Mercurial > SDL_sound_CoreAudio
annotate decoders/timidity/playmidi.c @ 519:72efeb4643b6 stable-1.0
Fixed uninitialized buffer in mpglib. (Thanks, Phil!).
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 06 Jul 2007 11:29:02 +0000 |
| parents | cbc2a4ffeeec |
| children | c66080364dff |
| rev | line source |
|---|---|
| 199 | 1 /* |
| 2 | |
| 3 TiMidity -- Experimental MIDI to WAVE converter | |
| 4 Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi> | |
| 5 | |
| 6 This program is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 2 of the License, or | |
| 9 (at your option) any later version. | |
| 10 | |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with this program; if not, write to the Free Software | |
| 18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 19 | |
| 20 playmidi.c -- random stuff in need of rearrangement | |
| 21 | |
| 22 */ | |
| 23 | |
| 24 #if HAVE_CONFIG_H | |
| 25 # include <config.h> | |
| 26 #endif | |
| 27 | |
| 28 #include <stdio.h> | |
| 29 #include <stdlib.h> | |
| 30 #include <string.h> | |
| 31 | |
| 32 #include "SDL_sound.h" | |
| 33 | |
| 34 #define __SDL_SOUND_INTERNAL__ | |
| 35 #include "SDL_sound_internal.h" | |
| 36 | |
| 37 #include "timidity.h" | |
| 38 #include "options.h" | |
| 39 #include "instrum.h" | |
| 40 #include "playmidi.h" | |
| 41 #include "output.h" | |
| 42 #include "mix.h" | |
| 43 #include "tables.h" | |
| 44 | |
| 45 static void adjust_amplification(MidiSong *song) | |
| 46 { | |
| 47 song->master_volume = (float)(song->amplification) / (float)100.0; | |
| 48 } | |
| 49 | |
| 50 static void reset_voices(MidiSong *song) | |
| 51 { | |
| 52 int i; | |
| 53 for (i=0; i<MAX_VOICES; i++) | |
| 54 song->voice[i].status=VOICE_FREE; | |
| 55 } | |
| 56 | |
| 57 /* Process the Reset All Controllers event */ | |
| 58 static void reset_controllers(MidiSong *song, int c) | |
| 59 { | |
| 60 song->channel[c].volume=90; /* Some standard says, although the SCC docs say 0. */ | |
| 61 song->channel[c].expression=127; /* SCC-1 does this. */ | |
| 62 song->channel[c].sustain=0; | |
| 63 song->channel[c].pitchbend=0x2000; | |
| 64 song->channel[c].pitchfactor=0; /* to be computed */ | |
| 65 } | |
| 66 | |
| 67 static void reset_midi(MidiSong *song) | |
| 68 { | |
| 69 int i; | |
| 70 for (i=0; i<16; i++) | |
| 71 { | |
| 72 reset_controllers(song, i); | |
| 73 /* The rest of these are unaffected by the Reset All Controllers event */ | |
| 74 song->channel[i].program=song->default_program; | |
| 75 song->channel[i].panning=NO_PANNING; | |
| 76 song->channel[i].pitchsens=2; | |
| 77 song->channel[i].bank=0; /* tone bank or drum set */ | |
| 78 } | |
| 79 reset_voices(song); | |
| 80 } | |
| 81 | |
|
455
cbc2a4ffeeec
* Added support for loading DLS format instruments:
hercules
parents:
312
diff
changeset
|
82 static void select_sample(MidiSong *song, int v, Instrument *ip, int vel) |
| 199 | 83 { |
| 84 Sint32 f, cdiff, diff; | |
| 85 int s,i; | |
| 86 Sample *sp, *closest; | |
| 87 | |
| 88 s=ip->samples; | |
| 89 sp=ip->sample; | |
| 90 | |
| 91 if (s==1) | |
| 92 { | |
| 93 song->voice[v].sample=sp; | |
| 94 return; | |
| 95 } | |
| 96 | |
| 97 f=song->voice[v].orig_frequency; | |
| 98 for (i=0; i<s; i++) | |
| 99 { | |
|
455
cbc2a4ffeeec
* Added support for loading DLS format instruments:
hercules
parents:
312
diff
changeset
|
100 if (sp->low_vel <= vel && sp->high_vel >= vel && |
