code.delx.au - gnu-emacs/blob - src/sound.c

   1 /* sound.c -- sound support.
   2    Copyright (C) 1998, 1999, 2001, 2002, 2003, 2004,
   3                  2005, 2006 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* Written by Gerd Moellmann <gerd@gnu.org>.  Tested with Luigi's
  23    driver on FreeBSD 2.2.7 with a SoundBlaster 16.  */
  24
  25 /*
  26   Modified by Ben Key <Bkey1@tampabay.rr.com> to add a partial
  27   implementation of the play-sound specification for Windows.
  28
  29   Notes:
  30   In the Windows implementation of play-sound-internal only the
  31   :file and :volume keywords are supported.  The :device keyword,
  32   if present, is ignored.  The :data keyword, if present, will
  33   cause an error to be generated.
  34
  35   The Windows implementation of play-sound is implemented via the
  36   Win32 API functions mciSendString, waveOutGetVolume, and
  37   waveOutSetVolume which are exported by Winmm.dll.
  38 */
  39
  40 #include <config.h>
  41
  42 #if defined HAVE_SOUND
  43
  44 /* BEGIN: Common Includes */
  45 #include <fcntl.h>
  46 #include <unistd.h>
  47 #include <sys/types.h>
  48 #include <errno.h>
  49 #include "lisp.h"
  50 #include "dispextern.h"
  51 #include "atimer.h"
  52 #include <signal.h>
  53 #include "syssignal.h"
  54 /* END: Common Includes */
  55
  56
  57 /* BEGIN: Non Windows Includes */
  58 #ifndef WINDOWSNT
  59
  60 #ifndef MSDOS
  61 #include <sys/ioctl.h>
  62 #endif
  63
  64 /* FreeBSD has machine/soundcard.h.  Voxware sound driver docs mention
  65    sys/soundcard.h.  So, let's try whatever's there.  */
  66
  67 #ifdef HAVE_MACHINE_SOUNDCARD_H
  68 #include <machine/soundcard.h>
  69 #endif
  70 #ifdef HAVE_SYS_SOUNDCARD_H
  71 #include <sys/soundcard.h>
  72 #endif
  73 #ifdef HAVE_SOUNDCARD_H
  74 #include <soundcard.h>
  75 #endif
  76 /* END: Non Windows Includes */
  77
  78 #else /* WINDOWSNT */
  79
  80 /* BEGIN: Windows Specific Includes */
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <limits.h>
  85 #include <windows.h>
  86 #include <mmsystem.h>
  87 /* END: Windows Specific Includes */
  88
  89 #endif /* WINDOWSNT */
  90
  91 /* BEGIN: Common Definitions */
  92 #define abs(X)    ((X) < 0 ? -(X) : (X))
  93
  94 /* Symbols.  */
  95
  96 extern Lisp_Object QCfile, QCdata;
  97 Lisp_Object QCvolume, QCdevice;
  98 Lisp_Object Qsound;
  99 Lisp_Object Qplay_sound_functions;
 100
 101 /* Indices of attributes in a sound attributes vector.  */
 102
 103 enum sound_attr
 104 {
 105   SOUND_FILE,
 106   SOUND_DATA,
 107   SOUND_DEVICE,
 108   SOUND_VOLUME,
 109   SOUND_ATTR_SENTINEL
 110 };
 111
 112 static void sound_perror P_ ((char *));
 113 static void sound_warning P_ ((char *));
 114 static int parse_sound P_ ((Lisp_Object, Lisp_Object *));
 115
 116 /* END: Common Definitions */
 117
 118 /* BEGIN: Non Windows Definitions */
 119 #ifndef WINDOWSNT
 120
 121 #ifndef DEFAULT_SOUND_DEVICE
 122 #define DEFAULT_SOUND_DEVICE "/dev/dsp"
 123 #endif
 124
 125
 126 /* Structure forward declarations.  */
 127
 128 struct sound;
 129 struct sound_device;
 130
 131 /* The file header of RIFF-WAVE files (*.wav).  Files are always in
 132    little-endian byte-order.  */
 133
 134 struct wav_header
 135 {
 136   u_int32_t magic;
 137   u_int32_t length;
 138   u_int32_t chunk_type;
 139   u_int32_t chunk_format;
 140   u_int32_t chunk_length;
 141   u_int16_t format;
 142   u_int16_t channels;
 143   u_int32_t sample_rate;
 144   u_int32_t bytes_per_second;
 145   u_int16_t sample_size;
 146   u_int16_t precision;
 147   u_int32_t chunk_data;
 148   u_int32_t data_length;
 149 };
 150
 151 /* The file header of Sun adio files (*.au).  Files are always in
 152    big-endian byte-order.  */
 153
 154 struct au_header
 155 {
 156   /* ASCII ".snd" */
 157   u_int32_t magic_number;
 158
 159   /* Offset of data part from start of file. Minimum value is 24.  */
 160   u_int32_t data_offset;
 161
 162   /* Size of data part, 0xffffffff if unknown.  */
 163   u_int32_t data_size;
 164
 165   /* Data encoding format.
