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)
  34 {
  35         int             outcount;
  36         int             srcsample;
  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         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                 // LordHavoc: I do not serve the readability gods...
  66                 int *indata, *outdata;
  67                 int count4, count1;
  68                 count1 = outcount << sc->stereo;
  69                 count4 = count1 >> 2;
  70                 indata = (void *)data;
  71                 outdata = (void *)sc->data;
  72                 while (count4--)
  73                         *outdata++ = *indata++ ^ 0x80808080;
  74                 if (count1 & 2)
  75                         ((short*)outdata)[0] = ((short*)indata)[0] ^ 0x8080;
  76                 if (count1 & 1)
  77                         ((char*)outdata)[2] = ((char*)indata)[2] ^ 0x80;
  78                 /*
  79                 if (sc->stereo) // LordHavoc: stereo sound support
  80                 {
  81                         for (i=0 ; i<(outcount<<1) ; i++)
  82                                 ((signed char *)sc->data)[i] = (int)( (unsigned char)(data[i]) - 128);
  83                 }
  84                 else
  85                 {
  86                         for (i=0 ; i<outcount ; i++)
  87                                 ((signed char *)sc->data)[i] = (int)( (unsigned char)(data[i]) - 128);
  88                 }
  89                 */
  90         }
  91         else if (stepscale == 1/* && inwidth == 2*/ && sc->width == 2) // LordHavoc: quick case for 16bit
  92         {
  93                 if (sc->stereo) // LordHavoc: stereo sound support
  94                         for (i=0 ; i<outcount*2 ;i++)
  95                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  96                 else
  97                         for (i=0 ; i<outcount ;i++)
  98                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  99         }
 100         else
 101         {
 102 // general case
 103                 Con_DPrintf("ResampleSfx: resampling sound %s\n", sfx->name);
 104                 samplefrac = 0;
 105                 fracstep = stepscale*256;
 106                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
 107                 {
 108                         samplefrac >> 8;
 109                         srcsample = 0;
 110                         if (sc->width == 2)
 111                         {
 112                                 short *out = (void *)sc->data, *in = (void *)data;
 113                                 if (sc->stereo) // LordHavoc: stereo sound support
 114                                 {
 115                                         fracstep <<= 1;
 116                                         for (i=0 ; i<outcount ;)
 117                                         {
 118                                                 *out++ = (short) LittleShort (in[srcsample  ]);
 119                                                 *out++ = (short) LittleShort (in[srcsample+1]);
 120                                                 srcsample += fracstep;
 121                                         }
 122                                 }
 123                                 else
 124                                 {
 125                                         for (i=0 ; i<outcount ; i++)
 126                                         {
 127                                                 *out++ = (short) LittleShort (in[srcsample  ]);
 128                                                 srcsample += fracstep;
 129                                         }
 130                                 }
 131                         }
 132                         else
 133                         {
 134                                 signed char *out = (void *)sc->data, *in = (void *)data;
 135                                 if (sc->stereo) // LordHavoc: stereo sound support
 136                                 {
 137                                         fracstep <<= 1;
 138                                         for (i=0 ; i<outcount ;)
 139                                         {
 140                                                 *out++ = (signed char) in[srcsample  ] - 128;
 141                                                 *out++ = (signed char) in[srcsample+1] - 128;
 142                                                 srcsample += fracstep;
 143                                         }
 144                                 }
 145                                 else
 146                                 {
 147                                         for (i=0 ; i<outcount ; i++)
 148                                         {
 149                                                 *out++ = (signed char) in[srcsample  ] - 128;
 150                                                 srcsample += fracstep;
 151                                         }
 152                                 }
 153                         }
 154                 }
 155                 else
 156                 {
 157                         if (sc->width == 2)
 158                         {
 159                                 short *out = (void *)sc->data, *in = (void *)data;
 160                                 if (sc->stereo) // LordHavoc: stereo sound support