|
cbc2a4ffeeec
* Added support for loading DLS format instruments:
hercules
parents:
312
diff
changeset
|
101 sp->low_freq <= f && sp->high_freq >= f) |
| 199 | 102 { |
| 103 song->voice[v].sample=sp; | |
| 104 return; | |
| 105 } | |
| 106 sp++; | |
| 107 } | |
| 108 | |
| 109 /* | |
| 110 No suitable sample found! We'll select the sample whose root | |
| 111 frequency is closest to the one we want. (Actually we should | |
| 112 probably convert the low, high, and root frequencies to MIDI note | |
| 113 values and compare those.) */ | |
| 114 | |
| 115 cdiff=0x7FFFFFFF; | |
| 116 closest=sp=ip->sample; | |
| 117 for(i=0; i<s; i++) | |
| 118 { | |
| 119 diff=sp->root_freq - f; | |
| 120 if (diff<0) diff=-diff; | |
| 121 if (diff<cdiff) | |
| 122 { | |
| 123 cdiff=diff; | |
| 124 closest=sp; | |
| 125 } | |
| 126 sp++; | |
| 127 } | |
| 128 song->voice[v].sample=closest; | |
| 129 return; | |
| 130 } | |
| 131 | |
| 132 static void recompute_freq(MidiSong *song, int v) | |
| 133 { | |
| 134 int | |
| 135 sign=(song->voice[v].sample_increment < 0), /* for bidirectional loops */ | |
| 136 pb=song->channel[song->voice[v].channel].pitchbend; | |
| 137 double a; | |
| 138 | |
| 139 if (!song->voice[v].sample->sample_rate) | |
| 140 return; | |
| 141 | |
| 142 if (song->voice[v].vibrato_control_ratio) | |
| 143 { | |
| 144 /* This instrument has vibrato. Invalidate any precomputed | |
| 145 sample_increments. */ | |
| 146 | |
| 147 int i=VIBRATO_SAMPLE_INCREMENTS; | |
| 148 while (i--) | |
| 149 song->voice[v].vibrato_sample_increment[i]=0; | |
| 150 } | |
| 151 | |
| 152 if (pb==0x2000 || pb<0 || pb>0x3FFF) | |
| 153 song->voice[v].frequency = song->voice[v].orig_frequency; | |
| 154 else | |
| 155 { | |
| 156 pb-=0x2000; | |
| 157 if (!(song->channel[song->voice[v].channel].pitchfactor)) | |
| 158 { | |
| 159 /* Damn. Somebody bent the pitch. */ | |
| 160 Sint32 i=pb*song->channel[song->voice[v].channel].pitchsens; | |
| 161 if (pb<0) | |
| 162 i=-i; | |
| 163 song->channel[song->voice[v].channel].pitchfactor= | |
| 164 (float)(bend_fine[(i>>5) & 0xFF] * bend_coarse[i>>13]); | |
| 165 } | |
| 166 if (pb>0) | |
| 167 song->voice[v].frequency= | |
| 168 (Sint32)(song->channel[song->voice[v].channel].pitchfactor * | |
| 169 (double)(song->voice[v].orig_frequency)); | |
| 170 else | |
| 171 song->voice[v].frequency= | |
| 172 (Sint32)((double)(song->voice[v].orig_frequency) / | |
| 173 song->channel[song->voice[v].channel].pitchfactor); | |
| 174 } | |
| 175 | |
| 176 a = FSCALE(((double)(song->voice[v].sample->sample_rate) * | |
| 177 (double)(song->voice[v].frequency)) / | |
| 178 ((double)(song->voice[v].sample->root_freq) * | |
| 179 (double)(song->rate)), | |
| 180 FRACTION_BITS); | |
| 181 | |
| 182 if (sign) | |
| 183 a = -a; /* need to preserve the loop direction */ | |
| 184 | |
| 185 song->voice[v].sample_increment = (Sint32)(a); | |
| 186 } | |
| 187 | |
| 188 static void recompute_amp(MidiSong *song, int v) | |
| 189 { | |
| 190 Sint32 tempamp; | |
| 191 | |
| 192 /* TODO: use fscale */ | |
| 193 | |
| 194 tempamp= (song->voice[v].velocity * | |
| 195 song->channel[song->voice[v].channel].volume * | |
| 196 song->channel[song->voice[v].channel].expression); /* 21 bits */ | |
| 197 | |
| 198 if (!(song->encoding & PE_MONO)) | |
| 199 { | |
| 200 if (song->voice[v].panning > 60 && song->voice[v].panning < 68) | |
| 201 { | |
