aboutsummaryrefslogtreecommitdiffstats
path: root/src/volume.c
blob: 8d497ed44cbfbdb126270b1a1fc6763e6ff42882 (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
/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "volume.h"

#include "conf.h"
#include "log.h"
#include "player_control.h"
#include "utils.h"
#include "idle.h"
#include "pcm_utils.h"
#include "os_compat.h"

#include "../config.h"

#include <glib.h>

#ifdef HAVE_OSS
#include <sys/soundcard.h>
#endif
#ifdef HAVE_ALSA
#include <alsa/asoundlib.h>
#endif

#define VOLUME_MIXER_TYPE_SOFTWARE		0
#define VOLUME_MIXER_TYPE_OSS			1
#define VOLUME_MIXER_TYPE_ALSA			2

#define VOLUME_MIXER_SOFTWARE_DEFAULT		""
#define VOLUME_MIXER_OSS_DEFAULT		"/dev/mixer"
#define VOLUME_MIXER_ALSA_DEFAULT		"default"
#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT	"PCM"
#define SW_VOLUME_STATE                         "sw_volume: "

#ifdef HAVE_OSS
#define VOLUME_MIXER_TYPE_DEFAULT               VOLUME_MIXER_TYPE_OSS
#define VOLUME_MIXER_DEVICE_DEFAULT             VOLUME_MIXER_OSS_DEFAULT
#else
#ifdef HAVE_ALSA
#define VOLUME_MIXER_TYPE_DEFAULT               VOLUME_MIXER_TYPE_ALSA
#define VOLUME_MIXER_DEVICE_DEFAULT             VOLUME_MIXER_ALSA_DEFAULT
#else
#define VOLUME_MIXER_TYPE_DEFAULT               VOLUME_MIXER_TYPE_SOFTWARE
#define VOLUME_MIXER_DEVICE_DEFAULT             VOLUME_MIXER_SOFTWARE_DEFAULT
#endif
#endif

static int volume_mixerType = VOLUME_MIXER_TYPE_DEFAULT;
static const char *volume_mixerDevice = VOLUME_MIXER_DEVICE_DEFAULT;

static int volume_softwareSet = 100;

#ifdef HAVE_OSS
static int volume_ossFd = -1;
static int volume_ossControl = SOUND_MIXER_PCM;
#endif

#ifdef HAVE_ALSA
static snd_mixer_t *volume_alsaMixerHandle;
static snd_mixer_elem_t *volume_alsaElem;
static long volume_alsaMin;
static long volume_alsaMax;
static int volume_alsaSet = -1;
#endif

#ifdef HAVE_OSS

#include <alloca.h> /* only alloca user in mpd atm, may change ... */

static void closeOssMixer(void)
{
	while (close(volume_ossFd) && errno == EINTR) ;
	volume_ossFd = -1;
}

static int prepOssMixer(const char *device)
{
	ConfigParam *param;

	if ((volume_ossFd = open(device, O_RDONLY)) < 0) {
		WARNING("unable to open oss mixer \"%s\"\n", device);
		return -1;
	}

	if ((param = getConfigParam(CONF_MIXER_CONTROL))) {
		const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
		int i;
		int devmask = 0;

		if (ioctl(volume_ossFd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
			WARNING("errors getting read_devmask for oss mixer\n");
			closeOssMixer();
			return -1;
		}

		for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
			ssize_t len = strlen(labels[i]);
			char *duplicated = alloca(len + 1);

			/* eliminate spaces at the end */
			memcpy(duplicated, labels[i], len + 1);
			len -= 2;
			while (len >= 0 && duplicated[len] == ' ')
				duplicated[len--] = '\0';
			if (strcasecmp(duplicated, param->value) == 0)
				break;
		}

		if (i >= SOUND_MIXER_NRDEVICES) {
			WARNING("mixer control \"%s\" not found at line %i\n",
				param->value, param->line);
			closeOssMixer();
			return -1;
		} else if (!((1 << i) & devmask)) {
			WARNING("mixer control \"%s\" not usable at line %i\n",
				param->value, param->line);
			closeOssMixer();
			return -1;
		}

		volume_ossControl = i;
	}

	return 0;
}

static int ensure_oss_open(void)
{
	if ((volume_ossFd < 0 && prepOssMixer(volume_mixerDevice) < 0))
		return -1;
	return 0;
}

static int getOssVolumeLevel(void)
{
	int left, right, level;

	if (ensure_oss_open() < 0)
		return -1;

	if (ioctl(volume_ossFd, MIXER_READ(volume_ossControl), &level) < 0) {
		closeOssMixer();
		WARNING("unable to read volume\n");
		return -1;
	}

	left = level & 0xff;
	right = (level & 0xff00) >> 8;

	if (left != right) {
		WARNING("volume for left and right is not the same, \"%i\" and "
			"\"%i\"\n", left, right);
	}

	return left;
}

static int changeOssVolumeLevel(int change, int rel)
{
	int current;
	int new;
	int level;

	if (rel) {
		if ((current = getOssVolumeLevel()) < 0)
			return -1;

