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 (sfx_t *sfx, int inrate, qbyte *data, char *name)
  32 {
  33         int             outcount;
  34         int             srcsample, srclength;
  35         float   stepscale;
  36         int             i;
  37         int             samplefrac, fracstep;
  38         sfxcache_t      *sc;
  39
  40         sc = sfx->sfxcache;
  41         if (!sc)
  42                 return;
  43
  44         stepscale = (float)inrate / shm->speed; // this is usually 0.5, 1, or 2
  45
  46         srclength = sc->length << sc->stereo;
  47
  48         outcount = sc->length / stepscale;
  49         sc->length = outcount;
  50         if (sc->loopstart != -1)
  51                 sc->loopstart = sc->loopstart / stepscale;
  52
  53         sc->speed = shm->speed;
  54 //      if (loadas8bit.value)
  55 //              sc->width = 1;
  56 //      else
  57 //              sc->width = inwidth;
  58 //      sc->stereo = 0;
  59
  60 // resample / decimate to the current source rate
  61
  62         if (stepscale == 1/* && inwidth == 1*/ && sc->width == 1)
  63         {
  64 // fast special case
  65                 /*
  66                 // LordHavoc: I do not serve the readability gods...
  67                 int *indata, *outdata;
  68                 int count4, count1;
  69                 count1 = outcount << sc->stereo;
  70                 count4 = count1 >> 2;
  71                 indata = (void *)data;
  72                 outdata = (void *)sc->data;
  73                 while (count4--)
  74                         *outdata++ = *indata++ ^ 0x80808080;
  75                 if (count1 & 2)
  76                         ((short*)outdata)[0] = ((short*)indata)[0] ^ 0x8080;
  77                 if (count1 & 1)
  78                         ((char*)outdata)[2] = ((char*)indata)[2] ^ 0x80;
  79                 */
  80                 if (sc->stereo) // LordHavoc: stereo sound support
  81                         outcount *= 2;
  82                 for (i=0 ; i<outcount ; i++)
  83                         ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
  84         }
  85         else if (stepscale == 1/* && inwidth == 2*/ && sc->width == 2) // LordHavoc: quick case for 16bit
  86         {
  87                 if (sc->stereo) // LordHavoc: stereo sound support
  88                         outcount *= 2;
  89                 for (i=0 ; i<outcount ;i++)
  90                         ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  91         }
  92         else
  93         {
  94 // general case
  95                 Con_DPrintf("ResampleSfx: resampling sound %s\n", sfx->name);
  96                 samplefrac = 0;
  97                 fracstep = stepscale*256;
  98                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
  99                 {
 100                         srcsample = 0;
 101                         fracstep >>= 8;
 102                         if (sc->width == 2)
 103                         {
 104                                 short *out = (void *)sc->data, *in = (void *)data;
 105                                 if (sc->stereo) // LordHavoc: stereo sound support
 106                                 {
 107                                         fracstep <<= 1;
 108                                         for (i=0 ; i<outcount ; i++)
 109                                         {
 110                                                 *out++ = LittleShort (in[srcsample  ]);
 111                                                 *out++ = LittleShort (in[srcsample+1]);
 112                                                 srcsample += fracstep;
 113                                         }
 114                                 }
 115                                 else
 116                                 {
 117                                         for (i=0 ; i<outcount ; i++)
 118                                         {
 119                                                 *out++ = LittleShort (in[srcsample  ]);
 120                                                 srcsample += fracstep;
 121                                         }
 122                                 }
 123                         }
 124                         else
 125                         {
 126                                 signed char *out = (void *)sc->data;
 127                                 unsigned char *in = (void *)data;
 128                                 if (sc->stereo) // LordHavoc: stereo sound support
 129                                 {
 130                                         fracstep <<= 1;
 131                                         for (i=0 ; i<outcount ; i++)
 132                                         {
 133                                                 *out++ = in[srcsample  ] - 128;
 134                                                 *out++ = in[srcsample+1] - 128;
 135                                                 srcsample += fracstep;
 136                                         }
 137                                 }
 138                                 else
 139                                 {
 140                                         for (i=0 ; i<outcount ; i++)
 141                                         {
 142                                                 *out++ = in[srcsample  ] - 128;
 143                                                 srcsample += fracstep;
 144                                         }
 145                                 }
 146                         }
 147                 }
 148                 else
 149                 {
 150                         int sample;
 151                         int a, b;
 152                         if (sc->width == 2)
 153                         {
 154                                 short *out = (void *)sc->data, *in = (void *)data;
 155                                 if (sc->stereo) // LordHavoc: stereo sound support
 156                                 {
 157                                         for (i=0 ; i<outcount ; i++)
 158                                         {
 159                                                 srcsample = (samplefrac >> 8) << 1;
 160                                                 a = in[srcsample  ];
 161                                                 if (srcsample+2 >= srclength)
 162                                                         b = 0;
 163                                                 else
 164                                                         b = in[srcsample+2];
 165                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 166                                                 *out++ = (short) sample;
 167                                                 a = in[srcsample+1];
 168                                                 if (srcsample+2 >= srclength)
 169                                                         b = 0;
 170                                                 else
