snd_mix.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_mix.c -- portable code to mix sounds for snd_dma.c
  21
  22 #include "quakedef.h"
  23
  24 #ifdef _WIN32
  25 #include "winquake.h"
  26 #endif
  27
  28 // LordHavoc: was 512, expanded to 2048
  29 #define PAINTBUFFER_SIZE 2048
  30 portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
  31 int snd_scaletable[32][256];
  32
  33 /*
  34 // LordHavoc: disabled this because it desyncs with the video too easily
  35 extern cvar_t cl_avidemo;
  36 static FILE *cl_avidemo_soundfile = NULL;
  37 void S_CaptureAVISound(portable_samplepair_t *buf, int length)
  38 {
  39         int i, n;
  40         qbyte out[PAINTBUFFER_SIZE * 4];
  41         char filename[MAX_OSPATH];
  42
  43         if (cl_avidemo.value >= 0.1f)
  44         {
  45                 if (cl_avidemo_soundfile == NULL)
  46                 {
  47                         sprintf (filename, "%s/dpavi.wav", com_gamedir);
  48                         cl_avidemo_soundfile = fopen(filename, "wb");
  49                         memset(out, 0, 44);
  50                         fwrite(out, 1, 44, cl_avidemo_soundfile);
  51                         // header will be filled out when file is closed
  52                 }
  53                 fseek(cl_avidemo_soundfile, 0, SEEK_END);
  54                 // write the sound buffer as little endian 16bit interleaved stereo
  55                 for(i = 0;i < length;i++)
  56                 {
  57                         n = buf[i].left >> 2; // quiet enough to prevent clipping most of the time
  58                         n = bound(-32768, n, 32767);
  59                         out[i*4+0] = n & 0xFF;
  60                         out[i*4+1] = (n >> 8) & 0xFF;
  61                         n = buf[i].right >> 2; // quiet enough to prevent clipping most of the time
  62                         n = bound(-32768, n, 32767);
  63                         out[i*4+2] = n & 0xFF;
  64                         out[i*4+3] = (n >> 8) & 0xFF;
  65                 }
  66                 if (fwrite(out, 4, length, cl_avidemo_soundfile) < length)
  67                 {
  68                         Cvar_SetValueQuick(&cl_avidemo, 0);
  69                         Con_Printf("avi saving sound failed, out of disk space?  stopping avi demo capture.\n");
  70                 }
  71         }
  72         else if (cl_avidemo_soundfile)
  73         {
  74                 // file has not been closed yet, close it
  75                 fseek(cl_avidemo_soundfile, 0, SEEK_END);
  76                 i = ftell(cl_avidemo_soundfile);
  77
  78                 //"RIFF", (int) unknown (chunk size), "WAVE",
  79                 //"fmt ", (int) 16 (chunk size), (short) format 1 (uncompressed PCM), (short) 2 channels, (int) unknown rate, (int) unknown bytes per second, (short) 4 bytes per sample (channels * bytes per channel), (short) 16 bits per channel
  80                 //"data", (int) unknown (chunk size)
  81                 memcpy(out, "RIFF****WAVEfmt \x10\x00\x00\x00\x01\x00\x02\x00********\x04\x00\x10\x00data****", 44);
  82                 // the length of the whole RIFF chunk
  83                 n = i - 8;
  84                 out[4] = (n) & 0xFF;
  85                 out[5] = (n >> 8) & 0xFF;
  86                 out[6] = (n >> 16) & 0xFF;
  87                 out[7] = (n >> 24) & 0xFF;
  88                 // rate
  89                 n = shm->speed;
  90                 out[24] = (n) & 0xFF;
  91                 out[25] = (n >> 8) & 0xFF;
  92                 out[26] = (n >> 16) & 0xFF;
  93                 out[27] = (n >> 24) & 0xFF;
  94                 // bytes per second (rate * channels * bytes per channel)
  95                 n = shm->speed * 4;
  96                 out[28] = (n) & 0xFF;
  97                 out[29] = (n >> 8) & 0xFF;
  98                 out[30] = (n >> 16) & 0xFF;
  99                 out[31] = (n >> 24) & 0xFF;
 100                 // the length of the data chunk
 101                 n = i - 44;
 102                 out[40] = (n) & 0xFF;
 103                 out[41] = (n >> 8) & 0xFF;
 104                 out[42] = (n >> 16) & 0xFF;
 105                 out[43] = (n >> 24) & 0xFF;
 106
 107                 fseek(cl_avidemo_soundfile, 0, SEEK_SET);
 108                 fwrite(out, 1, 44, cl_avidemo_soundfile);
 109                 fclose(cl_avidemo_soundfile);
 110                 cl_avidemo_soundfile = NULL;
 111         }
 112 }
 113 */
 114
 115 void S_TransferPaintBuffer(int endtime)
 116 {
 117         void *pbuf;
 118         if ((pbuf = S_LockBuffer()))
 119         {
 120                 int i;
 121                 int *snd_p;
 122                 int snd_vol;
 123                 int lpaintedtime;
 124                 int snd_linear_count;
