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