460b9539 |
1 | /* |
2 | * This file is part of DisOrder |
3 | * Copyright (C) 2004 Richard Kettlewell |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
18 | * USA |
19 | */ |
20 | |
21 | #include <config.h> |
22 | |
23 | #include <stdio.h> |
24 | #include <string.h> |
25 | #include <fcntl.h> |
26 | #include <unistd.h> |
27 | #include <stdlib.h> |
28 | #include <errno.h> |
29 | #include <stddef.h> |
30 | #include <sys/ioctl.h> |
31 | |
32 | #include "configuration.h" |
33 | #include "mixer.h" |
34 | #include "log.h" |
35 | #include "syscalls.h" |
36 | |
37 | #if HAVE_SYS_SOUNDCARD_H |
38 | #include <sys/soundcard.h> |
39 | |
40 | /* documentation does not match implementation! */ |
41 | #ifndef SOUND_MIXER_READ |
42 | # define SOUND_MIXER_READ(x) MIXER_READ(x) |
43 | #endif |
44 | #ifndef SOUND_MIXER_WRITE |
45 | # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x) |
46 | #endif |
47 | |
48 | static const char *channels[] = SOUND_DEVICE_NAMES; |
49 | |
50 | int mixer_channel(const char *c) { |
51 | unsigned n; |
52 | |
53 | if(!c[strspn(c, "0123456789")]) |
54 | return atoi(c); |
55 | else { |
56 | for(n = 0; n < sizeof channels / sizeof *channels; ++n) |
57 | if(!strcmp(channels[n], c)) |
58 | return n; |
59 | return -1; |
60 | } |
61 | } |
62 | |
63 | int mixer_control(int *left, int *right, int set) { |
64 | int fd, ch, r; |
65 | |
66 | if(config->mixer |
67 | && config->channel |
68 | && (ch = mixer_channel(config->channel)) != -1) { |
69 | if((fd = open(config->mixer, O_RDWR, 0)) < 0) { |
70 | error(errno, "error opening %s", config->mixer); |
71 | return -1; |
72 | } |
73 | if(set) { |
74 | r = (*left & 0xff) + (*right & 0xff) * 256; |
75 | if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) { |
76 | error(errno, "error changing %s channel %s", |
77 | config->mixer, config->channel); |
78 | xclose(fd); |
79 | return -1; |
80 | } |
81 | } |
82 | if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) { |
83 | error(errno, "error reading %s channel %s", |
84 | config->mixer, config->channel); |
85 | xclose(fd); |
86 | return -1; |
87 | } |
88 | *left = r & 0xff; |
89 | *right = (r >> 8) & 0xff; |
90 | xclose(fd); |
91 | return 0; |
92 | } else |
93 | return -1; |
94 | } |
95 | #else |
96 | int mixer_channel(const char attribute((unused)) *c) { |
97 | return 0; |
98 | } |
99 | |
100 | int mixer_control(int attribute((unused)) *left, |
101 | int attribute((unused)) *right, |
102 | int attribute((unused)) set) { |
103 | error(0, "don't know how to set volume on this platform"); |
104 | return -1; |
105 | } |
106 | #endif |
107 | |
108 | /* |
109 | Local Variables: |
110 | c-basic-offset:2 |
111 | comment-column:40 |
112 | End: |
113 | */ |