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1 | /* |
2 | * This file is part of DisOrder |
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3 | * Copyright (C) 2007 Richard Kettlewell |
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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 | */ |
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20 | /** @file lib/mixer.c |
21 | * @brief Mixer support |
22 | */ |
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23 | |
24 | #include <config.h> |
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25 | #include "types.h" |
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26 | |
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27 | #include "configuration.h" |
28 | #include "mixer.h" |
29 | #include "log.h" |
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30 | #include "mem.h" |
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31 | |
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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 */ |
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55 | static const struct mixer *mixers[] = { |
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56 | #if HAVE_SYS_SOUNDCARD_H |
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57 | &mixer_oss, |
58 | #endif |
59 | #if HAVE_ALSA_ASOUNDLIB_H |
60 | &mixer_alsa, |
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61 | #endif |
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62 | &mixer_none /* make sure array is never empty */ |
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63 | }; |
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64 | |
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65 | /** @brief Number of mixer definitions */ |
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66 | #define NMIXERS (sizeof mixers / sizeof *mixers) |
67 | |
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68 | /** @brief Find the mixer definition */ |
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69 | static const struct mixer *find_mixer(int api) { |
70 | size_t n; |
71 | |
72 | for(n = 0; n < NMIXERS; ++n) |
73 | if(mixers[n]->api == api) |
74 | return mixers[n]; |
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75 | return &mixer_none; |
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76 | } |
77 | |
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78 | /** @brief Get/set volume |
79 | * @param left Left channel level, 0-100 |
80 | * @param right Right channel level, 0-100 |
81 | * @param set Set volume if non-0 |
82 | * @return 0 on success, non-0 on error |
83 | * |
84 | * If getting the volume then @p left and @p right are filled in. |
85 | * |
86 | * If setting the volume then the target levels are read from @p left and |
87 | * @p right, and the actual level set is stored in them. |
88 | */ |
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89 | int mixer_control(int *left, int *right, int set) { |
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90 | const struct mixer *const m = find_mixer(config->api); |
91 | |
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92 | /* We impose defaults bizarrely late, but this has the advantage of |
93 | * not making everything depend on sound libraries */ |
94 | if(!config->mixer) |
95 | config->mixer = xstrdup(m->device); |
96 | if(!config->channel) |
97 | config->channel = xstrdup(m->channel); |
98 | if(set) |
99 | return m->set(left, right); |
100 | else |
101 | return m->get(left, right); |
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102 | } |
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103 | |
104 | /* |
105 | Local Variables: |
106 | c-basic-offset:2 |
107 | comment-column:40 |
108 | End: |
109 | */ |