snd_mem.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // snd_mem.c: sound caching
  21
  22 #include "quakedef.h"
  23
  24 qbyte *S_Alloc (int size);
  25
  26 /*
  27 ================
  28 ResampleSfx
  29 ================
  30 */
  31 void ResampleSfx (sfxcache_t *sc, qbyte *data, char *name)
  32 {
  33         int i, outcount, srcsample, srclength, samplefrac, fracstep;
  34
  35         // this is usually 0.5 (128), 1 (256), or 2 (512)
  36         fracstep = ((double) sc->speed / (double) shm->speed) * 256.0;
  37
  38         srclength = sc->length << sc->stereo;
  39
  40         outcount = (double) sc->length * (double) shm->speed / (double) sc->speed;
  41         sc->length = outcount;
  42         if (sc->loopstart != -1)
  43                 sc->loopstart = (double) sc->loopstart * (double) shm->speed / (double) sc->speed;
  44
  45         sc->speed = shm->speed;
  46
  47 // resample / decimate to the current source rate
  48
  49         if (fracstep == 256)
  50         {
  51                 if (sc->width == 1) // 8bit
  52                         for (i = 0;i < srclength;i++)
  53                                 ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
  54                 else //if (sc->width == 2) // 16bit
  55                         for (i = 0;i < srclength;i++)
  56                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  57         }
  58         else
  59         {
  60 // general case
  61                 Con_DPrintf("ResampleSfx: resampling sound %s\n", name);
  62                 samplefrac = 0;
  63                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
  64                 {
  65                         srcsample = 0;
  66                         fracstep >>= 8;
  67                         if (sc->width == 2)
  68                         {
  69                                 short *out = (void *)sc->data, *in = (void *)data;
  70                                 if (sc->stereo) // LordHavoc: stereo sound support
  71                                 {
  72                                         fracstep <<= 1;
  73                                         for (i=0 ; i<outcount ; i++)
  74                                         {
  75                                                 *out++ = LittleShort (in[srcsample  ]);
  76                                                 *out++ = LittleShort (in[srcsample+1]);
  77                                                 srcsample += fracstep;
  78                                         }
  79                                 }
  80                                 else
  81                                 {
  82                                         for (i=0 ; i<outcount ; i++)
  83                                         {
  84                                                 *out++ = LittleShort (in[srcsample  ]);
  85                                                 srcsample += fracstep;
  86                                         }
  87                                 }
  88                         }
  89                         else
  90                         {
  91                                 signed char *out = (void *)sc->data;
  92                                 unsigned char *in = (void *)data;
  93                                 if (sc->stereo) // LordHavoc: stereo sound support
  94                                 {
  95                                         fracstep <<= 1;
  96                                         for (i=0 ; i<outcount ; i++)
  97                                         {
  98                                                 *out++ = in[srcsample  ] - 128;
  99                                                 *out++ = in[srcsample+1] - 128;
 100                                                 srcsample += fracstep;
 101                                         }
 102                                 }
 103                                 else
 104                                 {
 105                                         for (i=0 ; i<outcount ; i++)
 106                                         {
 107                                                 *out++ = in[srcsample  ] - 128;
 108                                                 srcsample += fracstep;
 109                                         }
 110                                 }
 111                         }
 112                 }
 113                 else
 114                 {
 115                         int sample;
 116                         int a, b;
 117                         if (sc->width == 2)
 118                         {
 119                                 short *out = (void *)sc->data, *in = (void *)data;
 120                                 if (sc->stereo) // LordHavoc: stereo sound support
 121                                 {
 122                                         for (i=0 ; i<outcount ; i++)
 123                                         {
 124                                                 srcsample = (samplefrac >> 8) << 1;
 125                                                 a = in[srcsample  ];
 126                                                 if (srcsample+2 >= srclength)
 127                                                         b = 0;
 128                                                 else
 129                                                         b = in[srcsample+2];
 130                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 131                                                 *out++ = (short) sample;
 132                                                 a = in[srcsample+1];
 133                                                 if (srcsample+2 >= srclength)
 134                                                         b = 0;
 135                                                 else
 136                                                         b = in[srcsample+3];
 137                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 138                                                 *out++ = (short) sample;