		new = current + change;
	} else {
		if (ensure_oss_open() < 0)
			return -1;
		new = change;
	}

	if (new < 0)
		new = 0;
	else if (new > 100)
		new = 100;

	level = (new << 8) + new;

	if (ioctl(volume_ossFd, MIXER_WRITE(volume_ossControl), &level) < 0) {
		closeOssMixer();
		return -1;
	}

	return 0;
}
#endif

#ifdef HAVE_ALSA
static void closeAlsaMixer(void)
{
	snd_mixer_close(volume_alsaMixerHandle);
	volume_alsaMixerHandle = NULL;
}

static int prepAlsaMixer(const char *card)
{
	int err;
	snd_mixer_elem_t *elem;
	const char *controlName = VOLUME_MIXER_ALSA_CONTROL_DEFAULT;
	ConfigParam *param;

	err = snd_mixer_open(&volume_alsaMixerHandle, 0);
	snd_config_update_free_global();
	if (err < 0) {
		WARNING("problems opening alsa mixer: %s\n", snd_strerror(err));
		return -1;
	}

	if ((err = snd_mixer_attach(volume_alsaMixerHandle, card)) < 0) {
		closeAlsaMixer();
		WARNING("problems attaching alsa mixer: %s\n",
			snd_strerror(err));
		return -1;
	}

	if ((err =
	     snd_mixer_selem_register(volume_alsaMixerHandle, NULL,
				      NULL)) < 0) {
		closeAlsaMixer();
		WARNING("problems snd_mixer_selem_register'ing: %s\n",
			snd_strerror(err));
		return -1;
	}

	if ((err = snd_mixer_load(volume_alsaMixerHandle)) < 0) {
		closeAlsaMixer();
		WARNING("problems snd_mixer_selem_register'ing: %s\n",
			snd_strerror(err));
		return -1;
	}

	elem = snd_mixer_first_elem(volume_alsaMixerHandle);

	param = getConfigParam(CONF_MIXER_CONTROL);

	if (param) {
		controlName = param->value;
	}

	while (elem) {
		if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
			if (strcasecmp(controlName,
				       snd_mixer_selem_get_name(elem)) == 0) {
				break;
			}
		}
		elem = snd_mixer_elem_next(elem);
	}

	if (elem) {
		volume_alsaElem = elem;
		snd_mixer_selem_get_playback_volume_range(volume_alsaElem,
							  &volume_alsaMin,
							  &volume_alsaMax);
		return 0;
	}

	WARNING("can't find alsa mixer_control \"%s\"\n", controlName);

	closeAlsaMixer();
	return -1;
}

static int prep_alsa_get_level(long *level)
{
	const char *cmd;
	int err;

	if (!volume_alsaMixerHandle && prepAlsaMixer(volume_mixerDevice) < 0)
		return -1;

	if ((err = snd_mixer_handle_events(volume_alsaMixerHandle)) < 0) {
		cmd = "handle_events";
		goto error;
	}
	if ((err = snd_mixer_selem_get_playback_volume(volume_alsaElem,
						       SND_MIXER_SCHN_FRONT_LEFT,
						       level)) < 0) {
		cmd = "selem_get_playback_volume";
		goto error;
	}
	return 0;

error:
	WARNING("problems getting alsa volume: %s (snd_mixer_%s)\n",
		snd_strerror(err), cmd);
	closeAlsaMixer();
	return -1;
}

static int getAlsaVolumeLevel(void)
{
	int ret;
	long level;
	long max = volume_alsaMax;
	long min = volume_alsaMin;

	if (prep_alsa_get_level(&level) < 0)
		return -1;

	ret = ((volume_alsaSet / 100.0) * (max - min) + min) + 0.5;
	if (volume_alsaSet > 0 && ret == level) {
		ret = volume_alsaSet;
	} else
		ret = (int)(100 * (((float)(level - min)) / (max - min)) + 0.5);

	return ret;
}

static int changeAlsaVolumeLevel(int change, int rel)
{
	float vol;
	long level;
	long test;
	long max = volume_alsaMax;
	long min = volume_alsaMin;
	int err;

	if (prep_alsa_get_level(&level) < 0)
		return -1;

	if (rel) {
		test = ((volume_alsaSet / 100.0) * (max - min) + min) + 0.5;
		if (volume_alsaSet >= 0 && level == test) {
			vol = volume_alsaSet;
		} else
			vol = 100.0 * (((float)(level - min)) / (max - min));
		vol += change;
	} else
		vol = change;

	volume_alsaSet = vol + 0.5;
	volume_alsaSet = volume_alsaSet > 100 ? 100 :
	    (volume_alsaSet < 0 ? 0 : volume_alsaSet);

	level = (long)(((vol / 100.0) * (max - min) + min) + 0.5);
	level = level > max ? max : level;
	level = level < min ? min : level;

	if ((err =
	     snd_mixer_selem_set_playback_volume_all(volume_alsaElem,
						     level)) < 0) {
		WARNING("problems setting alsa volume: %s\n",
			snd_strerror(err));
		closeAlsaMixer();
		return -1;
	}

