annotate plugin/api/dssi_alsa_compat.c @ 389:a1b6d2e33cab

* document library dependencies * remove dependency of transform on audioio
author Chris Cannam
date Thu, 13 Mar 2008 10:12:14 +0000 (2008-03-13)
parents da6937383da8
children d7f3dfe6f9a4
rev   line source
Chris@0 1 /* DSSI ALSA compatibility library
Chris@0 2 *
Chris@0 3 * This library provides for non-ALSA systems the ALSA snd_seq_event_t handling
Chris@0 4 * necessary to compile and run DSSI. It was extracted from alsa-lib 1.0.8.
Chris@0 5 *
Chris@0 6 * See ./alsa/README for more information.
Chris@0 7 */
Chris@0 8
Chris@0 9 #include <stdlib.h>
Chris@0 10 #include <errno.h>
Chris@0 11
Chris@0 12 #include "alsa/asoundef.h"
Chris@0 13 #include "alsa/sound/asequencer.h"
Chris@0 14 #include "alsa/seq.h"
Chris@0 15 #include "alsa/seq_event.h"
Chris@0 16 #include "alsa/seq_midi_event.h"
Chris@0 17
Chris@0 18 /**
Chris@0 19 * \file seq/seq_event.c
Chris@0 20 * \brief Sequencer Event Types
Chris@0 21 * \author Takashi Iwai <tiwai@suse.de>
Chris@0 22 * \date 2001
Chris@0 23 */
Chris@0 24
Chris@0 25 #define FIXED_EV(x) (_SND_SEQ_TYPE(SND_SEQ_EVFLG_FIXED) | _SND_SEQ_TYPE(x))
Chris@0 26
Chris@0 27 /** Event types conversion array */
Chris@0 28 const unsigned int snd_seq_event_types[256] = {
Chris@0 29 [SND_SEQ_EVENT_SYSTEM ... SND_SEQ_EVENT_RESULT]
Chris@0 30 = FIXED_EV(SND_SEQ_EVFLG_RESULT),
Chris@0 31 [SND_SEQ_EVENT_NOTE]
Chris@0 32 = FIXED_EV(SND_SEQ_EVFLG_NOTE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_NOTE_TWOARG),
Chris@0 33 [SND_SEQ_EVENT_NOTEON ... SND_SEQ_EVENT_KEYPRESS]
Chris@0 34 = FIXED_EV(SND_SEQ_EVFLG_NOTE),
Chris@0 35 [SND_SEQ_EVENT_CONTROLLER ... SND_SEQ_EVENT_REGPARAM]
Chris@0 36 = FIXED_EV(SND_SEQ_EVFLG_CONTROL),
Chris@0 37 [SND_SEQ_EVENT_START ... SND_SEQ_EVENT_STOP]
Chris@0 38 = FIXED_EV(SND_SEQ_EVFLG_QUEUE),
Chris@0 39 [SND_SEQ_EVENT_SETPOS_TICK]
Chris@0 40 = FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TICK),
Chris@0 41 [SND_SEQ_EVENT_SETPOS_TIME]
Chris@0 42 = FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TIME),
Chris@0 43 [SND_SEQ_EVENT_TEMPO ... SND_SEQ_EVENT_SYNC_POS]
Chris@0 44 = FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_VALUE),
Chris@0 45 [SND_SEQ_EVENT_TUNE_REQUEST ... SND_SEQ_EVENT_SENSING]
Chris@0 46 = FIXED_EV(SND_SEQ_EVFLG_NONE),
Chris@0 47 [SND_SEQ_EVENT_ECHO ... SND_SEQ_EVENT_OSS]
Chris@0 48 = FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_SYSTEM),
Chris@0 49 [SND_SEQ_EVENT_CLIENT_START ... SND_SEQ_EVENT_PORT_CHANGE]
Chris@0 50 = FIXED_EV(SND_SEQ_EVFLG_MESSAGE),
Chris@0 51 [SND_SEQ_EVENT_PORT_SUBSCRIBED ... SND_SEQ_EVENT_PORT_UNSUBSCRIBED]
Chris@0 52 = FIXED_EV(SND_SEQ_EVFLG_CONNECTION),
Chris@0 53 [SND_SEQ_EVENT_SAMPLE ... SND_SEQ_EVENT_SAMPLE_PRIVATE1]
Chris@0 54 = FIXED_EV(SND_SEQ_EVFLG_SAMPLE),
Chris@0 55 [SND_SEQ_EVENT_USR0 ... SND_SEQ_EVENT_USR9]
Chris@0 56 = FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_USERS),
Chris@0 57 [SND_SEQ_EVENT_INSTR_BEGIN ... SND_SEQ_EVENT_INSTR_CHANGE]
Chris@0 58 = _SND_SEQ_TYPE(SND_SEQ_EVFLG_INSTR) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARUSR),
Chris@0 59 [SND_SEQ_EVENT_SYSEX ... SND_SEQ_EVENT_BOUNCE]
Chris@0 60 = _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE),
Chris@0 61 [SND_SEQ_EVENT_USR_VAR0 ... SND_SEQ_EVENT_USR_VAR4]
Chris@0 62 = _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_USERS),
Chris@0 63 [SND_SEQ_EVENT_NONE]
Chris@0 64 = FIXED_EV(SND_SEQ_EVFLG_NONE),
Chris@0 65 };
Chris@0 66
Chris@0 67 /**
