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1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2008 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 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 | */ | |
20 | /** @file alsabg.h | |
21 | * @brief Background-thread interface to ALSA | |
22 | * | |
23 | * This wraps ALSA with an interface which calls back to the client from a | |
24 | * thread. It's not intended for completely general use, just what DisOrder | |
25 | * needs. | |
26 | */ | |
27 | ||
28 | #ifndef ALSABG_H | |
29 | #define ALSABG_H | |
30 | ||
31 | /** @brief Supply audio callback | |
32 | * @param dst Where to write audio data | |
33 | * @param nsamples Number of samples to write | |
34 | * | |
35 | * This function should write up to @p *nsamples samples of data at | |
36 | * @p dst, and return the number of samples written, or -1 if some error | |
37 | * occurred. It will be called in a background thread. | |
38 | */ | |
39 | typedef int alsa_bg_supply(void *dst, | |
2956aeb4 | 40 | unsigned nsamples_max); |
4dadf1a2 | 41 | |
2956aeb4 | 42 | void alsa_bg_init(const char *dev, |
4dadf1a2 RK |
43 | alsa_bg_supply *supply); |
44 | ||
45 | void alsa_bg_enable(void); | |
46 | ||
47 | void alsa_bg_disable(void); | |
48 | ||
49 | void alsa_bg_close(void); | |
50 | ||
51 | #endif /* ALSABG_H */ | |
52 | ||
53 | /* | |
54 | Local Variables: | |
55 | c-basic-offset:2 | |
56 | comment-column:40 | |
57 | fill-column:79 | |
58 | indent-tabs-mode:nil | |
59 | End: | |
60 | */ |