Commit | Line | Data |
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bd8895a8 | 1 | /* |
2 | * This file is part of DisOrder | |
a35bb7cc | 3 | * Copyright (C) 2004, 2007, 2008 Richard Kettlewell |
bd8895a8 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
bd8895a8 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
bd8895a8 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
bd8895a8 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
bd8895a8 | 17 | */ |
b25aac59 | 18 | /** @file lib/mixer-oss.c |
19 | * @brief OSS mixer support | |
20 | * | |
21 | * Mono output devices aren't explicitly supported (but may work | |
22 | * nonetheless). | |
23 | */ | |
bd8895a8 | 24 | |
05b75f8d | 25 | #include "common.h" |
b25aac59 | 26 | |
27 | #if HAVE_SYS_SOUNDCARD_H | |
28 | ||
bd8895a8 | 29 | #include <fcntl.h> |
30 | #include <unistd.h> | |
bd8895a8 | 31 | #include <errno.h> |
32 | #include <stddef.h> | |
33 | #include <sys/ioctl.h> | |
b25aac59 | 34 | #include <sys/soundcard.h> |
bd8895a8 | 35 | |
36 | #include "configuration.h" | |
37 | #include "mixer.h" | |
38 | #include "log.h" | |
39 | #include "syscalls.h" | |
a35bb7cc | 40 | #include "mem.h" |
bd8895a8 | 41 | |
bd8895a8 | 42 | /* documentation does not match implementation! */ |
43 | #ifndef SOUND_MIXER_READ | |
44 | # define SOUND_MIXER_READ(x) MIXER_READ(x) | |
45 | #endif | |
46 | #ifndef SOUND_MIXER_WRITE | |
47 | # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x) | |
48 | #endif | |
49 | ||
b25aac59 | 50 | /** @brief Channel names */ |
bd8895a8 | 51 | static const char *channels[] = SOUND_DEVICE_NAMES; |
52 | ||
b25aac59 | 53 | /** @brief Convert channel name to number */ |
bd8895a8 | 54 | static int mixer_channel(const char *c) { |
55 | unsigned n; | |
56 | ||
57 | if(!c[strspn(c, "0123456789")]) | |
58 | return atoi(c); | |
59 | else { | |
60 | for(n = 0; n < sizeof channels / sizeof *channels; ++n) | |
61 | if(!strcmp(channels[n], c)) | |
62 | return n; | |
63 | return -1; | |
64 | } | |
65 | } | |
66 | ||
b25aac59 | 67 | /** @brief Open the OSS mixer device and return its fd */ |
bd8895a8 | 68 | static int oss_do_open(void) { |
69 | int fd; | |
70 | ||
a35bb7cc RK |
71 | if((fd = open(config->mixer, O_RDWR, 0)) < 0) { |
72 | static char *reported; | |
73 | ||
74 | if(!reported || strcmp(reported, config->mixer)) { | |
75 | if(reported) | |
76 | xfree(reported); | |
77 | reported = xstrdup(config->mixer); | |
78 | error(errno, "error opening %s", config->mixer); | |
79 | } | |
80 | } | |
bd8895a8 | 81 | return fd; |
82 | } | |
83 | ||
b25aac59 | 84 | /** @brief Get the OSS mixer setting */ |
bd8895a8 | 85 | static int oss_do_get(int *left, int *right, int fd, int ch) { |
86 | int r; | |
87 | ||
88 | if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) { | |
89 | error(errno, "error reading %s channel %s", | |
90 | config->mixer, config->channel); | |
91 | return -1; | |
92 | } | |
93 | *left = r & 0xff; | |
94 | *right = (r >> 8) & 0xff; | |
95 | return 0; | |
96 | } | |
97 | ||
b25aac59 | 98 | /** @brief Get OSS volume */ |
bd8895a8 | 99 | static int oss_get(int *left, int *right) { |
100 | int ch, fd; | |
101 | ||
102 | if(config->mixer | |
103 | && config->channel | |
104 | && (ch = mixer_channel(config->channel)) != -1) { | |
105 | if((fd = oss_do_open()) < 0) | |
106 | return -1; | |
107 | if(oss_do_get(left, right, fd, ch) < 0) { | |
108 | xclose(fd); | |
109 | return -1; | |
110 | } | |
111 | xclose(fd); | |
112 | return 0; | |
113 | } else | |
114 | return -1; | |
115 | } | |
116 | ||
b25aac59 | 117 | /** @brief Set OSS volume */ |
bd8895a8 | 118 | static int oss_set(int *left, int *right) { |
119 | int ch, fd, r; | |
120 | ||
121 | if(config->mixer | |
122 | && config->channel | |
123 | && (ch = mixer_channel(config->channel)) != -1) { | |
124 | if((fd = oss_do_open()) < 0) | |
125 | return -1; | |
126 | r = (*left & 0xff) + (*right & 0xff) * 256; | |
127 | if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) { | |
128 | error(errno, "error changing %s channel %s", | |
129 | config->mixer, config->channel); | |
130 | xclose(fd); | |
131 | return -1; | |
132 | } | |
133 | if(oss_do_get(left, right, fd, ch) < 0) { | |
134 | xclose(fd); | |
135 | return -1; | |
136 | } | |
137 | xclose(fd); | |
138 | return 0; | |
139 | } else | |
140 | return -1; | |
141 | } | |
142 | ||
b25aac59 | 143 | /** @brief OSS mixer vtable */ |
bd8895a8 | 144 | const struct mixer mixer_oss = { |
145 | BACKEND_OSS, | |
bd8895a8 | 146 | oss_get, |
147 | oss_set, | |
148 | "/dev/mixer", | |
149 | "pcm" | |
150 | }; | |
151 | #endif | |
152 | ||
153 | /* | |
154 | Local Variables: | |
155 | c-basic-offset:2 | |
156 | comment-column:40 | |
157 | End: | |
158 | */ |