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 | * |
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 | |
05b75f8d | 27 | #include "common.h" |
b25aac59 | 28 | |
29 | #if HAVE_SYS_SOUNDCARD_H | |
30 | ||
bd8895a8 | 31 | #include <fcntl.h> |
32 | #include <unistd.h> | |
bd8895a8 | 33 | #include <errno.h> |
34 | #include <stddef.h> | |
35 | #include <sys/ioctl.h> | |
b25aac59 | 36 | #include <sys/soundcard.h> |
bd8895a8 | 37 | |
38 | #include "configuration.h" | |
39 | #include "mixer.h" | |
40 | #include "log.h" | |
41 | #include "syscalls.h" | |
a35bb7cc | 42 | #include "mem.h" |
bd8895a8 | 43 | |
bd8895a8 | 44 | /* documentation does not match implementation! */ |
45 | #ifndef SOUND_MIXER_READ | |
46 | # define SOUND_MIXER_READ(x) MIXER_READ(x) | |
47 | #endif | |
48 | #ifndef SOUND_MIXER_WRITE | |
49 | # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x) | |
50 | #endif | |
51 | ||
b25aac59 | 52 | /** @brief Channel names */ |
bd8895a8 | 53 | static const char *channels[] = SOUND_DEVICE_NAMES; |
54 | ||
b25aac59 | 55 | /** @brief Convert channel name to number */ |
bd8895a8 | 56 | static int mixer_channel(const char *c) { |
57 | unsigned n; | |
58 | ||
59 | if(!c[strspn(c, "0123456789")]) | |
60 | return atoi(c); | |
61 | else { | |
62 | for(n = 0; n < sizeof channels / sizeof *channels; ++n) | |
63 | if(!strcmp(channels[n], c)) | |
64 | return n; | |
65 | return -1; | |
66 | } | |
67 | } | |
68 | ||
b25aac59 | 69 | /** @brief Open the OSS mixer device and return its fd */ |
bd8895a8 | 70 | static int oss_do_open(void) { |
71 | int fd; | |
72 | ||
a35bb7cc RK |
73 | if((fd = open(config->mixer, O_RDWR, 0)) < 0) { |
74 | static char *reported; | |
75 | ||
76 | if(!reported || strcmp(reported, config->mixer)) { | |
77 | if(reported) | |
78 | xfree(reported); | |
79 | reported = xstrdup(config->mixer); | |
80 | error(errno, "error opening %s", config->mixer); | |
81 | } | |
82 | } | |
bd8895a8 | 83 | return fd; |
84 | } | |
85 | ||
b25aac59 | 86 | /** @brief Get the OSS mixer setting */ |
bd8895a8 | 87 | static int oss_do_get(int *left, int *right, int fd, int ch) { |
88 | int r; | |
89 | ||
90 | if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) { | |
91 | error(errno, "error reading %s channel %s", | |
92 | config->mixer, config->channel); | |
93 | return -1; | |
94 | } | |
95 | *left = r & 0xff; | |
96 | *right = (r >> 8) & 0xff; | |
97 | return 0; | |
98 | } | |
99 | ||
b25aac59 | 100 | /** @brief Get OSS volume */ |
bd8895a8 | 101 | static int oss_get(int *left, int *right) { |
102 | int ch, fd; | |
103 | ||
104 | if(config->mixer | |
105 | && config->channel | |
106 | && (ch = mixer_channel(config->channel)) != -1) { | |
107 | if((fd = oss_do_open()) < 0) | |
108 | return -1; | |
109 | if(oss_do_get(left, right, fd, ch) < 0) { | |
110 | xclose(fd); | |
111 | return -1; | |
112 | } | |
113 | xclose(fd); | |
114 | return 0; | |
115 | } else | |
116 | return -1; | |
117 | } | |
118 | ||
b25aac59 | 119 | /** @brief Set OSS volume */ |
bd8895a8 | 120 | static int oss_set(int *left, int *right) { |
121 | int ch, fd, r; | |
122 | ||
123 | if(config->mixer | |
124 | && config->channel | |
125 | && (ch = mixer_channel(config->channel)) != -1) { | |
126 | if((fd = oss_do_open()) < 0) | |
127 | return -1; | |
128 | r = (*left & 0xff) + (*right & 0xff) * 256; | |
129 | if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) { | |
130 | error(errno, "error changing %s channel %s", | |
131 | config->mixer, config->channel); | |
132 | xclose(fd); | |
133 | return -1; | |
134 | } | |
135 | if(oss_do_get(left, right, fd, ch) < 0) { | |
136 | xclose(fd); | |
137 | return -1; | |
138 | } | |
139 | xclose(fd); | |
140 | return 0; | |
141 | } else | |
142 | return -1; | |
143 | } | |
144 | ||
b25aac59 | 145 | /** @brief OSS mixer vtable */ |
bd8895a8 | 146 | const struct mixer mixer_oss = { |
147 | BACKEND_OSS, | |
bd8895a8 | 148 | oss_get, |
149 | oss_set, | |
150 | "/dev/mixer", | |
151 | "pcm" | |
152 | }; | |
153 | #endif | |
154 | ||
155 | /* | |
156 | Local Variables: | |
157 | c-basic-offset:2 | |
158 | comment-column:40 | |
159 | End: | |
160 | */ |