Chris@0 68 * \file seq/seq_midi_event.c
Chris@0 69 * \brief MIDI byte <-> sequencer event coder
Chris@0 70 * \author Takashi Iwai <tiwai@suse.de>
Chris@0 71 * \author Jaroslav Kysela <perex@suse.cz>
Chris@0 72 * \date 2000-2001
Chris@0 73 */
Chris@0 74
Chris@0 75 /*
Chris@0 76 * MIDI byte <-> sequencer event coder
Chris@0 77 *
Chris@0 78 * Copyright (C) 1998,99,2000 Takashi Iwai <tiwai@suse.de>,
Chris@0 79 * Jaroslav Kysela <perex@suse.cz>
Chris@0 80 *
Chris@0 81 *
Chris@0 82 * This library is free software; you can redistribute it and/or modify
Chris@0 83 * it under the terms of the GNU Lesser General Public License as
Chris@0 84 * published by the Free Software Foundation; either version 2.1 of
Chris@0 85 * the License, or (at your option) any later version.
Chris@0 86 *
Chris@0 87 * This program is distributed in the hope that it will be useful,
Chris@0 88 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@0 89 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Chris@0 90 * GNU Lesser General Public License for more details.
Chris@0 91 *
Chris@0 92 * You should have received a copy of the GNU Lesser General Public
Chris@0 93 * License along with this library; if not, write to the Free Software
Chris@0 94 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Chris@0 95 */
Chris@0 96
Chris@0 97 /* midi status */
Chris@0 98 struct snd_midi_event {
Chris@0 99 size_t qlen; /* queue length */
Chris@0 100 size_t read; /* chars read */
Chris@0 101 int type; /* current event type */
Chris@0 102 unsigned char lastcmd;
Chris@0 103 unsigned char nostat;
Chris@0 104 size_t bufsize;
Chris@0 105 unsigned char *buf; /* input buffer */
Chris@0 106 };
Chris@0 107
Chris@0 108
Chris@0 109 /* queue type */
Chris@0 110 /* from 0 to 7 are normal commands (note off, on, etc.) */
Chris@0 111 #define ST_NOTEOFF 0
Chris@0 112 #define ST_NOTEON 1
Chris@0 113 #define ST_SPECIAL 8
Chris@0 114 #define ST_SYSEX ST_SPECIAL
Chris@0 115 /* from 8 to 15 are events for 0xf0-0xf7 */
Chris@0 116
Chris@0 117
Chris@0 118 /* status event types */
Chris@0 119 typedef void (*event_encode_t)(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 120 typedef void (*event_decode_t)(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0 121
Chris@0 122 /*
Chris@0 123 * prototypes
Chris@0 124 */
Chris@0 125 static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 126 static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 127 static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 128 static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 129 static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 130 static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0 131 static void note_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0 132 static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0 133 static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0 134 static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0 135 static void songpos_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0 136
Chris@0 137 /*
Chris@0 138 * event list
Chris@0 139 */
Chris@0 140 static struct status_event_list_t {
Chris@0 141 int event;
Chris@0 142 int qlen;
Chris@0 143 event_encode_t encode;
Chris@0 144 event_decode_t decode;
Chris@0 145 } status_event[] = {
Chris@0 146 /* 0x80 - 0xf0 */
Chris@0 147 {SND_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
Chris@0 148 {SND_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
