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 #include "ogg.h"
  25
  26
  27 /*
  28 ================
  29 ResampleSfx
  30 ================
  31 */
  32 void ResampleSfx (sfxcache_t *sc, qbyte *data, char *name)
  33 {
  34         int i, outcount, srcsample, srclength, samplefrac, fracstep;
  35
  36         // this is usually 0.5 (128), 1 (256), or 2 (512)
  37         fracstep = ((double) sc->speed / (double) shm->speed) * 256.0;
  38
  39         srclength = sc->length << sc->stereo;
  40
  41         outcount = (double) sc->length * (double) shm->speed / (double) sc->speed;
  42         Con_DPrintf("ResampleSfx: resampling sound %s from %dhz to %dhz (%d samples to %d samples)\n", name, sc->speed, shm->speed, sc->length, outcount);
  43         sc->length = outcount;
  44         if (sc->loopstart != -1)
  45                 sc->loopstart = (double) sc->loopstart * (double) shm->speed / (double) sc->speed;
  46
  47         sc->speed = shm->speed;
  48
  49 // resample / decimate to the current source rate
  50
  51         if (fracstep == 256)
  52         {
  53                 // fast case for direct transfer
  54                 if (sc->width == 1) // 8bit
  55                         for (i = 0;i < srclength;i++)
  56                                 ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
  57                 else //if (sc->width == 2) // 16bit
  58                         for (i = 0;i < srclength;i++)
  59                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
  60         }
  61         else
  62         {
  63                 // general case
  64                 samplefrac = 0;
  65                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
  66                 {
  67                         srcsample = 0;
  68                         fracstep >>= 8;
  69                         if (sc->width == 2)
  70                         {
  71                                 short *out = (void *)sc->data, *in = (void *)data;
  72                                 if (sc->stereo) // LordHavoc: stereo sound support
  73                                 {
  74                                         fracstep <<= 1;
  75                                         for (i=0 ; i<outcount ; i++)
  76                                         {
  77                                                 *out++ = LittleShort (in[srcsample  ]);
  78                                                 *out++ = LittleShort (in[srcsample+1]);
  79                                                 srcsample += fracstep;
  80                                         }
  81                                 }
  82                                 else
  83                                 {
  84                                         for (i=0 ; i<outcount ; i++)
  85                                         {
  86                                                 *out++ = LittleShort (in[srcsample  ]);
  87                                                 srcsample += fracstep;
  88                                         }
  89                                 }
  90                         }
  91                         else
  92                         {
  93                                 signed char *out = (void *)sc->data;
  94                                 unsigned char *in = (void *)data;
  95                                 if (sc->stereo) // LordHavoc: stereo sound support
  96                                 {
  97                                         fracstep <<= 1;
  98                                         for (i=0 ; i<outcount ; i++)
  99                                         {
 100                                                 *out++ = in[srcsample  ] - 128;
 101                                                 *out++ = in[srcsample+1] - 128;
 102                                                 srcsample += fracstep;
 103                                         }
 104                                 }
 105                                 else
 106                                 {
 107                                         for (i=0 ; i<outcount ; i++)
 108                                         {
 109                                                 *out++ = in[srcsample  ] - 128;
 110                                                 srcsample += fracstep;
 111                                         }
 112                                 }
 113                         }
 114                 }
 115                 else
 116                 {
 117                         int sample;
 118                         int a, b;
 119                         if (sc->width == 2)
 120                         {
 121                                 short *out = (void *)sc->data, *in = (void *)data;
 122                                 if (sc->stereo) // LordHavoc: stereo sound support
 123                                 {
 124                                         for (i=0 ; i<outcount ; i++)
 125                                         {
 126                                                 srcsample = (samplefrac >> 8) << 1;
 127                                                 a = in[srcsample  ];
 128                                                 if (srcsample+2 >= srclength)
 129                                                         b = 0;
 130                                                 else
 131                                                         b = in[srcsample+2];
 132                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 133                                                 *out++ = (short) sample;
 134                                                 a = in[srcsample+1];
 135                                                 if (srcsample+2 >= srclength)
 136                                                         b = 0;
 137                                                 else
 138                                                         b = in[srcsample+3];
 139                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 140                                                 *out++ = (short) sample;
 141                                                 samplefrac += fracstep;
 142                                         }
 143                                 }
 144                                 else
 145                                 {
 146                                         for (i=0 ; i<outcount ; i++)
 147                                         {
 148                                                 srcsample = samplefrac >> 8;
 149                                                 a = in[srcsample  ];
 150                                                 if (srcsample+1 >= srclength)
