),
44 [SND_SEQ_EVENT_TEMPO ... SND_SEQ_EVENT_SYNC_POS]
45 = FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_VALUE),
46 [SND_SEQ_EVENT_TUNE_REQUEST ... SND_SEQ_EVENT_SENSING]
47 = FIXED_EV(SND_SEQ_EVFLG_NONE),
48 [SND_SEQ_EVENT_ECHO ... SND_SEQ_EVENT_OSS]
49 = FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_SYSTEM),
50 [SND_SEQ_EVENT_CLIENT_START ... SND_SEQ_EVENT_PORT_CHANGE]
51 = FIXED_EV(SND_SEQ_EVFLG_MESSAGE),
52 [SND_SEQ_EVENT_PORT_SUBSCRIBED ... SND_SEQ_EVENT_PORT_UNSUBSCRIBED]
53 = FIXED_EV(SND_SEQ_EVFLG_CONNECTION),
54 [SND_SEQ_EVENT_SAMPLE ... SND_SEQ_EVENT_SAMPLE_PRIVATE1]
55 = FIXED_EV(SND_SEQ_EVFLG_SAMPLE),
56 [SND_SEQ_EVENT_USR0 ... SND_SEQ_EVENT_USR9]
57 = FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_USERS),
58 [SND_SEQ_EVENT_INSTR_BEGIN ... SND_SEQ_EVENT_INSTR_CHANGE]
59 = _SND_SEQ_TYPE(SND_SEQ_EVFLG_INSTR) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARUSR),
60 [SND_SEQ_EVENT_SYSEX ... SND_SEQ_EVENT_BOUNCE]
61 = _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE),
62 [SND_SEQ_EVENT_USR_VAR0 ... SND_SEQ_EVENT_USR_VAR4]
63 = _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_USERS),
64 [SND_SEQ_EVENT_NONE]
65 = FIXED_EV(SND_SEQ_EVFLG_NONE),
66 };
67 */
68 /**
69 * \file seq/seq_midi_event.c
70 * \brief MIDI byte <-> sequencer event coder
71 * \author Takashi Iwai <tiwai@suse.de>
72 * \author Jaroslav Kysela <perex@suse.cz>
73 * \date 2000-2001
74 */
75
76 /*
77 * MIDI byte <-> sequencer event coder
78 *
79 * Copyright (C) 1998,99,2000 Takashi Iwai <tiwai@suse.de>,
80 * Jaroslav Kysela <perex@suse.cz>
81 *
82 *
83 * This library is free software; you can redistribute it and/or modify
84 * it under the terms of the GNU Lesser General Public License as
85 * published by the Free Software Foundation; either version 2.1 of
86 * the License, or (at your option) any later version.
87 *
88 * This program is distributed in the hope that it will be useful,
89 * but WITHOUT ANY WARRANTY; without even the implied warranty of
90 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
91 * GNU Lesser General Public License for more details.
92 *
93 * You should have received a copy of the GNU Lesser General Public
94 * License along with this library; if not, write to the Free Software
95 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
96 */
97
98 /* midi status */
99 struct snd_midi_event {
100 size_t qlen; /* queue length */
101 size_t read; /* chars read */
102 int type; /* current event type */
103 unsigned char lastcmd;
104 unsigned char nostat;
105 size_t bufsize;
106 unsigned char *buf; /* input buffer */
107 };
108
109
110 /* queue type */
111 /* from 0 to 7 are normal commands (note off, on, etc.) */
112 #define ST_NOTEOFF 0
113 #define ST_NOTEON 1
114 #define ST_SPECIAL 8
115 #define ST_SYSEX ST_SPECIAL
116 /* from 8 to 15 are events for 0xf0-0xf7 */
117
118
119 /* status event types */
120 typedef void (*event_encode_t)(snd_midi_event_t *dev, snd_seq_event_t *ev);
121 typedef void (*event_decode_t)(const snd_seq_event_t *ev, unsigned char *buf);
122
123 /*
124 * prototypes
125 */
126 static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
127 static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
128 static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
129 static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
130 static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
131 static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
132 static void note_decode(const snd_seq_event_t *ev, unsigned char *buf);
133 static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
134 static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf);
135 static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
136 static void songpos_decode(const snd_seq_event_t *ev, unsigned char *buf);
137
138 /*
139 * event list
140 */
141 static struct status_event_list_t {
142 int event;
143 int qlen;
144 event_encode_t encode;
145 event_decode_t decode;
146 } status_event[] = {
147 /* 0x80 - 0xf0 */
148 {SND_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
149 {SND_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
150 {SND_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
151 {SND_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
152 {SND_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
153 {SND_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
154 {SND_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
155 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf0 */
156 /* 0xf0 - 0xff */
157 {SND_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
158 {SND_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
