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[emacs.git] / src / sound.c
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1 /* sound.c -- sound support.
2 Copyright (C) 1998, 1999 Free Software Foundation.
4 This file is part of GNU Emacs.
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.
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.
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. */
21 /* Written by Gerd Moellmann <gerd@gnu.org>. Tested with Luigi's
22 driver on FreeBSD 2.2.7 with a SoundBlaster 16. */
24 #include <config.h>
26 #if defined HAVE_SOUND
28 #include <lisp.h>
29 #include <fcntl.h>
30 #include <unistd.h>
31 #include <sys/types.h>
32 #include <dispextern.h>
33 #include <errno.h>
35 /* FreeBSD has machine/soundcard.h. Voxware sound driver docs mention
36 sys/soundcard.h. So, let's try whatever's there. */
38 #ifdef HAVE_MACHINE_SOUNDCARD_H
39 #include <machine/soundcard.h>
40 #endif
41 #ifdef HAVE_SYS_SOUNDCARD_H
42 #include <sys/soundcard.h>
43 #endif
44 #ifdef HAVE_SOUNDCARD_H
45 #include <sys/ioctl.h>
46 #include <soundcard.h>
47 #endif
49 #ifndef DEFAULT_SOUND_DEVICE
50 #define DEFAULT_SOUND_DEVICE "/dev/dsp"
51 #endif
53 #define max(X, Y) ((X) > (Y) ? (X) : (Y))
54 #define min(X, Y) ((X) < (Y) ? (X) : (Y))
55 #define abs(X) ((X) < 0 ? -(X) : (X))
57 /* Structure forward declarations. */
59 struct sound;
60 struct sound_device;
62 /* The file header of RIFF-WAVE files (*.wav). Files are always in
63 little-endian byte-order. */
65 struct wav_header
67 u_int32_t magic;
68 u_int32_t length;
69 u_int32_t chunk_type;
70 u_int32_t chunk_format;
71 u_int32_t chunk_length;
72 u_int16_t format;
73 u_int16_t channels;
74 u_int32_t sample_rate;
75 u_int32_t bytes_per_second;
76 u_int16_t sample_size;
77 u_int16_t precision;
78 u_int32_t chunk_data;
79 u_int32_t data_length;
82 /* The file header of Sun adio files (*.au). Files are always in
83 big-endian byte-order. */
85 struct au_header
87 /* ASCII ".snd" */
88 u_int32_t magic_number;
90 /* Offset of data part from start of file. Minimum value is 24. */
91 u_int32_t data_offset;
93 /* Size of data part, 0xffffffff if unknown. */
94 u_int32_t data_size;
96 /* Data encoding format.
97 1 8-bit ISDN u-law
98 2 8-bit linear PCM (REF-PCM)
99 3 16-bit linear PCM
100 4 24-bit linear PCM
101 5 32-bit linear PCM
102 6 32-bit IEEE floating-point
103 7 64-bit IEEE floating-point
104 23 8-bit u-law compressed using CCITT 0.721 ADPCM voice data
105 encoding scheme. */
106 u_int32_t encoding;
108 /* Number of samples per second. */
109 u_int32_t sample_rate;
111 /* Number of interleaved channels. */
112 u_int32_t channels;
115 /* Maximum of all sound file headers sizes. */
117 #define MAX_SOUND_HEADER_BYTES \
118 max (sizeof (struct wav_header), sizeof (struct au_header))
120 /* Interface structure for sound devices. */
122 struct sound_device
124 /* The name of the device or null meaning use a default device name. */
125 char *file;
127 /* File descriptor of the device. */
128 int fd;
130 /* Device-dependent format. */
131 int format;
133 /* Volume (0..100). Zero means unspecified. */
134 int volume;
136 /* Sample size. */
137 int sample_size;
139 /* Sample rate. */
140 int sample_rate;
142 /* Bytes per second. */
143 int bps;
145 /* 1 = mono, 2 = stereo, 0 = don't set. */
146 int channels;
148 /* Open device SD. */
149 void (* open) P_ ((struct sound_device *sd));
151 /* Close device SD. */
152 void (* close) P_ ((struct sound_device *sd));
154 /* Configure SD accoring to device-dependent parameters. */
