src/sound.c

   1 /* sound.c -- sound support.
   2    Copyright (C) 1998, 1999, 2001 Free Software Foundation.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Written by Gerd Moellmann <gerd@gnu.org>.  Tested with Luigi's
  22    driver on FreeBSD 2.2.7 with a SoundBlaster 16.  */
  23
  24 #include <config.h>
  25
  26 #if defined HAVE_SOUND
  27
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <sys/types.h>
  31 #include <errno.h>
  32 #include "lisp.h"
  33 #include "dispextern.h"
  34 #include "atimer.h"
  35 #include <signal.h>
  36 #include "syssignal.h"
  37
  38 #ifndef MSDOS
  39 #include <sys/ioctl.h>
  40 #endif
  41
  42 /* FreeBSD has machine/soundcard.h.  Voxware sound driver docs mention
  43    sys/soundcard.h.  So, let's try whatever's there.  */
  44
  45 #ifdef HAVE_MACHINE_SOUNDCARD_H
  46 #include <machine/soundcard.h>
  47 #endif
  48 #ifdef HAVE_SYS_SOUNDCARD_H
  49 #include <sys/soundcard.h>
  50 #endif
  51 #ifdef HAVE_SOUNDCARD_H
  52 #include <soundcard.h>
  53 #endif
  54
  55 #ifndef DEFAULT_SOUND_DEVICE
  56 #define DEFAULT_SOUND_DEVICE "/dev/dsp"
  57 #endif
  58
  59 #define abs(X)    ((X) < 0 ? -(X) : (X))
  60
  61 /* Structure forward declarations.  */
  62
  63 struct sound;
  64 struct sound_device;
  65
  66 /* The file header of RIFF-WAVE files (*.wav).  Files are always in
  67    little-endian byte-order.  */
  68
  69 struct wav_header
  70 {
  71   u_int32_t magic;
  72   u_int32_t length;
  73   u_int32_t chunk_type;
  74   u_int32_t chunk_format;
  75   u_int32_t chunk_length;
  76   u_int16_t format;
  77   u_int16_t channels;
  78   u_int32_t sample_rate;
  79   u_int32_t bytes_per_second;
  80   u_int16_t sample_size;
  81   u_int16_t precision;
  82   u_int32_t chunk_data;
  83   u_int32_t data_length;
  84 };
  85
  86 /* The file header of Sun adio files (*.au).  Files are always in
  87    big-endian byte-order.  */
  88
  89 struct au_header
  90 {
  91   /* ASCII ".snd" */
  92   u_int32_t magic_number;
  93
  94   /* Offset of data part from start of file. Minimum value is 24.  */
  95   u_int32_t data_offset;
  96
  97   /* Size of data part, 0xffffffff if unknown.  */
  98   u_int32_t data_size;
  99
 100   /* Data encoding format.
