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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * ALSA input and output |
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| 3 | * Copyright (c) 2007 Luca Abeni ( lucabe72 email it ) |
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| 4 | * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr ) |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | /** |
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| 24 | * @file |
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| 25 | * ALSA input and output: definitions and structures |
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| 26 | * @author Luca Abeni ( lucabe72 email it ) |
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| 27 | * @author Benoit Fouet ( benoit fouet free fr ) |
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| 28 | */ |
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| 29 | |||
| 30 | #ifndef AVDEVICE_ALSA_AUDIO_H |
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| 31 | #define AVDEVICE_ALSA_AUDIO_H |
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| 32 | |||
| 33 | #include |
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| 34 | #include "config.h" |
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| 35 | #include "libavutil/log.h" |
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| 36 | #include "timefilter.h" |
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| 37 | #include "avdevice.h" |
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| 38 | |||
| 39 | /* XXX: we make the assumption that the soundcard accepts this format */ |
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| 40 | /* XXX: find better solution with "preinit" method, needed also in |
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| 41 | other formats */ |
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| 42 | #define DEFAULT_CODEC_ID AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE) |
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| 43 | |||
| 44 | typedef void (*ff_reorder_func)(const void *, void *, int); |
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| 45 | |||
| 46 | #define ALSA_BUFFER_SIZE_MAX 65536 |
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| 47 | |||
| 48 | typedef struct AlsaData { |
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| 49 | AVClass *class; |
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| 50 | snd_pcm_t *h; |
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| 51 | int frame_size; ///< bytes per sample * channels |
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| 52 | int period_size; ///< preferred size for reads and writes, in frames |
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| 53 | int sample_rate; ///< sample rate set by user |
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| 54 | int channels; ///< number of channels set by user |
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| 55 | int last_period; |
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| 56 | TimeFilter *timefilter; |
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| 57 | void (*reorder_func)(const void *, void *, int); |
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| 58 | void *reorder_buf; |
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| 59 | int reorder_buf_size; ///< in frames |
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| 60 | } AlsaData; |
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| 61 | |||
| 62 | /** |
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| 63 | * Open an ALSA PCM. |
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| 64 | * |
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| 65 | * @param s media file handle |
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| 66 | * @param mode either SND_PCM_STREAM_CAPTURE or SND_PCM_STREAM_PLAYBACK |
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| 67 | * @param sample_rate in: requested sample rate; |
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| 68 | * out: actually selected sample rate |
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| 69 | * @param channels number of channels |
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| 70 | * @param codec_id in: requested AVCodecID or AV_CODEC_ID_NONE; |
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| 71 | * out: actually selected AVCodecID, changed only if |
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| 72 | * AV_CODEC_ID_NONE was requested |
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| 73 | * |
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| 74 | * @return 0 if OK, AVERROR_xxx on error |
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| 75 | */ |
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| 76 | int ff_alsa_open(AVFormatContext *s, snd_pcm_stream_t mode, |
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| 77 | unsigned int *sample_rate, |
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| 78 | int channels, enum AVCodecID *codec_id); |
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| 79 | |||
| 80 | /** |
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| 81 | * Close the ALSA PCM. |
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| 82 | * |
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| 83 | * @param s1 media file handle |
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| 84 | * |
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| 85 | * @return 0 |
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| 86 | */ |
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| 87 | int ff_alsa_close(AVFormatContext *s1); |
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| 88 | |||
| 89 | /** |
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| 90 | * Try to recover from ALSA buffer underrun. |
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| 91 | * |
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| 92 | * @param s1 media file handle |
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| 93 | * @param err error code reported by the previous ALSA call |
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| 94 | * |
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| 95 | * @return 0 if OK, AVERROR_xxx on error |
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| 96 | */ |
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| 97 | int ff_alsa_xrun_recover(AVFormatContext *s1, int err); |
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| 98 | |||
| 99 | int ff_alsa_extend_reorder_buf(AlsaData *s, int size); |
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| 100 | |||
| 101 | #endif /* AVDEVICE_ALSA_AUDIO_H */ |