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 int                     cache_full_cycle;
  25
  26 byte *S_Alloc (int size);
  27
  28 /*
  29 ================
  30 ResampleSfx
  31 ================
  32 */
  33 void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
  34 {
  35         int             outcount;
  36         int             srcsample;
  37         float   stepscale;
  38         int             i;
  39         int             sample, samplefrac, fracstep;
  40         sfxcache_t      *sc;
  41
  42         sc = Cache_Check (&sfx->cache);
  43         if (!sc)
  44                 return;
  45
  46         stepscale = (float)inrate / shm->speed; // this is usually 0.5, 1, or 2
  47
  48         outcount = sc->length / stepscale;
  49         sc->length = outcount;
  50         if (sc->loopstart != -1)
  51                 sc->loopstart = sc->loopstart / stepscale;
  52
  53         sc->speed = shm->speed;
  54         if (loadas8bit.value)
  55                 sc->width = 1;
  56         else
  57                 sc->width = inwidth;
  58 //      sc->stereo = 0;
  59
  60 // resample / decimate to the current source rate
  61
  62         if (stepscale == 1 && inwidth == 1 && sc->width == 1)
  63         {
  64 // fast special case
  65                 // LordHavoc: I do not serve the readability gods...
  66                 int *indata, *outdata;
  67                 int count4, count1;
  68                 count1 = outcount << sc->stereo;
  69                 count4 = count1 >> 2;
  70                 indata = (void *)data;
  71                 outdata = (void *)sc->data;
  72                 while (count4--)
  73                         *outdata++ = *indata++ ^ 0x80808080;
  74                 if (count1 & 2)
  75                         ((short*)outdata)[0] = ((short*)indata)[0] ^ 0x8080;
  76                 if (count1 & 1)
  77                         ((char*)outdata)[2] = ((char*)indata)[2] ^ 0x80;
  78                 /*
  79                 if (sc->stereo) // LordHavoc: stereo sound support
  80                 {
  81                         for (i=0 ; i<(outcount<<1) ; i++)
  82                                 ((signed char *)sc->data)[i] = (int)( (unsigned char)(data[i]) - 128);
  83                 }
  84                 else
  85                 {
  86                         for (i=0 ; i<outcount ; i++)
  87                                 ((signed char *)sc->data)[i] = (int)( (unsigned char)(data[i]) - 128);
  88                 }
  89                 */
  90         }
  91         else
  92         {
  93 // general case
  94                 Con_DPrintf("ResampleSfx: resampling sound %s\n", sfx->name);
  95                 samplefrac = 0;
  96                 fracstep = stepscale*256;
  97                 if (sc->stereo) // LordHavoc: stereo sound support
  98                 {
  99                         for (i=0 ; i<outcount ; i+=2)
 100                         {
 101                                 srcsample = samplefrac >> 8;
 102                                 samplefrac += fracstep;
 103                                 srcsample <<= 1;
 104                                 // left
 105                                 if (inwidth == 2)
 106                                         sample = LittleShort ( ((short *)data)[srcsample] );
 107                                 else
 108                                         sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8;
 109                                 if (sc->width == 2)
 110                                         ((short *)sc->data)[i] = sample;
 111                                 else
 112                                         ((signed char *)sc->data)[i] = sample >> 8;
 113                                 // right
 114                                 srcsample++;
 115                                 if (inwidth == 2)
 116                                         sample = LittleShort ( ((short *)data)[srcsample] );
 117                                 else
 118                                         sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8;
 119                                 if (sc->width == 2)
 120                                         ((short *)sc->data)[i+1] = sample;
 121                                 else
 122                                         ((signed char *)sc->data)[i+1] = sample >> 8;
 123                         }
 124                 }
 125                 else
 126                 {
 127                         for (i=0 ; i<outcount ; i++)
 128                         {
 129                                 srcsample = samplefrac >> 8;
 130                                 samplefrac += fracstep;
 131                                 if (inwidth == 2)
 132                                         sample = LittleShort ( ((short *)data)[srcsample] );
 133                                 else
 134                                         sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8;
 135                                 if (sc->width == 2)
 136                                         ((short *)sc->data)[i] = sample;
 137                                 else
 138                                         ((signed char *)sc->data)[i] = sample >> 8;
 139                         }
 140                 }
 141         }
 142 }
 143
 144 //=============================================================================
 145
 146 /*
 147 ==============
 148 S_LoadSound
 149 ==============
 150 */
 151 sfxcache_t *S_LoadSound (sfx_t *s)
 152 {
 153     char        namebuffer[256];
 154         byte    *data;
 155         wavinfo_t       info;
 156         int             len;
 157         float   stepscale;
 158         sfxcache_t      *sc;
 159         byte    stackbuf[1*1024];               // avoid dirtying the cache heap
 160
 161 // see if still in memory
 162         sc = Cache_Check (&s->cache);
 163         if (sc)
 164                 return sc;
 165
 166 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
 167 // load it in
 168         strcpy(namebuffer, "sound/");
 169         strcat(namebuffer, s->name);
 170
 171 //      Con_Printf ("loading %s\n",namebuffer);
 172
 173         data = COM_LoadStackFile(namebuffer, stackbuf, sizeof(stackbuf), false);
 174
 175         if (!data)
 176         {
 177                 Con_Printf ("Couldn't load %s\n", namebuffer);
 178                 return NULL;
 179         }
 180
 181         info = GetWavinfo (s->name, data, com_filesize);
