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
|
#include "../output_api.h"
#include "../mixer_api.h"
#include <glib.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#if defined(__OpenBSD__) || defined(__NetBSD__)
# include <soundcard.h>
#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
# include <sys/soundcard.h>
#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
struct oss_mixer {
const char *device;
const char *control;
int device_fd;
int volume_control;
};
struct oss_mixer *oss_mixer_init(void);
void oss_mixer_finish(struct oss_mixer *am);
void oss_mixer_configure(struct oss_mixer *am, ConfigParam *param);
bool oss_mixer_open(struct oss_mixer *am);
bool oss_mixer_control(struct oss_mixer *am, int cmd, void *arg);
void oss_mixer_close(struct oss_mixer *am);
struct oss_mixer *
oss_mixer_init(void)
{
struct oss_mixer *om = g_malloc(sizeof(struct oss_mixer));
om->device = NULL;
om->control = NULL;
om->device_fd = -1;
om->volume_control = SOUND_MIXER_PCM;
return om;
}
void
oss_mixer_finish(struct oss_mixer *om)
{
g_free(om);
}
void
oss_mixer_configure(struct oss_mixer *om, ConfigParam *param)
{
BlockParam *bp;
bp = getBlockParam(param, "mixer_device");
if (bp) {
om->device = bp->value;
}
bp = getBlockParam(param, "mixer_control");
if (bp) {
om->control = bp->value;
}
}
void
oss_mixer_close(struct oss_mixer *om)
{
if (om->device_fd != -1)
while (close(om->device_fd) && errno == EINTR) ;
om->device_fd = -1;
}
static int
oss_find_mixer(const char *name)
{
const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
size_t name_length = strlen(name);
for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (strncasecmp(name, labels[i], name_length) == 0 &&
(labels[i][name_length] == 0 ||
labels[i][name_length] == ' '))
return i;
}
return -1;
}
bool
oss_mixer_open(struct oss_mixer *om)
{
const char *device = VOLUME_MIXER_OSS_DEFAULT;
if (om->device) {
device = om->device;
}
if ((om->device_fd = open(device, O_RDONLY)) < 0) {
g_warning("Unable to open oss mixer \"%s\"\n", device);
return false;
}
if (om->control) {
int i;
int devmask = 0;
if (ioctl(om->device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
g_warning("errors getting read_devmask for oss mixer\n");
oss_mixer_close(om);
return false;
}
i = oss_find_mixer(om->control);
if (i < 0) {
g_warning("mixer control \"%s\" not found\n",
om->control);
oss_mixer_close(om);
return false;
} else if (!((1 << i) & devmask)) {
g_warning("mixer control \"%s\" not usable\n",
om->control);
oss_mixer_close(om);
return false;
}
om->volume_control = i;
}
return true;
}
bool
oss_mixer_control(struct oss_mixer *om, int cmd, void *arg)
{
switch (cmd) {
case AC_MIXER_CONFIGURE:
oss_mixer_configure(om, (ConfigParam *)arg);
//if (om->device_fd >= 0)
oss_mixer_close(om);
return true;
break;
case AC_MIXER_GETVOL:
{
int left, right, level;
int *ret;
if (om->device_fd < 0 && !oss_mixer_open(om)) {
return false;
}
if (ioctl(om->device_fd, MIXER_READ(om->volume_control), &level) < 0) {
oss_mixer_close(om);
g_warning("unable to read oss volume\n");
return false;
}
left = level & 0xff;
right = (level & 0xff00) >> 8;
if (left != right) {
g_warning("volume for left and right is not the same, \"%i\" and "
"\"%i\"\n", left, right);
}
ret = (int *) arg;
*ret = left;
return true;
}
case AC_MIXER_SETVOL:
{
int new;
int level;
int *value = arg;
if (om->device_fd < 0 && !oss_mixer_open(om)) {
return false;
}
new = *value;
if (new < 0) {
new = 0;
} else if (new > 100) {
new = 100;
}
level = (new << 8) + new;
if (ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level) < 0) {
g_warning("unable to set oss volume\n");
oss_mixer_close(om);
return false;
}
return true;
}
default:
g_warning("Unsuported oss control\n");
break;
}
return false;
}
|
