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_print_wave_tempo
 131 {
 132         song_ev_type type;      /* SONG_EV_SS_PRINT_WAVE_TEMPO */
 133         int frame;
 134         int trk_id;
 135         int note_id;            /* note id */
 136         int note;               /* MIDI-like note (to find the wave) */
 137         double len;             /* note length (1: whole note) */
 138 };
 139
 140 struct ss_ev_ss_eff
 141 {
 142         song_ev_type type;      /* effect type */
 143         int frame;
 144         int trk_id;
 145         int channel;            /* channel */
 146         double size;            /* size of effect */
 147         float gain;             /* gain */
 148         double depth;           /* depth */
 149         double freq;            /* freq */
 150         double phase;           /* phase */
 151         float initial;          /* initial vol */
 152         float final;            /* final vol */
 153 };
 154
 155 union ss_ev
 156 {
 157         struct ss_ev_generic generic;
 158         struct ss_ev_note_on note_on;
 159         struct ss_ev_note_off note_off;
 160         struct ss_ev_ss_sustain ss_sustain;
 161         struct ss_ev_ss_vibrato ss_vibrato;
 162         struct ss_ev_ss_channel ss_channel;
 163         struct ss_ev_ss_wav ss_wav;
 164         struct ss_ev_ss_pat ss_pat;
 165         struct ss_ev_ss_eff ss_eff;
 166         struct ss_ev_tempo tempo;
 167         struct ss_ev_pitch_stretch ss_pitch_stretch;
 168         struct ss_ev_print_wave_tempo ss_print_wave_tempo;
 169 };
 170
 171 /* the softsynth song stream */
 172
 173 static union ss_ev * ss_song=NULL;
 174 static int n_ss_ev=0;
 175
 176
 177 /* the instruments */
 178
 179 struct ss_ins song_ins[SS_MAX_INSTRUMENTS];
 180
 181
 182 /*******************
 183         Code
 184 ********************/
 185
 186 static void add_ss_ev(union ss_ev * e)
 187 /* adds a softsynth song event */
 188 {
 189         /* reallocs */
 190         ss_song=(union ss_ev *)realloc(ss_song,
 191                 (n_ss_ev + 1) * sizeof(union ss_ev));
 192
 193         /* store */
 194         memcpy(&ss_song[n_ss_ev], e, sizeof(union ss_ev));
 195
 196         n_ss_ev++;
 197 }
 198
 199
 200 static int ss_ev_cmp(const void * v1, const void * v2)
 201 /* softsynth song event compare function for qsort() */
 202 {
 203         struct ss_ev_generic * e1;
 204         struct ss_ev_generic * e2;
 205
 206         e1=(struct ss_ev_generic *)v1; e2=(struct ss_ev_generic *)v2;
 207
 208         if(e1->frame == e2->frame)
 209                 return(e1->type - e2->type);
 210
 211         return(e1->frame - e2->frame);
 212 }
 213
 214
 215 static int ss_song_convert_events(void)
 216 /* converts generic song_ev events to softsynth events */
 217 {
 218         int note_id=1;
 219         union song_ev * e;
 220         union ss_ev sse;
 221         int frame, frame_ac, f_frame;
 222         double fpw, time_ac, time_ac_m;
 223         int num, den;
 224         int n;
 225         int b_track=-1;
 226
 227         /* resets the ss stream */
 228         if(ss_song != NULL)
 229         {
 230                 free(ss_song);
 231                 ss_song=NULL;
 232         }
 233
 234         n_ss_ev=0;
 235
 236         /* sorts the song */
 237         song_sort();
 238
 239         fpw=0;
 240         frame=frame_ac=f_frame=0;
 241         time_ac=time_ac_m=0;
 242         num=den=4;
 243
 244         /* travels the song events generating softsynth song events */
 245         for(n=0;n < n_song_ev;n++)
 246         {
 247                 /* gets the song event */
 248                 e=&song[n];
 249
 250                 /* calculates the frame */
 251                 frame=((e->generic.time - time_ac) * fpw) + frame_ac;
 252
 253                 /* generic event data */
 254                 sse.generic.type=e->generic.type;
 255                 sse.generic.frame=frame;
 256                 sse.generic.trk_id=e->generic.trk_id;
 257
 258                 /* account the biggest track seen */
 259                 if(b_track < e->generic.trk_id) b_track=e->generic.trk_id;
 260
 261                 switch(e->generic.type)
 262                 {
 263                 case SONG_EV_TEMPO:
 264
 265                         /* updates accumulations */
 266                         frame_ac += frame;
 267                         time_ac += e->generic.time;
 268
 269                         /* calculates frames-per-whole based on new tempo */
 270                         fpw=(double) ss_frequency * 60.0;
 271                         fpw /= e->tempo.tempo / 4.0;
 272
 273                         /* adds an event */
 274                         sse.tempo.tempo=e->tempo.tempo;
 275                         add_ss_ev(&sse);
 276
 277                         break;
 278
 279                 case SONG_EV_METER:
 280
 281                         /* just store the values */
 282                         num=e->meter.num;
 283                         den=e->meter.den;
 284                         time_ac_m=e->meter.time;