 161                                 {
 162                                         for (i=0 ; i<outcount ;)
 163                                         {
 164                                                 srcsample = (samplefrac >> 7) & ~1;
 165                                                 samplefrac += fracstep;
 166                                                 *out++ = (short) ((int) ((LittleShort (in[srcsample  ]) * (256 - (samplefrac & 255)) + LittleShort (in[srcsample+2]) * (samplefrac & 255)) >> 8));
 167                                                 *out++ = (short) ((int) ((LittleShort (in[srcsample+1]) * (256 - (samplefrac & 255)) + LittleShort (in[srcsample+3]) * (samplefrac & 255)) >> 8));
 168                                         }
 169                                 }
 170                                 else
 171                                 {
 172                                         for (i=0 ; i<outcount ; i++)
 173                                         {
 174                                                 srcsample = samplefrac >> 8;
 175                                                 samplefrac += fracstep;
 176                                                 *out++ = (short) ((int) ((LittleShort (in[srcsample]  ) * (256 - (samplefrac & 255)) + LittleShort (in[srcsample+1]) * (samplefrac & 255)) >> 8));
 177                                         }
 178                                 }
 179                         }
 180                         else
 181                         {
 182                                 signed char *out = (void *)sc->data, *in = (void *)data;
 183                                 if (sc->stereo) // LordHavoc: stereo sound support
 184                                 {
 185                                         for (i=0 ; i<outcount ;)
 186                                         {
 187                                                 srcsample = (samplefrac >> 7) & ~1;
 188                                                 samplefrac += fracstep;
 189                                                 *out++ = (signed char) ((int) (((((unsigned char) in[srcsample  ] - 128) * (256 - (samplefrac & 255))) + (((unsigned char) in[srcsample+2] - 128) * (samplefrac & 255))) >> 8));
 190                                                 *out++ = (signed char) ((int) (((((unsigned char) in[srcsample+1] - 128) * (256 - (samplefrac & 255))) + (((unsigned char) in[srcsample+3] - 128) * (samplefrac & 255))) >> 8));
 191                                         }
 192                                 }
 193                                 else
 194                                 {
 195                                         for (i=0 ; i<outcount ; i++)
 196                                         {
 197                                                 srcsample = samplefrac >> 8;
 198                                                 samplefrac += fracstep;
 199                                                 *out++ = (signed char) ((int) (((((unsigned char) in[srcsample  ] - 128) * (256 - (samplefrac & 255))) + (((unsigned char) in[srcsample+1] - 128) * (samplefrac & 255))) >> 8));
 200                                         }
 201                                 }
 202                         }
 203                 }
 204         }
 205 }
 206
 207 //=============================================================================
 208
 209 /*
 210 ==============
 211 S_LoadSound
 212 ==============
 213 */
 214 sfxcache_t *S_LoadSound (sfx_t *s)
 215 {
 216     char        namebuffer[256];
 217         byte    *data;
 218         wavinfo_t       info;
 219         int             len;
 220         float   stepscale;
 221         sfxcache_t      *sc;
 222         byte    stackbuf[1*1024];               // avoid dirtying the cache heap
 223
 224 // see if still in memory
 225         sc = Cache_Check (&s->cache);
 226         if (sc)
 227                 return sc;
 228
 229 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
 230 // load it in
 231         strcpy(namebuffer, "sound/");
 232         strcat(namebuffer, s->name);
 233
 234 //      Con_Printf ("loading %s\n",namebuffer);
 235
 236         data = COM_LoadStackFile(namebuffer, stackbuf, sizeof(stackbuf), false);
 237
 238         if (!data)
 239         {
 240                 Con_Printf ("Couldn't load %s\n", namebuffer);
 241                 return NULL;
 242         }
 243
 244         info = GetWavinfo (s->name, data, com_filesize);
 245         // LordHavoc: stereo sounds are now allowed (intended for music)
 246         if (info.channels < 1 || info.channels > 2)
 247         {
 248                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 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         stepscale = (float)info.rate / shm->speed;
 260         len = info.samples / stepscale;
 261
 262         len = len * info.width * info.channels;
 263
 264         sc = Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name);
 265         if (!sc)
 266                 return NULL;
 267
 268         sc->length = info.samples;
 269         sc->loopstart = info.loopstart;
 270         sc->speed = info.rate;
 271         sc->width = info.width;
 272         sc->stereo = info.channels == 2;
 273
 274         ResampleSfx (s, sc->speed, data + info.dataofs);
 275
 276         return sc;
 277 }
 278
 279
