src/sound.c

   1 /***********************************************************
   2 *  Rocks'n'Diamonds -- McDuffin Strikes Back!              *
   3 *----------------------------------------------------------*
   4 *  (c) 1995-98 Artsoft Entertainment                       *
   5 *              Holger Schemel                              *
   6 *              Oststrasse 11a                              *
   7 *              33604 Bielefeld                             *
   8 *              phone: ++49 +521 290471                     *
   9 *              email: aeglos@valinor.owl.de                *
  10 *----------------------------------------------------------*
  11 *  sound.c                                                 *
  12 ***********************************************************/
  13
  14 #include "sound.h"
  15 #include "misc.h"
  16
  17 /*** THE STUFF BELOW IS ONLY USED BY THE SOUND SERVER CHILD PROCESS ***/
  18
  19 static int playing_sounds = 0;
  20 static struct SoundControl playlist[MAX_SOUNDS_PLAYING];
  21 static struct SoundControl emptySoundControl =
  22 {
  23   -1,0,0, FALSE,FALSE,FALSE,FALSE,FALSE, 0,0L,0L,NULL
  24 };
  25
  26 #ifndef MSDOS
  27 static int stereo_volume[PSND_MAX_LEFT2RIGHT+1];
  28 static char premix_first_buffer[SND_BLOCKSIZE];
  29 #ifdef VOXWARE
  30 static char premix_left_buffer[SND_BLOCKSIZE];
  31 static char premix_right_buffer[SND_BLOCKSIZE];
  32 static int premix_last_buffer[SND_BLOCKSIZE];
  33 #endif /* VOXWARE */
  34 static unsigned char playing_buffer[SND_BLOCKSIZE];
  35 #endif /* MSDOS */
  36
  37 /* forward declaration of internal functions */
  38 #ifdef VOXWARE
  39 static void SoundServer_InsertNewSound(struct SoundControl);
  40 #endif
  41 #ifndef VOXWARE
  42 #ifndef MSDOS
  43 static unsigned char linear_to_ulaw(int);
  44 static int ulaw_to_linear(unsigned char);
  45 #endif
  46 #endif
  47 #ifdef HPUX_AUDIO
  48 static void HPUX_Audio_Control();
  49 #endif
  50 #ifdef MSDOS
  51 static void SoundServer_InsertNewSound(struct SoundControl);
  52 static void SoundServer_StopSound(int);
  53 static void SoundServer_StopAllSounds();
  54 #endif
  55
  56 void SoundServer()
  57 {
  58   int i;
  59 #ifndef MSDOS
  60   struct SoundControl snd_ctrl;
  61   fd_set sound_fdset;
  62
  63   close(sound_pipe[1]);         /* no writing into pipe needed */
  64 #endif
  65
  66   for(i=0;i<MAX_SOUNDS_PLAYING;i++)
  67     playlist[i] = emptySoundControl;
  68   playing_sounds = 0;
  69
  70 #ifndef MSDOS
  71   stereo_volume[PSND_MAX_LEFT2RIGHT] = 0;
  72   for(i=0;i<PSND_MAX_LEFT2RIGHT;i++)
  73     stereo_volume[i] =
  74       (int)sqrt((float)(PSND_MAX_LEFT2RIGHT*PSND_MAX_LEFT2RIGHT-i*i));
  75
  76 #ifdef HPUX_AUDIO
  77   HPUX_Audio_Control();
  78 #endif
  79
  80   FD_ZERO(&sound_fdset);
  81   FD_SET(sound_pipe[0], &sound_fdset);
  82
  83   while(1)      /* wait for sound playing commands from client */
  84   {
  85     FD_SET(sound_pipe[0], &sound_fdset);
  86     select(sound_pipe[0]+1, &sound_fdset, NULL, NULL, NULL);
  87     if (!FD_ISSET(sound_pipe[0], &sound_fdset))
  88       continue;
  89     if (read(sound_pipe[0], &snd_ctrl, sizeof(snd_ctrl)) != sizeof(snd_ctrl))
  90       Error(ERR_EXIT_SOUND_SERVER, "broken pipe - no sounds");
  91
  92 #ifdef VOXWARE
  93
  94     if (snd_ctrl.fade_sound)
  95     {
  96       if (!playing_sounds)
  97         continue;
  98
  99       for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 100         if (snd_ctrl.stop_all_sounds || playlist[i].nr == snd_ctrl.nr)
 101           playlist[i].fade_sound = TRUE;
 102     }
 103     else if (snd_ctrl.stop_all_sounds)
 104     {
 105       if (!playing_sounds)
 106         continue;
 107
 108       for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 109         playlist[i]=emptySoundControl;
 110       playing_sounds=0;
 111
 112       close(sound_device);
 113     }
 114     else if (snd_ctrl.stop_sound)
 115     {
 116       if (!playing_sounds)
 117         continue;
 118