 166      1  8-bit ISDN u-law
 167      2  8-bit linear PCM (REF-PCM)
 168      3  16-bit linear PCM
 169      4  24-bit linear PCM
 170      5  32-bit linear PCM
 171      6  32-bit IEEE floating-point
 172      7  64-bit IEEE floating-point
 173      23 8-bit u-law compressed using CCITT 0.721 ADPCM voice data
 174      encoding scheme.  */
 175   u_int32_t encoding;
 176
 177   /* Number of samples per second.  */
 178   u_int32_t sample_rate;
 179
 180   /* Number of interleaved channels.  */
 181   u_int32_t channels;
 182 };
 183
 184 /* Maximum of all sound file headers sizes.  */
 185
 186 #define MAX_SOUND_HEADER_BYTES \
 187      max (sizeof (struct wav_header), sizeof (struct au_header))
 188
 189 /* Interface structure for sound devices.  */
 190
 191 struct sound_device
 192 {
 193   /* The name of the device or null meaning use a default device name.  */
 194   char *file;
 195
 196   /* File descriptor of the device.  */
 197   int fd;
 198
 199   /* Device-dependent format.  */
 200   int format;
 201
 202   /* Volume (0..100).  Zero means unspecified.  */
 203   int volume;
 204
 205   /* Sample size.  */
 206   int sample_size;
 207
 208   /* Sample rate.  */
 209   int sample_rate;
 210
 211   /* Bytes per second.  */
 212   int bps;
 213
 214   /* 1 = mono, 2 = stereo, 0 = don't set.  */
 215   int channels;
 216
 217   /* Open device SD.  */
 218   void (* open) P_ ((struct sound_device *sd));
 219
 220   /* Close device SD.  */
 221   void (* close) P_ ((struct sound_device *sd));
 222
 223   /* Configure SD accoring to device-dependent parameters.  */
 224   void (* configure) P_ ((struct sound_device *device));
 225
 226   /* Choose a device-dependent format for outputting sound S.  */
 227   void (* choose_format) P_ ((struct sound_device *sd,
 228                               struct sound *s));
 229
 230   /* Write NYBTES bytes from BUFFER to device SD.  */
 231   void (* write) P_ ((struct sound_device *sd, const char *buffer,
 232                       int nbytes));
 233
 234   /* A place for devices to store additional data.  */
 235   void *data;
 236 };
 237
 238 /* An enumerator for each supported sound file type.  */
 239
 240 enum sound_type
 241 {
 242   RIFF,
 243   SUN_AUDIO
 244 };
 245
 246 /* Interface structure for sound files.  */
 247
 248 struct sound
 249 {
 250   /* The type of the file.  */
 251   enum sound_type type;
 252
 253   /* File descriptor of a sound file.  */
 254   int fd;
 255
 256   /* Pointer to sound file header.  This contains header_size bytes
 257      read from the start of a sound file.  */
 258   char *header;
 259
 260   /* Number of bytes raed from sound file.  This is always <=
 261      MAX_SOUND_HEADER_BYTES.  */
 262   int header_size;
 263
 264   /* Sound data, if a string.  */
 265   Lisp_Object data;
 266
 267   /* Play sound file S on device SD.  */
 268   void (* play) P_ ((struct sound *s, struct sound_device *sd));
 269 };
 270
 271 /* These are set during `play-sound-internal' so that sound_cleanup has
 272    access to them.  */
 273
 274 struct sound_device *current_sound_device;
 275 struct sound *current_sound;
 276
 277 /* Function prototypes.  */
 278
 279 static void vox_open P_ ((struct sound_device *));
 280 static void vox_configure P_ ((struct sound_device *));
 281 static void vox_close P_ ((struct sound_device *sd));
 282 static void vox_choose_format P_ ((struct sound_device *, struct sound *));
 283 static void vox_init P_ ((struct sound_device *));
 284 static void vox_write P_ ((struct sound_device *, const char *, int));
 285 static void find_sound_type P_ ((struct sound *));
 286 static u_int32_t le2hl P_ ((u_int32_t));
 287 static u_int16_t le2hs P_ ((u_int16_t));
 288 static u_int32_t be2hl P_ ((u_int32_t));
 289 static int wav_init P_ ((struct sound *));
 290 static void wav_play P_ ((struct sound *, struct sound_device *));
 291 static int au_init P_ ((struct sound *));
 292 static void au_play P_ ((struct sound *, struct sound_device *));
 293
 294 #if 0 /* Currently not used.  */
 295 static u_int16_t be2hs P_ ((u_int16_t));
 296 #endif
 297
 298 /* END: Non Windows Definitions */
 299 #else /* WINDOWSNT */
 300
 301 /* BEGIN: Windows Specific Definitions */
 302 static int do_play_sound P_ ((const char *, unsigned long));
 303 /*
 304   END: Windows Specific Definitions */
 305 #endif /* WINDOWSNT */
 306
 307 \f
 308 /***********************************************************************
 309                                General
 310  ***********************************************************************/
 311
 312 /* BEGIN: Common functions */
 313
 314 /* Like perror, but signals an error.  */
 315
 316 static void
 317 sound_perror (msg)
 318      char *msg;
 319 {
 320   int saved_errno = errno;
 321
 322   turn_on_atimers (1);
 323 #ifdef SIGIO
 324   sigunblock (sigmask (SIGIO));
 325 #endif
 326   if (saved_errno != 0)
 327     error ("%s: %s", msg, strerror (saved_errno));
 328   else
 329     error ("%s", msg);
 330 }
 331
 332
 333 /* Display a warning message.  */
 334
 335 static void
 336 sound_warning (msg)
 337      char *msg;
 338 {
 339   message (msg);
 340 }
 341
 342
 343 /* Parse sound specification SOUND, and fill ATTRS with what is
 344    found.  Value is non-zero if SOUND Is a valid sound specification.
