1 /*
2 ** Copyright 2010, The Android Open-Source Project
3 ** Copyright (c) 2011, Code Aurora Forum. All rights reserved.
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <errno.h>
22 #include <ctype.h>
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <fcntl.h>
27 #include <unistd.h>
28 #include <stdint.h>
29 #include <string.h>
30
31 #include "alsa_audio.h"
32
33
get_ctl(struct mixer * mixer,char * name)34 struct mixer_ctl *get_ctl(struct mixer *mixer, char *name)
35 {
36 char *p;
37 unsigned idx = 0;
38
39 if (isdigit(name[0]))
40 return mixer_get_nth_control(mixer, atoi(name) - 1);
41
42 p = strrchr(name, '#');
43 if (p) {
44 *p++ = 0;
45 idx = atoi(p);
46 }
47
48 return mixer_get_control(mixer, name, idx);
49 }
50
main(int argc,char ** argv)51 int main(int argc, char **argv)
52 {
53 struct mixer *mixer;
54 struct mixer_ctl *ctl;
55 unsigned value;
56 int r;
57 const char* device = "/dev/snd/controlC0";
58
59 mixer = mixer_open(device);
60 if (!mixer){
61 fprintf(stderr,"oops: %s: %d\n", strerror(errno), __LINE__);
62 return -1;
63 }
64
65 if (argc == 1) {
66 mixer_dump(mixer);
67 mixer_close(mixer);
68 return 0;
69 }
70
71 ctl = get_ctl(mixer, argv[1]);
72 argc -= 2;
73 argv += 2;
74
75 if (!ctl) {
76 fprintf(stderr,"can't find control\n");
77 mixer_close(mixer);
78 return -1;
79 }
80 if (argc) {
81 if (isdigit(argv[0][0]))
82 r = mixer_ctl_set_value(ctl, argc, argv);
83 else
84 r = mixer_ctl_select(ctl, argv[0]);
85 if (r)
86 fprintf(stderr,"oops: %s: %d\n", strerror(errno), __LINE__);
87 } else {
88 mixer_ctl_get(ctl, &value);
89 }
90 mixer_close(mixer);
91 return 0;
92 }
93