155 void (* configure) P_ ((struct sound_device *device));
157 /* Choose a device-dependent format for outputting sound S. */
158 void (* choose_format) P_ ((struct sound_device *sd,
159 struct sound *s));
161 /* Write NYBTES bytes from BUFFER to device SD. */
162 void (* write) P_ ((struct sound_device *sd, char *buffer, int nbytes));
164 /* A place for devices to store additional data. */
165 void *data;
168 /* An enumerator for each supported sound file type. */
170 enum sound_type
172 RIFF,
173 SUN_AUDIO
176 /* Interface structure for sound files. */
178 struct sound
180 /* The type of the file. */
181 enum sound_type type;
183 /* File descriptor of a sound file. */
184 int fd;
186 /* Pointer to sound file header. This contains header_size bytes
187 read from the start of a sound file. */
188 char *header;
190 /* Number of bytes raed from sound file. This is always <=
191 MAX_SOUND_HEADER_BYTES. */
192 int header_size;
194 /* Sound data, if a string. */
195 Lisp_Object data;
197 /* Play sound file S on device SD. */
198 void (* play) P_ ((struct sound *s, struct sound_device *sd));
201 /* Indices of attributes in a sound attributes vector. */
203 enum sound_attr
205 SOUND_FILE,
206 SOUND_DATA,
207 SOUND_DEVICE,
208 SOUND_VOLUME,
209 SOUND_ATTR_SENTINEL
212 /* Symbols. */
214 extern Lisp_Object QCfile, QCdata;
215 Lisp_Object QCvolume, QCdevice;
216 Lisp_Object Qsound;
217 Lisp_Object Qplay_sound_functions;
219 /* These are set during `play-sound' so that sound_cleanup has
220 access to them. */
222 struct sound_device *current_sound_device;
223 struct sound *current_sound;
225 /* Function prototypes. */
227 static void vox_open P_ ((struct sound_device *));
228 static void vox_configure P_ ((struct sound_device *));
229 static void vox_close P_ ((struct sound_device *sd));
230 static void vox_choose_format P_ ((struct sound_device *, struct sound *));
231 static void vox_init P_ ((struct sound_device *));
232 static void vox_write P_ ((struct sound_device *, char *, int));
233 static void sound_perror P_ ((char *));
234 static int parse_sound P_ ((Lisp_Object, Lisp_Object *));
235 static void find_sound_type P_ ((struct sound *));
236 static u_int32_t le2hl P_ ((u_int32_t));
237 static u_int16_t le2hs P_ ((u_int16_t));
238 static u_int32_t be2hl P_ ((u_int32_t));
239 static int wav_init P_ ((struct sound *));
240 static void wav_play P_ ((struct sound *, struct sound_device *));
241 static int au_init P_ ((struct sound *));
242 static void au_play P_ ((struct sound *, struct sound_device *));
244 #if 0 /* Currently not used. */
245 static u_int16_t be2hs P_ ((u_int16_t));
246 #endif
250 /***********************************************************************
251 General
252 ***********************************************************************/
254 /* Like perror, but signals an error. */
256 static void
257 sound_perror (msg)
258 char *msg;
260 error ("%s: %s", msg, strerror (errno));
264 /* Parse sound specification SOUND, and fill ATTRS with what is
265 found. Value is non-zero if SOUND Is a valid sound specification.
266 A valid sound specification is a list starting with the symbol
267 `sound'. The rest of the list is a property list which may
268 contain the following key/value pairs:
270 - `:file FILE'
272 FILE is the sound file to play. If it isn't an absolute name,
273 it's searched under `data-directory'.
275 - `:data DATA'
277 DATA is a string containing sound data. Either :file or :data
278 may be present, but not both.
280 - `:device DEVICE'
