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                         srcsample = 0;
 109                         fracstep >>= 8;
 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                         int sample;
 158                         if (sc->width == 2)
 159                         {
 160                                 short *out = (void *)sc->data, *in = (void *)data;
 161                                 if (sc->stereo) // LordHavoc: stereo sound support
 162                                 {
 163                                         for (i=0 ; i<outcount ;)
 164                                         {
 165                                                 srcsample = (samplefrac >> 7) & ~1;
 166                                                 samplefrac += fracstep;
 167                                                 sample = (LittleShort (in[srcsample  ]) * (256 - (samplefrac & 255)) + LittleShort (in[srcsample+2]) * (samplefrac & 255)) >> 8;
 168                                                 *out++ = (short) sample;
 169                                                 sample = (LittleShort (in[srcsample+1]) * (256 - (samplefrac & 255)) + LittleShort (in[srcsample+3]) * (samplefrac & 255)) >> 8;
 170                                                 *out++ = (short) sample;
 171                                         }
 172                                 }
 173                                 else
 174                                 {
 175                                         for (i=0 ; i<outcount ; i++)
 176                                         {
 177                                                 srcsample = samplefrac >> 8;
 178                                                 samplefrac += fracstep;
 179                                                 sample = (LittleShort (in[srcsample  ]) * (256 - (samplefrac & 255)) + LittleShort (in[srcsample+1]) * (samplefrac & 255)) >> 8;
 180                                                 *out++ = (short) sample;
 181                                         }
 182                                 }
 183                         }
 184                         else
 185                         {
 186                                 signed char *out = (void *)sc->data, *in = (void *)data;
 187                                 if (sc->stereo) // LordHavoc: stereo sound support
 188                                 {
 189                                         for (i=0 ; i<outcount ;)
 190                                         {
 191                                                 srcsample = (samplefrac >> 7) & ~1;
 192                                                 samplefrac += fracstep;
 193                                                 sample = ((((unsigned char) in[srcsample  ] - 128) * (256 - (samplefrac & 255))) + (((unsigned char) in[srcsample+2] - 128) * (samplefrac & 255))) >> 8;
 194                                                 *out++ = (signed char) sample;
 195                                                 sample = ((((unsigned char) in[srcsample+1] - 128) * (256 - (samplefrac & 255))) + (((unsigned char) in[srcsample+3] - 128) * (samplefrac & 255))) >> 8;
 196                                                 *out++ = (signed char) sample;
 197                                         }
 198                                 }
 199                                 else
 200                                 {
 201                                         for (i=0 ; i<outcount ; i++)
 202                                         {
 203                                                 srcsample = samplefrac >> 8;
 204                                                 samplefrac += fracstep;
 205                                                 sample = ((((unsigned char) in[srcsample  ] - 128) * (256 - (samplefrac & 255))) + (((unsigned char) in[srcsample+1] - 128) * (samplefrac & 255))) >> 8;
 206                                                 *out++ = (signed char) sample;
 207                                         }
 208                                 }
 209                         }
 210                 }
 211         }
 212 }
 213
 214 //=============================================================================
 215
 216 /*
 217 ==============
 218 S_LoadSound
 219 ==============
 220 */
 221 sfxcache_t *S_LoadSound (sfx_t *s)
 222 {
 223     char        namebuffer[256];
 224         byte    *data;
 225         wavinfo_t       info;
 226         int             len;
 227         float   stepscale;
 228         sfxcache_t      *sc;
 229
 230 // see if still in memory
 231         sc = Cache_Check (&s->cache);
 232         if (sc)
 233                 return sc;
 234
 235 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
 236 // load it in
 237         strcpy(namebuffer, "sound/");
 238         strcat(namebuffer, s->name);
 239
 240 //      Con_Printf ("loading %s\n",namebuffer);
 241
 242         data = COM_LoadMallocFile(namebuffer, false);
 243
 244         if (!data)
 245         {
 246                 Con_Printf ("Couldn't load %s\n", namebuffer);
 247                 return NULL;
 248         }
 249
 250         info = GetWavinfo (s->name, data, com_filesize);
 251         // LordHavoc: stereo sounds are now allowed (intended for music)
 252         if (info.channels < 1 || info.channels > 2)
 253         {
 254                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 255                 qfree(data);
 256                 return NULL;
 257         }
 258         /*
 259         if (info.channels != 1)
 260         {
 261                 Con_Printf ("%s is a stereo sample\n",s->name);
 262                 return NULL;
 263         }
 264         */
 265
 266         stepscale = (float)info.rate / shm->speed;
 267         len = info.samples / stepscale;
 268
 269         len = len * info.width * info.channels;
 270