 151                                                         b = 0;
 152                                                 else
 153                                                         b = in[srcsample+1];
 154                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 155                                                 *out++ = (short) sample;
 156                                                 samplefrac += fracstep;
 157                                         }
 158                                 }
 159                         }
 160                         else
 161                         {
 162                                 signed char *out = (void *)sc->data;
 163                                 unsigned char *in = (void *)data;
 164                                 if (sc->stereo) // LordHavoc: stereo sound support
 165                                 {
 166                                         for (i=0 ; i<outcount ; i++)
 167                                         {
 168                                                 srcsample = (samplefrac >> 8) << 1;
 169                                                 a = (int) in[srcsample  ] - 128;
 170                                                 if (srcsample+2 >= srclength)
 171                                                         b = 0;
 172                                                 else
 173                                                         b = (int) in[srcsample+2] - 128;
 174                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 175                                                 *out++ = (signed char) sample;
 176                                                 a = (int) in[srcsample+1] - 128;
 177                                                 if (srcsample+2 >= srclength)
 178                                                         b = 0;
 179                                                 else
 180                                                         b = (int) in[srcsample+3] - 128;
 181                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 182                                                 *out++ = (signed char) sample;
 183                                                 samplefrac += fracstep;
 184                                         }
 185                                 }
 186                                 else
 187                                 {
 188                                         for (i=0 ; i<outcount ; i++)
 189                                         {
 190                                                 srcsample = samplefrac >> 8;
 191                                                 a = (int) in[srcsample  ] - 128;
 192                                                 if (srcsample+1 >= srclength)
 193                                                         b = 0;
 194                                                 else
 195                                                         b = (int) in[srcsample+1] - 128;
 196                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
 197                                                 *out++ = (signed char) sample;
 198                                                 samplefrac += fracstep;
 199                                         }
 200                                 }
 201                         }
 202                 }
 203         }
 204
 205         // LordHavoc: use this for testing if it ever becomes useful again
 206         //COM_WriteFile (va("sound/%s.pcm", name), sc->data, (sc->length << sc->stereo) * sc->width);
 207 }
 208
 209 //=============================================================================
 210
 211 /*
 212 ==============
 213 S_LoadWavFile
 214 ==============
 215 */
 216 sfxcache_t *S_LoadWavFile (const char *filename, sfx_t *s)
 217 {
 218         qbyte *data;
 219         wavinfo_t info;
 220         int len;
 221         sfxcache_t *sc;
 222
 223         // Load the file
 224         data = FS_LoadFile(filename, false);
 225         if (!data)
 226                 return NULL;
 227
 228         // Don't try to load it if it's not a WAV file
 229         if (memcmp (data, "RIFF", 4) || memcmp (data + 8, "WAVE", 4))
 230                 return NULL;
 231
 232         info = GetWavinfo (s->name, data, fs_filesize);
 233         // Stereo sounds are allowed (intended for music)
 234         if (info.channels < 1 || info.channels > 2)
 235         {
 236                 Con_Printf("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 237                 Mem_Free(data);
 238                 return NULL;
 239         }
 240
 241         // calculate resampled length
 242         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
 243         len = len * info.width * info.channels;
 244
 245         Mem_FreePool(&s->mempool);
 246         s->mempool = Mem_AllocPool(s->name);
 247         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
 248         if (!sc)
 249         {
 250                 Con_Printf("failed to allocate memory for sound \"%s\"\n", s->name);
 251                 Mem_FreePool(&s->mempool);
 252                 Mem_Free(data);
 253                 return NULL;
 254         }
 255
 256         sc->length = info.samples;
 257         sc->loopstart = info.loopstart;
 258         sc->speed = info.rate;
 259         sc->width = info.width;
 260         sc->stereo = info.channels == 2;
 261
 262         ResampleSfx(sc, data + info.dataofs, s->name);
 263
 264         Mem_Free(data);
 265         return sc;
 266 }
 267
 268
 269 /*
 270 ==============
 271 S_LoadSound
 272 ==============
 273 */
 274 sfxcache_t *S_LoadSound (sfx_t *s, int complain)
 275 {
 276         char namebuffer[MAX_QPATH];
 277         size_t len;
 278         sfxcache_t *sc;
 279         qboolean modified_name = false;
 280
 281         // see if still in memory
 282         if (!shm || !shm->speed)
 283                 return NULL;
 284         if (s->sfxcache && (s->sfxcache->speed == shm->speed))
 285                 return s->sfxcache;
 286
 287         len = snprintf (namebuffer, sizeof (namebuffer), "sound/%s", s->name);
 288         if (len >= sizeof (namebuffer))
 289                 return NULL;
 290
 291         // Try to load it as a WAV file
 292         sc = S_LoadWavFile (namebuffer, s);
 293         if (sc != NULL)
 294                 return sc;
 295
 296         // Else, try to load it as an Ogg Vorbis file
 297         if (!strcasecmp (namebuffer + len - 4, ".wav"))
 298         {
 299                 strcpy (namebuffer + len - 3, "ogg");
 300                 modified_name = true;
 301         }
 302         sc = OGG_LoadVorbisFile (namebuffer, s);
 303         if (sc != NULL)
 304                 return sc;
 305
 306         // Can't load the sound!
