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         info = GetWavinfo (s->name, data, fs_filesize);
 229         // Stereo sounds are allowed (intended for music)
 230         if (info.channels < 1 || info.channels > 2)
 231         {
 232                 Con_Printf("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 233                 Mem_Free(data);
 234                 return NULL;
 235         }
 236
 237         // calculate resampled length
 238         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
 239         len = len * info.width * info.channels;
 240
 241         // FIXME: add S_UnloadSounds or something?
 242         Mem_FreePool(&s->mempool);
 243         s->mempool = Mem_AllocPool(s->name);
 244         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
 245         if (!sc)
 246         {
 247                 Con_Printf("failed to allocate memory for sound \"%s\"\n", s->name);
 248                 Mem_FreePool(&s->mempool);
 249                 Mem_Free(data);
 250                 return NULL;
 251         }
 252
 253         sc->length = info.samples;
 254         sc->loopstart = info.loopstart;
 255         sc->speed = info.rate;
 256         sc->width = info.width;
 257         sc->stereo = info.channels == 2;
 258
 259         ResampleSfx(sc, data + info.dataofs, s->name);
 260
 261         Mem_Free(data);
 262         return sc;
 263 }
 264
 265
 266 /*
 267 ==============
 268 S_LoadSound
 269 ==============
 270 */
 271 sfxcache_t *S_LoadSound (sfx_t *s, int complain)
 272 {
 273         char namebuffer[MAX_QPATH];
 274         size_t len;
 275         sfxcache_t *sc;
 276         qboolean modified_name = false;
 277
 278         // see if still in memory
 279         if (!shm || !shm->speed)
 280                 return NULL;
 281         if (s->sfxcache && (s->sfxcache->speed == shm->speed))
 282                 return s->sfxcache;
 283
 284         s->silentlymissing = !complain;
 285
 286         len = snprintf (namebuffer, sizeof (namebuffer), "sound/%s", s->name);
 287         if (len >= sizeof (namebuffer))
 288                 return NULL;
 289
 290         // Try to load it as a WAV file
 291         sc = S_LoadWavFile (namebuffer, s);
 292         if (sc != NULL)
 293                 return sc;
 294
 295         // Else, try to load it as an Ogg Vorbis file
 296         if (!strcasecmp (namebuffer + len - 4, ".wav"))
 297         {
 298                 strcpy (namebuffer + len - 3, "ogg");
 299                 modified_name = true;
 300         }
 301         sc = OGG_LoadVorbisFile (namebuffer, s);
 302         if (sc != NULL)
 303                 return sc;
 304
 305         // Can't load the sound!
 306         if (complain)
 307         {
 308                 if (modified_name)
 309                         strcpy (namebuffer + len - 3, "wav");
 310                 Con_Printf ("Couldn't load %s\n", namebuffer);
 311         }
 312         return NULL;
 313 }
 314
 315 void S_UnloadSound(sfx_t *s)
 316 {
 317         if (s->sfxcache)
 318         {
 319                 s->sfxcache = NULL;
 320                 Mem_FreePool(&s->mempool);
 321         }
 322 }
 323
 324
 325 /*
 326 ===============================================================================
 327
 328 WAV loading
 329
 330 ===============================================================================
 331 */
 332
 333
 334 qbyte *data_p;
 335 qbyte *iff_end;
 336 qbyte *last_chunk;
 337 qbyte *iff_data;
 338 int iff_chunk_len;
 339
 340
 341 short GetLittleShort(void)
 342 {
 343         short val = 0;
 344         val = *data_p;
 345         val = val + (*(data_p+1)<<8);
 346         data_p += 2;
 347         return val;
 348 }
 349
 350 int GetLittleLong(void)
 351 {
 352         int val = 0;
 353         val = *data_p;
 354         val = val + (*(data_p+1)<<8);
 355         val = val + (*(data_p+2)<<16);
 356         val = val + (*(data_p+3)<<24);
 357         data_p += 4;
 358         return val;
 359 }
 360
 361 void FindNextChunk(char *name)
 362 {
 363         while (1)
 364         {
 365                 data_p=last_chunk;
 366
 367                 if (data_p >= iff_end)
