1 | /*
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2 | * Copyright (c) 2011 Jan Vesely
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | *
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9 | * - Redistributions of source code must retain the above copyright
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10 | * notice, this list of conditions and the following disclaimer.
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11 | * - Redistributions in binary form must reproduce the above copyright
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12 | * notice, this list of conditions and the following disclaimer in the
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13 | * documentation and/or other materials provided with the distribution.
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14 | * - The name of the author may not be used to endorse or promote products
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15 | * derived from this software without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 | */
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28 | /** @addtogroup wavplay
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29 | * @{
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30 | */
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31 | /** @file
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32 | * @brief .wav file format.
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33 | */
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34 | #ifndef WAVE_H
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35 | #define WAVE_H
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36 |
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37 | #include <stdint.h>
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38 | #include <pcm/format.h>
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39 | #include <pcm/sample_format.h>
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40 |
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41 | /** Wave file header format.
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42 | *
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43 | * https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
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44 | * @note: 8-bit samples are stored as unsigned bytes,
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45 | * 16-bit samples are stored as signed integers.
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46 | * @note: The default byte ordering assumed for WAVE data files is
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47 | * little-endian. Files written using the big-endian byte ordering scheme have
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48 | * the identifier RIFX instead of RIFF.
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49 | */
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50 | typedef struct wave_header {
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51 | /** Should be 'R', 'I', 'F', 'F'. */
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52 | char chunk_id[4];
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53 | #define CHUNK_ID "RIFF"
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54 |
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55 | /** Total size minus the first 8 bytes */
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56 | uint32_t chunk_size;
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57 | /** Should be 'W', 'A', 'V', 'E'. */
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58 | char format[4];
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59 | #define FORMAT_STR "WAVE"
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60 |
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61 | /** Should be 'f', 'm', 't', ' '. */
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62 | char subchunk1_id[4];
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63 | #define SUBCHUNK1_ID "fmt "
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64 |
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65 | /** Size of the ret of this subchunk. 16 for PCM file. */
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66 | uint32_t subchunk1_size;
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67 | #define PCM_SUBCHUNK1_SIZE 16
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68 | /** Format. 1 for Linear PCM */
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69 | uint16_t audio_format;
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70 | #define FORMAT_LINEAR_PCM 1
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71 | /** Number of channels. */
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72 | uint16_t channels;
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73 | /** Sampling rate. */
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74 | uint32_t sampling_rate;
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75 | /** Byte rate. */
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76 | uint32_t byte_rate;
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77 | /** Block align. Bytes in one block (samples for all channels). */
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78 | uint16_t block_align;
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79 | /** Bits per sample (one channel). */
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80 | uint16_t sample_size;
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81 |
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82 | /** Should be 'd', 'a', 't', 'a'. */
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83 | char subchunk2_id[4];
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84 | #define SUBCHUNK2_ID "data"
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85 | /** Audio data size. */
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86 | uint32_t subchunk2_size;
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87 | /** Audio data. */
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88 | uint8_t data[];
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89 |
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90 | } wave_header_t;
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91 |
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92 | errno_t wav_parse_header(const void *, const void **, size_t *, unsigned *,
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93 | unsigned *, pcm_sample_format_t *, const char **);
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94 |
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95 | void wav_init_header(wave_header_t *, pcm_format_t, size_t);
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96 | #endif
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97 | /**
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98 | * @}
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99 | */
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