520 lines
18 KiB
C
520 lines
18 KiB
C
|
// File: crn_symbol_codec.h
|
||
|
|
// See Copyright Notice and license at the end of inc/crnlib.h
|
||
|
|
#pragma once
|
||
|
|
#include "crn_prefix_coding.h"
|
||
|
|
|
||
|
|
namespace crnlib
|
||
|
|
{
|
||
|
|
class symbol_codec;
|
||
|
|
class adaptive_arith_data_model;
|
||
|
|
|
||
|
|
const uint cSymbolCodecArithMinLen = 0x01000000U;
|
||
|
|
const uint cSymbolCodecArithMaxLen = 0xFFFFFFFFU;
|
||
|
|
|
||
|
|
const uint cSymbolCodecArithProbBits = 11;
|
||
|
|
const uint cSymbolCodecArithProbScale = 1 << cSymbolCodecArithProbBits;
|
||
|
|
const uint cSymbolCodecArithProbMoveBits = 5;
|
||
|
|
|
||
|
|
const uint cSymbolCodecArithProbMulBits = 8;
|
||
|
|
const uint cSymbolCodecArithProbMulScale = 1 << cSymbolCodecArithProbMulBits;
|
||
|
|
|
||
|
|
class symbol_histogram
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
inline symbol_histogram(uint size = 0) : m_hist(size) { }
|
||
|
|
|
||
|
|
inline void clear() { m_hist.clear(); }
|
||
|
|
|
||
|
|
inline uint size() const { return static_cast<uint>(m_hist.size()); }
|
||
|
|
|
||
|
|
inline void inc_freq(uint x, uint amount = 1)
|
||
|
|
{
|
||
|
|
uint h = m_hist[x];
|
||
|
|
CRNLIB_ASSERT( amount <= (0xFFFFFFFF - h) );
|
||
|
|
m_hist[x] = h + amount;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void set_all(uint val) { for (uint i = 0; i < m_hist.size(); i++) m_hist[i] = val; }
|
||
|
|
|
||
|
|
inline void resize(uint new_size) { m_hist.resize(new_size); }
|
||
|
|
|
||
|
|
inline const uint* get_ptr() const { return m_hist.empty() ? NULL : &m_hist.front(); }
|
||
|
|
|
||
|
|
double calc_entropy() const;
|
||
|
|
|
||
|
|
uint operator[] (uint i) const { return m_hist[i]; }
|
||
|
|
uint& operator[] (uint i) { return m_hist[i]; }
|
||
|
|
|
||
|
|
uint64 get_total() const;
|
||
|
|
|
||
|
|
private:
|
||
|
|
crnlib::vector<uint> m_hist;
|
||
|
|
};
|
||
|
|
|
||
|
|
class adaptive_huffman_data_model
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
adaptive_huffman_data_model(bool encoding = true, uint total_syms = 0);
|
||
|
|
adaptive_huffman_data_model(const adaptive_huffman_data_model& other);
|
||
|
|
~adaptive_huffman_data_model();
|
||
|
|
|
||
|
|
adaptive_huffman_data_model& operator= (const adaptive_huffman_data_model& rhs);
|
||
|
|
|
||
|
|
void clear();
|
||
|
|
|
||
|
|
void init(bool encoding, uint total_syms);
|
||
|
|
void reset();
|
||
|
|
|
||
|
|
void rescale();
|
||
|
|
|
||
|
|
uint get_total_syms() const { return m_total_syms; }
|
||
|
|
uint get_cost(uint sym) const { return m_code_sizes[sym]; }
|
||
|
|
|
||
|
|
public:
|
||
|
|
uint m_total_syms;
|
||
|
|
|
||
|
|
uint m_update_cycle;
|
||
|
|
uint m_symbols_until_update;
|
||
|
|
|
||
|
|
uint m_total_count;
|
||
|
|
|
||
|
|
crnlib::vector<uint16> m_sym_freq;
|
||
|
|
|
||
|
|
crnlib::vector<uint16> m_codes;
|
||
|
|
crnlib::vector<uint8> m_code_sizes;
|
||
|
|
|
||
|
|
prefix_coding::decoder_tables* m_pDecode_tables;
|
||
|
|
|
||
|
|
uint8 m_decoder_table_bits;
|
||
|
|
bool m_encoding;
|
||
|
|
|
||
|
|
void update();
|
||
|
|
|
||
|
|
friend class symbol_codec;
|
||
|
|
};
|
||
|
|
|
||
|
|
class static_huffman_data_model
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
static_huffman_data_model();
|
||
|
|