 101      1  8-bit ISDN u-law
 102      2  8-bit linear PCM (REF-PCM)
 103      3  16-bit linear PCM
 104      4  24-bit linear PCM
 105      5  32-bit linear PCM
 106      6  32-bit IEEE floating-point
 107      7  64-bit IEEE floating-point
 108      23 8-bit u-law compressed using CCITT 0.721 ADPCM voice data
 109      encoding scheme.  */
 110   u_int32_t encoding;
 111
 112   /* Number of samples per second.  */
 113   u_int32_t sample_rate;
 114
 115   /* Number of interleaved channels.  */
 116   u_int32_t channels;
 117 };
 118
 119 /* Maximum of all sound file headers sizes.  */
 120
 121 #define MAX_SOUND_HEADER_BYTES \
 122      max (sizeof (struct wav_header), sizeof (struct au_header))
 123
 124 /* Interface structure for sound devices.  */
 125
 126 struct sound_device
 127 {
 128   /* The name of the device or null meaning use a default device name.  */
 129   char *file;
 130
 131   /* File descriptor of the device.  */
 132   int fd;
 133
 134   /* Device-dependent format.  */
 135   int format;
 136
 137   /* Volume (0..100).  Zero means unspecified.  */
 138   int volume;
 139
 140   /* Sample size.  */
 141   int sample_size;
 142
 143   /* Sample rate.  */
 144   int sample_rate;
 145
 146   /* Bytes per second.  */
 147   int bps;
 148
 149   /* 1 = mono, 2 = stereo, 0 = don't set.  */
 150   int channels;
 151
 152   /* Open device SD.  */
 153   void (* open) P_ ((struct sound_device *sd));
 154
 155   /* Close device SD.  */
 156   void (* close) P_ ((struct sound_device *sd));
 157
 158   /* Configure SD accoring to device-dependent parameters.  */
 159   void (* configure) P_ ((struct sound_device *device));
 160
 161   /* Choose a device-dependent format for outputting sound S.  */
 162   void (* choose_format) P_ ((struct sound_device *sd,
 163                               struct sound *s));
 164
 165   /* Write NYBTES bytes from BUFFER to device SD.  */
 166   void (* write) P_ ((struct sound_device *sd, char *buffer, int nbytes));
 167
 168   /* A place for devices to store additional data.  */
 169   void *data;
 170 };
 171
 172 /* An enumerator for each supported sound file type.  */
 173
 174 enum sound_type
 175 {
 176   RIFF,
 177   SUN_AUDIO
 178 };
 179
 180 /* Interface structure for sound files.  */
 181
 182 struct sound
 183 {
 184   /* The type of the file.  */
 185   enum sound_type type;
 186
 187   /* File descriptor of a sound file.  */
 188   int fd;
 189
 190   /* Pointer to sound file header.  This contains header_size bytes
 191      read from the start of a sound file.  */
 192   char *header;
 193
 194   /* Number of bytes raed from sound file.  This is always <=
 195      MAX_SOUND_HEADER_BYTES.  */
 196   int header_size;
 197
 198   /* Sound data, if a string.  */
 199   Lisp_Object data;
 200
 201   /* Play sound file S on device SD.  */
 202   void (* play) P_ ((struct sound *s, struct sound_device *sd));
 203 };
 204
 205 /* Indices of attributes in a sound attributes vector.  */
 206
 207 enum sound_attr
 208 {
 209   SOUND_FILE,
 210   SOUND_DATA,
 211   SOUND_DEVICE,
 212   SOUND_VOLUME,
 213   SOUND_ATTR_SENTINEL
 214 };
 215
 216 /* Symbols.  */
 217
 218 extern Lisp_Object QCfile, QCdata;
 219 Lisp_Object QCvolume, QCdevice;
 220 Lisp_Object Qsound;
 221 Lisp_Object Qplay_sound_functions;
 222
 223 /* These are set during `play-sound' so that sound_cleanup has
 224    access to them.  */
 225
 226 struct sound_device *current_sound_device;
 227 struct sound *current_sound;
 228
 229 /* Function prototypes.  */
 230
 231 static void vox_open P_ ((struct sound_device *));
 232 static void vox_configure P_ ((struct sound_device *));
 233 static void vox_close P_ ((struct sound_device *sd));
 234 static void vox_choose_format P_ ((struct sound_device *, struct sound *));
 235 static void vox_init P_ ((struct sound_device *));
 236 static void vox_write P_ ((struct sound_device *, char *, int));
 237 static void sound_perror P_ ((char *));
 238 static int parse_sound P_ ((Lisp_Object, Lisp_Object *));
 239 static void find_sound_type P_ ((struct sound *));
 240 static u_int32_t le2hl P_ ((u_int32_t));
 241 static u_int16_t le2hs P_ ((u_int16_t));
 242 static u_int32_t be2hl P_ ((u_int32_t));
 243 static int wav_init P_ ((struct sound *));
 244 static void wav_play P_ ((struct sound *, struct sound_device *));
 245 static int au_init P_ ((struct sound *));
 246 static void au_play P_ ((struct sound *, struct sound_device *));
 247
 248 #if 0 /* Currently not used.  */
 249 static u_int16_t be2hs P_ ((u_int16_t));
 250 #endif
 251
 252
 253 \f
 254 /***********************************************************************
 255                                General
 256  ***********************************************************************/
 257
 258 /* Like perror, but signals an error.  */
 259
 260 static void
 261 sound_perror (msg)
 262      char *msg;
 263 {
 264   error ("%s: %s", msg, strerror (errno));
 265 }
 266
 267
 268 /* Parse sound specification SOUND, and fill ATTRS with what is
 269    found.  Value is non-zero if SOUND Is a valid sound specification.