 307         if (!complain)
 308                 s->flags |= SFXFLAG_SILENTLYMISSING;
 309         else
 310                 s->flags &= ~SFXFLAG_SILENTLYMISSING;
 311         if (complain)
 312         {
 313                 if (modified_name)
 314                         strcpy (namebuffer + len - 3, "wav");
 315                 Con_Printf ("Couldn't load %s\n", namebuffer);
 316         }
 317         return NULL;
 318 }
 319
 320 void S_UnloadSound(sfx_t *s)
 321 {
 322         if (s->sfxcache)
 323         {
 324                 s->sfxcache = NULL;
 325                 Mem_FreePool(&s->mempool);
 326         }
 327 }
 328
 329
 330 /*
 331 ===============================================================================
 332
 333 WAV loading
 334
 335 ===============================================================================
 336 */
 337
 338
 339 qbyte *data_p;
 340 qbyte *iff_end;
 341 qbyte *last_chunk;
 342 qbyte *iff_data;
 343 int iff_chunk_len;
 344
 345
 346 short GetLittleShort(void)
 347 {
 348         short val = 0;
 349         val = *data_p;
 350         val = val + (*(data_p+1)<<8);
 351         data_p += 2;
 352         return val;
 353 }
 354
 355 int GetLittleLong(void)
 356 {
 357         int val = 0;
 358         val = *data_p;
 359         val = val + (*(data_p+1)<<8);
 360         val = val + (*(data_p+2)<<16);
 361         val = val + (*(data_p+3)<<24);
 362         data_p += 4;
 363         return val;
 364 }
 365
 366 void FindNextChunk(char *name)
 367 {
 368         while (1)
 369         {
 370                 data_p=last_chunk;
 371
 372                 if (data_p >= iff_end)
 373                 {       // didn't find the chunk
 374                         data_p = NULL;
 375                         return;
 376                 }
 377
 378                 data_p += 4;
 379                 iff_chunk_len = GetLittleLong();
 380                 if (iff_chunk_len < 0)
 381                 {
 382                         data_p = NULL;
 383                         return;
 384                 }
 385                 data_p -= 8;
 386                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 387                 if (!strncmp(data_p, name, 4))
 388                         return;
 389         }
 390 }
 391
 392 void FindChunk(char *name)
 393 {
 394         last_chunk = iff_data;
 395         FindNextChunk (name);
 396 }
 397
 398
 399 void DumpChunks(void)
 400 {
 401         char str[5];
 402
 403         str[4] = 0;
 404         data_p=iff_data;
 405         do
 406         {
 407                 memcpy (str, data_p, 4);
 408                 data_p += 4;
 409                 iff_chunk_len = GetLittleLong();
 410                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 411                 data_p += (iff_chunk_len + 1) & ~1;
 412         } while (data_p < iff_end);
 413 }
 414
 415 /*
 416 ============
 417 GetWavinfo
 418 ============
 419 */
 420 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
 421 {
 422         wavinfo_t info;
 423         int i;
 424         int format;
 425         int samples;
 426
 427         memset (&info, 0, sizeof(info));
 428
 429         if (!wav)
 430                 return info;
 431
 432         iff_data = wav;
 433         iff_end = wav + wavlength;
 434
 435         // find "RIFF" chunk
 436         FindChunk("RIFF");
 437         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 438         {
 439                 Con_Printf("Missing RIFF/WAVE chunks\n");
 440                 return info;
 441         }
 442
 443         // get "fmt " chunk
 444         iff_data = data_p + 12;
 445         //DumpChunks ();
 446
 447         FindChunk("fmt ");
 448         if (!data_p)
 449         {
 450                 Con_Printf("Missing fmt chunk\n");
 451                 return info;
 452         }
 453         data_p += 8;
 454         format = GetLittleShort();
 455         if (format != 1)
 456         {
 457                 Con_Printf("Microsoft PCM format only\n");
 458                 return info;
 459         }
 460
 461         info.channels = GetLittleShort();
 462         info.rate = GetLittleLong();
 463         data_p += 4+2;
 464         info.width = GetLittleShort() / 8;
 465
 466         // get cue chunk
 467         FindChunk("cue ");
 468         if (data_p)
 469         {
 470                 data_p += 32;
 471                 info.loopstart = GetLittleLong();
 472
 473                 // if the next chunk is a LIST chunk, look for a cue length marker
 474                 FindNextChunk ("LIST");
 475                 if (data_p)
 476                 {
 477                         if (!strncmp (data_p + 28, "mark", 4))
 478                         {       // this is not a proper parse, but it works with cooledit...
 479                                 data_p += 24;
 480                                 i = GetLittleLong ();   // samples in loop
 481                                 info.samples = info.loopstart + i;
 482                         }
 483                 }
 484         }
 485         else
 486                 info.loopstart = -1;
 487
 488         // find data chunk
 489         FindChunk("data");
 490         if (!data_p)
 491         {
 492                 Con_Printf("Missing data chunk\n");
 493                 return info;
 494         }
 495
 496         data_p += 4;
 497         samples = GetLittleLong () / info.width / info.channels;
 498
 499         if (info.samples)
 500         {
 501                 if (samples < info.samples)
 502                         Host_Error ("Sound %s has a bad loop length", name);
 503         }
 504         else
 505                 info.samples = samples;
 506
 507         info.dataofs = data_p - wav;
 508
 509         return info;
 510 }
 511