static_huffman_data_model(const static_huffman_data_model& other);
|
||
|
|
~static_huffman_data_model();
|
||
|
|
|
||
|
|
static_huffman_data_model& operator= (const static_huffman_data_model& rhs);
|
||
|
|
|
||
|
|
void clear();
|
||
|
|
|
||
|
|
bool init(bool encoding, uint total_syms, const uint16* pSym_freq, uint code_size_limit);
|
||
|
|
bool init(bool encoding, uint total_syms, const uint* pSym_freq, uint code_size_limit);
|
||
|
|
bool init(bool encoding, uint total_syms, const uint8* pCode_sizes, uint code_size_limit);
|
||
|
|
bool init(bool encoding, const symbol_histogram& hist, uint code_size_limit);
|
||
|
|
|
||
|
|
uint get_total_syms() const { return m_total_syms; }
|
||
|
|
uint get_cost(uint sym) const { return m_code_sizes[sym]; }
|
||
|
|
|
||
|
|
const uint8* get_code_sizes() const { return m_code_sizes.empty() ? NULL : &m_code_sizes[0]; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
uint m_total_syms;
|
||
|
|
|
||
|
|
crnlib::vector<uint16> m_codes;
|
||
|
|
crnlib::vector<uint8> m_code_sizes;
|
||
|
|
|
||
|
|
prefix_coding::decoder_tables* m_pDecode_tables;
|
||
|
|
|
||
|
|
bool m_encoding;
|
||
|
|
|
||
|
|
bool prepare_decoder_tables();
|
||
|
|
uint compute_decoder_table_bits() const;
|
||
|
|
|
||
|
|
friend class symbol_codec;
|
||
|
|
};
|
||
|
|
|
||
|
|
class adaptive_bit_model
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
adaptive_bit_model();
|
||
|
|
adaptive_bit_model(float prob0);
|
||
|
|
adaptive_bit_model(const adaptive_bit_model& other);
|
||
|
|
|
||
|
|
adaptive_bit_model& operator= (const adaptive_bit_model& rhs);
|
||
|
|
|
||
|
|
void clear();
|
||
|
|
void set_probability_0(float prob0);
|
||
|
|
void update(uint bit);
|
||
|
|
|
||
|
|
float get_cost(uint bit) const;
|
||
|
|
|
||
|
|
public:
|
||
|
|
uint16 m_bit_0_prob;
|
||
|
|
|
||
|
|
friend class symbol_codec;
|
||
|
|
friend class adaptive_arith_data_model;
|
||
|
|
};
|
||
|
|
|
||
|
|
class adaptive_arith_data_model
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
adaptive_arith_data_model(bool encoding = true, uint total_syms = 0);
|
||
|
|
adaptive_arith_data_model(const adaptive_arith_data_model& other);
|
||
|
|
~adaptive_arith_data_model();
|
||
|
|
|
||
|
|
adaptive_arith_data_model& operator= (const adaptive_arith_data_model& rhs);
|
||
|
|
|
||
|
|
void clear();
|
||
|
|
|
||
|
|
void init(bool encoding, uint total_syms);
|
||
|
|
void reset();
|
||
|
|
|
||
|
|
uint get_total_syms() const { return m_total_syms; }
|
||
|
|
float get_cost(uint sym) const;
|
||
|
|
|
||
|
|
private:
|
||
|
|
uint m_total_syms;
|
||
|
|
typedef crnlib::vector<adaptive_bit_model> adaptive_bit_model_vector;
|
||
|
|
adaptive_bit_model_vector m_probs;
|
||
|
|
|
||
|
|
friend class symbol_codec;
|
||
|
|
};
|
||
|
|
|
||
|
|
#if (defined(_XBOX) || defined(_WIN64))
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_USE_64_BIT_BUFFER 1
|
||
|
|
#else
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_USE_64_BIT_BUFFER 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
class symbol_codec
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
symbol_codec();
|
||
|
|
|
||
|
|
void clear();
|
||
|
|
|
||
|
|
// Encoding
|
||
|
|
void start_encoding(uint expected_file_size);
|
||
|
|