 270    A valid sound specification is a list starting with the symbol
 271    `sound'.  The rest of the list is a property list which may
 272    contain the following key/value pairs:
 273
 274    - `:file FILE'
 275
 276    FILE is the sound file to play.  If it isn't an absolute name,
 277    it's searched under `data-directory'.
 278
 279    - `:data DATA'
 280
 281    DATA is a string containing sound data.  Either :file or :data
 282    may be present, but not both.
 283
 284    - `:device DEVICE'
 285
 286    DEVICE is the name of the device to play on, e.g. "/dev/dsp2".
 287    If not specified, a default device is used.
 288
 289    - `:volume VOL'
 290
 291    VOL must be an integer in the range [0, 100], or a float in the
 292    range [0, 1].  */
 293
 294 static int
 295 parse_sound (sound, attrs)
 296      Lisp_Object sound;
 297      Lisp_Object *attrs;
 298 {
 299   /* SOUND must be a list starting with the symbol `sound'.  */
 300   if (!CONSP (sound) || !EQ (XCAR (sound), Qsound))
 301     return 0;
 302
 303   sound = XCDR (sound);
 304   attrs[SOUND_FILE] = Fplist_get (sound, QCfile);
 305   attrs[SOUND_DATA] = Fplist_get (sound, QCdata);
 306   attrs[SOUND_DEVICE] = Fplist_get (sound, QCdevice);
 307   attrs[SOUND_VOLUME] = Fplist_get (sound, QCvolume);
 308
 309   /* File name or data must be specified.  */
 310   if (!STRINGP (attrs[SOUND_FILE])
 311       && !STRINGP (attrs[SOUND_DATA]))
 312     return 0;
 313
 314   /* Volume must be in the range 0..100 or unspecified.  */
 315   if (!NILP (attrs[SOUND_VOLUME]))
 316     {
 317       if (INTEGERP (attrs[SOUND_VOLUME]))
 318         {
 319           if (XINT (attrs[SOUND_VOLUME]) < 0
 320               || XINT (attrs[SOUND_VOLUME]) > 100)
 321             return 0;
 322         }
 323       else if (FLOATP (attrs[SOUND_VOLUME]))
 324         {
 325           if (XFLOAT_DATA (attrs[SOUND_VOLUME]) < 0
 326               || XFLOAT_DATA (attrs[SOUND_VOLUME]) > 1)
 327             return 0;
 328         }
 329       else
 330         return 0;
 331     }
 332
 333   /* Device must be a string or unspecified.  */
 334   if (!NILP (attrs[SOUND_DEVICE])
 335       && !STRINGP (attrs[SOUND_DEVICE]))
 336     return 0;
 337
 338   return 1;
 339 }
 340
 341
 342 /* Find out the type of the sound file whose file descriptor is FD.