 271         sc = Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name);
 272         if (!sc)
 273         {
 274                 qfree(data);
 275                 return NULL;
 276         }
 277
 278         sc->length = info.samples;
 279         sc->loopstart = info.loopstart;
 280         sc->speed = info.rate;
 281         sc->width = info.width;
 282         sc->stereo = info.channels == 2;
 283
 284         ResampleSfx (s, sc->speed, data + info.dataofs);
 285
 286         qfree(data);
 287         return sc;
 288 }
 289
 290
 291
 292 /*
 293 ===============================================================================
 294
 295 WAV loading
 296
 297 ===============================================================================
 298 */
 299
 300
 301 byte    *data_p;
 302 byte    *iff_end;
 303 byte    *last_chunk;
 304 byte    *iff_data;
 305 int     iff_chunk_len;
 306
 307
 308 short GetLittleShort(void)
 309 {
 310         short val = 0;
 311         val = *data_p;
 312         val = val + (*(data_p+1)<<8);
 313         data_p += 2;
 314         return val;
 315 }
 316
 317 int GetLittleLong(void)
 318 {
 319         int val = 0;
 320         val = *data_p;
 321         val = val + (*(data_p+1)<<8);
 322         val = val + (*(data_p+2)<<16);
 323         val = val + (*(data_p+3)<<24);
 324         data_p += 4;
 325         return val;
 326 }
 327
 328 void FindNextChunk(char *name)
 329 {
 330         while (1)
 331         {
 332                 data_p=last_chunk;
 333
 334                 if (data_p >= iff_end)
 335                 {       // didn't find the chunk
 336                         data_p = NULL;
 337                         return;
 338                 }
 339
 340                 data_p += 4;
 341                 iff_chunk_len = GetLittleLong();
 342                 if (iff_chunk_len < 0)
 343                 {
 344                         data_p = NULL;
 345                         return;
 346                 }
 347 //              if (iff_chunk_len > 1024*1024)
 348 //                      Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
 349                 data_p -= 8;
 350                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 351                 if (!strncmp(data_p, name, 4))
 352                         return;
 353         }
 354 }
 355
 356 void FindChunk(char *name)
 357 {
 358         last_chunk = iff_data;
 359         FindNextChunk (name);
 360 }
 361
 362
 363 void DumpChunks(void)
 364 {
 365         char    str[5];
 366
 367         str[4] = 0;
 368         data_p=iff_data;
 369         do
 370         {
 371                 memcpy (str, data_p, 4);
 372                 data_p += 4;
 373                 iff_chunk_len = GetLittleLong();
 374                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 375                 data_p += (iff_chunk_len + 1) & ~1;
 376         } while (data_p < iff_end);
 377 }
 378
 379 /*
 380 ============
 381 GetWavinfo
 382 ============
 383 */
 384 wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
 385 {
 386         wavinfo_t       info;
 387         int     i;
 388         int     format;
 389         int             samples;
 390
 391         memset (&info, 0, sizeof(info));
 392
 393         if (!wav)
 394                 return info;
 395
 396         iff_data = wav;
 397         iff_end = wav + wavlength;
 398
 399 // find "RIFF" chunk
 400         FindChunk("RIFF");
 401         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 402         {
 403                 Con_Printf("Missing RIFF/WAVE chunks\n");
 404                 return info;
 405         }
 406
 407 // get "fmt " chunk
 408         iff_data = data_p + 12;
 409 // DumpChunks ();
 410
 411         FindChunk("fmt ");
 412         if (!data_p)
 413         {
 414                 Con_Printf("Missing fmt chunk\n");
 415                 return info;
 416         }
 417         data_p += 8;
 418         format = GetLittleShort();
 419         if (format != 1)
 420         {
 421                 Con_Printf("Microsoft PCM format only\n");
 422                 return info;
 423         }
 424
 425         info.channels = GetLittleShort();
 426         info.rate = GetLittleLong();
 427         data_p += 4+2;
 428         info.width = GetLittleShort() / 8;
 429
 430 // get cue chunk
 431         FindChunk("cue ");
 432         if (data_p)
 433         {
 434                 data_p += 32;
 435                 info.loopstart = GetLittleLong();
 436 //              Con_Printf("loopstart=%d\n", sfx->loopstart);
 437
 438         // if the next chunk is a LIST chunk, look for a cue length marker
 439                 FindNextChunk ("LIST");
 440                 if (data_p)
 441                 {
 442                         if (!strncmp (data_p + 28, "mark", 4))
 443                         {       // this is not a proper parse, but it works with cooledit...
 444                                 data_p += 24;
 445                                 i = GetLittleLong ();   // samples in loop
 446                                 info.samples = info.loopstart + i;
 447 //                              Con_Printf("looped length: %i\n", i);
 448                         }
 449                 }
 450         }
 451         else
 452                 info.loopstart = -1;
 453
 454 // find data chunk
 455         FindChunk("data");
 456         if (!data_p)
 457         {
 458                 Con_Printf("Missing data chunk\n");
 459                 return info;
 460         }
 461
 462         data_p += 4;
 463         samples = GetLittleLong () / info.width;
 464
 465         if (info.samples)
 466         {
 467                 if (samples < info.samples)
 468                         Host_Error ("Sound %s has a bad loop length", name);
 469         }
 470         else
 471                 info.samples = samples;
 472
 473         info.dataofs = data_p - wav;
 474
 475         return info;
 476 }
 477