 285
 286                         break;
 287
 288                 case SONG_EV_MEASURE:
 289
 290                         song_test_measure_boundary(e->measure.time - time_ac_m,
 291                                 num, den, e->measure.line);
 292                         break;
 293
 294                 case SONG_EV_NOTE:
 295
 296                         /* convert to note on / off pairs */
 297
 298                         sse.note_on.type=SONG_EV_NOTE_ON;
 299                         sse.note_on.note_id=note_id++;
 300                         sse.note_on.note=e->note.note;
 301                         sse.note_on.vol=e->note.vol;
 302
 303                         add_ss_ev(&sse);
 304
 305                         frame += (int)(e->note.len * fpw);
 306
 307                         sse.note_off.type=SONG_EV_NOTE_OFF;
 308                         sse.note_off.frame=frame;
 309
 310                         add_ss_ev(&sse);
 311                         break;
 312
 313                 case SONG_EV_SS_PITCH_STRETCH:
 314
 315                         sse.ss_pitch_stretch.note_id=note_id++;
 316                         sse.ss_pitch_stretch.note=e->ss_pitch_stretch.note;
 317                         sse.ss_pitch_stretch.len=e->ss_pitch_stretch.len;
 318                         sse.ss_pitch_stretch.vol=e->ss_pitch_stretch.vol;
 319
 320                         add_ss_ev(&sse);
 321
 322                         frame += (int)(e->ss_pitch_stretch.len * fpw);
 323
 324                         sse.note_off.type=SONG_EV_NOTE_OFF;
 325                         sse.note_off.frame=frame;
 326
 327                         add_ss_ev(&sse);
 328                         break;
 329
 330                 case SONG_EV_SS_PRINT_WAVE_TEMPO:
 331
 332                         sse.ss_print_wave_tempo.note=e->ss_print_wave_tempo.note;
 333                         sse.ss_print_wave_tempo.len=e->ss_print_wave_tempo.len;
 334
 335                         add_ss_ev(&sse);
 336                         break;
 337
 338                 case SONG_EV_SS_WAV:
 339
 340                         sse.ss_wav.file=e->ss_wav.file;
 341                         sse.ss_wav.base=e->ss_wav.base;
 342                         sse.ss_wav.min=e->ss_wav.min;
 343                         sse.ss_wav.max=e->ss_wav.max;
 344                         sse.ss_wav.loop_start=e->ss_wav.loop_start;
 345                         sse.ss_wav.loop_end=e->ss_wav.loop_end;
 346
 347                         add_ss_ev(&sse);
 348                         break;
 349
 350                 case SONG_EV_SS_PAT:
 351
 352                         sse.ss_pat.file=e->ss_pat.file;
 353
 354                         add_ss_ev(&sse);
 355                         break;
 356
 357                 case SONG_EV_SS_SUSTAIN:
 358
 359                         sse.ss_sustain.sustain=e->ss_sustain.sustain;
 360
 361                         add_ss_ev(&sse);
 362                         break;
 363
 364                 case SONG_EV_SS_VIBRATO:
 365
 366                         sse.ss_vibrato.vib_depth=e->ss_vibrato.vib_depth;
 367                         sse.ss_vibrato.vib_freq=e->ss_vibrato.vib_freq;
 368
 369                         add_ss_ev(&sse);
 370                         break;
 371
 372                 case SONG_EV_SS_CHANNEL:
 373
 374                         sse.ss_channel.channel=e->ss_channel.channel;
 375                         sse.ss_channel.vol=e->ss_channel.vol;
 376
 377                         add_ss_ev(&sse);
 378                         break;
 379
 380                 case SONG_EV_SS_EFF_DELAY:
 381                 case SONG_EV_SS_EFF_ECHO:
 382                 case SONG_EV_SS_EFF_COMB:
 383                 case SONG_EV_SS_EFF_ALLPASS:
 384                 case SONG_EV_SS_EFF_FLANGER:
 385                 case SONG_EV_SS_EFF_WOBBLE:
 386                 case SONG_EV_SS_EFF_SQWOBBLE:
 387                 case SONG_EV_SS_EFF_FADER:
 388                 case SONG_EV_SS_EFF_REVERB:
 389                 case SONG_EV_SS_EFF_OFF:
 390
 391                         sse.ss_eff.channel=e->ss_eff.channel;
 392                         sse.ss_eff.size=e->ss_eff.size;
 393                         sse.ss_eff.gain=e->ss_eff.gain;
 394                         sse.ss_eff.depth=e->ss_eff.depth;
 395                         sse.ss_eff.freq=e->ss_eff.freq;
 396                         sse.ss_eff.phase=e->ss_eff.phase;
 397                         sse.ss_eff.initial=e->ss_eff.initial;
 398                         sse.ss_eff.final=e->ss_eff.final;
 399
 400                         add_ss_ev(&sse);
 401                         break;
 402
 403                 case SONG_EV_MIDI_CHANNEL:
 404                 case SONG_EV_MIDI_PROGRAM:
 405
 406                         /* ignored */
 407                         break;
 408
 409                 case SONG_EV_NOTE_ON:
 410                 case SONG_EV_NOTE_OFF:
 411                 case SONG_EV_END:
 412
 413                         /* never found in generic song streams */
 414                         break;