 343    S is the sound file structure to fill in.  */
 344
 345 static void
 346 find_sound_type (s)
 347      struct sound *s;
 348 {
 349   if (!wav_init (s) && !au_init (s))
 350     error ("Unknown sound format");
 351 }
 352
 353
 354 /* Function installed by play-sound with record_unwind_protect.  */
 355
 356 static Lisp_Object
 357 sound_cleanup (arg)
 358      Lisp_Object arg;
 359 {
 360   if (current_sound_device)
 361     {
 362       if (current_sound_device->close)
 363         current_sound_device->close (current_sound_device);
 364       if (current_sound->fd > 0)
 365         emacs_close (current_sound->fd);
 366     }
 367
 368   return Qnil;
 369 }
 370
 371
 372 DEFUN ("play-sound", Fplay_sound, Splay_sound, 1, 1, 0,
 373   "Play sound SOUND.\n\
 374 SOUND is a list of the form `(sound KEYWORD VALUE...)'.\n\
 375 The following keywords are recognized:\n\
 376 \n\
 377   :file FILE.- read sound data from FILE.  If FILE isn't an\n\
 378 absolute file name, it is searched in `data-directory'.\n\
 379 \n\
 380   :data DATA - read sound data from string DATA.\n\
 381 \n\
 382 Exactly one of :file or :data must be present.\n\
 383 \n\
 384   :volume VOL - set volume to VOL.  VOL must an integer in the\n\
 385 range 0..100 or a float in the range 0..1.0.  If not specified,\n\
 386 don't change the volume setting of the sound device.\n\
 387 \n\
 388   :device DEVICE - play sound on DEVICE.  If not specified,\n\
 389 a system-dependent default device name is used.")
 390   (sound)
 391      Lisp_Object sound;
 392 {
 393   Lisp_Object attrs[SOUND_ATTR_SENTINEL];
 394   Lisp_Object file;
 395   struct gcpro gcpro1, gcpro2;
 396   struct sound_device sd;
 397   struct sound s;
 398   Lisp_Object args[2];
 399   int count = specpdl_ptr - specpdl;
 400
 401   file = Qnil;
 402   GCPRO2 (sound, file);
 403   bzero (&sd, sizeof sd);
 404   bzero (&s, sizeof s);
 405   current_sound_device = &sd;
 406   current_sound = &s;
 407   record_unwind_protect (sound_cleanup, Qnil);
 408   s.header = (char *) alloca (MAX_SOUND_HEADER_BYTES);
 409
 410   /* Parse the sound specification.  Give up if it is invalid.  */
 411   if (!parse_sound (sound, attrs))
 412     error ("Invalid sound specification");
 413
 414   if (STRINGP (attrs[SOUND_FILE]))
 415     {
 416       /* Open the sound file.  */
 417       s.fd = openp (Fcons (Vdata_directory, Qnil),
 418                     attrs[SOUND_FILE], Qnil, &file, 0);
 419       if (s.fd < 0)
 420         sound_perror ("Open sound file");
 421
 422       /* Read the first bytes from the file.  */
 423       s.header_size = emacs_read (s.fd, s.header, MAX_SOUND_HEADER_BYTES);
 424       if (s.header_size < 0)
 425         sound_perror ("Reading sound file header");
 426     }
 427   else
 428     {
 429       s.data = attrs[SOUND_DATA];
 430       bcopy (XSTRING (s.data)->data, s.header,
 431              min (MAX_SOUND_HEADER_BYTES, STRING_BYTES (XSTRING (s.data))));
 432     }
 433
 434   /* Find out the type of sound.  Give up if we can't tell.  */
 435   find_sound_type (&s);
 436
 437   /* Set up a device.  */
 438   if (STRINGP (attrs[SOUND_DEVICE]))
 439     {
 440       int len = XSTRING (attrs[SOUND_DEVICE])->size;
 441       sd.file = (char *) alloca (len + 1);
