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 "ss_core.h"
  34 #include "song.h"
  35 #include "ss_gen.h"
  36 #include "ss_eff.h"
  37 #include "ss_ins.h"
  38 #include "ss_input.h"
  39 #include "ss_output.h"
  40
  41 /*******************
  42         Data
  43 ********************/
  44
  45 struct ss_ev_generic
  46 {
  47         song_ev_type type;      /* event type */
  48         int frame;              /* frame number (time) */
  49         int trk_id;             /* track id */
  50 };
  51
  52 struct ss_ev_note_off
  53 {
  54         song_ev_type type;      /* SONG_EV_NOTE_OFF */
  55         int frame;
  56         int trk_id;
  57         int note_id;            /* note id */
  58 };
  59
  60 struct ss_ev_note_on
  61 {
  62         song_ev_type type;      /* SONG_EV_NOTE_ON */
  63         int frame;
  64         int trk_id;
  65         int note_id;            /* note id */
  66         int note;               /* MIDI-like note number */
  67         double vol;             /* volume */
  68 };
  69
  70 struct ss_ev_ss_note_on_by_time
  71 {
  72         song_ev_type type;      /* SONG_EV_SS_NOTE_ON_BY_TIME */
  73         int frame;
  74         int trk_id;
  75         int note_id;            /* note id */
  76         int note;               /* MIDI-like note (to find the wave) */
  77         double len;             /* note length (1: whole) */
  78         double vol;             /* volume */
  79 };
  80
  81 struct ss_ev_ss_sustain
  82 {
  83         song_ev_type type;      /* SONG_EV_SS_SUSTAIN */
  84         int frame;
  85         int trk_id;
  86         double sustain;         /* sustain time (in frames) */
  87 };
  88
  89 struct ss_ev_ss_channel_map
  90 {
  91         song_ev_type type;      /* SONG_EV_SS_CHANNEL_MAP */
  92         int frame;
  93         int trk_id;
  94         float vol[CHANNELS];    /* volumes for each channel */
  95 };
  96
  97 struct ss_ev_ss_wav
  98 {
  99         song_ev_type type;      /* SONG_EV_SS_WAV */
 100         int frame;
 101         int trk_id;
 102         char * file;            /* path to .wav file */
 103         int base;               /* MIDI-like base note */
 104         int min;                /* MIDI-like minimum note */
 105         int max;                /* MIDI-like maximum note */
 106         double loop_start;      /* loop start */
 107         double loop_end;        /* loop end */
 108 };
 109
 110 struct ss_ev_ss_pat
 111 {
 112         song_ev_type type;      /* SONG_EV_SS_PAT */
 113         int frame;
 114         int trk_id;
 115         char * file;            /* path to .pat file */
 116 };
 117
 118 struct ss_ev_ss_eff
 119 {
 120         song_ev_type type;      /* effect type */
 121         int frame;
 122         int trk_id;
 123         int channel;            /* channel */
 124         double size;            /* size of effect */
 125         float gain;             /* gain */
 126         double depth;           /* depth */
 127         double freq;            /* freq */
 128         double phase;           /* phase */
 129         float initial;          /* initial vol */
 130         float final;            /* final vol */
 131 };
 132
 133 union ss_ev
 134 {
 135         struct ss_ev_generic generic;
 136         struct ss_ev_note_on note_on;
 137         struct ss_ev_note_off note_off;
 138         struct ss_ev_ss_note_on_by_time ss_note_on_by_time;
 139         struct ss_ev_ss_sustain ss_sustain;
 140         struct ss_ev_ss_channel_map ss_channel_map;
 141         struct ss_ev_ss_wav ss_wav;
 142         struct ss_ev_ss_pat ss_pat;
 143         struct ss_ev_ss_eff ss_eff;
 144 };
 145
 146 /* the softsynth song stream */
 147
 148 static union ss_ev * ss_song=NULL;
 149 static int n_ss_ev=0;
 150
 151
 152 /* the instruments */
 153
 154 #define SONG_INS_NUM 256
 155 struct ss_ins song_ins[SONG_INS_NUM];
 156
 157
 158 /*******************
 159         Code
 160 ********************/
 161
 162 static void add_ss_ev(union ss_ev * e)
 163 /* adds a softsynth song event */
 164 {
 165         n_ss_ev++;
 166
 167         /* reallocs */
 168         ss_song=(union ss_ev *)realloc(ss_song,
 169                 n_ss_ev * sizeof(union ss_ev));
 170
 171         /* store */
 172         memcpy(&ss_song[n_ss_ev - 1], e, sizeof(union ss_ev));
 173 }
 174
 175
 176 static int ss_ev_cmp(const void * v1, const void * v2)
 177 /* softsynth song event compare function for qsort() */
 178 {
 179         struct ss_ev_generic * e1;
 180         struct ss_ev_generic * e2;
 181
 182         e1=(struct ss_ev_generic *)v1; e2=(struct ss_ev_generic *)v2;
 183
