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cdf_.h
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cdf_.h
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/**
Copyright (C) powturbo 2013-2023
SPDX-License-Identifier: GPL v3 License
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- homepage : https://sites.google.com/site/powturbo/
- github : https://github.com/powturbo
- twitter : https://twitter.com/powturbo
- email : powturbo [_AT_] gmail [_DOT_] com
**/
// CDF : Cumulative distribution function for range coder + rans
#define CDFRATE 7
#define CDFDEC0(_mb_, _n_) cdf_t _mb_[_n_+1]; { int _j; for(_j = 0; _j <= _n_; _j++) _mb_[_j] = _j << (RC_BITS-4); }
#define CDFDEC1(_mb_,_n1_, _n0_) cdf_t _mb_[_n1_][_n0_+1]; { int _i,_j; for(_i=0; _i < _n1_; _i++) for(_j = 0; _j <= _n0_; _j++) _mb_[_i][_j] = _j << (RC_BITS-4); }
#define CDFDEC2(_mb_, _n2_, _n1_,_n0_) cdf_t _mb_[_n2_][_n1_][_n0_+1]; { int _i,_j,_k;\
for( _i = 0; _i < _n2_; _i++) \
for( _j = 0; _j < _n1_; _j++)\
for(_k = 0; _k <= _n0_; _k++) _mb_[_i][_j][_k] = _k << (RC_BITS-4);\
}
#ifndef _CDF2
#define IC 10
#define MIXD ( ((1u<<RC_BITS)-1) & ~((1<<5)-1) )
#define STATEUPD(_mb_, _st_, _x_) (state_t)((_mb_)[_x_] - (_mb_)[--_x_]) * (_st_ >> ANS_BITS) + BZHI32(_st_, ANS_BITS) - (_mb_)[_x_]
//#define mbcheck(_mb_) for(int i=0; i < 16; i++) AC(_mb_[i+1] > _mb_[i], "Fatal probs")
//---- CDF16 -----------------------------------------------------------------
#define CDF16DEC0(_mb_) CDFDEC0(_mb_, 16)
#define CDF16DEC1(_mb_,_n_) CDFDEC1(_mb_, _n_, 16)
#define CDF16DEC2(_mb_,_n1_,_n0_) CDFDEC2(_mb_, _n1_,_n0_, 16)
#ifdef __AVX2__
#define CDF16DEF __m256i _cmv = _mm256_set1_epi16(MIXD), _crv = _mm256_set_epi16(15*IC,14*IC,13*IC,12*IC,11*IC,10*IC, 9*IC, 8*IC, 7*IC, 6*IC, 5*IC, 4*IC, 3*IC, 2*IC, 1*IC, 0)
#define cdf16upd(_mb_, _x_) {\
__m256i _mv = _mm256_loadu_si256((const __m256i *)(_mb_));\
_mv = _mm256_add_epi16(_mv,_mm256_srai_epi16(_mm256_add_epi16(_mm256_sub_epi16(_crv,_mv),_mm256_and_si256(_mm256_cmpgt_epi16(_mv, _mm256_set1_epi16((_mb_)[_x_])),_cmv)), CDFRATE));\
_mm256_storeu_si256((__m256i *)(_mb_), _mv);\
}
#define cdf16ansdec(_mb_, _st_, _x_) {\
__m256i _mv = _mm256_loadu_si256((const __m256i *)(_mb_)),\
_gv = _mm256_cmpgt_epi16(_mv, _mm256_set1_epi16(BZHI32(_st_, ANS_BITS)));\
_x_ = ctz32(_mm256_movemask_epi8(_gv))>>1;\
_st_ = STATEUPD((_mb_), _st_,_x_);\
