l3side.h

MP3编码的完整实现(源代码和使用例子都有)

/**********************************************************************
 *   date   programmers                comment                        *
 * 25. 6.92  Toshiyuki Ishino          Ver 1.0                        *
 * 29.10.92  Masahiro Iwadare          Ver 2.0                        *
 * 17. 4.93  Masahiro Iwadare          Updated for IS Modification    *
 *                                                                    *
 *********************************************************************/

#ifndef L3_SIDE_H
#define L3_SIDE_H
#include "encoder.h"
#include "machine.h"

/* Layer III side information. */

typedef FLOAT8	D576[576];
typedef int	I576[576];
typedef FLOAT8	D192_3[192][3];
typedef int	I192_3[192][3];


typedef struct {
	FLOAT8	l[SBPSY_l + 1];
	FLOAT8	s[SBPSY_s + 1][3];
} III_psy_xmin;

typedef struct {
    III_psy_xmin thm;
    III_psy_xmin en;
} III_psy_ratio;

typedef struct {
	unsigned part2_3_length;
	unsigned big_values;
	unsigned count1;
 	unsigned global_gain;
	unsigned scalefac_compress;
	unsigned window_switching_flag;
	unsigned block_type;
	unsigned mixed_block_flag;
	unsigned table_select[3];
int /*	unsigned */ subblock_gain[3];
	unsigned region0_count;
	unsigned region1_count;
	unsigned preflag;
	unsigned scalefac_scale;
	unsigned count1table_select;

	unsigned part2_length;
	unsigned sfb_lmax;
	unsigned sfb_smax;
	unsigned count1bits;
	/* added for LSF */
	unsigned *sfb_partition_table;
	unsigned slen[4];
} gr_info;

typedef struct {
	int main_data_begin; /* unsigned -> int */
	unsigned private_bits;
	int resvDrain;
	unsigned scfsi[2][4];
	struct {
		struct gr_info_ss {
			gr_info tt;
			} ch[2];
		} gr[2];
	} III_side_info_t;

/* Layer III scale factors. */
/* note: there are only SBPSY_l=(SBMAX_l-1) and SBPSY_s=(SBMAX_s-1) scalefactors.
 * Dont know why these would be dimensioned SBMAX_l and SBMAX-s */
typedef struct {
	int l[SBMAX_l];            /* [cb] */
	int s[SBMAX_s][3];         /* [window][cb] */
} III_scalefac_t;  /* [gr][ch] */

#endif