Chris@0 149 {SND_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
Chris@0 150 {SND_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
Chris@0 151 {SND_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
Chris@0 152 {SND_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
Chris@0 153 {SND_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
Chris@0 154 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf0 */
Chris@0 155 /* 0xf0 - 0xff */
Chris@0 156 {SND_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
Chris@0 157 {SND_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
Chris@0 158 {SND_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
Chris@0 159 {SND_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
Chris@0 160 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */
Chris@0 161 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
Chris@0 162 {SND_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
Chris@0 163 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
Chris@0 164 {SND_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
Chris@0 165 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */
Chris@0 166 {SND_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
Chris@0 167 {SND_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
Chris@0 168 {SND_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
Chris@0 169 {SND_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */
Chris@0 170 {SND_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
Chris@0 171 {SND_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
Chris@0 172 };
Chris@0 173
Chris@0 174 #ifdef UNNEEDED_BY_DSSI
Chris@0 175 static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
Chris@0 176 static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev);
Chris@0 177
Chris@0 178 static struct extra_event_list_t {
Chris@0 179 int event;
Chris@0 180 int (*decode)(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
Chris@0 181 } extra_event[] = {
Chris@0 182 {SND_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
Chris@0 183 {SND_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
Chris@0 184 {SND_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
Chris@0 185 };
Chris@0 186
Chris@0 187 #define numberof(ary) (sizeof(ary)/sizeof(ary[0]))
Chris@0 188 #endif /* UNNEEDED_BY_DSSI */
Chris@0 189
Chris@0 190 /**
Chris@0 191 * \brief Initialize MIDI event parser
Chris@0 192 * \param bufsize buffer size for MIDI message
Chris@0 193 * \param rdev allocated MIDI event parser
Chris@0 194 * \return 0 on success otherwise a negative error code
Chris@0 195 *
Chris@0 196 * Allocates and initializes MIDI event parser.
Chris@0 197 */
Chris@0 198 int snd_midi_event_new(size_t bufsize, snd_midi_event_t **rdev)
Chris@0 199 {
Chris@0 200 snd_midi_event_t *dev;
Chris@0 201
Chris@0 202 *rdev = NULL;
Chris@0 203 dev = (snd_midi_event_t *)calloc(1, sizeof(snd_midi_event_t));
Chris@0 204 if (dev == NULL)
Chris@0 205 return -ENOMEM;
Chris@0 206 if (bufsize > 0) {
Chris@0 207 dev->buf = malloc(bufsize);
Chris@0 208 if (dev->buf == NULL) {
Chris@0 209 free(dev);
Chris@0 210 return -ENOMEM;
Chris@0 211 }
Chris@0 212 }
Chris@0 213 dev->bufsize = bufsize;
Chris@0 214 dev->lastcmd = 0xff;
Chris@0 215 *rdev = dev;
Chris@0 216 return 0;
Chris@0 217 }
Chris@0 218
Chris@0 219 /**
Chris@0 220 * \brief Free MIDI event parser
Chris@0 221 * \param rdev MIDI event parser
Chris@0 222 * \return 0 on success otherwise a negative error code
Chris@0 223 *
Chris@0 224 * Frees MIDI event parser.
