common.h

MPEG 2的音频编码软件。喜欢多媒体的开发人员可以看看。

#define         BS_FORMAT       ASCII /* BINARY or ASCII = 2x bytes */
#endif

#define         BUFFER_SIZE     4096

#define         MIN(A, B)       ((A) < (B) ? (A) : (B))
#define         MAX(A, B)       ((A) > (B) ? (A) : (B))

/***********************************************************************
*
*  Global Type Definitions
*
***********************************************************************/

/* Structure for Reading Layer II Allocation Tables from File */

typedef struct {
    unsigned int    steps;
    unsigned int    bits;
    unsigned int    group;
    unsigned int    quant;
} sb_alloc, *alloc_ptr;

typedef sb_alloc        al_table[SBLIMIT][16];

/* Header Information Structure */

typedef struct {
    int version;
    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;
} layer, *the_layer;

/* Parent Structure Interpreting some Frame Parameters in Header */

typedef struct {
    layer       *header;        /* raw header information */
    int         actual_mode;    /* when writing IS, may forget if 0 chs */
    al_table    *alloc;         /* bit allocation table read in */
    int         tab_num;        /* number of table as loaded */
    int         stereo;         /* 1 for mono, 2 for stereo */
    int         jsbound;        /* first band of joint stereo coding */
    int         sblimit;        /* total number of sub bands */
} frame_params;


/* AIFF Definitions */

#define IFF_ID_FORM 0x464f524d /* "FORM" */
#define IFF_ID_AIFF 0x41494646 /* "AIFF" */
#define IFF_ID_COMM 0x434f4d4d /* "COMM" */
#define IFF_ID_SSND 0x53534e44 /* "SSND" */
#define IFF_ID_MPEG 0x4d504547 /* "MPEG" */

#define AIFF_FORM_HEADER_SIZE 12
#define AIFF_SSND_HEADER_SIZE 16


typedef struct  blockAlign_struct {
    unsigned long   offset;
    unsigned long   blockSize;
} blockAlign;

typedef struct  IFF_AIFF_struct {
    short           numChannels;
    unsigned long   numSampleFrames;
    short           sampleSize;
    double          sampleRate;
    unsigned long   sampleType;
    blockAlign      blkAlgn;
} IFF_AIFF;

enum byte_order { order_unknown, order_bigEndian, order_littleEndian };
extern enum byte_order NativeByteOrder;

/* "bit_stream.h" Type Definitions */

typedef struct  bit_stream_struc {
    FILE        *pt;            /* pointer to bit stream device */
    unsigned char *buf;         /* bit stream buffer */
    int         buf_size;       /* size of buffer (in number of bytes) */
    long        totbit;         /* bit counter of bit stream */
    int         buf_byte_idx;   /* pointer to top byte in buffer */
    int         buf_bit_idx;    /* pointer to top bit of top byte in buffer */
    int         mode;           /* bit stream open in read or write mode */
    int         eob;            /* end of buffer index */
    int         eobs;           /* end of bit stream flag */
    char        format;
    
    /* format of file in rd mode (BINARY/ASCII) */
} Bit_stream_struc;

#include "l3side.h"

/***********************************************************************
*
*  Global Variable External Declarations
*
***********************************************************************/

extern char     *mode_names[4];
extern char     *layer_names[3];
extern char	*version_names[2];
extern double   s_freq[2][4];
extern int      bitrate[2][3][15];
extern double FAR multiple[64];

/***********************************************************************
*
*  Global Function Prototype Declarations
*
***********************************************************************/

