aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/OssOutputPlugin.cxx
blob: cdde6d5627cb9f885679f26e1dafb5603a61bd1a (plain) (blame)
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
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "OssOutputPlugin.hxx"
#include "OutputAPI.hxx"
#include "MixerList.hxx"
#include "system/fd_util.h"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "util/Macros.hxx"
#include "system/ByteOrder.hxx"
#include "Log.hxx"

#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>

#if defined(__OpenBSD__) || defined(__NetBSD__)
# include <soundcard.h>
#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
# include <sys/soundcard.h>
#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */

/* We got bug reports from FreeBSD users who said that the two 24 bit
   formats generate white noise on FreeBSD, but 32 bit works.  This is
   a workaround until we know what exactly is expected by the kernel
   audio drivers. */
#ifndef __linux__
#undef AFMT_S24_PACKED
#undef AFMT_S24_NE
#endif

#ifdef AFMT_S24_PACKED
#include "pcm/PcmExport.hxx"
#include "util/Manual.hxx"
#endif

struct OssOutput {
	struct audio_output base;

#ifdef AFMT_S24_PACKED
	Manual<PcmExport> pcm_export;
#endif

	int fd;
	const char *device;

	/**
	 * The current input audio format.  This is needed to reopen
	 * the device after cancel().
	 */
	AudioFormat audio_format;

	/**
	 * The current OSS audio format.  This is needed to reopen the
	 * device after cancel().
	 */
	int oss_format;

	OssOutput():fd(-1), device(nullptr) {}

	bool Initialize(const config_param &param, Error &error_r) {
		return ao_base_init(&base, &oss_output_plugin, param,
				    error_r);
	}

	void Deinitialize() {
		ao_base_finish(&base);
	}
};

static constexpr Domain oss_output_domain("oss_output");

enum oss_stat {
	OSS_STAT_NO_ERROR = 0,
	OSS_STAT_NOT_CHAR_DEV = -1,
	OSS_STAT_NO_PERMS = -2,
	OSS_STAT_DOESN_T_EXIST = -3,
	OSS_STAT_OTHER = -4,
};

static enum oss_stat
oss_stat_device(const char *device, int *errno_r)
{
	struct stat st;

	if (0 == stat(device, &st)) {
		if (!S_ISCHR(st.st_mode)) {
			return OSS_STAT_NOT_CHAR_DEV;
		}
	} else {
		*errno_r = errno;

		switch (errno) {
		case ENOENT:
		case ENOTDIR:
			return OSS_STAT_DOESN_T_EXIST;
		case EACCES:
			return OSS_STAT_NO_PERMS;
		default:
			return OSS_STAT_OTHER;
		}
	}

	return OSS_STAT_NO_ERROR;
}

static const char *default_devices[] = { "/dev/sound/dsp", "/dev/dsp" };

static bool
oss_output_test_default_device(void)
{
	int fd, i;

	for (i = ARRAY_SIZE(default_devices); --i >= 0; ) {
		fd = open_cloexec(default_devices[i], O_WRONLY, 0);

		if (fd >= 0) {
			close(fd);
			return true;
		}

		FormatErrno(oss_output_domain,
			    "Error opening OSS device \"%s\"",
			    default_devices[i]);
	}

	return false;
}

static struct audio_output *
oss_open_default(Error &error)
{
	int err[ARRAY_SIZE(default_devices)];
	enum oss_stat ret[ARRAY_SIZE(default_devices)];

	const config_param empty;
	for (int i = ARRAY_SIZE(default_devices); --i >= 0; ) {
		ret[i] = oss_stat_device(default_devices[i], &err[i]);
		if (ret[i] == OSS_STAT_NO_ERROR) {
			OssOutput *od = new OssOutput();
			if (!od->Initialize(empty, error)) {
				delete od;
				return NULL;
			}