282 DEVICE is the name of the device to play on, e.g. "/dev/dsp2".
283 If not specified, a default device is used.
285 - `:volume VOL'
287 VOL must be an integer in the range [0, 100], or a float in the
288 range [0, 1]. */
290 static int
291 parse_sound (sound, attrs)
292 Lisp_Object sound;
293 Lisp_Object *attrs;
295 /* SOUND must be a list starting with the symbol `sound'. */
296 if (!CONSP (sound) || !EQ (XCAR (sound), Qsound))
297 return 0;
299 sound = XCDR (sound);
300 attrs[SOUND_FILE] = Fplist_get (sound, QCfile);
301 attrs[SOUND_DATA] = Fplist_get (sound, QCdata);
302 attrs[SOUND_DEVICE] = Fplist_get (sound, QCdevice);
303 attrs[SOUND_VOLUME] = Fplist_get (sound, QCvolume);
305 /* File name or data must be specified. */
306 if (!STRINGP (attrs[SOUND_FILE])
307 && !STRINGP (attrs[SOUND_DATA]))
308 return 0;
310 /* Volume must be in the range 0..100 or unspecified. */
311 if (!NILP (attrs[SOUND_VOLUME]))
313 if (INTEGERP (attrs[SOUND_VOLUME]))
315 if (XINT (attrs[SOUND_VOLUME]) < 0
316 || XINT (attrs[SOUND_VOLUME]) > 100)
317 return 0;
319 else if (FLOATP (attrs[SOUND_VOLUME]))
321 if (XFLOAT_DATA (attrs[SOUND_VOLUME]) < 0
322 || XFLOAT_DATA (attrs[SOUND_VOLUME]) > 1)
323 return 0;
325 else
326 return 0;
329 /* Device must be a string or unspecified. */
330 if (!NILP (attrs[SOUND_DEVICE])
331 && !STRINGP (attrs[SOUND_DEVICE]))
332 return 0;
334 return 1;
338 /* Find out the type of the sound file whose file descriptor is FD.
339 S is the sound file structure to fill in. */
341 static void
342 find_sound_type (s)
343 struct sound *s;
345 if (!wav_init (s) && !au_init (s))
346 error ("Unknown sound format");
350 /* Function installed by play-sound with record_unwind_protect. */
352 static Lisp_Object
353 sound_cleanup (arg)
354 Lisp_Object arg;
356 if (current_sound_device)
358 if (current_sound_device->close)
359 current_sound_device->close (current_sound_device);
360 if (current_sound->fd > 0)
361 emacs_close (current_sound->fd);
364 return Qnil;
368 DEFUN ("play-sound", Fplay_sound, Splay_sound, 1, 1, 0,
369 "Play sound SOUND.\n\
370 SOUND is a list of the form `(sound KEYWORD VALUE...)'.\n\
371 The following keywords are recognized:\n\
373 :file FILE.- read sound data from FILE. If FILE isn't an\n\
374 absolute file name, it is searched in `data-directory'.\n\
376 :data DATA - read sound data from string DATA.\n\
378 Exactly one of :file or :data must be present.\n\
380 :volume VOL - set volume to VOL. VOL must an integer in the\n\
381 range 0..100 or a float in the range 0..1.0. If not specified,\n\
382 don't change the volume setting of the sound device.\n\
384 :device DEVICE - play sound on DEVICE. If not specified,\n\
385 a system-dependent default device name is used.")
386 (sound)
387 Lisp_Object sound;
389 Lisp_Object attrs[SOUND_ATTR_SENTINEL];
390 Lisp_Object file;
391 struct gcpro gcpro1, gcpro2;
392 struct sound_device sd;
393 struct sound s;
394 Lisp_Object args[2];
395 int count = specpdl_ptr - specpdl;
397 file = Qnil;
398 GCPRO2 (sound, file);
399 bzero (&sd, sizeof sd);
400 bzero (&s, sizeof s);
401 current_sound_device = &sd;
402 current_sound = &s;
403 record_unwind_protect (sound_cleanup, Qnil);
404 s.header = (char *) alloca (MAX_SOUND_HEADER_BYTES);
406 /* Parse the sound specification. Give up if it is invalid. */
407 if (!parse_sound (sound, attrs))
408 error ("Invalid sound specification");
410 if (STRINGP (attrs[SOUND_FILE]))
412 /* Open the sound file. */
413 s.fd = openp (Fcons (Vdata_directory, Qnil),