 119       for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 120         if (playlist[i].nr == snd_ctrl.nr)
 121         {
 122           playlist[i]=emptySoundControl;
 123           playing_sounds--;
 124         }
 125
 126       if (!playing_sounds)
 127         close(sound_device);
 128     }
 129
 130     if (playing_sounds || snd_ctrl.active)
 131     {
 132       struct timeval delay = { 0, 0 };
 133       byte *sample_ptr;
 134       long sample_size;
 135       static long max_sample_size = 0;
 136       static long fragment_size = 0;
 137       /* Even if the stereo flag is used as being boolean, it must be
 138          defined as an integer, else 'ioctl()' will fail! */
 139       int stereo = TRUE;
 140       int sample_rate = 8000;
 141
 142       if (playing_sounds || (sound_device=open(sound_device_name,O_WRONLY))>=0)
 143       {
 144         if (!playing_sounds)    /* we just opened the audio device */
 145         {
 146           /* 2 buffers / 512 bytes, giving 1/16 second resolution */
 147           /* (with stereo the effective buffer size will shrink to 256) */
 148           fragment_size = 0x00020009;
 149
 150           if (ioctl(sound_device, SNDCTL_DSP_SETFRAGMENT, &fragment_size) < 0)
 151             Error(ERR_EXIT_SOUND_SERVER,
 152                   "cannot set fragment size of /dev/dsp - no sounds");
 153
 154           /* try if we can use stereo sound */
 155           if (ioctl(sound_device, SNDCTL_DSP_STEREO, &stereo) < 0)
 156           {
 157 #ifdef DEBUG
 158             static boolean reported = FALSE;
 159
 160             if (!reported)
 161             {
 162               Error(ERR_RETURN, "cannot get stereo sound on /dev/dsp");
 163               reported = TRUE;
 164             }
 165 #endif
 166             stereo = FALSE;
 167           }
 168
 169           if (ioctl(sound_device, SNDCTL_DSP_SPEED, &sample_rate) < 0)
 170             Error(ERR_EXIT_SOUND_SERVER,
 171                   "cannot set sample rate of /dev/dsp - no sounds");
 172
 173           /* get the real fragmentation size; this should return 512 */
 174           if (ioctl(sound_device, SNDCTL_DSP_GETBLKSIZE, &fragment_size) < 0)
 175             Error(ERR_EXIT_SOUND_SERVER,
 176                   "cannot get fragment size of /dev/dsp - no sounds");
 177
 178           max_sample_size = fragment_size / (stereo ? 2 : 1);
 179         }
 180
 181         if (snd_ctrl.active)    /* new sound has arrived */
 182           SoundServer_InsertNewSound(snd_ctrl);
 183
 184         while(playing_sounds &&
 185               select(sound_pipe[0]+1,&sound_fdset,NULL,NULL,&delay)<1)
 186         {
 187           FD_SET(sound_pipe[0], &sound_fdset);
 188
 189           /* first clear the last premixing buffer */
 190           memset(premix_last_buffer,0,fragment_size*sizeof(int));
 191
 192           for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 193           {
 194             int j;
 195
 196             if (!playlist[i].active)
 197               continue;
 198
 199             /* get pointer and size of the actual sound sample */
 200             sample_ptr = playlist[i].data_ptr+playlist[i].playingpos;
 201             sample_size =
 202               MIN(max_sample_size,playlist[i].data_len-playlist[i].playingpos);
 203             playlist[i].playingpos += sample_size;
 204
 205             /* fill the first mixing buffer with original sample */
 206             memcpy(premix_first_buffer,sample_ptr,sample_size);
 207
 208             /* are we about to restart a looping sound? */
 209             if (playlist[i].loop && sample_size<max_sample_size)
 210             {
 211               playlist[i].playingpos = max_sample_size-sample_size;
 212               memcpy(premix_first_buffer+sample_size,
 213                      playlist[i].data_ptr,max_sample_size-sample_size);
 214               sample_size = max_sample_size;
 215             }
 216
 217             /* decrease volume if sound is fading out */
 218             if (playlist[i].fade_sound &&
