127 lines
5.0 KiB
C
127 lines
5.0 KiB
C
/*****************************************************************************
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* cabac.h: arithmetic coder
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*****************************************************************************
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* Copyright (C) 2003-2025 x264 project
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*
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* Authors: Loren Merritt <lorenm@u.washington.edu>
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* Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at licensing@x264.com.
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*****************************************************************************/
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#ifndef X264_CABAC_H
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#define X264_CABAC_H
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typedef struct
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{
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/* state */
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int i_low;
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int i_range;
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/* bit stream */
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int i_queue; //stored with an offset of -8 for faster asm
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int i_bytes_outstanding;
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uint8_t *p_start;
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uint8_t *p;
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uint8_t *p_end;
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/* aligned for memcpy_aligned starting here */
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ALIGNED_64( int f8_bits_encoded ); // only if using x264_cabac_size_decision()
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/* context */
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uint8_t state[1024];
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/* for 16-byte alignment */
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uint8_t padding[12];
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} x264_cabac_t;
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/* init the contexts given i_slice_type, the quantif and the model */
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#define x264_cabac_context_init x264_template(cabac_context_init)
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void x264_cabac_context_init( x264_t *h, x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model );
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#define x264_cabac_encode_init_core x264_template(cabac_encode_init_core)
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void x264_cabac_encode_init_core( x264_cabac_t *cb );
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#define x264_cabac_encode_init x264_template(cabac_encode_init)
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void x264_cabac_encode_init( x264_cabac_t *cb, uint8_t *p_data, uint8_t *p_end );
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#define x264_cabac_encode_decision_c x264_template(cabac_encode_decision_c)
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void x264_cabac_encode_decision_c( x264_cabac_t *cb, int i_ctx, int b );
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#define x264_cabac_encode_decision_asm x264_template(cabac_encode_decision_asm)
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void x264_cabac_encode_decision_asm( x264_cabac_t *cb, int i_ctx, int b );
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#define x264_cabac_encode_bypass_c x264_template(cabac_encode_bypass_c)
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void x264_cabac_encode_bypass_c( x264_cabac_t *cb, int b );
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#define x264_cabac_encode_bypass_asm x264_template(cabac_encode_bypass_asm)
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void x264_cabac_encode_bypass_asm( x264_cabac_t *cb, int b );
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#define x264_cabac_encode_terminal_c x264_template(cabac_encode_terminal_c)
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void x264_cabac_encode_terminal_c( x264_cabac_t *cb );
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#define x264_cabac_encode_terminal_asm x264_template(cabac_encode_terminal_asm)
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void x264_cabac_encode_terminal_asm( x264_cabac_t *cb );
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#define x264_cabac_encode_ue_bypass x264_template(cabac_encode_ue_bypass)
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void x264_cabac_encode_ue_bypass( x264_cabac_t *cb, int exp_bits, int val );
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#define x264_cabac_encode_flush x264_template(cabac_encode_flush)
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void x264_cabac_encode_flush( x264_t *h, x264_cabac_t *cb );
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#if HAVE_MMX
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#define x264_cabac_encode_decision x264_cabac_encode_decision_asm
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#define x264_cabac_encode_bypass x264_cabac_encode_bypass_asm
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#define x264_cabac_encode_terminal x264_cabac_encode_terminal_asm
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#elif HAVE_AARCH64
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#define x264_cabac_encode_decision x264_cabac_encode_decision_asm
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#define x264_cabac_encode_bypass x264_cabac_encode_bypass_asm
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#define x264_cabac_encode_terminal x264_cabac_encode_terminal_asm
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#else
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#define x264_cabac_encode_decision x264_cabac_encode_decision_c
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#define x264_cabac_encode_bypass x264_cabac_encode_bypass_c
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#define x264_cabac_encode_terminal x264_cabac_encode_terminal_c
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#endif
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#define x264_cabac_encode_decision_noup x264_cabac_encode_decision
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static ALWAYS_INLINE int x264_cabac_pos( x264_cabac_t *cb )
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{
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return (cb->p - cb->p_start + cb->i_bytes_outstanding) * 8 + cb->i_queue;
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}
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/* internal only. these don't write the bitstream, just calculate bit cost: */
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static ALWAYS_INLINE void x264_cabac_size_decision( x264_cabac_t *cb, long i_ctx, long b )
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{
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int i_state = cb->state[i_ctx];
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cb->state[i_ctx] = x264_cabac_transition[i_state][b];
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cb->f8_bits_encoded += x264_cabac_entropy[i_state^b];
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}
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static ALWAYS_INLINE int x264_cabac_size_decision2( uint8_t *state, long b )
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{
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int i_state = *state;
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*state = x264_cabac_transition[i_state][b];
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return x264_cabac_entropy[i_state^b];
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}
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static ALWAYS_INLINE void x264_cabac_size_decision_noup( x264_cabac_t *cb, long i_ctx, long b )
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{
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int i_state = cb->state[i_ctx];
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cb->f8_bits_encoded += x264_cabac_entropy[i_state^b];
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}
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static ALWAYS_INLINE int x264_cabac_size_decision_noup2( uint8_t *state, long b )
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{
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return x264_cabac_entropy[*state^b];
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}
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#endif
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