 415                 }
 416
 417                 /* store the further frame seen */
 418                 if(f_frame < frame) f_frame=frame;
 419         }
 420
 421         /* generates an end of event mark, a time after the last one */
 422         sse.generic.type=SONG_EV_END;
 423         sse.generic.frame=f_frame + ss_frequency;
 424         add_ss_ev(&sse);
 425
 426         /* finally sort */
 427         qsort(ss_song, n_ss_ev, sizeof(union ss_ev), ss_ev_cmp);
 428
 429         /* return the number of tracks */
 430         return(b_track + 1);
 431 }
 432
 433
 434 int ss_song_render(int skip_secs)
 435 {
 436         union ss_ev * e;
 437         int frame;
 438         int go;
 439         int n;
 440         float output[SS_MAX_CHANNELS];
 441         int n_tracks;
 442         struct ss_ins * i;
 443         double tempo=120.0;
 444         int skip_frames;
 445
 446         /* convert the song to ss events */
 447         n_tracks=ss_song_convert_events();
 448
 449         frame=0;
 450         go=1;
 451         e=ss_song;
 452
 453         /* init the instruments */
 454         for(n=0;n < n_tracks;n++)
 455                 ss_ins_init(&song_ins[n]);
 456
 457         /* calculate the frame to start playing */
 458         skip_frames=skip_secs * ss_frequency;
 459
 460         /* loop the events */
 461         while(go)
 462         {
 463                 /* process all events for this exact frame */
 464                 while(e->generic.frame == frame)
 465                 {
 466                         /* take the instrument */
 467                         if(e->generic.trk_id == -1)
 468                                 i=NULL;
 469                         else
 470                                 i=&song_ins[e->generic.trk_id];
 471
 472                         switch(e->generic.type)
 473                         {
 474                         case SONG_EV_NOTE_ON:
 475
 476                                 ss_ins_note_on(i, e->note_on.note,
 477                                         e->note_on.vol, e->note_on.note_id);
 478
 479                                 break;
 480
 481                         case SONG_EV_NOTE_OFF:
 482
 483                                 ss_ins_note_off(i, e->note_off.note_id);
 484
 485                                 break;
 486
 487                         case SONG_EV_SS_SUSTAIN:
 488
 489                                 ss_ins_set_sustain(i, e->ss_sustain.sustain);
 490
 491                                 break;
 492
 493                         case SONG_EV_SS_VIBRATO:
 494
 495                                 ss_ins_set_vibrato(i, e->ss_vibrato.vib_depth,
 496                                         e->ss_vibrato.vib_freq);
 497
 498                                 break;
 499
 500                         case SONG_EV_SS_CHANNEL:
 501
 502                                 ss_ins_set_channel(i, e->ss_channel.channel,
 503                                         e->ss_channel.vol);
 504
 505                                 break;
 506
 507                         case SONG_EV_SS_WAV:
 508
 509                                 {
 510                                         struct ss_wave * w;
 511
 512                                         w=ss_load_wav_file(e->ss_wav.file,
 513                                                 ss_note_frequency(e->ss_wav.base),
 514                                                 ss_note_frequency(e->ss_wav.min),
 515                                                 ss_note_frequency(e->ss_wav.max),
 516                                                 e->ss_wav.loop_start,
 517                                                 e->ss_wav.loop_end);
 518
 519                                         ss_ins_add_layer(i, w);
 520                                 }
 521
 522                                 break;
 523
 524                         case SONG_EV_SS_PAT:
 525
 526                                 ss_load_pat_file(i, e->ss_pat.file);
 527                                 break;
 528
 529                         case SONG_EV_SS_EFF_DELAY:
 530
 531                                 ss_eff_delay(&i->effs[e->ss_eff.channel],
 532                                         e->ss_eff.size);
 533                                 break;
 534
 535                         case SONG_EV_SS_EFF_ECHO:
 536
 537                                 ss_eff_echo(&i->effs[e->ss_eff.channel],
 538                                         e->ss_eff.size, e->ss_eff.gain);
 539                                 break;
 540
 541                         case SONG_EV_SS_EFF_COMB:
 542
 543                                 ss_eff_comb(&i->effs[e->ss_eff.channel],
 544                                         e->ss_eff.size, e->ss_eff.gain);
 545                                 break;
 546
 547                         case SONG_EV_SS_EFF_ALLPASS:
 548
 549                                 ss_eff_allpass(&i->effs[e->ss_eff.channel],
 550                                         e->ss_eff.size, e->ss_eff.gain);