| 202 song->voice[v].panned=PANNED_CENTER; | |
| 203 | |
| 204 song->voice[v].left_amp= | |
| 205 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume, | |
| 206 21); | |
| 207 } | |
| 208 else if (song->voice[v].panning<5) | |
| 209 { | |
| 210 song->voice[v].panned = PANNED_LEFT; | |
| 211 | |
| 212 song->voice[v].left_amp= | |
| 213 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume, | |
| 214 20); | |
| 215 } | |
| 216 else if (song->voice[v].panning>123) | |
| 217 { | |
| 218 song->voice[v].panned = PANNED_RIGHT; | |
| 219 | |
| 220 song->voice[v].left_amp= /* left_amp will be used */ | |
| 221 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume, | |
| 222 20); | |
| 223 } | |
| 224 else | |
| 225 { | |
| 226 song->voice[v].panned = PANNED_MYSTERY; | |
| 227 | |
| 228 song->voice[v].left_amp= | |
| 229 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume, | |
| 230 27); | |
| 231 song->voice[v].right_amp = song->voice[v].left_amp * (song->voice[v].panning); | |
| 232 song->voice[v].left_amp *= (float)(127 - song->voice[v].panning); | |
| 233 } | |
| 234 } | |
| 235 else | |
| 236 { | |
| 237 song->voice[v].panned = PANNED_CENTER; | |
| 238 | |
| 239 song->voice[v].left_amp= | |
| 240 FSCALENEG((double)(tempamp) * song->voice[v].sample->volume * song->master_volume, | |
| 241 21); | |
| 242 } | |
| 243 } | |
| 244 | |
| 245 static void start_note(MidiSong *song, MidiEvent *e, int i) | |
| 246 { | |
| 247 Instrument *ip; | |
| 248 int j; | |
| 249 | |
| 250 if (ISDRUMCHANNEL(song, e->channel)) | |
| 251 { | |
| 252 if (!(ip=song->drumset[song->channel[e->channel].bank]->instrument[e->a])) | |
| 253 { | |
| 254 if (!(ip=song->drumset[0]->instrument[e->a])) | |
| 255 return; /* No instrument? Then we can't play. */ | |
| 256 } | |
| 257 if (ip->samples != 1) | |
| 258 { | |
| 259 SNDDBG(("Strange: percussion instrument with %d samples!", | |
| 260 ip->samples)); | |
| 261 } | |
| 262 | |
| 263 if (ip->sample->note_to_use) /* Do we have a fixed pitch? */ | |
| 264 song->voice[i].orig_frequency = freq_table[(int)(ip->sample->note_to_use)]; | |
| 265 else | |
| 266 song->voice[i].orig_frequency = freq_table[e->a & 0x7F]; | |
| 267 | |
| 268 /* drums are supposed to have only one sample */ | |
| 269 song->voice[i].sample = ip->sample; | |
| 270 } | |
| 271 else | |
| 272 { | |
| 273 if (song->channel[e->channel].program == SPECIAL_PROGRAM) | |
| 274 ip=song->default_instrument; | |
| 275 else if (!(ip=song->tonebank[song->channel[e->channel].bank]-> | |
| 276 instrument[song->channel[e->channel].program])) | |
| 277 { | |
| 278 if (!(ip=song->tonebank[0]->instrument[song->channel[e->channel].program])) | |
| 279 return; /* No instrument? Then we can't play. */ | |
| 280 } | |
| 281 | |
| 282 if (ip->sample->note_to_use) /* Fixed-pitch instrument? */ | |
| 283 song->voice[i].orig_frequency = freq_table[(int)(ip->sample->note_to_use)]; | |
| 284 else | |
| 285 song->voice[i].orig_frequency = freq_table[e->a & 0x7F]; | |
|
455
cbc2a4ffeeec
* Added support for loading DLS format instruments:
hercules
parents:
312
diff
changeset
|
286 select_sample(song, i, ip, e->b); |
| 199 | 287 } |
| 288 | |
| 289 song->voice[i].status = VOICE_ON; | |
| 290 song->voice[i].channel = e->channel; | |
| 291 song->voice[i].note = e->a; | |
| 292 song->voice[i].velocity = e->b; | |
| 293 song->voice[i].sample_offset = 0; | |
