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-internal' 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 void sound_warning P_ ((char *));
 239 static int parse_sound P_ ((Lisp_Object, Lisp_Object *));
 240 static void find_sound_type P_ ((struct sound *));
 241 static u_int32_t le2hl P_ ((u_int32_t));
 242 static u_int16_t le2hs P_ ((u_int16_t));
 243 static u_int32_t be2hl P_ ((u_int32_t));
 244 static int wav_init P_ ((struct sound *));
 245 static void wav_play P_ ((struct sound *, struct sound_device *));
 246 static int au_init P_ ((struct sound *));
 247 static void au_play P_ ((struct sound *, struct sound_device *));
 248
 249 #if 0 /* Currently not used.  */
 250 static u_int16_t be2hs P_ ((u_int16_t));
 251 #endif
 252
 253
 254 \f
 255 /***********************************************************************
 256                                General
 257  ***********************************************************************/
 258
 259 /* Like perror, but signals an error.  */
 260
 261 static void
 262 sound_perror (msg)
 263      char *msg;
 264 {
 265   int saved_errno = errno;
 266
 267   turn_on_atimers (1);
 268 #ifdef SIGIO
 269   sigunblock (sigmask (SIGIO));
 270 #endif
 271   if (saved_errno != 0)
 272     error ("%s: %s", msg, strerror (saved_errno));
 273   else
 274     error ("%s", msg);
 275 }
 276
 277
 278 /* Display a warning message.  */
 279
 280 static void
 281 sound_warning (msg)
 282      char *msg;
 283 {
 284   message (msg);
 285 }
 286
 287
 288 /* Parse sound specification SOUND, and fill ATTRS with what is
 289    found.  Value is non-zero if SOUND Is a valid sound specification.
 290    A valid sound specification is a list starting with the symbol
 291    `sound'.  The rest of the list is a property list which may
 292    contain the following key/value pairs:
 293
 294    - `:file FILE'
 295
 296    FILE is the sound file to play.  If it isn't an absolute name,
 297    it's searched under `data-directory'.
 298
 299    - `:data DATA'
 300
 301    DATA is a string containing sound data.  Either :file or :data
 302    may be present, but not both.
 303
 304    - `:device DEVICE'
 305
 306    DEVICE is the name of the device to play on, e.g. "/dev/dsp2".
 307    If not specified, a default device is used.
 308
 309    - `:volume VOL'
 310
 311    VOL must be an integer in the range [0, 100], or a float in the
 312    range [0, 1].  */
 313
 314 static int
 315 parse_sound (sound, attrs)
 316      Lisp_Object sound;
 317      Lisp_Object *attrs;
 318 {
 319   /* SOUND must be a list starting with the symbol `sound'.  */
 320   if (!CONSP (sound) || !EQ (XCAR (sound), Qsound))
 321     return 0;
 322
 323   sound = XCDR (sound);
 324   attrs[SOUND_FILE] = Fplist_get (sound, QCfile);
 325   attrs[SOUND_DATA] = Fplist_get (sound, QCdata);
 326   attrs[SOUND_DEVICE] = Fplist_get (sound, QCdevice);
 327   attrs[SOUND_VOLUME] = Fplist_get (sound, QCvolume);
 328
 329   /* File name or data must be specified.  */
 330   if (!STRINGP (attrs[SOUND_FILE])
 331       && !STRINGP (attrs[SOUND_DATA]))
 332     return 0;
 333
 334   /* Volume must be in the range 0..100 or unspecified.  */
 335   if (!NILP (attrs[SOUND_VOLUME]))
 336     {
 337       if (INTEGERP (attrs[SOUND_VOLUME]))
 338         {
 339           if (XINT (attrs[SOUND_VOLUME]) < 0
 340               || XINT (attrs[SOUND_VOLUME]) > 100)
 341             return 0;
 342         }
 343       else if (FLOATP (attrs[SOUND_VOLUME]))
 344         {
 345           if (XFLOAT_DATA (attrs[SOUND_VOLUME]) < 0
 346               || XFLOAT_DATA (attrs[SOUND_VOLUME]) > 1)
 347             return 0;
 348         }
 349       else
 350         return 0;
 351     }
 352
 353   /* Device must be a string or unspecified.  */
 354   if (!NILP (attrs[SOUND_DEVICE])
 355       && !STRINGP (attrs[SOUND_DEVICE]))
 356     return 0;
 357
 358   return 1;
 359 }
 360
 361
 362 /* Find out the type of the sound file whose file descriptor is FD.