_mv = _mm256_add_epi16(_mv,_mm256_srai_epi16(_mm256_add_epi16(_mm256_sub_epi16(_crv,_mv),_mm256_and_si256(_gv,_cmv)), CDFRATE));\
_mm256_storeu_si256((__m256i *)(_mb_), _mv);\
}
#define cdf16sansdec(_mb_, _st_, _x_) {\
__m256i _mv = _mm256_loadu_si256((const __m256i *)(_mb_)), \
_gv = _mm256_cmpgt_epi16(_mv, _mm256_set1_epi16(BZHI32(_st_, ANS_BITS))); \
_x_ = (ctz32(_mm256_movemask_epi8(_gv))>>1); \
_st_ = STATEUPD((_mb_), _st_,_x_);\
}
#elif defined(__SSE2__) || defined(__powerpc64__) || defined(__ARM_NEON)
#define CDF16DEF __m128i _cmv = _mm_set1_epi16(MIXD), /*adaptive CDF*/\
_crv0 = _mm_set_epi16( 7*IC, 6*IC, 5*IC, 4*IC, 3*IC, 2*IC, 1*IC, 0 ), \
_crv1 = _mm_set_epi16(15*IC, 14*IC, 13*IC, 12*IC, 11*IC, 10*IC, 9*IC, 8*IC)
#define cdf16ansdec(_mb_, _st_, _x_) {\
__m128i _mv0 = _mm_loadu_si128((const __m128i *)(_mb_)),\
_mv1 = _mm_loadu_si128((const __m128i *)&(_mb_)[8]),\
_sv = _mm_set1_epi16(BZHI32(_st_, ANS_BITS)),\
_gv0 = _mm_cmpgt_epi16(_mv0, _sv),\
_gv1 = _mm_cmpgt_epi16(_mv1, _sv);\
_x_ = ctz16(_mm_movemask_epi8(_mm_packs_epi16(_gv0, _gv1))); \
_st_ = STATEUPD(_mb_,_st_,_x_);\
_mv0 = _mm_add_epi16(_mv0,_mm_srai_epi16(_mm_add_epi16(_mm_sub_epi16(_crv0,_mv0),_mm_and_si128(_gv0,_cmv)), CDFRATE));\
_mv1 = _mm_add_epi16(_mv1,_mm_srai_epi16(_mm_add_epi16(_mm_sub_epi16(_crv1,_mv1),_mm_and_si128(_gv1,_cmv)), CDFRATE));\
_mm_storeu_si128((const __m128i *)(_mb_), _mv0);\
_mm_storeu_si128((const __m128i *)&(_mb_)[8], _mv1);\
}
#define cdf16upd(_mb_, _x_) {\
__m128i _mv0 = _mm_loadu_si128((const __m128i *)(_mb_)),\
_mv1 = _mm_loadu_si128((const __m128i *)&(_mb_)[8]),\
_sv = _mm_set1_epi16((_mb_)[_x_]),\
_gv0 = _mm_cmpgt_epi16(_mv0, _sv),\
_gv1 = _mm_cmpgt_epi16(_mv1, _sv);\
_mv0 = _mm_add_epi16(_mv0,_mm_srai_epi16(_mm_add_epi16(_mm_sub_epi16(_crv0,_mv0),_mm_and_si128(_gv0,_cmv)), CDFRATE));\
_mv1 = _mm_add_epi16(_mv1,_mm_srai_epi16(_mm_add_epi16(_mm_sub_epi16(_crv1,_mv1),_mm_and_si128(_gv1,_cmv)), CDFRATE));\
_mm_storeu_si128((const __m128i *)(_mb_), _mv0);\
_mm_storeu_si128((const __m128i *)&(_mb_)[8], _mv1);\
}
#define cdf16sansdec(_mb_, _st_, _x_) { /*static CDF*/\
__m128i _mv0 = _mm_loadu_si128((const __m128i *)(_mb_)),\
_mv1 = _mm_loadu_si128((const __m128i *)&(_mb_)[8]),\
_sv = _mm_set1_epi16(BZHI32(_st_, ANS_BITS)),\
_gv0 = _mm_cmpgt_epi16(_mv0, _sv),\
_gv1 = _mm_cmpgt_epi16(_mv1, _sv);\
_x_ = ctz16(_mm_movemask_epi8(_mm_packs_epi16(_gv0, _gv1))); \
_st_ = STATEUPD(_mb_,_st_,_x_);\
}
#elif defined(__ARM_NEON) // TODO: custom arm functions
#else