414 attrs[SOUND_FILE], "", &file, 0);
415 if (s.fd < 0)
416 sound_perror ("Open sound file");
418 /* Read the first bytes from the file. */
419 s.header_size = emacs_read (s.fd, s.header, MAX_SOUND_HEADER_BYTES);
420 if (s.header_size < 0)
421 sound_perror ("Reading sound file header");
423 else
425 s.data = attrs[SOUND_DATA];
426 bcopy (XSTRING (s.data)->data, s.header,
427 min (MAX_SOUND_HEADER_BYTES, STRING_BYTES (XSTRING (s.data))));
430 /* Find out the type of sound. Give up if we can't tell. */
431 find_sound_type (&s);
433 /* Set up a device. */
434 if (STRINGP (attrs[SOUND_DEVICE]))
436 int len = XSTRING (attrs[SOUND_DEVICE])->size;
437 sd.file = (char *) alloca (len + 1);
438 strcpy (sd.file, XSTRING (attrs[SOUND_DEVICE])->data);
441 if (INTEGERP (attrs[SOUND_VOLUME]))
442 sd.volume = XFASTINT (attrs[SOUND_VOLUME]);
443 else if (FLOATP (attrs[SOUND_VOLUME]))
444 sd.volume = XFLOAT_DATA (attrs[SOUND_VOLUME]) * 100;
446 args[0] = Qplay_sound_functions;
447 args[1] = sound;
448 Frun_hook_with_args (2, args);
450 /* There is only one type of device we currently support, the VOX
451 sound driver. Set up the device interface functions for that
452 device. */
453 vox_init (&sd);
455 /* Open the device. */
456 sd.open (&sd);
458 /* Play the sound. */
459 s.play (&s, &sd);
461 /* Close the input file, if any. */
462 if (!STRINGP (s.data))
464 emacs_close (s.fd);
465 s.fd = -1;
468 /* Close the device. */
469 sd.close (&sd);
471 /* Clean up. */
472 current_sound_device = NULL;
473 current_sound = NULL;
474 UNGCPRO;
475 unbind_to (count, Qnil);
476 return Qnil;
480 /***********************************************************************
481 Byte-order Conversion
482 ***********************************************************************/
484 /* Convert 32-bit value VALUE which is in little-endian byte-order
485 to host byte-order. */
487 static u_int32_t
488 le2hl (value)
489 u_int32_t value;
491 #ifdef WORDS_BIG_ENDIAN
492 unsigned char *p = (unsigned char *) &value;
493 value = p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
494 #endif
495 return value;
499 /* Convert 16-bit value VALUE which is in little-endian byte-order
500 to host byte-order. */
502 static u_int16_t
503 le2hs (value)
504 u_int16_t value;
506 #ifdef WORDS_BIG_ENDIAN
507 unsigned char *p = (unsigned char *) &value;
508 value = p[0] + (p[1] << 8);
509 #endif
510 return value;
514 /* Convert 32-bit value VALUE which is in big-endian byte-order
515 to host byte-order. */
517 static u_int32_t
518 be2hl (value)
519 u_int32_t value;
521 #ifndef WORDS_BIG_ENDIAN
522 unsigned char *p = (unsigned char *) &value;
523 value = p[3] + (p[2] << 8) + (p[1] << 16) + (p[0] << 24);
524 #endif
525 return value;
529 #if 0 /* Currently not used. */
531 /* Convert 16-bit value VALUE which is in big-endian byte-order
532 to host byte-order. */
534 static u_int16_t
535 be2hs (value)
536 u_int16_t value;
538 #ifndef WORDS_BIG_ENDIAN
539 unsigned char *p = (unsigned char *) &value;
540 value = p[1] + (p[0] << 8);
541 #endif
542 return value;
545 #endif /* 0 */
548 /***********************************************************************
549 RIFF-WAVE (*.wav)
550 ***********************************************************************/
552 /* Try to initialize sound file S from S->header. S->header
553 contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
554 sound file. If the file is a WAV-format file, set up interface
555 functions in S and convert header fields to host byte-order.
