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Multiplier-free entropy coder

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This commit is contained in:
Timothy B. Terriberry 2007-12-06 15:09:53 +11:00 • committed by Jean-Marc Valin
parent aeb4467d7f
commit 2ec8d9e522
26 changed files with 1597 additions and 2 deletions
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49
libentcode/entcode.h Normal file
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#if !defined(_entcode_H)
# define _entcode_H (1)
# include <limits.h>
# include "ecintrin.h"
typedef unsigned ec_uint32;
typedef struct ec_byte_buffer ec_byte_buffer;
/*The number of bits to code at a time when coding bits directly.*/
# define EC_UNIT_BITS (8)
/*The mask for the given bits.*/
# define EC_UNIT_MASK ((1U<<EC_UNIT_BITS)-1)
/*Simple libogg1-style buffer.*/
struct ec_byte_buffer{
unsigned char *buf;
unsigned char *ptr;
long storage;
};
/*Encoding functions.*/
void ec_byte_writeinit(ec_byte_buffer *_b);
void ec_byte_writetrunc(ec_byte_buffer *_b,long _bytes);
void ec_byte_write1(ec_byte_buffer *_b,unsigned _value);
void ec_byte_write4(ec_byte_buffer *_b,ec_uint32 _value);
void ec_byte_writecopy(ec_byte_buffer *_b,void *_source,long _bytes);
void ec_byte_writeclear(ec_byte_buffer *_b);
/*Decoding functions.*/
void ec_byte_readinit(ec_byte_buffer *_b,unsigned char *_buf,long _bytes);
int ec_byte_look1(ec_byte_buffer *_b);
int ec_byte_look4(ec_byte_buffer *_b,ec_uint32 *_val);
void ec_byte_adv1(ec_byte_buffer *_b);
void ec_byte_adv4(ec_byte_buffer *_b);
int ec_byte_read1(ec_byte_buffer *_b);
int ec_byte_read4(ec_byte_buffer *_b,ec_uint32 *_val);
/*Shared functions.*/
void ec_byte_reset(ec_byte_buffer *_b);
long ec_byte_bytes(ec_byte_buffer *_b);
unsigned char *ec_byte_get_buffer(ec_byte_buffer *_b);
int ec_ilog(ec_uint32 _v);
#endif