 219                 playlist[i].volume>=PSND_MAX_VOLUME/10)
 220               playlist[i].volume-=PSND_MAX_VOLUME/20;
 221
 222             /* adjust volume of actual sound sample */
 223             if (playlist[i].volume != PSND_MAX_VOLUME)
 224               for(j=0;j<sample_size;j++)
 225                 premix_first_buffer[j] =
 226                   (playlist[i].volume * (int)premix_first_buffer[j])
 227                     >> PSND_MAX_VOLUME_BITS;
 228
 229             /* fill the last mixing buffer with stereo or mono sound */
 230             if (stereo)
 231             {
 232               int middle_pos = PSND_MAX_LEFT2RIGHT/2;
 233               int left_volume = stereo_volume[middle_pos+playlist[i].stereo];
 234               int right_volume = stereo_volume[middle_pos-playlist[i].stereo];
 235
 236               for(j=0;j<sample_size;j++)
 237               {
 238                 premix_left_buffer[j] =
 239                   (left_volume * (int)premix_first_buffer[j])
 240                     >> PSND_MAX_LEFT2RIGHT_BITS;
 241                 premix_right_buffer[j] =
 242                   (right_volume * (int)premix_first_buffer[j])
 243                     >> PSND_MAX_LEFT2RIGHT_BITS;
 244                 premix_last_buffer[2*j+0] += premix_left_buffer[j];
 245                 premix_last_buffer[2*j+1] += premix_right_buffer[j];
 246               }
 247             }
 248             else
 249             {
 250               for(j=0;j<sample_size;j++)
 251                 premix_last_buffer[j] += (int)premix_first_buffer[j];
 252             }
 253
 254             /* delete completed sound entries from the playlist */
 255             if (playlist[i].playingpos >= playlist[i].data_len)
 256             {
 257               if (playlist[i].loop)
 258                 playlist[i].playingpos = 0;
 259               else
 260               {
 261                 playlist[i] = emptySoundControl;
 262                 playing_sounds--;
 263               }
 264             }
 265             else if (playlist[i].volume <= PSND_MAX_VOLUME/10)
 266             {
 267               playlist[i] = emptySoundControl;
 268               playing_sounds--;
 269             }
 270           }
 271
 272           /* put last mixing buffer to final playing buffer */
 273           for(i=0;i<fragment_size;i++)
 274           {
 275             if (premix_last_buffer[i]<-255)
 276               playing_buffer[i] = 0;
 277             else if (premix_last_buffer[i]>255)
 278               playing_buffer[i] = 255;
 279             else
 280               playing_buffer[i] = (premix_last_buffer[i]>>1)^0x80;
 281           }
 282
 283           /* finally play the sound fragment */
 284           write(sound_device,playing_buffer,fragment_size);
 285         }
 286
 287         /* if no sounds playing, free device for other sound programs */
 288         if (!playing_sounds)
 289           close(sound_device);
 290       }
 291     }
 292
 293 #else /* !VOXWARE */
 294
 295     if (snd_ctrl.active && !snd_ctrl.loop)
 296     {
 297       struct timeval delay = { 0, 0 };
 298       byte *sample_ptr;
 299       long sample_size, max_sample_size = SND_BLOCKSIZE;
 300       long sample_rate = 8000;  /* standard "/dev/audio" sampling rate */
 301       int wait_percent = 90;    /* wait 90% of the real playing time */
 302       int i;
 303
 304       if ((sound_device=open(sound_device_name,O_WRONLY))>=0)
 305       {
 306         playing_sounds = 1;
 307
 308         while(playing_sounds &&
 309               select(sound_pipe[0]+1,&sound_fdset,NULL,NULL,&delay)<1)
 310         {
 311           FD_SET(sound_pipe[0], &sound_fdset);
 312
 313           /* get pointer and size of the actual sound sample */
 314           sample_ptr = snd_ctrl.data_ptr + snd_ctrl.playingpos;
 315           sample_size =
 316             MIN(max_sample_size, snd_ctrl.data_len - snd_ctrl.playingpos);
 317           snd_ctrl.playingpos += sample_size;
 318
 319           /* fill the first mixing buffer with original sample */