 345    A valid sound specification is a list starting with the symbol
 346    `sound'.  The rest of the list is a property list which may
 347    contain the following key/value pairs:
 348
 349    - `:file FILE'
 350
 351    FILE is the sound file to play.  If it isn't an absolute name,
 352    it's searched under `data-directory'.
 353
 354    - `:data DATA'
 355
 356    DATA is a string containing sound data.  Either :file or :data
 357    may be present, but not both.
 358
 359    - `:device DEVICE'
 360
 361    DEVICE is the name of the device to play on, e.g. "/dev/dsp2".
 362    If not specified, a default device is used.
 363
 364    - `:volume VOL'
 365
 366    VOL must be an integer in the range [0, 100], or a float in the
 367    range [0, 1].  */
 368
 369 static int
 370 parse_sound (sound, attrs)
 371      Lisp_Object sound;
 372      Lisp_Object *attrs;
 373 {
 374   /* SOUND must be a list starting with the symbol `sound'.  */
 375   if (!CONSP (sound) || !EQ (XCAR (sound), Qsound))
 376     return 0;
 377
 378   sound = XCDR (sound);
 379   attrs[SOUND_FILE] = Fplist_get (sound, QCfile);
 380   attrs[SOUND_DATA] = Fplist_get (sound, QCdata);
 381   attrs[SOUND_DEVICE] = Fplist_get (sound, QCdevice);
 382   attrs[SOUND_VOLUME] = Fplist_get (sound, QCvolume);
 383
 384 #ifndef WINDOWSNT
 385   /* File name or data must be specified.  */
 386   if (!STRINGP (attrs[SOUND_FILE])
 387       && !STRINGP (attrs[SOUND_DATA]))
 388     return 0;
 389 #else /* WINDOWSNT */
 390   /*
 391     Data is not supported in Windows.  Therefore a
 392     File name MUST be supplied.
 393   */
 394   if (!STRINGP (attrs[SOUND_FILE]))
 395     {
 396       return 0;
 397     }
 398 #endif /* WINDOWSNT */
 399
 400   /* Volume must be in the range 0..100 or unspecified.  */
 401   if (!NILP (attrs[SOUND_VOLUME]))
 402     {
 403       if (INTEGERP (attrs[SOUND_VOLUME]))
 404         {
 405           if (XINT (attrs[SOUND_VOLUME]) < 0
 406               || XINT (attrs[SOUND_VOLUME]) > 100)
 407             return 0;
 408         }
 409       else if (FLOATP (attrs[SOUND_VOLUME]))
 410         {
 411           if (XFLOAT_DATA (attrs[SOUND_VOLUME]) < 0
 412               || XFLOAT_DATA (attrs[SOUND_VOLUME]) > 1)
 413             return 0;
 414         }
 415       else
 416         return 0;
 417     }
 418
 419 #ifndef WINDOWSNT
 420   /* Device must be a string or unspecified.  */
 421   if (!NILP (attrs[SOUND_DEVICE])
 422       && !STRINGP (attrs[SOUND_DEVICE]))
 423     return 0;
 424 #endif  /* WINDOWSNT */
 425   /*
 426     Since device is ignored in Windows, it does not matter
 427     what it is.
 428    */
 429   return 1;
 430 }
 431
 432 /* END: Common functions */
 433
 434 /* BEGIN: Non Windows functions */
 435 #ifndef WINDOWSNT
 436
 437 /* Find out the type of the sound file whose file descriptor is FD.
