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 if (control >= ARRAY_SIZE(chan->control)) 273 return; 274 275 /* Switches */ 276 if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) { 277 /* These are all switches; either off or on so set to 0 or 127 */ 278 value = (value >= 64)? 127: 0; 279 } 280 chan->control[control] = value; 281 282 switch (control) { 283 case MIDI_CTL_SUSTAIN: 284 if (value == 0) { 285 /* Sustain has been released, turn off held notes */ 286 for (i = 0; i < 128; i++) { 287 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) { 288 chan->note[i] = SNDRV_MIDI_NOTE_OFF; 289 if (ops->note_off) 290 ops->note_off(drv, i, 0, chan); 291 } 292 } 293 } 294 break; 295 case MIDI_CTL_PORTAMENTO: 296 break; 297 case MIDI_CTL_SOSTENUTO: 298 if (value) { 299 /* Mark each note that is currently held down */ 300 for (i = 0; i < 128; i++) { 301 if (chan->note[i] & SNDRV_MIDI_NOTE_ON) 302 chan->note[i] |= SNDRV_MIDI_NOTE_SOSTENUTO; 303 } 304 } else { 305 /* release all notes that were held */ 306 for (i = 0; i < 128; i++) { 307 if (chan->note[i] & SNDRV_MIDI_NOTE_SOSTENUTO) { 308 chan->note[i] &= ~SNDRV_MIDI_NOTE_SOSTENUTO; 309 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) { 310 chan->note[i] = SNDRV_MIDI_NOTE_OFF; 311 if (ops->note_off) 312 ops->note_off(drv, i, 0, chan); 313 } 314 } 315 } 316 } 317 break; 318 case MIDI_CTL_MSB_DATA_ENTRY: 319 chan->control[MIDI_CTL_LSB_DATA_ENTRY] = 0; 320 /* go through here */ 321 case MIDI_CTL_LSB_DATA_ENTRY: 322 if (chan->param_type == SNDRV_MIDI_PARAM_TYPE_REGISTERED) 323 rpn(ops, drv, chan, chset); 324 else 325 nrpn(ops, drv, chan, chset); 326 break; 327 case MIDI_CTL_REGIST_PARM_NUM_LSB: 328 case MIDI_CTL_REGIST_PARM_NUM_MSB: 329 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED; 330 break; 331 case MIDI_CTL_NONREG_PARM_NUM_LSB: 332 case MIDI_CTL_NONREG_PARM_NUM_MSB: 333 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED; 334 break; 335 336 case MIDI_CTL_ALL_SOUNDS_OFF: 337 all_sounds_off(ops, drv, chan); 338 break; 339 340 case MIDI_CTL_ALL_NOTES_OFF: 341 all_notes_off(ops, drv, chan); 342 break; 343 344 case MIDI_CTL_MSB_BANK: 345 if (chset->midi_mode == SNDRV_MIDI_MODE_XG) { 346 if (value == 127) 347 chan->drum_channel = 1; 348 else 349 chan->drum_channel = 0; 350 } 351 break; 352 case MIDI_CTL_LSB_BANK: 353 break; 354 355 case MIDI_CTL_RESET_CONTROLLERS: 356 snd_midi_reset_controllers(chan); 357 break; 358 359 case MIDI_CTL_SOFT_PEDAL: 360 case MIDI_CTL_LEGATO_FOOTSWITCH: 361 case MIDI_CTL_HOLD2: 362 case MIDI_CTL_SC1_SOUND_VARIATION: 363 case MIDI_CTL_SC2_TIMBRE: 364 case MIDI_CTL_SC3_RELEASE_TIME: 365 case MIDI_CTL_SC4_ATTACK_TIME: 366 case MIDI_CTL_SC5_BRIGHTNESS: 367 case MIDI_CTL_E1_REVERB_DEPTH: 368 case MIDI_CTL_E2_TREMOLO_DEPTH: 369 case MIDI_CTL_E3_CHORUS_DEPTH: 370 case MIDI_CTL_E4_DETUNE_DEPTH: 371 case MIDI_CTL_E5_PHASER_DEPTH: 372 goto notyet; 373 notyet: 374 default: 375 if (ops->control) 376 ops->control(drv, control, chan); 377 break; 378 } 379 } 380 381 382 /* 383 * initialize