68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/*****************************************************************************
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* cabac.h: h264 encoder library
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*****************************************************************************
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* Copyright (C) 2003 Laurent Aimar
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* $Id: cabac.h,v 1.1 2004/06/03 19:27:06 fenrir Exp $
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is CC_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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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#ifndef _CABAC_H
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#define _CABAC_H 1
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typedef struct
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{
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/* context */
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uint8_t state[460];
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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_bits_outstanding;
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int f8_bits_encoded; // only if using x264_cabac_size_decision()
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bs_t *s;
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} x264_cabac_t;
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/* encoder/decoder: init the contexts given i_slice_type, the quantif and the model */
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void x264_cabac_context_init( x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model );
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/* decoder only: */
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void x264_cabac_decode_init ( x264_cabac_t *cb, bs_t *s );
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int x264_cabac_decode_decision( x264_cabac_t *cb, int i_ctx_idx );
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int x264_cabac_decode_bypass ( x264_cabac_t *cb );
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int x264_cabac_decode_terminal( x264_cabac_t *cb );
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/* encoder only: */
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void x264_cabac_encode_init ( x264_cabac_t *cb, bs_t *s );
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void x264_cabac_encode_decision( x264_cabac_t *cb, int i_ctx_idx, int b );
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void x264_cabac_encode_bypass( x264_cabac_t *cb, int b );
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void x264_cabac_encode_terminal( x264_cabac_t *cb, int b );
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void x264_cabac_encode_flush( x264_cabac_t *cb );
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/* don't write the bitstream, just calculate cost: */
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void x264_cabac_size_decision( x264_cabac_t *cb, int i_ctx, int b );
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int x264_cabac_size_decision2( uint8_t *state, int b );
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int x264_cabac_size_decision_noup( uint8_t *state, int b );
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static inline int x264_cabac_pos( x264_cabac_t *cb )
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{
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return bs_pos( cb->s ) + cb->i_bits_outstanding;
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}
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#endif
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