159 {SND_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
160 {SND_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
161 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */
162 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
163 {SND_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
164 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
165 {SND_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
166 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */
167 {SND_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
168 {SND_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
169 {SND_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
170 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */
171 {SND_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
172 {SND_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
173 };
174
175 #ifdef UNNEEDED_BY_DSSI
176 static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
177 static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev);
178
179 static struct extra_event_list_t {
180 int event;
181 int (*decode)(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
182 } extra_event[] = {
183 {SND_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
184 {SND_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
185 {SND_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
186 };
187
188 #define numberof(ary) (sizeof(ary)/sizeof(ary[0]))
189 #endif /* UNNEEDED_BY_DSSI */
190
191 /**
192 * \brief Initialize MIDI event parser
193 * \param bufsize buffer size for MIDI message
194 * \param rdev allocated MIDI event parser
195 * \return 0 on success otherwise a negative error code
196 *
197 * Allocates and initializes MIDI event parser.
198 */
snd_midi_event_new(size_t bufsize,snd_midi_event_t ** rdev)199 int snd_midi_event_new(size_t bufsize, snd_midi_event_t **rdev)
200 {
201 snd_midi_event_t *dev;
202
203 *rdev = NULL;
204 dev = (snd_midi_event_t *)calloc(1, sizeof(snd_midi_event_t));
205 if (dev == NULL)
206 return -ENOMEM;
207 if (bufsize > 0) {
208 dev->buf = malloc(bufsize);
209 if (dev->buf == NULL) {
210 free(dev);
211 return -ENOMEM;
212 }
213 }
214 dev->bufsize = bufsize;
215 dev->lastcmd = 0xff;
216 *rdev = dev;
217 return 0;
218 }
219
220 /**
221 * \brief Free MIDI event parser
222 * \param rdev MIDI event parser
223 * \return 0 on success otherwise a negative error code
224 *
225 * Frees MIDI event parser.
226 */
snd_midi_event_free(snd_midi_event_t * dev)227 void snd_midi_event_free(snd_midi_event_t *dev)
228 {
229 if (dev != NULL) {
230 if (dev->buf)
231 free(dev->buf);
232 free(dev);
233 }
234 }
235
236 #ifdef UNNEEDED_BY_DSSI
237 /**
238 * \brief Enable/disable MIDI command merging
239 * \param dev MIDI event parser
240 * \param on 0 - enable MIDI command merging, 1 - always pass the command
241 *
242 * Enable/disable MIDI command merging
243 */
snd_midi_event_no_status(snd_midi_event_t * dev,int on)244 void snd_midi_event_no_status(snd_midi_event_t *dev, int on)
245 {
246 dev->nostat = on ? 1 : 0;
247 }
248 #endif /* UNNEEDED_BY_DSSI */
249
250 /*
251 * initialize record
252 */
reset_encode(snd_midi_event_t * dev)253 inline static void reset_encode(snd_midi_event_t *dev)
254 {
255 dev->read = 0;
256 dev->qlen = 0;
257 dev->type = 0;
258 }
259
260 /**
261 * \brief Reset MIDI encode parser
262 * \param dev MIDI event parser
263 * \return 0 on success otherwise a negative error code
264 *
265 * Resets MIDI encode parser
266 */
snd_midi_event_reset_encode(snd_midi_event_t * dev)267 void snd_midi_event_reset_encode(snd_midi_event_t *dev)
268 {
269 reset_encode(dev);
270 }
271
272 #ifdef UNNEEDED_BY_DSSI
273 /**
274 * \brief Reset MIDI decode parser
275 * \param dev MIDI event parser
276 * \return 0 on success otherwise a negative error code
277 *
278 * Resets MIDI decode parser
279 */
snd_midi_event_reset_decode(snd_midi_event_t * dev)280 void snd_midi_event_reset_decode(snd_midi_event_t *dev)
281 {
282 dev->lastcmd = 0xff;
283 }
284
285 /**
286 * \brief Initializes MIDI parsers
287 * \param dev MIDI event parser
288 * \return 0 on success otherwise a negative error code
289 *
290 * Initializes MIDI parsers (both encode and decode)
291 */
snd_midi_event_init(snd_midi_event_t * dev)292 void snd_midi_event_init(snd_midi_event_t *dev)
293 {
294 snd_midi_event_reset_encode(dev);
295 snd_midi_event_reset_decode(dev);
296 }
297
298 /**
299 * \brief Resize MIDI message (event) buffer
300 * \param dev MIDI event parser
301 * \param bufsize new requested buffer size
302 * \return 0 on success otherwise a negative error code
303 *
304 * Resizes MIDI message (event) buffer.