| 294 song->voice[i].sample_increment = 0; /* make sure it isn't negative */ | |
| 295 | |
| 296 song->voice[i].tremolo_phase = 0; | |
| 297 song->voice[i].tremolo_phase_increment = song->voice[i].sample->tremolo_phase_increment; | |
| 298 song->voice[i].tremolo_sweep = song->voice[i].sample->tremolo_sweep_increment; | |
| 299 song->voice[i].tremolo_sweep_position = 0; | |
| 300 | |
| 301 song->voice[i].vibrato_sweep = song->voice[i].sample->vibrato_sweep_increment; | |
| 302 song->voice[i].vibrato_sweep_position = 0; | |
| 303 song->voice[i].vibrato_control_ratio = song->voice[i].sample->vibrato_control_ratio; | |
| 304 song->voice[i].vibrato_control_counter = song->voice[i].vibrato_phase = 0; | |
| 305 for (j=0; j<VIBRATO_SAMPLE_INCREMENTS; j++) | |
| 306 song->voice[i].vibrato_sample_increment[j] = 0; | |
| 307 | |
| 308 if (song->channel[e->channel].panning != NO_PANNING) | |
| 309 song->voice[i].panning = song->channel[e->channel].panning; | |
| 310 else | |
| 311 song->voice[i].panning = song->voice[i].sample->panning; | |
| 312 | |
| 313 recompute_freq(song, i); | |
| 314 recompute_amp(song, i); | |
| 315 if (song->voice[i].sample->modes & MODES_ENVELOPE) | |
| 316 { | |
| 317 /* Ramp up from 0 */ | |
| 318 song->voice[i].envelope_stage = 0; | |
| 319 song->voice[i].envelope_volume = 0; | |
| 320 song->voice[i].control_counter = 0; | |
| 321 recompute_envelope(song, i); | |
| 322 apply_envelope_to_amp(song, i); | |
| 323 } | |
| 324 else | |
| 325 { | |
| 326 song->voice[i].envelope_increment = 0; | |
| 327 apply_envelope_to_amp(song, i); | |
| 328 } | |
| 329 } | |
| 330 | |
| 331 static void kill_note(MidiSong *song, int i) | |
| 332 { | |
| 333 song->voice[i].status = VOICE_DIE; | |
| 334 } | |
| 335 | |
| 336 /* Only one instance of a note can be playing on a single channel. */ | |
| 337 static void note_on(MidiSong *song) | |
| 338 { | |
| 339 int i = song->voices, lowest=-1; | |
| 340 Sint32 lv=0x7FFFFFFF, v; | |
| 341 MidiEvent *e = song->current_event; | |
| 342 | |
| 343 while (i--) | |
| 344 { | |
| 345 if (song->voice[i].status == VOICE_FREE) | |
| 346 lowest=i; /* Can't get a lower volume than silence */ | |
| 347 else if (song->voice[i].channel==e->channel && | |
| 348 (song->voice[i].note==e->a || song->channel[song->voice[i].channel].mono)) | |
| 349 kill_note(song, i); | |
| 350 } | |
| 351 | |
| 352 if (lowest != -1) | |
| 353 { | |
| 354 /* Found a free voice. */ | |
| 355 start_note(song,e,lowest); | |
| 356 return; | |
| 357 } | |
| 358 | |
| 359 /* Look for the decaying note with the lowest volume */ | |
| 360 i = song->voices; | |
| 361 while (i--) | |
| 362 { | |
| 363 if ((song->voice[i].status != VOICE_ON) && | |
| 364 (song->voice[i].status != VOICE_DIE)) | |
| 365 { | |
| 366 v = song->voice[i].left_mix; | |
| 367 if ((song->voice[i].panned == PANNED_MYSTERY) | |
| 368 && (song->voice[i].right_mix > v)) | |
| 369 v = song->voice[i].right_mix; | |
| 370 if (v<lv) | |
| 371 { | |
| 372 lv=v; | |
| 373 lowest=i; | |
| 374 } | |
| 375 } | |
| 376 } | |
| 377 | |
| 378 if (lowest != -1) | |
| 379 { | |
| 380 /* This can still cause a click, but if we had a free voice to | |
| 381 spare for ramping down this note, we wouldn't need to kill it | |
| 382 in the first place... Still, this needs to be fixed. Perhaps | |
| 383 we could use a reserve of voices to play dying notes only. */ | |
| 384 | |
| 385 song->cut_notes++; | |