 363    S is the sound file structure to fill in.  */
 364
 365 static void
 366 find_sound_type (s)
 367      struct sound *s;
 368 {
 369   if (!wav_init (s) && !au_init (s))
 370     error ("Unknown sound format");
 371 }
 372
 373
 374 /* Function installed by play-sound-internal with record_unwind_protect.  */
 375
 376 static Lisp_Object
 377 sound_cleanup (arg)
 378      Lisp_Object arg;
 379 {
 380   if (current_sound_device)
 381     {
 382       if (current_sound_device->close)
 383         current_sound_device->close (current_sound_device);
 384       if (current_sound->fd > 0)
 385         emacs_close (current_sound->fd);
 386     }
 387
 388   return Qnil;
 389 }
 390
 391
 392 DEFUN ("play-sound-internal", Fplay_sound_internal, Splay_sound_internal, 1, 1, 0,
 393        doc: /* Play sound SOUND.
 394
 395 Internal use only, use `play-sound' instead.  */)
 396      (sound)
 397      Lisp_Object sound;
 398 {
 399   Lisp_Object attrs[SOUND_ATTR_SENTINEL];
 400   Lisp_Object file;
 401   struct gcpro gcpro1, gcpro2;
 402   struct sound_device sd;
 403   struct sound s;
 404   Lisp_Object args[2];
 405   int count = SPECPDL_INDEX ();
 406
 407   file = Qnil;
 408   GCPRO2 (sound, file);
 409   bzero (&sd, sizeof sd);
 410   bzero (&s, sizeof s);
 411   current_sound_device = &sd;
 412   current_sound = &s;
 413   record_unwind_protect (sound_cleanup, Qnil);
 414   s.header = (char *) alloca (MAX_SOUND_HEADER_BYTES);
 415
 416   /* Parse the sound specification.  Give up if it is invalid.  */
 417   if (!parse_sound (sound, attrs))
 418     error ("Invalid sound specification");
 419
 420   if (STRINGP (attrs[SOUND_FILE]))
 421     {
 422       /* Open the sound file.  */
 423       s.fd = openp (Fcons (Vdata_directory, Qnil),
 424                     attrs[SOUND_FILE], Qnil, &file, Qnil);
 425       if (s.fd < 0)
 426         sound_perror ("Could not open sound file");
 427
 428       /* Read the first bytes from the file.  */
 429       s.header_size = emacs_read (s.fd, s.header, MAX_SOUND_HEADER_BYTES);
 430       if (s.header_size < 0)
 431         sound_perror ("Invalid sound file header");
 432     }
 433   else
 434     {
 435       s.data = attrs[SOUND_DATA];
 436       s.header_size = min (MAX_SOUND_HEADER_BYTES, STRING_BYTES (XSTRING (s.data)));
 437       bcopy (XSTRING (s.data)->data, s.header, s.header_size);
 438     }
 439
 440   /* Find out the type of sound.  Give up if we can't tell.  */
 441   find_sound_type (&s);
 442
 443   /* Set up a device.  */
 444   if (STRINGP (attrs[SOUND_DEVICE]))
 445     {
 446       int len = XSTRING (attrs[SOUND_DEVICE])->size;
 447       sd.file = (char *) alloca (len + 1);
 448       strcpy (sd.file, XSTRING (attrs[SOUND_DEVICE])->data);
 449     }
 450
 451   if (INTEGERP (attrs[SOUND_VOLUME]))
 452     sd.volume = XFASTINT (attrs[SOUND_VOLUME]);
 453   else if (FLOATP (attrs[SOUND_VOLUME]))
 454     sd.volume = XFLOAT_DATA (attrs[SOUND_VOLUME]) * 100;
 455
 456   args[0] = Qplay_sound_functions;