			od->device = default_devices[i];
			return &od->base;
		}
	}

	for (int i = ARRAY_SIZE(default_devices); --i >= 0; ) {
		const char *dev = default_devices[i];
		switch(ret[i]) {
		case OSS_STAT_NO_ERROR:
			/* never reached */
			break;
		case OSS_STAT_DOESN_T_EXIST:
			FormatWarning(oss_output_domain,
				      "%s not found", dev);
			break;
		case OSS_STAT_NOT_CHAR_DEV:
			FormatWarning(oss_output_domain,
				      "%s is not a character device", dev);
			break;
		case OSS_STAT_NO_PERMS:
			FormatWarning(oss_output_domain,
				      "%s: permission denied", dev);
			break;
		case OSS_STAT_OTHER:
			FormatErrno(oss_output_domain, err[i],
				    "Error accessing %s", dev);
		}
	}

	error.Set(oss_output_domain,
		  "error trying to open default OSS device");
	return NULL;
}

static struct audio_output *
oss_output_init(const config_param &param, Error &error)
{
	const char *device = param.GetBlockValue("device");
	if (device != NULL) {
		OssOutput *od = new OssOutput();
		if (!od->Initialize(param, error)) {
			delete od;
			return NULL;
		}

		od->device = device;
		return &od->base;
	}

	return oss_open_default(error);
}

static void
oss_output_finish(struct audio_output *ao)
{
	OssOutput *od = (OssOutput *)ao;

	ao_base_finish(&od->base);
	delete od;
}

#ifdef AFMT_S24_PACKED

static bool
oss_output_enable(struct audio_output *ao, gcc_unused Error &error)
{
	OssOutput *od = (OssOutput *)ao;

	od->pcm_export.Construct();
	return true;
}

static void
oss_output_disable(struct audio_output *ao)
{
	OssOutput *od = (OssOutput *)ao;

	od->pcm_export.Destruct();
}

#endif

static void
oss_close(OssOutput *od)
{
	if (od->fd >= 0)
		close(od->fd);
	od->fd = -1;
}

/**
 * A tri-state type for oss_try_ioctl().
 */
enum oss_setup_result {
	SUCCESS,
	ERROR,
	UNSUPPORTED,
};

/**
 * Invoke an ioctl on the OSS file descriptor.  On success, SUCCESS is
 * returned.  If the parameter is not supported, UNSUPPORTED is
 * returned.  Any other failure returns ERROR and allocates an #Error.
 */
static enum oss_setup_result
oss_try_ioctl_r(int fd, unsigned long request, int *value_r,
		const char *msg, Error &error)
{
	assert(fd >= 0);
	assert(value_r != NULL);
	assert(msg != NULL);
	assert(!error.IsDefined());

	int ret = ioctl(fd, request, value_r);
	if (ret >= 0)
		return SUCCESS;

	if (errno == EINVAL)
		return UNSUPPORTED;

	error.SetErrno(msg);
	return ERROR;
}

/**
 * Invoke an ioctl on the OSS file descriptor.  On success, SUCCESS is
 * returned.  If the parameter is not supported, UNSUPPORTED is
 * returned.  Any other failure returns ERROR and allocates an #Error.
 */
static enum oss_setup_result
oss_try_ioctl(int fd, unsigned long request, int value,
	      const char *msg, Error &error_r)
{
	return oss_try_ioctl_r(fd, request, &value, msg, error_r);
}

