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