uint encode_transmit_static_huffman_data_model(static_huffman_data_model& model, bool simulate, static_huffman_data_model* pDelta_model = NULL );
|
||
|
|
void encode_bits(uint bits, uint num_bits);
|
||
|
|
void encode_align_to_byte();
|
||
|
|
void encode(uint sym, adaptive_huffman_data_model& model);
|
||
|
|
void encode(uint sym, static_huffman_data_model& model);
|
||
|
|
void encode_truncated_binary(uint v, uint n);
|
||
|
|
static uint encode_truncated_binary_cost(uint v, uint n);
|
||
|
|
void encode_golomb(uint v, uint m);
|
||
|
|
void encode_rice(uint v, uint m);
|
||
|
|
static uint encode_rice_get_cost(uint v, uint m);
|
||
|
|
void encode(uint bit, adaptive_bit_model& model, bool update_model = true);
|
||
|
|
void encode(uint sym, adaptive_arith_data_model& model);
|
||
|
|
|
||
|
|
inline void encode_enable_simulation(bool enabled) { m_simulate_encoding = enabled; }
|
||
|
|
inline bool encode_get_simulation() { return m_simulate_encoding; }
|
||
|
|
inline uint encode_get_total_bits_written() const { return m_total_bits_written; }
|
||
|
|
|
||
|
|
void stop_encoding(bool support_arith);
|
||
|
|
|
||
|
|
const crnlib::vector<uint8>& get_encoding_buf() const { return m_output_buf; }
|
||
|
|
crnlib::vector<uint8>& get_encoding_buf() { return m_output_buf; }
|
||
|
|
|
||
|
|
// Decoding
|
||
|
|
|
||
|
|
typedef void (*need_bytes_func_ptr)(size_t num_bytes_consumed, void *pPrivate_data, const uint8* &pBuf, size_t &buf_size, bool &eof_flag);
|
||
|
|
|
||
|
|
bool start_decoding(const uint8* pBuf, size_t buf_size, bool eof_flag = true, need_bytes_func_ptr pNeed_bytes_func = NULL, void *pPrivate_data = NULL);
|
||
|
|
void decode_set_input_buffer(const uint8* pBuf, size_t buf_size, const uint8* pBuf_next, bool eof_flag = true);
|
||
|
|
inline uint64 decode_get_bytes_consumed() const { return m_pDecode_buf_next - m_pDecode_buf; }
|
||
|
|
inline uint64 decode_get_bits_remaining() const { return ((m_pDecode_buf_end - m_pDecode_buf_next) << 3) + m_bit_count; }
|
||
|
|
void start_arith_decoding();
|
||
|
|
bool decode_receive_static_huffman_data_model(static_huffman_data_model& model, static_huffman_data_model* pDeltaModel);
|
||
|
|
uint decode_bits(uint num_bits);
|
||
|
|
uint decode_peek_bits(uint num_bits);
|
||
|
|
void decode_remove_bits(uint num_bits);
|
||
|
|
void decode_align_to_byte();
|
||
|
|
int decode_remove_byte_from_bit_buf();
|
||
|
|
uint decode(adaptive_huffman_data_model& model);
|
||
|
|
uint decode(static_huffman_data_model& model);
|
||
|
|
uint decode_truncated_binary(uint n);
|
||
|
|
uint decode_golomb(uint m);
|
||
|
|
uint decode_rice(uint m);
|
||
|
|
uint decode(adaptive_bit_model& model, bool update_model = true);
|
||
|
|
uint decode(adaptive_arith_data_model& model);
|
||
|
|
uint64 stop_decoding();
|
||
|
|
|
||
|
|
uint get_total_model_updates() const { return m_total_model_updates; }
|
||
|
|
|
||
|
|
public:
|
||
|
|
const uint8* m_pDecode_buf;
|
||
|
|
const uint8* m_pDecode_buf_next;
|
||
|
|
const uint8* m_pDecode_buf_end;
|
||
|
|
size_t m_decode_buf_size;
|
||
|
|
bool m_decode_buf_eof;
|
||
|
|
|
||
|
|
need_bytes_func_ptr m_pDecode_need_bytes_func;
|
||
|
|
void* m_pDecode_private_data;
|
||
|
|
|
||
|
|
#if CRNLIB_SYMBOL_CODEC_USE_64_BIT_BUFFER
|
||
|
|
typedef uint64 bit_buf_t;
|
||
|
|
enum { cBitBufSize = 64 };
|
||
|
|
#else