 442       strcpy (sd.file, XSTRING (attrs[SOUND_DEVICE])->data);
 443     }
 444
 445   if (INTEGERP (attrs[SOUND_VOLUME]))
 446     sd.volume = XFASTINT (attrs[SOUND_VOLUME]);
 447   else if (FLOATP (attrs[SOUND_VOLUME]))
 448     sd.volume = XFLOAT_DATA (attrs[SOUND_VOLUME]) * 100;
 449
 450   args[0] = Qplay_sound_functions;
 451   args[1] = sound;
 452   Frun_hook_with_args (2, args);
 453
 454   /* There is only one type of device we currently support, the VOX
 455      sound driver.  Set up the device interface functions for that
 456      device.  */
 457   vox_init (&sd);
 458
 459   /* Open the device.  */
 460   sd.open (&sd);
 461
 462   /* Play the sound.  */
 463   s.play (&s, &sd);
 464
 465   /* Close the input file, if any.  */
 466   if (!STRINGP (s.data))
 467     {
 468       emacs_close (s.fd);
 469       s.fd = -1;
 470     }
 471
 472   /* Close the device.  */
 473   sd.close (&sd);
 474
 475   /* Clean up.  */
 476   current_sound_device = NULL;
 477   current_sound = NULL;
 478   UNGCPRO;
 479   unbind_to (count, Qnil);
 480   return Qnil;
 481 }
 482
 483 \f
 484 /***********************************************************************
 485                         Byte-order Conversion
 486  ***********************************************************************/
 487
 488 /* Convert 32-bit value VALUE which is in little-endian byte-order
 489    to host byte-order.  */
 490
 491 static u_int32_t
 492 le2hl (value)
 493      u_int32_t value;
 494 {
 495 #ifdef WORDS_BIG_ENDIAN
 496   unsigned char *p = (unsigned char *) &value;
 497   value = p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
 498 #endif
 499   return value;
 500 }
 501
 502
 503 /* Convert 16-bit value VALUE which is in little-endian byte-order
 504    to host byte-order.  */
 505
 506 static u_int16_t
 507 le2hs (value)
 508      u_int16_t value;
 509 {
 510 #ifdef WORDS_BIG_ENDIAN
 511   unsigned char *p = (unsigned char *) &value;
 512   value = p[0] + (p[1] << 8);
 513 #endif
 514   return value;
 515 }
 516
 517
 518 /* Convert 32-bit value VALUE which is in big-endian byte-order
 519    to host byte-order.  */
 520
 521 static u_int32_t
 522 be2hl (value)
 523      u_int32_t value;
 524 {
 525 #ifndef WORDS_BIG_ENDIAN
 526   unsigned char *p = (unsigned char *) &value;
 527   value = p[3] + (p[2] << 8) + (p[1] << 16) + (p[0] << 24);
 528 #endif
 529   return value;
 530 }
 531
 532
 533 #if 0 /* Currently not used.  */
 534
 535 /* Convert 16-bit value VALUE which is in big-endian byte-order
 536    to host byte-order.  */
 537
 538 static u_int16_t
 539 be2hs (value)
 540      u_int16_t value;
 541 {
 542 #ifndef WORDS_BIG_ENDIAN
 543   unsigned char *p = (unsigned char *) &value;
 544   value = p[1] + (p[0] << 8);
 545 #endif
 546   return value;
 547 }
 548
 549 #endif /* 0 */
 550
 551 \f
 552 /***********************************************************************
 553                           RIFF-WAVE (*.wav)
 554  ***********************************************************************/
 555
 556 /* Try to initialize sound file S from S->header.  S->header
 557    contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
 558    sound file.  If the file is a WAV-format file, set up interface
 559    functions in S and convert header fields to host byte-order.