Chris@0 225 */
Chris@0 226 void snd_midi_event_free(snd_midi_event_t *dev)
Chris@0 227 {
Chris@0 228 if (dev != NULL) {
Chris@0 229 if (dev->buf)
Chris@0 230 free(dev->buf);
Chris@0 231 free(dev);
Chris@0 232 }
Chris@0 233 }
Chris@0 234
Chris@0 235 #ifdef UNNEEDED_BY_DSSI
Chris@0 236 /**
Chris@0 237 * \brief Enable/disable MIDI command merging
Chris@0 238 * \param dev MIDI event parser
Chris@0 239 * \param on 0 - enable MIDI command merging, 1 - always pass the command
Chris@0 240 *
Chris@0 241 * Enable/disable MIDI command merging
Chris@0 242 */
Chris@0 243 void snd_midi_event_no_status(snd_midi_event_t *dev, int on)
Chris@0 244 {
Chris@0 245 dev->nostat = on ? 1 : 0;
Chris@0 246 }
Chris@0 247 #endif /* UNNEEDED_BY_DSSI */
Chris@0 248
Chris@0 249 /*
Chris@0 250 * initialize record
Chris@0 251 */
Chris@0 252 inline static void reset_encode(snd_midi_event_t *dev)
Chris@0 253 {
Chris@0 254 dev->read = 0;
Chris@0 255 dev->qlen = 0;
Chris@0 256 dev->type = 0;
Chris@0 257 }
Chris@0 258
Chris@0 259 /**
Chris@0 260 * \brief Reset MIDI encode parser
Chris@0 261 * \param dev MIDI event parser
Chris@0 262 * \return 0 on success otherwise a negative error code
Chris@0 263 *
Chris@0 264 * Resets MIDI encode parser
Chris@0 265 */
Chris@0 266 void snd_midi_event_reset_encode(snd_midi_event_t *dev)
Chris@0 267 {
Chris@0 268 reset_encode(dev);
Chris@0 269 }
Chris@0 270
Chris@0 271 #ifdef UNNEEDED_BY_DSSI
Chris@0 272 /**
Chris@0 273 * \brief Reset MIDI decode parser
Chris@0 274 * \param dev MIDI event parser
Chris@0 275 * \return 0 on success otherwise a negative error code
Chris@0 276 *
Chris@0 277 * Resets MIDI decode parser
Chris@0 278 */
Chris@0 279 void snd_midi_event_reset_decode(snd_midi_event_t *dev)
Chris@0 280 {
Chris@0 281 dev->lastcmd = 0xff;
Chris@0 282 }
Chris@0 283
Chris@0 284 /**
Chris@0 285 * \brief Initializes MIDI parsers
Chris@0 286 * \param dev MIDI event parser
Chris@0 287 * \return 0 on success otherwise a negative error code
Chris@0 288 *
Chris@0 289 * Initializes MIDI parsers (both encode and decode)
Chris@0 290 */
Chris@0 291 void snd_midi_event_init(snd_midi_event_t *dev)
Chris@0 292 {
Chris@0 293 snd_midi_event_reset_encode(dev);
Chris@0 294 snd_midi_event_reset_decode(dev);
Chris@0 295 }
Chris@0 296
Chris@0 297 /**
Chris@0 298 * \brief Resize MIDI message (event) buffer
Chris@0 299 * \param dev MIDI event parser
Chris@0 300 * \param bufsize new requested buffer size
Chris@0 301 * \return 0 on success otherwise a negative error code
Chris@0 302 *
Chris@0 303 * Resizes MIDI message (event) buffer.
