mpg123.h

MP3的代码很实用 MP3的代码很实用

/*
 * $Id: mpg123.h,v 1.1.1.1 2004/12/22 10:02:33 zyu Exp $
 */

#ifndef MPG123_H
#define MPG123_H

#define FL2FIX(x, frac)	((x)*(1<<(frac)))
#define FIX2FL(x, frac)	((x)/(1<<(frac)))

#define FLOAT13		long
#define FLOAT19		long
#define FLOAT21		long
#define FLOAT24		long
#define FIX13(x)	((FLOAT13)FL2FIX((x), 13))
#define FIX19(x)	((FLOAT19)FL2FIX((x), 19))
#define FIX21(x)	((FLOAT21)FL2FIX((x), 21))
#define FIX24(x)	((FLOAT24)FL2FIX((x), 24))


#define MUL24(x,y)	((((x)>>6) * ((y)>>11)) >> 7)
//#define MUL24OUT(win, b)	(((win) * ((b)>>9))>>15)
#define MUL24OUT(b, win)	(((b)>>12) * ((win))>>12)

#define NEED_AIFF

#define MMA

#ifdef MMA
extern volatile int * const mrambase;
extern volatile int * const mmamoder;
extern volatile int * const mmastatr;
extern volatile int * const mmabufxar;
extern volatile int * const mmabufzar;
#endif

# define M_PI       	FIX15(3.14159265358979323846)
# define M_SQRT2	FIX15(1.41421356237309504880)
# define NEW_DCT9

#define real		FLOAT24

/* AUDIOBUFSIZE = n*64 with n=1,2,3 ...  */
#define		AUDIOBUFSIZE		16384

#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 1792

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 */
};

//extern unsigned int   get1bit(void);
extern unsigned int   getbits(int);
extern unsigned int   getbits_fast(int);
extern int set_pointer(long);
extern int do_layer3(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;
      int full_gain[3];
      int pow2gain;
};

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

struct bandInfoStruct {
  short longIdx[23];
  short longDiff[22];
  short shortIdx[14];
  short shortDiff[13];
};


extern int synth_1to1 (real *,int,unsigned char *,int *);
extern int synth_1to1_mono (real *,unsigned char *,int *);
extern void init_layer3(int);



extern real muls[27][64];
extern real decwin[(512+32)/2+16];
extern real cos4[1];
extern real cos8[2];
extern real cos16[4];
extern real cos32[8];
extern real cos64[16];
extern real *pnts[5];
extern real hybridIn[2][SBLIMIT][SSLIMIT];
extern real hybridOut[2][SSLIMIT][SBLIMIT];
extern struct III_sideinfo sideinfo;

extern int tabsel_123[2][3][16];
extern long freqs[9];
extern unsigned char main_databuf[512+512+MAXFRAMESIZE];
extern unsigned char *main_dataend;
extern real win1[4][36];
extern int longLimit[9][23];
extern int shortLimit[9][14];
extern int *map[9][3];
extern int *mapend[9][3];
extern real b0x[16];
extern struct bandInfoStruct bandInfo[];
extern real gainpow2[4];
extern real ispow[130];
extern real aa_ca[8];
extern real aa_cs[8];
extern real COS1[12][6];
extern real win[4][36];
extern real COS9[9];
extern real tfcos36[9];
extern real tfcos12[3];
extern real COS6_1;
extern real COS6_2;
extern real pow1_1[2][16];
extern real pow2_1[2][16];
extern real pow1_2[2][16];
extern real pow2_2[2][16];
extern real tan1_1[16];
extern real tan2_1[16];
extern real tan1_2[16];
extern real tan2_2[16];


extern unsigned char *bufpointer;
extern int bitindex;
extern struct mpstr gmp;
extern unsigned char rval;
extern unsigned char *pcm_sample;
extern int pcm_point;
#endif /* MPG123_H */