 438    S is the sound file structure to fill in.  */
 439
 440 static void
 441 find_sound_type (s)
 442      struct sound *s;
 443 {
 444   if (!wav_init (s) && !au_init (s))
 445     error ("Unknown sound format");
 446 }
 447
 448
 449 /* Function installed by play-sound-internal with record_unwind_protect.  */
 450
 451 static Lisp_Object
 452 sound_cleanup (arg)
 453      Lisp_Object arg;
 454 {
 455   if (current_sound_device->close)
 456     current_sound_device->close (current_sound_device);
 457   if (current_sound->fd > 0)
 458     emacs_close (current_sound->fd);
 459   free (current_sound_device);
 460   free (current_sound);
 461
 462   return Qnil;
 463 }
 464
 465 /***********************************************************************
 466                         Byte-order Conversion
 467  ***********************************************************************/
 468
 469 /* Convert 32-bit value VALUE which is in little-endian byte-order
 470    to host byte-order.  */
 471
 472 static u_int32_t
 473 le2hl (value)
 474      u_int32_t value;
 475 {
 476 #ifdef WORDS_BIG_ENDIAN
 477   unsigned char *p = (unsigned char *) &value;
 478   value = p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
 479 #endif
 480   return value;
 481 }
 482
 483
 484 /* Convert 16-bit value VALUE which is in little-endian byte-order
 485    to host byte-order.  */
 486
 487 static u_int16_t
 488 le2hs (value)
 489      u_int16_t value;
 490 {
 491 #ifdef WORDS_BIG_ENDIAN
 492   unsigned char *p = (unsigned char *) &value;
 493   value = p[0] + (p[1] << 8);
 494 #endif
 495   return value;
 496 }
 497
 498
 499 /* Convert 32-bit value VALUE which is in big-endian byte-order
 500    to host byte-order.  */
 501
 502 static u_int32_t
 503 be2hl (value)
 504      u_int32_t value;
 505 {
 506 #ifndef WORDS_BIG_ENDIAN
 507   unsigned char *p = (unsigned char *) &value;
 508   value = p[3] + (p[2] << 8) + (p[1] << 16) + (p[0] << 24);
 509 #endif
 510   return value;
 511 }
 512
 513
 514 #if 0 /* Currently not used.  */
 515
 516 /* Convert 16-bit value VALUE which is in big-endian byte-order
 517    to host byte-order.  */
 518
 519 static u_int16_t
 520 be2hs (value)
 521      u_int16_t value;
 522 {
 523 #ifndef WORDS_BIG_ENDIAN
 524   unsigned char *p = (unsigned char *) &value;
 525   value = p[1] + (p[0] << 8);
 526 #endif
 527   return value;
 528 }
 529
 530 #endif /* 0 */
 531
 532 /***********************************************************************
 533                           RIFF-WAVE (*.wav)
 534  ***********************************************************************/
 535
 536 /* Try to initialize sound file S from S->header.  S->header
 537    contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
 538    sound file.  If the file is a WAV-format file, set up interface
 539    functions in S and convert header fields to host byte-order.
 540    Value is non-zero if the file is a WAV file.  */
 541
 542 static int
 543 wav_init (s)
 544      struct sound *s;
 545 {
 546   struct wav_header *header = (struct wav_header *) s->header;
 547
 548   if (s->header_size < sizeof *header
 549       || bcmp (s->header, "RIFF", 4) != 0)
 550     return 0;
 551
 552   /* WAV files are in little-endian order.  Convert the header
 553      if on a big-endian machine.  */
 554   header->magic = le2hl (header->magic);
 555   header->length = le2hl (header->length);
 556   header->chunk_type = le2hl (header->chunk_type);
 557   header->chunk_format = le2hl (header->chunk_format);
 558   header->chunk_length = le2hl (header->chunk_length);
 559   header->format = le2hs (header->format);
 560   header->channels = le2hs (header->channels);
 561   header->sample_rate = le2hl (header->sample_rate);
 562   header->bytes_per_second = le2hl (header->bytes_per_second);
 563   header->sample_size = le2hs (header->sample_size);
 564   header->precision = le2hs (header->precision);
 565   header->chunk_data = le2hl (header->chunk_data);
 566   header->data_length = le2hl (header->data_length);
 567
 568   /* Set up the interface functions for WAV.  */
 569   s->type = RIFF;
 570   s->play = wav_play;
 571
 572   return 1;
 573 }
 574
 575
 576 /* Play RIFF-WAVE audio file S on sound device SD.  */
 577
 578 static void
 579 wav_play (s, sd)
 580      struct sound *s;
 581      struct sound_device *sd;
 582 {
 583   struct wav_header *header = (struct wav_header *) s->header;
 584
 585   /* Let the device choose a suitable device-dependent format
 586      for the file.  */
 587   sd->choose_format (sd, s);
 588
 589   /* Configure the device.  */
 590   sd->sample_size = header->sample_size;
 591   sd->sample_rate = header->sample_rate;
 592   sd->bps = header->bytes_per_second;
 593   sd->channels = header->channels;
 594   sd->configure (sd);
 595
 596   /* Copy sound data to the device.  The WAV file specification is
 597      actually more complex.  This simple scheme worked with all WAV
 598      files I found so far.  If someone feels inclined to implement the
 599      whole RIFF-WAVE spec, please do.  */
 600   if (STRINGP (s->data))
 601     sd->write (sd, SDATA (s->data) + sizeof *header,
 602                SBYTES (s->data) - sizeof *header);
 603   else
 604     {
 605       char *buffer;
 606       int nbytes;
 607       int blksize = 2048;
 608
 609       buffer = (char *) alloca (blksize);
 610       lseek (s->fd, sizeof *header, SEEK_SET);
 611
 612       while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
 613         sd->write (sd, buffer, nbytes);
 614
 615       if (nbytes < 0)
 616         sound_perror ("Error reading sound file");
 617     }
 618 }
 619
 620
 621 /***********************************************************************
 622                            Sun Audio (*.au)
 623  ***********************************************************************/
 624
 625 /* Sun audio file encodings.  */
 626
 627 enum au_encoding
 628 {
 629   AU_ENCODING_ULAW_8 = 1,
 630   AU_ENCODING_8,
 631   AU_ENCODING_16,
 632   AU_ENCODING_24,
 633   AU_ENCODING_32,
 634   AU_ENCODING_IEEE32,
 635   AU_ENCODING_IEEE64,
 636   AU_COMPRESSED = 23
 637 };
 638
 639
 640 /* Try to initialize sound file S from S->header.  S->header
 641    contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
 642    sound file.  If the file is a AU-format file, set up interface
 643    functions in S and convert header fields to host byte-order.