Chris@0 304 */
Chris@0 305 int snd_midi_event_resize_buffer(snd_midi_event_t *dev, size_t bufsize)
Chris@0 306 {
Chris@0 307 unsigned char *new_buf, *old_buf;
Chris@0 308
Chris@0 309 if (bufsize == dev->bufsize)
Chris@0 310 return 0;
Chris@0 311 new_buf = malloc(bufsize);
Chris@0 312 if (new_buf == NULL)
Chris@0 313 return -ENOMEM;
Chris@0 314 old_buf = dev->buf;
Chris@0 315 dev->buf = new_buf;
Chris@0 316 dev->bufsize = bufsize;
Chris@0 317 reset_encode(dev);
Chris@0 318 if (old_buf)
Chris@0 319 free(old_buf);
Chris@0 320 return 0;
Chris@0 321 }
Chris@0 322 #endif /* UNNEEDED_BY_DSSI */
Chris@0 323
Chris@0 324 /**
Chris@0 325 * \brief Read bytes and encode to sequencer event if finished
Chris@0 326 * \param dev MIDI event parser
Chris@0 327 * \param buf MIDI byte stream
Chris@0 328 * \param count count of bytes of MIDI byte stream to encode
Chris@0 329 * \param ev Result - sequencer event
Chris@0 330 * \return count of encoded bytes otherwise a negative error code
Chris@0 331 *
Chris@0 332 * Read bytes and encode to sequencer event if finished.
Chris@0 333 * If complete sequencer event is available, ev->type is not
Chris@0 334 * equal to #SND_SEQ_EVENT_NONE.
Chris@0 335 */
Chris@0 336 long snd_midi_event_encode(snd_midi_event_t *dev, const unsigned char *buf, long count, snd_seq_event_t *ev)
Chris@0 337 {
Chris@0 338 long result = 0;
Chris@0 339 int rc;
Chris@0 340
Chris@0 341 ev->type = SND_SEQ_EVENT_NONE;
Chris@0 342
Chris@0 343 while (count-- > 0) {
Chris@0 344 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
Chris@0 345 result++;
Chris@0 346 if (rc < 0)
Chris@0 347 return rc;
Chris@0 348 else if (rc > 0)
Chris@0 349 return result;
Chris@0 350 }
Chris@0 351
Chris@0 352 return result;
Chris@0 353 }
Chris@0 354
Chris@0 355 /**
Chris@0 356 * \brief Read one byte and encode to sequencer event if finished
Chris@0 357 * \param dev MIDI event parser
Chris@0 358 * \param c a byte of MIDI stream
Chris@0 359 * \param ev Result - sequencer event
Chris@0 360 * \return 1 - sequencer event is completed, 0 - next byte is required for completion, otherwise a negative error code
Chris@0 361 *
Chris@0 362 * Read byte and encode to sequencer event if finished.
Chris@0 363 */
Chris@0 364 int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
Chris@0 365 {
Chris@0 366 int rc = 0;
Chris@0 367
Chris@0 368 c &= 0xff;
Chris@0 369
Chris@0 370 if (c >= MIDI_CMD_COMMON_CLOCK) {
Chris@0 371 /* real-time event */
Chris@0 372 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
Chris@0 373 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
Chris@0 374 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
Chris@0 375 return 1;
Chris@0 376 }
Chris@0 377
Chris@0 378 if (dev->qlen > 0) {
Chris@0 379 /* rest of command */
Chris@0 380 dev->buf[dev->read++] = c;
Chris@0 381 if (dev->type != ST_SYSEX)
Chris@0 382 dev->qlen--;
Chris@0 383 } else {
Chris@0 384 /* new command */
Chris@0 385 dev->read = 1;
Chris@0 386 if (c & 0x80) {
Chris@0 387 dev->buf[0] = c;
Chris@0 388 if ((c & 0xf0) == 0xf0) /* special events */
Chris@0 389 dev->type = (c & 0x0f) + ST_SPECIAL;
Chris@0 390 else
Chris@0 391 dev->type = (c >> 4) & 0x07;
Chris@0 392 dev->qlen = status_event[dev->type].qlen;
Chris@0 393 } else {