/* The following functions are in the file "common.c" */

#ifdef  PROTO_ARGS
extern FILE           *OpenTableFile(char*);
extern int            read_bit_alloc(int, al_table*);
extern int            pick_table(frame_params*);
extern int            js_bound(int, int);
extern void           hdr_to_frps(frame_params*);
extern void           WriteHdr(frame_params*, FILE*);
extern void           WriteBitAlloc(unsigned int[2][SBLIMIT], frame_params*,
                        FILE*);
extern void           WriteScale(unsigned int[2][SBLIMIT],
                        unsigned int[2][SBLIMIT], unsigned int[2][3][SBLIMIT],
                        frame_params*, FILE*);
extern void           WriteSamples(int, unsigned int FAR [SBLIMIT],
                        unsigned int[SBLIMIT], frame_params*, FILE*);
extern int            NumericQ(char*);
extern int            BitrateIndex(int, int, int);
extern int            SmpFrqIndex(long, int*);
extern int            memcheck(char*, int, int);
extern void           FAR *mem_alloc(unsigned long, char*);
extern void           mem_free(void**);
extern void           double_to_extended(double*, char[10]);
extern void           extended_to_double(char[10], double*);
extern int            aiff_read_headers(FILE*, IFF_AIFF*);
extern int            aiff_seek_to_sound_data(FILE*);
extern int            aiff_write_headers(FILE*, IFF_AIFF*);
extern int            refill_buffer(Bit_stream_struc*);
extern void           empty_buffer(Bit_stream_struc*, int);
extern void           open_bit_stream_w(Bit_stream_struc*, char*, int);
extern void           open_bit_stream_r(Bit_stream_struc*, char*, int);
extern void           close_bit_stream_r(Bit_stream_struc*);
extern void           close_bit_stream_w(Bit_stream_struc*);
extern void           alloc_buffer(Bit_stream_struc*, int);
extern void           desalloc_buffer(Bit_stream_struc*);
extern void           back_track_buffer(Bit_stream_struc*, int);
extern unsigned int   get1bit(Bit_stream_struc*);
extern void           put1bit(Bit_stream_struc*, int);
extern unsigned long  look_ahead(Bit_stream_struc*, int);
extern unsigned long  getbits(Bit_stream_struc*, int);
extern void           putbits(Bit_stream_struc*, unsigned int, int);
extern void           byte_ali_putbits(Bit_stream_struc*, unsigned int, int);
extern unsigned long  byte_ali_getbits(Bit_stream_struc*, int);
extern unsigned long  sstell(Bit_stream_struc*);
extern int            end_bs(Bit_stream_struc*);
extern int            seek_sync(Bit_stream_struc*, long, int);
extern void           I_CRC_calc(frame_params*, unsigned int[2][SBLIMIT],
                        unsigned int*);
extern void           II_CRC_calc(frame_params*, unsigned int[2][SBLIMIT],
                        unsigned int[2][SBLIMIT], unsigned int*);
extern void           update_CRC(unsigned int, unsigned int, unsigned int*);
extern void           read_absthr(FLOAT*, int);
extern unsigned int   hget1bit(); /* MI */
extern unsigned long  hgetbits(int);
extern unsigned long  hsstell();
extern void           hputbuf(unsigned int,int);
extern enum byte_order DetermineByteOrder();
extern void SwapBytesInWords( short *loc, int words );


#ifdef  MACINTOSH
extern void           set_mac_file_attr(char[MAX_NAME_SIZE], short, OSType,
                        OSType);
#endif
#ifdef MS_DOS
extern void           new_ext(char *filename, char *extname, char *newname); 
#endif

#else
extern FILE           *OpenTableFile();
extern int            read_bit_alloc();
extern int            pick_table();
extern int            js_bound();
extern void           hdr_to_frps();
extern void           WriteHdr();
extern void           WriteBitAlloc();
extern void           WriteScale();
extern void           WriteSamples();
extern int            NumericQ();
extern int            BitrateIndex();
extern int            SmpFrqIndex();
extern int            memcheck();
extern void           FAR *mem_alloc();
extern void           mem_free();
extern void           double_to_extended();
extern void           extended_to_double();
extern int            aiff_read_headers();
extern int            aiff_seek_to_sound_data();
extern int            aiff_write_headers();
extern int            refill_buffer();
extern void           empty_buffer();
extern void           open_bit_stream_w();
extern void           open_bit_stream_r();
extern void           close_bit_stream_r();
extern void           close_bit_stream_w();
extern void           alloc_buffer();
extern void           desalloc_buffer();
extern void           back_track_buffer();
extern unsigned int   get1bit();
extern void           put1bit();
extern unsigned long  look_ahead();
extern unsigned long  getbits();
extern void           putbits();
extern void           byte_ali_putbits();
extern unsigned long  byte_ali_getbits();
extern unsigned long  sstell();
extern int            end_bs();
extern int            seek_sync();
extern void           I_CRC_calc();
extern void           II_CRC_calc();
extern void           update_CRC();
extern void           read_absthr();

extern unsigned int   hget1bit();
extern unsigned long  hgetbits();
extern unsigned long  hsstell();
extern void           hputbuf();

#ifdef MS_DOS
extern void           new_ext(); 
#endif
#endif
#endif