File: sndconfig.c

package info (click to toggle)
cdrkit 9:1.1.11-3
  • links: PTS
  • area: main
  • in suites: bullseye, buster, jessie, jessie-kfreebsd, sid, stretch
  • size: 7,464 kB
  • sloc: ansic: 107,182; perl: 968; sh: 481; makefile: 229; sed: 4
file content (607 lines) | stat: -rw-r--r-- 16,205 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
/*
 * This file has been modified for the cdrkit suite.
 *
 * The behaviour and appearence of the program code below can differ to a major
 * extent from the version distributed by the original author(s).
 *
 * For details, see Changelog file distributed with the cdrkit package. If you
 * received this file from another source then ask the distributing person for
 * a log of modifications.
 *
 */

/* @(#)sndconfig.c	1.17 04/08/03 Copyright 1998-2004 Heiko Eissfeldt */
/* os dependent functions */
#include "config.h"
#include <stdio.h>
#include <stdxlib.h>
#include <strdefs.h>
#include <fctldefs.h>
#include <unixstd.h>
#include <sys/ioctl.h>

#if	!defined __CYGWIN32__
# include <timedefs.h>
#endif
#include <schily.h>


/* soundcard setup */
#if defined (HAVE_SOUNDCARD_H) || defined (HAVE_LINUX_SOUNDCARD_H) || defined (HAVE_SYS_SOUNDCARD_H) || defined (HAVE_MACHINE_SOUNDCARD_H)
# if defined (HAVE_SOUNDCARD_H)
#  include <soundcard.h>
# else
#  if defined (HAVE_MACHINE_SOUNDCARD_H)
#   include <machine/soundcard.h>
#  else
#   if defined (HAVE_SYS_SOUNDCARD_H)
#    include <sys/soundcard.h>
#   else
#    if defined (HAVE_LINUX_SOUNDCARD_H)
#     include <linux/soundcard.h>
#    endif
#   endif
#  endif
# endif
#endif

#include "mytype.h"
#include "byteorder.h"
#include "lowlevel.h"
#include "global.h"
#include "sndconfig.h"

#ifdef	ECHO_TO_SOUNDCARD
#   if defined(__CYGWIN32__)
#      include <windows.h>
#      include "mmsystem.h"
#   endif

#   if	defined(__EMX__)
#      define	INCL_DOS
#      define	INCL_OS2MM
#      include	<os2.h>
#      define	PPFN	_PPFN
#      include	<os2me.h>
#      undef	PPFN
static unsigned long	DeviceID;

#      define	FRAGMENTS	2
/* playlist-structure */
typedef struct {
        ULONG ulCommand;
        ULONG ulOperand1, ulOperand2, ulOperand3;
} PLAYLISTSTRUCTURE;

static PLAYLISTSTRUCTURE PlayList[FRAGMENTS + 1];
static unsigned BufferInd;
#   endif /* defined __EMX__ */

static char snd_device[200] = SOUND_DEV;

int set_snd_device(const char *devicename)
{
	strncpy(snd_device, devicename, sizeof(snd_device));
	return 0;
}

#   if	defined __CYGWIN32__
static HWAVEOUT	DeviceID;
#      define WAVEHDRS	3
static WAVEHDR	wavehdr[WAVEHDRS];
static unsigned lastwav = 0;

static int check_winsound_caps(int bits, double rate, int channels);

static int check_winsound_caps(int bits, double rate, int channels)
{
  int result = 0;

  WAVEOUTCAPS caps;

  /* get caps */
  if (waveOutGetDevCaps(0, &caps, sizeof(caps))) {
     fprintf(stderr, "cannot get soundcard capabilities!\n");
     return 1;
  }

  /* check caps */
  if ((bits == 8 && !(caps.dwFormats & 0x333)) ||
      (bits == 16 && !(caps.dwFormats & 0xccc))) {
      fprintf(stderr, "%d bits sound are not supported\n", bits);
      result = 2;
  }

  if ((channels == 1 && !(caps.dwFormats & 0x555)) ||
      (channels == 2 && !(caps.dwFormats & 0xaaa))) {
      fprintf(stderr, "%d sound channels are not supported\n", channels);
      result = 3;
  }

  if ((rate == 44100.0 && !(caps.dwFormats & 0xf00)) ||
      (rate == 22050.0 && !(caps.dwFormats & 0xf0)) ||
      (rate == 11025.0 && !(caps.dwFormats & 0xf))) {
      fprintf(stderr, "%d sample rate is not supported\n", (int)rate);
      result = 4;
  }

  return result;
}
#   endif /* defined CYGWIN */
#endif /* defined ECHO_TO_SOUNDCARD */