Chris@0 394 /* process this byte as argument */
Chris@0 395 dev->buf[dev->read++] = c;
Chris@0 396 dev->qlen = status_event[dev->type].qlen - 1;
Chris@0 397 }
Chris@0 398 }
Chris@0 399 if (dev->qlen == 0) {
Chris@0 400 ev->type = status_event[dev->type].event;
Chris@0 401 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
Chris@0 402 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
Chris@0 403 if (status_event[dev->type].encode) /* set data values */
Chris@0 404 status_event[dev->type].encode(dev, ev);
Chris@0 405 rc = 1;
Chris@0 406 } else if (dev->type == ST_SYSEX) {
Chris@0 407 if (c == MIDI_CMD_COMMON_SYSEX_END ||
Chris@0 408 dev->read >= dev->bufsize) {
Chris@0 409 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
Chris@0 410 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
Chris@0 411 ev->type = SNDRV_SEQ_EVENT_SYSEX;
Chris@0 412 ev->data.ext.len = dev->read;
Chris@0 413 ev->data.ext.ptr = dev->buf;
Chris@0 414 if (c != MIDI_CMD_COMMON_SYSEX_END)
Chris@0 415 dev->read = 0; /* continue to parse */
Chris@0 416 else
Chris@0 417 reset_encode(dev); /* all parsed */
Chris@0 418 rc = 1;
Chris@0 419 }
Chris@0 420 }
Chris@0 421
Chris@0 422 return rc;
Chris@0 423 }
Chris@0 424
Chris@0 425 /* encode note event */
Chris@0 426 static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0 427 {
Chris@0 428 ev->data.note.channel = dev->buf[0] & 0x0f;
Chris@0 429 ev->data.note.note = dev->buf[1];
Chris@0 430 ev->data.note.velocity = dev->buf[2];
Chris@0 431 }
Chris@0 432
Chris@0 433 /* encode one parameter controls */
Chris@0 434 static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0 435 {
Chris@0 436 ev->data.control.channel = dev->buf[0] & 0x0f;
Chris@0 437 ev->data.control.value = dev->buf[1];
Chris@0 438 }
Chris@0 439
Chris@0 440 /* encode pitch wheel change */
Chris@0 441 static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0 442 {
Chris@0 443 ev->data.control.channel = dev->buf[0] & 0x0f;
Chris@0 444 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
Chris@0 445 }
Chris@0 446
Chris@0 447 /* encode midi control change */
Chris@0 448 static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0 449 {
Chris@0 450 ev->data.control.channel = dev->buf[0] & 0x0f;
Chris@0 451 ev->data.control.param = dev->buf[1];
Chris@0 452 ev->data.control.value = dev->buf[2];
Chris@0 453 }
Chris@0 454
Chris@0 455 /* encode one parameter value*/
Chris@0 456 static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0 457 {
Chris@0 458 ev->data.control.value = dev->buf[1];
Chris@0 459 }
Chris@0 460
Chris@0 461 /* encode song position */
Chris@0 462 static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0 463 {
Chris@0 464 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
Chris@0 465 }
Chris@0 466
Chris@0 467 #ifdef UNNEEDED_BY_DSSI
Chris@0 468 /**
Chris@0 469 * \brief Decode sequencer event to MIDI byte stream
Chris@0 470 * \param dev MIDI event parser
Chris@0 471 * \param buf Result - MIDI byte stream
Chris@0 472 * \param count Available bytes in MIDI byte stream
Chris@0 473 * \param ev Event to decode
Chris@0 474 * \return count of decoded bytes otherwise a negative error code
Chris@0 475 *
Chris@0 476 * Decode sequencer event to MIDI byte stream.