 320           memcpy(premix_first_buffer,sample_ptr,sample_size);
 321
 322
 323           /* adjust volume of actual sound sample */
 324           if (snd_ctrl.volume != PSND_MAX_VOLUME)
 325             for(i=0;i<sample_size;i++)
 326               premix_first_buffer[i] =
 327                 (snd_ctrl.volume * (int)premix_first_buffer[i])
 328                   >> PSND_MAX_VOLUME_BITS;
 329
 330           for(i=0;i<sample_size;i++)
 331             playing_buffer[i] =
 332               linear_to_ulaw(((int)premix_first_buffer[i]) << 8);
 333
 334           if (snd_ctrl.playingpos >= snd_ctrl.data_len)
 335             playing_sounds = 0;
 336
 337           /* finally play the sound fragment */
 338           write(sound_device,playing_buffer,sample_size);
 339
 340           delay.tv_sec = 0;
 341           delay.tv_usec = ((sample_size*10*wait_percent)/(sample_rate))*1000;
 342         }
 343         close(sound_device);
 344       }
 345     }
 346
 347 #endif /* !VOXWARE */
 348
 349   }
 350 #endif /* !MSDOS */
 351 }
 352
 353 #ifdef MSDOS
 354 static void sound_handler(struct SoundControl snd_ctrl)
 355 {
 356   int i;
 357
 358   if (snd_ctrl.fade_sound)
 359   {
 360     if (!playing_sounds)
 361       return;
 362
 363     for (i=0; i<MAX_SOUNDS_PLAYING; i++)
 364       if ((snd_ctrl.stop_all_sounds || playlist[i].nr == snd_ctrl.nr) &&
 365           !playlist[i].fade_sound)
 366       {
 367         playlist[i].fade_sound = TRUE;
 368         if (voice_check(playlist[i].voice))
 369           voice_ramp_volume(playlist[i].voice, 1000, 0);
 370         playlist[i].loop = PSND_NO_LOOP;
 371       }
 372   }
 373   else if (snd_ctrl.stop_all_sounds)
 374   {
 375     if (!playing_sounds)
 376       return;
 377     SoundServer_StopAllSounds();
 378   }
 379   else if (snd_ctrl.stop_sound)
 380   {
 381     if (!playing_sounds)
 382       return;
 383     SoundServer_StopSound(snd_ctrl.nr);
 384   }
 385
 386   for (i=0; i<MAX_SOUNDS_PLAYING; i++)
 387   {
 388     if (!playlist[i].active || playlist[i].loop)
 389       continue;
 390
 391     playlist[i].playingpos = voice_get_position(playlist[i].voice);
 392     playlist[i].volume = voice_get_volume(playlist[i].voice);
 393     if (playlist[i].playingpos == -1 || !playlist[i].volume)
 394     {
 395       deallocate_voice(playlist[i].voice);
 396       playlist[i] = emptySoundControl;
 397       playing_sounds--;
 398     }
 399   }
 400
 401   if (snd_ctrl.active)
 402     SoundServer_InsertNewSound(snd_ctrl);
 403 }
 404 #endif /* MSDOS */
 405
 406 static void SoundServer_InsertNewSound(struct SoundControl snd_ctrl)
 407 {
 408   int i, k;
 409
 410   /* if playlist is full, remove oldest sound */
 411   if (playing_sounds==MAX_SOUNDS_PLAYING)
 412   {
 413     int longest=0, longest_nr=0;
 414
 415     for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 416     {
 417 #ifndef MSDOS
 418       int actual = 100 * playlist[i].playingpos / playlist[i].data_len;
 419 #else
 420       int actual = playlist[i].playingpos;
 421 #endif
 422
 423       if (!playlist[i].loop && actual>longest)
 424       {
 425         longest=actual;
 426         longest_nr=i;
 427       }
 428     }
 429 #ifdef MSDOS
 430     voice_set_volume(playlist[longest_nr].voice, 0);
 431     deallocate_voice(playlist[longest_nr].voice);
 432 #endif
 433     playlist[longest_nr] = emptySoundControl;
 434     playing_sounds--;
 435   }
 436
 437   /* check if sound is already being played (and how often) */
 438   for(k=0,i=0;i<MAX_SOUNDS_PLAYING;i++)
 439   {
 440     if (playlist[i].nr == snd_ctrl.nr)
 441       k++;
 442   }
 443
 444   /* restart loop sounds only if they are just fading out */
 445   if (k>=1 && snd_ctrl.loop)
 446   {
 447     for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 448     {
 449       if (playlist[i].nr == snd_ctrl.nr && playlist[i].fade_sound)
 450       {
 451         playlist[i].fade_sound = FALSE;
 452         playlist[i].volume = PSND_MAX_VOLUME;
 453 #ifdef MSDOS
