1 /* 2 * GM/GS/XG midi module. 3 * 4 * Copyright (C) 1999 Steve Ratcliffe 5 * 6 * Based on awe_wave.c by Takashi Iwai 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 /* 24 * This module is used to keep track of the current midi state. 25 * It can be used for drivers that are required to emulate midi when 26 * the hardware doesn't. 27 * 28 * It was written for a AWE64 driver, but there should be no AWE specific 29 * code in here. If there is it should be reported as a bug. 30 */ 31 32 #include <linux/init.h> 33 #include <linux/slab.h> 34 #include <linux/string.h> 35 #include <linux/module.h> 36 #include <sound/core.h> 37 #include <sound/seq_kernel.h> 38 #include <sound/seq_midi_emul.h> 39 #include <sound/initval.h> 40 #include <sound/asoundef.h> 41 42 MODULE_AUTHOR("Takashi Iwai / Steve Ratcliffe"); 43 MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI emulation."); 44 MODULE_LICENSE("GPL"); 45 46 /* Prototypes for static functions */ 47 static void note_off(struct snd_midi_op *ops, void *drv, 48 struct snd_midi_channel *chan, 49 int note, int vel); 50 static void do_control(struct snd_midi_op *ops, void *private, 51 struct snd_midi_channel_set *chset, 52 struct snd_midi_channel *chan, 53 int control, int value); 54 static void rpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 55 struct snd_midi_channel_set *chset); 56 static void nrpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 57 struct snd_midi_channel_set *chset); 58 static void sysex(struct snd_midi_op *ops, void *private, unsigned char *sysex, 59 int len, struct snd_midi_channel_set *chset); 60 static void all_sounds_off(struct snd_midi_op *ops, void *private, 61 struct snd_midi_channel *chan); 62 static void all_notes_off(struct snd_midi_op *ops, void *private, 63 struct snd_midi_channel *chan); 64 static void snd_midi_reset_controllers(struct snd_midi_channel *chan); 65 static void reset_all_channels(struct snd_midi_channel_set *chset); 66 67 68 /* 69 * Process an event in a driver independent way. This means dealing 70 * with RPN, NRPN, SysEx etc that are defined for common midi applications 71 * such as GM, GS and XG. 72 * There modes that this module will run in are: 73 * Generic MIDI - no interpretation at all, it will just save current values 74 * of controllers etc. 75 * GM - You can use all gm_ prefixed elements of chan. Controls, RPN, NRPN, 76 * SysEx will be interpreded as defined in General Midi. 77 * GS - You can use all gs_ prefixed elements of chan. Codes for GS will be 78 * interpreted. 79 * XG - You can use all xg_ prefixed elements of chan. Codes for XG will 80 * be interpreted. 81 */ 82 void 83 snd_midi_process_event(struct snd_midi_op *ops, 84 struct snd_seq_event *ev, 85 struct snd_midi_channel_set *chanset) 86 { 87 struct snd_midi_channel *chan; 88 void *drv; 89 int dest_channel = 0; 90 91 if (ev == NULL || chanset == NULL) { 92 pr_debug("ALSA: seq_midi_emul: ev or chanbase NULL (snd_midi_process_event)\n"); 93 return; 94 } 95 if (chanset->channels == NULL) 96 return; 97 98 if (snd_seq_ev_is_channel_type(ev)) { 99 dest_channel = ev->data.note.channel; 100 if (dest_channel >= chanset->max_channels) { 101 pr_debug("ALSA: seq_midi_emul: dest channel is %d, max is %d\n", 102 dest_channel, chanset->max_channels); 103 return; 104 } 105 } 106 107 chan = chanset->channels + dest_channel; 108 drv = chanset->private_data; 109 110 /* EVENT_NOTE should be processed before queued */ 111 if (ev->type == SNDRV_SEQ_EVENT_NOTE) 112 