/**
 * Set up the channel number, and attempts to find alternatives if the
 * specified number is not supported.
 */
static bool
oss_setup_channels(int fd, AudioFormat &audio_format, Error &error)
{
	const char *const msg = "Failed to set channel count";
	int channels = audio_format.channels;
	enum oss_setup_result result =
		oss_try_ioctl_r(fd, SNDCTL_DSP_CHANNELS, &channels, msg, error);
	switch (result) {
	case SUCCESS:
		if (!audio_valid_channel_count(channels))
		    break;

		audio_format.channels = channels;
		return true;

	case ERROR:
		return false;

	case UNSUPPORTED:
		break;
	}

	for (unsigned i = 1; i < 2; ++i) {
		if (i == audio_format.channels)
			/* don't try that again */
			continue;

		channels = i;
		result = oss_try_ioctl_r(fd, SNDCTL_DSP_CHANNELS, &channels,
					 msg, error);
		switch (result) {
		case SUCCESS:
			if (!audio_valid_channel_count(channels))
			    break;

			audio_format.channels = channels;
			return true;

		case ERROR:
			return false;

		case UNSUPPORTED:
			break;
		}
	}

	error.Set(oss_output_domain, msg);
	return false;
}

/**
 * Set up the sample rate, and attempts to find alternatives if the
 * specified sample rate is not supported.
 */
static bool
oss_setup_sample_rate(int fd, AudioFormat &audio_format,
		      Error &error)
{
	const char *const msg = "Failed to set sample rate";
	int sample_rate = audio_format.sample_rate;
	enum oss_setup_result result =
		oss_try_ioctl_r(fd, SNDCTL_DSP_SPEED, &sample_rate,
				msg, error);
	switch (result) {
	case SUCCESS:
		if (!audio_valid_sample_rate(sample_rate))
			break;

		audio_format.sample_rate = sample_rate;
		return true;

	case ERROR:
		return false;

	case UNSUPPORTED:
		break;
	}

	static const int sample_rates[] = { 48000, 44100, 0 };
	for (unsigned i = 0; sample_rates[i] != 0; ++i) {
		sample_rate = sample_rates[i];
		if (sample_rate == (int)audio_format.sample_rate)
			continue;

		result = oss_try_ioctl_r(fd, SNDCTL_DSP_SPEED, &sample_rate,
					 msg, error);
		switch (result) {
		case SUCCESS:
			if (!audio_valid_sample_rate(sample_rate))
				break;

			audio_format.sample_rate = sample_rate;
			return true;

		case ERROR:
			return false;

		case UNSUPPORTED:
			break;
		}
	}

	error.Set(oss_output_domain, msg);
	return false;
}

/**
 * Convert a MPD sample format to its OSS counterpart.  Returns
 * AFMT_QUERY if there is no direct counterpart.
 */
static int
sample_format_to_oss(SampleFormat format)
{
	switch (format) {
	case SampleFormat::UNDEFINED:
	case SampleFormat::FLOAT:
	case SampleFormat::DSD:
		return AFMT_QUERY;

	case SampleFormat::S8:
		return AFMT_S8;

	case SampleFormat::S16:
		return AFMT_S16_NE;

	case SampleFormat::S24_P32:
#ifdef AFMT_S24_NE
		return AFMT_S24_NE;
#else
		return AFMT_QUERY;
#endif

	case SampleFormat::S32:
#ifdef AFMT_S32_NE
		return AFMT_S32_NE;
#else
		return AFMT_QUERY;
#endif
	}

	return AFMT_QUERY;
}

/**
 * Convert an OSS sample format to its MPD counterpart.  Returns
 * SampleFormat::UNDEFINED if there is no direct counterpart.
 */
static SampleFormat
sample_format_from_oss(int format)
{
	switch (format) {
	case AFMT_S8:
		return SampleFormat::S8;

	case AFMT_S16_NE:
		return SampleFormat::S16;

#ifdef AFMT_S24_PACKED
	case AFMT_S24_PACKED:
		return SampleFormat::S24_P32;
#endif

