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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
bd8895a8 | 3 | * Copyright (C) 2007 Richard Kettlewell |
460b9539 | 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.c |
21 | * @brief Mixer support | |
22 | */ | |
460b9539 | 23 | |
24 | #include <config.h> | |
6d2d327c | 25 | #include "types.h" |
460b9539 | 26 | |
460b9539 | 27 | #include "configuration.h" |
28 | #include "mixer.h" | |
29 | #include "log.h" | |
b25aac59 | 30 | #include "mem.h" |
460b9539 | 31 | |
b25aac59 | 32 | /** @brief Whether lack of volume support has been reported yet */ |
33 | static int none_reported; | |
34 | ||
35 | /** @brief Get/set volume stub if volume control is not supported */ | |
36 | static int none_get_set(int attribute((unused)) *left, | |
37 | int attribute((unused)) *right) { | |
38 | if(!none_reported) { | |
39 | error(0, "don't know how to get/set volume with this api"); | |
40 | none_reported = 1; | |
41 | } | |
42 | return -1; | |
43 | } | |
44 | ||
45 | /** @brief Stub mixer control */ | |
46 | static const struct mixer mixer_none = { | |
47 | -1, | |
48 | none_get_set, | |
49 | none_get_set, | |
50 | "", | |
51 | "" | |
52 | }; | |
53 | ||
54 | /** @brief Table of mixer definitions */ | |
bd8895a8 | 55 | static const struct mixer *mixers[] = { |
460b9539 | 56 | #if HAVE_SYS_SOUNDCARD_H |
b25aac59 | 57 | &mixer_oss, |
58 | #endif | |
59 | #if HAVE_ALSA_ASOUNDLIB_H | |
60 | &mixer_alsa, | |
460b9539 | 61 | #endif |
b25aac59 | 62 | &mixer_none /* make sure array is never empty */ |
bd8895a8 | 63 | }; |
460b9539 | 64 | |
b25aac59 | 65 | /** @brief Number of mixer definitions */ |
bd8895a8 | 66 | #define NMIXERS (sizeof mixers / sizeof *mixers) |
67 | ||
b25aac59 | 68 | /** @brief Find the mixer definition */ |
bd8895a8 | 69 | static const struct mixer *find_mixer(int api) { |
70 | size_t n; | |
71 | ||
3c499fe7 RK |
72 | if(api == -1) |
73 | api = config->api; | |
bd8895a8 | 74 | for(n = 0; n < NMIXERS; ++n) |
75 | if(mixers[n]->api == api) | |
76 | return mixers[n]; | |
b25aac59 | 77 | return &mixer_none; |
460b9539 | 78 | } |
79 | ||
3c499fe7 RK |
80 | /** @brief Return true if we know how to drive the mixer |
81 | * @param api Sound api or -1 for default | |
82 | * @return true if suppored, false otherwise | |
83 | */ | |
84 | int mixer_supported(int api) { | |
85 | const struct mixer *const m = find_mixer(api); | |
86 | return m != &mixer_none; | |
87 | } | |
88 | ||
b25aac59 | 89 | /** @brief Get/set volume |
3c499fe7 | 90 | * @param api Sound api or -1 for default |
b25aac59 | 91 | * @param left Left channel level, 0-100 |
92 | * @param right Right channel level, 0-100 | |
93 | * @param set Set volume if non-0 | |
94 | * @return 0 on success, non-0 on error | |
95 | * | |
96 | * If getting the volume then @p left and @p right are filled in. | |
97 | * | |
98 | * If setting the volume then the target levels are read from @p left and | |
99 | * @p right, and the actual level set is stored in them. | |
100 | */ | |
3c499fe7 RK |
101 | int mixer_control(int api, int *left, int *right, int set) { |
102 | const struct mixer *const m = find_mixer(api); | |
bd8895a8 | 103 | |
b25aac59 | 104 | /* We impose defaults bizarrely late, but this has the advantage of |
105 | * not making everything depend on sound libraries */ | |
106 | if(!config->mixer) | |
107 | config->mixer = xstrdup(m->device); | |
108 | if(!config->channel) | |
109 | config->channel = xstrdup(m->channel); | |
110 | if(set) | |
111 | return m->set(left, right); | |
112 | else | |
113 | return m->get(left, right); | |
460b9539 | 114 | } |
460b9539 | 115 | |
116 | /* | |
117 | Local Variables: | |
118 | c-basic-offset:2 | |
119 | comment-column:40 | |
120 | End: | |
121 | */ |