 457   args[1] = sound;
 458   Frun_hook_with_args (2, args);
 459
 460   /* There is only one type of device we currently support, the VOX
 461      sound driver.  Set up the device interface functions for that
 462      device.  */
 463   vox_init (&sd);
 464
 465   /* Open the device.  */
 466   sd.open (&sd);
 467
 468   /* Play the sound.  */
 469   s.play (&s, &sd);
 470
 471   /* Close the input file, if any.  */
 472   if (!STRINGP (s.data))
 473     {
 474       emacs_close (s.fd);
 475       s.fd = -1;
 476     }
 477
 478   /* Close the device.  */
 479   sd.close (&sd);
 480
 481   /* Clean up.  */
 482   current_sound_device = NULL;
 483   current_sound = NULL;
 484   UNGCPRO;
 485   unbind_to (count, Qnil);
 486   return Qnil;
 487 }
 488
 489 \f
 490 /***********************************************************************
 491                         Byte-order Conversion
 492  ***********************************************************************/
 493
 494 /* Convert 32-bit value VALUE which is in little-endian byte-order
 495    to host byte-order.  */
 496
 497 static u_int32_t
 498 le2hl (value)
 499      u_int32_t value;
 500 {
 501 #ifdef WORDS_BIG_ENDIAN
 502   unsigned char *p = (unsigned char *) &value;
 503   value = p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
 504 #endif
 505   return value;
 506 }
 507
 508
 509 /* Convert 16-bit value VALUE which is in little-endian byte-order
 510    to host byte-order.  */
 511
 512 static u_int16_t
 513 le2hs (value)
 514      u_int16_t value;
 515 {
 516 #ifdef WORDS_BIG_ENDIAN
 517   unsigned char *p = (unsigned char *) &value;
 518   value = p[0] + (p[1] << 8);
 519 #endif
 520   return value;
 521 }
 522
 523
 524 /* Convert 32-bit value VALUE which is in big-endian byte-order
 525    to host byte-order.  */
 526
 527 static u_int32_t
 528 be2hl (value)
 529      u_int32_t value;
 530 {
 531 #ifndef WORDS_BIG_ENDIAN
 532   unsigned char *p = (unsigned char *) &value;
 533   value = p[3] + (p[2] << 8) + (p[1] << 16) + (p[0] << 24);
 534 #endif
 535   return value;
 536 }
 537
 538
 539 #if 0 /* Currently not used.  */
 540
 541 /* Convert 16-bit value VALUE which is in big-endian byte-order
 542    to host byte-order.  */
 543
 544 static u_int16_t
 545 be2hs (value)
 546      u_int16_t value;
 547 {
 548 #ifndef WORDS_BIG_ENDIAN
 549   unsigned char *p = (unsigned char *) &value;
 550   value = p[1] + (p[0] << 8);
 551 #endif
 552   return value;
 553 }
 554
 555 #endif /* 0 */
 556
 557 \f
 558 /***********************************************************************
 559                           RIFF-WAVE (*.wav)
 560  ***********************************************************************/
 561
 562 /* Try to initialize sound file S from S->header.  S->header
 563    contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
 564    sound file.  If the file is a WAV-format file, set up interface
 565    functions in S and convert header fields to host byte-order.
