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 EXPORT_SYMBOL(snd_midi_process_event); 240 241 242 /* 243 * release note 244 */ 245 static void 246 note_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 247 int note, int vel) 248 { 249 if (chan->gm_hold) { 250 /* Hold this note until pedal is turned off */ 251 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED; 252 } else if (chan->note[note] & SNDRV_MIDI_NOTE_SOSTENUTO) { 253 /* Mark this note as release; it will be turned off when sostenuto 254 * is turned off */ 255 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED; 256 } else { 257 chan->note[note] = 0; 258 if (ops->note_off) 259 ops->note_off(drv, note, vel, chan); 260 } 261 } 262 263 /* 264 * Do all driver independent operations for this controller and pass 265 * events that need to take place immediately to the driver. 266 */ 267 static void 268 do_control(struct snd_midi_op *ops, void *drv, struct snd_midi_channel_set *chset, 269 struct snd_midi_channel *chan, int control, int value) 270 { 271 int i; 272 273 if (control >= ARRAY_SIZE(chan->control)) 274 return; 275 276 /* Switches */ 277 if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) { 278 /* These are all switches; either off or on so set to 0 or 127 */ 279 value = (value >= 64)? 127: 0; 280 } 281 chan->control[control] = value; 282 283 switch (control) { 284 case MIDI_CTL_SUSTAIN: 285 if (value == 0) { 286 /* Sustain has been released, turn off held notes */ 287 for (i = 0; i < 128; i++) { 288 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) { 289 chan->note[i] = SNDRV_MIDI_NOTE_OFF; 290 if (ops->note_off) 291 ops->note_off(drv, i, 0, chan); 292 } 293 } 294 } 295 break; 296 case MIDI_CTL_PORTAMENTO: 297 break; 298 case MIDI_CTL_SOSTENUTO: 299 if (value) { 300 /* Mark each note that is currently held down */ 301 for (i = 0; i < 128; i++) { 302 if (chan->note[i] & SNDRV_MIDI_NOTE_ON) 303 chan->note[i] |= SNDRV_MIDI_NOTE_SOSTENUTO; 304 } 305 } else { 306 /* release all notes that were held */ 307 for (i = 0; i < 128; i++) { 308 if (chan->note[i] & SNDRV_MIDI_NOTE_SOSTENUTO) { 309 chan->note[i] &= ~SNDRV_MIDI_NOTE_SOSTENUTO; 310 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) { 311 chan->note[i] = SNDRV_MIDI_NOTE_OFF; 312 if (ops->note_off) 313 ops->note_off(drv, i, 0, chan); 314 } 315 } 316 } 317 } 318 break; 319 case MIDI_CTL_MSB_DATA_ENTRY: 320 chan->control[MIDI_CTL_LSB_DATA_ENTRY] = 0; 321 /* fall through */ 322 case MIDI_CTL_LSB_DATA_ENTRY: 323 if (chan->param_type == SNDRV_MIDI_PARAM_TYPE_REGISTERED) 324 rpn(ops, drv, chan, chset); 325 else 326 nrpn(ops, drv, chan, chset); 327 break; 328 case MIDI_CTL_REGIST_PARM_NUM_LSB: 329 case MIDI_CTL_REGIST_PARM_NUM_MSB: 330 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED; 331 break; 332 case MIDI_CTL_NONREG_PARM_NUM_LSB: 333 case MIDI_CTL_NONREG_PARM_NUM_MSB: 334 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED; 335 break; 336 337 case MIDI_CTL_ALL_SOUNDS_OFF: 338 all_sounds_off(ops, drv, chan); 339 break; 340 341 case MIDI_CTL_ALL_NOTES_OFF: 342 all_notes_off(ops, drv, chan); 343 break; 344 345 case MIDI_CTL_MSB_BANK: 346 if (chset->midi_mode == SNDRV_MIDI_MODE_XG) { 347 if (value == 127) 