 644    Value is non-zero if the file is an AU file.  */
 645
 646 static int
 647 au_init (s)
 648      struct sound *s;
 649 {
 650   struct au_header *header = (struct au_header *) s->header;
 651
 652   if (s->header_size < sizeof *header
 653       || bcmp (s->header, ".snd", 4) != 0)
 654     return 0;
 655
 656   header->magic_number = be2hl (header->magic_number);
 657   header->data_offset = be2hl (header->data_offset);
 658   header->data_size = be2hl (header->data_size);
 659   header->encoding = be2hl (header->encoding);
 660   header->sample_rate = be2hl (header->sample_rate);
 661   header->channels = be2hl (header->channels);
 662
 663   /* Set up the interface functions for AU.  */
 664   s->type = SUN_AUDIO;
 665   s->play = au_play;
 666
 667   return 1;
 668 }
 669
 670
 671 /* Play Sun audio file S on sound device SD.  */
 672
 673 static void
 674 au_play (s, sd)
 675      struct sound *s;
 676      struct sound_device *sd;
 677 {
 678   struct au_header *header = (struct au_header *) s->header;
 679
 680   sd->sample_size = 0;
 681   sd->sample_rate = header->sample_rate;
 682   sd->bps = 0;
 683   sd->channels = header->channels;
 684   sd->choose_format (sd, s);
 685   sd->configure (sd);
 686
 687   if (STRINGP (s->data))
 688     sd->write (sd, SDATA (s->data) + header->data_offset,
 689                SBYTES (s->data) - header->data_offset);
 690   else
 691     {
 692       int blksize = 2048;
 693       char *buffer;
 694       int nbytes;
 695
 696       /* Seek */
 697       lseek (s->fd, header->data_offset, SEEK_SET);
 698
 699       /* Copy sound data to the device.  */
 700       buffer = (char *) alloca (blksize);
 701       while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
 702         sd->write (sd, buffer, nbytes);
 703
 704       if (nbytes < 0)
 705         sound_perror ("Error reading sound file");
 706     }
 707 }
 708
 709
 710 /***********************************************************************
 711                        Voxware Driver Interface
 712  ***********************************************************************/
 713
 714 /* This driver is available on GNU/Linux, and the free BSDs.  FreeBSD
 715    has a compatible own driver aka Luigi's driver.  */
 716
 717
 718 /* Open device SD.  If SD->file is non-null, open that device,
 719    otherwise use a default device name.  */
 720
 721 static void
 722 vox_open (sd)
 723      struct sound_device *sd;
 724 {
 725   char *file;
 726
 727   /* Open the sound device.  Default is /dev/dsp.  */
 728   if (sd->file)
 729     file = sd->file;
 730   else
 731     file = DEFAULT_SOUND_DEVICE;
 732
 733   sd->fd = emacs_open (file, O_WRONLY, 0);
 734   if (sd->fd < 0)
 735     sound_perror (file);
 736 }
 737
 738
 739 /* Configure device SD from parameters in it.  */
 740
 741 static void
 742 vox_configure (sd)
 743      struct sound_device *sd;
 744 {
 745   int val;
 746
 747   xassert (sd->fd >= 0);
 748
 749   /* On GNU/Linux, it seems that the device driver doesn't like to be
 750      interrupted by a signal.  Block the ones we know to cause
 751      troubles.  */
 752   turn_on_atimers (0);
 753 #ifdef SIGIO
 754   sigblock (sigmask (SIGIO));
 755 #endif
 756
 757   val = sd->format;
 758   if (ioctl (sd->fd, SNDCTL_DSP_SETFMT, &sd->format) < 0
 759       || val != sd->format)
 760     sound_perror ("Could not set sound format");
 761
 762   val = sd->channels != 1;
 763   if (ioctl (sd->fd, SNDCTL_DSP_STEREO, &val) < 0
 764       || val != (sd->channels != 1))
 765     sound_perror ("Could not set stereo/mono");
 766
 767   /* I think bps and sampling_rate are the same, but who knows.