 184         if(e1->frame == e2->frame)
 185                 return(e1->type - e2->type);
 186
 187         return(e1->frame - e2->frame);
 188 }
 189
 190
 191 static int ss_song_convert_events(void)
 192 /* converts generic song_ev events to softsynth events */
 193 {
 194         int note_id=1;
 195         union song_ev * e;
 196         union ss_ev sse;
 197         int frame, frame_ac;
 198         double fpw, time_ac;
 199         int num, den;
 200         int n;
 201         int b_track=-1;
 202
 203         /* resets the ss stream */
 204         if(ss_song != NULL)
 205         {
 206                 free(ss_song);
 207                 ss_song=NULL;
 208         }
 209
 210         n_ss_ev=0;
 211
 212         /* sorts the song */
 213         song_sort();
 214
 215         fpw=0;
 216         frame_ac=0;
 217         time_ac=0;
 218         num=den=4;
 219
 220         /* travels the song events generating softsynth song events */
 221         for(n=0;n < _n_song_ev;n++)
 222         {
 223                 /* gets the song event */
 224                 e=&_song[n];
 225
 226                 /* calculates the frame */
 227                 frame=((e->generic.time - time_ac) * fpw) + frame_ac;
 228
 229                 /* generic event data */
 230                 sse.generic.type=e->generic.type;
 231                 sse.generic.frame=frame;
 232                 sse.generic.trk_id=e->generic.trk_id;
 233
 234                 /* account the biggest track seen */
 235                 if(b_track < e->generic.trk_id) b_track=e->generic.trk_id;
 236
 237                 switch(e->generic.type)
 238                 {
 239                 case SONG_EV_TEMPO:
 240
 241                         /* updates accumulations */
 242                         frame_ac += frame;
 243                         time_ac += e->generic.time;
 244
 245                         /* calculates frames-per-whole based on new tempo */
 246                         fpw=(double) ss_frequency * 60.0;
 247                         fpw /= e->tempo.tempo / 4.0;
 248
 249                         break;
 250
 251                 case SONG_EV_METER:
 252
 253                         /* just store the values */
 254                         num=e->meter.num;
 255                         den=e->meter.den;
 256
 257                         break;
 258
 259                 case SONG_EV_MEASURE:
 260
 261                         printf("measure boundary check (must be 0): %d\n",
 262                                 ((int) e->generic.time * num) % den);
 263
 264                         break;
 265
 266                 case SONG_EV_NOTE:
 267
 268                         /* convert to note on / off pairs */
 269
 270                         sse.note_on.type=SONG_EV_NOTE_ON;
 271                         sse.note_on.note_id=note_id++;
 272                         sse.note_on.note=e->note.note;
 273                         sse.note_on.vol=e->note.vol;
 274
 275                         add_ss_ev(&sse);
 276
 277                         frame += (int)(e->note.len * fpw);
 278
 279                         sse.note_off.type=SONG_EV_NOTE_OFF;
 280                         sse.note_off.frame=frame;
 281
 282                         add_ss_ev(&sse);
 283                         break;
 284
 285                 case SONG_EV_SS_NOTE_ON_BY_TIME:
 286
 287                         sse.ss_note_on_by_time.note_id=note_id++;
 288                         sse.ss_note_on_by_time.note=e->ss_note_by_time.note;
 289                         sse.ss_note_on_by_time.len=e->ss_note_by_time.len;
 290                         sse.ss_note_on_by_time.vol=e->ss_note_by_time.vol;
 291
 292                         add_ss_ev(&sse);
 293
 294                         frame += (int)(e->ss_note_by_time.len * fpw);
 295
 296                         sse.note_off.type=SONG_EV_NOTE_OFF;
 297                         sse.note_off.frame=frame;
 298
 299                         add_ss_ev(&sse);
 300                         break;
 301
 302                 case SONG_EV_SS_WAV:
 303
 304                         sse.ss_wav.file=e->ss_wav.file;
 305                         sse.ss_wav.base=e->ss_wav.base;
 306                         sse.ss_wav.min=e->ss_wav.min;
 307                         sse.ss_wav.max=e->ss_wav.max;
 308                         sse.ss_wav.loop_start=e->ss_wav.loop_start;
 309                         sse.ss_wav.loop_end=e->ss_wav.loop_end;
 310
 311                         add_ss_ev(&sse);
 312                         break;
 313
 314                 case SONG_EV_SS_PAT:
 315
 316                         sse.ss_pat.file=e->ss_pat.file;
 317
 318                         add_ss_ev(&sse);