348 chan->drum_channel = 1; 349 else 350 chan->drum_channel = 0; 351 } 352 break; 353 case MIDI_CTL_LSB_BANK: 354 break; 355 356 case MIDI_CTL_RESET_CONTROLLERS: 357 snd_midi_reset_controllers(chan); 358 break; 359 360 case MIDI_CTL_SOFT_PEDAL: 361 case MIDI_CTL_LEGATO_FOOTSWITCH: 362 case MIDI_CTL_HOLD2: 363 case MIDI_CTL_SC1_SOUND_VARIATION: 364 case MIDI_CTL_SC2_TIMBRE: 365 case MIDI_CTL_SC3_RELEASE_TIME: 366 case MIDI_CTL_SC4_ATTACK_TIME: 367 case MIDI_CTL_SC5_BRIGHTNESS: 368 case MIDI_CTL_E1_REVERB_DEPTH: 369 case MIDI_CTL_E2_TREMOLO_DEPTH: 370 case MIDI_CTL_E3_CHORUS_DEPTH: 371 case MIDI_CTL_E4_DETUNE_DEPTH: 372 case MIDI_CTL_E5_PHASER_DEPTH: 373 goto notyet; 374 notyet: 375 default: 376 if (ops->control) 377 ops->control(drv, control, chan); 378 break; 379 } 380 } 381 382 383 /* 384 * initialize the MIDI status 385 */ 386 void 387 snd_midi_channel_set_clear(struct snd_midi_channel_set *chset) 388 { 389 int i; 390 391 chset->midi_mode = SNDRV_MIDI_MODE_GM; 392 chset->gs_master_volume = 127; 393 394 for (i = 0; i < chset->max_channels; i++) { 395 struct snd_midi_channel *chan = chset->channels + i; 396 memset(chan->note, 0, sizeof(chan->note)); 397 398 chan->midi_aftertouch = 0; 399 chan->midi_pressure = 0; 400 chan->midi_program = 0; 401 chan->midi_pitchbend = 0; 402 snd_midi_reset_controllers(chan); 403 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 404 chan->gm_rpn_fine_tuning = 0; 405 chan->gm_rpn_coarse_tuning = 0; 406 407 if (i == 9) 408 chan->drum_channel = 1; 409 else 410 chan->drum_channel = 0; 411 } 412 } 413 EXPORT_SYMBOL(snd_midi_channel_set_clear); 414 415 /* 416 * Process a rpn message. 417 */ 418 static void 419 rpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 420 struct snd_midi_channel_set *chset) 421 { 422 int type; 423 int val; 424 425 if (chset->midi_mode != SNDRV_MIDI_MODE_NONE) { 426 type = (chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] << 8) | 427 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB]; 428 val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) | 429 chan->control[MIDI_CTL_LSB_DATA_ENTRY]; 430 431 switch (type) { 432 case 0x0000: /* Pitch bend sensitivity */ 433 /* MSB only / 1 semitone per 128 */ 434 chan->gm_rpn_pitch_bend_range = val; 435 break; 436 437 case 0x0001: /* fine tuning: */ 438 /* MSB/LSB, 8192=center, 100/8192 cent step */ 439 chan->gm_rpn_fine_tuning = val - 8192; 440 break; 441 442 case 0x0002: /* coarse tuning */ 443 /* MSB only / 8192=center, 1 semitone per 128 */ 444 chan->gm_rpn_coarse_tuning = val - 8192; 445 break; 446 447 case 0x7F7F: /* "lock-in" RPN */ 448 /* ignored */ 449 break; 450 } 451 } 452 /* should call nrpn or rpn callback here.. */ 453 } 454 455 /* 456 * Process an nrpn message. 457 */ 458 static void 459 nrpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, 460 struct snd_midi_channel_set *chset) 461 { 462 /* parse XG NRPNs here if possible */ 463 if (ops->nrpn) 464 ops->nrpn(drv, chan, chset); 465 } 466 467 468 /* 469 * convert channel parameter in GS sysex 470 */ 471 static int 472 get_channel(unsigned char cmd) 473 { 474 int p = cmd & 0x0f; 475 if (p == 0) 476 p = 9; 477 else if (p < 10) 478 p--; 479 return p; 480 } 481 482 483 /* 484 * Process a sysex message. 