the MIDI status 384 */ 385 void 386 snd_midi_channel_set_clear(struct snd_midi_channel_set *chset) 387 { 388 int i; 389 390 chset->midi_mode = SNDRV_MIDI_MODE_GM; 391 chset->gs_master_volume = 127; 392 393 for (i = 0; i < chset->max_channels; i++) { 394 struct snd_midi_channel *chan = chset->channels + i; 395 memset(chan->note, 0, sizeof(chan->note)); 396 397 chan->midi_aftertouch = 0; 398 chan->midi_pressure = 0; 399 chan->midi_program = 0; 400 chan->midi_pitchbend = 0; 401 snd_midi_reset_controllers(chan); 402 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 403 chan->gm_rpn_fine_tuning = 0; 404 chan->gm_rpn_coarse_tuning = 0; 405 406 if (i == 9) 407 chan->drum_channel = 1; 408 else 409 chan->drum_channel = 0; 410 } 411 } 412 413 /* 414 * Process a rpn message. 415 */ 416 static void 417 rpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 418 struct snd_midi_channel_set *chset) 419 { 420 int type; 421 int val; 422 423 if (chset->midi_mode != SNDRV_MIDI_MODE_NONE) { 424 type = (chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] << 8) | 425 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB]; 426 val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) | 427 chan->control[MIDI_CTL_LSB_DATA_ENTRY]; 428 429 switch (type) { 430 case 0x0000: /* Pitch bend sensitivity */ 431 /* MSB only / 1 semitone per 128 */ 432 chan->gm_rpn_pitch_bend_range = val; 433 break; 434 435 case 0x0001: /* fine tuning: */ 436 /* MSB/LSB, 8192=center, 100/8192 cent step */ 437 chan->gm_rpn_fine_tuning = val - 8192; 438 break; 439 440 case 0x0002: /* coarse tuning */ 441 /* MSB only / 8192=center, 1 semitone per 128 */ 442 chan->gm_rpn_coarse_tuning = val - 8192; 443 break; 444 445 case 0x7F7F: /* "lock-in" RPN */ 446 /* ignored */ 447 break; 448 } 449 } 450 /* should call nrpn or rpn callback here.. */ 451 } 452 453 /* 454 * Process an nrpn message. 455 */ 456 static void 457 nrpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 458 struct snd_midi_channel_set *chset) 459 { 460 /* parse XG NRPNs here if possible */ 461 if (ops->nrpn) 462 ops->nrpn(drv, chan, chset); 463 } 464 465 466 /* 467 * convert channel parameter in GS sysex 468 */ 469 static int 470 get_channel(unsigned char cmd) 471 { 472 int p = cmd & 0x0f; 473 if (p == 0) 474 p = 9; 475 else if (p < 10) 476 p--; 477 return p; 478 } 479 480 481 /* 482 * Process a sysex message. 483 */ 484 static void 485 sysex(struct snd_midi_op *ops, void *private, unsigned char *buf, int len, 486 struct snd_midi_channel_set *chset) 487 { 488 /* GM on */ 489 static unsigned char gm_on_macro[] = { 490 0x7e,0x7f,0x09,0x01, 491 }; 492 /* XG on */ 493 static unsigned char xg_on_macro[] = { 494 0x43,0x10,0x4c,0x00,0x00,0x7e,0x00, 495 }; 496 /* GS prefix 497 * drum channel: XX=0x1?