fmt123.h

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/*
    libmpg123: MPEG Audio Decoder library
 
    separate header just for audio format definitions not tied to
    library code
 
    copyright 1995-2020 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
 
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    )
};
 
#define MPG123_SAMPLESIZE(enc) ( \
    (enc) < 1 \
    ?   0 \
    :   ( (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 \
)   )   )   )   )   )
 
#define MPG123_ZEROSAMPLE(enc, siz, off) ( \
    (enc) == MPG123_ENC_ULAW_8 \
    ?   (off == 0 ? 0xff : 0x00) \
    :   ( (enc) == MPG123_ENC_ALAW_8 \
        ?   (off == 0 ? 0xd5 : 0x00) \
        :   ( (((enc) & (MPG123_ENC_SIGNED|MPG123_ENC_FLOAT)) || (siz) != ((off)+1)) \
            ?   0x00 \
            :   0x80 \
    )   )   )
 
struct mpg123_fmt
{
    long rate;    
    int channels; 
    int encoding;
};
 
/* @} */
 
#endif