mpg123.h

音频编码

#ifndef MPG123_H_INCLUDED
#define MPG123_H_INCLUDED

#include        <stdio.h>

#ifdef STDC_HEADERS
# include <string.h>
#else
# ifndef HAVE_STRCHR
#  define strchr index
#  define strrchr rindex
# endif
char *strchr (), *strrchr ();
# ifndef HAVE_MEMCPY
#  define memcpy(d, s, n) bcopy ((s), (d), (n))
#  define memmove(d, s, n) bcopy ((s), (d), (n))
# endif
#endif

#include        <signal.h>


#if defined(__riscos__) && defined(FPA10)
#include	"ymath.h"
#else
#include	<math.h>
#endif

#ifndef M_PI
#define M_PI       3.14159265358979323846
#endif
#ifndef M_SQRT2
#define M_SQRT2    1.41421356237309504880
#endif

#ifndef FALSE
#define         FALSE                   0
#endif
#ifndef TRUE
#define         TRUE                    1
#endif

#define REAL_IS_FLOAT

#ifdef REAL_IS_FLOAT
#  define real float
#elif defined(REAL_IS_LONG_DOUBLE)
#  define real long double
#else
#  define real double
#endif

#define         FALSE                   0
#define         TRUE                    1

#define         SBLIMIT                 32
#define         SSLIMIT                 18

#define         MPG_MD_STEREO           0
#define         MPG_MD_JOINT_STEREO     1
#define         MPG_MD_DUAL_CHANNEL     2
#define         MPG_MD_MONO             3

#define MAXFRAMESIZE 2880

/* AF: ADDED FOR LAYER1/LAYER2 */
#define         SCALE_BLOCK             12


/* Pre Shift fo 16 to 8 bit converter table */
#define AUSHIFT (3)

struct frame {
    int stereo;
    int jsbound;
    int single;
    int lsf;
    int mpeg25;
    int header_change;
    int lay;
    int error_protection;
    int bitrate_index;
    int sampling_frequency;
    int padding;
    int extension;
    int mode;
    int mode_ext;
    int copyright;
    int original;
    int emphasis;
    int framesize; /* computed framesize */

	/* AF: ADDED FOR LAYER1/LAYER2 */
#if defined(USE_LAYER_2) || defined(USE_LAYER_1)
    int II_sblimit;
    struct al_table2 *alloc;
	int down_sample_sblimit;
	int	down_sample;

#endif

};

struct gr_info_s {
      int scfsi;
      unsigned part2_3_length;
      unsigned big_values;
      unsigned scalefac_compress;
      unsigned block_type;
      unsigned mixed_block_flag;
      unsigned table_select[3];
      unsigned subblock_gain[3];
      unsigned maxband[3];
      unsigned maxbandl;
      unsigned maxb;
      unsigned region1start;
      unsigned region2start;
      unsigned preflag;
      unsigned scalefac_scale;
      unsigned count1table_select;
      real *full_gain[3];
      real *pow2gain;
};

struct III_sideinfo
{
  unsigned main_data_begin;
  unsigned private_bits;
  struct {
    struct gr_info_s gr[2];
  } ch[2];
};


#endif