(channel), YY=0x15, ZZ=on/off 498 * reverb mode: XX=0x01, YY=0x30, ZZ=0-7 499 * chorus mode: XX=0x01, YY=0x38, ZZ=0-7 500 * master vol: XX=0x00, YY=0x04, ZZ=0-127 501 */ 502 static unsigned char gs_pfx_macro[] = { 503 0x41,0x10,0x42,0x12,0x40,/*XX,YY,ZZ*/ 504 }; 505 506 int parsed = SNDRV_MIDI_SYSEX_NOT_PARSED; 507 508 if (len <= 0 || buf[0] != 0xf0) 509 return; 510 /* skip first byte */ 511 buf++; 512 len--; 513 514 /* GM on */ 515 if (len >= (int)sizeof(gm_on_macro) && 516 memcmp(buf, gm_on_macro, sizeof(gm_on_macro)) == 0) { 517 if (chset->midi_mode != SNDRV_MIDI_MODE_GS && 518 chset->midi_mode != SNDRV_MIDI_MODE_XG) { 519 chset->midi_mode = SNDRV_MIDI_MODE_GM; 520 reset_all_channels(chset); 521 parsed = SNDRV_MIDI_SYSEX_GM_ON; 522 } 523 } 524 525 /* GS macros */ 526 else if (len >= 8 && 527 memcmp(buf, gs_pfx_macro, sizeof(gs_pfx_macro)) == 0) { 528 if (chset->midi_mode != SNDRV_MIDI_MODE_GS && 529 chset->midi_mode != SNDRV_MIDI_MODE_XG) 530 chset->midi_mode = SNDRV_MIDI_MODE_GS; 531 532 if (buf[5] == 0x00 && buf[6] == 0x7f && buf[7] == 0x00) { 533 /* GS reset */ 534 parsed = SNDRV_MIDI_SYSEX_GS_RESET; 535 reset_all_channels(chset); 536 } 537 538 else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x15) { 539 /* drum pattern */ 540 int p = get_channel(buf[5]); 541 if (p < chset->max_channels) { 542 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL; 543 if (buf[7]) 544 chset->channels[p].drum_channel = 1; 545 else 546 chset->channels[p].drum_channel = 0; 547 } 548 549 } else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x21) { 550 /* program */ 551 int p = get_channel(buf[5]); 552 if (p < chset->max_channels && 553 ! chset->channels[p].drum_channel) { 554 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL; 555 chset->channels[p].midi_program = buf[7]; 556 } 557 558 } else if (buf[5] == 0x01 && buf[6] == 0x30) { 559 /* reverb mode */ 560 parsed = SNDRV_MIDI_SYSEX_GS_REVERB_MODE; 561 chset->gs_reverb_mode = buf[7]; 562 563 } else if (buf[5] == 0x01 && buf[6] == 0x38) { 564 /* chorus mode */ 565 parsed = SNDRV_MIDI_SYSEX_GS_CHORUS_MODE; 566 chset->gs_chorus_mode = buf[7]; 567 568 } else if (buf[5] == 0x00 && buf[6] == 0x04) { 569 /* master volume */ 570 parsed = SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME; 571 chset->gs_master_volume = buf[7]; 572 573 } 574 } 575 576 /* XG on */ 577 else if (len >= (int)sizeof(xg_on_macro) && 578 memcmp(buf, xg_on_macro, sizeof(xg_on_macro)) == 0) { 579 int i; 580 chset->midi_mode = SNDRV_MIDI_MODE_XG; 581 parsed = SNDRV_MIDI_SYSEX_XG_ON; 582 /* reset CC#0 for drums */ 583 for (i = 0; i < chset->max_channels; i++) { 584 if (chset->channels[i].drum_channel) 585 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 127; 586 else 587 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 0; 588 } 589 } 590 591 if (ops->sysex) 592 ops->sysex(private, buf - 1, len + 1, parsed, chset); 593 } 594 595 /* 596 * all sound off 597 */ 598 static void 599 all_sounds_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) 600 { 601 int n; 602 603 if (! ops->note_terminate) 604 return; 605 for (n = 0; n < 128; n++) { 606 if (chan->note[n]) { 607 ops->note_terminate(drv, n, chan); 608 chan->note[n] = 0; 609 } 610 } 611 } 612 613 /* 614 * all notes off 615 */ 616 static void 617 all_notes_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) 618 { 619 int n; 620 621 if (! ops->note_off) 622 return; 623 for (n = 0; n < 128; n++) { 624 if (chan->note[n] == SNDRV_MIDI_NOTE_ON) 625 note_off(ops, drv, chan, n, 0); 626 } 627 } 628 629 /* 630 * Initialise a single midi channel control block. 