	return 0;
}
#endif

static int prepMixer(const char *device)
{
	switch (volume_mixerType) {
#ifdef HAVE_ALSA
	case VOLUME_MIXER_TYPE_ALSA:
		return prepAlsaMixer(device);
#endif
#ifdef HAVE_OSS
	case VOLUME_MIXER_TYPE_OSS:
		return prepOssMixer(device);
#endif
	}

	return 0;
}

void finishVolume(void)
{
	switch (volume_mixerType) {
#ifdef HAVE_ALSA
	case VOLUME_MIXER_TYPE_ALSA:
		closeAlsaMixer();
		break;
#endif
#ifdef HAVE_OSS
	case VOLUME_MIXER_TYPE_OSS:
		closeOssMixer();
		break;
#endif
	}
}

void initVolume(void)
{
	ConfigParam *param = getConfigParam(CONF_MIXER_TYPE);

	if (param) {
		if (0) ;
#ifdef HAVE_ALSA
		else if (strcmp(param->value, VOLUME_MIXER_ALSA) == 0) {
			volume_mixerType = VOLUME_MIXER_TYPE_ALSA;
			volume_mixerDevice = VOLUME_MIXER_ALSA_DEFAULT;
		}
#endif
#ifdef HAVE_OSS
		else if (strcmp(param->value, VOLUME_MIXER_OSS) == 0) {
			volume_mixerType = VOLUME_MIXER_TYPE_OSS;
			volume_mixerDevice = VOLUME_MIXER_OSS_DEFAULT;
		}
#endif
		else if (strcmp(param->value, VOLUME_MIXER_SOFTWARE) == 0) {
			volume_mixerType = VOLUME_MIXER_TYPE_SOFTWARE;
			volume_mixerDevice = VOLUME_MIXER_SOFTWARE_DEFAULT;
		} else {
			FATAL("unknown mixer type %s at line %i\n",
			      param->value, param->line);
		}
	}

	param = getConfigParam(CONF_MIXER_DEVICE);

	if (param) {
		volume_mixerDevice = param->value;
	}
}

void openVolumeDevice(void)
{
	if (prepMixer(volume_mixerDevice) < 0) {
		WARNING("using software volume\n");
		volume_mixerType = VOLUME_MIXER_TYPE_SOFTWARE;
	}
}

static int getSoftwareVolume(void)
{
	return volume_softwareSet;
}

int getVolumeLevel(void)
{
	switch (volume_mixerType) {
#ifdef HAVE_ALSA
	case VOLUME_MIXER_TYPE_ALSA:
		return getAlsaVolumeLevel();
#endif
#ifdef HAVE_OSS
	case VOLUME_MIXER_TYPE_OSS:
		return getOssVolumeLevel();
#endif
	case VOLUME_MIXER_TYPE_SOFTWARE:
		return getSoftwareVolume();
	default:
		return -1;
	}
}

static int changeSoftwareVolume(int change, int rel)
{
	int new = change;

	if (rel)
		new += volume_softwareSet;

	if (new > 100)
		new = 100;
	else if (new < 0)
		new = 0;

	volume_softwareSet = new;

	/*new = 100.0*(exp(new/50.0)-1)/(M_E*M_E-1)+0.5; */
	if (new >= 100)
		new = 1000;
	else if (new <= 0)
		new = 0;
	else
		new = pcm_float_to_volume((exp(new / 25.0) - 1) /
					  (54.5981500331F - 1));

	setPlayerSoftwareVolume(new);

	return 0;
}

int changeVolumeLevel(int change, int rel)
{
	idle_add(IDLE_MIXER);

	switch (volume_mixerType) {
#ifdef HAVE_ALSA
	case VOLUME_MIXER_TYPE_ALSA:
		return changeAlsaVolumeLevel(change, rel);
#endif
#ifdef HAVE_OSS
	case VOLUME_MIXER_TYPE_OSS:
		return changeOssVolumeLevel(change, rel);
#endif
	case VOLUME_MIXER_TYPE_SOFTWARE:
		return changeSoftwareVolume(change, rel);
	default:
		return 0;
	}
}

void read_sw_volume_state(FILE *fp)
{
	char buf[sizeof(SW_VOLUME_STATE) + sizeof("100") - 1];
	char *end = NULL;
	long int sv;

	if (volume_mixerType != VOLUME_MIXER_TYPE_SOFTWARE)
		return;
	while (myFgets(buf, sizeof(buf), fp)) {
		if (!g_str_has_prefix(buf, SW_VOLUME_STATE))
			continue;
		sv = strtol(buf + strlen(SW_VOLUME_STATE), &end, 10);
		if (mpd_likely(!*end))
			changeSoftwareVolume(sv, 0);
		else
			ERROR("Can't parse software volume: %s\n", buf);
		return;
	}
}

void save_sw_volume_state(FILE *fp)
{
	if (volume_mixerType == VOLUME_MIXER_TYPE_SOFTWARE)
		fprintf(fp, SW_VOLUME_STATE "%d\n", volume_softwareSet);
}