 319                         break;
 320
 321                 case SONG_EV_SS_SUSTAIN:
 322
 323                         sse.ss_sustain.sustain=e->ss_sustain.sustain;
 324
 325                         add_ss_ev(&sse);
 326                         break;
 327
 328                 case SONG_EV_SS_CHANNEL_MAP:
 329
 330                         break;
 331
 332                 case SONG_EV_SS_EFF_DELAY:
 333                 case SONG_EV_SS_EFF_ECHO:
 334                 case SONG_EV_SS_EFF_COMB:
 335                 case SONG_EV_SS_EFF_ALLPASS:
 336                 case SONG_EV_SS_EFF_FLANGER:
 337                 case SONG_EV_SS_EFF_WOBBLE:
 338                 case SONG_EV_SS_EFF_SQWOBBLE:
 339                 case SONG_EV_SS_EFF_FADER:
 340                 case SONG_EV_SS_EFF_REVERB:
 341
 342                         sse.ss_eff.channel=e->ss_eff.channel;
 343                         sse.ss_eff.size=e->ss_eff.size;
 344                         sse.ss_eff.gain=e->ss_eff.gain;
 345                         sse.ss_eff.depth=e->ss_eff.depth;
 346                         sse.ss_eff.freq=e->ss_eff.freq;
 347                         sse.ss_eff.phase=e->ss_eff.phase;
 348                         sse.ss_eff.initial=e->ss_eff.initial;
 349                         sse.ss_eff.final=e->ss_eff.final;
 350
 351                         add_ss_ev(&sse);
 352                         break;
 353
 354                 case SONG_EV_MIDI_CHANNEL:
 355                 case SONG_EV_MIDI_PROGRAM:
 356
 357                         /* ignored */
 358                         break;
 359
 360                 case SONG_EV_NOTE_ON:
 361                 case SONG_EV_NOTE_OFF:
 362                 case SONG_EV_END:
 363
 364                         /* never found in generic song streams */
 365                         break;
 366                 }
 367         }
 368
 369         /* generates an end of event mark, a time after the last one */
 370         sse.generic.type=SONG_EV_END;
 371         sse.generic.frame=frame + ss_frequency;
 372         add_ss_ev(&sse);
 373
 374         /* finally sort */
 375         qsort(ss_song, n_ss_ev, sizeof(union ss_ev), ss_ev_cmp);
 376
 377         /* return the number of tracks */
 378         return(b_track + 1);
 379 }
 380
 381
 382 int ss_song_render(void)
 383 {
 384         union ss_ev * e;
 385         int frame;
 386         int go;
 387         int n;
 388         float output[CHANNELS];
 389         int n_tracks;
 390         struct ss_ins * i;
 391
 392         /* convert the song to ss events */
 393         n_tracks=ss_song_convert_events();
 394
 395         frame=0;
 396         go=1;
 397         e=ss_song;
 398
 399         /* init the instruments */
 400         for(n=0;n < n_tracks;n++)
 401                 ss_ins_init(&song_ins[n], n);
 402
 403         /* loop the events */
 404         while(go)
 405         {
 406                 /* process all events for this exact frame */
 407                 while(e->generic.frame == frame)
 408                 {
 409                         /* take the instrument */
 410                         if(e->generic.trk_id == -1)
 411                                 i=NULL;
 412                         else
 413                                 i=&song_ins[e->generic.trk_id];
 414
 415                         switch(e->generic.type)
 416                         {
 417                         case SONG_EV_NOTE_ON:
 418
 419                                 ss_ins_note_on(i, e->note_on.note,
 420                                         e->note_on.vol, e->note_on.note_id);
 421
 422                                 break;
 423
 424                         case SONG_EV_SS_NOTE_ON_BY_TIME:
 425
 426                                 break;
 427
 428                         case SONG_EV_NOTE_OFF:
 429
 430                                 ss_ins_note_off(i, e->note_off.note_id);
 431
 432                                 break;
 433
 434                         case SONG_EV_SS_SUSTAIN:
 435
 436                                 ss_ins_set_sustain(i, e->ss_sustain.sustain);
 437
 438                                 break;
 439
 440                         case SONG_EV_SS_CHANNEL_MAP:
 441
 442                                 break;
 443
 444                         case SONG_EV_SS_WAV:
 445
 446                                 {
 447                                         struct ss_wave w;
 448
 449                                         ss_load_wav_file(&w, e->ss_wav.file,
 450                                                 ss_note_frequency(e->ss_wav.base),
 451                                                 ss_note_frequency(e->ss_wav.min),