485 */ 486 static void 487 sysex(struct snd_midi_op *ops, void *private, unsigned char *buf, int len, 488 struct snd_midi_channel_set *chset) 489 { 490 /* GM on */ 491 static unsigned char gm_on_macro[] = { 492 0x7e,0x7f,0x09,0x01, 493 }; 494 /* XG on */ 495 static unsigned char xg_on_macro[] = { 496 0x43,0x10,0x4c,0x00,0x00,0x7e,0x00, 497 }; 498 /* GS prefix 499 * drum channel: XX=0x1?(channel), YY=0x15, ZZ=on/off 500 * reverb mode: XX=0x01, YY=0x30, ZZ=0-7 501 * chorus mode: XX=0x01, YY=0x38, ZZ=0-7 502 * master vol: XX=0x00, YY=0x04, ZZ=0-127 503 */ 504 static unsigned char gs_pfx_macro[] = { 505 0x41,0x10,0x42,0x12,0x40,/*XX,YY,ZZ*/ 506 }; 507 508 int parsed = SNDRV_MIDI_SYSEX_NOT_PARSED; 509 510 if (len <= 0 || buf[0] != 0xf0) 511 return; 512 /* skip first byte */ 513 buf++; 514 len--; 515 516 /* GM on */ 517 if (len >= (int)sizeof(gm_on_macro) && 518 memcmp(buf, gm_on_macro, sizeof(gm_on_macro)) == 0) { 519 if (chset->midi_mode != SNDRV_MIDI_MODE_GS && 520 chset->midi_mode != SNDRV_MIDI_MODE_XG) { 521 chset->midi_mode = SNDRV_MIDI_MODE_GM; 522 reset_all_channels(chset); 523 parsed = SNDRV_MIDI_SYSEX_GM_ON; 524 } 525 } 526 527 /* GS macros */ 528 else if (len >= 8 && 529 memcmp(buf, gs_pfx_macro, sizeof(gs_pfx_macro)) == 0) { 530 if (chset->midi_mode != SNDRV_MIDI_MODE_GS && 531 chset->midi_mode != SNDRV_MIDI_MODE_XG) 532 chset->midi_mode = SNDRV_MIDI_MODE_GS; 533 534 if (buf[5] == 0x00 && buf[6] == 0x7f && buf[7] == 0x00) { 535 /* GS reset */ 536 parsed = SNDRV_MIDI_SYSEX_GS_RESET; 537 reset_all_channels(chset); 538 } 539 540 else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x15) { 541 /* drum pattern */ 542 int p = get_channel(buf[5]); 543 if (p < chset->max_channels) { 544 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL; 545 if (buf[7]) 546 chset->channels[p].drum_channel = 1; 547 else 548 chset->channels[p].drum_channel = 0; 549 } 550 551 } else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x21) { 552 /* program */ 553 int p = get_channel(buf[5]); 554 if (p < chset->max_channels && 555 ! chset->channels[p].drum_channel) { 556 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL; 557 chset->channels[p].midi_program = buf[7]; 558 } 559 560 } else if (buf[5] == 0x01 && buf[6] == 0x30) { 561 /* reverb mode */ 562 parsed = SNDRV_MIDI_SYSEX_GS_REVERB_MODE; 563 chset->gs_reverb_mode = buf[7]; 564 565 } else if (buf[5] == 0x01 && buf[6] == 0x38) { 566 /* chorus mode */ 567 parsed = SNDRV_MIDI_SYSEX_GS_CHORUS_MODE; 568 chset->gs_chorus_mode = buf[7]; 569 570 } else if (buf[5] == 0x00 && buf[6] == 0x04) { 571 /* master volume */ 572 parsed = SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME; 573 chset->gs_master_volume = buf[7]; 574 575 } 576 } 577 578 /* XG on */ 579 else if (len >= (int)sizeof(xg_on_macro) && 580 memcmp(buf, xg_on_macro, sizeof(xg_on_macro)) == 0) { 581 int i; 582 chset->midi_mode = SNDRV_MIDI_MODE_XG; 583 parsed = SNDRV_MIDI_SYSEX_XG_ON; 584 /* reset CC#0 for drums */ 585 for (i = 0; i < chset->max_channels; i++) { 586 if (chset->channels[i].drum_channel) 587 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 127; 588 else 589 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 