Commit | Line | Data |
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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) { | |
f845e711 RK |
103 | static int reported; |
104 | ||
105 | if(!reported) { | |
106 | error(0, "don't know how to set volume on this platform"); | |
107 | reported = 1; | |
108 | } | |
460b9539 | 109 | return -1; |
110 | } | |
111 | #endif | |
112 | ||
113 | /* | |
114 | Local Variables: | |
115 | c-basic-offset:2 | |
116 | comment-column:40 | |
117 | End: | |
118 | */ |