|
||
|
|
typedef uint32 bit_buf_t;
|
||
|
|
enum { cBitBufSize = 32 };
|
||
|
|
#endif
|
||
|
|
|
||
|
|
bit_buf_t m_bit_buf;
|
||
|
|
int m_bit_count;
|
||
|
|
|
||
|
|
uint m_total_model_updates;
|
||
|
|
|
||
|
|
crnlib::vector<uint8> m_output_buf;
|
||
|
|
crnlib::vector<uint8> m_arith_output_buf;
|
||
|
|
|
||
|
|
struct output_symbol
|
||
|
|
{
|
||
|
|
uint m_bits;
|
||
|
|
|
||
|
|
enum { cArithSym = -1, cAlignToByteSym = -2 };
|
||
|
|
int16 m_num_bits;
|
||
|
|
|
||
|
|
uint16 m_arith_prob0;
|
||
|
|
};
|
||
|
|
crnlib::vector<output_symbol> m_output_syms;
|
||
|
|
|
||
|
|
uint m_total_bits_written;
|
||
|
|
bool m_simulate_encoding;
|
||
|
|
|
||
|
|
uint m_arith_base;
|
||
|
|
uint m_arith_value;
|
||
|
|
uint m_arith_length;
|
||
|
|
uint m_arith_total_bits;
|
||
|
|
|
||
|
|
bool m_support_arith;
|
||
|
|
|
||
|
|
void put_bits_init(uint expected_size);
|
||
|
|
void record_put_bits(uint bits, uint num_bits);
|
||
|
|
|
||
|
|
void arith_propagate_carry();
|
||
|
|
void arith_renorm_enc_interval();
|
||
|
|
void arith_start_encoding();
|
||
|
|
void arith_stop_encoding();
|
||
|
|
|
||
|
|
void put_bits(uint bits, uint num_bits);
|
||
|
|
void put_bits_align_to_byte();
|
||
|
|
void flush_bits();
|
||
|
|
void assemble_output_buf(bool support_arith);
|
||
|
|
|
||
|
|
void get_bits_init();
|
||
|
|
uint get_bits(uint num_bits);
|
||
|
|
void remove_bits(uint num_bits);
|
||
|
|
|
||
|
|
void decode_need_bytes();
|
||
|
|
|
||
|
|
enum
|
||
|
|
{
|
||
|
|
cNull,
|
||
|
|
cEncoding,
|
||
|
|
cDecoding
|
||
|
|
} m_mode;
|
||
|
|
};
|
||
|
|
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_USE_MACROS 1
|
||
|
|
|
||
|
|
#ifdef _XBOX
|
||
|
|
#define CRNLIB_READ_BIG_ENDIAN_UINT32(p) *reinterpret_cast<const uint32*>(p)
|
||
|
|
#elif defined(_MSC_VER)
|
||
|
|
#define CRNLIB_READ_BIG_ENDIAN_UINT32(p) _byteswap_ulong(*reinterpret_cast<const uint32*>(p))
|
||
|
|
#else
|
||
|
|
#define CRNLIB_READ_BIG_ENDIAN_UINT32(p) utils::swap32(*reinterpret_cast<const uint32*>(p))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if CRNLIB_SYMBOL_CODEC_USE_MACROS
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_DECLARE(codec) \
|
||
|
|
uint arith_value; \
|
||
|
|
uint arith_length; \
|
||
|
|
symbol_codec::bit_buf_t bit_buf; \
|
||
|
|
int bit_count; \
|
||
|
|
const uint8* pDecode_buf_next;
|
||
|
|
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_BEGIN(codec) \
|
||
|
|
arith_value = codec.m_arith_value; \
|
||
|
|
arith_length = codec.m_arith_length; \
|
||
|
|
bit_buf = codec.m_bit_buf; \
|
||
|
|
bit_count = codec.m_bit_count; \
|
||
|
|
pDecode_buf_next = codec.m_pDecode_buf_next;
|
||
|
|
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_END(codec) \
|
||
|
|
codec.m_arith_value = arith_value; \
|
||
|
|
codec.m_arith_length = arith_length; \
|
||
|
|
codec.m_bit_buf = bit_buf; \
|
||
|
|
codec.m_bit_count = bit_count; \
|
||
|
|
codec.m_pDecode_buf_next = pDecode_buf_next;
|
||
|
|
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_GET_BITS(codec, result, num_bits) \
|
||
|
|
{ \
|
||
|
|
while (bit_count < (int)(num_bits)) \
|
||
|
|
{ \
|
||
|
|
uint c = 0; \
|
||
|
|
if (pDecode_buf_next == codec.m_pDecode_buf_end) \
|
||
|
|
{ \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_END(codec) \
|
||
|
|
