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
34struct 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
51int 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