ss_song.c

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2005 Angel Ortega <angel@triptico.com>
   5
   6     ss_song.c - Software synth song event stream management
   7
   8     This program is free software; you can redistribute it and/or
   9     modify it under the terms of the GNU General Public License
  10     as published by the Free Software Foundation; either version 2
  11     of the License, or (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     http://www.triptico.com
  23
  24 */
  25
  26 #include "config.h"
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <math.h>
  32
  33 #include "annhell.h"
  34
  35 /*******************
  36         Data
  37 ********************/
  38
  39 struct ss_ev_generic
  40 {
  41         song_ev_type type;      /* event type */
  42         int frame;              /* frame number (time) */
  43         int trk_id;             /* track id */
  44 };
  45
  46 struct ss_ev_note_off
  47 {
  48         song_ev_type type;      /* SONG_EV_NOTE_OFF */
  49         int frame;
  50         int trk_id;
  51         int note_id;            /* note id */
  52 };
  53
  54 struct ss_ev_note_on
  55 {
  56         song_ev_type type;      /* SONG_EV_NOTE_ON */
  57         int frame;
  58         int trk_id;
  59         int note_id;            /* note id */
  60         int note;               /* MIDI-like note */
  61         float vol;              /* volume */
  62 };
  63
  64 struct ss_ev_ss_sustain
  65 {
  66         song_ev_type type;      /* SONG_EV_SS_SUSTAIN */
  67         int frame;
  68         int trk_id;
  69         double sustain;         /* sustain time (in frames) */
  70 };
  71
  72 struct ss_ev_ss_vibrato
  73 {
  74         song_ev_type type;      /* SONG_EV_SS_VIBRATO */
  75         int frame;
  76         int trk_id;
  77         double vib_depth;       /* vibrato depth (in msecs) */
  78         double vib_freq;        /* vibrato frequency (in Hzs) */
  79 };
  80
  81 struct ss_ev_ss_channel
  82 {
  83         song_ev_type type;      /* SONG_EV_SS_CHANNEL */
  84         int frame;
  85         int trk_id;
  86         int channel;            /* channel */
  87         float vol;              /* volume */
  88 };
  89
  90 struct ss_ev_ss_wav
  91 {
  92         song_ev_type type;      /* SONG_EV_SS_WAV */
  93         int frame;
  94         int trk_id;
  95         char * file;            /* path to .wav file */
  96         int base;               /* MIDI-like base note */
  97         int min;                /* MIDI-like minimum note */
  98         int max;                /* MIDI-like maximum note */
  99         double loop_start;      /* loop start */
 100         double loop_end;        /* loop end */
 101 };
 102
 103 struct ss_ev_ss_pat
 104 {
 105         song_ev_type type;      /* SONG_EV_SS_PAT */
 106         int frame;
 107         int trk_id;
 108         char * file;            /* path to .pat file */
 109 };
 110
 111 struct ss_ev_tempo
 112 {
 113         song_ev_type type;      /* SONG_EV_TEMPO */
 114         int frame;
 115         int trk_id;
 116         double tempo;           /* tempo in bmp */
 117 };
 118
 119 struct ss_ev_pitch_stretch
 120 {
 121         song_ev_type type;      /* SONG_EV_SS_PITCH_STRETCH */
 122         int frame;
 123         int trk_id;
 124         int note_id;            /* note id */
 125         int note;               /* MIDI-like note (to find the wave) */
 126         double len;             /* note length (1: whole note) */
 127         float vol;              /* note volume (1: full volume) */
 128 };
 129
 130 struct ss_ev_ss_eff
 131 {
 132         song_ev_type type;      /* effect type */
 133         int frame;
 134         int trk_id;
 135         int channel;            /* channel */
 136         double size;            /* size of effect */
 137         float gain;             /* gain */
 138         double depth;           /* depth */
 139         double freq;            /* freq */
 140         double phase;           /* phase */
 141         float initial;          /* initial vol */
 142         float final;            /* final vol */
 143 };
 144
 145 union ss_ev
 146 {
 147         struct ss_ev_generic generic;
 148         struct ss_ev_note_on note_on;
 149         struct ss_ev_note_off note_off;
 150         struct ss_ev_ss_sustain ss_sustain;