codec.decode_need_bytes(); \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_BEGIN(codec) \
|
||
|
|
if (pDecode_buf_next < codec.m_pDecode_buf_end) c = *pDecode_buf_next++; \
|
||
|
|
} \
|
||
|
|
else \
|
||
|
|
c = *pDecode_buf_next++; \
|
||
|
|
bit_count += 8; \
|
||
|
|
bit_buf |= (static_cast<symbol_codec::bit_buf_t>(c) << (symbol_codec::cBitBufSize - bit_count)); \
|
||
|
|
} \
|
||
|
|
result = num_bits ? static_cast<uint>(bit_buf >> (symbol_codec::cBitBufSize - (num_bits))) : 0; \
|
||
|
|
bit_buf <<= (num_bits); \
|
||
|
|
bit_count -= (num_bits); \
|
||
|
|
}
|
||
|
|
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_ARITH_BIT(codec, result, model) \
|
||
|
|
{ \
|
||
|
|
if (arith_length < cSymbolCodecArithMinLen) \
|
||
|
|
{ \
|
||
|
|
uint c; \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_GET_BITS(codec, c, 8); \
|
||
|
|
arith_value = (arith_value << 8) | c; \
|
||
|
|
arith_length <<= 8; \
|
||
|
|
} \
|
||
|
|
uint x = model.m_bit_0_prob * (arith_length >> cSymbolCodecArithProbBits); \
|
||
|
|
result = (arith_value >= x); \
|
||
|
|
if (!result) \
|
||
|
|
{ \
|
||
|
|
model.m_bit_0_prob += ((cSymbolCodecArithProbScale - model.m_bit_0_prob) >> cSymbolCodecArithProbMoveBits); \
|
||
|
|
arith_length = x; \
|
||
|
|
} \
|
||
|
|
else \
|
||
|
|
{ \
|
||
|
|
model.m_bit_0_prob -= (model.m_bit_0_prob >> cSymbolCodecArithProbMoveBits); \
|
||
|
|
arith_value -= x; \
|
||
|
|
arith_length -= x; \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
|
||
|
|
#if CRNLIB_SYMBOL_CODEC_USE_64_BIT_BUFFER
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_ADAPTIVE_HUFFMAN(codec, result, model) \
|
||
|
|
{ \
|
||
|
|
const prefix_coding::decoder_tables* pTables = model.m_pDecode_tables; \
|
||
|
|
if (bit_count < 24) \
|
||
|
|
{ \
|
||
|
|
uint c = 0; \
|
||
|
|
pDecode_buf_next += sizeof(uint32); \
|
||
|
|
if (pDecode_buf_next >= codec.m_pDecode_buf_end) \
|
||
|
|
{ \
|
||
|
|
pDecode_buf_next -= sizeof(uint32); \
|
||
|
|
while (bit_count < 24) \
|
||
|
|
{ \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_END(codec) \
|
||
|
|
codec.decode_need_bytes(); \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_BEGIN(codec) \
|
||
|
|
if (pDecode_buf_next < codec.m_pDecode_buf_end) c = *pDecode_buf_next++; \
|
||
|
|
bit_count += 8; \
|
||
|
|
bit_buf |= (static_cast<symbol_codec::bit_buf_t>(c) << (symbol_codec::cBitBufSize - bit_count)); \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
else \
|
||
|
|
{ \
|
||
|
|
c = CRNLIB_READ_BIG_ENDIAN_UINT32(pDecode_buf_next - sizeof(uint32)); \
|
||
|
|
bit_count += 32; \
|
||
|
|
bit_buf |= (static_cast<symbol_codec::bit_buf_t>(c) << (symbol_codec::cBitBufSize - bit_count)); \
|
||
|
|
} \
|
||
|
|
} \
|
||
|
|
uint k = static_cast<uint>((bit_buf >> (symbol_codec::cBitBufSize - 16)) + 1); \
|
||
|
|
uint len; \
|
||
|
|
if (k <= pTables->m_table_max_code) \
|
||
|
|
{ \
|
||
|
|
uint32 t = pTables->m_lookup[bit_buf >> (symbol_codec::cBitBufSize - pTables->m_table_bits)]; \
|
||
|
|
result = t & UINT16_MAX; \
|
||
|
|
len = t >> 16; \
|
||
|
|
} \
|
||
|
|
else \
|
||
|
|
{ \
|
||
|
|
len = pTables->m_decode_start_code_size; \
|
||
|
|
for ( ; ; ) \
|
||
|
|
{ \
|
||
|
|
if (k <= pTables->m_max_codes[len - 1]) \
|
||
|
|
break; \
|
||
|
|
len++; \
|
||
|
|
