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1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2008 Richard Kettlewell | |
4 | * | |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
4dadf1a2 | 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 |
4dadf1a2 | 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 | * | |
4dadf1a2 | 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/>. |
4dadf1a2 RK |
17 | */ |
18 | /** @file alsabg.h | |
19 | * @brief Background-thread interface to ALSA | |
20 | * | |
21 | * This wraps ALSA with an interface which calls back to the client from a | |
22 | * thread. It's not intended for completely general use, just what DisOrder | |
23 | * needs. | |
24 | */ | |
25 | ||
26 | #ifndef ALSABG_H | |
27 | #define ALSABG_H | |
28 | ||
29 | /** @brief Supply audio callback | |
30 | * @param dst Where to write audio data | |
31 | * @param nsamples Number of samples to write | |
4d82d579 | 32 | * @return Number of samples written |
4dadf1a2 RK |
33 | * |
34 | * This function should write up to @p *nsamples samples of data at | |
35 | * @p dst, and return the number of samples written, or -1 if some error | |
36 | * occurred. It will be called in a background thread. | |
37 | */ | |
38 | typedef int alsa_bg_supply(void *dst, | |
2956aeb4 | 39 | unsigned nsamples_max); |
4dadf1a2 | 40 | |
2956aeb4 | 41 | void alsa_bg_init(const char *dev, |
4dadf1a2 RK |
42 | alsa_bg_supply *supply); |
43 | ||
44 | void alsa_bg_enable(void); | |
45 | ||
46 | void alsa_bg_disable(void); | |
47 | ||
48 | void alsa_bg_close(void); | |
49 | ||
50 | #endif /* ALSABG_H */ | |
51 | ||
52 | /* | |
53 | Local Variables: | |
54 | c-basic-offset:2 | |
55 | comment-column:40 | |
56 | fill-column:79 | |
57 | indent-tabs-mode:nil | |
58 | End: | |
59 | */ |