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_LoadWavFile
 211 ==============
 212 */
 213 sfxcache_t *S_LoadWavFile (const char *filename, sfx_t *s)
 214 {
 215         qbyte *data;
 216         wavinfo_t info;
 217         int len;
 218         sfxcache_t *sc;
 219
 220         // Load the file
 221         data = FS_LoadFile(filename, false);
 222         if (!data)
 223                 return NULL;
 224
 225         info = GetWavinfo (s->name, data, fs_filesize);
 226         // Stereo sounds are allowed (intended for music)
 227         if (info.channels < 1 || info.channels > 2)
 228         {
 229                 Con_Printf("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 230                 Mem_Free(data);
 231                 return NULL;
 232         }
 233
 234         // calculate resampled length
 235         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
 236         len = len * info.width * info.channels;
 237
 238         // FIXME: add S_UnloadSounds or something?
 239         Mem_FreePool(&s->mempool);
 240         s->mempool = Mem_AllocPool(s->name);
 241         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
 242         if (!sc)
 243         {
 244                 Con_Printf("failed to allocate memory for sound \"%s\"\n", s->name);
 245                 Mem_FreePool(&s->mempool);
 246                 Mem_Free(data);
 247                 return NULL;
 248         }
 249
 250         sc->length = info.samples;
 251         sc->loopstart = info.loopstart;
 252         sc->speed = info.rate;
 253         sc->width = info.width;
 254         sc->stereo = info.channels == 2;
 255
 256         ResampleSfx(sc, data + info.dataofs, s->name);
 257
 258         Mem_Free(data);
 259         return sc;
 260 }
 261
 262
 263 /*
 264 ==============
 265 S_LoadSound
 266 ==============
 267 */
 268 sfxcache_t *S_LoadSound (sfx_t *s, int complain)
 269 {
 270         char namebuffer[MAX_QPATH];
 271         size_t len;
 272         sfxcache_t *sc;
 273
 274         // see if still in memory
 275         if (!shm || !shm->speed)
 276                 return NULL;
 277         if (s->sfxcache && (s->sfxcache->speed == shm->speed))
 278                 return s->sfxcache;
 279
 280         len = snprintf (namebuffer, sizeof (namebuffer), "sound/%s", s->name);
 281         if (len >= sizeof (namebuffer))
 282                 return NULL;
 283
 284         // Try to load it as a WAV file
 285         sc = S_LoadWavFile (namebuffer, s);
 286
 287         // TODO: insert Ogg Vorbis support here
 288
 289         // Can't load the sound!
 290         if (sc == NULL)
 291         {
 292                 s->silentlymissing = !complain;
 293                 if (complain)
 294                         Con_Printf ("Couldn't load %s\n", namebuffer);
 295                 return NULL;
 296         }
 297
 298         return sc;
 299 }
 300
 301 void S_UnloadSound(sfx_t *s)
 302 {
 303         if (s->sfxcache)
 304         {
 305                 s->sfxcache = NULL;
 306                 Mem_FreePool(&s->mempool);
 307         }
 308 }
 309
 310
 311 /*
 312 ===============================================================================
 313
 314 WAV loading
 315
 316 ===============================================================================
 317 */
 318
 319
 320 qbyte *data_p;
 321 qbyte *iff_end;
 322 qbyte *last_chunk;
 323 qbyte *iff_data;
 324 int iff_chunk_len;
 325
 326
 327 short GetLittleShort(void)
 328 {
 329         short val = 0;
 330         val = *data_p;
 331         val = val + (*(data_p+1)<<8);
 332         data_p += 2;
 333         return val;
 334 }
 335
 336 int GetLittleLong(void)
 337 {
 338         int val = 0;
 339         val = *data_p;
 340         val = val + (*(data_p+1)<<8);
 341         val = val + (*(data_p+2)<<16);
 342         val = val + (*(data_p+3)<<24);
 343         data_p += 4;
 344         return val;
 345 }
 346
 347 void FindNextChunk(char *name)
 348 {
 349         while (1)
 350         {
 351                 data_p=last_chunk;
 352
 353                 if (data_p >= iff_end)