Chris@0 477 */
Chris@0 478 long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, const snd_seq_event_t *ev)
Chris@0 479 {
Chris@0 480 int cmd;
Chris@0 481 long qlen;
Chris@0 482 unsigned int type;
Chris@0 483
Chris@0 484 if (ev->type == SNDRV_SEQ_EVENT_NONE)
Chris@0 485 return -ENOENT;
Chris@0 486
Chris@0 487 for (type = 0; type < numberof(status_event); type++) {
Chris@0 488 if (ev->type == status_event[type].event)
Chris@0 489 goto __found;
Chris@0 490 }
Chris@0 491 for (type = 0; type < numberof(extra_event); type++) {
Chris@0 492 if (ev->type == extra_event[type].event)
Chris@0 493 return extra_event[type].decode(dev, buf, count, ev);
Chris@0 494 }
Chris@0 495 return -ENOENT;
Chris@0 496
Chris@0 497 __found:
Chris@0 498 if (type >= ST_SPECIAL)
Chris@0 499 cmd = 0xf0 + (type - ST_SPECIAL);
Chris@0 500 else
Chris@0 501 /* data.note.channel and data.control.channel is identical */
Chris@0 502 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
Chris@0 503
Chris@0 504
Chris@0 505 if (cmd == MIDI_CMD_COMMON_SYSEX) {
Chris@0 506 qlen = ev->data.ext.len;
Chris@0 507 if (count < qlen)
Chris@0 508 return -ENOMEM;
Chris@0 509 switch (ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) {
Chris@0 510 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
Chris@0 511 return -EINVAL; /* invalid event */
Chris@0 512 }
Chris@0 513 memcpy(buf, ev->data.ext.ptr, qlen);
Chris@0 514 return qlen;
Chris@0 515 } else {
Chris@0 516 unsigned char xbuf[4];
Chris@0 517
Chris@0 518 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
Chris@0 519 dev->lastcmd = cmd;
Chris@0 520 xbuf[0] = cmd;
Chris@0 521 if (status_event[type].decode)
Chris@0 522 status_event[type].decode(ev, xbuf + 1);
Chris@0 523 qlen = status_event[type].qlen + 1;
Chris@0 524 } else {
Chris@0 525 if (status_event[type].decode)
Chris@0 526 status_event[type].decode(ev, xbuf + 0);
Chris@0 527 qlen = status_event[type].qlen;
Chris@0 528 }
Chris@0 529 if (count < qlen)
Chris@0 530 return -ENOMEM;
Chris@0 531 memcpy(buf, xbuf, qlen);
Chris@0 532 return qlen;
Chris@0 533 }
Chris@0 534 }
Chris@0 535 #endif /* UNNEEDED_BY_DSSI */
Chris@0 536
Chris@0 537 /* decode note event */
Chris@0 538 static void note_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0 539 {
Chris@0 540 buf[0] = ev->data.note.note & 0x7f;
Chris@0 541 buf[1] = ev->data.note.velocity & 0x7f;
Chris@0 542 }
Chris@0 543
Chris@0 544 /* decode one parameter controls */
Chris@0 545 static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0 546 {
Chris@0 547 buf[0] = ev->data.control.value & 0x7f;
Chris@0 548 }
Chris@0 549
Chris@0 550 /* decode pitch wheel change */
Chris@0 551 static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0 552 {
Chris@0 553 int value = ev->data.control.value + 8192;
Chris@0 554 buf[0] = value & 0x7f;
Chris@0 555 buf[1] = (value >> 7) & 0x7f;
Chris@0 556 }
Chris@0 557
Chris@0 558 /* decode midi control change */
Chris@0 559 static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0 560 {
Chris@0 561 buf[0] = ev->data.control.param & 0x7f;
Chris@0 562 buf[1] = ev->data.control.value & 0x7f;
Chris@0 563 }
Chris@0 564
Chris@0 565 /* decode song position */