 454         playlist[i].loop = PSND_LOOP;
 455         voice_stop_volumeramp(playlist[i].voice);
 456         voice_ramp_volume(playlist[i].voice, playlist[i].volume, 1000);
 457 #endif
 458       }
 459     }
 460     return;
 461   }
 462
 463   /* don't play sound more than n times simultaneously (with n == 2 for now) */
 464   if (k>=2)
 465   {
 466     int longest=0, longest_nr=0;
 467
 468     /* look for oldest equal sound */
 469     for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 470     {
 471       int actual;
 472
 473       if (!playlist[i].active || playlist[i].nr != snd_ctrl.nr)
 474         continue;
 475
 476 #ifndef MSDOS
 477       actual = 100 * playlist[i].playingpos / playlist[i].data_len;
 478 #else
 479       actual = playlist[i].playingpos;
 480 #endif
 481       if (actual>=longest)
 482       {
 483         longest=actual;
 484         longest_nr=i;
 485       }
 486     }
 487 #ifdef MSDOS
 488     voice_set_volume(playlist[longest_nr].voice, 0);
 489     deallocate_voice(playlist[longest_nr].voice);
 490 #endif
 491     playlist[longest_nr] = emptySoundControl;
 492     playing_sounds--;
 493   }
 494
 495   /* neuen Sound in Liste packen */
 496   for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 497   {
 498     if (!playlist[i].active)
 499     {
 500       playlist[i] = snd_ctrl;
 501       playing_sounds++;
 502 #ifdef MSDOS
 503       playlist[i].voice = allocate_voice(Sound[snd_ctrl.nr].sample_ptr);
 504       if(snd_ctrl.loop)
 505         voice_set_playmode(playlist[i].voice, PLAYMODE_LOOP);
 506       voice_set_volume(playlist[i].voice, snd_ctrl.volume);
 507       voice_set_pan(playlist[i].voice, snd_ctrl.stereo);
 508       voice_start(playlist[i].voice);
 509 #endif
 510       break;
 511     }
 512   }
 513 }
 514
 515 /*
 516 void SoundServer_FadeSound(int nr)
 517 {
 518   int i;
 519
 520   if (!playing_sounds)
 521     return;
 522
 523   for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 524     if (snd_ctrl.stop_all_sounds || playlist[i].nr == snd_ctrl.nr)
 525       playlist[i].fade_sound = TRUE;
 526 }
 527 */
 528
 529 #ifdef MSDOS
 530 static void SoundServer_StopSound(int nr)
 531 {
 532   int i;
 533
 534   if (!playing_sounds)
 535     return;
 536
 537   for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 538     if (playlist[i].nr == nr)
 539     {
 540 #ifdef MSDOS
 541       voice_set_volume(playlist[i].voice, 0);
 542       deallocate_voice(playlist[i].voice);
 543 #endif
 544       playlist[i] = emptySoundControl;
 545       playing_sounds--;
 546     }
 547
 548 #ifndef MSDOS
 549   if (!playing_sounds)
 550     close(sound_device);
 551 #endif
 552 }
 553
 554 static void SoundServer_StopAllSounds()
 555 {
 556   int i;
 557
 558   for(i=0;i<MAX_SOUNDS_PLAYING;i++)
 559   {
 560 #ifdef MSDOS
 561     voice_set_volume(playlist[i].voice, 0);
 562     deallocate_voice(playlist[i].voice);
 563 #endif
 564     playlist[i]=emptySoundControl;
 565   }
 566   playing_sounds = 0;
 567
 568 #ifndef MSDOS
 569   close(sound_device);
 570 #endif
 571 }
 572 #endif /* MSDOS */
 573
 574 #ifdef HPUX_AUDIO
 575 static void HPUX_Audio_Control()
 576 {
 577   struct audio_describe ainfo;
 578   int audio_ctl;
 579
 580   audio_ctl = open("/dev/audioCtl", O_WRONLY | O_NDELAY);
 581   if (audio_ctl == -1)
 582     Error(ERR_EXIT_SOUND_SERVER, "cannot open /dev/audioCtl - no sounds");
 583
 584   if (ioctl(audio_ctl, AUDIO_DESCRIBE, &ainfo) == -1)
 585     Error(ERR_EXIT_SOUND_SERVER, "no audio info - no sounds");
 586
 587   if (ioctl(audio_ctl, AUDIO_SET_DATA_FORMAT, AUDIO_FORMAT_ULAW) == -1)
 588     Error(ERR_EXIT_SOUND_SERVER, "ulaw audio not available - no sounds");
 589
 590   ioctl(audio_ctl, AUDIO_SET_CHANNELS, 1);
 591   ioctl(audio_ctl, AUDIO_SET_SAMPLE_RATE, 8000);
 592
 593   close(audio_ctl);
 594 }
 595 #endif /* HPUX_AUDIO */
 596
 597 #ifndef VOXWARE
 598 #ifndef MSDOS
 599 /* these two are stolen from "sox"... :) */
 600
 601 /*
 602 ** This routine converts from linear to ulaw.
