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