631 */ 632 static void snd_midi_channel_init(struct snd_midi_channel *p, int n) 633 { 634 if (p == NULL) 635 return; 636 637 memset(p, 0, sizeof(struct snd_midi_channel)); 638 p->private = NULL; 639 p->number = n; 640 641 snd_midi_reset_controllers(p); 642 p->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 643 p->gm_rpn_fine_tuning = 0; 644 p->gm_rpn_coarse_tuning = 0; 645 646 if (n == 9) 647 p->drum_channel = 1; /* Default ch 10 as drums */ 648 } 649 650 /* 651 * Allocate and initialise a set of midi channel control blocks. 652 */ 653 static struct snd_midi_channel *snd_midi_channel_init_set(int n) 654 { 655 struct snd_midi_channel *chan; 656 int i; 657 658 chan = kmalloc(n * sizeof(struct snd_midi_channel), GFP_KERNEL); 659 if (chan) { 660 for (i = 0; i < n; i++) 661 snd_midi_channel_init(chan+i, i); 662 } 663 664 return chan; 665 } 666 667 /* 668 * reset all midi channels 669 */ 670 static void 671 reset_all_channels(struct snd_midi_channel_set *chset) 672 { 673 int ch; 674 for (ch = 0; ch < chset->max_channels; ch++) { 675 struct snd_midi_channel *chan = chset->channels + ch; 676 snd_midi_reset_controllers(chan); 677 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 678 chan->gm_rpn_fine_tuning = 0; 679 chan->gm_rpn_coarse_tuning = 0; 680 681 if (ch == 9) 682 chan->drum_channel = 1; 683 else 684 chan->drum_channel = 0; 685 } 686 } 687 688 689 /* 690 * Allocate and initialise a midi channel set. 691 */ 692 struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n) 693 { 694 struct snd_midi_channel_set *chset; 695 696 chset = kmalloc(sizeof(*chset), GFP_KERNEL); 697 if (chset) { 698 chset->channels = snd_midi_channel_init_set(n); 699 chset->private_data = NULL; 700 chset->max_channels = n; 701 } 702 return chset; 703 } 704 705 /* 706 * Reset the midi controllers on a particular channel to default values. 707 */ 708 static void snd_midi_reset_controllers(struct snd_midi_channel *chan) 709 { 710 memset(chan->control, 0, sizeof(chan->control)); 711 chan->gm_volume = 127; 712 chan->gm_expression = 127; 713 chan->gm_pan = 64; 714 } 715 716 717 /* 718 * Free a midi channel set. 719 */ 720 void snd_midi_channel_free_set(struct snd_midi_channel_set *chset) 721 { 722 if (chset == NULL) 723 return; 724 kfree(chset->channels); 725 kfree(chset); 726 } 727 728 static int __init alsa_seq_midi_emul_init(void) 729 { 730 return 0; 731 } 732 733 static void __exit alsa_seq_midi_emul_exit(void) 734 { 735 } 736 737 module_init(alsa_seq_midi_emul_init) 738 module_exit(alsa_seq_midi_emul_exit) 739 740 EXPORT_SYMBOL(snd_midi_process_event); 741 EXPORT_SYMBOL(snd_midi_channel_set_clear); 742 EXPORT_SYMBOL(snd_midi_channel_alloc_set); 743 EXPORT_SYMBOL(snd_midi_channel_free_set); 744