 551                                 break;
 552
 553                         case SONG_EV_SS_EFF_FLANGER:
 554
 555                                 ss_eff_flanger(&i->effs[e->ss_eff.channel],
 556                                         e->ss_eff.size, e->ss_eff.gain,
 557                                         e->ss_eff.depth, e->ss_eff.freq,
 558                                         e->ss_eff.phase);
 559                                 break;
 560
 561                         case SONG_EV_SS_EFF_WOBBLE:
 562
 563                                 ss_eff_wobble(&i->effs[e->ss_eff.channel],
 564                                         e->ss_eff.freq, e->ss_eff.phase);
 565
 566                                 break;
 567
 568                         case SONG_EV_SS_EFF_SQWOBBLE:
 569
 570                                 ss_eff_square_wobble(&i->effs[e->ss_eff.channel],
 571                                         e->ss_eff.freq, e->ss_eff.phase);
 572
 573                                 break;
 574
 575                         case SONG_EV_SS_EFF_FADER:
 576
 577                                 ss_eff_fader(&i->effs[e->ss_eff.channel],
 578                                         e->ss_eff.size, e->ss_eff.initial,
 579                                         e->ss_eff.final);
 580                                 break;
 581
 582                         case SONG_EV_SS_EFF_REVERB:
 583
 584                                 ss_eff_reverb(&i->effs[e->ss_eff.channel]);
 585                                 break;
 586
 587                         case SONG_EV_SS_EFF_OFF:
 588
 589                                 ss_eff_off(&i->effs[e->ss_eff.channel]);
 590                                 break;
 591
 592                         case SONG_EV_TEMPO:
 593
 594                                 /* just store the last tempo */
 595                                 tempo=e->tempo.tempo;
 596                                 break;
 597
 598                         case SONG_EV_SS_PITCH_STRETCH:
 599
 600                                 {
 601                                 struct ss_wave * w;
 602                                 double freq;
 603
 604                                 /* find the wave */
 605                                 freq=ss_note_frequency(e->ss_pitch_stretch.note);
 606                                 w=ss_ins_find_layer(i, freq, NULL);
 607
 608                                 /* calculate optimal frequency */
 609                                 freq=ss_pitch_from_tempo(w, tempo,
 610                                         e->ss_pitch_stretch.len);
 611
 612                                 /* play the note */
 613                                 ss_ins_play(i, freq, e->ss_pitch_stretch.vol,
 614                                         e->ss_pitch_stretch.note_id, w);
 615                                 }
 616
 617                                 break;
 618
 619                         case SONG_EV_SS_PRINT_WAVE_TEMPO:
 620
 621                                 {
 622                                 struct ss_wave * w;
 623                                 double freq;
 624
 625                                 /* find the wave */
 626                                 freq=ss_note_frequency(e->ss_print_wave_tempo.note);
 627                                 w=ss_ins_find_layer(i, freq, NULL);
 628
 629                                 /* print the optimal tempo */
 630                                 printf("Optimal tempo: %lf\n",
 631                                         ss_tempo_from_wave(w,
 632                                                 e->ss_print_wave_tempo.note,
 633                                                 e->ss_print_wave_tempo.len));
 634                                 }
 635
 636                                 break;
 637
 638                         case SONG_EV_END:
 639
 640                                 go=0;
 641                                 break;
 642
 643                         case SONG_EV_MIDI_CHANNEL:
 644                         case SONG_EV_MIDI_PROGRAM:
 645                         case SONG_EV_NOTE:
 646                         case SONG_EV_METER:
 647                         case SONG_EV_MEASURE:
 648
 649                                 /* never found in ss song streams */
 650                                 break;
 651                         }
 652
 653                         /* next event */
 654                         e++;
 655                 }
 656
 657                 /* reset frame samples */
 658                 ss_output_init_frame(output);
 659
 660                 /* generate output from all instruments */
 661                 for(n=0;n < n_tracks;n++)
 662                         ss_ins_frame(&song_ins[n], output);
 663
 664                 /* dump to sampling driver */
 665                 if(frame >= skip_frames)
 666                         ss_output_write(output);
 667
 668                 /* next frame */
 669                 frame++;
 670         }
 671
 672         return(0);
 673 }