summaryrefslogtreecommitdiff
path: root/components/volume.c
blob: 5c850118224bb40380cdbdc224d27574e321503a (plain)
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
/* See LICENSE file for copyright and license details. */
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>

#include "../util.h"
#include "../slstatus.h"

#if defined(__OpenBSD__) | defined(__FreeBSD__)
	#include <sys/queue.h>
	#include <poll.h>
	#include <sndio.h>
	#include <stdlib.h>

	struct control {
		LIST_ENTRY(control)	next;
		unsigned int		addr;
	#define CTRL_NONE	0
	#define CTRL_LEVEL	1
	#define CTRL_MUTE	2
		unsigned int		type;
		unsigned int		maxval;
		unsigned int		val;
	};

	static LIST_HEAD(, control) controls = LIST_HEAD_INITIALIZER(controls);
	static struct pollfd *pfds;
	static struct sioctl_hdl *hdl;
	static int initialized;

	/*
	 * Call-back to obtain the description of all audio controls.
	 */
	static void
	ondesc(void *unused, struct sioctl_desc *desc, int val)
	{
		struct control *c, *ctmp;
		unsigned int type = CTRL_NONE;

		if (desc == NULL)
			return;

		/* Delete existing audio control with the same address. */
		LIST_FOREACH_SAFE(c, &controls, next, ctmp) {
			if (desc->addr == c->addr) {
				LIST_REMOVE(c, next);
				free(c);
				break;
			}
		}

		/* Only match output.level and output.mute audio controls. */
		if (desc->group[0] != 0 ||
		    strcmp(desc->node0.name, "output") != 0)
			return;
		if (desc->type == SIOCTL_NUM &&
		    strcmp(desc->func, "level") == 0)
			type = CTRL_LEVEL;
		else if (desc->type == SIOCTL_SW &&
			 strcmp(desc->func, "mute") == 0)
			type = CTRL_MUTE;
		else
			return;

		c = malloc(sizeof(struct control));
		if (c == NULL) {
			warn("sndio: failed to allocate audio control\n");
			return;
		}

		c->addr = desc->addr;
		c->type = type;
		c->maxval = desc->maxval;
		c->val = val;
		LIST_INSERT_HEAD(&controls, c, next);
	}

	/*
	 * Call-back invoked whenever an audio control changes.
	 */
	static void
	onval(void *unused, unsigned int addr, unsigned int val)
	{
		struct control *c;

		LIST_FOREACH(c, &controls, next) {
			if (c->addr == addr)
				break;
		}
		c->val = val;
	}

	static void
	cleanup(void)
	{
		struct control *c;

		if (hdl) {
			sioctl_close(hdl);
			hdl = NULL;
		}

		free(pfds);
		pfds = NULL;

		while (!LIST_EMPTY(&controls)) {
			c = LIST_FIRST(&controls);
			LIST_REMOVE(c, next);
			free(c);
		}
	}

	static int
	init(void)
	{
		hdl = sioctl_open(SIO_DEVANY, SIOCTL_READ, 0);
		if (hdl == NULL) {
			warn("sndio: cannot open device");
			goto failed;
		}

		if (!sioctl_ondesc(hdl, ondesc, NULL)) {
			warn("sndio: cannot set control description call-back");
			goto failed;
		}

		if (!sioctl_onval(hdl, onval, NULL)) {
			warn("sndio: cannot set control values call-back");
			goto failed;
		}

		pfds = calloc(sioctl_nfds(hdl), sizeof(struct pollfd));
		if (pfds == NULL) {
			warn("sndio: cannot allocate pollfd structures");
			goto failed;
		}

		return 1;
	failed:
		cleanup();
		return 0;
	}

	const char *
	vol_perc(const char *unused)
	{
		struct control *c;
		int n, v, value;

		if (!initialized)
			initialized = init();

		if (hdl == NULL)
			return NULL;

		n = sioctl_pollfd(hdl, pfds, POLLIN);
		if (n > 0) {
			n = poll(pfds, n, 0);
			if (n > 0) {
				if (sioctl_revents(hdl, pfds) & POLLHUP) {
					warn("sndio: disconnected");
					cleanup();
					initialized = 0;
					return NULL;
				}
			}
		}

		value = 100;
		LIST_FOREACH(c, &controls, next) {
			if (c->type == CTRL_MUTE && c->val == 1)
				value = 0;
			else if (c->type == CTRL_LEVEL) {
				v = (c->val * 100 + c->maxval / 2) / c->maxval;
				/* For multiple channels return the minimum. */
				if (v < value)
					value = v;
			}
		}

		return bprintf("%d", value);
	}
#else
	#include <sys/soundcard.h>

	const char *
	vol_perc(const char *card)
	{
		size_t i;
		int v, afd, devmask;
		char *vnames[] = SOUND_DEVICE_NAMES;

		if ((afd = open(card, O_RDONLY | O_NONBLOCK)) < 0) {
			warn("open '%s':", card);
			return NULL;
		}

		if (ioctl(afd, (int)SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
			warn("ioctl 'SOUND_MIXER_READ_DEVMASK':");
			close(afd);
			return NULL;
		}
		for (i = 0; i < LEN(vnames); i++) {
			if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
				if (ioctl(afd, MIXER_READ(i), &v) < 0) {
					warn("ioctl 'MIXER_READ(%ld)':", i);
					close(afd);
					return NULL;
				}
			}
		}

		close(afd);

		return bprintf("%d", v & 0xff);
	}
#endif