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
|
/*
* Copyright 2004-2005 Timo Hirvonen
*
* 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 "mixer.h"
#include "op.h"
#include "xmalloc.h"
#include "debug.h"
#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API
#include <alsa/asoundlib.h>
static snd_mixer_t *alsa_mixer_handle;
static snd_mixer_elem_t *mixer_elem = NULL;
static long mixer_vol_min, mixer_vol_max;
/* configuration */
static char *alsa_mixer_device = NULL;
static char *alsa_mixer_element = NULL;
static int alsa_mixer_init(void)
{
if (alsa_mixer_device == NULL)
alsa_mixer_device = xstrdup("default");
if (alsa_mixer_element == NULL)
alsa_mixer_element = xstrdup("PCM");
/* FIXME: check device */
return 0;
}
static int alsa_mixer_exit(void)
{
free(alsa_mixer_device);
alsa_mixer_device = NULL;
free(alsa_mixer_element);
alsa_mixer_element = NULL;
return 0;
}
static int alsa_mixer_open(int *volume_max)
{
snd_mixer_selem_id_t *sid;
snd_mixer_elem_t *elem;
int count;
int rc;
snd_mixer_selem_id_alloca(&sid);
rc = snd_mixer_open(&alsa_mixer_handle, 0);
if (rc < 0)
goto error;
rc = snd_mixer_attach(alsa_mixer_handle, alsa_mixer_device);
if (rc < 0)
goto error;
rc = snd_mixer_selem_register(alsa_mixer_handle, NULL, NULL);
if (rc < 0)
goto error;
rc = snd_mixer_load(alsa_mixer_handle);
if (rc < 0)
goto error;
count = snd_mixer_get_count(alsa_mixer_handle);
if (count == 0) {
d_print("error: mixer does not have elements\n");
return -2;
}
elem = snd_mixer_first_elem(alsa_mixer_handle);
while (elem) {
const char *name;
int has_vol, has_switch;
snd_mixer_selem_get_id(elem, sid);
name = snd_mixer_selem_id_get_name(sid);
d_print("name = %s\n", name);
d_print("has playback volume = %d\n", snd_mixer_selem_has_playback_volume(elem));
d_print("has playback switch = %d\n", snd_mixer_selem_has_playback_switch(elem));
if (strcasecmp(name, alsa_mixer_element)) {
elem = snd_mixer_elem_next(elem);
continue;
}
has_vol = snd_mixer_selem_has_playback_volume(elem);
if (!has_vol) {
d_print("mixer element `%s' does not have playback volume\n", name);
return -2;
}
snd_mixer_selem_get_playback_volume_range(elem,
&mixer_vol_min, &mixer_vol_max);
has_switch = snd_mixer_selem_has_playback_switch(elem);
/* FIXME: get number of channels */
mixer_elem = elem;
*volume_max = mixer_vol_max - mixer_vol_min;
return 0;
}
d_print("error: mixer element `%s' not found\n", alsa_mixer_element);
return -2;
error:
d_print("error: %s\n", snd_strerror(rc));
return -1;
}
static int alsa_mixer_close(void)
{
snd_mixer_close(alsa_mixer_handle);
return 0;
}
static int alsa_mixer_set_volume(int l, int r)
{
if (mixer_elem == NULL) {
return -1;
}
l += mixer_vol_min;
r += mixer_vol_min;
if (l > mixer_vol_max)
d_print("error: left volume too high (%d > %ld)\n",
l, mixer_vol_max);
if (r > mixer_vol_max)
d_print("error: right volume too high (%d > %ld)\n",
r, mixer_vol_max);
snd_mixer_selem_set_playback_volume(mixer_elem, SND_MIXER_SCHN_FRONT_LEFT, l);
snd_mixer_selem_set_playback_volume(mixer_elem, SND_MIXER_SCHN_FRONT_RIGHT, r);
return 0;
}
static int alsa_mixer_get_volume(int *l, int *r)
{
long lv, rv;
if (mixer_elem == NULL)
return -1;
snd_mixer_handle_events(alsa_mixer_handle);
snd_mixer_selem_get_playback_volume(mixer_elem, SND_MIXER_SCHN_FRONT_LEFT, &lv);
snd_mixer_selem_get_playback_volume(mixer_elem, SND_MIXER_SCHN_FRONT_RIGHT, &rv);
*l = lv - mixer_vol_min;
*r = rv - mixer_vol_min;
return 0;
}
static int alsa_mixer_set_option(int key, const char *val)
{
switch (key) {
case 0:
free(alsa_mixer_element);
alsa_mixer_element = xstrdup(val);
break;
case 1:
free(alsa_mixer_device);
alsa_mixer_device = xstrdup(val);
break;
default:
return -OP_ERROR_NOT_OPTION;
}
return 0;
}
static int alsa_mixer_get_option(int key, char **val)
{
switch (key) {
case 0:
if (alsa_mixer_element)
*val = xstrdup(alsa_mixer_element);
break;
case 1:
if (alsa_mixer_device)
*val = xstrdup(alsa_mixer_device);
break;
default:
return -OP_ERROR_NOT_OPTION;
}
return 0;
}
const struct mixer_plugin_ops op_mixer_ops = {
.init = alsa_mixer_init,
.exit = alsa_mixer_exit,
.open = alsa_mixer_open,
.close = alsa_mixer_close,
.set_volume = alsa_mixer_set_volume,
.get_volume = alsa_mixer_get_volume,
.set_option = alsa_mixer_set_option,
.get_option = alsa_mixer_get_option
};
const char * const op_mixer_options[] = {
"channel",
"device",
NULL
};
|