 125                 int val;
 126                 snd_p = (int *) paintbuffer;
 127                 snd_vol = volume.value*256;
 128                 lpaintedtime = paintedtime;
 129                 if (shm->samplebits == 16)
 130                 {
 131                         // 16bit
 132                         short *snd_out;
 133                         if (shm->channels == 2)
 134                         {
 135                                 // 16bit 2 channels (stereo)
 136                                 while (lpaintedtime < endtime)
 137                                 {
 138                                         // handle recirculating buffer issues
 139                                         i = lpaintedtime & ((shm->samples >> 1) - 1);
 140                                         snd_out = (short *) pbuf + (i << 1);
 141                                         snd_linear_count = (shm->samples >> 1) - i;
 142                                         if (snd_linear_count > endtime - lpaintedtime)
 143                                                 snd_linear_count = endtime - lpaintedtime;
 144                                         snd_linear_count <<= 1;
 145                                         if (snd_swapstereo.value)
 146                                         {
 147                                                 for (i = 0;i < snd_linear_count;i += 2)
 148                                                 {
 149                                                         val = (snd_p[i + 1] * snd_vol) >> 8;
 150                                                         snd_out[i    ] = bound(-32768, val, 32767);
 151                                                         val = (snd_p[i    ] * snd_vol) >> 8;
 152                                                         snd_out[i + 1] = bound(-32768, val, 32767);
 153                                                 }
 154                                         }
 155                                         else
 156                                         {
 157                                                 for (i = 0;i < snd_linear_count;i += 2)
 158                                                 {
 159                                                         val = (snd_p[i    ] * snd_vol) >> 8;
 160                                                         snd_out[i    ] = bound(-32768, val, 32767);
 161                                                         val = (snd_p[i + 1] * snd_vol) >> 8;
 162                                                         snd_out[i + 1] = bound(-32768, val, 32767);
 163                                                 }
 164                                         }
 165                                         snd_p += snd_linear_count;
 166                                         lpaintedtime += (snd_linear_count >> 1);
 167                                 }
 168                         }
 169                         else
 170                         {
 171                                 // 16bit 1 channel (mono)
 172                                 while (lpaintedtime < endtime)
 173                                 {
 174                                         // handle recirculating buffer issues
 175                                         i = lpaintedtime & (shm->samples - 1);
 176                                         snd_out = (short *) pbuf + i;
 177                                         snd_linear_count = shm->samples - i;
 178                                         if (snd_linear_count > endtime - lpaintedtime)
 179                                                 snd_linear_count = endtime - lpaintedtime;
 180                                         for (i = 0;i < snd_linear_count;i++)
 181                                         {
 182                                                 val = ((snd_p[i * 2 + 0] + snd_p[i * 2 + 1]) * snd_vol) >> 9;
 183                                                 snd_out[i] = bound(-32768, val, 32767);
 184                                         }
 185                                         snd_p += snd_linear_count << 1;
 186                                         lpaintedtime += snd_linear_count;
 187                                 }
 188                         }
 189                 }
 190                 else
 191                 {
 192                         // 8bit
 193                         unsigned char *snd_out;
 194                         if (shm->channels == 2)
 195                         {
 196                                 // 8bit 2 channels (stereo)
 197                                 while (lpaintedtime < endtime)
 198                                 {
 199                                         // handle recirculating buffer issues
