cabac.h
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/*****************************************************************************
* cabac.h: arithmetic coder
*****************************************************************************
* Copyright (C) 2003-2024 x264 project
*
* Authors: Loren Merritt <lorenm@u.washington.edu>
* Laurent Aimar <fenrir@via.ecp.fr>
*
* 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 2 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 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#ifndef X264_CABAC_H
#define X264_CABAC_H
typedef struct
{
/* state */
int i_low;
int i_range;
/* bit stream */
int i_queue; //stored with an offset of -8 for faster asm
int i_bytes_outstanding;
uint8_t *p_start;
uint8_t *p;
uint8_t *p_end;
/* aligned for memcpy_aligned starting here */
ALIGNED_64( int f8_bits_encoded ); // only if using x264_cabac_size_decision()
/* context */
uint8_t state[1024];
/* for 16-byte alignment */
uint8_t padding[12];
} x264_cabac_t;
/* init the contexts given i_slice_type, the quantif and the model */
#define x264_cabac_context_init x264_template(cabac_context_init)
void x264_cabac_context_init( x264_t *h, x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model );
#define x264_cabac_encode_init_core x264_template(cabac_encode_init_core)
void x264_cabac_encode_init_core( x264_cabac_t *cb );
#define x264_cabac_encode_init x264_template(cabac_encode_init)
void x264_cabac_encode_init( x264_cabac_t *cb, uint8_t *p_data, uint8_t *p_end );
#define x264_cabac_encode_decision_c x264_template(cabac_encode_decision_c)
void x264_cabac_encode_decision_c( x264_cabac_t *cb, int i_ctx, int b );
#define x264_cabac_encode_decision_asm x264_template(cabac_encode_decision_asm)
void x264_cabac_encode_decision_asm( x264_cabac_t *cb, int i_ctx, int b );
#define x264_cabac_encode_bypass_c x264_template(cabac_encode_bypass_c)
void x264_cabac_encode_bypass_c( x264_cabac_t *cb, int b );
#define x264_cabac_encode_bypass_asm x264_template(cabac_encode_bypass_asm)
void x264_cabac_encode_bypass_asm( x264_cabac_t *cb, int b );
#define x264_cabac_encode_terminal_c x264_template(cabac_encode_terminal_c)
void x264_cabac_encode_terminal_c( x264_cabac_t *cb );
#define x264_cabac_encode_terminal_asm x264_template(cabac_encode_terminal_asm)
void x264_cabac_encode_terminal_asm( x264_cabac_t *cb );
#define x264_cabac_encode_ue_bypass x264_template(cabac_encode_ue_bypass)
void x264_cabac_encode_ue_bypass( x264_cabac_t *cb, int exp_bits, int val );
#define x264_cabac_encode_flush x264_template(cabac_encode_flush)
void x264_cabac_encode_flush( x264_t *h, x264_cabac_t *cb );
#if HAVE_MMX
#define x264_cabac_encode_decision x264_cabac_encode_decision_asm
#define x264_cabac_encode_bypass x264_cabac_encode_bypass_asm
#define x264_cabac_encode_terminal x264_cabac_encode_terminal_asm
#elif HAVE_AARCH64
#define x264_cabac_encode_decision x264_cabac_encode_decision_asm
#define x264_cabac_encode_bypass x264_cabac_encode_bypass_asm
#define x264_cabac_encode_terminal x264_cabac_encode_terminal_asm
#else
#define x264_cabac_encode_decision x264_cabac_encode_decision_c
#define x264_cabac_encode_bypass x264_cabac_encode_bypass_c
#define x264_cabac_encode_terminal x264_cabac_encode_terminal_c
#endif
#define x264_cabac_encode_decision_noup x264_cabac_encode_decision
static ALWAYS_INLINE int x264_cabac_pos( x264_cabac_t *cb )
{
return (cb->p - cb->p_start + cb->i_bytes_outstanding) * 8 + cb->i_queue;
}
/* internal only. these don't write the bitstream, just calculate bit cost: */
static ALWAYS_INLINE void x264_cabac_size_decision( x264_cabac_t *cb, long i_ctx, long b )
{
int i_state = cb->state[i_ctx];
cb->state[i_ctx] = x264_cabac_transition[i_state][b];
cb->f8_bits_encoded += x264_cabac_entropy[i_state^b];
}
static ALWAYS_INLINE int x264_cabac_size_decision2( uint8_t *state, long b )
{
int i_state = *state;
*state = x264_cabac_transition[i_state][b];
return x264_cabac_entropy[i_state^b];
}
static ALWAYS_INLINE void x264_cabac_size_decision_noup( x264_cabac_t *cb, long i_ctx, long b )
{
int i_state = cb->state[i_ctx];
cb->f8_bits_encoded += x264_cabac_entropy[i_state^b];
}
static ALWAYS_INLINE int x264_cabac_size_decision_noup2( uint8_t *state, long b )
{
return x264_cabac_entropy[*state^b];
}
#endif