 182         // LordHavoc: stereo sounds are now allowed (intended for music)
 183         if (info.channels < 1 || info.channels > 2)
 184         {
 185                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
 186                 return NULL;
 187         }
 188         /*
 189         if (info.channels != 1)
 190         {
 191                 Con_Printf ("%s is a stereo sample\n",s->name);
 192                 return NULL;
 193         }
 194         */
 195
 196         stepscale = (float)info.rate / shm->speed;
 197         len = info.samples / stepscale;
 198
 199         len = len * info.width * info.channels;
 200
 201         sc = Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name);
 202         if (!sc)
 203                 return NULL;
 204
 205         sc->length = info.samples;
 206         sc->loopstart = info.loopstart;
 207         sc->speed = info.rate;
 208         sc->width = info.width;
 209         sc->stereo = info.channels == 2;
 210
 211         ResampleSfx (s, sc->speed, sc->width, data + info.dataofs);
 212
 213         return sc;
 214 }
 215
 216
 217
 218 /*
 219 ===============================================================================
 220
 221 WAV loading
 222
 223 ===============================================================================
 224 */
 225
 226
 227 byte    *data_p;
 228 byte    *iff_end;
 229 byte    *last_chunk;
 230 byte    *iff_data;
 231 int     iff_chunk_len;
 232
 233
 234 short GetLittleShort(void)
 235 {
 236         short val = 0;
 237         val = *data_p;
 238         val = val + (*(data_p+1)<<8);
 239         data_p += 2;
 240         return val;
 241 }
 242
 243 int GetLittleLong(void)
 244 {
 245         int val = 0;
 246         val = *data_p;
 247         val = val + (*(data_p+1)<<8);
 248         val = val + (*(data_p+2)<<16);
 249         val = val + (*(data_p+3)<<24);
 250         data_p += 4;
 251         return val;
 252 }
 253
 254 void FindNextChunk(char *name)
 255 {
 256         while (1)
 257         {
 258                 data_p=last_chunk;
 259
 260                 if (data_p >= iff_end)
 261                 {       // didn't find the chunk
 262                         data_p = NULL;
 263                         return;
 264                 }
 265
 266                 data_p += 4;
 267                 iff_chunk_len = GetLittleLong();
 268                 if (iff_chunk_len < 0)
 269                 {
 270                         data_p = NULL;
 271                         return;
 272                 }
 273 //              if (iff_chunk_len > 1024*1024)
 274 //                      Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
 275                 data_p -= 8;
 276                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
 277                 if (!strncmp(data_p, name, 4))
 278                         return;
 279         }
 280 }
 281
 282 void FindChunk(char *name)
 283 {
 284         last_chunk = iff_data;
 285         FindNextChunk (name);
 286 }
 287
 288
 289 void DumpChunks(void)
 290 {
 291         char    str[5];
 292
 293         str[4] = 0;
 294         data_p=iff_data;
 295         do
 296         {
 297                 memcpy (str, data_p, 4);
 298                 data_p += 4;
 299                 iff_chunk_len = GetLittleLong();
 300                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
 301                 data_p += (iff_chunk_len + 1) & ~1;
 302         } while (data_p < iff_end);
 303 }
 304
 305 /*
 306 ============
 307 GetWavinfo
 308 ============
 309 */
 310 wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
 311 {
 312         wavinfo_t       info;
 313         int     i;
 314         int     format;
 315         int             samples;
 316
 317         memset (&info, 0, sizeof(info));
 318
 319         if (!wav)
 320                 return info;
 321
 322         iff_data = wav;
 323         iff_end = wav + wavlength;
 324
 325 // find "RIFF" chunk
 326         FindChunk("RIFF");
 327         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
 328         {
 329                 Con_Printf("Missing RIFF/WAVE chunks\n");
 330                 return info;
 331         }
 332
 333 // get "fmt " chunk
 334         iff_data = data_p + 12;
 335 // DumpChunks ();
 336
 337         FindChunk("fmt ");
 338         if (!data_p)
 339         {
 340                 Con_Printf("Missing fmt chunk\n");
 341                 return info;
 342         }
 343         data_p += 8;
 344         format = GetLittleShort();
 345         if (format != 1)
 346         {
 347                 Con_Printf("Microsoft PCM format only\n");
 348                 return info;
 349         }
 350
 351         info.channels = GetLittleShort();
 352         info.rate = GetLittleLong();
 353         data_p += 4+2;
 354         info.width = GetLittleShort() / 8;
 355
 356 // get cue chunk
 357         FindChunk("cue ");
 358         if (data_p)
 359         {
 360                 data_p += 32;
 361                 info.loopstart = GetLittleLong();
 362 //              Con_Printf("loopstart=%d\n", sfx->loopstart);
 363
 364         // if the next chunk is a LIST chunk, look for a cue length marker
 365                 FindNextChunk ("LIST");
 366                 if (data_p)
 367                 {
 368                         if (!strncmp (data_p + 28, "mark", 4))
 369                         {       // this is not a proper parse, but it works with cooledit...
 370                                 data_p += 24;
 371                                 i = GetLittleLong ();   // samples in loop
 372                                 info.samples = info.loopstart + i;
 373 //                              Con_Printf("looped length: %i\n", i);
 374                         }
 375                 }
 376         }
 377         else
 378                 info.loopstart = -1;
 379
 380 // find data chunk
 381         FindChunk("data");
 382         if (!data_p)
 383         {
 384                 Con_Printf("Missing data chunk\n");
 385                 return info;
 386         }
 387
 388         data_p += 4;
 389         samples = GetLittleLong () / info.width;
 390
 391         if (info.samples)
 392         {
 393                 if (samples < info.samples)
 394                         Host_Error ("Sound %s has a bad loop length", name);
 395         }
 396         else
 397                 info.samples = samples;
 398
 399         info.dataofs = data_p - wav;
 400
 401         return info;
 402 }
 403