 171                                                         b = in[srcsample+3];
 172                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 173                                                 *out++ = (short) sample;
 174                                                 samplefrac += fracstep;
 175                                         }
 176                                 }
 177                                 else
 178                                 {
 179                                         for (i=0 ; i<outcount ; i++)
 180                                         {
 181                                                 srcsample = samplefrac >> 8;
 182                                                 a = in[srcsample  ];
 183                                                 if (srcsample+1 >= srclength)
 184                                                         b = 0;
 185                                                 else
 186                                                         b = in[srcsample+1];
 187                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 188                                                 *out++ = (short) sample;
 189                                                 samplefrac += fracstep;
 190                                         }
 191                                 }
 192                         }
 193                         else
 194                         {
 195                                 signed char *out = (void *)sc->data;
 196                                 unsigned char *in = (void *)data;
 197                                 if (sc->stereo) // LordHavoc: stereo sound support
 198                                 {
 199                                         for (i=0 ; i<outcount ; i++)
 200                                         {
 201                                                 srcsample = (samplefrac >> 8) << 1;
 202                                                 a = (int) in[srcsample  ] - 128;
 203                                                 if (srcsample+2 >= srclength)
 204                                                         b = 0;
 205                                                 else
 206                                                         b = (int) in[srcsample+2] - 128;
 207                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 208                                                 *out++ = (signed char) sample;
 209                                                 a = (int) in[srcsample+1] - 128;
 210                                                 if (srcsample+2 >= srclength)
 211                                                         b = 0;
 212                                                 else
 213                                                         b = (int) in[srcsample+3] - 128;
 214                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 215                                                 *out++ = (signed char) sample;
 216                                                 samplefrac += fracstep;
 217                                         }
 218                                 }
 219                                 else
 220                                 {
 221                                         for (i=0 ; i<outcount ; i++)
 222                                         {
 223                                                 srcsample = samplefrac >> 8;
 224                                                 a = (int) in[srcsample  ] - 128;
 225                                                 if (srcsample+1 >= srclength)
 226                                                         b = 0;
 227                                                 else
 228                                                         b = (int) in[srcsample+1] - 128;
 229                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 230                                                 *out++ = (signed char) sample;
 231                                                 samplefrac += fracstep;
 232                                         }
 233                                 }
 234                         }
 235                 }
 236         }
 237
 238         // LordHavoc: use this for testing if it ever becomes useful again
 239 #if 0
 240         COM_WriteFile (va("sound/%s.pcm", name), sc->data, (sc->length << sc->stereo) * sc->width);
 241 #endif
 242 }
 243
 244 //=============================================================================
 245
 246 /*
 247 ==============
 248 S_LoadSound
 249 ==============
 250 */
 251 sfxcache_t *S_LoadSound (sfx_t *s)
 252 {
 253     char        namebuffer[256];
 254         qbyte   *data;
 255         wavinfo_t       info;
 256         int             len;
 257         float   stepscale;
 258         sfxcache_t      *sc;
 259
 260 // see if still in memory
 261         if (s->sfxcache)
 262                 return s->sfxcache;
 263
 264 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
 265 // load it in
 266         strcpy(namebuffer, "sound/");
 267         strcat(namebuffer, s->name);
 268
 269 //      Con_Printf ("loading %s\n",namebuffer);
 270
 271         data = COM_LoadFile(namebuffer, false);
 272
 273         if (!data)
 274         {
 275                 Con_Printf ("Couldn't load %s\n", namebuffer);
 276                 return NULL;
 277         }
 278
 279         info = GetWavinfo (s->name, data, com_filesize);
 280         // LordHavoc: stereo sounds are now allowed (intended for music)
 281         if (info.channels < 1 || info.channels > 2)
 282         {
 283                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 284                 Mem_Free(data);
 285                 return NULL;
 286         }
 287         /*
 288         if (info.channels != 1)
 289         {
 290                 Con_Printf ("%s is a stereo sample\n",s->name);
 291                 return NULL;
 292         }
 293         */
 294
 295         stepscale = (float)info.rate / shm->speed;
 296         len = info.samples / stepscale;
 297
 298         len = len * info.width * info.channels;
 299
 300         // FIXME: add S_UnloadSounds or something?
 301         Mem_FreePool(&s->mempool);
 302         s->mempool = Mem_AllocPool(s->name);
 303         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
 304         if (!sc)
 305         {
 306                 Mem_Free(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         Mem_Free(data);
 319         return sc;
 320 }
 321
 322
 323
 324 /*
 325 ===============================================================================
 326
 327 WAV loading
 328
 329 ===============================================================================
 330 */
 331
 332
 333 qbyte   *data_p;
 334 qbyte   *iff_end;
 335 qbyte   *last_chunk;
 336 qbyte   *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, qbyte *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