 200                                         i = lpaintedtime & ((shm->samples >> 1) - 1);
 201                                         snd_out = (unsigned char *) pbuf + (i << 1);
 202                                         snd_linear_count = (shm->samples >> 1) - i;
 203                                         if (snd_linear_count > endtime - lpaintedtime)
 204                                                 snd_linear_count = endtime - lpaintedtime;
 205                                         snd_linear_count <<= 1;
 206                                         if (snd_swapstereo.value)
 207                                         {
 208                                                 for (i = 0;i < snd_linear_count;i += 2)
 209                                                 {
 210                                                         val = ((snd_p[i + 1] * snd_vol) >> 16) + 128;
 211                                                         snd_out[i    ] = bound(0, val, 255);
 212                                                         val = ((snd_p[i    ] * snd_vol) >> 16) + 128;
 213                                                         snd_out[i + 1] = bound(0, val, 255);
 214                                                 }
 215                                         }
 216                                         else
 217                                         {
 218                                                 for (i = 0;i < snd_linear_count;i += 2)
 219                                                 {
 220                                                         val = ((snd_p[i    ] * snd_vol) >> 16) + 128;
 221                                                         snd_out[i    ] = bound(0, val, 255);
 222                                                         val = ((snd_p[i + 1] * snd_vol) >> 16) + 128;
 223                                                         snd_out[i + 1] = bound(0, val, 255);
 224                                                 }
 225                                         }
 226                                         snd_p += snd_linear_count;
 227                                         lpaintedtime += (snd_linear_count >> 1);
 228                                 }
 229                         }
 230                         else
 231                         {
 232                                 // 8bit 1 channel (mono)
 233                                 while (lpaintedtime < endtime)
 234                                 {
 235                                         // handle recirculating buffer issues
 236                                         i = lpaintedtime & (shm->samples - 1);
 237                                         snd_out = (unsigned char *) pbuf + i;
 238                                         snd_linear_count = shm->samples - i;
 239                                         if (snd_linear_count > endtime - lpaintedtime)
 240                                                 snd_linear_count = endtime - lpaintedtime;
 241                                         for (i = 0;i < snd_linear_count;i++)
 242                                         {
 243                                                 val = (((snd_p[i * 2] + snd_p[i * 2 + 1]) * snd_vol) >> 17) + 128;
 244                                                 snd_out[i    ] = bound(0, val, 255);
 245                                         }
 246                                         snd_p += snd_linear_count << 1;
 247                                         lpaintedtime += snd_linear_count;
 248                                 }
 249                         }
 250                 }
 251
 252                 S_UnlockBuffer();
 253         }
 254 }
 255
 256
 257 /*
 258 ===============================================================================
 259
 260 CHANNEL MIXING
 261
 262 ===============================================================================
 263 */
 264
 265 void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
 266 void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);
 267
 268 void S_PaintChannels(int endtime)
 269 {
 270         int i;
 271         int end;
 272         channel_t *ch;
 273         sfxcache_t *sc;
 274         int ltime, count;
 275
 276         while (paintedtime < endtime)
 277         {
 278                 // if paintbuffer is smaller than DMA buffer
 279                 end = endtime;
 280                 if (endtime - paintedtime > PAINTBUFFER_SIZE)
 281                         end = paintedtime + PAINTBUFFER_SIZE;
 282
 283                 // clear the paint buffer, filling it with data from rawsamples (music/video/whatever)
 284                 S_RawSamples_Dequeue(&paintbuffer->left, end - paintedtime);
 285
 286                 // paint in the channels.