0; 590 } 591 } 592 593 if (ops->sysex) 594 ops->sysex(private, buf - 1, len + 1, parsed, chset); 595 } 596 597 /* 598 * all sound off 599 */ 600 static void 601 all_sounds_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) 602 { 603 int n; 604 605 if (! ops->note_terminate) 606 return; 607 for (n = 0; n < 128; n++) { 608 if (chan->note[n]) { 609 ops->note_terminate(drv, n, chan); 610 chan->note[n] = 0; 611 } 612 } 613 } 614 615 /* 616 * all notes off 617 */ 618 static void 619 all_notes_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) 620 { 621 int n; 622 623 if (! ops->note_off) 624 return; 625 for (n = 0; n < 128; n++) { 626 if (chan->note[n] == SNDRV_MIDI_NOTE_ON) 627 note_off(ops, drv, chan, n, 0); 628 } 629 } 630 631 /* 632 * Initialise a single midi channel control block. 633 */ 634 static void snd_midi_channel_init(struct snd_midi_channel *p, int n) 635 { 636 if (p == NULL) 637 return; 638 639 memset(p, 0, sizeof(struct snd_midi_channel)); 640 p->private = NULL; 641 p->number = n; 642 643 snd_midi_reset_controllers(p); 644 p->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 645 p->gm_rpn_fine_tuning = 0; 646 p->gm_rpn_coarse_tuning = 0; 647 648 if (n == 9) 649 p->drum_channel = 1; /* Default ch 10 as drums */ 650 } 651 652 /* 653 * Allocate and initialise a set of midi channel control blocks. 654 */ 655 static struct snd_midi_channel *snd_midi_channel_init_set(int n) 656 { 657 struct snd_midi_channel *chan; 658 int i; 659 660 chan = kmalloc_array(n, sizeof(struct snd_midi_channel), GFP_KERNEL); 661 if (chan) { 662 for (i = 0; i < n; i++) 663 snd_midi_channel_init(chan+i, i); 664 } 665 666 return chan; 667 } 668 669 /* 670 * reset all midi channels 671 */ 672 static void 673 reset_all_channels(struct snd_midi_channel_set *chset) 674 { 675 int ch; 676 for (ch = 0; ch < chset->max_channels; ch++) { 677 struct snd_midi_channel *chan = chset->channels + ch; 678 snd_midi_reset_controllers(chan); 679 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */ 680 chan->gm_rpn_fine_tuning = 0; 681 chan->gm_rpn_coarse_tuning = 0; 682 683 if (ch == 9) 684 chan->drum_channel = 1; 685 else 686 chan->drum_channel = 0; 687 } 688 } 689 690 691 /* 692 * Allocate and initialise a midi channel set. 693 */ 694 struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n) 695 { 696 struct snd_midi_channel_set *chset; 697 698 chset = kmalloc(sizeof(*chset), GFP_KERNEL); 699 if (chset) { 700 chset->channels = snd_midi_channel_init_set(n); 701 chset->private_data = NULL; 702 chset->max_channels = n; 703 } 704 return chset; 705 } 706 EXPORT_SYMBOL(snd_midi_channel_alloc_set); 707 708 /* 709 * Reset the midi controllers on a particular channel to default values. 710 */ 711 static void snd_midi_reset_controllers(struct snd_midi_channel *chan) 712 { 713 memset(chan->control, 0, sizeof(chan->control)); 714 chan->gm_volume = 127; 715 chan->gm_expression = 127; 716 chan->gm_pan = 64; 717 } 718 719 720 /* 721 * Free a midi channel set. 722 */ 723 void snd_midi_channel_free_set(struct snd_midi_channel_set *chset) 724 { 725 if (chset == NULL) 726 return; 727 kfree(chset->channels); 728 kfree(chset); 729 } 730 EXPORT_SYMBOL(snd_midi_channel_free_set); 731