} \
|
||
|
|
int val_ptr = pTables->m_val_ptrs[len - 1] + static_cast<int>(bit_buf >> (symbol_codec::cBitBufSize - len)); \
|
||
|
|
if (((uint)val_ptr >= model.m_total_syms)) val_ptr = 0; \
|
||
|
|
result = pTables->m_sorted_symbol_order[val_ptr]; \
|
||
|
|
} \
|
||
|
|
bit_buf <<= len; \
|
||
|
|
bit_count -= len; \
|
||
|
|
uint freq = model.m_sym_freq[result]; \
|
||
|
|
freq++; \
|
||
|
|
model.m_sym_freq[result] = static_cast<uint16>(freq); \
|
||
|
|
if (freq == UINT16_MAX) model.rescale(); \
|
||
|
|
if (--model.m_symbols_until_update == 0) \
|
||
|
|
{ \
|
||
|
|
model.update(); \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_ADAPTIVE_HUFFMAN(codec, result, model) \
|
||
|
|
{ \
|
||
|
|
const prefix_coding::decoder_tables* pTables = model.m_pDecode_tables; \
|
||
|
|
while (bit_count < (symbol_codec::cBitBufSize - 8)) \
|
||
|
|
{ \
|
||
|
|
uint c = 0; \
|
||
|
|
if (pDecode_buf_next == codec.m_pDecode_buf_end) \
|
||
|
|
{ \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_END(codec) \
|
||
|
|
codec.decode_need_bytes(); \
|
||
|
|
CRNLIB_SYMBOL_CODEC_DECODE_BEGIN(codec) \
|
||
|
|
if (pDecode_buf_next < codec.m_pDecode_buf_end) c = *pDecode_buf_next++; \
|
||
|
|
} \
|
||
|
|
else \
|
||
|
|
c = *pDecode_buf_next++; \
|
||
|
|
bit_count += 8; \
|
||
|
|
bit_buf |= (static_cast<symbol_codec::bit_buf_t>(c) << (symbol_codec::cBitBufSize - bit_count)); \
|
||
|
|
} \
|
||
|
|
uint k = static_cast<uint>((bit_buf >> (symbol_codec::cBitBufSize - 16)) + 1); \
|
||
|
|
uint len; \
|
||
|
|
if (k <= pTables->m_table_max_code) \
|
||
|
|
{ \
|
||
|
|
uint32 t = pTables->m_lookup[bit_buf >> (symbol_codec::cBitBufSize - pTables->m_table_bits)]; \
|
||
|
|
result = t & UINT16_MAX; \
|
||
|
|
len = t >> 16; \
|
||
|
|
} \
|
||
|
|
else \
|
||
|
|
{ \
|
||
|
|
len = pTables->m_decode_start_code_size; \
|
||
|
|
for ( ; ; ) \
|
||
|
|
{ \
|
||
|
|
if (k <= pTables->m_max_codes[len - 1]) \
|
||
|
|
break; \
|
||
|
|
len++; \
|
||
|
|
} \
|
||
|
|
int val_ptr = pTables->m_val_ptrs[len - 1] + static_cast<int>(bit_buf >> (symbol_codec::cBitBufSize - len)); \
|
||
|
|
if (((uint)val_ptr >= model.m_total_syms)) val_ptr = 0; \
|
||
|
|
result = pTables->m_sorted_symbol_order[val_ptr]; \
|
||
|
|
} \
|
||
|
|
bit_buf <<= len; \
|
||
|
|
bit_count -= len; \
|
||
|
|
uint freq = model.m_sym_freq[result]; \
|
||
|
|
freq++; \
|
||
|
|
model.m_sym_freq[result] = static_cast<uint16>(freq); \
|
||
|
|
if (freq == UINT16_MAX) model.rescale(); \
|
||
|
|
if (--model.m_symbols_until_update == 0) \
|
||
|
|
{ \
|
||
|
|
model.update(); \
|
||
|
|
} \
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#else
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_DECLARE(codec)
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_BEGIN(codec)
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_END(codec)
|
||
|
|
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_GET_BITS(codec, result, num_bits) result = codec.decode_bits(num_bits);
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_ARITH_BIT(codec, result, model) result = codec.decode(model);
|
||
|
|
#define CRNLIB_SYMBOL_CODEC_DECODE_ADAPTIVE_HUFFMAN(codec, result, model) result = codec.decode(model);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
} // namespace crnlib
|
||
|
|
|