| 386 song->voice[lowest].status=VOICE_FREE; | |
| 387 start_note(song,e,lowest); | |
| 388 } | |
| 389 else | |
| 390 song->lost_notes++; | |
| 391 } | |
| 392 | |
| 393 static void finish_note(MidiSong *song, int i) | |
| 394 { | |
| 395 if (song->voice[i].sample->modes & MODES_ENVELOPE) | |
| 396 { | |
| 397 /* We need to get the envelope out of Sustain stage */ | |
| 398 song->voice[i].envelope_stage = 3; | |
| 399 song->voice[i].status = VOICE_OFF; | |
| 400 recompute_envelope(song, i); | |
| 401 apply_envelope_to_amp(song, i); | |
| 402 } | |
| 403 else | |
| 404 { | |
| 405 /* Set status to OFF so resample_voice() will let this voice out | |
| 406 of its loop, if any. In any case, this voice dies when it | |
| 407 hits the end of its data (ofs>=data_length). */ | |
| 408 song->voice[i].status = VOICE_OFF; | |
| 409 } | |
| 410 } | |
| 411 | |
| 412 static void note_off(MidiSong *song) | |
| 413 { | |
| 414 int i = song->voices; | |
| 415 MidiEvent *e = song->current_event; | |
| 416 | |
| 417 while (i--) | |
| 418 if (song->voice[i].status == VOICE_ON && | |
| 419 song->voice[i].channel == e->channel && | |
| 420 song->voice[i].note == e->a) | |
| 421 { | |
| 422 if (song->channel[e->channel].sustain) | |
| 423 { | |
| 424 song->voice[i].status = VOICE_SUSTAINED; | |
| 425 } | |
| 426 else | |
| 427 finish_note(song, i); | |
| 428 return; | |
| 429 } | |
| 430 } | |
| 431 | |
| 432 /* Process the All Notes Off event */ | |
| 433 static void all_notes_off(MidiSong *song) | |
| 434 { | |
| 435 int i = song->voices; | |
| 436 int c = song->current_event->channel; | |
| 437 | |
| 438 SNDDBG(("All notes off on channel %d", c)); | |
| 439 while (i--) | |
| 440 if (song->voice[i].status == VOICE_ON && | |
| 441 song->voice[i].channel == c) | |
| 442 { | |
| 443 if (song->channel[c].sustain) | |
| 444 song->voice[i].status = VOICE_SUSTAINED; | |
| 445 else | |
| 446 finish_note(song, i); | |
| 447 } | |
| 448 } | |
| 449 | |
| 450 /* Process the All Sounds Off event */ | |
| 451 static void all_sounds_off(MidiSong *song) | |
| 452 { | |
| 453 int i = song->voices; | |
| 454 int c = song->current_event->channel; | |
| 455 | |
| 456 while (i--) | |
| 457 if (song->voice[i].channel == c && | |
| 458 song->voice[i].status != VOICE_FREE && | |
| 459 song->voice[i].status != VOICE_DIE) | |
| 460 { | |
| 461 kill_note(song, i); | |
| 462 } | |
| 463 } | |
| 464 | |
| 465 static void adjust_pressure(MidiSong *song) | |
| 466 { | |
| 467 MidiEvent *e = song->current_event; | |
| 468 int i = song->voices; | |
| 469 | |
| 470 while (i--) | |
| 471 if (song->voice[i].status == VOICE_ON && | |
| 472 song->voice[i].channel == e->channel && | |
| 473 song->voice[i].note == e->a) | |
| 474 { | |
| 475 song->voice[i].velocity = e->b; | |
| 476 recompute_amp(song, i); | |
| 477 apply_envelope_to_amp(song, i); | |
| 478 return; | |
| 479 } | |
| 480 } | |
| 481 | |
| 482 static void drop_sustain(MidiSong *song) | |
| 483 { | |
| 484 int i = song->voices; | |
| 485 int c = song->current_event->channel; | |
| 486 | |
| 487 while (i--) | |
| 488 if (song->voice[i].status == VOICE_SUSTAINED && song->voice[i].channel == c) | |
| 489 finish_note(song, i); | |
| 490 } | |
| 491 | |
| 492 static void adjust_pitchbend(MidiSong *song) | |
| 493 { | |
| 494 int c = song->current_event->channel; | |
| 495 int i = song->voices; | |
| 496 | |
| 497 while (i--) | |
