mpg123.h

<VC++视频音频开发>一书的光盘资料。

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#ifndef MPEG123_H
#define MPEG123_H

#include <stdio.h>
#include <string.h>
#include <signal.h>

#ifndef WIN32
# include <sys/signal.h>
# include <unistd.h>
#endif

#include <math.h>

#ifdef _WIN32
# undef WIN32
# define WIN32

# define M_PI       3.14159265358979323846
# define M_SQRT2	1.41421356237309504880
# define REAL_IS_FLOAT
# define NEW_DCT9

# define random rand
# define srandom srand

#endif

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

#define		AUDIOBUFSIZE		16384

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

#define         SBLIMIT                 32
#define         SSLIMIT                 18

#define         SCALE_BLOCK             12


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

#define MAXFRAMESIZE 1792



#define AUSHIFT (3)

typedef unsigned char  uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int   uint32_t;


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; 

    int II_sblimit;
    void *alloc;
};

struct parameter {
	int quiet;	
	int tryresync;  
	int verbose;    
	int checkrange;
};

extern uint8_t get1bit(void);
extern uint32_t getbits(int);
extern uint16_t getbits_fast(int);
extern int set_pointer(long);

extern unsigned char *wordpointer;
extern int bitindex;

extern void make_decode_tables(long scaleval);
extern int do_layer3(struct frame *fr,unsigned char *,int *);
extern int do_layer2(struct frame *fr,unsigned char *,int *);
extern int do_layer1(struct frame *fr,unsigned char *,int *);
extern int decode_header(struct frame *fr,unsigned long newhead);



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];
};

extern int synth_1to1 (real *,int,unsigned char *,int *);
extern int synth_1to1_mono (real *,unsigned char *,int *);
extern int synth_1to1_mono2stereo (real *,unsigned char *,int *);

extern int synth_2to1 (real *,int,unsigned char *,int *);
extern int synth_2to1_mono (real *,unsigned char *,int *);
extern int synth_2to1_mono2stereo (real *,unsigned char *,int *);

extern int synth_4to1 (real *,int,unsigned char *,int *);
extern int synth_4to1_mono (real *,unsigned char *,int *);
extern int synth_4to1_mono2stereo (real *,unsigned char *,int *);

extern int synth_ntom (real *,int,unsigned char *,int *);
extern int synth_ntom_mono (real *,unsigned char *,int *);
extern int synth_ntom_mono2stereo (real *,unsigned char *,int *);

extern void rewindNbits(int bits);
extern int  hsstell(void);
extern int get_songlen(struct frame *fr,int no);

extern void init_layer3(int);
extern void init_layer2(void);
extern void make_decode_tables(long scale);
extern void dct64(real *,real *,real *);

extern void synth_ntom_set_step(long,long);

extern long freqs[9];
extern real muls[27][64];
extern real decwin[512+32];
extern real *pnts[5];

extern struct parameter param;

#endif