 566    Value is non-zero if the file is a WAV file.  */
 567
 568 static int
 569 wav_init (s)
 570      struct sound *s;
 571 {
 572   struct wav_header *header = (struct wav_header *) s->header;
 573
 574   if (s->header_size < sizeof *header
 575       || bcmp (s->header, "RIFF", 4) != 0)
 576     return 0;
 577
 578   /* WAV files are in little-endian order.  Convert the header
 579      if on a big-endian machine.  */
 580   header->magic = le2hl (header->magic);
 581   header->length = le2hl (header->length);
 582   header->chunk_type = le2hl (header->chunk_type);
 583   header->chunk_format = le2hl (header->chunk_format);
 584   header->chunk_length = le2hl (header->chunk_length);
 585   header->format = le2hs (header->format);
 586   header->channels = le2hs (header->channels);
 587   header->sample_rate = le2hl (header->sample_rate);
 588   header->bytes_per_second = le2hl (header->bytes_per_second);
 589   header->sample_size = le2hs (header->sample_size);
 590   header->precision = le2hs (header->precision);
 591   header->chunk_data = le2hl (header->chunk_data);
 592   header->data_length = le2hl (header->data_length);
 593
 594   /* Set up the interface functions for WAV.  */
 595   s->type = RIFF;
 596   s->play = wav_play;
 597
 598   return 1;
 599 }
 600
 601
 602 /* Play RIFF-WAVE audio file S on sound device SD.  */
 603
 604 static void
 605 wav_play (s, sd)
 606      struct sound *s;
 607      struct sound_device *sd;
 608 {
 609   struct wav_header *header = (struct wav_header *) s->header;
 610
 611   /* Let the device choose a suitable device-dependent format
 612      for the file.  */
 613   sd->choose_format (sd, s);
 614
 615   /* Configure the device.  */
 616   sd->sample_size = header->sample_size;
 617   sd->sample_rate = header->sample_rate;
 618   sd->bps = header->bytes_per_second;
 619   sd->channels = header->channels;
 620   sd->configure (sd);
 621
 622   /* Copy sound data to the device.  The WAV file specification is
 623      actually more complex.  This simple scheme worked with all WAV
 624      files I found so far.  If someone feels inclined to implement the
 625      whole RIFF-WAVE spec, please do.  */
 626   if (STRINGP (s->data))
 627     sd->write (sd, XSTRING (s->data)->data + sizeof *header,
 628                STRING_BYTES (XSTRING (s->data)) - sizeof *header);
 629   else
 630     {
 631       char *buffer;
 632       int nbytes;
 633       int blksize = 2048;
 634
 635       buffer = (char *) alloca (blksize);
 636       lseek (s->fd, sizeof *header, SEEK_SET);
 637
 638       while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
 639         sd->write (sd, buffer, nbytes);
 640
 641       if (nbytes < 0)
 642         sound_perror ("Error reading sound file");
 643     }
 644 }
 645
 646
 647 \f
 648 /***********************************************************************
 649                            Sun Audio (*.au)
 650  ***********************************************************************/
 651
 652 /* Sun audio file encodings.  */
 653
 654 enum au_encoding
 655 {
 656   AU_ENCODING_ULAW_8 = 1,
 657   AU_ENCODING_8,
 658   AU_ENCODING_16,
 659   AU_ENCODING_24,
 660   AU_ENCODING_32,
 661   AU_ENCODING_IEEE32,
 662   AU_ENCODING_IEEE64,
 663   AU_COMPRESSED = 23
 664 };
 665
 666
 667 /* Try to initialize sound file S from S->header.  S->header
 668    contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
 669    sound file.  If the file is a AU-format file, set up interface
 670    functions in S and convert header fields to host byte-order.