305 */
snd_midi_event_resize_buffer(snd_midi_event_t * dev,size_t bufsize)306 int snd_midi_event_resize_buffer(snd_midi_event_t *dev, size_t bufsize)
307 {
308 unsigned char *new_buf, *old_buf;
309
310 if (bufsize == dev->bufsize)
311 return 0;
312 new_buf = malloc(bufsize);
313 if (new_buf == NULL)
314 return -ENOMEM;
315 old_buf = dev->buf;
316 dev->buf = new_buf;
317 dev->bufsize = bufsize;
318 reset_encode(dev);
319 if (old_buf)
320 free(old_buf);
321 return 0;
322 }
323 #endif /* UNNEEDED_BY_DSSI */
324
325 /**
326 * \brief Read bytes and encode to sequencer event if finished
327 * \param dev MIDI event parser
328 * \param buf MIDI byte stream
329 * \param count count of bytes of MIDI byte stream to encode
330 * \param ev Result - sequencer event
331 * \return count of encoded bytes otherwise a negative error code
332 *
333 * Read bytes and encode to sequencer event if finished.
334 * If complete sequencer event is available, ev->type is not
335 * equal to #SND_SEQ_EVENT_NONE.
336 */
snd_midi_event_encode(snd_midi_event_t * dev,const unsigned char * buf,long count,snd_seq_event_t * ev)337 long snd_midi_event_encode(snd_midi_event_t *dev, const unsigned char *buf, long count, snd_seq_event_t *ev)
338 {
339 long result = 0;
340 int rc;
341
342 ev->type = SND_SEQ_EVENT_NONE;
343
344 while (count-- > 0) {
345 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
346 result++;
347 if (rc < 0)
348 return rc;
349 else if (rc > 0)
350 return result;
351 }
352
353 return result;
354 }
355
356 /**
357 * \brief Read one byte and encode to sequencer event if finished
358 * \param dev MIDI event parser
359 * \param c a byte of MIDI stream
360 * \param ev Result - sequencer event
361 * \return 1 - sequencer event is completed, 0 - next byte is required for completion, otherwise a negative error code
362 *
363 * Read byte and encode to sequencer event if finished.
364 */
snd_midi_event_encode_byte(snd_midi_event_t * dev,int c,snd_seq_event_t * ev)365 int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
366 {
367 int rc = 0;
368
369 c &= 0xff;
370
371 if (c >= MIDI_CMD_COMMON_CLOCK) {
372 /* real-time event */
373 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
374 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
375 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
376 return 1;
377 }
378
379 if (dev->qlen > 0) {
380 /* rest of command */
381 dev->buf[dev->read++] = c;
382 if (dev->type != ST_SYSEX)
383 dev->qlen--;
384 } else {
385 /* new command */
386 dev->read = 1;
387 if (c & 0x80) {
388 dev->buf[0] = c;
389 if ((c & 0xf0) == 0xf0) /* special events */
390 dev->type = (c & 0x0f) + ST_SPECIAL;
391 else
392 dev->type = (c >> 4) & 0x07;
393 dev->qlen = status_event[dev->type].qlen;
394 } else {
395 /* process this byte as argument */
396 dev->buf[dev->read++] = c;
397 dev->qlen = status_event[dev->type].qlen - 1;
398 }
399 }
400 if (dev->qlen == 0) {
401 ev->type = status_event[dev->type].event;
402 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
403 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
404 if (status_event[dev->type].encode) /* set data values */
405 status_event[dev->type].encode(dev, ev);
406 rc = 1;
407 } else if (dev->type == ST_SYSEX) {
408 if (c == MIDI_CMD_COMMON_SYSEX_END ||
409 dev->read >= dev->bufsize) {
410 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
411 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
412 ev->type = SNDRV_SEQ_EVENT_SYSEX;
413 ev->data.ext.len = dev->read;
414 ev->data.ext.ptr = dev->buf;
415 if (c != MIDI_CMD_COMMON_SYSEX_END)
416 dev->read = 0; /* continue to parse */
417 else
418 reset_encode(dev); /* all parsed */
419 rc = 1;
420 }
421 }
422
423 return rc;
424 }
425
426 /* encode note event */
