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2ba45a60 DM |
1 | /* |
2 | * ALSA input and output | |
3 | * Copyright (c) 2007 Luca Abeni ( lucabe72 email it ) | |
4 | * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr ) | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | /** | |
24 | * @file | |
25 | * ALSA input and output: definitions and structures | |
26 | * @author Luca Abeni ( lucabe72 email it ) | |
27 | * @author Benoit Fouet ( benoit fouet free fr ) | |
28 | */ | |
29 | ||
30 | #ifndef AVDEVICE_ALSA_AUDIO_H | |
31 | #define AVDEVICE_ALSA_AUDIO_H | |
32 | ||
33 | #include <alsa/asoundlib.h> | |
34 | #include "config.h" | |
35 | #include "libavutil/log.h" | |
36 | #include "timefilter.h" | |
37 | #include "avdevice.h" | |
38 | ||
39 | /* XXX: we make the assumption that the soundcard accepts this format */ | |
40 | /* XXX: find better solution with "preinit" method, needed also in | |
41 | other formats */ | |
42 | #define DEFAULT_CODEC_ID AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE) | |
43 | ||
44 | typedef void (*ff_reorder_func)(const void *, void *, int); | |
45 | ||
46 | #define ALSA_BUFFER_SIZE_MAX 65536 | |
47 | ||
48 | typedef struct AlsaData { | |
49 | AVClass *class; | |
50 | snd_pcm_t *h; | |
51 | int frame_size; ///< bytes per sample * channels | |
52 | int period_size; ///< preferred size for reads and writes, in frames | |
53 | int sample_rate; ///< sample rate set by user | |
54 | int channels; ///< number of channels set by user | |
55 | int last_period; | |
56 | TimeFilter *timefilter; | |
57 | void (*reorder_func)(const void *, void *, int); | |
58 | void *reorder_buf; | |
59 | int reorder_buf_size; ///< in frames | |
60 | int64_t timestamp; ///< current timestamp, without latency applied. | |
61 | } AlsaData; | |
62 | ||
63 | /** | |
64 | * Open an ALSA PCM. | |
65 | * | |
66 | * @param s media file handle | |
67 | * @param mode either SND_PCM_STREAM_CAPTURE or SND_PCM_STREAM_PLAYBACK | |
68 | * @param sample_rate in: requested sample rate; | |
69 | * out: actually selected sample rate | |
70 | * @param channels number of channels | |
71 | * @param codec_id in: requested AVCodecID or AV_CODEC_ID_NONE; | |
72 | * out: actually selected AVCodecID, changed only if | |
73 | * AV_CODEC_ID_NONE was requested | |
74 | * | |
75 | * @return 0 if OK, AVERROR_xxx on error | |
76 | */ | |
77 | int ff_alsa_open(AVFormatContext *s, snd_pcm_stream_t mode, | |
78 | unsigned int *sample_rate, | |
79 | int channels, enum AVCodecID *codec_id); | |
80 | ||
81 | /** | |
82 | * Close the ALSA PCM. | |
83 | * | |
84 | * @param s1 media file handle | |
85 | * | |
86 | * @return 0 | |
87 | */ | |
88 | int ff_alsa_close(AVFormatContext *s1); | |
89 | ||
90 | /** | |
91 | * Try to recover from ALSA buffer underrun. | |
92 | * | |
93 | * @param s1 media file handle | |
94 | * @param err error code reported by the previous ALSA call | |
95 | * | |
96 | * @return 0 if OK, AVERROR_xxx on error | |
97 | */ | |
98 | int ff_alsa_xrun_recover(AVFormatContext *s1, int err); | |
99 | ||
100 | int ff_alsa_extend_reorder_buf(AlsaData *s, int size); | |
101 | ||
f6fa7814 DM |
102 | int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type); |
103 | ||
2ba45a60 | 104 | #endif /* AVDEVICE_ALSA_AUDIO_H */ |