 671    Value is non-zero if the file is an AU file.  */
 672
 673 static int
 674 au_init (s)
 675      struct sound *s;
 676 {
 677   struct au_header *header = (struct au_header *) s->header;
 678
 679   if (s->header_size < sizeof *header
 680       || bcmp (s->header, ".snd", 4) != 0)
 681     return 0;
 682
 683   header->magic_number = be2hl (header->magic_number);
 684   header->data_offset = be2hl (header->data_offset);
 685   header->data_size = be2hl (header->data_size);
 686   header->encoding = be2hl (header->encoding);
 687   header->sample_rate = be2hl (header->sample_rate);
 688   header->channels = be2hl (header->channels);
 689
 690   /* Set up the interface functions for AU.  */
 691   s->type = SUN_AUDIO;
 692   s->play = au_play;
 693
 694   return 1;
 695 }
 696
 697
 698 /* Play Sun audio file S on sound device SD.  */
 699
 700 static void
 701 au_play (s, sd)
 702      struct sound *s;
 703      struct sound_device *sd;
 704 {
 705   struct au_header *header = (struct au_header *) s->header;
 706
 707   sd->sample_size = 0;
 708   sd->sample_rate = header->sample_rate;
 709   sd->bps = 0;
 710   sd->channels = header->channels;
 711   sd->choose_format (sd, s);
 712   sd->configure (sd);
 713
 714   if (STRINGP (s->data))
 715     sd->write (sd, XSTRING (s->data)->data + header->data_offset,
 716                STRING_BYTES (XSTRING (s->data)) - header->data_offset);
 717   else
 718     {
 719       int blksize = 2048;
 720       char *buffer;
 721       int nbytes;
 722
 723       /* Seek */
 724       lseek (s->fd, header->data_offset, SEEK_SET);
 725
 726       /* Copy sound data to the device.  */
 727       buffer = (char *) alloca (blksize);
 728       while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
 729         sd->write (sd, buffer, nbytes);
 730
 731       if (nbytes < 0)
 732         sound_perror ("Error reading sound file");
 733     }
 734 }
 735
 736
 737 \f
 738 /***********************************************************************
 739                        Voxware Driver Interface
 740  ***********************************************************************/
 741
 742 /* This driver is available on GNU/Linux, and the free BSDs.  FreeBSD
 743    has a compatible own driver aka Luigi's driver.  */
 744
 745
 746 /* Open device SD.  If SD->file is non-null, open that device,
 747    otherwise use a default device name.  */
 748
 749 static void
 750 vox_open (sd)
 751      struct sound_device *sd;
 752 {
 753   char *file;
 754
 755   /* Open the sound device.  Default is /dev/dsp.  */
 756   if (sd->file)
 757     file = sd->file;
 758   else
 759     file = DEFAULT_SOUND_DEVICE;
 760
 761   sd->fd = emacs_open (file, O_WRONLY, 0);
 762   if (sd->fd < 0)
 763     sound_perror (file);
 764 }
 765
 766
 767 /* Configure device SD from parameters in it.  */
 768
 769 static void
 770 vox_configure (sd)
 771      struct sound_device *sd;
 772 {
 773   int val;
 774
 775   xassert (sd->fd >= 0);
 776
 777   /* On GNU/Linux, it seems that the device driver doesn't like to be
 778      interrupted by a signal.  Block the ones we know to cause
 779      troubles.  */
 780   turn_on_atimers (0);
 781 #ifdef SIGIO
 782   sigblock (sigmask (SIGIO));
 783 #endif
 784
 785   val = sd->format;
 786   if (ioctl (sd->fd, SNDCTL_DSP_SETFMT, &sd->format) < 0
 787       || val != sd->format)
 788     sound_perror ("Could not set sound format");
 789
 790   val = sd->channels != 1;
 791   if (ioctl (sd->fd, SNDCTL_DSP_STEREO, &val) < 0
 792       || val != (sd->channels != 1))
 793     sound_perror ("Could not set stereo/mono");
 794
 795   /* I think bps and sampling_rate are the same, but who knows.