 151         struct ss_ev_ss_vibrato ss_vibrato;
 152         struct ss_ev_ss_channel ss_channel;
 153         struct ss_ev_ss_wav ss_wav;
 154         struct ss_ev_ss_pat ss_pat;
 155         struct ss_ev_ss_eff ss_eff;
 156         struct ss_ev_tempo tempo;
 157         struct ss_ev_pitch_stretch ss_pitch_stretch;
 158 };
 159
 160 /* the softsynth song stream */
 161
 162 static union ss_ev * ss_song=NULL;
 163 static int n_ss_ev=0;
 164
 165
 166 /* the instruments */
 167
 168 #define SONG_INS_NUM 256
 169 struct ss_ins song_ins[SONG_INS_NUM];
 170
 171
 172 /*******************
 173         Code
 174 ********************/
 175
 176 static void add_ss_ev(union ss_ev * e)
 177 /* adds a softsynth song event */
 178 {
 179         /* reallocs */
 180         ss_song=(union ss_ev *)realloc(ss_song,
 181                 (n_ss_ev + 1) * sizeof(union ss_ev));
 182
 183         /* store */
 184         memcpy(&ss_song[n_ss_ev], e, sizeof(union ss_ev));
 185
 186         n_ss_ev++;
 187 }
 188
 189
 190 static int ss_ev_cmp(const void * v1, const void * v2)
 191 /* softsynth song event compare function for qsort() */
 192 {
 193         struct ss_ev_generic * e1;
 194         struct ss_ev_generic * e2;
 195
 196         e1=(struct ss_ev_generic *)v1; e2=(struct ss_ev_generic *)v2;
 197
 198         if(e1->frame == e2->frame)
 199                 return(e1->type - e2->type);
 200
 201         return(e1->frame - e2->frame);
 202 }
 203
 204
 205 static int ss_song_convert_events(void)
 206 /* converts generic song_ev events to softsynth events */
 207 {
 208         int note_id=1;
 209         union song_ev * e;
 210         union ss_ev sse;
 211         int frame, frame_ac, f_frame;
 212         double fpw, time_ac, time_ac_m;
 213         int num, den;
 214         int n;
 215         int b_track=-1;
 216
 217         /* resets the ss stream */
 218         if(ss_song != NULL)
 219         {
 220                 free(ss_song);
 221                 ss_song=NULL;
 222         }
 223
 224         n_ss_ev=0;
 225
 226         /* sorts the song */
 227         song_sort();
 228
 229         fpw=0;
 230         frame=frame_ac=f_frame=0;
 231         time_ac=time_ac_m=0;
 232         num=den=4;
 233
 234         /* travels the song events generating softsynth song events */
 235         for(n=0;n < n_song_ev;n++)
 236         {
 237                 /* gets the song event */
 238                 e=&song[n];
 239
 240                 /* calculates the frame */
 241                 frame=((e->generic.time - time_ac) * fpw) + frame_ac;
 242
 243                 /* generic event data */
 244                 sse.generic.type=e->generic.type;
 245                 sse.generic.frame=frame;
 246                 sse.generic.trk_id=e->generic.trk_id;
 247
 248                 /* account the biggest track seen */
 249                 if(b_track < e->generic.trk_id) b_track=e->generic.trk_id;
 250
 251                 switch(e->generic.type)
 252                 {
 253                 case SONG_EV_TEMPO:
 254
 255                         /* updates accumulations */
 256                         frame_ac += frame;
 257                         time_ac += e->generic.time;
 258
 259                         /* calculates frames-per-whole based on new tempo */
 260                         fpw=(double) ss_frequency * 60.0;
 261                         fpw /= e->tempo.tempo / 4.0;
 262
 263                         /* adds an event */
 264                         sse.tempo.tempo=e->tempo.tempo;
 265                         add_ss_ev(&sse);
 266
 267                         break;
 268
 269                 case SONG_EV_METER:
 270
 271                         /* just store the values */
 272                         num=e->meter.num;
 273                         den=e->meter.den;
 274                         time_ac_m=e->meter.time;
 275
 276                         break;
 277
 278                 case SONG_EV_MEASURE:
 279
 280                         song_test_measure_boundary(e->measure.time - time_ac_m,
 281                                 num, den, e->measure.line);
 282                         break;
 283
 284                 case SONG_EV_NOTE:
 285
 286                         /* convert to note on / off pairs */
 287
 288                         sse.note_on.type=SONG_EV_NOTE_ON;
 289                         sse.note_on.note_id=note_id++;