#ifdef	HAVE_SUN_AUDIOIO_H
# include <sun/audioio.h>
#endif
#ifdef	HAVE_SYS_AUDIOIO_H
# include <sys/audioio.h>
#endif

#ifdef	HAVE_SYS_ASOUNDLIB_H
# include <sys/asoundlib.h>
snd_pcm_t	*pcm_handle;
#endif

#if	defined	HAVE_OSS && defined SNDCTL_DSP_GETOSPACE
audio_buf_info abinfo;
#endif

int init_soundcard(double rate, int bits)
{
#ifdef	ECHO_TO_SOUNDCARD
  if (global.echo) {
# if	defined(HAVE_OSS) && HAVE_OSS == 1
    if (open_snd_device() != 0) {
        errmsg("Cannot open sound device '%s'\n", snd_device);
        global.echo = 0;
    } else { 
	/* This the sound device initialisation for 4front Open sound drivers */

	int dummy;
	int garbled_rate = rate;
	int stereo = (global.channels == 2);
	int myformat = bits == 8 ? AFMT_U8 :
        	(MY_LITTLE_ENDIAN ? AFMT_S16_LE : AFMT_S16_BE);
	int mask;

	if (ioctl(global.soundcard_fd, (int)SNDCTL_DSP_GETBLKSIZE, &dummy) == -1) {
	    fprintf(stderr, "Cannot get blocksize for %s\n", snd_device);
	    global.echo = 0;
	}
	if (ioctl(global.soundcard_fd, (int)SNDCTL_DSP_SYNC, NULL) == -1) {
	    fprintf(stderr, "Cannot sync for %s\n", snd_device);
	    global.echo = 0;
	}

#if	defined SNDCTL_DSP_GETOSPACE
	if (ioctl(global.soundcard_fd, SNDCTL_DSP_GETOSPACE, &abinfo) == -1) {
		fprintf(stderr, "Cannot get input buffersize for %s\n", snd_device);
		abinfo.fragments  = 0;
	}
#endif

	/* check, if the sound device can do the requested format */
	if (ioctl(global.soundcard_fd, (int)SNDCTL_DSP_GETFMTS, &mask) == -1) {
		perror("fatal error:");
		return -1;
	}
	if ((mask & myformat) == 0) {
		fprintf(stderr, "sound format (%d bits signed) is not available\n", bits);
		if ((mask & AFMT_U8) != 0) {
			bits = 8;
			myformat = AFMT_U8;
		}
	}
	if (ioctl(global.soundcard_fd, (int)SNDCTL_DSP_SETFMT, &myformat) == -1) {
	    fprintf(stderr, "Cannot set %d bits/sample for %s\n",bits, snd_device);
	    global.echo = 0;
	}

	/* limited sound devices may not support stereo */
	if (stereo
	    && ioctl(global.soundcard_fd, (int)SNDCTL_DSP_STEREO, &stereo) == -1) {
	    fprintf(stderr, "Cannot set stereo mode for %s\n", snd_device);
	    stereo = 0;
	}
	if (!stereo
            && ioctl(global.soundcard_fd, (int)SNDCTL_DSP_STEREO, &stereo) == -1) {
	    fprintf(stderr, "Cannot set mono mode for %s\n", snd_device);
	    global.echo = 0;
	}

	/* set the sample rate */
	if (ioctl(global.soundcard_fd, (int)SNDCTL_DSP_SPEED, &garbled_rate) == -1) {
	    fprintf(stderr, "Cannot set rate %d.%2d Hz for %s\n",
		(int)rate, (int)(rate*100)%100, snd_device);
	    global.echo = 0;
	}
	if ( abs((long)rate - garbled_rate) > rate / 20) {
	    fprintf(stderr, "sound device: next best sample rate is %d\n",garbled_rate);
	}
    }

# else /* HAVE_OSS */

#  if defined	HAVE_SYS_AUDIOIO_H || defined HAVE_SUN_AUDIOIO_H
	/* This is the SunOS / Solaris and compatibles sound initialisation */

    if ((global.soundcard_fd = open(snd_device, O_WRONLY, 0)) == EOF) {
	perror("");
        fprintf(stderr, "Cannot open %s\n",snd_device);
        global.echo = 0;
    } else { 

        audio_info_t            info;

