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