return; 113 114 /* Make sure that we don't have a note on that should really be 115 * a note off */ 116 if (ev->type == SNDRV_SEQ_EVENT_NOTEON && ev->data.note.velocity == 0) 117 ev->type = SNDRV_SEQ_EVENT_NOTEOFF; 118 119 /* Make sure the note is within array range */ 120 if (ev->type == SNDRV_SEQ_EVENT_NOTEON || 121 ev->type == SNDRV_SEQ_EVENT_NOTEOFF || 122 ev->type == SNDRV_SEQ_EVENT_KEYPRESS) { 123 if (ev->data.note.note >= 128) 124 return; 125 } 126 127 switch (ev->type) { 128 case SNDRV_SEQ_EVENT_NOTEON: 129 if (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON) { 130 if (ops->note_off) 131 ops->note_off(drv, ev->data.note.note, 0, chan); 132 } 133 chan->note[ev->data.note.note] = SNDRV_MIDI_NOTE_ON; 134 if (ops->note_on) 135 ops->note_on(drv, ev->data.note.note, ev->data.note.velocity, chan); 136 break; 137 case SNDRV_SEQ_EVENT_NOTEOFF: 138 if (! (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON)) 139 break; 140 if (ops->note_off) 141 note_off(ops, drv, chan, ev->data.note.note, ev->data.note.velocity); 142 break; 143 case SNDRV_SEQ_EVENT_KEYPRESS: 144 if (ops->key_press) 145 ops->key_press(drv, ev->data.note.note, ev->data.note.velocity, chan); 146 break; 147 case SNDRV_SEQ_EVENT_CONTROLLER: 148 do_control(ops, drv, chanset, chan, 149 ev->data.control.param, ev->data.control.value); 150 break; 151 case SNDRV_SEQ_EVENT_PGMCHANGE: 152 chan->midi_program = ev->data.control.value; 153 break; 154 case SNDRV_SEQ_EVENT_PITCHBEND: 155 chan->midi_pitchbend = ev->data.control.value; 156 if (ops->control) 157 ops->control(drv, MIDI_CTL_PITCHBEND, chan); 158 break; 159 case SNDRV_SEQ_EVENT_CHANPRESS: 160 chan->midi_pressure = ev->data.control.value; 161 if (ops->control) 162 ops->control(drv, MIDI_CTL_CHAN_PRESSURE, chan); 163 break; 164 case SNDRV_SEQ_EVENT_CONTROL14: 165 /* Best guess is that this is any of the 14 bit controller values */ 166 if (ev->data.control.param < 32) { 167 /* set low part first */ 168 chan->control[ev->data.control.param + 32] = 169 ev->data.control.value & 0x7f; 170 do_control(ops, drv, chanset, chan, 171 ev->data.control.param, 172 ((ev->data.control.value>>7) & 0x7f)); 173 } else 174 do_control(ops, drv, chanset, chan, 175 ev->data.control.param, 176 ev->data.control.value); 177 break; 178 case SNDRV_SEQ_EVENT_NONREGPARAM: 179 /* Break it back into its controller values */ 180 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED; 181 chan->control[MIDI_CTL_MSB_DATA_ENTRY] 182 = (ev->data.control.value >> 7) & 0x7f; 183 chan->control[MIDI_CTL_LSB_DATA_ENTRY] 184 = ev->data.control.value & 0x7f; 185 chan->control[MIDI_CTL_NONREG_PARM_NUM_MSB] 186 = (ev->data.control.param >> 7) & 0x7f; 187 chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB] 188 = ev->data.control.param & 0x7f; 189 nrpn(ops, drv, chan, chanset); 190 break; 191 case SNDRV_SEQ_EVENT_REGPARAM: 192 /* Break it back into its controller values */ 193 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED; 194 chan->control[MIDI_CTL_MSB_DATA_ENTRY] 195 = (ev->data.control.value >> 7) & 0x7f; 196 chan->control[MIDI_CTL_LSB_DATA_ENTRY] 197 = ev->data.control.value & 0x7f; 198 chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] 199 = (ev->data.control.param >> 7) & 0x7f; 200 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB] 201 = ev->data.control.param & 0x7f; 202 rpn(ops, drv, chan, chanset); 203 break; 204 case SNDRV_SEQ_EVENT_SYSEX: 205 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE) { 206 