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         sc->length = outcount;
  40         if (sc->loopstart != -1)
  41                 sc->loopstart = (double) sc->loopstart * (double) shm->speed / (double) sc->speed;
  42
  43         sc->speed = shm->speed;
  44
  45 // resample / decimate to the current source rate
  46
  47         if (fracstep == 256)
  48         {
  49                 // fast case for direct transfer
  50                 if (sc->width == 1) // 8bit
  51                         for (i = 0;i < srclength;i++)
  52                                 ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
  53                 else //if (sc->width == 2) // 16bit
  54                         for (i = 0;i < srclength;i++)
  55                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  56         }
  57         else
  58         {
  59                 // general case
  60                 Con_DPrintf("ResampleSfx: resampling sound %s\n", name);
  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[256];
 216         qbyte *data;
 217         wavinfo_t info;
 218         int len;
 219         sfxcache_t *sc;
 220
 221         // see if still in memory
 222         if (s->sfxcache)
 223                 return s->sfxcache;
 224
 225         // load it in
 226         strcpy(namebuffer, "sound/");
 227         strcat(namebuffer, s->name);
 228
 229         data = FS_LoadFile(namebuffer, false);
 230
 231         if (!data)
 232         {
 233                 s->silentlymissing = !complain;
 234                 if (complain)
 235                         Con_DPrintf ("Couldn't load %s\n", namebuffer);
 236                 return NULL;
 237         }
 238
 239         info = GetWavinfo (s->name, data, fs_filesize);
 240         // LordHavoc: stereo sounds are now allowed (intended for music)
 241         if (info.channels < 1 || info.channels > 2)
 242         {
 243                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 244                 Mem_Free(data);
 245                 return NULL;
 246         }
 247
 248         // calculate resampled length
 249         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
 250         len = len * info.width * info.channels;
 251
 252         // FIXME: add S_UnloadSounds or something?
 253         Mem_FreePool(&s->mempool);
 254         s->mempool = Mem_AllocPool(s->name);
 255         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
 256         if (!sc)
 257         {
 258                 Mem_FreePool(&s->mempool);
 259                 Mem_Free(data);
 260                 return NULL;
 261         }
 262
 263         sc->length = info.samples;
 264         sc->loopstart = info.loopstart;
 265         sc->speed = info.rate;
 266         sc->width = info.width;
 267         sc->stereo = info.channels == 2;
 268
 269         ResampleSfx (sc, data + info.dataofs, s->name);
 270
 271         Mem_Free(data);
 272         return sc;
 273 }
 274
 275
 276
 277 /*
 278 ===============================================================================
 279
 280 WAV loading
 281
 282 ===============================================================================
 283 */
 284
 285
 286 qbyte *data_p;
 287 qbyte *iff_end;
 288 qbyte *last_chunk;
 289 qbyte *iff_data;
 290 int iff_chunk_len;
 291
 292
 293 short GetLittleShort(void)
 294 {
 295         short val = 0;
 296         val = *data_p;
 297         val = val + (*(data_p+1)<<8);
 298         data_p += 2;
 299         return val;
 300 }
 301
 302 int GetLittleLong(void)
 303 {
 304         int val = 0;
 305         val = *data_p;
 306         val = val + (*(data_p+1)<<8);
 307         val = val + (*(data_p+2)<<16);
 308         val = val + (*(data_p+3)<<24);
 309         data_p += 4;
 310         return val;
 311 }
 312
 313 void FindNextChunk(char *name)
 314 {
 315         while (1)
 316         {
 317                 data_p=last_chunk;
 318
 319                 if (data_p >= iff_end)
 320                 {       // didn't find the chunk
 321                         data_p = NULL;
 322                         return;
 323                 }
 324
 325                 data_p += 4;
 326                 iff_chunk_len = GetLittleLong();
 327                 if (iff_chunk_len < 0)
 328                 {
 329                         data_p = NULL;
 330                         return;
 331                 }
 332                 data_p -= 8;
 333                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 334                 if (!strncmp(data_p, name, 4))
 335                         return;
 336         }
 337 }
 338
 339 void FindChunk(char *name)
 340 {
 341         last_chunk = iff_data;
 342         FindNextChunk (name);
 343 }
 344
 345
 346 void DumpChunks(void)
 347 {
 348         char str[5];
 349
 350         str[4] = 0;
 351         data_p=iff_data;
 352         do
 353         {
 354                 memcpy (str, data_p, 4);
 355                 data_p += 4;
 356                 iff_chunk_len = GetLittleLong();
 357                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 358                 data_p += (iff_chunk_len + 1) & ~1;
 359         } while (data_p < iff_end);
 360 }
 361
 362 /*
 363 ============
 364 GetWavinfo
 365 ============
 366 */
 367 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
 368 {
 369         wavinfo_t info;
 370         int i;
 371         int format;
 372         int samples;
 373
 374         memset (&info, 0, sizeof(info));
 375
 376         if (!wav)
 377                 return info;
 378
 379         iff_data = wav;
 380         iff_end = wav + wavlength;
 381
 382         // find "RIFF" chunk
 383         FindChunk("RIFF");
 384         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 385         {
 386                 Con_Printf("Missing RIFF/WAVE chunks\n");
 387                 return info;
 388         }
 389
 390         // get "fmt " chunk
 391         iff_data = data_p + 12;
 392         //DumpChunks ();
 393
 394         FindChunk("fmt ");
 395         if (!data_p)
 396         {
 397                 Con_Printf("Missing fmt chunk\n");
 398                 return info;
 399         }
 400         data_p += 8;
 401         format = GetLittleShort();
 402         if (format != 1)
 403         {
 404                 Con_Printf("Microsoft PCM format only\n");
 405                 return info;
 406         }
 407
 408         info.channels = GetLittleShort();
 409         info.rate = GetLittleLong();
 410         data_p += 4+2;
 411         info.width = GetLittleShort() / 8;
 412
 413         // get cue chunk
 414         FindChunk("cue ");
 415         if (data_p)
 416         {
 417                 data_p += 32;
 418                 info.loopstart = GetLittleLong();
 419
 420                 // if the next chunk is a LIST chunk, look for a cue length marker
 421                 FindNextChunk ("LIST");
 422                 if (data_p)
 423                 {
 424                         if (!strncmp (data_p + 28, "mark", 4))
 425                         {       // this is not a proper parse, but it works with cooledit...
 426                                 data_p += 24;
 427                                 i = GetLittleLong ();   // samples in loop
 428                                 info.samples = info.loopstart + i;
 429                         }
 430                 }
 431         }
 432         else
 433                 info.loopstart = -1;
 434
 435         // find data chunk
 436         FindChunk("data");
 437         if (!data_p)
 438         {
 439                 Con_Printf("Missing data chunk\n");
 440                 return info;
 441         }
 442
 443         data_p += 4;
 444         samples = GetLittleLong () / info.width / info.channels;
 445
 446         if (info.samples)
 447         {
 448                 if (samples < info.samples)
 449                         Host_Error ("Sound %s has a bad loop length", name);
 450         }
 451         else
 452                 info.samples = samples;
 453
 454         info.dataofs = data_p - wav;
 455
 456         return info;
 457 }
 458