ref: 29ccab8aacdd3a0bb3d8c5b74fc54ece925384fd
dir: /libentcode/entdec.h/
#if !defined(_entdec_H)
# define _entdec_H (1)
# include "entcode.h"
typedef struct ec_dec ec_dec;
/*The entropy decoder.*/
struct ec_dec{
/*The buffer to decode.*/
ec_byte_buffer *buf;
/*The remainder of a buffered input symbol.*/
int rem;
/*The number of values in the current range.*/
ec_uint32 rng;
/*The difference between the input value and the lowest value in the current
range.*/
ec_uint32 dif;
/*Normalization factor.*/
ec_uint32 nrm;
};
/*Initializes the decoder.
_buf: The input buffer to use.
Return: 0 on success, or a negative value on error.*/
void ec_dec_init(ec_dec *_this,ec_byte_buffer *_buf);
/*Calculates the cumulative frequency for the next symbol.
This can then be fed into the probability model to determine what that
symbol is, and the additional frequency information required to advance to
the next symbol.
This function cannot be called more than once without a corresponding call to
ec_dec_update(), or decoding will not proceed correctly.
_ft: The total frequency of the symbols in the alphabet the next symbol was
encoded with.
Return: A cumulative frequency representing the encoded symbol.
If the cumulative frequency of all the symbols before the one that
was encoded was fl, and the cumulative frequency of all the symbols
up to and including the one encoded is fh, then the returned value
will fall in the range [fl,fh).*/
unsigned ec_decode(ec_dec *_this,unsigned _ft);
/*Advance the decoder past the next symbol using the frequency information the
symbol was encoded with.
Exactly one call to ec_decode() must have been made so that all necessary
intermediate calculations are performed.
_fl: The cumulative frequency of all symbols that come before the symbol
decoded.
_fh: The cumulative frequency of all symbols up to and including the symbol
Together with _fl, this defines the range [_fl,_fh) in which the value
returned above must fall.
_ft: The total frequency of the symbols in the alphabet the symbol decoded
was encoded in.
This must be the same as passed to the preceding call to ec_decode().*/
void ec_dec_update(ec_dec *_this,unsigned _fl,unsigned _fh,
unsigned _ft);
/*Extracts a sequence of raw bits from the stream.
The bits must have been encoded with ec_enc_bits().
No call to ec_dec_update() is necessary after this call.
_ftb: The number of bits to extract.
This must be at least one, and no more than 32.
Return: The decoded bits.*/
ec_uint32 ec_dec_bits(ec_dec *_this,int _ftb);
/*Extracts a raw unsigned integer with a non-power-of-2 range from the stream.
The bits must have been encoded with ec_enc_uint().
No call to ec_dec_update() is necessary after this call.
_ft: The number of integers that can be decoded (one more than the max).
This must be at least one, and no more than 2**32-1.
Return: The decoded bits.*/
ec_uint32 ec_dec_uint(ec_dec *_this,ec_uint32 _ft);
#endif