556 Value is non-zero if the file is a WAV file. */
558 static int
559 wav_init (s)
560 struct sound *s;
562 struct wav_header *header = (struct wav_header *) s->header;
564 if (s->header_size < sizeof *header
565 || bcmp (s->header, "RIFF", 4) != 0)
566 return 0;
568 /* WAV files are in little-endian order. Convert the header
569 if on a big-endian machine. */
570 header->magic = le2hl (header->magic);
571 header->length = le2hl (header->length);
572 header->chunk_type = le2hl (header->chunk_type);
573 header->chunk_format = le2hl (header->chunk_format);
574 header->chunk_length = le2hl (header->chunk_length);
575 header->format = le2hs (header->format);
576 header->channels = le2hs (header->channels);
577 header->sample_rate = le2hl (header->sample_rate);
578 header->bytes_per_second = le2hl (header->bytes_per_second);
579 header->sample_size = le2hs (header->sample_size);
580 header->precision = le2hs (header->precision);
581 header->chunk_data = le2hl (header->chunk_data);
582 header->data_length = le2hl (header->data_length);
584 /* Set up the interface functions for WAV. */
585 s->type = RIFF;
586 s->play = wav_play;
588 return 1;
592 /* Play RIFF-WAVE audio file S on sound device SD. */
594 static void
595 wav_play (s, sd)
596 struct sound *s;
597 struct sound_device *sd;
599 struct wav_header *header = (struct wav_header *) s->header;
601 /* Let the device choose a suitable device-dependent format
602 for the file. */
603 sd->choose_format (sd, s);
605 /* Configure the device. */
606 sd->sample_size = header->sample_size;
607 sd->sample_rate = header->sample_rate;
608 sd->bps = header->bytes_per_second;
609 sd->channels = header->channels;
610 sd->configure (sd);
612 /* Copy sound data to the device. The WAV file specification is
613 actually more complex. This simple scheme worked with all WAV
614 files I found so far. If someone feels inclined to implement the
615 whole RIFF-WAVE spec, please do. */
616 if (STRINGP (s->data))
617 sd->write (sd, XSTRING (s->data)->data + sizeof *header,
618 STRING_BYTES (XSTRING (s->data)) - sizeof *header);
619 else
621 char *buffer;
622 int nbytes;
623 int blksize = 2048;
625 buffer = (char *) alloca (blksize);
626 lseek (s->fd, sizeof *header, SEEK_SET);
628 while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
629 sd->write (sd, buffer, nbytes);
631 if (nbytes < 0)
632 sound_perror ("Reading sound file");
638 /***********************************************************************
639 Sun Audio (*.au)
640 ***********************************************************************/
642 /* Sun audio file encodings. */
644 enum au_encoding
646 AU_ENCODING_ULAW_8 = 1,
647 AU_ENCODING_8,
648 AU_ENCODING_16,
649 AU_ENCODING_24,
650 AU_ENCODING_32,
651 AU_ENCODING_IEEE32,
652 AU_ENCODING_IEEE64,
653 AU_COMPRESSED = 23
657 /* Try to initialize sound file S from S->header. S->header
658 contains the first MAX_SOUND_HEADER_BYTES number of bytes from the
659 sound file. If the file is a AU-format file, set up interface
660 functions in S and convert header fields to host byte-order.
661 Value is non-zero if the file is an AU file. */
663 static int
664 au_init (s)
665 struct sound *s;
667 struct au_header *header = (struct au_header *) s->header;
669 if (s->header_size < sizeof *header
670 || bcmp (s->header, ".snd", 4) != 0)
671 return 0;
673 header->magic_number = be2hl (header->magic_number);
674 header->data_offset = be2hl (header->data_offset);
675 header->data_size = be2hl (header->data_size);
676 header->encoding = be2hl (header->encoding);
677 header->sample_rate = be2hl (header->sample_rate);
678 header->channels = be2hl (header->channels);
680 /* Set up the interface functions for AU. */
681 s->type = SUN_AUDIO;
682 s->play = au_play;
684 return 1;
688 /* Play Sun audio file S on sound device SD. */
690 static void
691 au_play (s, sd)
692 struct sound *s;
693 struct sound_device *sd;
695 struct au_header *header = (struct au_header *) s->header;
697 sd->sample_size = 0;
698 sd->sample_rate = header->sample_rate;
699 sd->bps = 0;
700 sd->channels = header->channels;
701 sd->choose_format (sd, s);
702 sd->configure (sd);
704 if (STRINGP (s->data))
705 sd->write (sd, XSTRING (s->data)->data + header->data_offset,
706 STRING_BYTES (XSTRING (s->data)) - header->data_offset);
707 else
709 int blksize = 2048;
710 char *buffer;
711 int nbytes;
713 /* Seek */
714 lseek (s->fd, header->data_offset, SEEK_SET);
716 /* Copy sound data to the device. */
717 buffer = (char *) alloca (blksize);
718 while ((nbytes = emacs_read (s->fd, buffer, blksize)) > 0)
719 sd->write (sd, buffer, nbytes);
721 if (nbytes < 0)
722 sound_perror ("Reading sound file");
728 /***********************************************************************
729 Voxware Driver Interface
730 ***********************************************************************/
732 /* This driver is available on GNU/Linux, and the free BSDs. FreeBSD
733 has a compatible own driver aka Luigi's driver. */
736 /* Open device SD. If SD->file is non-null, open that device,
737 otherwise use a default device name. */
739 static void
740 vox_open (sd)
741 struct sound_device *sd;
743 char *file;
745 /* Open the sound device. Default is /dev/dsp. */
746 if (sd->file)
747 file = sd->file;
748 else
749 file = DEFAULT_SOUND_DEVICE;
751 sd->fd = emacs_open (file, O_WRONLY, 0);
752 if (sd->fd < 0)
753 sound_perror (file);
757 /* Configure device SD from parameters in it. */
759 static void
760 vox_configure (sd)
761 struct sound_device *sd;
763 int val;
765 xassert (sd->fd >= 0);
767 val = sd->format;
768 if (ioctl (sd->fd, SNDCTL_DSP_SETFMT, &sd->format) < 0
769 || val != sd->format)
770 sound_perror ("Set sound format");
772 val = sd->channels != 1;
773 if (ioctl (sd->fd, SNDCTL_DSP_STEREO, &val) < 0
774 || val != (sd->channels != 1))
775 sound_perror ("Set stereo/mono");
777 /* I think bps and sampling_rate are the same, but who knows.
