cabac.h
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上传日期:2021-12-09
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文件大小:3k
源码类别:
Audio
开发平台:
Visual C++
- /*****************************************************************************
- * cabac.h: h264 encoder library
- *****************************************************************************
- * Copyright (C) 2003 Laurent Aimar
- * $Id: cabac.h,v 1.1 2004/06/03 19:27:06 fenrir Exp $
- *
- * Authors: 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- #ifndef _CABAC_H
- #define _CABAC_H 1
- typedef struct
- {
- /* context */
- /* #436-459 are for interlacing, so are omitted for now */
- uint8_t state[436];
- /* state */
- int i_low;
- int i_range;
- /* bit stream */
- int i_bits_outstanding;
- int f8_bits_encoded; // only if using x264_cabac_size_decision()
- bs_t *s;
- } x264_cabac_t;
- /* encoder/decoder: init the contexts given i_slice_type, the quantif and the model */
- void x264_cabac_context_init( x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model );
- /* decoder only: */
- void x264_cabac_decode_init ( x264_cabac_t *cb, bs_t *s );
- int x264_cabac_decode_decision( x264_cabac_t *cb, int i_ctx_idx );
- int x264_cabac_decode_bypass ( x264_cabac_t *cb );
- int x264_cabac_decode_terminal( x264_cabac_t *cb );
- /* encoder only: */
- void x264_cabac_encode_init ( x264_cabac_t *cb, bs_t *s );
- void x264_cabac_encode_decision( x264_cabac_t *cb, int i_ctx_idx, int b );
- void x264_cabac_encode_bypass( x264_cabac_t *cb, int b );
- void x264_cabac_encode_terminal( x264_cabac_t *cb, int b );
- void x264_cabac_encode_flush( x264_cabac_t *cb );
- /* don't write the bitstream, just calculate cost: */
- void x264_cabac_size_decision( x264_cabac_t *cb, int i_ctx, int b );
- int x264_cabac_size_decision2( uint8_t *state, int b );
- int x264_cabac_size_decision_noup( uint8_t *state, int b );
- static inline int x264_cabac_pos( x264_cabac_t *cb )
- {
- return bs_pos( cb->s ) + cb->i_bits_outstanding;
- }
- #endif