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 "core.h"
  34 #include "song.h"
  35 #include "ss_gen.h"
  36 #include "ss_eff.h"
  37 #include "ss_ins.h"
  38 #include "input.h"
  39 #include "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         int 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 };
 107
 108 struct ss_ev_ss_pat
 109 {
 110         song_ev_type type;      /* SONG_EV_SS_PAT */
 111         int frame;
 112         int trk_id;
 113         char * file;            /* path to .pat file */
 114 };
 115
 116 struct ss_ev_ss_eff
 117 {
 118         song_ev_type type;      /* effect type */
 119         int frame;
 120         int trk_id;
 121         int channel;            /* channel */
 122         double size;            /* size of effect */
 123         float gain;             /* gain */
 124         double depth;           /* depth */
 125         double freq;            /* freq */
 126         double phase;           /* phase */
 127         float initial;          /* initial vol */
 128         float final;            /* final vol */
 129 };
 130
 131 union ss_ev
 132 {
 133         struct ss_ev_generic generic;
 134         struct ss_ev_note_on note_on;
 135         struct ss_ev_note_off note_off;
 136         struct ss_ev_ss_note_on_by_time ss_note_on_by_time;
 137         struct ss_ev_ss_sustain ss_sustain;
 138         struct ss_ev_ss_channel_map ss_channel_map;
 139         struct ss_ev_ss_wav ss_wav;
 140         struct ss_ev_ss_pat ss_pat;
 141         struct ss_ev_ss_eff ss_eff;
 142 };
 143
 144 /* the softsynth song stream */
 145
 146 static union ss_ev * _ss_song=NULL;
 147 static int _n_ss_ev=0;
 148
 149
 150 /* the instruments */
 151
 152 #define SONG_INS_NUM 256
 153 struct ss_ins song_ins[SONG_INS_NUM];
 154
 155
 156 /*******************
 157         Code
 158 ********************/
 159
 160 static void add_ss_ev(union ss_ev * e)
 161 /* adds a softsynth song event */
 162 {
 163         _n_ss_ev++;
 164
 165         /* reallocs */
 166         _ss_song=(union ss_ev *)realloc(_ss_song,
 167                 _n_ss_ev * sizeof(union ss_ev));
 168
 169         /* store */
 170         memcpy(&_ss_song[_n_ss_ev - 1], e, sizeof(union ss_ev));
 171 }
 172
 173
 174 static int _ss_ev_cmp(const void * v1, const void * v2)
 175 /* softsynth song event compare function for qsort() */
 176 {
 177         struct ss_ev_generic * e1;
 178         struct ss_ev_generic * e2;
 179
 180         e1=(struct ss_ev_generic *)v1; e2=(struct ss_ev_generic *)v2;
 181
 182         if(e1->frame == e2->frame)
 183                 return(e1->type - e2->type);
 184
 185         return(e1->frame - e2->frame);
 186 }
 187
 188
 189 static int _ss_song_convert_events(void)
 190 /* converts generic song_ev events to softsynth events */
 191 {
 192         int note_id=1;
 193         union song_ev * e;
 194         union ss_ev sse;
 195         int frame, frame_ac;
 196         double fpw, time_ac;
 197         int num, den;
 198         int n;
 199         int b_track=-1;
 200
 201         /* resets the ss stream */
 202         if(_ss_song != NULL)
 203         {
 204                 free(_ss_song);
 205                 _ss_song=NULL;
 206         }
 207
 208         _n_ss_ev=0;
 209
 210         /* sorts the song */
 211         song_sort();
 212
 213         fpw=0;
 214         frame_ac=0;
 215         time_ac=0;
 216         num=den=4;
 217
 218         /* travels the song events generating softsynth song events */
 219         for(n=0;n < _n_song_ev;n++)
 220         {
 221                 /* gets the song event */
 222                 e=&_song[n];
 223
 224                 /* calculates the frame */
 225                 frame=((e->generic.time - time_ac) * fpw) + frame_ac;
 226
 227                 /* generic event data */
 228                 sse.generic.type=e->generic.type;
 229                 sse.generic.frame=frame;
 230                 sse.generic.trk_id=e->generic.trk_id;
 231
 232                 /* account the biggest track seen */