 452                                                 ss_note_frequency(e->ss_wav.max));
 453
 454                                         /* set loop boundaries, if any */
 455                                         if(e->ss_wav.loop_end != 0)
 456                                         {
 457                                                 w.loop_start=e->ss_wav.loop_start;
 458                                                 w.loop_end=e->ss_wav.loop_end;
 459                                         }
 460
 461                                         ss_ins_add_layer(i, &w);
 462                                 }
 463
 464                                 break;
 465
 466                         case SONG_EV_SS_PAT:
 467
 468                                 ss_load_pat_file(i, e->ss_pat.file);
 469                                 break;
 470
 471                         case SONG_EV_SS_EFF_DELAY:
 472
 473                                 ss_eff_delay(&i->effs[e->ss_eff.channel],
 474                                         e->ss_eff.size);
 475                                 break;
 476
 477                         case SONG_EV_SS_EFF_ECHO:
 478
 479                                 ss_eff_echo(&i->effs[e->ss_eff.channel],
 480                                         e->ss_eff.size, e->ss_eff.gain);
 481                                 break;
 482
 483                         case SONG_EV_SS_EFF_COMB:
 484
 485                                 ss_eff_comb(&i->effs[e->ss_eff.channel],
 486                                         e->ss_eff.size, e->ss_eff.gain);
 487                                 break;
 488
 489                         case SONG_EV_SS_EFF_ALLPASS:
 490
 491                                 ss_eff_allpass(&i->effs[e->ss_eff.channel],
 492                                         e->ss_eff.size, e->ss_eff.gain);
 493                                 break;
 494
 495                         case SONG_EV_SS_EFF_FLANGER:
 496
 497                                 ss_eff_flanger(&i->effs[e->ss_eff.channel],
 498                                         e->ss_eff.size, e->ss_eff.gain,
 499                                         e->ss_eff.depth, e->ss_eff.freq,
 500                                         e->ss_eff.phase);
 501                                 break;
 502
 503                         case SONG_EV_SS_EFF_WOBBLE:
 504
 505                                 ss_eff_wobble(&i->effs[e->ss_eff.channel],
 506                                         e->ss_eff.freq, e->ss_eff.phase);
 507
 508                                 break;
 509
 510                         case SONG_EV_SS_EFF_SQWOBBLE:
 511
 512                                 ss_eff_square_wobble(&i->effs[e->ss_eff.channel],
 513                                         e->ss_eff.freq, e->ss_eff.phase);
 514
 515                                 break;
 516
 517                         case SONG_EV_SS_EFF_FADER:
 518
 519                                 ss_eff_fader(&i->effs[e->ss_eff.channel],
 520                                         e->ss_eff.size, e->ss_eff.initial,
 521                                         e->ss_eff.final);
 522                                 break;
 523
 524                         case SONG_EV_SS_EFF_REVERB:
 525
 526                                 ss_eff_reverb(&i->effs[e->ss_eff.channel]);
 527                                 break;
 528
 529                         case SONG_EV_END:
 530
 531                                 go=0;
 532                                 break;
 533
 534                         case SONG_EV_MIDI_CHANNEL:
 535                         case SONG_EV_MIDI_PROGRAM:
 536                         case SONG_EV_NOTE:
 537                         case SONG_EV_TEMPO:
 538                         case SONG_EV_METER:
 539                         case SONG_EV_MEASURE:
 540
 541                                 /* never found in ss song streams */
 542                                 break;
 543                         }
 544
 545                         /* next event */
 546                         e++;
 547                 }
 548
 549                 /* reset frame samples */
 550                 ss_output_init_frame(output);
 551
 552                 /* generate output from all instruments */
 553                 for(n=0;n < n_tracks;n++)
 554                         ss_ins_frame(&song_ins[n], output);
 555
 556                 /* dump to sampling driver */
 557                 ss_output_write(output);
 558
 559                 /* next frame */
 560                 frame++;
 561         }
 562
 563         return(0);
 564 }