www.pudn.com > shine.zip > bitstream.h

//    Shine is an MP3 encoder 
//    Copyright (C) 1999-2000  Gabriel Bouvigne 
// 
//    This library is free software; you can redistribute it and/or 
//    modify it under the terms of the GNU Library General Public 
//    License as published by the Free Software Foundation; either 
//    version 2 of the License, or (at your option) any later version. 
// 
//    This library is distributed in the hope that it will be useful, 
//    but WITHOUT ANY WARRANTY; without even the implied warranty of 
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
//    Library General Public License for more details. 
 
 
#ifndef BITSTREAM_H 
#define BITSTREAM_H 
 
#include "types.h" 
 
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) */ 
} bitstream_t; 
 
/* "bit_stream.h" Definitions */ 
 
#define         MINIMUM         4    /* Minimum size of the buffer in bytes */ 
#define         MAX_LENGTH      32   /* Maximum length of word written or 
                                        read from bit stream */ 
#define         READ_MODE       0 
#define         WRITE_MODE      1 
#define         ALIGNING        8 
#define         BINARY          0 
#define         ASCII           1 
 
#define         TRUE            1 
#define         FALSE           0 
 
#ifndef BS_FORMAT 
#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)) 
 
 
int refill_buffer(bitstream_t *bs); 
void empty_buffer(bitstream_t *bs,int minimum); 
void open_bit_stream_w(bitstream_t *bs,char *bs_filenam,int size); 
void open_bit_stream_r(bitstream_t *bs,char *bs_filenam,int size); 
void close_bit_stream_r(bitstream_t *bs); 
void alloc_buffer(bitstream_t *bs,int size); 
void desalloc_buffer(bitstream_t *bs); 
void back_track_buffer(bitstream_t *bs,int N); 
unsigned int get1bit(bitstream_t *bs); 
void put1bit(bitstream_t *bs,int bit); 
unsigned long look_ahead(bitstream_t *bs,int N); 
unsigned long getbits(bitstream_t *bs,int N); 
void putbits(bitstream_t *bs,unsigned int val,int N); 
void byte_ali_putbits(bitstream_t *bs,unsigned int val,int N); 
unsigned long byte_ali_getbits(bitstream_t *bs,int N); 
unsigned long sstell(bitstream_t *bs); 
int end_bs(bitstream_t *bs); 
int seek_sync(bitstream_t *bs,long sync,int N); 
 
unsigned long hgetbits(int N); 
#define  hget1bit() hgetbits(1) 
 
#endif