778 Check this. and use SND_DSP_SPEED for both. */
779 if (sd->sample_rate > 0)
781 val = sd->sample_rate;
782 if (ioctl (sd->fd, SNDCTL_DSP_SPEED, &sd->sample_rate) < 0
783 || val != sd->sample_rate)
784 sound_perror ("Set sound speed");
787 if (sd->volume > 0)
789 int volume = sd->volume & 0xff;
790 volume |= volume << 8;
791 /* This may fail if there is no mixer. Ignore the failure. */
792 ioctl (sd->fd, SOUND_MIXER_WRITE_PCM, &volume);
797 /* Close device SD if it is open. */
799 static void
800 vox_close (sd)
801 struct sound_device *sd;
803 if (sd->fd >= 0)
805 /* Flush sound data, and reset the device. */
806 ioctl (sd->fd, SNDCTL_DSP_SYNC, NULL);
808 /* Close the device. */
809 emacs_close (sd->fd);
810 sd->fd = -1;
815 /* Choose device-dependent format for device SD from sound file S. */
817 static void
818 vox_choose_format (sd, s)
819 struct sound_device *sd;
820 struct sound *s;
822 if (s->type == RIFF)
824 struct wav_header *h = (struct wav_header *) s->header;
825 if (h->precision == 8)
826 sd->format = AFMT_U8;
827 else if (h->precision == 16)
828 sd->format = AFMT_S16_LE;
829 else
830 error ("Unsupported WAV file format");
832 else if (s->type == SUN_AUDIO)
834 struct au_header *header = (struct au_header *) s->header;
835 switch (header->encoding)
837 case AU_ENCODING_ULAW_8:
838 case AU_ENCODING_IEEE32:
839 case AU_ENCODING_IEEE64:
840 sd->format = AFMT_MU_LAW;
841 break;
843 case AU_ENCODING_8:
844 case AU_ENCODING_16:
845 case AU_ENCODING_24:
846 case AU_ENCODING_32:
847 sd->format = AFMT_S16_LE;
848 break;
850 default:
851 error ("Unsupported AU file format");
854 else
855 abort ();
859 /* Initialize device SD. Set up the interface functions in the device
860 structure. */
862 static void
863 vox_init (sd)
864 struct sound_device *sd;
866 sd->fd = -1;
867 sd->open = vox_open;
868 sd->close = vox_close;
869 sd->configure = vox_configure;
870 sd->choose_format = vox_choose_format;
871 sd->write = vox_write;
875 /* Write NBYTES bytes from BUFFER to device SD. */
877 static void
878 vox_write (sd, buffer, nbytes)
879 struct sound_device *sd;
880 char *buffer;
881 int nbytes;
883 int nwritten = emacs_write (sd->fd, buffer, nbytes);
884 if (nwritten < 0)
885 sound_perror ("Writing to sound device");
890 /***********************************************************************
891 Initialization
892 ***********************************************************************/
894 void
895 syms_of_sound ()
897 QCdevice = intern (":device");
898 staticpro (&QCdevice);
899 QCvolume = intern (":volume");
900 staticpro (&QCvolume);
901 Qsound = intern ("sound");
902 staticpro (&Qsound);
903 Qplay_sound_functions = intern ("play-sound-functions");
904 staticpro (&Qplay_sound_functions);
906 defsubr (&Splay_sound);
910 void
911 init_sound ()
915 #endif /* HAVE_SOUND */