note_event(snd_midi_event_t * dev,snd_seq_event_t * ev)427 static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
428 {
429 ev->data.note.channel = dev->buf[0] & 0x0f;
430 ev->data.note.note = dev->buf[1];
431 ev->data.note.velocity = dev->buf[2];
432 }
433
434 /* encode one parameter controls */
one_param_ctrl_event(snd_midi_event_t * dev,snd_seq_event_t * ev)435 static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
436 {
437 ev->data.control.channel = dev->buf[0] & 0x0f;
438 ev->data.control.value = dev->buf[1];
439 }
440
441 /* encode pitch wheel change */
pitchbend_ctrl_event(snd_midi_event_t * dev,snd_seq_event_t * ev)442 static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
443 {
444 ev->data.control.channel = dev->buf[0] & 0x0f;
445 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
446 }
447
448 /* encode midi control change */
two_param_ctrl_event(snd_midi_event_t * dev,snd_seq_event_t * ev)449 static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
450 {
451 ev->data.control.channel = dev->buf[0] & 0x0f;
452 ev->data.control.param = dev->buf[1];
453 ev->data.control.value = dev->buf[2];
454 }
455
456 /* encode one parameter value*/
one_param_event(snd_midi_event_t * dev,snd_seq_event_t * ev)457 static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
458 {
459 ev->data.control.value = dev->buf[1];
460 }
461
462 /* encode song position */
songpos_event(snd_midi_event_t * dev,snd_seq_event_t * ev)463 static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
464 {
465 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
466 }
467
468 #ifdef UNNEEDED_BY_DSSI
469 /**
470 * \brief Decode sequencer event to MIDI byte stream
471 * \param dev MIDI event parser
472 * \param buf Result - MIDI byte stream
473 * \param count Available bytes in MIDI byte stream
474 * \param ev Event to decode
475 * \return count of decoded bytes otherwise a negative error code
476 *
477 * Decode sequencer event to MIDI byte stream.
478 */
snd_midi_event_decode(snd_midi_event_t * dev,unsigned char * buf,long count,const snd_seq_event_t * ev)479 long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, const snd_seq_event_t *ev)
480 {
481 int cmd;
482 long qlen;
483 unsigned int type;
484
485 if (ev->type == SNDRV_SEQ_EVENT_NONE)
486 return -ENOENT;
487
488 for (type = 0; type < numberof(status_event); type++) {
489 if (ev->type == status_event[type].event)
490 goto __found;
491 }
492 for (type = 0; type < numberof(extra_event); type++) {
493 if (ev->type == extra_event[type].event)
494 return extra_event[type].decode(dev, buf, count, ev);
495 }
496 return -ENOENT;
497
498 __found:
499 if (type >= ST_SPECIAL)
500 cmd = 0xf0 + (type - ST_SPECIAL);
501 else
502 /* data.note.channel and data.control.channel is identical */
503 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
504
505
506 if (cmd == MIDI_CMD_COMMON_SYSEX) {
507 qlen = ev->data.ext.len;
508 if (count < qlen)
509 return -ENOMEM;
510 switch (ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) {
511 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
512 return -EINVAL; /* invalid event */
513 }
514 memcpy(buf, ev->data.ext.ptr, qlen);
515 return qlen;
516 } else {
517 unsigned char xbuf[4];
518
519 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
520 dev->lastcmd = cmd;
521 xbuf[0] = cmd;
522 if (status_event[type].decode)
523 status_event[type].decode(ev, xbuf + 1);
524 qlen = status_event[type].qlen + 1;
525 } else {
526 if (status_event[type].decode)
527 status_event[type].decode(ev, xbuf + 0);
528 qlen = status_event[type].qlen;
529 }
530 if (count < qlen)
531 return -ENOMEM;
532 memcpy(buf, xbuf, qlen);
533 return qlen;
534 }
535 }
536 #endif /* UNNEEDED_BY_DSSI */
537
538 /* decode note event */
