1 /*****************************************************************************
2 * cabac.h: h264 encoder library
3 *****************************************************************************
4 * Copyright (C) 2003-2008 x264 project
6 * Authors: Loren Merritt <lorenm@u.washington.edu>
7 * Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
22 *****************************************************************************/
34 int i_queue; //stored with an offset of -8 for faster asm
35 int i_bytes_outstanding;
41 /* aligned for memcpy_aligned starting here */
42 ALIGNED_16( int f8_bits_encoded ); // only if using x264_cabac_size_decision()
48 extern const uint8_t x264_cabac_transition[128][2];
49 extern const uint16_t x264_cabac_entropy[128];
51 /* init the contexts given i_slice_type, the quantif and the model */
52 void x264_cabac_context_init( x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model );
54 void x264_cabac_encode_init_core( x264_cabac_t *cb );
55 void x264_cabac_encode_init ( x264_cabac_t *cb, uint8_t *p_data, uint8_t *p_end );
56 void x264_cabac_encode_decision_c( x264_cabac_t *cb, int i_ctx, int b );
57 void x264_cabac_encode_decision_asm( x264_cabac_t *cb, int i_ctx, int b );
58 void x264_cabac_encode_bypass_c( x264_cabac_t *cb, int b );
59 void x264_cabac_encode_bypass_asm( x264_cabac_t *cb, int b );
60 void x264_cabac_encode_terminal_c( x264_cabac_t *cb );
61 void x264_cabac_encode_terminal_asm( x264_cabac_t *cb );
62 void x264_cabac_encode_ue_bypass( x264_cabac_t *cb, int exp_bits, int val );
63 void x264_cabac_encode_flush( x264_t *h, x264_cabac_t *cb );
66 #define x264_cabac_encode_decision x264_cabac_encode_decision_asm
67 #define x264_cabac_encode_bypass x264_cabac_encode_bypass_asm
68 #define x264_cabac_encode_terminal x264_cabac_encode_terminal_asm
70 #define x264_cabac_encode_decision x264_cabac_encode_decision_c
71 #define x264_cabac_encode_bypass x264_cabac_encode_bypass_c
72 #define x264_cabac_encode_terminal x264_cabac_encode_terminal_c
74 #define x264_cabac_encode_decision_noup x264_cabac_encode_decision
76 static ALWAYS_INLINE int x264_cabac_pos( x264_cabac_t *cb )
78 return (cb->p - cb->p_start + cb->i_bytes_outstanding) * 8 + cb->i_queue;
81 /* internal only. these don't write the bitstream, just calculate bit cost: */
83 static ALWAYS_INLINE void x264_cabac_size_decision( x264_cabac_t *cb, long i_ctx, long b )
85 int i_state = cb->state[i_ctx];
86 cb->state[i_ctx] = x264_cabac_transition[i_state][b];
87 cb->f8_bits_encoded += x264_cabac_entropy[i_state^b];
90 static ALWAYS_INLINE int x264_cabac_size_decision2( uint8_t *state, long b )
93 *state = x264_cabac_transition[i_state][b];
94 return x264_cabac_entropy[i_state^b];
97 static ALWAYS_INLINE void x264_cabac_size_decision_noup( x264_cabac_t *cb, long i_ctx, long b )
99 int i_state = cb->state[i_ctx];
100 cb->f8_bits_encoded += x264_cabac_entropy[i_state^b];
103 static ALWAYS_INLINE int x264_cabac_size_decision_noup2( uint8_t *state, long b )
105 return x264_cabac_entropy[*state^b];