#   if	defined	(AUDIO_INITINFO) && defined (AUDIO_ENCODING_LINEAR)
        AUDIO_INITINFO(&info);
        info.play.sample_rate = rate;
        info.play.channels = global.channels;
        info.play.precision = bits;
        info.play.encoding = AUDIO_ENCODING_LINEAR;
        info.play.pause = 0;
        info.record.pause = 0;
        info.monitor_gain = 0;
        if (ioctl(global.soundcard_fd, AUDIO_SETINFO, &info) < 0) {
	    fprintf(stderr, "Cannot init %s (sun)\n", snd_device);
	    global.echo = 0;
	}
#   else
	fprintf(stderr, "Cannot init sound device with 44.1 KHz sample rate on %s (sun compatible)\n", snd_device);
	global.echo = 0;
#   endif
    }
#  else /* SUN audio */
#   if defined(__CYGWIN32__)
    /* Windows sound info */

    MMRESULT mmres;
    WAVEFORMATEX wavform;

    if (waveOutGetNumDevs() < 1) {
	fprintf( stderr, "no sound devices available!\n");
	global.echo = 0;
	return 1;
    }

    /* check capabilities */
    if (check_winsound_caps(bits, rate, global.channels) != 0) {
	fprintf( stderr, "soundcard capabilities are not sufficient!\n");
	global.echo = 0;
	return 1;
    }

    wavform.wFormatTag = WAVE_FORMAT_PCM;
    wavform.nChannels = global.channels;
    wavform.nSamplesPerSec = (int)rate;
    wavform.wBitsPerSample = bits;
    wavform.cbSize = sizeof(wavform);
    wavform.nAvgBytesPerSec = (int)rate * global.channels *
				(wavform.wBitsPerSample / 8);
    wavform.nBlockAlign = global.channels * (wavform.wBitsPerSample / 8);
  
    DeviceID = 0;
    mmres = waveOutOpen(&DeviceID, WAVE_MAPPER, &wavform, (unsigned long)WIN_CallBack, 0, CALLBACK_FUNCTION);
    if (mmres) {
	char erstr[329];

	waveOutGetErrorText(mmres, erstr, sizeof(erstr));
	fprintf( stderr, "soundcard open error: %s!\n", erstr);
	global.echo = 0;
	return 1;
    }

    global.soundcard_fd = 0;

    /* init all wavehdrs */
    { int i;
	for (i=0; i < WAVEHDRS; i++) {
	    wavehdr[i].dwBufferLength = (global.channels*(bits/ 8)*(int)rate*
		    		global.nsectors)/75;
	    wavehdr[i].lpData = malloc(wavehdr[i].dwBufferLength);
	    if (wavehdr[i].lpData == NULL) {
		    fprintf(stderr, "no memory for sound buffers available\n");
 		    waveOutReset(0);
		    waveOutClose(DeviceID);
		    return 1;
	    }
	    
	    mmres = waveOutPrepareHeader(DeviceID, &wavehdr[i], sizeof(WAVEHDR));
	    if (mmres) {
		char erstr[129];

		waveOutGetErrorText(mmres, erstr, sizeof(erstr));
		fprintf( stderr, "soundcard prepare error: %s!\n", erstr);
		return 1;
	    }

	    wavehdr[i].dwLoops = 0;
	    wavehdr[i].dwFlags = WHDR_DONE;
	    wavehdr[i].dwBufferLength = 0;
	}
    }

#   else
#    if defined(__EMX__)
#	if defined (HAVE_MMPM)
    /* OS/2 MMPM/2 MCI sound info */

    MCI_OPEN_PARMS mciOpenParms;
    int i;

    /* create playlist */
    for (i = 0; i < FRAGMENTS; i++) {
        PlayList[i].ulCommand = DATA_OPERATION; /* play data */
        PlayList[i].ulOperand1 = 0;	/* address */
        PlayList[i].ulOperand2 = 0;	/* size */
        PlayList[i].ulOperand3 = 0;     /* offset */
    }
    PlayList[FRAGMENTS].ulCommand = BRANCH_OPERATION;       /* jump */
    PlayList[FRAGMENTS].ulOperand1 = 0;
    PlayList[FRAGMENTS].ulOperand2 = 0;     /* destination */
    PlayList[FRAGMENTS].ulOperand3 = 0;

    memset(&mciOpenParms, 0, sizeof(mciOpenParms));
    mciOpenParms.pszDeviceType = (PSZ) (((unsigned long) MCI_DEVTYPE_WAVEFORM_AUDIO << 16) | (unsigned short) DeviceIndex);
    mciOpenParms.pszElementName = (PSZ) & PlayList;