 768      Check this. and use SND_DSP_SPEED for both.  */
 769   if (sd->sample_rate > 0)
 770     {
 771       val = sd->sample_rate;
 772       if (ioctl (sd->fd, SNDCTL_DSP_SPEED, &sd->sample_rate) < 0)
 773         sound_perror ("Could not set sound speed");
 774       else if (val != sd->sample_rate)
 775         sound_warning ("Could not set sample rate");
 776     }
 777
 778   if (sd->volume > 0)
 779     {
 780       int volume = sd->volume & 0xff;
 781       volume |= volume << 8;
 782       /* This may fail if there is no mixer.  Ignore the failure.  */
 783       ioctl (sd->fd, SOUND_MIXER_WRITE_PCM, &volume);
 784     }
 785
 786   turn_on_atimers (1);
 787 #ifdef SIGIO
 788   sigunblock (sigmask (SIGIO));
 789 #endif
 790 }
 791
 792
 793 /* Close device SD if it is open.  */
 794
 795 static void
 796 vox_close (sd)
 797      struct sound_device *sd;
 798 {
 799   if (sd->fd >= 0)
 800     {
 801       /* On GNU/Linux, it seems that the device driver doesn't like to
 802          be interrupted by a signal.  Block the ones we know to cause
 803          troubles.  */
 804 #ifdef SIGIO
 805       sigblock (sigmask (SIGIO));
 806 #endif
 807       turn_on_atimers (0);
 808
 809       /* Flush sound data, and reset the device.  */
 810       ioctl (sd->fd, SNDCTL_DSP_SYNC, NULL);
 811
 812       turn_on_atimers (1);
 813 #ifdef SIGIO
 814       sigunblock (sigmask (SIGIO));
 815 #endif
 816
 817       /* Close the device.  */
 818       emacs_close (sd->fd);
 819       sd->fd = -1;
 820     }
 821 }
 822
 823
 824 /* Choose device-dependent format for device SD from sound file S.  */
 825
 826 static void
 827 vox_choose_format (sd, s)
 828      struct sound_device *sd;
 829      struct sound *s;
 830 {
 831   if (s->type == RIFF)
 832     {
 833       struct wav_header *h = (struct wav_header *) s->header;
 834       if (h->precision == 8)
 835         sd->format = AFMT_U8;
 836       else if (h->precision == 16)
 837         sd->format = AFMT_S16_LE;
 838       else
 839         error ("Unsupported WAV file format");
 840     }
 841   else if (s->type == SUN_AUDIO)
 842     {
 843       struct au_header *header = (struct au_header *) s->header;
 844       switch (header->encoding)
 845         {
 846         case AU_ENCODING_ULAW_8:
 847         case AU_ENCODING_IEEE32:
 848         case AU_ENCODING_IEEE64:
 849           sd->format = AFMT_MU_LAW;
 850           break;
 851
 852         case AU_ENCODING_8:
 853         case AU_ENCODING_16:
 854         case AU_ENCODING_24:
 855         case AU_ENCODING_32:
 856           sd->format = AFMT_S16_LE;
 857           break;
 858
 859         default:
 860           error ("Unsupported AU file format");
 861         }
 862     }
 863   else
 864     abort ();
 865 }
 866
 867
 868 /* Initialize device SD.  Set up the interface functions in the device
 869    structure.  */
 870
 871 static void
 872 vox_init (sd)
 873      struct sound_device *sd;
 874 {
 875   sd->fd = -1;
 876   sd->open = vox_open;
 877   sd->close = vox_close;
 878   sd->configure = vox_configure;
 879   sd->choose_format = vox_choose_format;
 880   sd->write = vox_write;
 881 }
 882
 883 /* Write NBYTES bytes from BUFFER to device SD.  */
 884
 885 static void
 886 vox_write (sd, buffer, nbytes)
 887      struct sound_device *sd;
 888      const char *buffer;
 889      int nbytes;
 890 {
 891   int nwritten = emacs_write (sd->fd, buffer, nbytes);
 892   if (nwritten < 0)
 893     sound_perror ("Error writing to sound device");
 894 }
 895
 896 /* END: Non Windows functions */
 897 #else /* WINDOWSNT */
 898
 899 /* BEGIN: Windows specific functions */
 900
 901 static int
 902 do_play_sound (psz_file, ui_volume)
 903      const char *psz_file;
 904      unsigned long ui_volume;
 905 {
 906   int i_result = 0;
 907   MCIERROR mci_error = 0;
 908   char sz_cmd_buf[520] = {0};
 909   char sz_ret_buf[520] = {0};
 910   MMRESULT mm_result = MMSYSERR_NOERROR;
 911   unsigned long ui_volume_org = 0;
 912   BOOL b_reset_volume = FALSE;
 913
 914   memset (sz_cmd_buf, 0, sizeof(sz_cmd_buf));
 915   memset (sz_ret_buf, 0, sizeof(sz_ret_buf));
 916   sprintf (sz_cmd_buf,