 233                 if(b_track < e->generic.trk_id) b_track=e->generic.trk_id;
 234
 235                 switch(e->generic.type)
 236                 {
 237                 case SONG_EV_TEMPO:
 238
 239                         /* updates accumulations */
 240                         frame_ac += frame;
 241                         time_ac += e->generic.time;
 242
 243                         /* calculates frames-per-whole based on new tempo */
 244                         fpw=(double) _frequency * 60.0;
 245                         fpw /= e->tempo.tempo / 4.0;
 246
 247                         break;
 248
 249                 case SONG_EV_METER:
 250
 251                         /* just store the values */
 252                         num=e->meter.num;
 253                         den=e->meter.den;
 254
 255                         break;
 256
 257                 case SONG_EV_MEASURE:
 258
 259                         printf("measure boundary check (must be 0): %d\n",
 260                                 ((int) e->generic.time * num) % den);
 261
 262                         break;
 263
 264                 case SONG_EV_NOTE:
 265
 266                         /* convert to note on / off pairs */
 267
 268                         sse.note_on.type=SONG_EV_NOTE_ON;
 269                         sse.note_on.note_id=note_id++;
 270                         sse.note_on.note=e->note.note;
 271                         sse.note_on.vol=e->note.vol;
 272
 273                         add_ss_ev(&sse);
 274
 275                         frame += (int)(e->note.len * fpw);
 276
 277                         sse.note_off.type=SONG_EV_NOTE_OFF;
 278                         sse.note_off.frame=frame;
 279
 280                         add_ss_ev(&sse);
 281                         break;
 282
 283                 case SONG_EV_SS_NOTE_ON_BY_TIME:
 284
 285                         sse.ss_note_on_by_time.note_id=note_id++;
 286                         sse.ss_note_on_by_time.note=e->ss_note_by_time.note;
 287                         sse.ss_note_on_by_time.len=e->ss_note_by_time.len;
 288                         sse.ss_note_on_by_time.vol=e->ss_note_by_time.vol;
 289
 290                         add_ss_ev(&sse);
 291
 292                         frame += (int)(e->ss_note_by_time.len * fpw);
 293
 294                         sse.note_off.type=SONG_EV_NOTE_OFF;
 295                         sse.note_off.frame=frame;
 296
 297                         add_ss_ev(&sse);
 298                         break;
 299
 300                 case SONG_EV_SS_WAV:
 301
 302                         sse.ss_wav.file=e->ss_wav.file;
 303                         sse.ss_wav.base=e->ss_wav.base;
 304                         sse.ss_wav.min=e->ss_wav.min;
 305                         sse.ss_wav.max=e->ss_wav.max;
 306
 307                         add_ss_ev(&sse);
 308                         break;
 309
 310                 case SONG_EV_SS_PAT:
 311
 312                         sse.ss_pat.file=e->ss_pat.file;
 313
 314                         add_ss_ev(&sse);
 315                         break;
 316
 317                 case SONG_EV_SS_SUSTAIN:
 318                 case SONG_EV_SS_CHANNEL_MAP:
 319
 320                         break;
 321
 322                 case SONG_EV_SS_EFF_DELAY:
 323                 case SONG_EV_SS_EFF_ECHO:
 324                 case SONG_EV_SS_EFF_COMB:
 325                 case SONG_EV_SS_EFF_ALLPASS:
 326                 case SONG_EV_SS_EFF_FLANGER:
 327                 case SONG_EV_SS_EFF_WOBBLE:
 328                 case SONG_EV_SS_EFF_SQWOBBLE:
 329                 case SONG_EV_SS_EFF_FADER:
 330                 case SONG_EV_SS_EFF_REVERB:
 331
 332                         sse.ss_eff.channel=e->ss_eff.channel;
 333                         sse.ss_eff.size=e->ss_eff.size;
 334                         sse.ss_eff.gain=e->ss_eff.gain;
 335                         sse.ss_eff.depth=e->ss_eff.depth;
 336                         sse.ss_eff.freq=e->ss_eff.freq;
 337                         sse.ss_eff.phase=e->ss_eff.phase;
 338                         sse.ss_eff.initial=e->ss_eff.initial;