 290                         sse.note_on.note=e->note.note;
 291                         sse.note_on.vol=e->note.vol;
 292
 293                         add_ss_ev(&sse);
 294
 295                         frame += (int)(e->note.len * fpw);
 296
 297                         sse.note_off.type=SONG_EV_NOTE_OFF;
 298                         sse.note_off.frame=frame;
 299
 300                         add_ss_ev(&sse);
 301                         break;
 302
 303                 case SONG_EV_SS_PITCH_STRETCH:
 304
 305                         sse.ss_pitch_stretch.note_id=note_id++;
 306                         sse.ss_pitch_stretch.note=e->ss_pitch_stretch.note;
 307                         sse.ss_pitch_stretch.len=e->ss_pitch_stretch.len;
 308                         sse.ss_pitch_stretch.vol=e->ss_pitch_stretch.vol;
 309
 310                         add_ss_ev(&sse);
 311
 312                         frame += (int)(e->ss_pitch_stretch.len * fpw);
 313
 314                         sse.note_off.type=SONG_EV_NOTE_OFF;
 315                         sse.note_off.frame=frame;
 316
 317                         add_ss_ev(&sse);
 318                         break;
 319
 320                 case SONG_EV_SS_WAV:
 321
 322                         sse.ss_wav.file=e->ss_wav.file;
 323                         sse.ss_wav.base=e->ss_wav.base;
 324                         sse.ss_wav.min=e->ss_wav.min;
 325                         sse.ss_wav.max=e->ss_wav.max;
 326                         sse.ss_wav.loop_start=e->ss_wav.loop_start;
 327                         sse.ss_wav.loop_end=e->ss_wav.loop_end;
 328
 329                         add_ss_ev(&sse);
 330                         break;
 331
 332                 case SONG_EV_SS_PAT:
 333
 334                         sse.ss_pat.file=e->ss_pat.file;
 335
 336                         add_ss_ev(&sse);
 337                         break;
 338
 339                 case SONG_EV_SS_SUSTAIN:
 340
 341                         sse.ss_sustain.sustain=e->ss_sustain.sustain;
 342
 343                         add_ss_ev(&sse);
 344                         break;
 345
 346                 case SONG_EV_SS_VIBRATO:
 347
 348                         sse.ss_vibrato.vib_depth=e->ss_vibrato.vib_depth;
 349                         sse.ss_vibrato.vib_freq=e->ss_vibrato.vib_freq;
 350
 351                         add_ss_ev(&sse);
 352                         break;
 353
 354                 case SONG_EV_SS_CHANNEL:
 355
 356                         sse.ss_channel.channel=e->ss_channel.channel;
 357                         sse.ss_channel.vol=e->ss_channel.vol;
 358
 359                         add_ss_ev(&sse);
 360                         break;
 361
 362                 case SONG_EV_SS_EFF_DELAY:
 363                 case SONG_EV_SS_EFF_ECHO:
 364                 case SONG_EV_SS_EFF_COMB:
 365                 case SONG_EV_SS_EFF_ALLPASS:
 366                 case SONG_EV_SS_EFF_FLANGER:
 367                 case SONG_EV_SS_EFF_WOBBLE:
 368                 case SONG_EV_SS_EFF_SQWOBBLE:
 369                 case SONG_EV_SS_EFF_FADER:
 370                 case SONG_EV_SS_EFF_REVERB:
 371                 case SONG_EV_SS_EFF_OFF:
 372
 373                         sse.ss_eff.channel=e->ss_eff.channel;
 374                         sse.ss_eff.size=e->ss_eff.size;
 375                         sse.ss_eff.gain=e->ss_eff.gain;
 376                         sse.ss_eff.depth=e->ss_eff.depth;
 377                         sse.ss_eff.freq=e->ss_eff.freq;
 378                         sse.ss_eff.phase=e->ss_eff.phase;
 379                         sse.ss_eff.initial=e->ss_eff.initial;
 380                         sse.ss_eff.final=e->ss_eff.final;
 381
 382                         add_ss_ev(&sse);
 383                         break;
 384
 385                 case SONG_EV_MIDI_CHANNEL:
 386                 case SONG_EV_MIDI_PROGRAM:
 387
 388                         /* ignored */
 389                         break;
 390
 391                 case SONG_EV_NOTE_ON:
 392                 case SONG_EV_NOTE_OFF:
 393                 case SONG_EV_END:
 394
 395                         /* never found in generic song streams */
 396                         break;
 397                 }
 398
 399                 /* store the further frame seen */
 400                 if(f_frame < frame) f_frame=frame;
 401         }
 402
 403         /* generates an end of event mark, a time after the last one */