 917            "open \"%s\" alias GNUEmacs_PlaySound_Device wait",
 918            psz_file);
 919   mci_error = mciSendString (sz_cmd_buf, sz_ret_buf, 520, NULL);
 920   if (mci_error != 0)
 921     {
 922       sound_warning ("The open mciSendString command failed to open\n"
 923                      "the specified sound file");
 924       i_result = (int) mci_error;
 925       return i_result;
 926     }
 927   if ((ui_volume > 0) && (ui_volume != UINT_MAX))
 928     {
 929       mm_result = waveOutGetVolume ((HWAVEOUT) WAVE_MAPPER, &ui_volume_org);
 930       if (mm_result == MMSYSERR_NOERROR)
 931         {
 932           b_reset_volume = TRUE;
 933           mm_result = waveOutSetVolume ((HWAVEOUT) WAVE_MAPPER, ui_volume);
 934           if ( mm_result != MMSYSERR_NOERROR)
 935             {
 936               sound_warning ("waveOutSetVolume failed to set the volume level\n"
 937                              "of the WAVE_MAPPER device.\n"
 938                              "As a result, the user selected volume level will\n"
 939                              "not be used.");
 940             }
 941         }
 942       else
 943         {
 944           sound_warning ("waveOutGetVolume failed to obtain the original\n"
 945                          "volume level of the WAVE_MAPPER device.\n"
 946                          "As a result, the user selected volume level will\n"
 947                          "not be used.");
 948         }
 949     }
 950   memset (sz_cmd_buf, 0, sizeof(sz_cmd_buf));
 951   memset (sz_ret_buf, 0, sizeof(sz_ret_buf));
 952   strcpy (sz_cmd_buf, "play GNUEmacs_PlaySound_Device wait");
 953   mci_error = mciSendString (sz_cmd_buf, sz_ret_buf, 520, NULL);
 954   if (mci_error != 0)
 955     {
 956       sound_warning ("The play mciSendString command failed to play the\n"
 957                      "opened sound file.");
 958       i_result = (int) mci_error;
 959     }
 960   memset (sz_cmd_buf, 0, sizeof(sz_cmd_buf));
 961   memset (sz_ret_buf, 0, sizeof(sz_ret_buf));
 962   strcpy (sz_cmd_buf, "close GNUEmacs_PlaySound_Device wait");
 963   mci_error = mciSendString (sz_cmd_buf, sz_ret_buf, 520, NULL);
 964   if (b_reset_volume == TRUE)
 965     {
 966       mm_result=waveOutSetVolume ((HWAVEOUT) WAVE_MAPPER, ui_volume_org);
 967       if (mm_result != MMSYSERR_NOERROR)
 968         {
 969           sound_warning ("waveOutSetVolume failed to reset the original volume\n"
 970                          "level of the WAVE_MAPPER device.");
 971         }
 972     }
 973   return i_result;
 974 }
 975
 976 /* END: Windows specific functions */
 977
 978 #endif /* WINDOWSNT */
 979
 980 DEFUN ("play-sound-internal", Fplay_sound_internal, Splay_sound_internal, 1, 1, 0,
 981        doc: /* Play sound SOUND.
 982
 983 Internal use only, use `play-sound' instead.\n  */)
 984      (sound)
 985      Lisp_Object sound;
 986 {
 987   Lisp_Object attrs[SOUND_ATTR_SENTINEL];
 988   int count = SPECPDL_INDEX ();
 989
 990 #ifndef WINDOWSNT
 991   Lisp_Object file;
 992   struct gcpro gcpro1, gcpro2;
 993   Lisp_Object args[2];
 994 #else /* WINDOWSNT */
 995   int len = 0;
 996   Lisp_Object lo_file = {0};
 997   char * psz_file = NULL;
 998   unsigned long ui_volume_tmp = UINT_MAX;
 999   unsigned long ui_volume = UINT_MAX;
1000   int i_result = 0;
1001 #endif /* WINDOWSNT */
1002
1003   /* Parse the sound specification.  Give up if it is invalid.  */
1004   if (!parse_sound (sound, attrs))
1005     error ("Invalid sound specification");
1006
1007 #ifndef WINDOWSNT
1008   file = Qnil;
1009   GCPRO2 (sound, file);
1010   current_sound_device = (struct sound_device *) xmalloc (sizeof (struct sound_device));
1011   bzero (current_sound_device, sizeof (struct sound_device));
1012   current_sound = (struct sound *) xmalloc (sizeof (struct sound));
1013   bzero (current_sound, sizeof (struct sound));
1014   record_unwind_protect (sound_cleanup, Qnil);
1015   current_sound->header = (char *) alloca (MAX_SOUND_HEADER_BYTES);
1016
1017   if (STRINGP (attrs[SOUND_FILE]))
1018     {
1019       /* Open the sound file.  */
1020       current_sound->fd = openp (Fcons (Vdata_directory, Qnil),