note_decode(const snd_seq_event_t * ev,unsigned char * buf)539 static void note_decode(const snd_seq_event_t *ev, unsigned char *buf)
540 {
541 buf[0] = ev->data.note.note & 0x7f;
542 buf[1] = ev->data.note.velocity & 0x7f;
543 }
544
545 /* decode one parameter controls */
one_param_decode(const snd_seq_event_t * ev,unsigned char * buf)546 static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf)
547 {
548 buf[0] = ev->data.control.value & 0x7f;
549 }
550
551 /* decode pitch wheel change */
pitchbend_decode(const snd_seq_event_t * ev,unsigned char * buf)552 static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf)
553 {
554 int value = ev->data.control.value + 8192;
555 buf[0] = value & 0x7f;
556 buf[1] = (value >> 7) & 0x7f;
557 }
558
559 /* decode midi control change */
two_param_decode(const snd_seq_event_t * ev,unsigned char * buf)560 static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf)
561 {
562 buf[0] = ev->data.control.param & 0x7f;
563 buf[1] = ev->data.control.value & 0x7f;
564 }
565
566 /* decode song position */
songpos_decode(const snd_seq_event_t * ev,unsigned char * buf)567 static void songpos_decode(const snd_seq_event_t *ev, unsigned char *buf)
568 {
569 buf[0] = ev->data.control.value & 0x7f;
570 buf[1] = (ev->data.control.value >> 7) & 0x7f;
571 }
572
573 #ifdef UNNEEDED_BY_DSSI
574 /* decode 14bit control */
extra_decode_ctrl14(snd_midi_event_t * dev,unsigned char * buf,int count,const snd_seq_event_t * ev)575 static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev)
576 {
577 unsigned char cmd;
578 int idx = 0;
579
580 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
581 if (ev->data.control.param < 32) {
582 if (count < 4)
583 return -ENOMEM;
584 if (dev->nostat && count < 6)
585 return -ENOMEM;
586 if (cmd != dev->lastcmd || dev->nostat) {
587 if (count < 5)
588 return -ENOMEM;
589 buf[idx++] = dev->lastcmd = cmd;
590 }
591 buf[idx++] = ev->data.control.param;
592 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
593 if (dev->nostat)
594 buf[idx++] = cmd;
595 buf[idx++] = ev->data.control.param + 32;
596 buf[idx++] = ev->data.control.value & 0x7f;
597 } else {
598 if (count < 2)
599 return -ENOMEM;
600 if (cmd != dev->lastcmd || dev->nostat) {
601 if (count < 3)
602 return -ENOMEM;
603 buf[idx++] = dev->lastcmd = cmd;
604 }
605 buf[idx++] = ev->data.control.param & 0x7f;
606 buf[idx++] = ev->data.control.value & 0x7f;
607 }
608 return idx;
609 }
610
611 /* decode reg/nonreg param */
extra_decode_xrpn(snd_midi_event_t * dev,unsigned char * buf,int count,const snd_seq_event_t * ev)612 static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev)
613 {
614 unsigned char cmd;
615 char *cbytes;
616 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
617 MIDI_CTL_NONREG_PARM_NUM_LSB,
618 MIDI_CTL_MSB_DATA_ENTRY,
619 MIDI_CTL_LSB_DATA_ENTRY };
620 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
621 MIDI_CTL_REGIST_PARM_NUM_LSB,
622 MIDI_CTL_MSB_DATA_ENTRY,
623 MIDI_CTL_LSB_DATA_ENTRY };
624 unsigned char bytes[4];
625 int idx = 0, i;
626
627 if (count < 8)
628 return -ENOMEM;
629 if (dev->nostat && count < 12)
630 return -ENOMEM;
631 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
632 bytes[0] = ev->data.control.param & 0x007f;
633 bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
634 bytes[2] = ev->data.control.value & 0x007f;
635 bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
636 if (cmd != dev->lastcmd && !dev->nostat) {
637 if (count < 9)
638 return -ENOMEM;
639 buf[idx++] = dev->lastcmd = cmd;
640 }
641 cbytes = ev->type == SND_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
642 for (i = 0; i < 4; i++) {
643 if (dev->nostat)
644 buf[idx++] = dev->lastcmd = cmd;
645 buf[idx++] = cbytes[i];
646 buf[idx++] = bytes[i];
647 }
648 return idx;
649 }
650 #endif /* UNNEEDED_BY_DSSI */
651