 404         sse.generic.type=SONG_EV_END;
 405         sse.generic.frame=f_frame + ss_frequency;
 406         add_ss_ev(&sse);
 407
 408         /* finally sort */
 409         qsort(ss_song, n_ss_ev, sizeof(union ss_ev), ss_ev_cmp);
 410
 411         /* return the number of tracks */
 412         return(b_track + 1);
 413 }
 414
 415
 416 int ss_song_render(void)
 417 {
 418         union ss_ev * e;
 419         int frame;
 420         int go;
 421         int n;
 422         float output[SS_MAX_CHANNELS];
 423         int n_tracks;
 424         struct ss_ins * i;
 425         double tempo=120.0;
 426
 427         /* convert the song to ss events */
 428         n_tracks=ss_song_convert_events();
 429
 430         frame=0;
 431         go=1;
 432         e=ss_song;
 433
 434         /* init the instruments */
 435         for(n=0;n < n_tracks;n++)
 436                 ss_ins_init(&song_ins[n]);
 437
 438         /* loop the events */
 439         while(go)
 440         {
 441                 /* process all events for this exact frame */
 442                 while(e->generic.frame == frame)
 443                 {
 444                         /* take the instrument */
 445                         if(e->generic.trk_id == -1)
 446                                 i=NULL;
 447                         else
 448                                 i=&song_ins[e->generic.trk_id];
 449
 450                         switch(e->generic.type)
 451                         {
 452                         case SONG_EV_NOTE_ON:
 453
 454                                 ss_ins_note_on(i, e->note_on.note,
 455                                         e->note_on.vol, e->note_on.note_id);
 456
 457                                 break;
 458
 459                         case SONG_EV_NOTE_OFF:
 460
 461                                 ss_ins_note_off(i, e->note_off.note_id);
 462
 463                                 break;
 464
 465                         case SONG_EV_SS_SUSTAIN:
 466
 467                                 ss_ins_set_sustain(i, e->ss_sustain.sustain);
 468
 469                                 break;
 470
 471                         case SONG_EV_SS_VIBRATO:
 472
 473                                 ss_ins_set_vibrato(i, e->ss_vibrato.vib_depth,
 474                                         e->ss_vibrato.vib_freq);
 475
 476                                 break;
 477
 478                         case SONG_EV_SS_CHANNEL:
 479
 480                                 ss_ins_set_channel(i, e->ss_channel.channel,
 481                                         e->ss_channel.vol);
 482
 483                                 break;
 484
 485                         case SONG_EV_SS_WAV:
 486
 487                                 {
 488                                         struct ss_wave * w;
 489
 490                                         w=ss_load_wav_file(e->ss_wav.file,
 491                                                 ss_note_frequency(e->ss_wav.base),
 492                                                 ss_note_frequency(e->ss_wav.min),
 493                                                 ss_note_frequency(e->ss_wav.max),
 494                                                 e->ss_wav.loop_start,
 495                                                 e->ss_wav.loop_end);
 496
 497                                         ss_ins_add_layer(i, w);
 498                                 }
 499
 500                                 break;
 501
 502                         case SONG_EV_SS_PAT:
 503
 504                                 ss_load_pat_file(i, e->ss_pat.file);
 505                                 break;
 506
 507                         case SONG_EV_SS_EFF_DELAY:
 508
 509                                 ss_eff_delay(&i->effs[e->ss_eff.channel],
 510                                         e->ss_eff.size);
 511                                 break;
 512
 513                         case SONG_EV_SS_EFF_ECHO:
 514
 515                                 ss_eff_echo(&i->effs[e->ss_eff.channel],
 516                                         e->ss_eff.size, e->ss_eff.gain);
 517                                 break;
 518
 519                         case SONG_EV_SS_EFF_COMB:
 520
 521                                 ss_eff_comb(&i->effs[e->ss_eff.channel],
 522                                         e->ss_eff.size, e->ss_eff.gain);