 603 **
 604 ** Craig Reese: IDA/Supercomputing Research Center
 605 ** Joe Campbell: Department of Defense
 606 ** 29 September 1989
 607 **
 608 ** References:
 609 ** 1) CCITT Recommendation G.711  (very difficult to follow)
 610 ** 2) "A New Digital Technique for Implementation of Any
 611 **     Continuous PCM Companding Law," Villeret, Michel,
 612 **     et al. 1973 IEEE Int. Conf. on Communications, Vol 1,
 613 **     1973, pg. 11.12-11.17
 614 ** 3) MIL-STD-188-113,"Interoperability and Performance Standards
 615 **     for Analog-to_Digital Conversion Techniques,"
 616 **     17 February 1987
 617 **
 618 ** Input: Signed 16 bit linear sample
 619 ** Output: 8 bit ulaw sample
 620 */
 621
 622 #define ZEROTRAP    /* turn on the trap as per the MIL-STD */
 623 #define BIAS 0x84   /* define the add-in bias for 16 bit samples */
 624 #define CLIP 32635
 625
 626 static unsigned char linear_to_ulaw(int sample)
 627 {
 628   static int exp_lut[256] =
 629   {
 630     0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
 631     4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
 632     5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
 633     5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
 634     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
 635     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
 636     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
 637     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
 638     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 639     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 640     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 641     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 642     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 643     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 644     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 645     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
 646   };
 647
 648   int sign, exponent, mantissa;
 649   unsigned char ulawbyte;
 650
 651   /* Get the sample into sign-magnitude. */
 652   sign = (sample >> 8) & 0x80;          /* set aside the sign */
 653   if (sign != 0)
 654     sample = -sample;                   /* get magnitude */
 655   if (sample > CLIP)
 656     sample = CLIP;                      /* clip the magnitude */
 657
 658   /* Convert from 16 bit linear to ulaw. */
 659   sample = sample + BIAS;
 660   exponent = exp_lut[( sample >> 7 ) & 0xFF];
 661   mantissa = ( sample >> ( exponent + 3 ) ) & 0x0F;
 662   ulawbyte = ~ ( sign | ( exponent << 4 ) | mantissa );
 663 #ifdef ZEROTRAP
 664   if (ulawbyte == 0)
 665     ulawbyte = 0x02;                    /* optional CCITT trap */
 666 #endif
 667
 668   return(ulawbyte);
 669 }
 670
 671 /*
 672 ** This routine converts from ulaw to 16 bit linear.