    /* try to open the sound device */
    if (mciSendCommand(0, MCI_OPEN,
	 MCI_WAIT | MCI_OPEN_SHAREABLE | MCIOPEN_Type_ID, &mciOpenParms, 0)
	 != MCIERR_SUCCESS) {
	/* no sound */
	fprintf( stderr, "no sound devices available!\n");
	global.echo = 0;
	return 1;
    }
    /* try to set the parameters */
    DeviceID = mciOpenParms.usDeviceID;

    {
	MCI_WAVE_SET_PARMS mciWaveSetParms;

	memset(&mciWaveSetParms, 0, sizeof(mciWaveSetParms));
	mciWaveSetParms.ulSamplesPerSec = rate;
	mciWaveSetParms.usBitsPerSample = bits;
	mciWaveSetParms.usChannels = global.channels;
	mciWaveSetParms.ulAudio = MCI_SET_AUDIO_ALL;

	/* set play-parameters */
	if (mciSendCommand(DeviceID, MCI_SET,
			MCI_WAIT | MCI_WAVE_SET_SAMPLESPERSEC |
			MCI_WAVE_SET_BITSPERSAMPLE | MCI_WAVE_SET_CHANNELS,
			(PVOID) & mciWaveSetParms, 0)) {
		MCI_GENERIC_PARMS mciGenericParms;
		fprintf( stderr, "soundcard capabilities are not sufficient!\n");
		global.echo = 0;
		/* close */
		mciSendCommand(DeviceID, MCI_CLOSE, MCI_WAIT, &mciGenericParms, 0);
		return 1;
	}
    }

#       endif /* EMX MMPM OS2 sound */
#    else
#      if defined(__QNX__)

	int	card = -1;
	int	dev = 0;
	int	rtn;
	snd_pcm_channel_info_t	pi;
	snd_pcm_channel_params_t	pp;

	if (card == -1) {
		rtn = snd_pcm_open_preferred(&pcm_handle, 
			&card, &dev, SND_PCM_OPEN_PLAYBACK);
		if (rtn < 0) {
			perror("sound device open");
			return 1;
		}
	} else {
		rtn = snd_pcm_open(&pcm_handle, 
			card, dev, SND_PCM_OPEN_PLAYBACK);
		if (rtn < 0) {
			perror("sound device open");
			return 1;
		}
	}

	memset(&pi, 0, sizeof(pi));
	pi.channel = SND_PCM_CHANNEL_PLAYBACK;
	rtn = snd_pcm_plugin_info(pcm_handle, &pi);
	if (rtn < 0) {
		fprintf(stderr, "snd_pcm_plugin_info failed: %s\n", snd_strerror(rtn));
		return 1;
	}

	memset(&pp, 0, sizeof(pp));
	pp.mode = SND_PCM_MODE_BLOCK;
	pp.channel = SND_PCM_CHANNEL_PLAYBACK;
	pp.start_mode = SND_PCM_START_FULL;
	pp.stop_mode = SND_PCM_STOP_STOP;

	pp.buf.block.frag_size = pi.max_fragment_size;
	pp.buf.block.frags_max = 1;
	pp.buf.block.frags_min = 1;

	pp.format.interleave = 1;
	pp.format.rate = rate;
	pp.format.voices = global.channels;
	if (bits == 8) {
		pp.format.format = SND_PCM_SFMT_U8;
	} else {
		pp.format.format = SND_PCM_SFMT_S16_LE;
	}

	rtn = snd_pcm_plugin_params(pcm_handle, &pp);
	if (rtn < 0) {
		fprintf(stderr, "snd_pcm_plugin_params failed: %s\n", snd_strerror(rtn));
		return 1;
	}

	rtn = snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK);
	if (rtn < 0) {
		fprintf(stderr, "snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rtn));
		return 1;
	}

	global.soundcard_fd = snd_pcm_file_descriptor(pcm_handle, SND_PCM_CHANNEL_PLAYBACK);

#      endif /* QNX sound */
#    endif /* EMX OS2 sound */
#   endif /* CYGWIN Windows sound */
#  endif /* else SUN audio */
# endif /* else HAVE_OSS */
  }
#endif /* ifdef ECHO_TO_SOUNDCARD */
  return 0;
}

int open_snd_device()
{
#if	defined(F_GETFL) && defined(F_SETFL) && defined(O_NONBLOCK)
	int	fl;
#endif

#if	defined ECHO_TO_SOUNDCARD && !defined __CYGWIN32__ && !defined __EMX__
	global.soundcard_fd = open(snd_device, O_WRONLY
#ifdef	linux
		/* Linux BUG: the sound driver open() blocks, if the device is in use. */
		 | O_NONBLOCK
#endif
		, 0);