unsigned char sysexbuf[64]; 207 int len; 208 len = snd_seq_expand_var_event(ev, sizeof(sysexbuf), sysexbuf, 1, 0); 209 if (len > 0) 210 sysex(ops, drv, sysexbuf, len, chanset); 211 } 212 break; 213 case SNDRV_SEQ_EVENT_SONGPOS: 214 case SNDRV_SEQ_EVENT_SONGSEL: 215 case SNDRV_SEQ_EVENT_CLOCK: 216 case SNDRV_SEQ_EVENT_START: 217 case SNDRV_SEQ_EVENT_CONTINUE: 218 case SNDRV_SEQ_EVENT_STOP: 219 case SNDRV_SEQ_EVENT_QFRAME: 220 case SNDRV_SEQ_EVENT_TEMPO: 221 case SNDRV_SEQ_EVENT_TIMESIGN: 222 case SNDRV_SEQ_EVENT_KEYSIGN: 223 goto not_yet; 224 case SNDRV_SEQ_EVENT_SENSING: 225 break; 226 case SNDRV_SEQ_EVENT_CLIENT_START: 227 case SNDRV_SEQ_EVENT_CLIENT_EXIT: 228 case SNDRV_SEQ_EVENT_CLIENT_CHANGE: 229 case SNDRV_SEQ_EVENT_PORT_START: 230 case SNDRV_SEQ_EVENT_PORT_EXIT: 231 case SNDRV_SEQ_EVENT_PORT_CHANGE: 232 case SNDRV_SEQ_EVENT_ECHO: 233 not_yet: 234 default: 235 /*pr_debug("ALSA: seq_midi_emul: Unimplemented event %d\n", ev->type);*/ 236 break; 237 } 238 } 239 240 241 /* 242 * release note 243 */ 244 static void 245 note_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 246 int note, int vel) 247 { 248 if (chan->gm_hold) { 249 /* Hold this note until pedal is turned off */ 250 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED; 251 } else if (chan->note[note] & SNDRV_MIDI_NOTE_SOSTENUTO) { 252 /* Mark this note as release; it will be turned off when sostenuto 253 * is turned off */ 254 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED; 255 } else { 256 chan->note[note] = 0; 257 if (ops->note_off) 258 ops->note_off(drv, note, vel, chan); 259 } 260 } 261 262 /* 263 * Do all driver independent operations for this controller and pass 264 * events that need to take place immediately to the driver. 265 */ 266 static void 267 do_control(struct snd_midi_op *ops, void *drv, struct snd_midi_channel_set *chset, 268 struct snd_midi_channel *chan, int control, int value) 269 { 270 int i; 271 272 /* Switches */ 273 if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) { 274 /* These are all switches; either off or on so set to 0 or 127 */ 275 value = (value >= 64)? 127: 0; 276 } 277 chan->control[control] = value; 278 279 switch (control) { 280 case MIDI_CTL_SUSTAIN: 281 if (value == 0) { 282 /* Sustain has been released, turn off held notes */ 283 for (i = 0; i < 128; i++) { 284 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) { 285 chan->note[i] = SNDRV_MIDI_NOTE_OFF; 286 if (ops->note_off) 287 ops->note_off(drv, i, 0, chan); 288 } 289 } 290 } 291 break; 292 case MIDI_CTL_PORTAMENTO: 293 break; 294 case MIDI_CTL_SOSTENUTO: 295 if (value) { 296 /* Mark each note that is currently held down */ 297 for (i = 0; i < 128; i++) { 298 if (chan->note[i] & SNDRV_MIDI_NOTE_ON) 299 chan->note[i] |= SNDRV_MIDI_NOTE_SOSTENUTO; 300 } 301 } else { 302 /* release all notes that were held */ 303 for (i = 0; i < 128; i++) { 304 if (chan->note[i] & SNDRV_MIDI_NOTE_SOSTENUTO) { 305 chan->note[i] &= ~SNDRV_MIDI_NOTE_SOSTENUTO; 306 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) { 307 chan->note[i] = SNDRV_MIDI_NOTE_OFF; 308 if (ops->note_off) 309 ops->note_off(drv, i, 0, chan); 310 } 311 } 312 } 313 } 314 break; 315 case MIDI_CTL_MSB_DATA_ENTRY: 316 chan->control[MIDI_CTL_LSB_DATA_ENTRY] = 0; 317 /* go through here */ 318 case MIDI_CTL_LSB_DATA_ENTRY: 319 if (chan->param_type == SNDRV_MIDI_PARAM_TYPE_REGISTERED) 320 rpn(ops, drv, chan, chset); 321 else 322 nrpn(ops, drv, chan, chset); 323 break; 324 case MIDI_CTL_REGIST_PARM_NUM_LSB: 