 673 **
 674 ** Craig Reese: IDA/Supercomputing Research Center
 675 ** 29 September 1989
 676 **
 677 ** References:
 678 ** 1) CCITT Recommendation G.711  (very difficult to follow)
 679 ** 2) MIL-STD-188-113,"Interoperability and Performance Standards
 680 **     for Analog-to_Digital Conversion Techniques,"
 681 **     17 February 1987
 682 **
 683 ** Input: 8 bit ulaw sample
 684 ** Output: signed 16 bit linear sample
 685 */
 686
 687 static int ulaw_to_linear(unsigned char ulawbyte)
 688 {
 689   static int exp_lut[8] = { 0, 132, 396, 924, 1980, 4092, 8316, 16764 };
 690   int sign, exponent, mantissa, sample;
 691
 692   ulawbyte = ~ ulawbyte;
 693   sign = ( ulawbyte & 0x80 );
 694   exponent = ( ulawbyte >> 4 ) & 0x07;
 695   mantissa = ulawbyte & 0x0F;
 696   sample = exp_lut[exponent] + ( mantissa << ( exponent + 3 ) );
 697   if (sign != 0)
 698     sample = -sample;
 699
 700   return(sample);
 701 }
 702 #endif /* !MSDOS */
 703 #endif /* !VOXWARE */
 704
 705 /*** THE STUFF ABOVE IS ONLY USED BY THE SOUND SERVER CHILD PROCESS ***/
 706
 707 /*===========================================================================*/
 708
 709 /*** THE STUFF BELOW IS ONLY USED BY THE MAIN PROCESS ***/
 710
 711 #define CHUNK_ID_LEN            4       /* IFF style chunk id length */
 712 #define WAV_HEADER_SIZE         20      /* size of WAV file header */
 713
 714 boolean LoadSound(struct SoundInfo *snd_info)
 715 {
 716   char filename[256];
 717   char *sound_ext = "wav";
 718 #ifndef MSDOS
 719   byte sound_header_buffer[WAV_HEADER_SIZE];
 720   char chunk[CHUNK_ID_LEN + 1];
 721   int chunk_length, dummy;
 722   FILE *file;
 723   int i;
 724 #endif
 725
 726   sprintf(filename, "%s/%s/%s.%s",
 727           options.base_directory, SOUNDS_DIRECTORY, snd_info->name, sound_ext);
 728
 729 #ifndef MSDOS
 730
 731   if ((file = fopen(filename, "r")) == NULL)
 732   {
 733     Error(ERR_WARN, "cannot open sound file '%s' - no sounds", filename);
 734     return FALSE;
 735   }
 736
 737   /* read chunk "RIFF" */
 738   getFileChunk(file, chunk, &chunk_length, BYTE_ORDER_LITTLE_ENDIAN);
 739   if (strcmp(chunk, "RIFF") != 0)
 740   {
 741     Error(ERR_WARN, "missing 'RIFF' chunk of sound file '%s'", filename);
 742     fclose(file);
 743     return FALSE;
 744   }
 745
 746   /* read chunk "WAVE" */
 747   getFileChunk(file, chunk, &dummy, BYTE_ORDER_LITTLE_ENDIAN);
 748   if (strcmp(chunk, "WAVE") != 0)
 749   {
 750     Error(ERR_WARN, "missing 'WAVE' chunk of sound file '%s'", filename);
 751     fclose(file);
 752     return FALSE;
 753   }
 754
 755   /* read header information */
 756   for (i=0; i<WAV_HEADER_SIZE; i++)
 757     sound_header_buffer[i] = fgetc(file);
 758
 759   /* read chunk "data" */
 760   getFileChunk(file, chunk, &chunk_length, BYTE_ORDER_LITTLE_ENDIAN);
 761   if (strcmp(chunk, "data") != 0)
 762   {
 763     Error(ERR_WARN, "missing 'data' chunk of sound file '%s'", filename);
 764     fclose(file);
 765     return FALSE;
 766   }
 767
 768   snd_info->data_len = chunk_length;
 769   snd_info->data_ptr = checked_malloc(snd_info->data_len);
 770
 771   /* read sound data */
 772   if (fread(snd_info->data_ptr, 1, snd_info->data_len, file) !=
 773       snd_info->data_len)
 774   {
 775     Error(ERR_WARN, "cannot read sound file '%s' - no sounds", filename);