1021                                  attrs[SOUND_FILE], Qnil, &file, Qnil);
1022       if (current_sound->fd < 0)
1023         sound_perror ("Could not open sound file");
1024
1025       /* Read the first bytes from the file.  */
1026       current_sound->header_size
1027         = emacs_read (current_sound->fd, current_sound->header,
1028                       MAX_SOUND_HEADER_BYTES);
1029       if (current_sound->header_size < 0)
1030         sound_perror ("Invalid sound file header");
1031     }
1032   else
1033     {
1034       current_sound->data = attrs[SOUND_DATA];
1035       current_sound->header_size = min (MAX_SOUND_HEADER_BYTES, SBYTES (current_sound->data));
1036       bcopy (SDATA (current_sound->data), current_sound->header, current_sound->header_size);
1037     }
1038
1039   /* Find out the type of sound.  Give up if we can't tell.  */
1040   find_sound_type (current_sound);
1041
1042   /* Set up a device.  */
1043   if (STRINGP (attrs[SOUND_DEVICE]))
1044     {
1045       int len = SCHARS (attrs[SOUND_DEVICE]);
1046       current_sound_device->file = (char *) alloca (len + 1);
1047       strcpy (current_sound_device->file, SDATA (attrs[SOUND_DEVICE]));
1048     }
1049
1050   if (INTEGERP (attrs[SOUND_VOLUME]))
1051     current_sound_device->volume = XFASTINT (attrs[SOUND_VOLUME]);
1052   else if (FLOATP (attrs[SOUND_VOLUME]))
1053     current_sound_device->volume = XFLOAT_DATA (attrs[SOUND_VOLUME]) * 100;
1054
1055   args[0] = Qplay_sound_functions;
1056   args[1] = sound;
1057   Frun_hook_with_args (2, args);
1058
1059   /* There is only one type of device we currently support, the VOX
1060      sound driver.  Set up the device interface functions for that
1061      device.  */
1062   vox_init (current_sound_device);
1063
1064   /* Open the device.  */
1065   current_sound_device->open (current_sound_device);
1066
1067   /* Play the sound.  */
1068   current_sound->play (current_sound, current_sound_device);
1069
1070   /* Clean up.  */
1071   UNGCPRO;
1072
1073 #else /* WINDOWSNT */
1074
1075   lo_file = Fexpand_file_name (attrs[SOUND_FILE], Qnil);
1076   len = XSTRING (lo_file)->size;
1077   psz_file = (char *) alloca (len + 1);
1078   strcpy (psz_file, XSTRING (lo_file)->data);
1079   if (INTEGERP (attrs[SOUND_VOLUME]))
1080     {
1081       ui_volume_tmp = XFASTINT (attrs[SOUND_VOLUME]);
1082     }
1083   else if (FLOATP (attrs[SOUND_VOLUME]))
1084     {
1085       ui_volume_tmp = (unsigned long) XFLOAT_DATA (attrs[SOUND_VOLUME]) * 100;
1086     }
1087   /*
1088     Based on some experiments I have conducted, a value of 100 or less
1089     for the sound volume is much too low.  You cannot even hear it.
1090     A value of UINT_MAX indicates that you wish for the sound to played
1091     at the maximum possible volume.  A value of UINT_MAX/2 plays the
1092     sound at 50% maximum volume.  Therefore the value passed to do_play_sound
1093     (and thus to waveOutSetVolume) must be some fraction of UINT_MAX.
1094     The following code adjusts the user specified volume level appropriately.
1095   */
1096   if ((ui_volume_tmp > 0) && (ui_volume_tmp <= 100))
1097     {
1098       ui_volume = ui_volume_tmp * (UINT_MAX / 100);
1099     }
1100   i_result = do_play_sound (psz_file, ui_volume);
1101
1102 #endif /* WINDOWSNT */
1103
1104   unbind_to (count, Qnil);
1105   return Qnil;
1106 }
1107 \f
1108 /***********************************************************************
1109                             Initialization
1110  ***********************************************************************/
1111
1112 void
1113 syms_of_sound ()
1114 {
1115   QCdevice = intern (":device");
1116   staticpro (&QCdevice);
1117   QCvolume = intern (":volume");
1118   staticpro (&QCvolume);
1119   Qsound = intern ("sound");
1120   staticpro (&Qsound);
1121   Qplay_sound_functions = intern ("play-sound-functions");
1122   staticpro (&Qplay_sound_functions);
1123
1124   defsubr (&Splay_sound_internal);
1125 }
1126
1127
1128 void
1129 init_sound ()
1130 {
1131 }
1132
1133 #endif /* HAVE_SOUND */
1134
1135 /* arch-tag: dd850ad8-0433-4e2c-9cba-b7aeeccc0dbd
1136    (do not change this comment) */