| 498 if (song->voice[i].status != VOICE_FREE && song->voice[i].channel == c) | |
| 499 { | |
| 500 recompute_freq(song, i); | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 static void adjust_volume(MidiSong *song) | |
| 505 { | |
| 506 int c = song->current_event->channel; | |
| 507 int i = song->voices; | |
| 508 | |
| 509 while (i--) | |
| 510 if (song->voice[i].channel == c && | |
| 511 (song->voice[i].status==VOICE_ON || song->voice[i].status==VOICE_SUSTAINED)) | |
| 512 { | |
| 513 recompute_amp(song, i); | |
| 514 apply_envelope_to_amp(song, i); | |
| 515 } | |
| 516 } | |
| 517 | |
| 518 static void seek_forward(MidiSong *song, Sint32 until_time) | |
| 519 { | |
| 520 reset_voices(song); | |
| 521 while (song->current_event->time < until_time) | |
| 522 { | |
| 523 switch(song->current_event->type) | |
| 524 { | |
| 525 /* All notes stay off. Just handle the parameter changes. */ | |
| 526 | |
| 527 case ME_PITCH_SENS: | |
| 528 song->channel[song->current_event->channel].pitchsens = | |
| 529 song->current_event->a; | |
| 530 song->channel[song->current_event->channel].pitchfactor = 0; | |
| 531 break; | |
| 532 | |
| 533 case ME_PITCHWHEEL: | |
| 534 song->channel[song->current_event->channel].pitchbend = | |
| 535 song->current_event->a + song->current_event->b * 128; | |
| 536 song->channel[song->current_event->channel].pitchfactor = 0; | |
| 537 break; | |
| 538 | |
| 539 case ME_MAINVOLUME: | |
| 540 song->channel[song->current_event->channel].volume = | |
| 541 song->current_event->a; | |
| 542 break; | |
| 543 | |
| 544 case ME_PAN: | |
| 545 song->channel[song->current_event->channel].panning = | |
| 546 song->current_event->a; | |
| 547 break; | |
| 548 | |
| 549 case ME_EXPRESSION: | |
| 550 song->channel[song->current_event->channel].expression = | |
| 551 song->current_event->a; | |
| 552 break; | |
| 553 | |
| 554 case ME_PROGRAM: | |
| 555 if (ISDRUMCHANNEL(song, song->current_event->channel)) | |
| 556 /* Change drum set */ | |
| 557 song->channel[song->current_event->channel].bank = | |
| 558 song->current_event->a; | |
| 559 else | |
| 560 song->channel[song->current_event->channel].program = | |
| 561 song->current_event->a; | |
| 562 break; | |
| 563 | |
| 564 case ME_SUSTAIN: | |
| 565 song->channel[song->current_event->channel].sustain = | |
| 566 song->current_event->a; | |
| 567 break; | |
| 568 | |
| 569 case ME_RESET_CONTROLLERS: | |
| 570 reset_controllers(song, song->current_event->channel); | |
| 571 break; | |
| 572 | |
| 573 case ME_TONE_BANK: | |
| 574 song->channel[song->current_event->channel].bank = | |
| 575 song->current_event->a; | |
| 576 break; | |
| 577 | |
| 578 case ME_EOT: | |
| 579 song->current_sample = song->current_event->time; | |
| 580 return; | |
| 581 } | |
| 582 song->current_event++; | |
| 583 } | |
| 584 /*song->current_sample=song->current_event->time;*/ | |
| 585 if (song->current_event != song->events) | |
| 586 song->current_event--; | |
| 587 song->current_sample=until_time; | |
| 588 } | |
| 589 | |
| 590 static void skip_to(MidiSong *song, Sint32 until_time) | |
| 591 { | |
| 592 if (song->current_sample > until_time) | |
| 593 song->current_sample = 0; | |
| 594 | |
| 595 reset_midi(song); | |
| 596 song->buffered_count = 0; | |
| 597 song->buffer_pointer = song->common_buffer; | |
| 598 song->current_event = song->events; | |
| 599 | |
| 600 if (until_time) | |
| 601 seek_forward(song, until_time); | |