325 case MIDI_CTL_REGIST_PARM_NUM_MSB: 326 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED; 327 break; 328 case MIDI_CTL_NONREG_PARM_NUM_LSB: 329 case MIDI_CTL_NONREG_PARM_NUM_MSB: 330 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED; 331 break; 332 333 case MIDI_CTL_ALL_SOUNDS_OFF: 334 all_sounds_off(ops, drv, chan); 335 break; 336 337 case MIDI_CTL_ALL_NOTES_OFF: 338 all_notes_off(ops, drv, chan); 339 break; 340 341 case MIDI_CTL_MSB_BANK: 342 if (chset->midi_mode == SNDRV_MIDI_MODE_XG) { 343 if (value == 127) 344 chan->drum_channel = 1; 345 else 346 chan->drum_channel = 0; 347 } 348 break; 349 case MIDI_CTL_LSB_BANK: 350 break; 351 352 case MIDI_CTL_RESET_CONTROLLERS: 353 snd_midi_reset_controllers(chan); 354 break; 355 356 case MIDI_CTL_SOFT_PEDAL: 357 case MIDI_CTL_LEGATO_FOOTSWITCH: 358 case MIDI_CTL_HOLD2: 359 case MIDI_CTL_SC1_SOUND_VARIATION: 360 case MIDI_CTL_SC2_TIMBRE: 361 case MIDI_CTL_SC3_RELEASE_TIME: 362 case MIDI_CTL_SC4_ATTACK_TIME: 363 case MIDI_CTL_SC5_BRIGHTNESS: 364 case MIDI_CTL_E1_REVERB_DEPTH: 365 case MIDI_CTL_E2_TREMOLO_DEPTH: 366 case MIDI_CTL_E3_CHORUS_DEPTH: 367 case MIDI_CTL_E4_DETUNE_DEPTH: 368 case MIDI_CTL_E5_PHASER_DEPTH: 369 goto notyet; 370 notyet: 371 default: 372 if (ops->control) 373 ops->control(drv, control, chan); 374 break; 375 } 376 } 377 378 379 /* 380 * initialize the MIDI status 381 */ 382 void 383 snd_midi_channel_set_clear(struct snd_midi_channel_set *chset) 384 { 385 int i; 386 387 chset->midi_mode = SNDRV_MIDI_MODE_GM; 388 chset->gs_master_volume = 127; 389 390 for (i = 0; i < chset->max_channels; i++) { 391 struct snd_midi_channel *chan = chset->channels + i; 392 memset(chan->note, 0, sizeof(chan->note)); 393 394 chan->midi_aftertouch = 0; 395 chan->midi_pressure = 0; 396 chan->midi_program = 0; 397 chan->midi_pitchbend = 0; 398 snd_midi_reset_controllers(chan); 399 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 400 chan->gm_rpn_fine_tuning = 0; 401 chan->gm_rpn_coarse_tuning = 0; 402 403 if (i == 9) 404 chan->drum_channel = 1; 405 else 406 chan->drum_channel = 0; 407 } 408 } 409 410 /* 411 * Process a rpn message. 412 */ 413 static void 414 rpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 415 struct snd_midi_channel_set *chset) 416 { 417 int type; 418 int val; 419 420 if (chset->midi_mode != SNDRV_MIDI_MODE_NONE) { 421 type = (chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] << 8) | 422 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB]; 423 val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) | 424 chan->control[MIDI_CTL_LSB_DATA_ENTRY]; 425 426 switch (type) { 427 case 0x0000: /* Pitch bend sensitivity */ 428 /* MSB only / 1 semitone per 128 */ 429 chan->gm_rpn_pitch_bend_range = val; 430 break; 431 432 case 0x0001: /* fine tuning: */ 433 /* MSB/LSB, 8192=center, 100/8192 cent step */ 434 chan->gm_rpn_fine_tuning = val - 8192; 435 break; 436 437 case 0x0002: /* coarse tuning */ 438 /* MSB only / 8192=center, 1 semitone per 128 */ 439 chan->gm_rpn_coarse_tuning = val - 8192; 440 break; 441 442 case 0x7F7F: /* "lock-in" RPN */ 443 /* ignored */ 444 break; 445 } 446 } 447 /* should call nrpn or rpn callback here.. */ 448 } 449 450 /* 451 * Process an nrpn message. 