 560    Value is non-zero if the file is a WAV file.  */
 561
 562 static int
 563 wav_init (s)
 564      struct sound *s;
 565 {
 566   struct wav_header *header = (struct wav_header *) s->header;
 567
 568   if (s->header_size < sizeof *header
 569       || bcmp (s->header, "RIFF", 4) != 0)
 570     return 0;
 571
 572   /* WAV files are in little-endian order.  Convert the header
 573      if on a big-endian machine.  */
 574   header->magic = le2hl (header->magic);
 575   header->length = le2hl (header->length);
 576   header->chunk_type = le2hl (header->chunk_type);
 577   header->chunk_format = le2hl (header->chunk_format);
 578   header->chunk_length = le2hl (header->chunk_length);
 579   header->format = le2hs (header->format);
 580   header->channels = le2hs (header->channels);
 581   header->sample_rate = le2hl (header->sample_rate);
 582   header->bytes_per_second = le2hl (header->bytes_per_second);
 583   header->sample_size = le2hs (header->sample_size);
 584   header->precision = le2hs (header->precision);
 585   header->chunk_data = le2hl (header->chunk_data);
 586   header->data_length = le2hl (header->data_length);
 587
 588   /* Set up the interface functions for WAV.  */
 589   s->type = RIFF;
 590   s->play = wav_play;
 591
 592   return 1;
 593 }
 594
 595
 596 /* Play RIFF-WAVE audio file S on sound device SD.  */
 597
 598 static void
 599 wav_play (s, sd)
 600      struct sound *s;
 601      struct sound_device *sd;
 602 {
 603   struct wav_header *header = (struct wav_header *) s->header;
 604
 605   /* Let the device choose a suitable device-dependent format
 606      for the file.  */
 607   sd->choose_format (sd, s);
 608
 609   /* Configure the device.  */
 610   sd->sample_size = header->sample_size;
 611   sd->sample_rate = header->sample_rate;
 612   sd->bps = header->bytes_per_second;
 613   sd->channels = header->channels;
 614   sd->configure (sd);
 615
 616   /* Copy sound data to the device.  The WAV file specification is
 617      actually more complex.  This simple scheme worked with all WAV
 618      files I found so far.  If someone feels inclined to implement the
 619      whole RIFF-WAVE spec, please do.  */
 620   if (STRINGP (s->data))
 621     sd->write (sd, XSTRING (s->data)->data + sizeof *header,
 622                STRING_BYTES (XSTRING (s->data)) - sizeof *header);
 623   else
 624     {
 625       char *buffer;
 626       int nbytes;
 627       int blksize = 2048;
 628
 629       buffer = (char *) alloca (blksize);
 630       lseek (s->fd, sizeof *header, SEEK_SET);
 631
 632       while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
 633         sd->write (sd, buffer, nbytes);
 634
 635       if (nbytes < 0)
 636         sound_perror ("Reading sound file");
 637     }
 638 }
 639
 640
 641 \f
 642 /***********************************************************************
 643                            Sun Audio (*.au)
 644  ***********************************************************************/
 645
 646 /* Sun audio file encodings.  */
 647
 648 enum au_encoding
 649 {
 650   AU_ENCODING_ULAW_8 = 1,
 651   AU_ENCODING_8,
 652   AU_ENCODING_16,
 653   AU_ENCODING_24,
 654   AU_ENCODING_32,
 655   AU_ENCODING_IEEE32,
 656   AU_ENCODING_IEEE64,
 657   AU_COMPRESSED = 23
 658 };
 659
 660
 661 /* Try to initialize sound file S from S->header.  S->header
 662    contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
 663    sound file.  If the file is a AU-format file, set up interface
 664    functions in S and convert header fields to host byte-order.
