bd8895a8 |
1 | /* |
2 | * This file is part of DisOrder |
3 | * Copyright (C) 2004, 2007 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 | */ |
b25aac59 |
20 | /** @file lib/mixer-oss.c |
21 | * @brief OSS mixer support |
22 | * |
23 | * Mono output devices aren't explicitly supported (but may work |
24 | * nonetheless). |
25 | */ |
bd8895a8 |
26 | |
27 | #include <config.h> |
b25aac59 |
28 | |
29 | #if HAVE_SYS_SOUNDCARD_H |
30 | |
bd8895a8 |
31 | #include "types.h" |
32 | |
33 | #include <stdio.h> |
34 | #include <string.h> |
35 | #include <fcntl.h> |
36 | #include <unistd.h> |
37 | #include <stdlib.h> |
38 | #include <errno.h> |
39 | #include <stddef.h> |
40 | #include <sys/ioctl.h> |
b25aac59 |
41 | #include <sys/soundcard.h> |
bd8895a8 |
42 | |
43 | #include "configuration.h" |
44 | #include "mixer.h" |
45 | #include "log.h" |
46 | #include "syscalls.h" |
47 | |
bd8895a8 |
48 | /* documentation does not match implementation! */ |
49 | #ifndef SOUND_MIXER_READ |
50 | # define SOUND_MIXER_READ(x) MIXER_READ(x) |
51 | #endif |
52 | #ifndef SOUND_MIXER_WRITE |
53 | # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x) |
54 | #endif |
55 | |
b25aac59 |
56 | /** @brief Channel names */ |
bd8895a8 |
57 | static const char *channels[] = SOUND_DEVICE_NAMES; |
58 | |
b25aac59 |
59 | /** @brief Convert channel name to number */ |
bd8895a8 |
60 | static int mixer_channel(const char *c) { |
61 | unsigned n; |
62 | |
63 | if(!c[strspn(c, "0123456789")]) |
64 | return atoi(c); |
65 | else { |
66 | for(n = 0; n < sizeof channels / sizeof *channels; ++n) |
67 | if(!strcmp(channels[n], c)) |
68 | return n; |
69 | return -1; |
70 | } |
71 | } |
72 | |
b25aac59 |
73 | /** @brief Open the OSS mixer device and return its fd */ |
bd8895a8 |
74 | static int oss_do_open(void) { |
75 | int fd; |
76 | |
77 | if((fd = open(config->mixer, O_RDWR, 0)) < 0) |
78 | error(errno, "error opening %s", config->mixer); |
79 | return fd; |
80 | } |
81 | |
b25aac59 |
82 | /** @brief Get the OSS mixer setting */ |
bd8895a8 |
83 | static int oss_do_get(int *left, int *right, int fd, int ch) { |
84 | int r; |
85 | |
86 | if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) { |
87 | error(errno, "error reading %s channel %s", |
88 | config->mixer, config->channel); |
89 | return -1; |
90 | } |
91 | *left = r & 0xff; |
92 | *right = (r >> 8) & 0xff; |
93 | return 0; |
94 | } |
95 | |
b25aac59 |
96 | /** @brief Get OSS volume */ |
bd8895a8 |
97 | static int oss_get(int *left, int *right) { |
98 | int ch, fd; |
99 | |
100 | if(config->mixer |
101 | && config->channel |
102 | && (ch = mixer_channel(config->channel)) != -1) { |
103 | if((fd = oss_do_open()) < 0) |
104 | return -1; |
105 | if(oss_do_get(left, right, fd, ch) < 0) { |
106 | xclose(fd); |
107 | return -1; |
108 | } |
109 | xclose(fd); |
110 | return 0; |
111 | } else |
112 | return -1; |
113 | } |
114 | |
b25aac59 |
115 | /** @brief Set OSS volume */ |
bd8895a8 |
116 | static int oss_set(int *left, int *right) { |
117 | int ch, fd, r; |
118 | |
119 | if(config->mixer |
120 | && config->channel |
121 | && (ch = mixer_channel(config->channel)) != -1) { |
122 | if((fd = oss_do_open()) < 0) |
123 | return -1; |
124 | r = (*left & 0xff) + (*right & 0xff) * 256; |
125 | if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) { |
126 | error(errno, "error changing %s channel %s", |
127 | config->mixer, config->channel); |
128 | xclose(fd); |
129 | return -1; |
130 | } |
131 | if(oss_do_get(left, right, fd, ch) < 0) { |
132 | xclose(fd); |
133 | return -1; |
134 | } |
135 | xclose(fd); |
136 | return 0; |
137 | } else |
138 | return -1; |
139 | } |
140 | |
b25aac59 |
141 | /** @brief OSS mixer vtable */ |
bd8895a8 |
142 | const struct mixer mixer_oss = { |
143 | BACKEND_OSS, |
bd8895a8 |
144 | oss_get, |
145 | oss_set, |
146 | "/dev/mixer", |
147 | "pcm" |
148 | }; |
149 | #endif |
150 | |
151 | /* |
152 | Local Variables: |
153 | c-basic-offset:2 |
154 | comment-column:40 |
155 | End: |
156 | */ |