452 */ 453 static void 454 nrpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 455 struct snd_midi_channel_set *chset) 456 { 457 /* parse XG NRPNs here if possible */ 458 if (ops->nrpn) 459 ops->nrpn(drv, chan, chset); 460 } 461 462 463 /* 464 * convert channel parameter in GS sysex 465 */ 466 static int 467 get_channel(unsigned char cmd) 468 { 469 int p = cmd & 0x0f; 470 if (p == 0) 471 p = 9; 472 else if (p < 10) 473 p--; 474 return p; 475 } 476 477 478 /* 479 * Process a sysex message. 480 */ 481 static void 482 sysex(struct snd_midi_op *ops, void *private, unsigned char *buf, int len, 483 struct snd_midi_channel_set *chset) 484 { 485 /* GM on */ 486 static unsigned char gm_on_macro[] = { 487 0x7e,0x7f,0x09,0x01, 488 }; 489 /* XG on */ 490 static unsigned char xg_on_macro[] = { 491 0x43,0x10,0x4c,0x00,0x00,0x7e,0x00, 492 }; 493 /* GS prefix 494 * drum channel: XX=0x1?(channel), YY=0x15, ZZ=on/off 495 * reverb mode: XX=0x01, YY=0x30, ZZ=0-7 496 * chorus mode: XX=0x01, YY=0x38, ZZ=0-7 497 * master vol: XX=0x00, YY=0x04, ZZ=0-127 498 */ 499 static unsigned char gs_pfx_macro[] = { 500 0x41,0x10,0x42,0x12,0x40,/*XX,YY,ZZ*/ 501 }; 502 503 int parsed = SNDRV_MIDI_SYSEX_NOT_PARSED; 504 505 if (len <= 0 || buf[0] != 0xf0) 506 return; 507 /* skip first byte */ 508 buf++; 509 len--; 510 511 /* GM on */ 512 if (len >= (int)sizeof(gm_on_macro) && 513 memcmp(buf, gm_on_macro, sizeof(gm_on_macro)) == 0) { 514 if (chset->midi_mode != SNDRV_MIDI_MODE_GS && 515 chset->midi_mode != SNDRV_MIDI_MODE_XG) { 516 chset->midi_mode = SNDRV_MIDI_MODE_GM; 517 reset_all_channels(chset); 518 parsed = SNDRV_MIDI_SYSEX_GM_ON; 519 } 520 } 521 522 /* GS macros */ 523 else if (len >= 8 && 524 memcmp(buf, gs_pfx_macro, sizeof(gs_pfx_macro)) == 0) { 525 if (chset->midi_mode != SNDRV_MIDI_MODE_GS && 526 chset->midi_mode != SNDRV_MIDI_MODE_XG) 527 chset->midi_mode = SNDRV_MIDI_MODE_GS; 528 529 if (buf[5] == 0x00 && buf[6] == 0x7f && buf[7] == 0x00) { 530 /* GS reset */ 531 parsed = SNDRV_MIDI_SYSEX_GS_RESET; 532 reset_all_channels(chset); 533 } 534 535 else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x15) { 536 /* drum pattern */ 537 int p = get_channel(buf[5]); 538 if (p < chset->max_channels) { 539 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL; 540 if (buf[7]) 541 chset->channels[p].drum_channel = 1; 542 else 543 chset->channels[p].drum_channel = 0; 544 } 545 546 } else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x21) { 547 /* program */ 548 int p = get_channel(buf[5]); 549 if (p < chset->max_channels && 550 ! chset->channels[p].drum_channel) { 551 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL; 552 chset->channels[p].midi_program = buf[7]; 553 } 554 555 } else if (buf[5] == 0x01 && buf[6] == 0x30) { 556 /* reverb mode */ 557 parsed = SNDRV_MIDI_SYSEX_GS_REVERB_MODE; 558 chset->gs_reverb_mode = buf[7]; 559 560 } else if (buf[5] == 0x01 && buf[6] == 0x38) { 561 /* chorus mode */ 562 parsed = SNDRV_MIDI_SYSEX_GS_CHORUS_MODE; 563 chset->gs_chorus_mode = buf[7]; 564 565 } else if (buf[5] == 0x00 && buf[6] == 0x04) { 566 /* master volume */ 567 parsed = SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME; 568 chset->gs_master_volume = buf[7]; 569 570 } 571 } 572 573 /* XG on */ 574 else if (len >= (int)sizeof(xg_on_macro) && 575 memcmp(buf, xg_on_macro, sizeof(xg_on_macro)) == 0) { 576 int i; 577 chset->midi_mode = SNDRV_MIDI_MODE_XG; 578 parsed = SNDRV_MIDI_SYSEX_XG_ON; 579 /* reset CC#0 for drums */ 580 for (i = 0; i < chset->max_channels; i++) { 581 if (chset->channels[i].drum_channel) 582 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 127; 583 else 584 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 0; 585 } 586 } 587 588 if (ops->sysex) 