| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007 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 lib/wav.h |
| 21 | * @brief WAV file support |
| 22 | */ |
| 23 | |
| 24 | #ifndef WAV_H |
| 25 | #define WAV_H |
| 26 | |
| 27 | /** @brief WAV file access structure */ |
| 28 | struct wavfile { |
| 29 | /** @brief File descriptor onto file */ |
| 30 | int fd; |
| 31 | |
| 32 | /** @brief File length */ |
| 33 | off_t length; |
| 34 | |
| 35 | /** @brief Offset of data chunk */ |
| 36 | off_t data; |
| 37 | |
| 38 | /** @brief Sample rate (Hz) */ |
| 39 | int rate; |
| 40 | |
| 41 | /** @brief Number of channels (usually 1 or 2) */ |
| 42 | int channels; |
| 43 | |
| 44 | /** @brief Bits per sample */ |
| 45 | int bits; |
| 46 | |
| 47 | /** @brief Size of data chunk in bytes */ |
| 48 | off_t datasize; |
| 49 | }; |
| 50 | |
| 51 | /** @brief Sample data callback from wav_data() |
| 52 | * @param f WAV file being read |
| 53 | * @param data Pointer to sample data |
| 54 | * @param nbytes Number of bytes of data |
| 55 | * @param u As passed to wav_data() |
| 56 | * @return 0 on success or an errno value on error |
| 57 | * |
| 58 | * @p nbytes is always a multiple of the frame size and never 0. |
| 59 | */ |
| 60 | typedef int wav_data_callback(struct wavfile *f, |
| 61 | const char *data, |
| 62 | size_t nbytes, |
| 63 | void *u); |
| 64 | |
| 65 | int wav_init(struct wavfile *f, const char *path); |
| 66 | void wav_destroy(struct wavfile *f); |
| 67 | int wav_data(struct wavfile *f, |
| 68 | wav_data_callback *callback, |
| 69 | void *u); |
| 70 | |
| 71 | #endif /* WAV_H */ |
| 72 | |
| 73 | /* |
| 74 | Local Variables: |
| 75 | c-basic-offset:2 |
| 76 | comment-column:40 |
| 77 | fill-column:79 |
| 78 | indent-tabs-mode:nil |
| 79 | End: |
| 80 | */ |