#define CDF16DEF
#define cdf16upd(_mb_,_x_) { unsigned _i;\
for(_i = 0; _i < 16; _i++) {\
int _tmp = 2 - (1<<CDFRATE) + _i*IC + (32767 + (1<<CDFRATE) - 16)*(_i > _x_);\
(_mb_)[_i] -= ((_mb_)[_i] - _tmp) >> CDFRATE;\
}\
}
#define cdf16ansdec(_mb_, _st_, _x_) { _x_=0; while(BZHI32(_st_, ANS_BITS) >= (_mb_)[_x_]) ++_x_;\
unsigned _s = (_mb_)[_x_--],_t=(_mb_)[_x_]; _st_ = (state_t)(_s - _t) * (_st_ >> ANS_BITS) + BZHI32(_st_, ANS_BITS) - _t; cdf16upd((_mb_),_x_);\
}
#define cdf16sansdec(_mb_, _st_, _x_) { _x_=0; while(BZHI32(_st_, ANS_BITS) >= (_mb_)[_x_]) ++_x_; /*static CDF*/\
unsigned _s = (_mb_)[_x_--],_t=(_mb_)[_x_]; _st_ = (state_t)(_s - _t) * (_st_ >> ANS_BITS) + BZHI32(_st_, ANS_BITS) - _t;\
}
#endif
//----- CDF8 --------------------------------------------------------------------------------------------------
#define CDF8DEC0(_mb_) CDFDEC0(_mb_, 8)
#define CDF8DEC1(_mb_,_n_) CDFDEC1(_mb_, _n_, 8)
#if defined(__SSE2__) || defined(__powerpc64__) || defined(__ARM_NEON)
#define CDF8DEF __m128i _cmv = _mm_set1_epi16(MIXD),\
_crv0 = _mm_set_epi16( 7*IC, 6*IC, 5*IC, 4*IC, 3*IC, 2*IC, 1*IC, 0)
#define cdf8ansdec(_mb_, _st_, _x_) {\
__m128i _mv0 = _mm_loadu_si128((const __m128i *)_mb_),\
_sv = _mm_set1_epi16(BZHI32(_st_, ANS_BITS)),\
_gv0 = _mm_cmpgt_epi16(_mv0, _sv),\
_x_ = ctz16(_mm_movemask_epi8(_gv0))); \
_st_ = STATEUPD(_mb_,_st_,_x_);\
_mv0 = _mm_add_epi16(_mv0,_mm_srai_epi16(_mm_add_epi16(_mm_sub_epi16(_crv0,_mv0),_mm_and_si128(_gv0,_cmv)), CDFRATE));\
_mm_storeu_si128((const __m128i *)(_mb_), _mv0);\
}
#define cdf8upd(_mb_, _x_) {\
__m128i _mv0 = _mm_loadu_si128((const __m128i *)_mb_),\
_sv = _mm_set1_epi16(_mb_[_x_]),\
_gv0 = _mm_cmpgt_epi16(_mv0, _sv),\
_mv0 = _mm_add_epi16(_mv0,_mm_srai_epi16(_mm_add_epi16(_mm_sub_epi16(_crv0,_mv0),_mm_and_si128(_gv0,_cmv)), CDFRATE));\
_mm_storeu_si128((const __m128i *)(_mb_), _mv0);\
}
#else
#define CDF16DEF
#define cdf8upd(_mb_,_x_) { unsigned _i; \
for(_i = 0; _i < 8; _i++) { \
int _tmp = 2 - (1<<CDFRATE) + _i*IC + (32767 + (1<<CDFRATE) - 16)*(_i > _x_);\
_mb_[_i] -= (_mb_[_i] - _tmp) >> CDFRATE; \
}\
}
#define cdf8ansdec(_mb_, _st_, _x_) { _x_=0; while(BZHI32(_st_, ANS_BITS) >= _mb_[_x_]) ++_x_;\
unsigned _s = _mb_[_x_--],_t=_mb_[_x_]; _st_ = (state_t)(_s - _t) * (_st_ >> ANS_BITS) + BZHI32(_st_, ANS_BITS) - _t; cdf8upd(_mb_,_x_);\
}
#endif
#else //----------------------------------------------------------------------------
#include "xcdf_.h"
#endif