 139                                                 samplefrac += fracstep;
 140                                         }
 141                                 }
 142                                 else
 143                                 {
 144                                         for (i=0 ; i<outcount ; i++)
 145                                         {
 146                                                 srcsample = samplefrac >> 8;
 147                                                 a = in[srcsample  ];
 148                                                 if (srcsample+1 >= srclength)
 149                                                         b = 0;
 150                                                 else
 151                                                         b = in[srcsample+1];
 152                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 153                                                 *out++ = (short) sample;
 154                                                 samplefrac += fracstep;
 155                                         }
 156                                 }
 157                         }
 158                         else
 159                         {
 160                                 signed char *out = (void *)sc->data;
 161                                 unsigned char *in = (void *)data;
 162                                 if (sc->stereo) // LordHavoc: stereo sound support
 163                                 {
 164                                         for (i=0 ; i<outcount ; i++)
 165                                         {
 166                                                 srcsample = (samplefrac >> 8) << 1;
 167                                                 a = (int) in[srcsample  ] - 128;
 168                                                 if (srcsample+2 >= srclength)
 169                                                         b = 0;
 170                                                 else
 171                                                         b = (int) in[srcsample+2] - 128;
 172                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 173                                                 *out++ = (signed char) sample;
 174                                                 a = (int) in[srcsample+1] - 128;
 175                                                 if (srcsample+2 >= srclength)
 176                                                         b = 0;
 177                                                 else
 178                                                         b = (int) in[srcsample+3] - 128;
 179                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 180                                                 *out++ = (signed char) sample;
 181                                                 samplefrac += fracstep;
 182                                         }
 183                                 }
 184                                 else
 185                                 {
 186                                         for (i=0 ; i<outcount ; i++)
 187                                         {
 188                                                 srcsample = samplefrac >> 8;
 189                                                 a = (int) in[srcsample  ] - 128;
 190                                                 if (srcsample+1 >= srclength)
 191                                                         b = 0;
 192                                                 else
 193                                                         b = (int) in[srcsample+1] - 128;
 194                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 195                                                 *out++ = (signed char) sample;
 196                                                 samplefrac += fracstep;
 197                                         }
 198                                 }
 199                         }
 200                 }
 201         }
 202
 203         // LordHavoc: use this for testing if it ever becomes useful again
 204 #if 0
 205         COM_WriteFile (va("sound/%s.pcm", name), sc->data, (sc->length << sc->stereo) * sc->width);
 206 #endif
 207 }
 208
 209 //=============================================================================
 210
 211 /*
 212 ==============
 213 S_LoadSound
 214 ==============
 215 */
 216 sfxcache_t *S_LoadSound (sfx_t *s)
 217 {
 218     char        namebuffer[256];
 219         qbyte   *data;
 220         wavinfo_t       info;
 221         int             len;
 222         sfxcache_t      *sc;
 223
 224 // see if still in memory
 225         if (s->sfxcache)
 226                 return s->sfxcache;
 227
 228 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
 229 // load it in
 230         strcpy(namebuffer, "sound/");
 231         strcat(namebuffer, s->name);
 232
 233 //      Con_Printf ("loading %s\n",namebuffer);
 234
 235         data = COM_LoadFile(namebuffer, false);
 236
 237         if (!data)
 238         {
 239                 Con_Printf ("Couldn't load %s\n", namebuffer);
 240                 return NULL;
 241         }
 242
 243         info = GetWavinfo (s->name, data, com_filesize);
 244         // LordHavoc: stereo sounds are now allowed (intended for music)
 245         if (info.channels < 1 || info.channels > 2)
 246         {
 247                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 248                 Mem_Free(data);
 249                 return NULL;
 250         }
 251         /*
 252         if (info.channels != 1)
 253         {
 254                 Con_Printf ("%s is a stereo sample\n",s->name);
 255                 return NULL;
 256         }
 257         */
 258
 259         // calculate resampled length
 260         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
 261         len = len * info.width * info.channels;
 262
 263         // FIXME: add S_UnloadSounds or something?