 287                 ch = channels;
 288                 for (i=0; i<total_channels ; i++, ch++)
 289                 {
 290                         if (!ch->sfx)
 291                                 continue;
 292                         if (!ch->leftvol && !ch->rightvol)
 293                                 continue;
 294                         sc = S_LoadSound (ch->sfx, true);
 295                         if (!sc)
 296                                 continue;
 297
 298                         ltime = paintedtime;
 299
 300                         while (ltime < end)
 301                         {
 302                                 // paint up to end
 303                                 if (ch->end < end)
 304                                         count = ch->end - ltime;
 305                                 else
 306                                         count = end - ltime;
 307
 308                                 if (count > 0)
 309                                 {
 310                                         if (sc->width == 1)
 311                                                 SND_PaintChannelFrom8(ch, sc, count);
 312                                         else
 313                                                 SND_PaintChannelFrom16(ch, sc, count);
 314
 315                                         ltime += count;
 316                                 }
 317
 318                                 // if at end of loop, restart
 319                                 if (ltime >= ch->end)
 320                                 {
 321                                         if (sc->loopstart >= 0)
 322                                         {
 323                                                 ch->pos = sc->loopstart;
 324                                                 ch->end = ltime + sc->length - ch->pos;
 325                                         }
 326                                         else
 327                                         {
 328                                                 // channel just stopped
 329                                                 ch->sfx = NULL;
 330                                                 break;
 331                                         }
 332                                 }
 333                         }
 334                 }
 335
 336                 // transfer out according to DMA format
 337                 //S_CaptureAVISound(paintbuffer, end - paintedtime);
 338                 S_TransferPaintBuffer(end);
 339                 paintedtime = end;
 340         }
 341 }
 342
 343 void SND_InitScaletable (void)
 344 {
 345         int i, j;
 346
 347         for (i = 0;i < 32;i++)
 348                 for (j = 0;j < 256;j++)
 349                         snd_scaletable[i][j] = ((signed char)j) * i * 8;
 350 }
 351
 352
 353 void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
 354 {
 355         int *lscale, *rscale;
 356         unsigned char *sfx;
 357         int i;
 358
 359         if (ch->leftvol > 255)
 360                 ch->leftvol = 255;
 361         if (ch->rightvol > 255)
 362                 ch->rightvol = 255;
 363
 364         lscale = snd_scaletable[ch->leftvol >> 3];
 365         rscale = snd_scaletable[ch->rightvol >> 3];
 366         if (sc->stereo)
 367         {
 368                 // LordHavoc: stereo sound support, and optimizations
 369                 sfx = (unsigned char *)sc->data + ch->pos * 2;
 370
 371                 for (i=0 ; i<count ; i++)
 372                 {
 373                         paintbuffer[i].left += lscale[*sfx++];
 374                         paintbuffer[i].right += rscale[*sfx++];
 375                 }
 376
 377         }
 378         else
 379         {
 380                 sfx = (unsigned char *)sc->data + ch->pos;
 381
 382                 for (i=0 ; i<count ; i++)
 383                 {
 384                         paintbuffer[i].left += lscale[*sfx];
 385                         paintbuffer[i].right += rscale[*sfx++];
 386                 }
 387
 388         }
 389         ch->pos += count;
 390 }
 391
 392 void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
 393 {
 394         int leftvol, rightvol;
 395         signed short *sfx;
 396         int i;
 397
 398         leftvol = ch->leftvol;
 399         rightvol = ch->rightvol;
 400         if (sc->stereo)
 401         {
 402                 // LordHavoc: stereo sound support, and optimizations
 403                 sfx = (signed short *)sc->data + ch->pos * 2;
 404
 405                 for (i=0 ; i<count ; i++)
 406                 {
 407                         paintbuffer[i].left += (*sfx++ * leftvol) >> 8;
 408                         paintbuffer[i].right += (*sfx++ * rightvol) >> 8;
 409                 }
 410         }
 411         else
 412         {
 413                 sfx = (signed short *)sc->data + ch->pos;
 414
 415                 for (i=0 ; i<count ; i++)
 416                 {
 417                         paintbuffer[i].left += (*sfx * leftvol) >> 8;
 418                         paintbuffer[i].right += (*sfx++ * rightvol) >> 8;
 419                 }
 420         }
 421
 422         ch->pos += count;
 423 }
 424