#ifdef AFMT_S24_NE
	case AFMT_S24_NE:
		return SampleFormat::S24_P32;
#endif

#ifdef AFMT_S32_NE
	case AFMT_S32_NE:
		return SampleFormat::S32;
#endif

	default:
		return SampleFormat::UNDEFINED;
	}
}

/**
 * Probe one sample format.
 *
 * @return the selected sample format or SampleFormat::UNDEFINED on
 * error
 */
static enum oss_setup_result
oss_probe_sample_format(int fd, SampleFormat sample_format,
			SampleFormat *sample_format_r,
			int *oss_format_r,
#ifdef AFMT_S24_PACKED
			PcmExport &pcm_export,
#endif
			Error &error)
{
	int oss_format = sample_format_to_oss(sample_format);
	if (oss_format == AFMT_QUERY)
		return UNSUPPORTED;

	enum oss_setup_result result =
		oss_try_ioctl_r(fd, SNDCTL_DSP_SAMPLESIZE,
				&oss_format,
				"Failed to set sample format", error);

#ifdef AFMT_S24_PACKED
	if (result == UNSUPPORTED && sample_format == SampleFormat::S24_P32) {
		/* if the driver doesn't support padded 24 bit, try
		   packed 24 bit */
		oss_format = AFMT_S24_PACKED;
		result = oss_try_ioctl_r(fd, SNDCTL_DSP_SAMPLESIZE,
					 &oss_format,
					 "Failed to set sample format", error);
	}
#endif

	if (result != SUCCESS)
		return result;

	sample_format = sample_format_from_oss(oss_format);
	if (sample_format == SampleFormat::UNDEFINED)
		return UNSUPPORTED;

	*sample_format_r = sample_format;
	*oss_format_r = oss_format;

#ifdef AFMT_S24_PACKED
	pcm_export.Open(sample_format, 0, false, false,
			oss_format == AFMT_S24_PACKED,
			oss_format == AFMT_S24_PACKED &&
			!IsLittleEndian());
#endif

	return SUCCESS;
}

/**
 * Set up the sample format, and attempts to find alternatives if the
 * specified format is not supported.
 */
static bool
oss_setup_sample_format(int fd, AudioFormat &audio_format,
			int *oss_format_r,
#ifdef AFMT_S24_PACKED
			PcmExport &pcm_export,
#endif
			Error &error)
{
	SampleFormat mpd_format;
	enum oss_setup_result result =
		oss_probe_sample_format(fd, audio_format.format,
					&mpd_format, oss_format_r,
#ifdef AFMT_S24_PACKED
					pcm_export,
#endif
					error);
	switch (result) {
	case SUCCESS:
		audio_format.format = mpd_format;
		return true;

	case ERROR:
		return false;

	case UNSUPPORTED:
		break;
	}

	if (result != UNSUPPORTED)
		return result == SUCCESS;

	/* the requested sample format is not available - probe for
	   other formats supported by MPD */

	static const SampleFormat sample_formats[] = {
		SampleFormat::S24_P32,
		SampleFormat::S32,
		SampleFormat::S16,
		SampleFormat::S8,
		SampleFormat::UNDEFINED /* sentinel */
	};

	for (unsigned i = 0; sample_formats[i] != SampleFormat::UNDEFINED; ++i) {
		mpd_format = sample_formats[i];
		if (mpd_format == audio_format.format)
			/* don't try that again */
			continue;

		result = oss_probe_sample_format(fd, mpd_format,
						 &mpd_format, oss_format_r,
#ifdef AFMT_S24_PACKED
						 pcm_export,
#endif
						 error);
		switch (result) {
		case SUCCESS:
			audio_format.format = mpd_format;
			return true;

		case ERROR:
			return false;

		case UNSUPPORTED:
			break;
		}
	}

	error.Set(oss_output_domain, "Failed to set sample format");
	return false;
}

/**
 * Sets up the OSS device which was opened before.
 */
static bool
oss_setup(OssOutput *od, AudioFormat &audio_format,
	  Error &error)
{
	return oss_setup_channels(od->fd, audio_format, error) &&
		oss_setup_sample_rate(od->fd, audio_format, error) &&
		oss_setup_sample_format(od->fd, audio_format, &od->oss_format,
#ifdef AFMT_S24_PACKED
					od->pcm_export,
#endif
					error);
}

