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 int                     cache_full_cycle;
  25
  26 byte *S_Alloc (int size);
  27
  28 /*
  29 ================
  30 ResampleSfx
  31 ================
  32 */
  33 void ResampleSfx (sfx_t *sfx, int inrate, byte *data, char *name)
  34 {
  35         int             outcount;
  36         int             srcsample, srclength;
  37         float   stepscale;
  38         int             i;
  39         int             samplefrac, fracstep;
  40         sfxcache_t      *sc;
  41
  42         sc = Cache_Check (&sfx->cache);
  43         if (!sc)
  44                 return;
  45
  46         stepscale = (float)inrate / shm->speed; // this is usually 0.5, 1, or 2
  47
  48         srclength = sc->length << sc->stereo;
  49
  50         outcount = sc->length / stepscale;
  51         sc->length = outcount;
  52         if (sc->loopstart != -1)
  53                 sc->loopstart = sc->loopstart / stepscale;
  54
  55         sc->speed = shm->speed;
  56 //      if (loadas8bit.value)
  57 //              sc->width = 1;
  58 //      else
  59 //              sc->width = inwidth;
  60 //      sc->stereo = 0;
  61
  62 // resample / decimate to the current source rate
  63
  64         if (stepscale == 1/* && inwidth == 1*/ && sc->width == 1)
  65         {
  66 // fast special case
  67                 /*
  68                 // LordHavoc: I do not serve the readability gods...
  69                 int *indata, *outdata;
  70                 int count4, count1;
  71                 count1 = outcount << sc->stereo;
  72                 count4 = count1 >> 2;
  73                 indata = (void *)data;
  74                 outdata = (void *)sc->data;
  75                 while (count4--)
  76                         *outdata++ = *indata++ ^ 0x80808080;
  77                 if (count1 & 2)
  78                         ((short*)outdata)[0] = ((short*)indata)[0] ^ 0x8080;
  79                 if (count1 & 1)
  80                         ((char*)outdata)[2] = ((char*)indata)[2] ^ 0x80;
  81                 */
  82                 if (sc->stereo) // LordHavoc: stereo sound support
  83                         outcount *= 2;
  84                 for (i=0 ; i<outcount ; i++)
  85                         ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
  86         }
  87         else if (stepscale == 1/* && inwidth == 2*/ && sc->width == 2) // LordHavoc: quick case for 16bit
  88         {
  89                 if (sc->stereo) // LordHavoc: stereo sound support
  90                         outcount *= 2;
  91                 for (i=0 ; i<outcount ;i++)
  92                         ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  93         }
  94         else
  95         {
  96 // general case
  97                 Con_DPrintf("ResampleSfx: resampling sound %s\n", sfx->name);
  98                 samplefrac = 0;
  99                 fracstep = stepscale*256;
 100                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
 101                 {
 102                         srcsample = 0;
 103                         fracstep >>= 8;
 104                         if (sc->width == 2)
 105                         {
 106                                 short *out = (void *)sc->data, *in = (void *)data;
 107                                 if (sc->stereo) // LordHavoc: stereo sound support
 108                                 {
 109                                         fracstep <<= 1;
 110                                         for (i=0 ; i<outcount ; i++)
 111                                         {
 112                                                 *out++ = LittleShort (in[srcsample  ]);
 113                                                 *out++ = LittleShort (in[srcsample+1]);
 114                                                 srcsample += fracstep;
 115                                         }
 116                                 }
 117                                 else
 118                                 {
 119                                         for (i=0 ; i<outcount ; i++)
 120                                         {
 121                                                 *out++ = LittleShort (in[srcsample  ]);
 122                                                 srcsample += fracstep;
 123                                         }
 124                                 }
 125                         }
 126                         else
 127                         {
 128                                 signed char *out = (void *)sc->data;
 129                                 unsigned char *in = (void *)data;
 130                                 if (sc->stereo) // LordHavoc: stereo sound support
 131                                 {
 132                                         fracstep <<= 1;
 133                                         for (i=0 ; i<outcount ; i++)
 134                                         {
 135                                                 *out++ = in[srcsample  ] - 128;
 136                                                 *out++ = in[srcsample+1] - 128;
 137                                                 srcsample += fracstep;
 138                                         }
 139                                 }
 140                                 else
 141                                 {
 142                                         for (i=0 ; i<outcount ; i++)
 143                                         {
 144                                                 *out++ = in[srcsample  ] - 128;
 145                                                 srcsample += fracstep;
 146                                         }
 147                                 }
 148                         }
 149                 }
 150                 else
 151                 {
 152                         int sample;
 153                         int a, b;
 154                         if (sc->width == 2)
 155                         {
 156                                 short *out = (void *)sc->data, *in = (void *)data;
 157                                 if (sc->stereo) // LordHavoc: stereo sound support
 158                                 {
 159                                         for (i=0 ; i<outcount ; i++)
 160                                         {
 161                                                 srcsample = (samplefrac >> 8) << 1;