589 ops->sysex(private, buf - 1, len + 1, parsed, chset); 590 } 591 592 /* 593 * all sound off 594 */ 595 static void 596 all_sounds_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) 597 { 598 int n; 599 600 if (! ops->note_terminate) 601 return; 602 for (n = 0; n < 128; n++) { 603 if (chan->note[n]) { 604 ops->note_terminate(drv, n, chan); 605 chan->note[n] = 0; 606 } 607 } 608 } 609 610 /* 611 * all notes off 612 */ 613 static void 614 all_notes_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) 615 { 616 int n; 617 618 if (! ops->note_off) 619 return; 620 for (n = 0; n < 128; n++) { 621 if (chan->note[n] == SNDRV_MIDI_NOTE_ON) 622 note_off(ops, drv, chan, n, 0); 623 } 624 } 625 626 /* 627 * Initialise a single midi channel control block. 628 */ 629 static void snd_midi_channel_init(struct snd_midi_channel *p, int n) 630 { 631 if (p == NULL) 632 return; 633 634 memset(p, 0, sizeof(struct snd_midi_channel)); 635 p->private = NULL; 636 p->number = n; 637 638 snd_midi_reset_controllers(p); 639 p->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 640 p->gm_rpn_fine_tuning = 0; 641 p->gm_rpn_coarse_tuning = 0; 642 643 if (n == 9) 644 p->drum_channel = 1; /* Default ch 10 as drums */ 645 } 646 647 /* 648 * Allocate and initialise a set of midi channel control blocks. 649 */ 650 static struct snd_midi_channel *snd_midi_channel_init_set(int n) 651 { 652 struct snd_midi_channel *chan; 653 int i; 654 655 chan = kmalloc(n * sizeof(struct snd_midi_channel), GFP_KERNEL); 656 if (chan) { 657 for (i = 0; i < n; i++) 658 snd_midi_channel_init(chan+i, i); 659 } 660 661 return chan; 662 } 663 664 /* 665 * reset all midi channels 666 */ 667 static void 668 reset_all_channels(struct snd_midi_channel_set *chset) 669 { 670 int ch; 671 for (ch = 0; ch < chset->max_channels; ch++) { 672 struct snd_midi_channel *chan = chset->channels + ch; 673 snd_midi_reset_controllers(chan); 674 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 675 chan->gm_rpn_fine_tuning = 0; 676 chan->gm_rpn_coarse_tuning = 0; 677 678 if (ch == 9) 679 chan->drum_channel = 1; 680 else 681 chan->drum_channel = 0; 682 } 683 } 684 685 686 /* 687 * Allocate and initialise a midi channel set. 688 */ 689 struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n) 690 { 691 struct snd_midi_channel_set *chset; 692 693 chset = kmalloc(sizeof(*chset), GFP_KERNEL); 694 if (chset) { 695 chset->channels = snd_midi_channel_init_set(n); 696 chset->private_data = NULL; 697 chset->max_channels = n; 698 } 699 return chset; 700 } 701 702 /* 703 * Reset the midi controllers on a particular channel to default values. 704 */ 705 static void snd_midi_reset_controllers(struct snd_midi_channel *chan) 706 { 707 memset(chan->control, 0, sizeof(chan->control)); 708 chan->gm_volume = 127; 709 chan->gm_expression = 127; 710 chan->gm_pan = 64; 711 } 712 713 714 /* 715 * Free a midi channel set. 716 */ 717 void snd_midi_channel_free_set(struct snd_midi_channel_set *chset) 718 { 719 if (chset == NULL) 720 return; 721 kfree(chset->channels); 722 kfree(chset); 723 } 724 725 static int __init alsa_seq_midi_emul_init(void) 726 { 727 return 0; 728 } 729 730 static void __exit alsa_seq_midi_emul_exit(void) 731 { 732 } 733 734 module_init(alsa_seq_midi_emul_init) 735 module_exit(alsa_seq_midi_emul_exit) 736 737 EXPORT_SYMBOL(snd_midi_process_event); 738 EXPORT_SYMBOL(snd_midi_channel_set_clear); 739 EXPORT_SYMBOL(snd_midi_channel_alloc_set); 740 EXPORT_SYMBOL(snd_midi_channel_free_set); 741