/**
 * Reopen the device with the saved audio_format, without any probing.
 */
static bool
oss_reopen(OssOutput *od, Error &error)
{
	assert(od->fd < 0);

	od->fd = open_cloexec(od->device, O_WRONLY, 0);
	if (od->fd < 0) {
		error.FormatErrno("Error opening OSS device \"%s\"",
				  od->device);
		return false;
	}

	enum oss_setup_result result;

	const char *const msg1 = "Failed to set channel count";
	result = oss_try_ioctl(od->fd, SNDCTL_DSP_CHANNELS,
			       od->audio_format.channels, msg1, error);
	if (result != SUCCESS) {
		oss_close(od);
		if (result == UNSUPPORTED)
			error.Set(oss_output_domain, msg1);
		return false;
	}

	const char *const msg2 = "Failed to set sample rate";
	result = oss_try_ioctl(od->fd, SNDCTL_DSP_SPEED,
			       od->audio_format.sample_rate, msg2, error);
	if (result != SUCCESS) {
		oss_close(od);
		if (result == UNSUPPORTED)
			error.Set(oss_output_domain, msg2);
		return false;
	}

	const char *const msg3 = "Failed to set sample format";
	result = oss_try_ioctl(od->fd, SNDCTL_DSP_SAMPLESIZE,
			       od->oss_format,
			       msg3, error);
	if (result != SUCCESS) {
		oss_close(od);
		if (result == UNSUPPORTED)
			error.Set(oss_output_domain, msg3);
		return false;
	}

	return true;
}

static bool
oss_output_open(struct audio_output *ao, AudioFormat &audio_format,
		Error &error)
{
	OssOutput *od = (OssOutput *)ao;

	od->fd = open_cloexec(od->device, O_WRONLY, 0);
	if (od->fd < 0) {
		error.FormatErrno("Error opening OSS device \"%s\"",
				  od->device);
		return false;
	}

	if (!oss_setup(od, audio_format, error)) {
		oss_close(od);
		return false;
	}

	od->audio_format = audio_format;
	return true;
}

static void
oss_output_close(struct audio_output *ao)
{
	OssOutput *od = (OssOutput *)ao;

	oss_close(od);
}

static void
oss_output_cancel(struct audio_output *ao)
{
	OssOutput *od = (OssOutput *)ao;

	if (od->fd >= 0) {
		ioctl(od->fd, SNDCTL_DSP_RESET, 0);
		oss_close(od);
	}
}

static size_t
oss_output_play(struct audio_output *ao, const void *chunk, size_t size,
		Error &error)
{
	OssOutput *od = (OssOutput *)ao;
	ssize_t ret;

	assert(size > 0);

	/* reopen the device since it was closed by dropBufferedAudio */
	if (od->fd < 0 && !oss_reopen(od, error))
		return 0;

#ifdef AFMT_S24_PACKED
	chunk = od->pcm_export->Export(chunk, size, size);
#endif

	assert(size > 0);

	while (true) {
		ret = write(od->fd, chunk, size);
		if (ret > 0) {
#ifdef AFMT_S24_PACKED
			ret = od->pcm_export->CalcSourceSize(ret);
#endif
			return ret;
		}

		if (ret < 0 && errno != EINTR) {
			error.FormatErrno("Write error on %s", od->device);
			return 0;
		}
	}
}

const struct audio_output_plugin oss_output_plugin = {
	"oss",
	oss_output_test_default_device,
	oss_output_init,
	oss_output_finish,
#ifdef AFMT_S24_PACKED
	oss_output_enable,
	oss_output_disable,
#else
	nullptr,
	nullptr,
#endif
	oss_output_open,
	oss_output_close,
	nullptr,
	nullptr,
	oss_output_play,
	nullptr,
	oss_output_cancel,
	nullptr,

	&oss_mixer_plugin,
};