 354                 {       // didn't find the chunk
 355                         data_p = NULL;
 356                         return;
 357                 }
 358
 359                 data_p += 4;
 360                 iff_chunk_len = GetLittleLong();
 361                 if (iff_chunk_len < 0)
 362                 {
 363                         data_p = NULL;
 364                         return;
 365                 }
 366                 data_p -= 8;
 367                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 368                 if (!strncmp(data_p, name, 4))
 369                         return;
 370         }
 371 }
 372
 373 void FindChunk(char *name)
 374 {
 375         last_chunk = iff_data;
 376         FindNextChunk (name);
 377 }
 378
 379
 380 void DumpChunks(void)
 381 {
 382         char str[5];
 383
 384         str[4] = 0;
 385         data_p=iff_data;
 386         do
 387         {
 388                 memcpy (str, data_p, 4);
 389                 data_p += 4;
 390                 iff_chunk_len = GetLittleLong();
 391                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 392                 data_p += (iff_chunk_len + 1) & ~1;
 393         } while (data_p < iff_end);
 394 }
 395
 396 /*
 397 ============
 398 GetWavinfo
 399 ============
 400 */
 401 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
 402 {
 403         wavinfo_t info;
 404         int i;
 405         int format;
 406         int samples;
 407
 408         memset (&info, 0, sizeof(info));
 409
 410         if (!wav)
 411                 return info;
 412
 413         iff_data = wav;
 414         iff_end = wav + wavlength;
 415
 416         // find "RIFF" chunk
 417         FindChunk("RIFF");
 418         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 419         {
 420                 Con_Printf("Missing RIFF/WAVE chunks\n");
 421                 return info;
 422         }
 423
 424         // get "fmt " chunk
 425         iff_data = data_p + 12;
 426         //DumpChunks ();
 427
 428         FindChunk("fmt ");
 429         if (!data_p)
 430         {
 431                 Con_Printf("Missing fmt chunk\n");
 432                 return info;
 433         }
 434         data_p += 8;
 435         format = GetLittleShort();
 436         if (format != 1)
 437         {
 438                 Con_Printf("Microsoft PCM format only\n");
 439                 return info;
 440         }
 441
 442         info.channels = GetLittleShort();
 443         info.rate = GetLittleLong();
 444         data_p += 4+2;
 445         info.width = GetLittleShort() / 8;
 446
 447         // get cue chunk
 448         FindChunk("cue ");
 449         if (data_p)
 450         {
 451                 data_p += 32;
 452                 info.loopstart = GetLittleLong();
 453
 454                 // if the next chunk is a LIST chunk, look for a cue length marker
 455                 FindNextChunk ("LIST");
 456                 if (data_p)
 457                 {
 458                         if (!strncmp (data_p + 28, "mark", 4))
 459                         {       // this is not a proper parse, but it works with cooledit...
 460                                 data_p += 24;
 461                                 i = GetLittleLong ();   // samples in loop
 462                                 info.samples = info.loopstart + i;
 463                         }
 464                 }
 465         }
 466         else
 467                 info.loopstart = -1;
 468
 469         // find data chunk
 470         FindChunk("data");
 471         if (!data_p)
 472         {
 473                 Con_Printf("Missing data chunk\n");
 474                 return info;
 475         }
 476
 477         data_p += 4;
 478         samples = GetLittleLong () / info.width / info.channels;
 479
 480         if (info.samples)
 481         {
 482                 if (samples < info.samples)
 483                         Host_Error ("Sound %s has a bad loop length", name);
 484         }
 485         else
 486                 info.samples = samples;
 487
 488         info.dataofs = data_p - wav;
 489
 490         return info;
 491 }
 492