 162                                                 a = in[srcsample  ];
 163                                                 if (srcsample+2 >= srclength)
 164                                                         b = 0;
 165                                                 else
 166                                                         b = in[srcsample+2];
 167                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 168                                                 *out++ = (short) sample;
 169                                                 a = in[srcsample+1];
 170                                                 if (srcsample+2 >= srclength)
 171                                                         b = 0;
 172                                                 else
 173                                                         b = in[srcsample+3];
 174                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 175                                                 *out++ = (short) sample;
 176                                                 samplefrac += fracstep;
 177                                         }
 178                                 }
 179                                 else
 180                                 {
 181                                         for (i=0 ; i<outcount ; i++)
 182                                         {
 183                                                 srcsample = samplefrac >> 8;
 184                                                 a = in[srcsample  ];
 185                                                 if (srcsample+1 >= srclength)
 186                                                         b = 0;
 187                                                 else
 188                                                         b = in[srcsample+1];
 189                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 190                                                 *out++ = (short) sample;
 191                                                 samplefrac += fracstep;
 192                                         }
 193                                 }
 194                         }
 195                         else
 196                         {
 197                                 signed char *out = (void *)sc->data;
 198                                 unsigned char *in = (void *)data;
 199                                 if (sc->stereo) // LordHavoc: stereo sound support
 200                                 {
 201                                         for (i=0 ; i<outcount ; i++)
 202                                         {
 203                                                 srcsample = (samplefrac >> 8) << 1;
 204                                                 a = (int) in[srcsample  ] - 128;
 205                                                 if (srcsample+2 >= srclength)
 206                                                         b = 0;
 207                                                 else
 208                                                         b = (int) in[srcsample+2] - 128;
 209                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 210                                                 *out++ = (signed char) sample;
 211                                                 a = (int) in[srcsample+1] - 128;
 212                                                 if (srcsample+2 >= srclength)
 213                                                         b = 0;
 214                                                 else
 215                                                         b = (int) in[srcsample+3] - 128;
 216                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 217                                                 *out++ = (signed char) sample;
 218                                                 samplefrac += fracstep;
 219                                         }
 220                                 }
 221                                 else
 222                                 {
 223                                         for (i=0 ; i<outcount ; i++)
 224                                         {
 225                                                 srcsample = samplefrac >> 8;
 226                                                 a = (int) in[srcsample  ] - 128;
 227                                                 if (srcsample+1 >= srclength)
 228                                                         b = 0;
 229                                                 else
 230                                                         b = (int) in[srcsample+1] - 128;
 231                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 232                                                 *out++ = (signed char) sample;
 233                                                 samplefrac += fracstep;
 234                                         }
 235                                 }
 236                         }
 237                 }
 238         }
 239
 240         // LordHavoc: use this for testing if it ever becomes useful again
 241 #if 0
 242         COM_WriteFile (va("sound/%s.pcm", name), sc->data, (sc->length << sc->stereo) * sc->width);
 243 #endif
 244 }
 245
 246 //=============================================================================
 247
 248 /*
 249 ==============
 250 S_LoadSound
 251 ==============
 252 */
 253 sfxcache_t *S_LoadSound (sfx_t *s)
 254 {
 255     char        namebuffer[256];
 256         byte    *data;
 257         wavinfo_t       info;
 258         int             len;
 259         float   stepscale;
 260         sfxcache_t      *sc;
 261
 262 // see if still in memory
 263         sc = Cache_Check (&s->cache);
 264         if (sc)
 265                 return sc;
 266
 267 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
 268 // load it in
 269         strcpy(namebuffer, "sound/");
 270         strcat(namebuffer, s->name);
 271
 272 //      Con_Printf ("loading %s\n",namebuffer);
 273
 274         data = COM_LoadMallocFile(namebuffer, false);
 275
 276         if (!data)
 277         {
 278                 Con_Printf ("Couldn't load %s\n", namebuffer);
 279                 return NULL;
 280         }
 281
 282         info = GetWavinfo (s->name, data, com_filesize);
 283         // LordHavoc: stereo sounds are now allowed (intended for music)
 284         if (info.channels < 1 || info.channels > 2)
 285         {