| 602 } | |
| 603 | |
| 604 static void do_compute_data(MidiSong *song, Sint32 count) | |
| 605 { | |
| 606 int i; | |
| 607 memset(song->buffer_pointer, 0, | |
| 608 (song->encoding & PE_MONO) ? (count * 4) : (count * 8)); | |
| 609 for (i = 0; i < song->voices; i++) | |
| 610 { | |
| 611 if(song->voice[i].status != VOICE_FREE) | |
| 612 mix_voice(song, song->buffer_pointer, i, count); | |
| 613 } | |
| 614 song->current_sample += count; | |
| 615 } | |
| 616 | |
| 617 /* count=0 means flush remaining buffered data to output device, then | |
| 618 flush the device itself */ | |
| 619 static void compute_data(MidiSong *song, void *stream, Sint32 count) | |
| 620 { | |
| 621 int channels; | |
| 622 | |
| 623 if ( song->encoding & PE_MONO ) | |
| 624 channels = 1; | |
| 625 else | |
| 626 channels = 2; | |
| 627 | |
| 628 if (!count) | |
| 629 { | |
| 630 if (song->buffered_count) | |
| 631 song->write(stream, song->common_buffer, channels * song->buffered_count); | |
| 632 song->buffer_pointer = song->common_buffer; | |
| 633 song->buffered_count = 0; | |
| 634 return; | |
| 635 } | |
| 636 | |
| 637 while ((count + song->buffered_count) >= song->buffer_size) | |
| 638 { | |
| 639 do_compute_data(song, song->buffer_size - song->buffered_count); | |
| 640 count -= song->buffer_size - song->buffered_count; | |
| 641 song->write(stream, song->common_buffer, channels * song->buffer_size); | |
| 642 song->buffer_pointer = song->common_buffer; | |
| 643 song->buffered_count = 0; | |
| 644 } | |
| 645 if (count>0) | |
| 646 { | |
| 647 do_compute_data(song, count); | |
| 648 song->buffered_count += count; | |
| 649 song->buffer_pointer += (song->encoding & PE_MONO) ? count : count*2; | |
| 650 } | |
| 651 } | |
| 652 | |
| 653 void Timidity_Start(MidiSong *song) | |
| 654 { | |
| 655 song->playing = 1; | |
| 656 adjust_amplification(song); | |
| 657 skip_to(song, 0); | |
| 658 } | |
| 659 | |
| 312 | 660 void Timidity_Seek(MidiSong *song, Uint32 ms) |
| 661 { | |
| 662 skip_to(song, (ms * song->rate) / 1000); | |
| 663 } | |
| 664 | |
| 199 | 665 int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len) |
| 666 { | |
| 667 Sint32 start_sample, end_sample, samples; | |
| 668 int bytes_per_sample; | |
| 669 | |
| 670 if (!song->playing) | |
| 671 return 0; | |
| 672 | |
| 673 bytes_per_sample = | |
| 674 ((song->encoding & PE_MONO) ? 1 : 2) | |
| 675 * ((song->encoding & PE_16BIT) ? 2 : 1); | |
| 676 samples = len / bytes_per_sample; | |
| 677 | |
| 678 start_sample = song->current_sample; | |
| 679 end_sample = song->current_sample+samples; | |
| 680 while ( song->current_sample < end_sample ) { | |
| 681 /* Handle all events that should happen at this time */ | |
| 682 while (song->current_event->time <= song->current_sample) { | |
| 683 switch(song->current_event->type) { | |
| 684 | |
| 685 /* Effects affecting a single note */ | |
| 686 | |
| 687 case ME_NOTEON: | |
| 688 if (!(song->current_event->b)) /* Velocity 0? */ | |
| 689 note_off(song); | |
| 690 else | |
| 691 note_on(song); | |
| 692 break; | |
| 693 | |
| 694 case ME_NOTEOFF: | |
| 695 note_off(song); | |
| 696 break; | |
| 697 | |
| 698 case ME_KEYPRESSURE: | |
| 699 adjust_pressure(song); | |
| 700 break; | |
| 701 | |
| 702 /* Effects affecting a single channel */ | |
| 703 | |
| 704 case ME_PITCH_SENS: | |
| 705 song->channel[song->current_event->channel].pitchsens = | |