 665    Value is non-zero if the file is an AU file.  */
 666
 667 static int
 668 au_init (s)
 669      struct sound *s;
 670 {
 671   struct au_header *header = (struct au_header *) s->header;
 672
 673   if (s->header_size < sizeof *header
 674       || bcmp (s->header, ".snd", 4) != 0)
 675     return 0;
 676
 677   header->magic_number = be2hl (header->magic_number);
 678   header->data_offset = be2hl (header->data_offset);
 679   header->data_size = be2hl (header->data_size);
 680   header->encoding = be2hl (header->encoding);
 681   header->sample_rate = be2hl (header->sample_rate);
 682   header->channels = be2hl (header->channels);
 683
 684   /* Set up the interface functions for AU.  */
 685   s->type = SUN_AUDIO;
 686   s->play = au_play;
 687
 688   return 1;
 689 }
 690
 691
 692 /* Play Sun audio file S on sound device SD.  */
 693
 694 static void
 695 au_play (s, sd)
 696      struct sound *s;
 697      struct sound_device *sd;
 698 {
 699   struct au_header *header = (struct au_header *) s->header;
 700
 701   sd->sample_size = 0;
 702   sd->sample_rate = header->sample_rate;
 703   sd->bps = 0;
 704   sd->channels = header->channels;
 705   sd->choose_format (sd, s);
 706   sd->configure (sd);
 707
 708   if (STRINGP (s->data))
 709     sd->write (sd, XSTRING (s->data)->data + header->data_offset,
 710                STRING_BYTES (XSTRING (s->data)) - header->data_offset);
 711   else
 712     {
 713       int blksize = 2048;
 714       char *buffer;
 715       int nbytes;
 716
 717       /* Seek */
 718       lseek (s->fd, header->data_offset, SEEK_SET);
 719
 720       /* Copy sound data to the device.  */
 721       buffer = (char *) alloca (blksize);
 722       while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
 723         sd->write (sd, buffer, nbytes);
 724
 725       if (nbytes < 0)
 726         sound_perror ("Reading sound file");
 727     }
 728 }
 729
 730
 731 \f
 732 /***********************************************************************
 733                        Voxware Driver Interface
 734  ***********************************************************************/
 735
 736 /* This driver is available on GNU/Linux, and the free BSDs.  FreeBSD
 737    has a compatible own driver aka Luigi's driver.  */
 738
 739
 740 /* Open device SD.  If SD->file is non-null, open that device,
 741    otherwise use a default device name.  */
 742
 743 static void
 744 vox_open (sd)
 745      struct sound_device *sd;
 746 {
 747   char *file;
 748
 749   /* Open the sound device.  Default is /dev/dsp.  */
 750   if (sd->file)
 751     file = sd->file;
 752   else
 753     file = DEFAULT_SOUND_DEVICE;
 754
 755   sd->fd = emacs_open (file, O_WRONLY, 0);
 756   if (sd->fd < 0)
 757     sound_perror (file);
 758 }
 759
 760
 761 /* Configure device SD from parameters in it.  */
 762
 763 static void
 764 vox_configure (sd)
 765      struct sound_device *sd;
 766 {
 767   int val;
 768
 769   xassert (sd->fd >= 0);
 770
 771   /* On GNU/Linux, it seems that the device driver doesn't like to be
 772      interrupted by a signal.  Block the ones we know to cause
 773      troubles.  */
 774   turn_on_atimers (0);
 775 #ifdef SIGIO
 776   sigblock (sigmask (SIGIO));
 777 #endif
 778
 779   val = sd->format;
 780   if (ioctl (sd->fd, SNDCTL_DSP_SETFMT, &sd->format) < 0
 781       || val != sd->format)
 782     sound_perror ("Set sound format");
 783
 784   val = sd->channels != 1;
 785   if (ioctl (sd->fd, SNDCTL_DSP_STEREO, &val) < 0
 786       || val != (sd->channels != 1))
 787     sound_perror ("Set stereo/mono");
 788
 789   /* I think bps and sampling_rate are the same, but who knows.