 280
 281 /*
 282 ===============================================================================
 283
 284 WAV loading
 285
 286 ===============================================================================
 287 */
 288
 289
 290 byte    *data_p;
 291 byte    *iff_end;
 292 byte    *last_chunk;
 293 byte    *iff_data;
 294 int     iff_chunk_len;
 295
 296
 297 short GetLittleShort(void)
 298 {
 299         short val = 0;
 300         val = *data_p;
 301         val = val + (*(data_p+1)<<8);
 302         data_p += 2;
 303         return val;
 304 }
 305
 306 int GetLittleLong(void)
 307 {
 308         int val = 0;
 309         val = *data_p;
 310         val = val + (*(data_p+1)<<8);
 311         val = val + (*(data_p+2)<<16);
 312         val = val + (*(data_p+3)<<24);
 313         data_p += 4;
 314         return val;
 315 }
 316
 317 void FindNextChunk(char *name)
 318 {
 319         while (1)
 320         {
 321                 data_p=last_chunk;
 322
 323                 if (data_p >= iff_end)
 324                 {       // didn't find the chunk
 325                         data_p = NULL;
 326                         return;
 327                 }
 328
 329                 data_p += 4;
 330                 iff_chunk_len = GetLittleLong();
 331                 if (iff_chunk_len < 0)
 332                 {
 333                         data_p = NULL;
 334                         return;
 335                 }
 336 //              if (iff_chunk_len > 1024*1024)
 337 //                      Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
 338                 data_p -= 8;
 339                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 340                 if (!strncmp(data_p, name, 4))
 341                         return;
 342         }
 343 }
 344
 345 void FindChunk(char *name)
 346 {
 347         last_chunk = iff_data;
 348         FindNextChunk (name);
 349 }
 350
 351
 352 void DumpChunks(void)
 353 {
 354         char    str[5];
 355
 356         str[4] = 0;
 357         data_p=iff_data;
 358         do
 359         {
 360                 memcpy (str, data_p, 4);
 361                 data_p += 4;
 362                 iff_chunk_len = GetLittleLong();
 363                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 364                 data_p += (iff_chunk_len + 1) & ~1;
 365         } while (data_p < iff_end);
 366 }
 367
 368 /*
 369 ============
 370 GetWavinfo
 371 ============
 372 */
 373 wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
 374 {
 375         wavinfo_t       info;
 376         int     i;
 377         int     format;
 378         int             samples;
 379
 380         memset (&info, 0, sizeof(info));
 381
 382         if (!wav)
 383                 return info;
 384
 385         iff_data = wav;
 386         iff_end = wav + wavlength;
 387
 388 // find "RIFF" chunk
 389         FindChunk("RIFF");
 390         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 391         {
 392                 Con_Printf("Missing RIFF/WAVE chunks\n");
 393                 return info;
 394         }
 395
 396 // get "fmt " chunk
 397         iff_data = data_p + 12;
 398 // DumpChunks ();
 399
 400         FindChunk("fmt ");
 401         if (!data_p)
 402         {
 403                 Con_Printf("Missing fmt chunk\n");
 404                 return info;
 405         }
 406         data_p += 8;
 407         format = GetLittleShort();
 408         if (format != 1)
 409         {
 410                 Con_Printf("Microsoft PCM format only\n");
 411                 return info;
 412         }
 413
 414         info.channels = GetLittleShort();
 415         info.rate = GetLittleLong();
 416         data_p += 4+2;
 417         info.width = GetLittleShort() / 8;
 418
 419 // get cue chunk
 420         FindChunk("cue ");
 421         if (data_p)
 422         {
 423                 data_p += 32;
 424                 info.loopstart = GetLittleLong();
 425 //              Con_Printf("loopstart=%d\n", sfx->loopstart);
 426
 427         // if the next chunk is a LIST chunk, look for a cue length marker
 428                 FindNextChunk ("LIST");
 429                 if (data_p)
 430                 {
 431                         if (!strncmp (data_p + 28, "mark", 4))
 432                         {       // this is not a proper parse, but it works with cooledit...
 433                                 data_p += 24;
 434                                 i = GetLittleLong ();   // samples in loop
 435                                 info.samples = info.loopstart + i;
 436 //                              Con_Printf("looped length: %i\n", i);
 437                         }
 438                 }
 439         }
 440         else
 441                 info.loopstart = -1;
 442
 443 // find data chunk
 444         FindChunk("data");
 445         if (!data_p)
 446         {
 447                 Con_Printf("Missing data chunk\n");
 448                 return info;
 449         }
 450
 451         data_p += 4;
 452         samples = GetLittleLong () / info.width;
 453
 454         if (info.samples)
 455         {
 456                 if (samples < info.samples)
 457                         Host_Error ("Sound %s has a bad loop length", name);
 458         }
 459         else
 460                 info.samples = samples;
 461
 462         info.dataofs = data_p - wav;
 463
 464         return info;
 465 }
 466