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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
bd8895a8 | 3 | * Copyright (C) 2007 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 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 |
460b9539 | 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 | * | |
460b9539 | 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/>. |
460b9539 | 17 | */ |
b25aac59 | 18 | /** @file lib/mixer.c |
19 | * @brief Mixer support | |
20 | */ | |
460b9539 | 21 | |
05b75f8d | 22 | #include "common.h" |
460b9539 | 23 | |
460b9539 | 24 | #include "configuration.h" |
25 | #include "mixer.h" | |
26 | #include "log.h" | |
b25aac59 | 27 | #include "mem.h" |
460b9539 | 28 | |
b25aac59 | 29 | /** @brief Whether lack of volume support has been reported yet */ |
30 | static int none_reported; | |
31 | ||
32 | /** @brief Get/set volume stub if volume control is not supported */ | |
33 | static int none_get_set(int attribute((unused)) *left, | |
34 | int attribute((unused)) *right) { | |
35 | if(!none_reported) { | |
36 | error(0, "don't know how to get/set volume with this api"); | |
37 | none_reported = 1; | |
38 | } | |
39 | return -1; | |
40 | } | |
41 | ||
42 | /** @brief Stub mixer control */ | |
43 | static const struct mixer mixer_none = { | |
44 | -1, | |
45 | none_get_set, | |
46 | none_get_set, | |
47 | "", | |
48 | "" | |
49 | }; | |
50 | ||
51 | /** @brief Table of mixer definitions */ | |
bd8895a8 | 52 | static const struct mixer *mixers[] = { |
460b9539 | 53 | #if HAVE_SYS_SOUNDCARD_H |
b25aac59 | 54 | &mixer_oss, |
55 | #endif | |
56 | #if HAVE_ALSA_ASOUNDLIB_H | |
57 | &mixer_alsa, | |
460b9539 | 58 | #endif |
b25aac59 | 59 | &mixer_none /* make sure array is never empty */ |
bd8895a8 | 60 | }; |
460b9539 | 61 | |
b25aac59 | 62 | /** @brief Number of mixer definitions */ |
bd8895a8 | 63 | #define NMIXERS (sizeof mixers / sizeof *mixers) |
64 | ||
b25aac59 | 65 | /** @brief Find the mixer definition */ |
bd8895a8 | 66 | static const struct mixer *find_mixer(int api) { |
67 | size_t n; | |
68 | ||
3c499fe7 RK |
69 | if(api == -1) |
70 | api = config->api; | |
bd8895a8 | 71 | for(n = 0; n < NMIXERS; ++n) |
72 | if(mixers[n]->api == api) | |
73 | return mixers[n]; | |
b25aac59 | 74 | return &mixer_none; |
460b9539 | 75 | } |
76 | ||
3c499fe7 RK |
77 | /** @brief Return true if we know how to drive the mixer |
78 | * @param api Sound api or -1 for default | |
79 | * @return true if suppored, false otherwise | |
80 | */ | |
81 | int mixer_supported(int api) { | |
82 | const struct mixer *const m = find_mixer(api); | |
83 | return m != &mixer_none; | |
84 | } | |
85 | ||
b25aac59 | 86 | /** @brief Get/set volume |
3c499fe7 | 87 | * @param api Sound api or -1 for default |
b25aac59 | 88 | * @param left Left channel level, 0-100 |
89 | * @param right Right channel level, 0-100 | |
90 | * @param set Set volume if non-0 | |
91 | * @return 0 on success, non-0 on error | |
92 | * | |
93 | * If getting the volume then @p left and @p right are filled in. | |
94 | * | |
95 | * If setting the volume then the target levels are read from @p left and | |
96 | * @p right, and the actual level set is stored in them. | |
97 | */ | |
3c499fe7 RK |
98 | int mixer_control(int api, int *left, int *right, int set) { |
99 | const struct mixer *const m = find_mixer(api); | |
bd8895a8 | 100 | |
b25aac59 | 101 | /* We impose defaults bizarrely late, but this has the advantage of |
102 | * not making everything depend on sound libraries */ | |
103 | if(!config->mixer) | |
104 | config->mixer = xstrdup(m->device); | |
105 | if(!config->channel) | |
106 | config->channel = xstrdup(m->channel); | |
107 | if(set) | |
108 | return m->set(left, right); | |
109 | else | |
110 | return m->get(left, right); | |
460b9539 | 111 | } |
460b9539 | 112 | |
113 | /* | |
114 | Local Variables: | |
115 | c-basic-offset:2 | |
116 | comment-column:40 | |
117 | End: | |
118 | */ |