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1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2009 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 3 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, | |
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 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | /** @file lib/uaudio.h | |
20 | * @brief Uniform audio interface | |
21 | */ | |
22 | ||
23 | #ifndef UAUDIO_H | |
24 | #define UAUDIO_H | |
25 | ||
4fd38868 RK |
26 | extern int uaudio_rate; |
27 | extern int uaudio_bits; | |
28 | extern int uaudio_channels; | |
29 | extern int uaudio_signed; | |
30 | extern size_t uaudio_sample_size; | |
31 | ||
7a2c7068 RK |
32 | /** @brief Callback to get audio data |
33 | * @param buffer Where to put audio data | |
34 | * @param max_samples How many samples to supply | |
35 | * @param userdata As passed to uaudio_open() | |
36 | * @return Number of samples filled | |
d4170ca7 RK |
37 | * |
38 | * This function should not block if possible (better to fill the buffer with | |
39 | * 0s) and should definitely not block indefinitely. This great caution with | |
40 | * any locks or syscalls! In particular avoid it taking a lock that may be | |
41 | * held while any of the @ref uaudio members are called. | |
42 | * | |
43 | * If it's more convenient, it's OK to return less than the maximum number of | |
44 | * samples (including 0) provided you expect to be called again for more | |
45 | * samples immediately. | |
7a2c7068 | 46 | */ |
4fd38868 | 47 | typedef size_t uaudio_callback(void *buffer, |
7a2c7068 RK |
48 | size_t max_samples, |
49 | void *userdata); | |
50 | ||
4fd38868 RK |
51 | /** @brief Callback to play audio data |
52 | * @param buffer Pointer to audio buffer | |
53 | * @param samples Number of samples to play | |
54 | * @return Number of samples played | |
55 | * | |
56 | * Used with uaudio_thread_start() etc. | |
57 | */ | |
58 | typedef size_t uaudio_playcallback(void *buffer, size_t samples); | |
59 | ||
7a2c7068 RK |
60 | /** @brief Audio API definition */ |
61 | struct uaudio { | |
62 | /** @brief Name of this API */ | |
63 | const char *name; | |
64 | ||
65 | /** @brief List of options, terminated by NULL */ | |
66 | const char *const *options; | |
67 | ||
68 | /** @brief Do slow setup | |
69 | * @param ua Handle returned by uaudio_open() | |
70 | * @param callback Called for audio data | |
71 | * @param userdata Passed to @p callback | |
72 | * | |
73 | * This does resource-intensive setup for the output device. | |
74 | * | |
75 | * For instance it might open mixable audio devices or network sockets. It | |
76 | * will create any background thread required. However, it must not exclude | |
77 | * other processes from outputting sound. | |
78 | */ | |
79 | void (*start)(uaudio_callback *callback, | |
80 | void *userdata); | |
81 | ||
82 | /** @brief Tear down | |
83 | * @param ua Handle returned by uaudio_open() | |
84 | * | |
85 | * This undoes the effect of @c start. | |
86 | */ | |
87 | void (*stop)(void); | |
88 | ||
89 | /** @brief Enable output | |
90 | * | |
91 | * A background thread will start calling @c callback as set by @c | |
92 | * start and playing the audio data received from it. | |
93 | */ | |
94 | void (*activate)(void); | |
95 | ||
96 | /** @brief Disable output | |
97 | * | |
98 | * The background thread will stop calling @c callback. | |
99 | */ | |
100 | void (*deactivate)(void); | |
101 | ||
b50cfb8a RK |
102 | /** @brief Open mixer device */ |
103 | void (*open_mixer)(void); | |
104 | ||
105 | /** @brief Closer mixer device */ | |
106 | void (*close_mixer)(void); | |
107 | ||
108 | /** @brief Get volume | |
109 | * @param left Where to put the left-channel value | |
110 | * @param right Where to put the right-channel value | |
111 | * | |
112 | * 0 is silent and 100 is maximum volume. | |
113 | */ | |
114 | void (*get_volume)(int *left, int *right); | |
115 | ||
116 | /** @brief Set volume | |
117 | * @param left Pointer to left-channel value (updated) | |
118 | * @param right Pointer to right-channel value (updated) | |
119 | * | |
120 | * The values are updated with those actually set by the underlying system | |
121 | * call. | |
122 | * | |
123 | * 0 is silent and 100 is maximum volume. | |
124 | */ | |
125 | void (*set_volume)(int *left, int *right); | |
ba70caca RK |
126 | |
127 | /** @brief Set configuration */ | |
128 | void (*configure)(void); | |
b50cfb8a | 129 | |
7a2c7068 | 130 | }; |
4fd38868 RK |
131 | |
132 | void uaudio_set_format(int rate, int channels, int samplesize, int signed_); | |
7a2c7068 | 133 | void uaudio_set(const char *name, const char *value); |
b50cfb8a | 134 | char *uaudio_get(const char *name, const char *default_value); |
4fd38868 RK |
135 | void uaudio_thread_start(uaudio_callback *callback, |
136 | void *userdata, | |
137 | uaudio_playcallback *playcallback, | |
138 | size_t min, | |
63761c19 RK |
139 | size_t max, |
140 | unsigned flags); | |
141 | ||
142 | /** @brief Fake pauses | |
143 | * | |
144 | * This flag is used for audio backends that cannot sensibly be paused. | |
145 | * The thread support code will supply silence while deactivated in this | |
146 | * case. | |
147 | */ | |
148 | #define UAUDIO_THREAD_FAKE_PAUSE 0x00000001 | |
149 | ||
4fd38868 RK |
150 | void uaudio_thread_stop(void); |
151 | void uaudio_thread_activate(void); | |
152 | void uaudio_thread_deactivate(void); | |
ec57f6c9 RK |
153 | void uaudio_schedule_synchronize(void); |
154 | void uaudio_schedule_update(size_t written_samples); | |
155 | void uaudio_schedule_init(void); | |
b50cfb8a | 156 | const struct uaudio *uaudio_find(const char *name); |
ec57f6c9 RK |
157 | |
158 | extern uint64_t uaudio_schedule_timestamp; | |
159 | extern int uaudio_schedule_reactivated; | |
7a2c7068 RK |
160 | |
161 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H | |
162 | extern const struct uaudio uaudio_coreaudio; | |
163 | #endif | |
164 | ||
165 | #if HAVE_ALSA_ASOUNDLIB_H | |
166 | extern const struct uaudio uaudio_alsa; | |
167 | #endif | |
168 | ||
169 | #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST | |
170 | extern const struct uaudio uaudio_oss; | |
171 | #endif | |
172 | ||
173 | extern const struct uaudio uaudio_rtp; | |
174 | ||
66288757 | 175 | extern const struct uaudio uaudio_command; |
7a2c7068 | 176 | |
5b053666 | 177 | extern const struct uaudio *const uaudio_apis[]; |
efd23a80 | 178 | |
7a2c7068 RK |
179 | #endif /* UAUDIO_H */ |
180 | ||
181 | /* | |
182 | Local Variables: | |
183 | c-basic-offset:2 | |
184 | comment-column:40 | |
185 | fill-column:79 | |
186 | indent-tabs-mode:nil | |
187 | End: | |
188 | */ |