| 706 song->current_event->a; | |
| 707 song->channel[song->current_event->channel].pitchfactor = 0; | |
| 708 break; | |
| 709 | |
| 710 case ME_PITCHWHEEL: | |
| 711 song->channel[song->current_event->channel].pitchbend = | |
| 712 song->current_event->a + song->current_event->b * 128; | |
| 713 song->channel[song->current_event->channel].pitchfactor = 0; | |
| 714 /* Adjust pitch for notes already playing */ | |
| 715 adjust_pitchbend(song); | |
| 716 break; | |
| 717 | |
| 718 case ME_MAINVOLUME: | |
| 719 song->channel[song->current_event->channel].volume = | |
| 720 song->current_event->a; | |
| 721 adjust_volume(song); | |
| 722 break; | |
| 723 | |
| 724 case ME_PAN: | |
| 725 song->channel[song->current_event->channel].panning = | |
| 726 song->current_event->a; | |
| 727 break; | |
| 728 | |
| 729 case ME_EXPRESSION: | |
| 730 song->channel[song->current_event->channel].expression = | |
| 731 song->current_event->a; | |
| 732 adjust_volume(song); | |
| 733 break; | |
| 734 | |
| 735 case ME_PROGRAM: | |
| 736 if (ISDRUMCHANNEL(song, song->current_event->channel)) { | |
| 737 /* Change drum set */ | |
| 738 song->channel[song->current_event->channel].bank = | |
| 739 song->current_event->a; | |
| 740 } | |
| 741 else | |
| 742 song->channel[song->current_event->channel].program = | |
| 743 song->current_event->a; | |
| 744 break; | |
| 745 | |
| 746 case ME_SUSTAIN: | |
| 747 song->channel[song->current_event->channel].sustain = | |
| 748 song->current_event->a; | |
| 749 if (!song->current_event->a) | |
| 750 drop_sustain(song); | |
| 751 break; | |
| 752 | |
| 753 case ME_RESET_CONTROLLERS: | |
| 754 reset_controllers(song, song->current_event->channel); | |
| 755 break; | |
| 756 | |
| 757 case ME_ALL_NOTES_OFF: | |
| 758 all_notes_off(song); | |
| 759 break; | |
| 760 | |
| 761 case ME_ALL_SOUNDS_OFF: | |
| 762 all_sounds_off(song); | |
| 763 break; | |
| 764 | |
| 765 case ME_TONE_BANK: | |
| 766 song->channel[song->current_event->channel].bank = | |
| 767 song->current_event->a; | |
| 768 break; | |
| 769 | |
| 770 case ME_EOT: | |
| 771 /* Give the last notes a couple of seconds to decay */ | |
| 772 SNDDBG(("Playing time: ~%d seconds\n", | |
| 773 song->current_sample/song->rate+2)); | |
| 774 SNDDBG(("Notes cut: %d\n", song->cut_notes)); | |
| 775 SNDDBG(("Notes lost totally: %d\n", song->lost_notes)); | |
| 776 song->playing = 0; | |
| 777 return (song->current_sample - start_sample) * bytes_per_sample; | |
| 778 } | |
| 779 song->current_event++; | |
| 780 } | |
| 781 if (song->current_event->time > end_sample) | |
| 782 compute_data(song, stream, end_sample-song->current_sample); | |
| 783 else | |
| 784 compute_data(song, stream, song->current_event->time-song->current_sample); | |
| 785 } | |
| 786 return samples * bytes_per_sample; | |
| 787 } | |
| 788 | |
| 789 void Timidity_SetVolume(MidiSong *song, int volume) | |
| 790 { | |
| 791 int i; | |
| 792 if (volume > MAX_AMPLIFICATION) | |
| 793 song->amplification = MAX_AMPLIFICATION; | |
| 794 else | |
| 795 if (volume < 0) | |
| 796 song->amplification = 0; | |
| 797 else | |
| 798 song->amplification = volume; | |
| 799 adjust_amplification(song); | |
| 800 for (i = 0; i < song->voices; i++) | |
| 801 if (song->voice[i].status != VOICE_FREE) | |
| 802 { | |
| 803 recompute_amp(song, i); | |
| 804 apply_envelope_to_amp(song, i); | |
| 805 } | |
| 806 } |