 776     fclose(file);
 777     return FALSE;
 778   }
 779
 780   fclose(file);
 781
 782   for (i=0; i<snd_info->data_len; i++)
 783     snd_info->data_ptr[i] = snd_info->data_ptr[i] ^ 0x80;
 784
 785 #else /* MSDOS */
 786
 787   snd_info->sample_ptr = load_sample(filename);
 788   if (!snd_info->sample_ptr)
 789   {
 790     Error(ERR_WARN, "cannot read sound file '%s' - no sounds", filename);
 791     return(FALSE);
 792   }
 793
 794 #endif /* MSDOS */
 795
 796   return(TRUE);
 797 }
 798
 799 void PlaySound(int nr)
 800 {
 801   PlaySoundExt(nr, PSND_MAX_VOLUME, PSND_MIDDLE, PSND_NO_LOOP);
 802 }
 803
 804 void PlaySoundStereo(int nr, int stereo)
 805 {
 806   PlaySoundExt(nr, PSND_MAX_VOLUME, stereo, PSND_NO_LOOP);
 807 }
 808
 809 void PlaySoundLoop(int nr)
 810 {
 811   PlaySoundExt(nr, PSND_MAX_VOLUME, PSND_MIDDLE, PSND_LOOP);
 812 }
 813
 814 void PlaySoundExt(int nr, int volume, int stereo, boolean loop)
 815 {
 816   struct SoundControl snd_ctrl = emptySoundControl;
 817
 818   if (sound_status==SOUND_OFF || !setup.sound)
 819     return;
 820
 821   if (volume<PSND_MIN_VOLUME)
 822     volume = PSND_MIN_VOLUME;
 823   else if (volume>PSND_MAX_VOLUME)
 824     volume = PSND_MAX_VOLUME;
 825
 826   if (stereo<PSND_MAX_LEFT)
 827     stereo = PSND_MAX_LEFT;
 828   else if (stereo>PSND_MAX_RIGHT)
 829     stereo = PSND_MAX_RIGHT;
 830
 831   snd_ctrl.nr           = nr;
 832   snd_ctrl.volume       = volume;
 833   snd_ctrl.stereo       = stereo;
 834   snd_ctrl.loop         = loop;
 835   snd_ctrl.active       = TRUE;
 836   snd_ctrl.data_ptr     = Sound[nr].data_ptr;
 837   snd_ctrl.data_len     = Sound[nr].data_len;
 838
 839 #ifndef MSDOS
 840   if (write(sound_pipe[1], &snd_ctrl, sizeof(snd_ctrl))<0)
 841   {
 842     Error(ERR_WARN, "cannot pipe to child process - no sounds");
 843     sound_status = SOUND_OFF;
 844     return;
 845   }
 846 #else
 847   sound_handler(snd_ctrl);
 848 #endif
 849 }
 850
 851 void FadeSound(int nr)
 852 {
 853   StopSoundExt(nr, SSND_FADE_SOUND);
 854 }
 855
 856 void FadeSounds()
 857 {
 858   StopSoundExt(-1, SSND_FADE_ALL_SOUNDS);
 859 }
 860
 861 void StopSound(int nr)
 862 {
 863   StopSoundExt(nr, SSND_STOP_SOUND);
 864 }
 865
 866 void StopSounds()
 867 {
 868   StopSoundExt(-1, SSND_STOP_ALL_SOUNDS);
 869 }
 870
 871 void StopSoundExt(int nr, int method)
 872 {
 873   struct SoundControl snd_ctrl = emptySoundControl;
 874
 875   if (sound_status==SOUND_OFF)
 876     return;
 877
 878   if (SSND_FADING(method))
 879     snd_ctrl.fade_sound = TRUE;
 880
 881   if (SSND_ALL(method))
 882     snd_ctrl.stop_all_sounds = TRUE;
 883   else
 884   {
 885     snd_ctrl.nr = nr;
 886     snd_ctrl.stop_sound = TRUE;
 887   }
 888
 889 #ifndef MSDOS
 890   if (write(sound_pipe[1], &snd_ctrl, sizeof(snd_ctrl))<0)
 891   {
 892     Error(ERR_WARN, "cannot pipe to child process - no sounds");
 893     sound_status = SOUND_OFF;
 894     return;
 895   }
 896 #else
 897   sound_handler(snd_ctrl);
 898 #endif
 899 }
 900
 901 void FreeSounds(int num_sounds)
 902 {
 903   int i;
 904
 905   if (sound_status == SOUND_OFF)
 906     return;
 907
 908   for(i=0; i<num_sounds; i++)
 909 #ifndef MSDOS
 910     free(Sound[i].data_ptr);
 911 #else
 912     destroy_sample(Sound[i].sample_ptr);
 913 #endif
 914 }
 915
 916 /*** THE STUFF ABOVE IS ONLY USED BY THE MAIN PROCESS ***/