 790      Check this. and use SND_DSP_SPEED for both.  */
 791   if (sd->sample_rate > 0)
 792     {
 793       val = sd->sample_rate;
 794       if (ioctl (sd->fd, SNDCTL_DSP_SPEED, &sd->sample_rate) < 0
 795           || val != sd->sample_rate)
 796         sound_perror ("Set sound speed");
 797     }
 798
 799   if (sd->volume > 0)
 800     {
 801       int volume = sd->volume & 0xff;
 802       volume |= volume << 8;
 803       /* This may fail if there is no mixer.  Ignore the failure.  */
 804       ioctl (sd->fd, SOUND_MIXER_WRITE_PCM, &volume);
 805     }
 806
 807   turn_on_atimers (1);
 808 #ifdef SIGIO
 809   sigunblock (sigmask (SIGIO));
 810 #endif
 811 }
 812
 813
 814 /* Close device SD if it is open.  */
 815
 816 static void
 817 vox_close (sd)
 818      struct sound_device *sd;
 819 {
 820   if (sd->fd >= 0)
 821     {
 822       /* On GNU/Linux, it seems that the device driver doesn't like to
 823          be interrupted by a signal.  Block the ones we know to cause
 824          troubles.  */
 825 #ifdef SIGIO
 826       sigblock (sigmask (SIGIO));
 827 #endif
 828       turn_on_atimers (0);
 829
 830       /* Flush sound data, and reset the device.  */
 831       ioctl (sd->fd, SNDCTL_DSP_SYNC, NULL);
 832
 833       turn_on_atimers (1);
 834 #ifdef SIGIO
 835       sigunblock (sigmask (SIGIO));
 836 #endif
 837
 838       /* Close the device.  */
 839       emacs_close (sd->fd);
 840       sd->fd = -1;
 841     }
 842 }
 843
 844
 845 /* Choose device-dependent format for device SD from sound file S.  */
 846
 847 static void
 848 vox_choose_format (sd, s)
 849      struct sound_device *sd;
 850      struct sound *s;
 851 {
 852   if (s->type == RIFF)
 853     {
 854       struct wav_header *h = (struct wav_header *) s->header;
 855       if (h->precision == 8)
 856         sd->format = AFMT_U8;
 857       else if (h->precision == 16)
 858         sd->format = AFMT_S16_LE;
 859       else
 860         error ("Unsupported WAV file format");
 861     }
 862   else if (s->type == SUN_AUDIO)
 863     {
 864       struct au_header *header = (struct au_header *) s->header;
 865       switch (header->encoding)
 866         {
 867         case AU_ENCODING_ULAW_8:
 868         case AU_ENCODING_IEEE32:
 869         case AU_ENCODING_IEEE64:
 870           sd->format = AFMT_MU_LAW;
 871           break;
 872
 873         case AU_ENCODING_8:
 874         case AU_ENCODING_16:
 875         case AU_ENCODING_24:
 876         case AU_ENCODING_32:
 877           sd->format = AFMT_S16_LE;
 878           break;
 879
 880         default:
 881           error ("Unsupported AU file format");
 882         }
 883     }
 884   else
 885     abort ();
 886 }
 887
 888
 889 /* Initialize device SD.  Set up the interface functions in the device
 890    structure.  */
 891
 892 static void
 893 vox_init (sd)
 894      struct sound_device *sd;
 895 {
 896   sd->fd = -1;
 897   sd->open = vox_open;
 898   sd->close = vox_close;
 899   sd->configure = vox_configure;
 900   sd->choose_format = vox_choose_format;
 901   sd->write = vox_write;
 902 }
 903
 904
 905 /* Write NBYTES bytes from BUFFER to device SD.  */
 906
 907 static void
 908 vox_write (sd, buffer, nbytes)
 909      struct sound_device *sd;
 910      char *buffer;
 911      int nbytes;
 912 {
 913   int nwritten = emacs_write (sd->fd, buffer, nbytes);
 914   if (nwritten < 0)
 915     sound_perror ("Writing to sound device");
 916 }
 917
 918
 919 \f
 920 /***********************************************************************
 921                             Initialization
 922  ***********************************************************************/
 923
 924 void
 925 syms_of_sound ()
 926 {
 927   QCdevice = intern (":device");
 928   staticpro (&QCdevice);
 929   QCvolume = intern (":volume");
 930   staticpro (&QCvolume);
 931   Qsound = intern ("sound");
 932   staticpro (&Qsound);
 933   Qplay_sound_functions = intern ("play-sound-functions");
 934   staticpro (&Qplay_sound_functions);
 935
 936   defsubr (&Splay_sound);
 937 }
 938
 939
 940 void
 941 init_sound ()
 942 {
 943 }
 944
 945 #endif /* HAVE_SOUND */