| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2009 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 3 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, |
| 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 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | /** @file lib/resample.h |
| 20 | * @brief Audio resampling |
| 21 | */ |
| 22 | |
| 23 | #ifndef RESAMPLE_H |
| 24 | #define RESAMPLE_H |
| 25 | |
| 26 | #if HAVE_SAMPLERATE_H |
| 27 | #include <samplerate.h> |
| 28 | #endif |
| 29 | |
| 30 | #include "byte-order.h" |
| 31 | |
| 32 | /** @brief An audio resampler */ |
| 33 | struct resampler { |
| 34 | /** @brief Bits/sample in input */ |
| 35 | int input_bits; |
| 36 | |
| 37 | /** @brief Number of input channels */ |
| 38 | int input_channels; |
| 39 | |
| 40 | /** @brief Frames/second in input */ |
| 41 | int input_rate; |
| 42 | |
| 43 | /** @brief Whether input samples are signed or unsigned */ |
| 44 | int input_signed; |
| 45 | |
| 46 | /** @brief Input endianness (@c ENDIAN_BIG or @c ENDIAN_LITTLE) */ |
| 47 | int input_endian; |
| 48 | |
| 49 | /** @brief Bits/sample in output */ |
| 50 | int output_bits; |
| 51 | |
| 52 | /** @brief Number of output channels */ |
| 53 | int output_channels; |
| 54 | |
| 55 | /** @brief Frames/second in output */ |
| 56 | int output_rate; |
| 57 | |
| 58 | /** @brief Whether output samples are signed or unsigned */ |
| 59 | int output_signed; |
| 60 | |
| 61 | /** @brief Output endianness (@c ENDIAN_BIG or @c ENDIAN_LITTLE) */ |
| 62 | int output_endian; |
| 63 | |
| 64 | /** @brief */ |
| 65 | int input_bytes_per_sample; |
| 66 | |
| 67 | /** @brief */ |
| 68 | int input_bytes_per_frame; |
| 69 | #if HAVE_SAMPLERATE_H |
| 70 | /** @brief Libsamplerate handle */ |
| 71 | SRC_STATE *state; |
| 72 | #endif |
| 73 | }; |
| 74 | |
| 75 | void resample_init(struct resampler *rs, |
| 76 | int input_bits, int input_channels, |
| 77 | int input_rate, int input_signed, |
| 78 | int input_endian, |
| 79 | int output_bits, int output_channels, |
| 80 | int output_rate, int output_signed, |
| 81 | int output_endian); |
| 82 | size_t resample_convert(const struct resampler *rs, |
| 83 | const uint8_t *bytes, |
| 84 | size_t nbytes, |
| 85 | int eof, |
| 86 | void (*converted)(uint8_t *bytes, |
| 87 | size_t nbytes, |
| 88 | void *cd), |
| 89 | void *cd); |
| 90 | void resample_close(struct resampler *rs); |
| 91 | |
| 92 | #endif /* RESAMPLE_H */ |
| 93 | |
| 94 | /* |
| 95 | Local Variables: |
| 96 | c-basic-offset:2 |
| 97 | comment-column:40 |
| 98 | fill-column:79 |
| 99 | indent-tabs-mode:nil |
| 100 | End: |
| 101 | */ |