 264         Mem_FreePool(&s->mempool);
 265         s->mempool = Mem_AllocPool(s->name);
 266         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
 267         if (!sc)
 268         {
 269                 Mem_FreePool(&s->mempool);
 270                 Mem_Free(data);
 271                 return NULL;
 272         }
 273
 274         sc->length = info.samples;
 275         sc->loopstart = info.loopstart;
 276         sc->speed = info.rate;
 277         sc->width = info.width;
 278         sc->stereo = info.channels == 2;
 279
 280         ResampleSfx (sc, data + info.dataofs, s->name);
 281
 282         Mem_Free(data);
 283         return sc;
 284 }
 285
 286
 287
 288 /*
 289 ===============================================================================
 290
 291 WAV loading
 292
 293 ===============================================================================
 294 */
 295
 296
 297 qbyte   *data_p;
 298 qbyte   *iff_end;
 299 qbyte   *last_chunk;
 300 qbyte   *iff_data;
 301 int     iff_chunk_len;
 302
 303
 304 short GetLittleShort(void)
 305 {
 306         short val = 0;
 307         val = *data_p;
 308         val = val + (*(data_p+1)<<8);
 309         data_p += 2;
 310         return val;
 311 }
 312
 313 int GetLittleLong(void)
 314 {
 315         int val = 0;
 316         val = *data_p;
 317         val = val + (*(data_p+1)<<8);
 318         val = val + (*(data_p+2)<<16);
 319         val = val + (*(data_p+3)<<24);
 320         data_p += 4;
 321         return val;
 322 }
 323
 324 void FindNextChunk(char *name)
 325 {
 326         while (1)
 327         {
 328                 data_p=last_chunk;
 329
 330                 if (data_p >= iff_end)
 331                 {       // didn't find the chunk
 332                         data_p = NULL;
 333                         return;
 334                 }
 335
 336                 data_p += 4;
 337                 iff_chunk_len = GetLittleLong();
 338                 if (iff_chunk_len < 0)
 339                 {
 340                         data_p = NULL;
 341                         return;
 342                 }
 343 //              if (iff_chunk_len > 1024*1024)
 344 //                      Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
 345                 data_p -= 8;
 346                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 347                 if (!strncmp(data_p, name, 4))
 348                         return;
 349         }
 350 }
 351
 352 void FindChunk(char *name)
 353 {
 354         last_chunk = iff_data;
 355         FindNextChunk (name);
 356 }
 357
 358
 359 void DumpChunks(void)
 360 {
 361         char    str[5];
 362
 363         str[4] = 0;
 364         data_p=iff_data;
 365         do
 366         {
 367                 memcpy (str, data_p, 4);
 368                 data_p += 4;
 369                 iff_chunk_len = GetLittleLong();
 370                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 371                 data_p += (iff_chunk_len + 1) & ~1;
 372         } while (data_p < iff_end);
 373 }
 374
 375 /*
 376 ============
 377 GetWavinfo
 378 ============
 379 */
 380 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
 381 {
 382         wavinfo_t       info;
 383         int     i;
 384         int     format;
 385         int             samples;
 386
 387         memset (&info, 0, sizeof(info));
 388
 389         if (!wav)
 390                 return info;
 391
 392         iff_data = wav;
 393         iff_end = wav + wavlength;
 394
 395 // find "RIFF" chunk
 396         FindChunk("RIFF");
 397         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 398         {
 399                 Con_Printf("Missing RIFF/WAVE chunks\n");
 400                 return info;
 401         }
 402
 403 // get "fmt " chunk
 404         iff_data = data_p + 12;
 405 // DumpChunks ();
 406
 407         FindChunk("fmt ");
 408         if (!data_p)
 409         {
 410                 Con_Printf("Missing fmt chunk\n");
 411                 return info;
 412         }
 413         data_p += 8;
 414         format = GetLittleShort();
 415         if (format != 1)
 416         {
 417                 Con_Printf("Microsoft PCM format only\n");
 418                 return info;
 419         }
 420
 421         info.channels = GetLittleShort();
 422         info.rate = GetLittleLong();
 423         data_p += 4+2;
 424         info.width = GetLittleShort() / 8;
 425
 426 // get cue chunk
 427         FindChunk("cue ");
 428         if (data_p)
 429         {
 430                 data_p += 32;
 431                 info.loopstart = GetLittleLong();
 432 //              Con_Printf("loopstart=%d\n", sfx->loopstart);
 433
 434         // if the next chunk is a LIST chunk, look for a cue length marker
 435                 FindNextChunk ("LIST");
 436                 if (data_p)
 437                 {
 438                         if (!strncmp (data_p + 28, "mark", 4))
 439                         {       // this is not a proper parse, but it works with cooledit...
 440                                 data_p += 24;
 441                                 i = GetLittleLong ();   // samples in loop
 442                                 info.samples = info.loopstart + i;
 443 //                              Con_Printf("looped length: %i\n", i);
 444                         }
 445                 }
 446         }
 447         else
 448                 info.loopstart = -1;
 449
 450 // find data chunk
 451         FindChunk("data");
 452         if (!data_p)
 453         {
 454                 Con_Printf("Missing data chunk\n");
 455                 return info;
 456         }
 457
 458         data_p += 4;
 459         samples = GetLittleLong () / info.width / info.channels;
 460
 461         if (info.samples)
 462         {
 463                 if (samples < info.samples)
 464                         Host_Error ("Sound %s has a bad loop length", name);
 465         }
 466         else
 467                 info.samples = samples;
 468
 469         info.dataofs = data_p - wav;
 470
 471         return info;
 472 }
 473