 339                         sse.ss_eff.final=e->ss_eff.final;
 340
 341                         add_ss_ev(&sse);
 342                         break;
 343
 344                 case SONG_EV_NOTE_ON:
 345                 case SONG_EV_NOTE_OFF:
 346                 case SONG_EV_END:
 347
 348                         /* never found in generic song streams */
 349                         break;
 350                 }
 351         }
 352
 353         /* generates an end of event mark, a time after the last one */
 354         sse.generic.type=SONG_EV_END;
 355         sse.generic.frame=frame + _frequency;
 356         add_ss_ev(&sse);
 357
 358         /* finally sort */
 359         qsort(_ss_song, _n_ss_ev, sizeof(union ss_ev), _ss_ev_cmp);
 360
 361         /* return the number of tracks */
 362         return(b_track + 1);
 363 }
 364
 365
 366 int generate_ss_song(void)
 367 {
 368         union ss_ev * e;
 369         int frame;
 370         int go;
 371         int n;
 372         float output[CHANNELS];
 373         int n_tracks;
 374         struct ss_ins * i;
 375
 376         /* convert the song to ss events */
 377         n_tracks=_ss_song_convert_events();
 378
 379         frame=0;
 380         go=1;
 381         e=_ss_song;
 382
 383         /* init the instruments */
 384         for(n=0;n < n_tracks;n++)
 385                 ss_ins_init(&song_ins[n], n);
 386
 387         /* loop the events */
 388         while(go)
 389         {
 390                 /* process all events for this exact frame */
 391                 while(e->generic.frame == frame)
 392                 {
 393                         /* take the instrument */
 394                         if(e->generic.trk_id == -1)
 395                                 i=NULL;
 396                         else
 397                                 i=&song_ins[e->generic.trk_id];
 398
 399                         switch(e->generic.type)
 400                         {
 401                         case SONG_EV_NOTE_ON:
 402
 403                                 ss_ins_note_on(i, e->note_on.note,
 404                                         e->note_on.vol, e->note_on.note_id);
 405
 406                                 break;
 407
 408                         case SONG_EV_SS_NOTE_ON_BY_TIME:
 409
 410                                 break;
 411
 412                         case SONG_EV_NOTE_OFF:
 413
 414                                 ss_ins_note_off(i, e->note_off.note_id);
 415
 416                                 break;
 417
 418                         case SONG_EV_SS_SUSTAIN:
 419                         case SONG_EV_SS_CHANNEL_MAP:
 420
 421                                 break;
 422
 423                         case SONG_EV_SS_WAV:
 424
 425                                 break;
 426
 427                         case SONG_EV_SS_PAT:
 428
 429                                 load_pat_file(i, e->ss_pat.file);
 430                                 break;
 431
 432                         case SONG_EV_END:
 433
 434                                 go=0;
 435                                 break;
 436
 437                         case SONG_EV_NOTE:
 438                         case SONG_EV_TEMPO:
 439                         case SONG_EV_METER:
 440                         case SONG_EV_MEASURE:
 441
 442                                 /* never found in ss song streams */
 443                                 break;
 444                         }
 445
 446                         /* next event */
 447                         e++;
 448                 }
 449
 450                 /* reset frame samples */
 451                 output_init_frame(output);
 452
 453                 /* generate output from all instruments */
 454                 for(n=0;n < n_tracks;n++)
 455                         ss_ins_frame(&song_ins[n], output);
 456
 457                 /* dump to sampling driver */
 458                 output_write(output);
 459
 460                 /* next frame */
 461                 frame++;
 462         }
 463
 464         return(0);
 465 }