#if	defined(F_GETFL) && defined(F_SETFL) && defined(O_NONBLOCK)
	fl = fcntl(global.soundcard_fd, F_GETFL, 0);
	fl &= ~O_NONBLOCK;
	fcntl(global.soundcard_fd, F_SETFL, fl);
#endif

	return (global.soundcard_fd < 0);
#else
	return 0;
#endif
}

int close_snd_device ()
{
#if	!defined ECHO_TO_SOUNDCARD
	return 0;
#else

# if	defined __CYGWIN32__
	waveOutReset(0);
	return waveOutClose(DeviceID);
# else /* !Cygwin32 */

#  if	defined __EMX__
#   if	defined HAVE_MMPM
	/* close the sound device */
	MCI_GENERIC_PARMS mciGenericParms;
	mciSendCommand(DeviceID, MCI_CLOSE, MCI_WAIT, &mciGenericParms, 0);
#   else /* HAVE_MMPM */
	return 0;
#   endif /* HAVE_MMPM */
#  else /* !EMX */
#   if	defined	__QNX__
	snd_pcm_plugin_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK);
	return snd_pcm_close(pcm_handle);
#   else /* !QNX */
	return close(global.soundcard_fd);
#   endif /* !QNX */
#  endif /* !EMX */
# endif /* !Cygwin32 */
#endif /* ifdef ECHO_TO_SOUNDCARD */
}

int write_snd_device(char *buffer, unsigned todo)
{
	int result = 0;
#ifdef	ECHO_TO_SOUNDCARD
#if	defined __CYGWIN32__
	MMRESULT mmres;

	wavehdr[lastwav].dwBufferLength = todo;
	memcpy(wavehdr[lastwav].lpData, buffer, todo);

	mmres = waveOutWrite(DeviceID, &wavehdr[lastwav], sizeof(WAVEHDR));
	if (mmres) {
		char erstr[129];

		waveOutGetErrorText(mmres, erstr, sizeof(erstr));
		fprintf( stderr, "soundcard write error: %s!\n", erstr);
		return 1;
	}
	if (++lastwav >= WAVEHDRS)
		 lastwav -= WAVEHDRS;
	result = mmres;
#else
#if	defined __EMX__
	Playlist[BufferInd].ulOperand1 = buffer;
	Playlist[BufferInd].ulOperand2 = todo;
	Playlist[BufferInd].ulOperand3 = 0;
	if (++BufferInd >= FRAGMENTS)
		BufferInd -= FRAGMENTS;

	/* no MCI_WAIT here, because application program has to continue */
	memset(&mciPlayParms, 0, sizeof(mciPlayParms));
	if (mciSendCommand(DeviceID, MCI_PLAY, MCI_FROM, &mciPlayParms, 0)) {
		fprintf( stderr, "soundcard write error: %s!\n", erstr);
		return 1;
	}
	result = 0;
#else
	int retval2;
	int towrite;

#if	defined	HAVE_OSS && defined SNDCTL_DSP_GETOSPACE
	towrite = abinfo.fragments * abinfo.fragsize;
	if (towrite == 0)
#endif
	towrite = todo;
	do {
		fd_set writefds[1];
		struct timeval timeout2;
		int wrote;

		timeout2.tv_sec = 0;
		timeout2.tv_usec = 4*120000;

		FD_ZERO(writefds);
		FD_SET(global.soundcard_fd, writefds);
		retval2 = select(global.soundcard_fd + 1,
				 NULL, writefds, NULL, &timeout2);
		switch (retval2) {
			default:
			case -1: perror ("select failed");
			/* fall through */
			case 0: /* timeout */
				result = 2;
				goto outside_loop;
			case 1: break;
		}
		if (towrite > todo) {
			towrite = todo;
		}
#if		defined __QNX__ && defined HAVE_SYS_ASOUNDLIB_H
		wrote = snd_pcm_plugin_write(pcm_handle, buffer, towrite);
#else
		wrote = write(global.soundcard_fd, buffer, towrite);
#endif
		if (wrote <= 0) {
			perror( "cant write audio");
			result = 1;
			goto outside_loop;
		} else {
			todo -= wrote;
			buffer += wrote;
		}
	} while (todo > 0);
outside_loop:
	;
#endif	/* !defined __EMX__ */
#endif	/* !defined __CYGWIN32__ */
#endif	/* ECHO_TO_SOUNDCARD */
	return result;
}