/usr/include/fmt123.h is in libmpg123-dev 1.25.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | /*
libmpg123: MPEG Audio Decoder library
separate header just for audio format definitions not tied to
library code
copyright 1995-2015 by the mpg123 project
free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
*/
#ifndef MPG123_ENC_H
#define MPG123_ENC_H
/** \file fmt123.h Audio format definitions. */
/** \defgroup mpg123_enc mpg123 PCM sample encodings
* These are definitions for audio formats used by libmpg123 and
* libout123.
*
* @{
*/
/** An enum over all sample types possibly known to mpg123.
* The values are designed as bit flags to allow bitmasking for encoding
* families.
* This is also why the enum is not used as type for actual encoding variables,
* plain integers (at least 16 bit, 15 bit being used) cover the possible
* combinations of these flags.
*
* Note that (your build of) libmpg123 does not necessarily support all these.
* Usually, you can expect the 8bit encodings and signed 16 bit.
* Also 32bit float will be usual beginning with mpg123-1.7.0 .
* What you should bear in mind is that (SSE, etc) optimized routines may be
* absent for some formats. We do have SSE for 16, 32 bit and float, though.
* 24 bit integer is done via postprocessing of 32 bit output -- just cutting
* the last byte, no rounding, even. If you want better, do it yourself.
*
* All formats are in native byte order. If you need different endinaness, you
* can simply postprocess the output buffers (libmpg123 wouldn't do anything
* else). The macro MPG123_SAMPLESIZE() can be helpful there.
*/
enum mpg123_enc_enum
{
/* 0000 0000 0000 1111 Some 8 bit integer encoding. */
MPG123_ENC_8 = 0x00f
/* 0000 0000 0100 0000 Some 16 bit integer encoding. */
, MPG123_ENC_16 = 0x040
/* 0100 0000 0000 0000 Some 24 bit integer encoding. */
, MPG123_ENC_24 = 0x4000
/* 0000 0001 0000 0000 Some 32 bit integer encoding. */
, MPG123_ENC_32 = 0x100
/* 0000 0000 1000 0000 Some signed integer encoding. */
, MPG123_ENC_SIGNED = 0x080
/* 0000 1110 0000 0000 Some float encoding. */
, MPG123_ENC_FLOAT = 0xe00
/* 0000 0000 1101 0000 signed 16 bit */
, MPG123_ENC_SIGNED_16 = (MPG123_ENC_16|MPG123_ENC_SIGNED|0x10)
/* 0000 0000 0110 0000 unsigned 16 bit */
, MPG123_ENC_UNSIGNED_16 = (MPG123_ENC_16|0x20)
/* 0000 0000 0000 0001 unsigned 8 bit */
, MPG123_ENC_UNSIGNED_8 = 0x01
/* 0000 0000 1000 0010 signed 8 bit */
, MPG123_ENC_SIGNED_8 = (MPG123_ENC_SIGNED|0x02)
/* 0000 0000 0000 0100 ulaw 8 bit */
, MPG123_ENC_ULAW_8 = 0x04
/* 0000 0000 0000 1000 alaw 8 bit */
, MPG123_ENC_ALAW_8 = 0x08
/* 0001 0001 1000 0000 signed 32 bit */
, MPG123_ENC_SIGNED_32 = MPG123_ENC_32|MPG123_ENC_SIGNED|0x1000
/* 0010 0001 0000 0000 unsigned 32 bit */
, MPG123_ENC_UNSIGNED_32 = MPG123_ENC_32|0x2000
/* 0101 0000 1000 0000 signed 24 bit */
, MPG123_ENC_SIGNED_24 = MPG123_ENC_24|MPG123_ENC_SIGNED|0x1000
/* 0110 0000 0000 0000 unsigned 24 bit */
, MPG123_ENC_UNSIGNED_24 = MPG123_ENC_24|0x2000
/* 0000 0010 0000 0000 32bit float */
, MPG123_ENC_FLOAT_32 = 0x200
/* 0000 0100 0000 0000 64bit float */
, MPG123_ENC_FLOAT_64 = 0x400
/* Any possibly known encoding from the list above. */
, MPG123_ENC_ANY = ( MPG123_ENC_SIGNED_16 | MPG123_ENC_UNSIGNED_16
| MPG123_ENC_UNSIGNED_8 | MPG123_ENC_SIGNED_8
| MPG123_ENC_ULAW_8 | MPG123_ENC_ALAW_8
| MPG123_ENC_SIGNED_32 | MPG123_ENC_UNSIGNED_32
| MPG123_ENC_SIGNED_24 | MPG123_ENC_UNSIGNED_24
| MPG123_ENC_FLOAT_32 | MPG123_ENC_FLOAT_64 )
};
/** Get size of one PCM sample with given encoding.
* This is included both in libmpg123 and libout123. Both offer
* an API function to provide the macro results from library
* compile-time, not that of you application. This most likely
* does not matter as I do not expect any fresh PCM sample
* encoding to appear. But who knows? Perhaps the encoding type
* will be abused for funny things in future, not even plain PCM.
* And, by the way: Thomas really likes the ?: operator.
* \param enc the encoding (mpg123_enc_enum value)
* \return size of one sample in bytes
*/
#define MPG123_SAMPLESIZE(enc) ( \
(enc) & MPG123_ENC_8 \
? 1 \
: ( (enc) & MPG123_ENC_16 \
? 2 \
: ( (enc) & MPG123_ENC_24 \
? 3 \
: ( ( (enc) & MPG123_ENC_32 \
|| (enc) == MPG123_ENC_FLOAT_32 ) \
? 4 \
: ( (enc) == MPG123_ENC_FLOAT_64 \
? 8 \
: 0 \
) ) ) ) )
/** Structure defining an audio format.
* Providing the members as individual function arguments to define a certain
* output format is easy enough. This struct makes is more comfortable to deal
* with a list of formats.
* Negative values for the members might be used to communicate use of default
* values.
*/
struct mpg123_fmt
{
long rate; /**< sampling rate in Hz */
int channels; /**< channel count */
/** encoding code, can be single value or bitwise or of members of
* mpg123_enc_enum */
int encoding;
};
/* @} */
#endif
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