 523                                 break;
 524
 525                         case SONG_EV_SS_EFF_ALLPASS:
 526
 527                                 ss_eff_allpass(&i->effs[e->ss_eff.channel],
 528                                         e->ss_eff.size, e->ss_eff.gain);
 529                                 break;
 530
 531                         case SONG_EV_SS_EFF_FLANGER:
 532
 533                                 ss_eff_flanger(&i->effs[e->ss_eff.channel],
 534                                         e->ss_eff.size, e->ss_eff.gain,
 535                                         e->ss_eff.depth, e->ss_eff.freq,
 536                                         e->ss_eff.phase);
 537                                 break;
 538
 539                         case SONG_EV_SS_EFF_WOBBLE:
 540
 541                                 ss_eff_wobble(&i->effs[e->ss_eff.channel],
 542                                         e->ss_eff.freq, e->ss_eff.phase);
 543
 544                                 break;
 545
 546                         case SONG_EV_SS_EFF_SQWOBBLE:
 547
 548                                 ss_eff_square_wobble(&i->effs[e->ss_eff.channel],
 549                                         e->ss_eff.freq, e->ss_eff.phase);
 550
 551                                 break;
 552
 553                         case SONG_EV_SS_EFF_FADER:
 554
 555                                 ss_eff_fader(&i->effs[e->ss_eff.channel],
 556                                         e->ss_eff.size, e->ss_eff.initial,
 557                                         e->ss_eff.final);
 558                                 break;
 559
 560                         case SONG_EV_SS_EFF_REVERB:
 561
 562                                 ss_eff_reverb(&i->effs[e->ss_eff.channel]);
 563                                 break;
 564
 565                         case SONG_EV_SS_EFF_OFF:
 566
 567                                 ss_eff_off(&i->effs[e->ss_eff.channel]);
 568                                 break;
 569
 570                         case SONG_EV_TEMPO:
 571
 572                                 /* just store the last tempo */
 573                                 tempo=e->tempo.tempo;
 574                                 break;
 575
 576                         case SONG_EV_SS_PITCH_STRETCH:
 577
 578                                 {
 579                                 int n=0;
 580                                 struct ss_wave * w;
 581                                 double freq;
 582
 583                                 /* find the wave */
 584                                 freq=ss_note_frequency(e->ss_pitch_stretch.note);
 585                                 w=ss_ins_find_layer(i, freq, &n);
 586
 587                                 /* calculate optimal frequency */
 588                                 freq=ss_pitch_from_tempo(w, tempo, e->ss_pitch_stretch.len);
 589
 590                                 /* play the note */
 591                                 ss_ins_play(i, freq, e->ss_pitch_stretch.vol,
 592                                         e->ss_pitch_stretch.note_id, w);
 593                                 }
 594
 595                                 break;
 596
 597                         case SONG_EV_END:
 598
 599                                 go=0;
 600                                 break;
 601
 602                         case SONG_EV_MIDI_CHANNEL:
 603                         case SONG_EV_MIDI_PROGRAM:
 604                         case SONG_EV_NOTE:
 605                         case SONG_EV_METER:
 606                         case SONG_EV_MEASURE:
 607
 608                                 /* never found in ss song streams */
 609                                 break;
 610                         }
 611
 612                         /* next event */
 613                         e++;
 614                 }
 615
 616                 /* reset frame samples */
 617                 ss_output_init_frame(output);
 618
 619                 /* generate output from all instruments */
 620                 for(n=0;n < n_tracks;n++)
 621                         ss_ins_frame(&song_ins[n], output);
 622
 623                 /* dump to sampling driver */
 624                 ss_output_write(output);
 625
 626                 /* next frame */
 627                 frame++;
 628         }
 629
 630         return(0);
 631 }