 368                 {       // didn't find the chunk
 369                         data_p = NULL;
 370                         return;
 371                 }
 372
 373                 data_p += 4;
 374                 iff_chunk_len = GetLittleLong();
 375                 if (iff_chunk_len < 0)
 376                 {
 377                         data_p = NULL;
 378                         return;
 379                 }
 380                 data_p -= 8;
 381                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 382                 if (!strncmp(data_p, name, 4))
 383                         return;
 384         }
 385 }
 386
 387 void FindChunk(char *name)
 388 {
 389         last_chunk = iff_data;
 390         FindNextChunk (name);
 391 }
 392
 393
 394 void DumpChunks(void)
 395 {
 396         char str[5];
 397
 398         str[4] = 0;
 399         data_p=iff_data;
 400         do
 401         {
 402                 memcpy (str, data_p, 4);
 403                 data_p += 4;
 404                 iff_chunk_len = GetLittleLong();
 405                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 406                 data_p += (iff_chunk_len + 1) & ~1;
 407         } while (data_p < iff_end);
 408 }
 409
 410 /*
 411 ============
 412 GetWavinfo
 413 ============
 414 */
 415 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
 416 {
 417         wavinfo_t info;
 418         int i;
 419         int format;
 420         int samples;
 421
 422         memset (&info, 0, sizeof(info));
 423
 424         if (!wav)
 425                 return info;
 426
 427         iff_data = wav;
 428         iff_end = wav + wavlength;
 429
 430         // find "RIFF" chunk
 431         FindChunk("RIFF");
 432         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 433         {
 434                 Con_Printf("Missing RIFF/WAVE chunks\n");
 435                 return info;
 436         }
 437
 438         // get "fmt " chunk
 439         iff_data = data_p + 12;
 440         //DumpChunks ();
 441
 442         FindChunk("fmt ");
 443         if (!data_p)
 444         {
 445                 Con_Printf("Missing fmt chunk\n");
 446                 return info;
 447         }
 448         data_p += 8;
 449         format = GetLittleShort();
 450         if (format != 1)
 451         {
 452                 Con_Printf("Microsoft PCM format only\n");
 453                 return info;
 454         }
 455
 456         info.channels = GetLittleShort();
 457         info.rate = GetLittleLong();
 458         data_p += 4+2;
 459         info.width = GetLittleShort() / 8;
 460
 461         // get cue chunk
 462         FindChunk("cue ");
 463         if (data_p)
 464         {
 465                 data_p += 32;
 466                 info.loopstart = GetLittleLong();
 467
 468                 // if the next chunk is a LIST chunk, look for a cue length marker
 469                 FindNextChunk ("LIST");
 470                 if (data_p)
 471                 {
 472                         if (!strncmp (data_p + 28, "mark", 4))
 473                         {       // this is not a proper parse, but it works with cooledit...
 474                                 data_p += 24;
 475                                 i = GetLittleLong ();   // samples in loop
 476                                 info.samples = info.loopstart + i;
 477                         }
 478                 }
 479         }
 480         else
 481                 info.loopstart = -1;
 482
 483         // find data chunk
 484         FindChunk("data");
 485         if (!data_p)
 486         {
 487                 Con_Printf("Missing data chunk\n");
 488                 return info;
 489         }
 490
 491         data_p += 4;
 492         samples = GetLittleLong () / info.width / info.channels;
 493
 494         if (info.samples)
 495         {
 496                 if (samples < info.samples)
 497                         Host_Error ("Sound %s has a bad loop length", name);
 498         }
 499         else
 500                 info.samples = samples;
 501
 502         info.dataofs = data_p - wav;
 503
 504         return info;
 505 }
 506