 796      Check this. and use SND_DSP_SPEED for both.  */
 797   if (sd->sample_rate > 0)
 798     {
 799       val = sd->sample_rate;
 800       if (ioctl (sd->fd, SNDCTL_DSP_SPEED, &sd->sample_rate) < 0)
 801         sound_perror ("Could not set sound speed");
 802       else if (val != sd->sample_rate)
 803         sound_warning ("Could not set sample rate");
 804     }
 805
 806   if (sd->volume > 0)
 807     {
 808       int volume = sd->volume & 0xff;
 809       volume |= volume << 8;
 810       /* This may fail if there is no mixer.  Ignore the failure.  */
 811       ioctl (sd->fd, SOUND_MIXER_WRITE_PCM, &volume);
 812     }
 813
 814   turn_on_atimers (1);
 815 #ifdef SIGIO
 816   sigunblock (sigmask (SIGIO));
 817 #endif
 818 }
 819
 820
 821 /* Close device SD if it is open.  */
 822
 823 static void
 824 vox_close (sd)
 825      struct sound_device *sd;
 826 {
 827   if (sd->fd >= 0)
 828     {
 829       /* On GNU/Linux, it seems that the device driver doesn't like to
 830          be interrupted by a signal.  Block the ones we know to cause
 831          troubles.  */
 832 #ifdef SIGIO
 833       sigblock (sigmask (SIGIO));
 834 #endif
 835       turn_on_atimers (0);
 836
 837       /* Flush sound data, and reset the device.  */
 838       ioctl (sd->fd, SNDCTL_DSP_SYNC, NULL);
 839
 840       turn_on_atimers (1);
 841 #ifdef SIGIO
 842       sigunblock (sigmask (SIGIO));
 843 #endif
 844
 845       /* Close the device.  */
 846       emacs_close (sd->fd);
 847       sd->fd = -1;
 848     }
 849 }
 850
 851
 852 /* Choose device-dependent format for device SD from sound file S.  */
 853
 854 static void
 855 vox_choose_format (sd, s)
 856      struct sound_device *sd;
 857      struct sound *s;
 858 {
 859   if (s->type == RIFF)
 860     {
 861       struct wav_header *h = (struct wav_header *) s->header;
 862       if (h->precision == 8)
 863         sd->format = AFMT_U8;
 864       else if (h->precision == 16)
 865         sd->format = AFMT_S16_LE;
 866       else
 867         error ("Unsupported WAV file format");
 868     }
 869   else if (s->type == SUN_AUDIO)
 870     {
 871       struct au_header *header = (struct au_header *) s->header;
 872       switch (header->encoding)
 873         {
 874         case AU_ENCODING_ULAW_8:
 875         case AU_ENCODING_IEEE32:
 876         case AU_ENCODING_IEEE64:
 877           sd->format = AFMT_MU_LAW;
 878           break;
 879
 880         case AU_ENCODING_8:
 881         case AU_ENCODING_16:
 882         case AU_ENCODING_24:
 883         case AU_ENCODING_32:
 884           sd->format = AFMT_S16_LE;
 885           break;
 886
 887         default:
 888           error ("Unsupported AU file format");
 889         }
 890     }
 891   else
 892     abort ();
 893 }
 894
 895
 896 /* Initialize device SD.  Set up the interface functions in the device
 897    structure.  */
 898
 899 static void
 900 vox_init (sd)
 901      struct sound_device *sd;
 902 {
 903   sd->fd = -1;
 904   sd->open = vox_open;
 905   sd->close = vox_close;
 906   sd->configure = vox_configure;
 907   sd->choose_format = vox_choose_format;
 908   sd->write = vox_write;
 909 }
 910
 911
 912 /* Write NBYTES bytes from BUFFER to device SD.  */
 913
 914 static void
 915 vox_write (sd, buffer, nbytes)
 916      struct sound_device *sd;
 917      char *buffer;
 918      int nbytes;
 919 {
 920   int nwritten = emacs_write (sd->fd, buffer, nbytes);
 921   if (nwritten < 0)
 922     sound_perror ("Error writing to sound device");
 923 }
 924
 925
 926 \f
 927 /***********************************************************************
 928                             Initialization
 929  ***********************************************************************/
 930
 931 void
 932 syms_of_sound ()
 933 {
 934   QCdevice = intern (":device");
 935   staticpro (&QCdevice);
 936   QCvolume = intern (":volume");
 937   staticpro (&QCvolume);
 938   Qsound = intern ("sound");
 939   staticpro (&Qsound);
 940   Qplay_sound_functions = intern ("play-sound-functions");
 941   staticpro (&Qplay_sound_functions);
 942
 943   defsubr (&Splay_sound_internal);
 944 }
 945
 946
 947 void
 948 init_sound ()
 949 {
 950 }
 951
 952 #endif /* HAVE_SOUND */