Chris@0 566 static void songpos_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0 567 {
Chris@0 568 buf[0] = ev->data.control.value & 0x7f;
Chris@0 569 buf[1] = (ev->data.control.value >> 7) & 0x7f;
Chris@0 570 }
Chris@0 571
Chris@0 572 #ifdef UNNEEDED_BY_DSSI
Chris@0 573 /* decode 14bit control */
Chris@0 574 static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev)
Chris@0 575 {
Chris@0 576 unsigned char cmd;
Chris@0 577 int idx = 0;
Chris@0 578
Chris@0 579 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
Chris@0 580 if (ev->data.control.param < 32) {
Chris@0 581 if (count < 4)
Chris@0 582 return -ENOMEM;
Chris@0 583 if (dev->nostat && count < 6)
Chris@0 584 return -ENOMEM;
Chris@0 585 if (cmd != dev->lastcmd || dev->nostat) {
Chris@0 586 if (count < 5)
Chris@0 587 return -ENOMEM;
Chris@0 588 buf[idx++] = dev->lastcmd = cmd;
Chris@0 589 }
Chris@0 590 buf[idx++] = ev->data.control.param;
Chris@0 591 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
Chris@0 592 if (dev->nostat)
Chris@0 593 buf[idx++] = cmd;
Chris@0 594 buf[idx++] = ev->data.control.param + 32;
Chris@0 595 buf[idx++] = ev->data.control.value & 0x7f;
Chris@0 596 } else {
Chris@0 597 if (count < 2)
Chris@0 598 return -ENOMEM;
Chris@0 599 if (cmd != dev->lastcmd || dev->nostat) {
Chris@0 600 if (count < 3)
Chris@0 601 return -ENOMEM;
Chris@0 602 buf[idx++] = dev->lastcmd = cmd;
Chris@0 603 }
Chris@0 604 buf[idx++] = ev->data.control.param & 0x7f;
Chris@0 605 buf[idx++] = ev->data.control.value & 0x7f;
Chris@0 606 }
Chris@0 607 return idx;
Chris@0 608 }
Chris@0 609
Chris@0 610 /* decode reg/nonreg param */
Chris@0 611 static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev)
Chris@0 612 {
Chris@0 613 unsigned char cmd;
Chris@0 614 char *cbytes;
Chris@0 615 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
Chris@0 616 MIDI_CTL_NONREG_PARM_NUM_LSB,
Chris@0 617 MIDI_CTL_MSB_DATA_ENTRY,
Chris@0 618 MIDI_CTL_LSB_DATA_ENTRY };
Chris@0 619 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
Chris@0 620 MIDI_CTL_REGIST_PARM_NUM_LSB,
Chris@0 621 MIDI_CTL_MSB_DATA_ENTRY,
Chris@0 622 MIDI_CTL_LSB_DATA_ENTRY };
Chris@0 623 unsigned char bytes[4];
Chris@0 624 int idx = 0, i;
Chris@0 625
Chris@0 626 if (count < 8)
Chris@0 627 return -ENOMEM;
Chris@0 628 if (dev->nostat && count < 12)
Chris@0 629 return -ENOMEM;
Chris@0 630 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
Chris@0 631 bytes[0] = ev->data.control.param & 0x007f;
Chris@0 632 bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
Chris@0 633 bytes[2] = ev->data.control.value & 0x007f;
Chris@0 634 bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
Chris@0 635 if (cmd != dev->lastcmd && !dev->nostat) {
Chris@0 636 if (count < 9)
Chris@0 637 return -ENOMEM;
Chris@0 638 buf[idx++] = dev->lastcmd = cmd;
Chris@0 639 }
Chris@0 640 cbytes = ev->type == SND_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
Chris@0 641 for (i = 0; i < 4; i++) {
Chris@0 642 if (dev->nostat)
Chris@0 643 buf[idx++] = dev->lastcmd = cmd;
Chris@0 644 buf[idx++] = cbytes[i];
Chris@0 645 buf[idx++] = bytes[i];
Chris@0 646 }
Chris@0 647 return idx;
Chris@0 648 }
Chris@0 649 #endif /* UNNEEDED_BY_DSSI */