 286                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 287                 qfree(data);
 288                 return NULL;
 289         }
 290         /*
 291         if (info.channels != 1)
 292         {
 293                 Con_Printf ("%s is a stereo sample\n",s->name);
 294                 return NULL;
 295         }
 296         */
 297
 298         stepscale = (float)info.rate / shm->speed;
 299         len = info.samples / stepscale;
 300
 301         len = len * info.width * info.channels;
 302
 303         sc = Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name);
 304         if (!sc)
 305         {
 306                 qfree(data);
 307                 return NULL;
 308         }
 309
 310         sc->length = info.samples;
 311         sc->loopstart = info.loopstart;
 312         sc->speed = info.rate;
 313         sc->width = info.width;
 314         sc->stereo = info.channels == 2;
 315
 316         ResampleSfx (s, sc->speed, data + info.dataofs, s->name);
 317
 318         qfree(data);
 319         return sc;
 320 }
 321
 322
 323
 324 /*
 325 ===============================================================================
 326
 327 WAV loading
 328
 329 ===============================================================================
 330 */
 331
 332
 333 byte    *data_p;
 334 byte    *iff_end;
 335 byte    *last_chunk;
 336 byte    *iff_data;
 337 int     iff_chunk_len;
 338
 339
 340 short GetLittleShort(void)
 341 {
 342         short val = 0;
 343         val = *data_p;
 344         val = val + (*(data_p+1)<<8);
 345         data_p += 2;
 346         return val;
 347 }
 348
 349 int GetLittleLong(void)
 350 {
 351         int val = 0;
 352         val = *data_p;
 353         val = val + (*(data_p+1)<<8);
 354         val = val + (*(data_p+2)<<16);
 355         val = val + (*(data_p+3)<<24);
 356         data_p += 4;
 357         return val;
 358 }
 359
 360 void FindNextChunk(char *name)
 361 {
 362         while (1)
 363         {
 364                 data_p=last_chunk;
 365
 366                 if (data_p >= iff_end)
 367                 {       // didn't find the chunk
 368                         data_p = NULL;
 369                         return;
 370                 }
 371
 372                 data_p += 4;
 373                 iff_chunk_len = GetLittleLong();
 374                 if (iff_chunk_len < 0)
 375                 {
 376                         data_p = NULL;
 377                         return;
 378                 }
 379 //              if (iff_chunk_len > 1024*1024)
 380 //                      Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
 381                 data_p -= 8;
 382                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 383                 if (!strncmp(data_p, name, 4))
 384                         return;
 385         }
 386 }
 387
 388 void FindChunk(char *name)
 389 {
 390         last_chunk = iff_data;
 391         FindNextChunk (name);
 392 }
 393
 394
 395 void DumpChunks(void)
 396 {
 397         char    str[5];
 398
 399         str[4] = 0;
 400         data_p=iff_data;
 401         do
 402         {
 403                 memcpy (str, data_p, 4);
 404                 data_p += 4;
 405                 iff_chunk_len = GetLittleLong();
 406                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 407                 data_p += (iff_chunk_len + 1) & ~1;
 408         } while (data_p < iff_end);
 409 }
 410
 411 /*
 412 ============
 413 GetWavinfo
 414 ============
 415 */
 416 wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
 417 {
 418         wavinfo_t       info;
 419         int     i;
 420         int     format;
 421         int             samples;
 422
 423         memset (&info, 0, sizeof(info));
 424
 425         if (!wav)
 426                 return info;
 427
 428         iff_data = wav;
 429         iff_end = wav + wavlength;
 430
 431 // find "RIFF" chunk
 432         FindChunk("RIFF");
 433         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 434         {
 435                 Con_Printf("Missing RIFF/WAVE chunks\n");
 436                 return info;
 437         }
 438
 439 // get "fmt " chunk
 440         iff_data = data_p + 12;
 441 // DumpChunks ();
 442
 443         FindChunk("fmt ");
 444         if (!data_p)
 445         {
 446                 Con_Printf("Missing fmt chunk\n");
 447                 return info;
 448         }
 449         data_p += 8;
 450         format = GetLittleShort();
 451         if (format != 1)
 452         {
 453                 Con_Printf("Microsoft PCM format only\n");
 454                 return info;
 455         }
 456
 457         info.channels = GetLittleShort();
 458         info.rate = GetLittleLong();
 459         data_p += 4+2;
 460         info.width = GetLittleShort() / 8;
 461
 462 // get cue chunk
 463         FindChunk("cue ");
 464         if (data_p)
 465         {
 466                 data_p += 32;
 467                 info.loopstart = GetLittleLong();
 468 //              Con_Printf("loopstart=%d\n", sfx->loopstart);
 469
 470         // if the next chunk is a LIST chunk, look for a cue length marker
 471                 FindNextChunk ("LIST");
 472                 if (data_p)
 473                 {
 474                         if (!strncmp (data_p + 28, "mark", 4))
 475                         {       // this is not a proper parse, but it works with cooledit...
 476                                 data_p += 24;
 477                                 i = GetLittleLong ();   // samples in loop
 478                                 info.samples = info.loopstart + i;
 479 //                              Con_Printf("looped length: %i\n", i);
 480                         }
 481                 }
 482         }
 483         else
 484                 info.loopstart = -1;
 485
 486 // find data chunk
 487         FindChunk("data");
 488         if (!data_p)
 489         {
 490                 Con_Printf("Missing data chunk\n");
 491                 return info;
 492         }
 493
 494         data_p += 4;
 495         samples = GetLittleLong () / info.width;
 496
 497         if (info.samples)
 498         {
 499                 if (samples < info.samples)
 500                         Host_Error ("Sound %s has a bad loop length", name);
 501         }
 502         else
 503                 info.samples = samples;
 504
 505         info.dataofs = data_p - wav;
 506
 507         return info;
 508 }
 509